Multidirectional switch device in which differences in tactile feel are reduced

[0002] 1. Field of the Invention

[0003] The present invention relates to a switch device, and, more particularly, to a switch device which is suitable for use in driving a mirror of an automobile.

[0004] 2. Description of the Related Art

[0005] The switch device is used for remotely controlling a mirror which is mounted to, for example, the body of an automobile from the driver's seat by the driving power of a motor. In addition, the switch device is used to selectively operate a plurality of switches which are disposed inside a case by pressing an operating section which is rockably stopped at the top portion of the case.

[0006] A description of a conventional switch device is given with reference to the relevant drawings.

[0007] FIG. 15 is an exploded perspective view of the conventional switch drive. FIG. 16 is a sectional view of the conventional switch device.

[0008] As shown in FIG. 15, the conventional switch device comprises a case 21 having an open bottom end and a cover 29 for covering the open end of the case 21. The case 21 and the cover 29 are snappingly coupled together, whereby the external shell of the switch device is formed.

[0009] A printed wiring board 28 is placed on the cover 29. The printed wiring board 28 has three stationary contacts 28aformed thereon. Three sliding members 25 are placed above the corresponding stationary contacts 28awhich are formed on the printed wiring board 28. The three sliding members 25 have corresponding movable contacts 27 formed thereon such that they come into contact with and separate from their corresponding stationary contacts 28aby sliding.

[0010] The three stationary contacts 28awhich are formed on the printed wiring board 28 and the three sliding members 25 which have the corresponding movable contacts 27 affixed thereto form three switches.

[0011] A substantially square recess 21ais formed in the top surface of the case 21. Clearance holes 21bare formed in three of the four corners of the recess 21a.

[0012] A protruding wall 21dhaving a through hole 21cis formed in the center of the recess 21a.

[0013] Three actuating members 22 are provided, each of which comprises a circular cylindrical base 22aand substantially semicircular ends 22bwhich are provided on both ends of its corresponding base 22a.

[0014] A rubber spring 23 comprises a flat, substantially rectangular base 23a, substantially dome-shaped spring sections 23b-1, 23b-2, 23b-3, and 23b-4, and planar presser sections 23c-1, 23c-2, 23c-3, and 23c-4. The spring sections 23b-1, 23b-2, 23b-3, and 23b-4 are formed on the four corners of the base 23a, respectively. The presser sections 23c-1, 23c-2, 23c-3, and 23c-4 have circular cylindrical shapes, are formed on ends of the corresponding spring sections 23b-1, 23b-2, 23b-3, and 23b-4, and have their ends formed parallel to the base 23a, that is, in a horizontal direction.

[0015] A rectangular through hole 23dis formed in the center of the base 23a. An inside wall 23eis formed on the base 23ain a standing manner so as to surround the peripheral. portion of the through hole 23d.

[0016] The rubber spring 23 is accommodated inside the recess 21aof the case 21. At this time, the actuating members 22 are in contact with the inside walls of the three corresponding presser sections 23c1, 23c-2, and 23c-3, and are disposed so as to be slidable inside their corresponding clearance holes 21bin the case 21. The through hole 23din the rubber spring 23 is disposed so as to oppose the through hole 21cin the case 21.

[0017] As shown in FIG. 16, an operating member 24 is formed of, for example, a synthetic resin material by molding. The operating member 24 comprises a substantially rectangular top wall 24a, side walls 24bwhich extend in a substantially vertical direction from the peripheral ends of the top wall 24aso as to surround the peripheral end portions of the top wall 24a, and four cylindrical actuating sections 24cwhich are cross-shaped in cross section and which protrude inwardly from the vicinity of the four corresponding corners of the top wall 24a.

[0018] An end surface of each actuating section 24cof the operating member 24 is formed with the same predetermined tilt angle α1 (such as, approximately three degrees) with respect to the top wall 24a(that is, the horizontal plane). Each end surface extends radially outward from substantially the center of the operating member 24.

[0019] A description of the operation of the switch device will now be given.

