JP4892435B2 - Movable contact unit for switch and switch device using the same - Google Patents

Description

  The present invention uses a movable contact unit for a switch that is incorporated in a switch device including a plurality of switch elements that are individually pressed and driven by a plurality of operation keys to illuminate the group of operation keys, and the switch illumination member. And switch device.

In recent years, a light source is attached to one end of a light guide plate made of a light-transmitting resin having flexibility as an input unit of a mobile phone or the like, and this light guide plate is placed on a substrate so as to cover a switch element group. By connecting the light source to the substrate, each operation key can be driven to drive the movable contact of each switch element toward the fixed contact via the light guide plate, and is introduced into the light guide plate from one side edge. There has been proposed a switch device with an illumination function in which light from a light source is refracted by an illumination part of a light guide plate and projected onto the bottom surface of an operation key (see, for example, Patent Document 1). When a flexible light guide plate capable of introducing light from a light source from one side end portion is used as described above, the number of light sources can be greatly reduced, so that manufacturing cost and power consumption can be reduced.
JP 2001-167655 A (page 3-4, FIG. 1)

  However, in the prior art disclosed in Patent Document 1, the work of distributing and arranging a plurality of movable contacts on a substrate and the work of attaching a light source to one end of a flexible light guide plate are complicated. Even when the light guide plate is placed on the substrate, a complicated operation for electrically connecting the light source to the substrate is required, and there is a problem that the assembling workability is poor.

  In order to improve the assembly workability, the present inventors hold a plurality of movable contacts with a flexible sheet and place the flexible sheet on the substrate so that the group of movable contacts can be integrated. A switch device having a structure in which a light source is mounted on the substrate and light from the light source is incident on a side end surface of a flexible light guide plate laminated on the flexible sheet. It was investigated. However, when a flexible light guide plate is laminated on the flexible sheet, both are brought into close contact with each other, so that light introduced from the side end surface into the light guide plate leaks into the flexible sheet and is easily diffusely reflected. As a result, an undesired location near the operation key is illuminated, or another problem occurs, such as uneven illumination due to insufficient light quantity of the operation key far from the light source due to the loss of light accompanying it. found.

  As in the prior art disclosed in Patent Document 1, each operation key pushes and deflects the flexible light guide plate so that the movable contact of each switch element is driven toward the fixed contact. In the switch device having such a structure, there is another problem that the switch element is liable to malfunction when the operation key is pressed. In other words, the operation key that is tilted when pushed to the end pushes the light guide plate diagonally, so that the position where the light guide plate pushes the movable contact of the switch element is slightly shifted. For example, a dome-shaped reversing spring is used as the movable contact. In the case of the switch element, the pressing operation force is applied to a position off the central portion of the movable contact, and the possibility that the movable contact does not operate normally increases.

  The present invention has been made in view of such a state of the art, and a first object of the present invention is that the assembly workability is good and it is difficult to cause uneven illumination and undesired illumination, and operation keys. An object of the present invention is to provide a movable contact unit for a switch that can prevent a malfunction of a switch element even if the switch is pressed. A second object of the present invention is to provide a switch device using such a switch movable contact unit.

  In order to achieve the first object, a movable contact unit for a switch according to the present invention is provided between a light source and a substrate on which a plurality of switch elements are disposed and a plurality of operation keys capable of pressing and driving the switch element group. A movable switch for use, comprising a flexible sheet interposed between the movable contacts of the switch element group on one side and a flexible light guide laminated on the other side of the flexible sheet. An adhesion prevention sheet, which is a contact unit, in which a large number of fine irregularities are formed only on the surface facing the flexible light guide between the flexible sheet and the flexible light guide. A plurality of protrusions capable of individually pressing a predetermined position of each of the movable contact groups is provided on one of the opposing surfaces of the flexible sheet and the adhesion preventing sheet, and the operation key is the protrusion. Via the corresponding movable contact Configured as writing.

