JP2008186674A - Switching movable contact unit, and switch device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switching movable contact unit excellent in assembling workability, capable of reducing manufacturing cost and power consumption, capable of suppressing light leakage and excellent in illumination quality, and provide a switching device using such a switching movable contact unit. <P>SOLUTION: By making a light-emitting part 2a of an LED 2 mounted on a substrate 1 opposed to a light incident part 6c of a flexible light guide plate 6, light of the LED 2 introduced into the light guide plate 6 is made to be projected to the bottom faces of operation keys 3 via an illuminating part 6b of the light guide plate 6. The flexible light guide plate 6 is laminated on a flexible sheet 9 of a sheet member 5 with contacts, and a plurality of movable contacts 10 are arranged and installed at the lower face side of the flexible sheet 9 and arranged in opposition to a group of fixed contacts 7 in a manner of freely contacting with and separating from the group of the fixed contacts. Between the flexible sheet 9 and the substrate 1, spacer plates 11 are disposed which are set to have the thickness approximately equal to the height dimension of the movable contacts 10, and the movable contacts 10 are housed in through-holes 12 thereof. The movable contacts 10 are pressed and driven by the operation keys 3 via the flexible light guide plate 6 and the flexible sheet 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a movable contact unit for a switch incorporated in a switch device with an illumination function including a plurality of switch elements that are individually pressed and driven by a plurality of operation keys, and a switch device using such a movable contact unit for a switch. About.

  For example, in an input unit such as a cellular phone, if an operation key group for individually pressing and driving a plurality of switch elements can be visually recognized even in a dark place, light is projected from the bottom side to the operation key group. Accordingly, an illumination device is often incorporated which illuminates characters, symbols, and the like of the operation key group. As a conventional example of such a switch device with an illumination function, a structure in which a light source such as an LED is mounted in the vicinity of each bottom surface of the operation key group on a substrate on which the switch element group is disposed is widely known. However, in such a conventional structure, since many light sources have to be mounted on the substrate, there is a problem that the manufacturing cost and power consumption increase.

In order to solve such problems, a light source is attached to one end of a light guide plate made of a flexible translucent resin, and the light guide plate is placed on the substrate so as to cover the switch element group. Then, by connecting the light source to the substrate, each operation key can be driven to push the movable contact of each switch element toward the fixed contact via the light guide plate, and the light source introduced from one side end can be driven. Conventionally, a switch device with an illumination function has been proposed in which light is refracted by an illumination portion of a light guide plate and projected onto the bottom surface of an operation key group (see, for example, Patent Document 1). When a flexible light guide plate capable of introducing light from the 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. 2)

  However, in the conventional proposal disclosed in Patent Document 1, the work of dispersing 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 inventors have mounted a movable contact group by placing a sheet member with a contact formed by holding a plurality of movable contacts on one surface of a flexible sheet. A switch device having a structure in which light from a light source mounted on a substrate is incident on a side end surface of a flexible light guide plate laminated on the flexible sheet. investigated. However, when a dome-shaped leaf spring suitable as a movable contact is distributed and arranged on one surface of the flexible sheet, the flexible sheet placed on the substrate rises in the area where each movable contact exists. When a flexible light guide plate is laminated on a conductive sheet, the same bulge (curved portion) is also generated on the light guide plate. As a result, light traveling inside the light guide plate is likely to leak to the outside through the curved portion. It has been found that a new problem arises that light loss occurs and the operation keys far from the light source cannot be illuminated with a sufficient amount of light.