[0020] As shown in FIG. 15, when, for example, the operator presses substantially the center portion of the lower left end side of the operating member 24 shown in FIG. 15 with, for example, his/her finger (not shown), the operating member 24 tilts to the lower left side. When the operating member 24 tilts to the lower left side, the two left actuating sections 24cand 24cof the operating member 24 are pushed downward. When these two left actuating sections 24cand 24care pushed, the corresponding presser sections 23c1 and 23c2 of the rubber spring 23 which have been brought-into contact with the two left actuating sections 24cand 24care pushed downward.

[0021] When the presser sections 23c-1 and 23c-2 of the rubber spring 23 are pushed, each of the spring sections 23b-1 and 23b-2 buckles as the operator is provided with a tactile feel, so that the operator is provided with a proper tactile feel. At this time, the presser sections 23c-1 and 23c-2 cause the two actuating members 22 which are in contact with the inside walls of their corresponding presser sections 23c-1 and 23c-2 to be pushed and to slide downward.

[0022] When these two actuating members 22 slide downward, the ends 22bof each of these actuating members 22 move downward on inclined portions 25cof the two corresponding sliding members 25. Here, these two sliding members 25 slide, along with their corresponding movable contacts 27, above the corresponding stationary contacts 28awhich are formed on the printed wiring board 28 so as to go against the resilient forces of corresponding coil springs 26.

[0023] When these two sliding members 25 slide, each of the corresponding movable contacts 27 comes into contact with its corresponding stationary contact 28a, so that two switches are brought into an on state at the same time.

[0024] Next, when the operator moves his/her finger off the operating member 24, the resilient forces of the two corresponding coil springs 26 cause the two corresponding sliding members 25 to slide back to their original positions. Here, each of the corresponding movable contacts 27 separates from its corresponding stationary contact 28a, so that the two switches are brought-into an off state.

[0025] By the sliding of the two sliding members 25, the corresponding actuating members 22 are pushed upward, and the operating member 24 is pushed upward to its original position by the self-restoring force of the rubber spring 23.

[0026] As shown in FIG. 15, when the operator presses, for example, substantially the center portion of the upper left end side of the operating member 24 shown in FIG. 15 with, for example, his/her finger (not shown), the operating member 24 tilts to the upper left side. When the operating member 24 tilts to the upper left side, the corresponding actuating sections 24cof the operating member 24 are pushed downward. When the actuating sections 24care pushed downward, the presser sections 23c-1 and 23c-4 of the rubber spring 23 which have come into contact with the actuating sections 24care pushed downward.

[0027] The operations which follow the pushing down of the presser sections 23c-1 and 23c-4 are substantially the same as those when substantially the center portion of the lower left side of the operating member 24 is pressed, so that the details thereof will be omitted. However, since an actuating member 22 and a switch are not provided below the presser section 23c-4, the one switch which is disposed below the presser section 23c-1 is brought into an on state. Thereafter, the actuating member 22 disposed below the presser section 23c-1 returns to its original position by the restoring force of the rubber spring 23, so that the one switch is brought into an off state.

[0028] A description of the clicking characteristics which are provided during the operation of the switch device will be given.

[0029] FIG. 17 is a graph illustrating the clicking characteristic which is provided when two switches of the conventional switch device are actuated. FIG. 18 is a graph illustrating the clicking characteristic which is provided when one switch of the conventional switch device is actuated.

[0030] As shown in FIG. 17, when two switches are actuated by pushing, for example, the spring sections 23b-1 and 23b-2 at the same time as a result of pushing a predetermined location of the operating member 24 (see FIG. 15) of the conventional switch device, the clicking characteristic represented by graph C is obtained. Graph C represents the clicking characteristic in which the change in load which occurs when the corresponding spring sections buckle becomes small due to the actuating forces required to actuate two switches.

