JP2011187308A - Sheet with contact spring and switch device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet with a contact spring and a switch device capable of effectively restraining light leak between illumination regions without worsening operation feeling, in dividing and illuminating a plurality of illuminating regions with different emission colors. <P>SOLUTION: The sheet with a contact spring is provided with a retention sheet 3 for retaining a plurality of contact springs 12 in a plurality of housing parts 31, a light guide sheet 4 laminated on the retention sheet 3 for guiding light from a light source unit 7, slits S zoning the light guide sheet 4 into a plurality of illumination regions A, and light-shielding parts 33 each reflecting or absorbing light from the light source unit 7 at each slit S. At the retention sheet 3, a communication channel 32 communicating between each two of the plurality of housing parts 31 and fitted between adjacent illumination regions A through each slit S and each light-shielding part 33 is formed so as to be overlapped with each slit S outside an irradiation range by the light source unit 7 in plane view. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seat with a contact spring and a switch device, and more particularly to a seat with a contact spring and a switch device incorporated in an operation panel of an electronic device.

  In general, as a sheet with a contact spring incorporated in an operation panel for various electronic devices, a sheet having a light guide sheet for illuminating an operation key of the operation panel is known. The light guide sheet is made of a light-transmitting material and is attached on the circuit board of the mobile terminal. Further, a light source is disposed in the vicinity of the end portion of the light guide sheet, and light emitted from the light source enters the sheet from the end surface of the light guide sheet. The light incident on the sheet is diffused by an illumination pattern formed at a position corresponding to the operation key of the portable terminal, and the operation key is lit from the inside.

  In recent years, operation panels that light operation keys in different colors have been developed to enhance the decoration effect of electronic devices. Conventionally, as a sheet with a contact spring used for such an operation panel, a sheet in which a light guide sheet is divided into a plurality of illumination regions is known (for example, see Patent Document 1). In the sheet with a contact spring described in Patent Document 1, the light guide sheet is divided into a plurality of illumination regions by a slit and a light shielding portion applied to the slits, and a light source is arranged for each region to enable divided illumination.

JP 2009-140871 A

  By the way, the sheet | seat with a contact spring is comprised by sticking the holding sheet which hold | maintains several contact springs to the lower surface of a light guide sheet through the adhesion part. The holding sheet is formed with a plurality of accommodating portions for holding the contact springs, and the plurality of accommodating portions are communicated with each other by a communication path. The seat with a contact spring allows air to move between the accommodating portions by this communication path, and reduces the reaction force of the compressed air during the pressing operation so that a good operation feeling can be obtained.

  However, when the slit is formed from the light guide sheet side with respect to the sheet with the contact spring like the sheet with the contact spring described in Patent Document 1, the overlapping portion of the slit and the communication path of the holding sheet is used. There was a possibility that the slit could penetrate the communication path due to variations in processing accuracy. In this case, when the light-shielding portion is formed by printing, there is a possibility that the inside of the communication path is blocked by the printing liquid that has flowed from the slit, and the operation feeling is deteriorated. For this reason, in the conventional sheet with a contact spring, no slit is provided on the communication path, and light leakage between the illumination areas cannot be prevented.

  The present invention has been made in view of such circumstances, and a sheet with a contact spring that can effectively suppress light leakage between illumination regions without deteriorating the operation feeling when divided illumination is performed, and An object is to provide a switch device.

  The sheet with contact springs of the present invention includes a holding sheet that holds a plurality of contact springs in a plurality of accommodating portions, and a light guide sheet that is laminated on the holding sheet and guides light from a light source, and the light guide. A slit that divides the sheet into a plurality of illumination areas; a light-shielding portion that reflects or absorbs light from the light source in the slit; and a communication path that communicates between the plurality of accommodating portions to the holding sheet. The communication path provided between the illumination regions adjacent to each other through the slit and the light shielding portion is formed so as to overlap the slit outside the irradiation range by the light source in plan view.

  According to this configuration, since the communication path between adjacent illumination areas is formed so as to overlap the slit outside the irradiation range by the light source in a plan view, between the illumination areas above the communication path (on the light guide sheet side). Light leakage can be reduced. In addition, since light leakage between the illumination areas is reduced, light leakage can be sufficiently suppressed even with a shallow slit on the communication path, and by forming the slit shallow, penetration of the slit and the communication path can be prevented. it can. Therefore, the slit does not penetrate the communication path and the operation feeling is not deteriorated, and light leakage between the illumination areas can be effectively suppressed.

  In the seat with a contact spring according to the present invention, the slit is formed such that a portion overlapping the communication passage formed in the holding sheet is shallower than a portion not overlapping the communication passage.