  The present invention has been made in view of the actual situation of the prior art as described above. The first object of the present invention is that the assembly workability is good and the manufacturing cost and power consumption can be reduced. Is to provide a movable contact unit for a switch. 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 described above, the switch movable contact unit of the present invention is placed on a substrate on which a light source and a plurality of fixed contacts are disposed so as to cover these fixed contact groups, and the substrate. A movable contact unit for a switch having a surface opposite to a side opposite to a bottom surface of a plurality of operation keys, wherein a plurality of movable contacts made of a reversible dome-shaped leaf spring are arranged on one surface side of a flexible sheet. The movable contact group has a contact-attached sheet member disposed on the substrate so that the movable contact group faces the fixed contact group so as to be contactable and separable, and a plurality of through holes for individually accommodating the movable contact group. The thickness dimension is substantially the same as the height dimension of the movable contact, and the spacer is disposed between the flexible sheet and the substrate, and is laminated on the other side of the flexible sheet. Part of the light becomes a light incident part where light from the light source is incident. And a flexible light guide plate provided with illumination portions at a plurality of locations facing the bottom surface of the operation key group, and the operation key is movable through the flexible light guide plate and the flexible sheet. By pressing the contact, the movable contact comes into contact with the corresponding fixed contact, and the light of the light source introduced from the light incident part into the flexible light guide plate passes through the illumination part. And projected onto the bottom surface of the operation key.

  Since the switch movable contact unit configured as described above uses a flexible light guide plate, the number of light sources can be greatly reduced, and the manufacturing cost and power consumption can be reduced. In addition, since the light source may be mounted on the substrate, the assembly workability is improved as compared with the structure in which the light source is attached to the flexible light guide plate and then connected to the substrate. In addition, a plurality of movable contacts held on the flexible sheet can be collectively arranged on the substrate, and the flexible light guide plate can be easily arranged with high positional accuracy with respect to the movable contact group. Therefore, the assembly workability is extremely good. Further, a spacer having a through hole for accommodating the movable contact is disposed between the flexible sheet and the substrate, and the thickness of the spacer is substantially equal to the height of the movable contact. The flexible light guide plate on the flexible sheet is also arranged in a flat plate shape substantially parallel to the substrate without being raised even on the movable contact. Light traveling through the optical plate is less likely to leak outside in an undesired region.

  In the movable contact unit for a switch described above, if there is a gap between the inner wall surface of the through hole of the spacer and the peripheral edge of the movable contact accommodated in the through hole, the movable contact is reversed in the through hole. Since the operation is not hindered and it becomes easy to secure a bending space of the flexible sheet during the pressing operation in the through hole, the reliability can be improved. In this case, if the gap is non-uniform by making the planar shape of the through hole different from the planar shape of the movable contact accommodated in the through hole, the flexible sheet bends during the pressing operation. Since the planar size of the entire through-hole can be suppressed while ensuring space, high-density mounting can be performed without impairing reliability.

  In the switch movable contact unit described above, when the spacer is fixed on one side of the flexible sheet and the flexible light guide plate is fixed on the other side, the movable contact group is arranged on the flexible sheet. Since the sheet member with contacts, the spacer, and the flexible light guide plate can be handled as an integrated product, storage and transportation are facilitated.

  In order to achieve the second object, a switch device according to the present invention includes a light source mounted on a substrate, a plurality of fixed contacts provided on the substrate, and a plurality of dome-shaped leaf springs that can be reversed. A movable contact is disposed on one surface side of the flexible sheet, and the movable contact group is disposed on the substrate so that the movable contact group faces the fixed contact group in a detachable manner, and the movable contact A spacer having a plurality of through holes for individually accommodating groups and having a thickness dimension substantially equal to a height dimension of the movable contact and disposed between the flexible sheet and the substrate And a light incident part on which the light from the light source is incident partially laminated on the other surface side of the flexible sheet, and provided with illumination parts at a plurality of locations facing the bottom surface of the operation key group A flexible light guide plate, and the flexible light guide plate and the flexible sheet through the flexible sheet. A plurality of operation keys for individually pressing and driving the contact group, and the light of the light source introduced into the flexible light guide plate from the light incident part via the illumination part. Configured to be projected on.

  In the switch device configured as described above, since the flexible light guide plate is used, the number of light sources can be greatly reduced, and the manufacturing cost and power consumption can be reduced. In addition, since the light source may be mounted on the substrate, the assembly workability is improved as compared with the structure in which the light source is attached to the flexible light guide plate and then connected to the substrate. In addition, this switch device uses a sheet member with contacts, and a plurality of movable contacts held by the flexible sheet can be collectively arranged on the substrate, so that the assembly workability is extremely good. Further, a spacer having a through hole for accommodating the movable contact is disposed between the flexible sheet and the substrate, and the thickness of the spacer is substantially equal to the height of the movable contact. The flexible light guide plate on the flexible sheet is also arranged in a flat plate shape substantially parallel to the substrate without being raised even on the movable contact. Light traveling through the optical plate is less likely to leak outside in an undesired region.