  In the switch movable contact unit configured as described above, the light source may be mounted on the substrate, so that the assembly workability is better than the structure in which the light source is attached to the flexible light guide plate and then connected to the substrate. Moreover, since the light emitting part of the light source is opposed to the side end face of the flexible light guide plate in the proximity state, the number of light sources can be greatly reduced, and the manufacturing cost and power consumption can be reduced. In addition, by attaching the movable contacts of the switch element group to the flexible sheet on which the flexible light guide is laminated, the movable contacts can be collectively disposed on the substrate, and the flexible conductor can be arranged. Since it becomes easy to arrange | position a light body with high positional accuracy with respect to a movable contact group, it becomes possible to improve assembly workability | operativity further. Furthermore, an adhesion prevention sheet is interposed between the flexible sheet and the flexible light guide, and the non-adhesion surface on which many fine irregularities of the adhesion prevention sheet are formed is attached to the flexible light guide. The light introduced into the flexible light guide is less likely to leak into the flexible sheet because it is not in close contact with the light guide. Therefore, uneven illumination and undesired spots caused by the light irregularly reflected in the flexible sheet. Can be suppressed. In addition, a plurality of protrusions capable of individually pressing the predetermined positions of the movable contact groups are provided on the smooth opposing surface of the flexible sheet or the adhesion preventing sheet, and the operation keys that have been pressed are interposed through the protrusions. Since the corresponding movable contact is pushed in, even when the operation key is pushed, the pressing operation force is always applied to the predetermined position of the movable contact by the protrusion, and therefore the movable contact of the movable contact is pressed during the pressing operation. There is no possibility that an undesired portion is pushed in, and malfunction can be effectively prevented.

  In the switch movable contact unit having the above-described configuration, when the projection group is provided on the flexible sheet and the plurality of through holes for individually penetrating the projection group are provided on the adhesion prevention sheet, Since the flexible light guide can be directly placed, the height dimension can be reduced by the thickness of the adhesion preventing sheet.

  In order to achieve the second object described above, a switch device of the present invention includes a light source mounted on a substrate, a plurality of fixed contacts provided on the substrate, and a plurality of movable contacts that can be contacted and separated from these fixed contacts. A contact sheet, a flexible sheet that holds the movable contacts on one surface, and a predetermined area where the movable contact group does not exist is fixed on the substrate, and a plurality of operation keys capable of individually pressing and driving the movable contact group And a flexible light guide laminated on the other surface of the flexible sheet via an adhesion prevention sheet, and the adhesion prevention sheet has a surface on the side facing the flexible light guide. Only a plurality of fine irregularities are formed, and provided with a plurality of protrusions capable of individually pressing a predetermined position of each of the movable contact groups on either one of the opposing surfaces of the flexible sheet and the adhesion preventing sheet, The movable key corresponding to the operation key via the protrusion It was configured to push the point.

  In the switch device configured as described above, since the light source may be mounted on the substrate, the assembly workability becomes better than the structure in which the light source is attached to the flexible light guide plate and then connected to the substrate. Since the light emitting part of the light source is opposed to the side end face of the flexible light guide plate in the proximity state, the number of light sources can be greatly reduced, and the manufacturing cost and power consumption can be reduced. In addition, since the movable contact group is held on the flexible sheet on which the flexible light guide is laminated, the movable contacts can be collectively arranged on the substrate, and the flexible light guide Can be easily arranged with high positional accuracy with respect to the movable contact group, and assembling workability can be further improved. Further, an adhesion prevention sheet is interposed between the flexible sheet and the flexible light guide, and the non-adhesion surface on which a large number of fine irregularities of the adhesion prevention sheet are formed is attached to the flexible light guide. The light introduced into the flexible light guide is less likely to leak into the flexible sheet because it is not in close contact with the light guide. Can be suppressed. In addition, a plurality of protrusions capable of individually pressing the predetermined positions of the movable contact groups are provided on the smooth opposing surface of the flexible sheet or the adhesion preventing sheet, and the operation keys that have been pressed are interposed through the protrusions. Since the corresponding movable contact is pushed in, even when the operation key is pushed, the pressing operation force is always applied to the predetermined position of the movable contact by the protrusion, and therefore the movable contact of the movable contact is pressed during the pressing operation. There is no possibility that an undesired portion is pushed in, and malfunction can be effectively prevented.

  In the switch device having the above-described configuration, when the projection group is provided on the flexible sheet, and the plurality of through holes that individually penetrate the projection group are provided in the adhesion prevention sheet, the flexibility is provided on the projection. Since the light guide can be placed directly, the height dimension can be reduced by the thickness of the adhesion prevention sheet.