[0031] As shown in FIG. 18, when only one switch is actuated by pushing, for example, the spring section 23b-1 and the spring section 23b-4 at the same time as a result of pushing a predetermined location of the operating member 24 of the conventional switch device, the clicking characteristic represented by graph D is obtained. Graph D represents the clicking characteristic in which the change in load is greater than in Graph C because an actuating force for actuating only one switch is required.

[0032] As can be understood from the foregoing description, the conventional switch device exhibits the clicking characteristic shown in either graph C or graph D, so that a difference in the clicking characteristics occurs depending on the pressing location.

[0033] In the conventional switch device, either one or two switches are actuated depending on the pressing location (that is, the operating location) of the operating member. Therefore, the clicking characteristic which is provided when one switch is actuated and that which is provided when two switches are actuated are different, giving rise to the problem that the operator experiences a different tactile sense when operating the operating member.

[0034] Accordingly, in order to overcome the above-described problem, it is an object of the present invention to provide a switch device which is uniformly operable as a result of providing a uniform tactile feel regardless of the directions of pressing locations of an operating member which is operated by an operator with, for example, his/her finger.

[0035] According to the present invention, there is provided a switch device comprising a case, an operating member which is rockably supported by the case, a plurality of spring sections which are disposed inside the case, and a plurality of switches which are disposed inside the case. The operating member includes a plurality of actuating sections. The plurality of spring sections are actuated by the actuating sections. The plurality of switches are switched by the corresponding actuating sections. In the switch device, when the operating member is not operated, the actuating sections and the spring sections oppose each other with predetermined tilt angles in an outward direction of the operating member. The total number of switches is made less than the total number of spring sections so that one or more of the spring sections are provided along with the corresponding switch or switches and one or more of the spring sections are not provided along with a switch or switches. The tilt angle or the tilt angles which correspond to the spring section or the spring sections which are not provided along with a switch or switches are larger than the tilt angle or tilt angles which correspond to the spring section or the spring sections which are provided along with the corresponding switch or switches.

[0036] The tilt angle of an end of the actuating section which opposes the corresponding spring section which is provided along with the corresponding switch or the tilt angles of ends of the actuating sections which oppose the corresponding spring sections which are provided along with the corresponding switches may be set such that, when the operating member rocks, the operating member comes into close contact with an end of the corresponding spring section or ends of the corresponding spring sections at a substantially horizontal location the moment the spring section or spring sections buckle.

[0037] When the tilt angle or tilt angles are set as described above, the actuating sections may be resiliently biased by the spring sections, the operating member being stopped by the case by the resilient forces of the spring sections.

[0038] When the actuating sections are resiliently biased by the spring sections, and the operating member is stopped by the case by the resilient forces of the spring sections, four of the spring sections and three of the switches may be provided, and two of the four spring sections may be actuated at the same time by rocking the operating member.

[0039] When four of the spring sections and three of the switches are provided, and two of the four spring sections are actuated at the same time by rocking the operating member, each switch may comprise a printed wiring board disposed inside the case, a stationary contact which is formed on the printed wiring board corresponding thereto, a slider which slides above the printed wiring board corresponding thereto, and a movable contact which is disposed at its corresponding slider. Each slider may slide by its corresponding spring section in order to switch the corresponding switch.

[0040] FIG. 1 is an exploded perspective view of an embodiment of a switch device in accordance with the present invention.

[0041] FIG. 2 is a plan view of the embodiment of the switch device in accordance with the present invention.

[0042] FIG. 3 is an enlarged sectional view taken along line III—III of FIG. 2.

[0043] FIG. 4 is a plan view of an operating member of the embodiment of the switch device in accordance with the present invention.

[0044] FIG. 5 is a side view of the operating member of the embodiment of the switch device in accordance with the present invention.

[0045] FIG. 6 is a bottom view of the operating member of the embodiment of the switch device in accordance with the present invention.

[0046] FIG. 7 is a first diagram illustrative of the operating member of the embodiment of the switch device in accordance with the present invention.

[0047] FIG. 8 is a second diagram illustrative of the operating member of the embodiment of the switch device in accordance with the present invention.