  In the above switch device, if there is a gap between the inner wall surface of the through hole of the spacer and the peripheral edge of the movable contact accommodated in the through hole, the reversing operation of the movable contact in the through hole is obstructed. In addition, since it becomes easy to secure a bending space of the flexible sheet in the through hole during the pressing operation, the reliability can be improved. In this case, if the gap is non-uniform by making the planar shape of the through hole different from the planar shape of the movable contact accommodated in the through hole, the flexible sheet bends during the pressing operation. Since the planar size of the entire through-hole can be suppressed while ensuring space, high-density mounting can be performed without impairing reliability.

  Since the movable contact unit for a switch of the present invention uses a flexible light guide plate, the number of light sources can be greatly reduced, and the manufacturing cost and power consumption can be reduced. In addition, since the light source may be mounted on the substrate, the assembly workability is improved as compared with the structure in which the light source is attached to the flexible light guide plate and then connected to the substrate. In addition, a plurality of movable contacts held on the flexible sheet can be collectively arranged on the substrate, and the flexible light guide plate can be easily arranged with high positional accuracy with respect to the movable contact group. Therefore, the assembly workability is extremely good. Further, a spacer having a through hole for accommodating the movable contact is disposed between the flexible sheet and the substrate, and the thickness of the spacer is substantially equal to the height of the movable contact. The flexible light guide plate on the flexible sheet is also arranged in a flat plate shape substantially parallel to the substrate without being raised even on the movable contact. Light traveling through the optical plate is less likely to leak outside in an undesired region, and high-quality illumination that can be illuminated with a sufficient amount of light even with an operation key far from the light source can be realized.

  Further, since the switch device of the present invention uses a flexible light guide plate, the number of light sources can be greatly reduced, and the manufacturing cost and power consumption can be reduced. In addition, since the light source may be mounted on the substrate, the assembly workability is improved as compared with the structure in which the light source is attached to the flexible light guide plate and then connected to the substrate. In addition, this switch device uses a sheet member with contacts, and a plurality of movable contacts held by the flexible sheet can be collectively arranged on the substrate, so that the assembly workability is extremely good. Further, a spacer having a through hole for accommodating the movable contact is disposed between the flexible sheet and the substrate, and the thickness of the spacer is substantially equal to the height of the movable contact. The flexible light guide plate on the flexible sheet is also arranged in a flat plate shape substantially parallel to the substrate without being raised even on the movable contact. Light traveling through the optical plate is less likely to leak outside in an undesired region, and high-quality illumination that can be illuminated with a sufficient amount of light even with an operation key far from the light source can be realized.

  FIG. 1 is a plan view showing a switch device according to an embodiment of the present invention with a lid case omitted, and FIG. 2 is a cross-sectional view of a main part of the switch device. FIG. 3 is a cross-sectional view of a main part of a movable contact unit used in the switch device, and FIG. 4 is a rear view of a sheet member with a contact constituting the movable contact unit.

  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 on this sheet | seat member 5 with a contact, and the sheet | seat member 5 with a contact and the flexible light-guide plate 6 are integrated previously in the lamination | stacking state, and are a movable contact unit. 15 is handled. A fixed contact 7 and a common contact 8 are provided below the operation keys 3 on the upper surface of the substrate 1, and both the contacts 7 and 8 are exposed at a predetermined interval so as to be electrically non-conductive. is doing. Further, the substrate 1 is provided with a wiring pattern, a through hole, etc. (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. The light emitting portion 2a of the LED 2 faces the central portion of the side end surface 6a along one side edge of the flexible light guide plate 6 in a close state, and is emitted from the light emitting portion 2a and introduced into the flexible light guide plate 6. The light is projected onto the bottom surface of the operation key 3 through the illumination part 6 b of the light guide plate 6.