  Since the switch movable contact unit of the present invention only has to mount the light source on the substrate, the assembly workability becomes better than the structure in which the light source is attached to the flexible light guide plate and then connected to the substrate. Since the light emitting part of the light source is opposed to the side end face of the flexible light guide plate in the proximity state, the number of light sources can be greatly reduced, and the manufacturing cost and power consumption can be reduced. In addition, by attaching the movable contacts of the switch element group to the flexible sheet on which the flexible light guide is laminated, the movable contacts can be collectively disposed on the substrate, and the flexible conductor can be arranged. Since it becomes easy to arrange | position a light body with high positional accuracy with respect to a movable contact group, it becomes possible to improve assembly workability | operativity further. Further, an adhesion prevention sheet is interposed between the flexible sheet and the flexible light guide, and the non-adhesion surface on which a large number of fine irregularities of the adhesion prevention sheet are formed is attached to the flexible light guide. The light introduced into the flexible light guide is less likely to leak into the flexible sheet because it is not in close contact with the light guide. Can be suppressed. In addition, a plurality of protrusions capable of individually pressing the predetermined positions of the movable contact groups are provided on the smooth opposing surface of the flexible sheet or the adhesion preventing sheet, and the operation keys that have been pressed are interposed through the protrusions. Since the corresponding movable contact is pushed in, even when the operation key is pushed, the pressing operation force is always applied to the predetermined position of the movable contact by the protrusion, and therefore the movable contact of the movable contact is pressed during the pressing operation. There is no possibility that an undesired portion is pushed in, and malfunction can be effectively prevented.

  Since the switch device of the present invention only needs to mount the light source on the substrate, the assembling workability is better than the structure in which the light source is attached to the flexible light guide plate and then connected to the substrate. Since the light emitting portion of the light source is opposed to the side end face of the light guide plate in the proximity state, the number of light sources can be greatly reduced, and the manufacturing cost and power consumption can be reduced. In addition, since the movable contact group is held on the flexible sheet on which the flexible light guide is laminated, the movable contacts can be collectively arranged on the substrate, and the flexible light guide Can be easily arranged with high positional accuracy with respect to the movable contact group, and assembling workability can be further improved. Further, an adhesion prevention sheet is interposed between the flexible sheet and the flexible light guide, and the non-adhesion surface on which a large number of fine irregularities of the adhesion prevention sheet are formed is attached to the flexible light guide. The light introduced into the flexible light guide is less likely to leak into the flexible sheet because it is not in close contact with the light guide. Can be suppressed. In addition, the smooth opposing surface of the flexible sheet or the adhesion prevention sheet is provided with a plurality of protrusions that can individually press the predetermined positions of the movable contact groups, and the operation keys that are pressed correspond to the protrusions via the protrusions. Therefore, even when the operation key is pressed, the pressing force is always applied to the predetermined position of the movable contact by the protrusion. There is no possibility that the desired portion is pushed in, and malfunction can be effectively prevented.

  BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an essential part of a switch device according to a first embodiment of the present invention, and FIG. 2 is a plan view showing the switch device with a lid case omitted. FIG.

  The switch device shown in these drawings includes a substrate 1 on which the LED 2 is mounted, a plurality of operation keys 3 disposed in the opening 4a of the lid case 4, a sheet member 5 with a contact placed on the substrate 1, It is mainly comprised by the flexible light-guide plate 6 laminated | stacked through the contact | adherence prevention sheet | seat 12 on this sheet | seat member 5 with a contact. A fixed contact 7 and a common contact 8 are disposed below the operation keys 3 on the upper surface of the substrate 1, and both the contacts 7 and 8 are exposed with a predetermined interval. Further, the substrate 1 is provided with a wiring pattern, a through hole (not shown) derived from the fixed contact 7 and the common contact 8. The LED 2 is a light source for illuminating each operation key 3 in a dark place, and the light emitting portion 2a of the LED 2 faces the central portion of the side end surface 6a along one side end of the flexible light guide plate 6 in a close state. . Thereby, the light emitted from the LED 2 light emitting unit 2 a and introduced into the flexible light guide plate 6 is projected onto the bottom surface of the operation key 3 through the illumination unit 6 b of the light guide plate 6. .

  The contact-attached sheet member 5 includes a plurality of movable contacts 9 that can be individually contacted and separated from the fixed contact 7 group, a flexible sheet 10 that holds the movable contact 9 group at a plurality of positions on the lower surface, and a flexible sheet. It is comprised by the fixing | fixed part 11 which is the adhesive sheet adhere | attached on the area | region where the movable contact 9 group does not exist among the lower surfaces of 10. FIG. On the smooth upper surface of the flexible sheet 10, upward projections 10a are projected at a plurality of locations holding the movable contact 9 group, and the pressing operation force of the operation key 3 is downward through the projections 10a. The movable contact 9 is provided. These protrusions 10a are formed in advance using a dispenser or the like on a smooth surface, which is the upper surface of the flexible sheet 10, so that each protrusion 10a is positioned directly above the center of the corresponding movable contact 9. Is set. The contact-attached sheet member 5 is fixed on the substrate 1 by an adhesive layer 11a of a fixing part (adhesive sheet) 11, but a release sheet (not shown) is attached to the adhesive layer 11a of the fixing part 11 during storage or transportation. Then, the space where the movable contact 9 exists is closed, and the release sheet is peeled off to expose the adhesive layer 11a when the sheet member with contact 5 is placed and fixed on the substrate 1.