[0048] FIG. 9 is an enlarged sectional view of the main portion of the embodiment of the switch device in accordance with the present invention.

[0049] FIG. 10 is a first diagram illustrative of the operation of the switch device in accordance with the present invention.

[0050] FIG. 11 is an enlarged sectional view of the main portion of the switch device in accordance with the present invention.

[0051] FIG. 12 is a second diagram illustrative of the operation of the switch device in accordance with the present invention.

[0052] FIG. 13 is a graph illustrating the clicking characteristic which is provided when two switches of the switch device of the present invention are actuated.

[0053] FIG. 14 is a graph illustrating the clicking characteristic which is provided when one switch of the switch device of the present invention is actuated.

[0054] FIG. 15 is an exploded perspective view of a conventional switch device.

[0055] FIG. 16 is an enlarged sectional view of the conventional switch device.

[0056] FIG. 17 is a graph illustrating the clicking characteristic which is provided when one switch of the conventional switch device is actuated.

[0057] FIG. 18 is a graph illustrating the clicking go characteristic which is provided when two switches of the conventional switch device are actuated.

[0058] A description of a switch device of the present invention will be given with reference to the relevant drawings.

[0059] FIG. 1 is an exploded perspective view of an embodiment of a switch device in accordance with the present invention. FIG. 2 is a plan view of the embodiment of the switch device in accordance with the present invention. FIG. 3 is an enlarged sectional view taken along line III—III of FIG. 2.

[0060] As shown in FIG. 1, a case 1 is formed of, for example, a synthetic resin material by molding, and is substantially box-shaped. The case 1 comprises a substantially rectangular top wall 1a, side walls 1bwhich extend vertically from near the outer peripheral end of the top wall 1aso as to surround all sides of the case 1, and a substantially rectangular recess 1cwhich is formed in the top wall 1a.

[0061] Circular clearance holes 1d, a rectangular through hole 1e, and a protruding wall If are formed at the recess 1c. The clearance holes 1dare formed near three of the four corners of the recess 1c. The through hole 1eis formed in the center of the recess 1c. The protruding wall if extends vertically into the recess 1cfrom the periphery of the through hole 1e.

[0062] Although not shown, the side of the case 1 opposing the top wall 1ais open.

[0063] Three actuating members 2 are formed of, for example, a synthetic resin material by molding. Each actuating member 2 comprises a circular cylindrical base 2aand semicircular ends 2bwhich are provided on both ends of its corresponding base 2a.

[0064] Each actuating member 2 is slidably disposed in its corresponding clearance hole 1din the case 1. Here, the ends 2bof each actuating member 2 are disposed so as to protrude outwardly from their corresponding clearance holes 1d.

[0065] A rubber spring 3 is formed of, for example, a resilient rubber material by molding. The rubber spring 3 comprises a flat, substantially rectangular base 3a, substantially dome-shaped first, second, third, and fourth spring sections 3b-1, 3b-2, 3b-3, and 3b-4, and planar first, second, third, and fourth presser sections 3c-1, 3c-2, 3c-3, and 3c-4. The first, second, third, and fourth spring sections 3b-1, 3b-2, 3b-3, and 3b-4 are provided at the four corners of the base 3a, respectively. The first, second, third, and fourth presser sections 3c-1, 3c-2, 3c-3, and 3c-4 have circular cylindrical shapes, are formed on ends of the corresponding first, second, third, and fourth spring sections 3b-1, 3b-2, 3b-3, and 3b-4, and have their ends formed parallel to the base 3a, that is, in a horizontal direction. A rectangular hole 3dis formed in the center of the base 3a. An inside wall 3eis formed on the base 3ain a standing manner so as to surround the hole 3d.

[0066] The rubber spring 3 is accommodated inside the recess 1cin the case 1. Here, the actuating members 2 are disposed in contact with the inside surfaces of the corresponding first, second, and third presser sections 3c-1, 3c-2, and 3c-3. The hole 3dof the rubber spring 3 is disposed so as to oppose a square hole 1eof the case 1.