  The sheet member 5 with a contact of the movable contact unit 15 includes a flexible sheet 9 made of a translucent resin such as PET (polyethylene terephthalate) and a plurality of movable contacts 10 disposed on the lower surface of the flexible sheet 9. And a synthetic resin spacer plate 11 adhered to the lower surface of the flexible sheet 9 in an area where the movable contact group 10 does not exist. Each movable contact 10 is made of a metal dome-shaped leaf spring that generates a click feeling when reversed, and these movable contacts 10 are bonded and fixed at predetermined positions on the lower surface of the flexible sheet 9. The spacer plate 11 has a plurality of through holes 12 for individually accommodating the movable contact 10 group. As shown in FIG. 4, each through hole 12 has a substantially parallelogram shape that is different from the movable contact 10 in plan view, and is slightly larger than the movable contact 10. Therefore, a non-uniform gap 12a exists between the inner wall surface of each through hole 12 and the peripheral edge portion of the movable contact 10 accommodated therein. Adhesive layers 11a and 11b (see FIG. 3) are provided on both front and back surfaces of the spacer plate 11. The spacer plate 11 is adhered to the flexible sheet 9 by the adhesive layer 11a, and the adhesive layer 11b A sheet member 5 with a contact is attached to the substrate 1. Further, since the overall thickness dimension of the spacer plate 11 is set to be equal to the height dimension of the movable contact 10, the flexible sheet 9 is arranged substantially parallel to the substrate 1 without being raised on the movable contact 10. Therefore, the flexible light guide plate 6 on the flexible sheet 9 is also arranged in a flat plate shape substantially parallel to the substrate 1.

  The contact-attached sheet member 5 is arranged on the substrate 1 so that the movable contact group 10 faces the fixed contact group 7 so as to be able to contact and separate, and is fixed to the substrate 1 by the adhesive layer 11 b of the spacer plate 11. . When the contact-attached sheet member 5 is positioned and fixed on the substrate 1 in this way, as shown in FIG. 2, the peripheral portion of the movable contact 10 comes into contact with the common contact 8 and is always conductive, and the central portion of the movable contact 10 is It faces the fixed contact 7 so as to be able to contact and separate. However, when the movable contact unit 15 is stored or transported, a release tape (not shown) is attached to the adhesive layer 11b of the spacer plate 11, and the release tape is peeled off at the stage of fixing the sheet member 5 with contact to the substrate 1. To expose the adhesive layer 11b. In addition, the sheet member 5 with contacts is formed with two positioning holes (not shown) for defining the mounting position with respect to the substrate 1, and a group of movable contacts 10 is arranged with reference to these positioning holes.

  The flexible light guide plate 6 of the movable contact unit 15 is formed by molding a flexible material having excellent translucency such as urethane or silicon into a sheet shape, and the flexible sheet 9 of the sheet member 5 with contacts. Are integrated in a laminated state on the upper surface. 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 position facing the bottom surface of the operation key 3. The central portion of the side end surface 6a of the flexible light guide plate 6 is a light incident portion 6c into which light from the LED 2 is incident. As shown in FIG. 1, the four corners of the flexible light guide plate 6 and two places near the light incident portion 6 c are attachment portions 6 d, and these attachment portions 6 d use an adhesive on the upper surface of the flexible sheet 9. Is fixed. That is, the flexible light guide plate 6 is indirectly fixed to the substrate 1 via the flexible sheet 9. However, the attachment portion 6d may be a portion where the flexible sheet 9 is subjected to, for example, thermocompression bonding, laser welding, or ultrasonic welding. Further, there are two positioning holes 6f (positioning holes of the sheet member 5 with contacts are not shown) for defining the mounting position with respect to the substrate 1 at two locations corresponding to the flexible light guide plate 6 and the sheet member 5 with contacts. Is formed. Since the flexible light guide plate 6 is mounted on the substrate 1 with the positioning holes 6f as a reference, the mounting portion 6d is set so as not to fall within the range of the light emission angle from the LED 2.