  The movable contact 9 is formed of a metal leaf spring that is formed in a dome shape and generates a click feeling when reversed, and its upper surface is bonded to the lower surface of the flexible sheet 10. When the flexible sheet 10 is placed and fixed at a predetermined position on the substrate 1, the peripheral portion of the movable contact 9 is pressed against the common contact 8 as shown in FIG. 1, and the central portion of the movable contact 9 is fixed. It faces the contact 7 so as to be able to contact and separate. As a result, switch elements having contact points 7.9 that can be contacted and separated are disposed at a plurality of locations on the substrate 1.

  The flexible light guide plate 6 is formed by molding a flexible material having excellent translucency such as urethane or silicon into a sheet shape. On the upper surface of the flexible light guide plate 6, an illumination unit 6 b for refracting the light traveling through the light guide plate 6 and projecting it upward is provided at a location facing the bottom surface of the operation key 3. Moreover, the center part of the side end surface 6a of the flexible light-guide plate 6 is the light-incidence part 6c into which the light from LED2 injects. A thin adhesion preventing sheet 12 is interposed between the flexible light guide plate 6 and the flexible sheet 10. The upper surface (surface on the side facing the flexible light guide 6) of the adhesion prevention sheet 12 is a non-adhesion surface on which a large number of minute irregularities are formed. Is prevented from leaking from the flexible light guide plate 6 into the flexible sheet 10. However, the lower surface (surface on the side facing the flexible sheet 10) of the adhesion prevention sheet 12 is a smooth surface without forming irregularities. As shown in FIG. 2, the four corners of the flexible light guide plate 6 and the two places in the vicinity of the light incident portion 6 c serve as attachment portions 6 d that are bonded to the upper surface of the flexible sheet 10 via the adhesion prevention sheet 12. Yes. These attachment portions 6d are portions where the flexible light guide plate 6 is fixed to the substrate 1 via the sheet member 5 with a contact, and as shown in FIG. 1, the adhesion preventing sheet 12 is located at a location facing the attachment portion 6d. The upper and lower surfaces are bonded to the flexible light guide plate 6 and the flexible sheet 10 with an adhesive 13. Thus, when the flexible light guide plate 6 is placed and fixed on the flexible sheet 10 via the adhesion preventing sheet 12, the respective illumination portions 6 b are arranged immediately above the respective movable contacts 9. . However, as shown in FIG. 2, consideration is given so that the position of the mounting portion 6 d on the side end face 6 a side does not fall within the range of the light emission angle of the LED 2.

  In this embodiment, a semi-finished product in which the flexible light guide plate 6 and the adhesion preventing sheet 12 are assembled on the sheet member with contact 5 in advance is prepared, and the sheet member with contact 5 in the state of this semi-finished product The flexible light guide plate 6 is placed and fixed on the substrate 1 together. Further, positioning holes 6f (adhesion prevention sheet 12 and contact-attached sheet member) for defining mounting positions with respect to the substrate 1 are provided at two locations corresponding to the flexible light guide plate 6, the adhesion prevention sheet 12 and the contact-attached sheet member 5. 5 is formed), and the flexible light guide plate 6, the adhesion preventing sheet 12, and the sheet member 5 with a contact are stacked on the basis of the positioning hole to arrange the movable contact 9 group. Has also been determined.

  The operation key 3 is mounted on the illuminating portion 6 b of the flexible light guide plate 6 placed on the substrate 1 so as to be movable up and down, and is prevented from being removed by the lid case 4. Although not shown, a light emitting portion on which characters, symbols, and the like are printed is provided on the upper surface of the operation key 3, and the light emitting portion emits light by the light of the illumination portion 6b projected from the bottom surface side. ing.