[0067] As shown in FIGS. 4 to 6, an operating member 4 is formed of, for example, a synthetic resin material by molding. The operating member 4 comprises a substantially rectangular top wall 4a, side walls 4b, cylindrical first, second, third, and fourth actuating sections 4c-1, 4c-2, 4c-3, and 4c-4 which are cross-shaped in cross section, and two pairs of engaging members 4dwhich protrude inwardly from substantially the center portion of the top wall 4a. The side walls 4bextend substantially vertically from the peripheral end of the top wall 4aso as to surround the peripheral portion of the top wall 4a. The first, second, third, and fourth actuating sections 4c-1, 4c-2, 4c-3, and 4c-4 protrude inwardly from near the four corresponding corners of the top wall 4a.

[0068] An end of each of the first, second, third, fourth actuating sections 4c-1, 4c-2, 4c-3, and 4c-4 of the operating member 4 is formed with a predetermined tilt angle with respect to the top wall 4a, that is, a horizontal plane so as to extend radially outward from substantially the center of the operating member 4. Here, as shown in FIG. 7, the end of each of the first, second, third actuating sections 4c-1, 4c-2, and 4c-3 is formed with a first tilt angle α1 of, for example, approximately three degrees, while, as shown in FIG. 8, the end of the fourth actuating section 4c-4 is formed with a second tilt angle α2 (which is greater than α1) of, for example, approximately 19 degrees. As a result, with an angle of α1, the end of each of the first, second, and third actuating sections 4c-1, 4c-2, and 4c-3 oppose their corresponding first, second, and third presser sections 3c-1, 3c-2, and 3c-3. On the other hand, with an angle of α2, the end of the fourth actuating section 4c-4 opposes the fourth presser section 3c-4.

[0069] The operating member 4 is disposed inside the recess 1cso as to virtually cover the open end of the recess 1cof the case 1. At this time, the ends of the first, second, third, and fourth actuating sections 4c-1, 4c-2, 4c-3, and 4c-4 are in contact with flat ends of the first, second, third, and fourth presser sections 3c-1, 3c-2, 3c-3, and 3c-4 of the rubber spring 3, respectively. When the first, second, third, and fourth presser sections 3c-1, 3c-2, 3c-3, and 3c-4 are in contact with their corresponding first, second, third, and fourth actuating sections 4c-1, 4c-2, 4c-3, and 4c-4, the operating member 4 remains pushed outward (that is, resiliently biased outward) from the case 1.

[0070] Here, the two pairs of engaging members 4dof the operating member 4 are engaged with the peripheral wall of the square hole 1eformed at the recess 1cby a suitable means, such as a snapping-in method. By the engagement of the two pairs of engaging members 4dwith the peripheral wall of the square hole 1e, the operating member 4 is constructed so that it is not dislodged from the case 1, and so that it is rockably disposed inside the recess 1c.

[0071] A plurality of sliding members 5 are provided, each of which comprising a substantially wedge-shaped base 5a, a recess 5bwhich is formed in the top surface of the corresponding base 5a, and an inclined section 5cwhich is formed at one end of the corresponding base 5a.

[0072] For example, three sliding members 5 are slidably accommodated inside the case 1. The ends 2bof each actuating member 2 is in contact with its corresponding inclined section 5c.

[0073] Coil springs 6 are formed of a metallic material into spiral forms with predetermined diameters. One end of each coil spring 6 is accommodated inside the recess 5bof its corresponding sliding member 5, whereas the other end of each coil spring 6 is in contact with the case 1. By the coil springs 6, the corresponding sliding members 5 are resiliently biased to one side.

[0074] Movable contacts 7 are formed of a metallic material, such as phosphor bronze, by a pressing operation, and comprise a plurality of sliding elements 7a. The movable contacts 7 are affixed to the corresponding sliding members 5 by a suitable means, such as thermal caulking, so that the movable contacts 7 slide as their corresponding sliding members 5 slide.