  It is also possible to directly fix the flexible light guide plate 6 that is not fixed to the sheet member with contacts 5 to the substrate 1. That is, the flexible light guide plate 6 is laminated on the flexible sheet 9 after the sheet member 5 with contacts is assembled to the substrate 1, and the portion protruding from the flexible sheet 9 of the light guide plate 6 is bonded. You may fix directly to the board | substrate 1 using an agent. Alternatively, only the spacer plate 11 may be fixed on the substrate 1 first, and the flexible sheet 9 provided with the movable contact 10 group may be laminated on the spacer plate 11 to be integrated. However, if the movable contact unit 15 in which the spacer plate 11 is fixed on one surface side of the flexible sheet 9 and the flexible light guide plate 6 is fixed on the other surface side is manufactured in advance, storage and transportation are easy. It becomes. Further, it is possible to arrange the LED 2 in a storage hole provided in the flexible light guide plate 6 and guide the light to the illumination part 6b. In this case, the inner wall surface of the storage hole is the light incident part 6c. It becomes.

  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 presses the desired operation key 3 downward, the movable contact 10 is pressed and driven through the flexible light guide plate 6 and the flexible sheet 9, so that when the operation key 3 is lowered by a predetermined stroke, it is movable. The central portion of the contact 10 is reversed and contacts the fixed contact 7. As a result, the fixed contact 7 and the common contact 8 are brought into conduction through the movable contact 10, so that the switch is switched on. In addition, since a click feeling is generated when the movable contact 10 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 10 returns to its original dome shape by its own elasticity, and the flexible light guide plate 6 and the flexible sheet 9 are also eliminated from bending. The operation key 3 is pushed up to the initial position.

  As described above, in this 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.

  Further, in this embodiment, the sheet member 5 with contacts in which the movable contact 10 group is disposed on the lower surface side of the flexible sheet 9 is used, and the flexible light guide plate 6 is provided on the sheet member 5 with contacts. Are integrated in a stacked state to form the movable contact unit 15, so that the group of movable contacts 10 can be collectively disposed on the substrate 1, and the flexible light guide plate 6 can be disposed with respect to the group of movable contacts 10. Therefore, it is easy to arrange with high positional accuracy, and therefore the assembly workability is very good. Moreover, the spacer plate 11 of the sheet member with contact 5 is provided with an adhesive layer 11b on which the release sheet is detachably attached, so that the release sheet is attached to the sheet member with contact 5 during storage or transportation. The sheet member 5 with a contact point may be fixed to the substrate 1 by peeling the release sheet when assembled on the substrate 1. Therefore, the movable contact unit 15 is very easy to handle and is suitable for storage and transportation.

  In this embodiment, the spacer plate 11 having the accommodating through hole 12 for the movable contact 10 is disposed between the flexible sheet 9 and the substrate 1, and the thickness of the spacer plate 11 is determined by the movable contact. 10, the flexible sheet 9 is arranged so as to be substantially parallel to the substrate 1 without being raised on the movable contact 10, and the flexible light guide plate 6 on the flexible sheet 9. Are also arranged in a flat plate shape substantially parallel to the substrate 1. Therefore, the light of the LED 2 traveling in the flexible light guide plate 6 is less likely to leak to the outside in an undesired region, and the light guide loss is greatly reduced. The operation key 3 far from the LED 2 can be illuminated with a sufficient amount of light. Therefore, it is possible to realize high-quality illumination with little illumination unevenness of the entire switch device.

  In addition, the spacer plate 11 used in this embodiment example has a through hole 12 slightly larger than the movable contact 10, and a gap between the inner wall surface of the through hole 12 and the peripheral portion of the movable contact 10 accommodated therein. 12a is generated, so that the reversing operation of the movable contact 10 in the through hole 12 is not hindered, and it is easy to secure the bending space of the flexible sheet 9 in the through hole 12 during the pressing operation. Reliability is increasing. In addition, since the spacer plate 11 has a planar shape of the through-hole 12 different from that of the movable contact 10 so that the gap 12a is non-uniform, the bending space of the flexible sheet 9 at the time of the pressing operation. As a result, the planar size of the entire through-hole 12 is suppressed while ensuring high-density mounting. Therefore, high-density mounting can be performed without impairing reliability.