  Next, the operation of the switch device configured as described above will be described. When the user pushes the desired operation key 3 downward, the flexible light guide plate 6 and the adhesion preventing sheet 12 are pushed and bent in the lower region of the operation key 3 and the flexible sheet 10 is provided via the protrusion 10a. Therefore, when the operation key 3 is lowered by a predetermined stroke, the central portion of the movable contact 9 is reversed and comes into contact with the fixed contact 7. As a result, the fixed contact 7 and the common contact 8 are brought into conduction via the movable contact 9 and switched to the switch-on state. In addition, since a click feeling is generated when the movable contact 9 is reversed, the user can feel that the pressing operation has been reliably performed by the click feeling. When the pressing operation force on the operation key 3 is removed, the movable contact 9 returns to its original dome shape by its own elasticity, and the flexible light guide plate 6, the adhesion preventing sheet 12, and the flexible sheet 10 are also bent. Therefore, the operation key 3 is pushed up to the initial position.

  As described above, in the present embodiment, the LED 2 as the light source is mounted on the substrate 1 and the light emitting portion 2a of the LED 2 is opposed to the side end face 6a of the flexible light guide plate 6, Light can be efficiently projected from each illumination portion 6 b of the flexible light guide plate 6 toward the bottom surface of each operation key 3. Therefore, not only can the number of light sources be greatly reduced to reduce the manufacturing cost and power consumption, but also the assembly workability compared to the structure in which the light sources are connected to the substrate after being attached to the flexible light guide plate. Becomes better.

  In this embodiment, the sheet member 5 with a contact formed by holding the movable contact 9 group on the lower surface of the flexible sheet 10 is used, and the flexible light guide plate 6 is provided on the sheet member 5 with the contact. Since the semi-finished product is assembled and fixed on the substrate 1, the movable contact 9 group can be collectively disposed on the substrate 1, and the flexible light guide plate 6 is used as the movable contact 9 group. On the other hand, it is easy to arrange with high positional accuracy, and therefore the assembly workability is very good. Moreover, since the adhesive layer 11a to which the release sheet is detachably attached is provided on the fixing portion 11 of the contact-attached sheet member 5, the release sheet is attached to the contact-attached sheet member 5 during storage or transportation. The adhesive layer 11 a of the fixing portion 11 may be fixed to the substrate 1 by peeling off the release sheet when assembled on the substrate 1. Therefore, this semi-finished product is very easy to handle and can be stored and transported without any problems.

  In the present embodiment, the upper surface of the adhesion preventing sheet 12 interposed between the flexible light guide plate 6 and the flexible sheet 10 (the surface on the side facing the flexible light guide 6). ) Is a non-contact surface on which a large number of minute irregularities are formed, and the non-contact surface prevents the close contact with the flexible light guide plate 6, so that it is introduced into the flexible light guide 6. There is little possibility that the light from the LED 2 leaks into the flexible sheet 10. Therefore, an undesired portion near the operation key 3 is illuminated by irregular reflection in the flexible sheet 10, or the amount of light of the operation key 3 far from the LED 2 is insufficient due to the accompanying light loss, resulting in uneven illumination. Such a problem is less likely to occur.

  Further, in the present embodiment example, the protrusions 10a are provided at a plurality of positions corresponding to the smooth upper surface of the flexible sheet 10 and directly above the central portion of each movable contact 9, and the operation key 3 that has been pressed is provided. Since the corresponding movable contact 9 is always pushed in via the lower projection 10a, the central portion of the movable contact 9 is always pushed in during the pressing operation. Therefore, even when the operation key 3 is pushed and the projection 10a is pushed obliquely from above, the pressing operation force is always applied to the central portion of the movable contact 9, and therefore the movable contact 9 at the time of the pressing operation. Can be remarkably stabilized and malfunction can be effectively prevented.

  In the present embodiment, the flexible light guide plate 6 and the sheet member with contact 5 are provided with positioning holes 6f for defining the mounting position with respect to the substrate 1, so that the positioning is performed at the time of mounting. By inserting the positioning pins into the holes 6f and the like, the flexible light guide plate 6 and the contact-attached sheet member 5 can be assembled to the substrate 1 easily and with high accuracy.

  FIG. 3 is a cross-sectional view of an essential part of the switch device according to the second embodiment of the present invention, and the same reference numerals are given to portions corresponding to those in FIG.