[0075] A printed wiring board 8 comprises a plurality of stationary contacts (such as three stationary contacts) 8awhich are formed on one surface thereof, a light-emitting element 8b, and a plurality of solder lands 8c.

[0076] The printed wiring board 8 is disposed inside the case 1.

[0077] The sliding members 5 having the corresponding movable contacts 7 affixed thereto are disposed above the printed wiring board 8 at locations which allow the movable contacts 7 to come into contact with and separate from their corresponding stationary contacts 8a. The sliding members 5 are formed such that, when they slide, the corresponding movable contacts 7 slide above their corresponding stationary contacts 8aso as to come into contact with and separate from their corresponding stationary contacts 8a.

[0078] Here, the stationary contacts 8aand their corresponding sliding members 5 having the corresponding movable contacts 7 affixed thereto form what are called switches. The switches are constructed only at locations which oppose their corresponding first, second, and third presser sections 3c-1, 3c-2, and 3c-3 of the rubber spring 3. Each of the switches is actuated by its corresponding actuating member 2.

[0079] A cover 9 is formed of, for example, a synthetic resin material by molding. The cover 9 comprises a substantially rectangular wall 9a, side walls 9awhich extend substantially vertically from the peripheral edge of the wall 9a, and a plurality of terminals 9cwhich are formed integrally with the wall 9aby insert molding on the wall 9a. The printed wiring board 8 is disposed on the wall 9aof the cover 9 with the terminals 9cbeing disposed so as to pass through their corresponding solder lands 8c. Here, the solder lands 8cand the terminals 9care soldered together, whereby the printed wiring board 8 and the cover 9 are integrally formed.

[0080] The cover 9 which is formed integrally with the printed wiring board 8 is disposed so as to cover the open portion (not shown) of the case 1. The case 1 and the cover 9 are engaged together by a suitable means, such as a snapping-in connecting operation.

[0081] A description of the operation of the switch device of the present invention will now be given.

[0082] First, as shown in FIG. 1, when the operator presses, for example, substantially the center portion of the lower left end side of the operating member 4 shown in FIG. 1 with, for example, his/her finger (not shown), the operating member 4 tilts to the left side. When the operating member 4 tilts to the left side, the first and second actuating sections 4c-1 and 4c-2 of the operating member 4 are pushed downward. When the first and second actuating sections 4c-1 and 4c-2 are pushed downward, the first and second presser sections 3c-1 and 3c-2 of the rubber spring 3 which have been brought into contact with their corresponding first and second actuating sections 4c-1 and 4c-2 are pushed downward.

[0083] When the first and second presser sections 3c-1 and 3c-2 of the rubber spring 3 are pushed, the first and second spring sections 3b-1 and 3b-2 are buckled as the operator is provided with a tactile feel, so that the operator is provided with a suitable tactile feel. Here, the first and second presser sections 3c-1 and 3c-2 cause the two actuating members 2 which are in contact with the inside walls of their corresponding first and second presser sections 3c-1 and 3c-2 to be pushed and to slide downward.

[0084] When the two actuating members 2 slide downward, the ends 2bof each of the two actuating members 2 move downward on the inclined sections 5cof the two corresponding sliding members 5. At this time, the two sliding members 5 slide, along with their corresponding movable contacts 7, above their corresponding stationary contacts 8awhich are formed on the printed wiring board 8 so as to go against the resilient forces of the corresponding coil springs 6.

[0085] When these two sliding members 5 slide, the corresponding movable contacts 7 come into contact with their corresponding stationary contacts 8a, so that two switches are brought into an on state at the same time.

[0086] Next, when the operator moves his/her finger off the operating member 4, the resilient forces of the two coil springs 6 cause the two corresponding sliding members 5 to slide back to their original positions. Here, the two movable contacts 7 separate from their corresponding stationary contacts 8a, so that the two switches are brought into an off state.

[0087] By the sliding of the two sliding members 5, the corresponding actuating members 2 are pushed upward, and the operating member 4 is pushed upward to its original position by the self-restoring force of the rubber spring 3.