  In the present embodiment, the positioning holes 6f and the like for defining the mounting position with respect to the substrate 1 are formed in the flexible light guide plate 6 and the sheet member 5 with contacts. By inserting a positioning pin (not shown) into the substrate 1, the flexible light guide plate 6 and the sheet member 5 with a contact can be easily and accurately assembled to the substrate 1.

It is a top view which abbreviate | omits a cover case and shows the switch apparatus which concerns on the embodiment of this invention. It is principal part sectional drawing of the switch apparatus shown in FIG. It is principal part sectional drawing of the movable contact unit used for the switch apparatus shown in FIG. It is a reverse view of the sheet member with a contact which comprises this movable contact unit.

Explanation of symbols

1 substrate 2 LED (light source)
2a Light emitting part 3 Operation key 4 Cover case 5 Sheet member 6 with contact 6 Flexible light guide plate 6b Illumination part 6c Light incident part 7 Fixed contact 8 Common contact 9 Flexible sheet 10 Movable contact 11 Spacer plate 11a, 11b Adhesive layer 12 Through hole 12a Clearance 15 Movable contact unit

Claims (7)

A movable contact unit for a switch, which is placed on a substrate on which a light source and a plurality of fixed contacts are disposed so as to cover these fixed contact groups, and whose surface opposite to the substrate is opposed to the bottom surfaces of a plurality of operation keys. Because
A plurality of movable contact points made of dome-shaped leaf springs that can be reversed are arranged on one surface side of the flexible sheet, and these movable contact groups are arranged on the substrate so as to face the fixed contact groups so as to be able to contact and separate. A sheet member with a contact, and a plurality of through holes for individually accommodating the movable contact group, the thickness dimension being substantially the same as the height dimension of the movable contact, and the flexible sheet And a spacer disposed between the substrate and the substrate, a part of the flexible sheet laminated on the other side of the flexible sheet, and a part of the light incident portion into which light from the light source is incident, and the operation key group A flexible light guide plate provided with an illumination portion at a plurality of locations facing the bottom surface,
The operation key presses the movable contact via the flexible light guide plate and the flexible sheet so that the movable contact comes into contact with the corresponding fixed contact, and from the light incident portion. The switch movable contact unit characterized in that the light of the light source introduced into the flexible light guide plate is projected onto the bottom surface of the operation key via the illumination unit.   2. The movable contact unit for a switch according to claim 1, wherein a gap exists between an inner wall surface of the through hole of the spacer and a peripheral portion of the movable contact accommodated in the through hole. .   The switch movable contact unit according to claim 2, wherein the planar shape of the through hole is different from the planar shape of the movable contact accommodated in the through hole.   The switch according to any one of claims 1 to 3, wherein the spacer is fixed to one surface side of the flexible sheet and the flexible light guide plate is fixed to the other surface side. Movable contact unit. A light source mounted on a substrate, a plurality of fixed contacts provided on the substrate, and a plurality of movable contacts made of a reversible dome-shaped leaf spring are arranged on one side of the flexible sheet, and these movable A sheet member with a contact disposed on the substrate so that the contact group faces the fixed contact group in a detachable manner, and has a plurality of through holes for individually accommodating the movable contact group. The dimension is substantially the same as the height dimension of the movable contact, a spacer disposed between the flexible sheet and the substrate, and a portion laminated on the other side of the flexible sheet. A flexible light guide plate having a light incident portion into which light from the light source is incident and having illumination portions provided at a plurality of locations facing the bottom surface of the operation key group, and the flexible light guide plate and the flexible A plurality of operation keys for individually pressing and driving the movable contact group through a sheet.
The switch device, wherein the light of the light source introduced into the flexible light guide plate from the light incident portion is projected onto the bottom surface of the operation key through the illumination portion.   6. The switch device according to claim 5, wherein a gap exists between an inner wall surface of the through hole of the spacer and a peripheral portion of the movable contact accommodated in the through hole.   7. The switch device according to claim 6, wherein a planar shape of the through hole is different from a planar shape of the movable contact accommodated in the through hole.

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