  The switch device shown in FIG. 3 is greatly different from the first embodiment described above in that a protrusion 12a for pushing the central portion of the movable contact 9 is attached to the adhesion preventing sheet 12 instead of the flexible sheet 10. . That is, on the smooth lower surface of the adhesion preventing sheet 12, downward projections 12a are respectively projected at a plurality of locations facing the central portion of the movable contact 9 with the flexible sheet 10 interposed therebetween. Thus, the pressing operation force of the operation key 3 is applied to the lower movable contact 9. These protrusions 12a are also formed on a smooth surface which becomes the lower surface of the adhesion preventing sheet 12 using a dispenser or the like, similar to the protrusion 10a described above.

  When the protrusion 12a is attached to the lower surface of the adhesion preventing sheet 12 just above the center of the movable contact 9, the pressed operation key 3 always corresponds to the corresponding movable contact 9 via the lower protrusion 12a. Therefore, even when the operation key 3 is pushed and the projection 12a is pushed obliquely from above, the pressing operation force is always applied to the central portion of the movable contact 9. Therefore, similarly to the first embodiment, the second embodiment can remarkably stabilize the reversing operation of the movable contact 9 during the pressing operation, and can effectively prevent malfunction.

  FIG. 4 is a cross-sectional view of an essential part of the switch device according to the third embodiment of the present invention, and the same reference numerals are given to portions corresponding to those in FIG.

  The switch device shown in FIG. 4 is that the through holes 12b are provided in the adhesion preventing sheet 12 at a plurality of positions facing the group of protrusions 10a attached to the smooth upper surface of the flexible sheet 10, as described in the first embodiment. It is very different from the example. When the plurality of through holes 12b are provided in the adhesion preventing sheet 12 so as to individually penetrate the group of protrusions 10a on the flexible sheet 10 side, the flexible light guide 6 is directly placed on each protrusion 10a. Since it can be mounted, the height of the switch device can be reduced by the thickness of the adhesion prevention sheet 12 as compared with the first embodiment shown in FIG.

It is principal part sectional drawing of the switch apparatus which concerns on the example of 1st Embodiment of this invention. It is a top view which abbreviate | omits a cover case and shows the switch apparatus shown in FIG. It is principal part sectional drawing of the switch apparatus which concerns on the 2nd Example of this invention. It is principal part sectional drawing of the switch apparatus which concerns on the example of 3rd Embodiment of this invention.

Explanation of symbols

1 substrate 2 LED (light source)
2a Light emitting unit 3 Operation key 5 Sheet member with contact 6 Flexible light guide plate 6a Side end surface 6b Illuminating unit 6c Light receiving unit 6f Positioning hole 7 Fixed contact 8 Common contact 9 Movable contact 10 Flexible sheet 10a Protrusion 11 Fixed unit 12 Contact prevention sheet 12a Protrusion 12b Through hole

Claims (4)

A flexible device that is interposed between a substrate on which a light source and a plurality of switch elements are disposed and a plurality of operation keys that can press drive the switch element group, and that holds each movable contact of the switch element group on one surface. A movable contact unit for a switch comprising a conductive sheet and a flexible light guide laminated on the other surface of the flexible sheet,
Between the flexible sheet and the flexible light guide, an adhesion preventing sheet in which a number of fine irregularities are formed only on the surface facing the flexible light guide, A plurality of protrusions capable of individually pressing a predetermined position of each of the movable contact groups is provided on either one of the opposing surfaces of the flexible sheet and the adhesion preventing sheet, and the operation keys correspond to the protrusions via the protrusions. A movable contact unit for a switch, characterized in that the movable contact is pushed in.   The projection group according to claim 1, wherein the projection group is provided on the flexible sheet, and a plurality of through holes are provided in the adhesion prevention sheet to individually penetrate the projection group. Movable contact unit for switch. A light source mounted on a substrate, a plurality of fixed contacts provided on the substrate, a plurality of movable contacts that can be brought into contact with and separated from the fixed contacts, and the movable contact group is held by holding the movable contacts on one surface. A predetermined area that is fixed on the substrate, a plurality of operation keys capable of individually pressing and driving the movable contact group, and an adhesion preventing sheet on the other surface of the flexible sheet. A flexible light guide,
The adhesion prevention sheet has a large number of fine irregularities formed only on the surface facing the flexible light guide, and on either one of the opposed surfaces of the flexible sheet and the adhesion prevention sheet. A switch device comprising: a plurality of protrusions capable of individually pressing a predetermined position of each of the movable contact groups, wherein the operation key pushes the corresponding movable contact through the protrusion.   4. The method according to claim 3, wherein the projection group is provided on the flexible sheet, and a plurality of through holes are provided in the adhesion prevention sheet to individually penetrate the projection group. Switch device to do.

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