[0088] As shown in FIG. 1, when the operator presses, for example, substantially the center portion of the upper left end side of the operating member 4 shown in FIG. 1 with, for example, his/her finger (not shown), the operating member 4 tilts to the left side. When the operating member 4 tilts to the left side, the first and fourth actuating sections 4c-1 and 4c-4 of the operating member 4 are pushed downward. When the first and fourth actuating sections 4c-1 and 4c-4 are pushed downward, the first and fourth presser sections 3c-1 and 3c-4 of the rubber spring 3 which have been brought into contact with the corresponding first and fourth actuating sections 4c-1 and 4c-4 are pushed downward.

[0089] When the first and fourth presser sections 3c-1 and 3c4 of the rubber spring 3 are pushed, the first and fourth spring sections 3b-1 and 3b-4 are buckled as the operator is provided with a tactile feel, so that the operator is provided with a suitable tactile feel. At this time, as shown in FIG. 10, the end of the first presser section 3c-1 moves to a location which is substantially parallel to the base 3a, while, as shown in FIG. 12, the end of the fourth presser section 3c-4 moves to a location which is at a predetermined angle from a location which is parallel to the base 3a. By virtue of these movements, the change in load of the tactile feel which is provided by the fourth spring section 3b-4 is somewhat smaller than that of the tactile feel which is provided by the first presser section 3c-1 which moves to a location which is substantially parallel to the base 3a.

[0090] Here, the first presser section 3c-1 causes the one actuating member 2 which is in contact with the inside wall of the first presser section 3c-1 to be pushed and to slide downward. When the one actuating member 2 slides downward, the ends 2bof the one actuating member 2 move downward on the inclined section 5cof the one sliding member 5 corresponding thereto. At this time, the one-sliding member 5 slides, along with the corresponding movable contact 7, above the corresponding stationary contact 8awhich is formed on the printed wiring board 8 so as to go against the resilient force of the corresponding coil spring 6.

[0091] When the one sliding member 5 slides, the corresponding movable contact 7 comes into contact with the corresponding stationary contact 8a, so that the corresponding one switch is brought into an on state.

[0092] As described above, even if switches are disposed in correspondence with the spring sections, that is, the first and fourth spring sections 3b-1 and 3b-4 which provide corresponding tactile feels, or even if these switches are not disposed, the operator can experience substantially the same tactile feel. Therefore, although only one switch is being turned on, the clicking characteristic is substantially the same as the clicking characteristic which is provided when two switches are turned on.

[0093] Next, when the operator moves his/her finger off the operating member 4, the resilient force of the corresponding one coil spring 6 causes the corresponding one sliding member 5 to slide back to its original position. Here, the corresponding movable contact 7 separates from its corresponding stationary contact 8a, so that the one switch is brought into an off state.

[0094] By the sliding of the one sliding member 5, the corresponding actuating member 2 is pushed upward, and the operating member 4 is pushed upward to its original position by the self-restoring force of the rubber spring 3.

[0095] Thereafter, when the operator presses, for example, substantially the center portion of the lower right end side of the operating member 4 shown in FIG. 1 with, for example, his/her finger (not shown), the operating member 4 operates similarly to the case where the lower left end side of the operating member 4 is pressed, so that two switches are brought into an on state at the same time.

[0096] Next, when the operator presses, for example, substantially the center portion of the upper right end side of the operating member 4 shown in FIG. 1 with, for example, his/her finger (not shown), operations which are similar to those which are executed when the upper left end side of the operating member 4 is pressed are executed, causing one switch to be brought into an on state.

[0097] Accordingly, based on the direction of operation when any of the four pressing locations of the rectangular operating member 4 are operated, a determination is unambiguously made as to the location of the switch or the locations of the switches to be turned on or the number of switches to be turned on. Consequently, a determination is made as to which location (that is, the upper lower, left, or right side) of the pressing portion of the operating member 4 is operated.

[0098] A description of the clicking characteristics in the operation of the switch device will now be given.

[0099] FIG. 13 is a graph illustrating the clicking characteristic which is provided when two switches are actuated as a result of pressing substantially the center portion of the lower left end of the operating member in the switch device of the present invention shown in FIG. 1. FIG. 14 is a graph illustrating the clicking characteristic which is provided when one switch is actuated as a result of pressing substantially the center portion of the upper left end of the operating member in the switch device of the present invention shown in FIG. 1.

[0100] The clicking characteristic which is obtained when two switches are actuated is represented by graph A shown in FIG. 13. The clicking characteristic is such that the difference between the peak value and the bottom value is somewhat small because the tactile feel which is produced by the buckling of two spring sections of the rubber spring 3 is diminished as a result of the operation of two switches which are actuated by the operation of the operating member 4.

[0101] The clicking characteristic which is obtained when one switch is actuated is represented by graph B shown in FIG. 14. The clicking characteristic is such that the difference between the peak value and the bottom value is somewhat small. To obtain this clicking characteristic, only one switch is operated by the operation of the operating member 4, so that the tactile feel which is produced by the buckling of two spring sections of the rubber spring 3 is diminished by an amount corresponding to the operation of only one switch. An end of the fourth actuating section 4c-4 of the operating member 4 is formed with a tilt angle of α2. The end of the fourth actuating section 4c-4 pushes an end of the fourth presser section 3c-4 which is formed on the fourth spring section 3b-4, so that the end of the fourth presser section 3c-4 moves with respect to the base 3awith a tilt angle. Therefore, the rubber spring 3 cannot buckle smoothly, thereby producing this clicking characteristic. The clicking characteristic which is represented by graph B is substantially the same as that which is represented by graph A.

[0102] Although, in the above-described switch device, the actuating sections of the operating member 4 have inclined surfaces with different tilt angles, the present invention is not limited thereto, so that it is obvious that, for example, the presser sections of the rubber spring may have inclined surfaces with different tilt angles.

[0103] As can be understood from the foregoing description, in the switch device of the present invention, the operating member comprises a plurality of actuating sections, opposing their corresponding spring sections, for operating the corresponding spring sections. The switches are switched by actuating the spring sections. The ends of the actuating sections which oppose the spring sections are inclined in the outward direction of the operating member. The tilt angle of the actuating section which opposes the spring section which is not provided along with a switch is greater than the tilt angles of the actuating sections which oppose the corresponding spring sections which are provided along with the corresponding switches. Therefore, it is possible to provide a switch device in which the tactile feel which is provided by operating the spring section which is not provided along with a switch and the tactile feel which is provided by operating the spring sections which are provided along with the corresponding switches are substantially the same.

[0104] According to the switch device of the present invention, there may be four spring sections and three switches. Here, when the operating member rocks, two spring sections are actuated at the same time. Therefore, it is possible to provide a low-cost switch device which can determine which of the four operating locations of the operating member which are provided in four corresponding directions is operated using three switches because a determination is made as to which switch or switches are turned on.

[0105] According to the switch device of the present invention, the tilt angles of ends of the actuating sections which oppose the spring sections which are provided along with the corresponding switches are set such that, when the operating member rocks, it comes into close contact with ends of the spring sections in a parallel arrangement. Therefore, it is possible to provide a switch device which allows an operator to be provided with a more suitable tactile feel.

[0106] According to the switch device of the present invention, the actuating sections are resiliently biased by their corresponding spring sections. By the resilient biasing forces, the operating member is stopped by the case. Therefore, it is possible to provide a low-cost switch device which makes it possible to easily engage the operating member to the case, and which can be assembled easily.

[0107] According to the switch device of the present invention, each switch comprises a common printed wiring board which is disposed inside the case, a stationary contact which is formed on the common printed wiring board, a slider which slides above the common printed wiring board, and a movable contact which is disposed on its corresponding slider. Each slider slides by its corresponding spring section in order to switch its corresponding switch. Therefore, it is possible to provide a switch device which is low in cost because the switches which are formed therein are less expensive than a single switch which is accommodated in a housing.