  According to this configuration, even if the slit is formed in the portion overlapping the communication path, the slit does not penetrate the communication path. Moreover, since the part which overlaps with a communicating path is located outside the irradiation range by a light source in planar view, even if it is a shallow slit, light leakage can fully be suppressed.

  In the seat with a contact spring according to the present invention, the interior of the accommodating portion is communicated between the illumination regions adjacent to each other via the slit and the light shielding portion by the single communication path.

  According to this configuration, the irradiation range can be freely set as compared with the configuration in which the holding sheet is provided with a plurality of communication passages, and thus the degree of freedom in arranging the light sources can be increased.

  In the sheet with a contact spring according to the present invention, the light shielding part is formed by application of a light shielding liquid, and a part of the light shielding liquid penetrates into the light guide sheet.

  According to this configuration, the light leakage between the illumination regions can be effectively suppressed without penetrating the slit by penetrating the permeable shading liquid into the light guide sheet.

  According to another aspect of the present invention, there is provided a switch device comprising: the above-described seat with a contact spring; and a substrate provided with a plurality of fixed contacts to which the plurality of contact springs are separated from each other.

  According to this configuration, it is possible to easily manufacture a switch device that effectively suppresses light leakage between the illumination areas without deteriorating the operation feeling when the plurality of illumination areas are divided and illuminated with different emission colors. it can.

  According to the present invention, when the plurality of illumination areas are divided and illuminated, light leakage between the illumination areas can be effectively suppressed without deteriorating the operation feeling.

It is a figure which shows embodiment of the sheet | seat with a contact spring which concerns on this invention, and is an upper surface schematic diagram of a switch apparatus. It is a figure which shows embodiment of the sheet | seat with a contact spring which concerns on this invention, and is sectional drawing which follows the AA line of a switch apparatus. It is a figure which shows embodiment of the sheet | seat with a contact spring which concerns on this invention, and is sectional drawing which follows the BB line of a switch apparatus. It is a figure which shows embodiment of the sheet | seat with a contact spring which concerns on this invention, and is explanatory drawing of the slit formed in the sheet | seat with a contact spring. It is a figure which shows embodiment of the sheet | seat with a contact spring which concerns on this invention, and is a figure which shows the relationship between the irradiation range by a light source unit, and the arrangement position of a slit. It is a figure which shows the relationship between the depth of the slit of a sheet | seat with a contact spring which concerns on this invention, and a communication part. It is a figure which shows embodiment of the sheet | seat with a contact spring which concerns on this invention, and is explanatory drawing of formation of the light-shielding part by osmosis | permeation printing.

  The sheet with a contact spring to which the present invention is applied is used by being incorporated in an operation panel for various electronic devices. The sheet with contact spring includes a light guide sheet that illuminates the operation key from the inside, and a holding sheet that is stacked on the light guide sheet via an adhesive portion and holds a plurality of contact springs. The light guide sheet is partitioned into a plurality of illumination areas by slits and light shielding portions, and is divided and illuminated for each illumination area. The holding sheet holds a plurality of contact springs in a plurality of accommodating portions, and the interior of the plurality of accommodating portions is communicated by a communication path.

  In such a sheet 41 with a contact spring, as shown in FIG. 6A, the slit S is formed only in the light guide sheet 42 and the adhesive portion 43 where light travels, so that the holding sheet 44 is not damaged. Light leakage between adjacent illumination regions can be suppressed. However, as shown in FIG. 6B, in the portion where the slit S and the communication path 45 overlap, the slit S penetrates the communication path 45 due to a processing error or the like, and enters the communication path 45 when the light shielding portion 46 is formed. There is a possibility that the printing liquid may flow in and block the communication path 45. In order to avoid this, as shown in FIG. 6C, it is conceivable that the slit S is shallowly formed in the portion where the slit S and the communication path 45 overlap. There is a problem that light is transmitted through the adhesive section 43 and light leakage between adjacent illumination areas cannot be sufficiently suppressed.

  In the essence of the present invention, when the plurality of illumination areas are divided and illuminated, the communication path 45 is provided outside the irradiation range of the light source, and the slit S overlapping the communication path 45 is formed shallow, so that the slit S is formed in the communication path 45. The light leakage between the illumination regions is effectively suppressed without penetrating the light. Note that the irradiation range of the light source refers to an effective range for illuminating the illumination pattern in the illumination region, that is, a range in which a sufficient amount of light travels.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The switch device of the present invention is mainly attached to various electronic devices such as a mobile phone, a remote controller, an audio device, and an electronic camera, and functions as an input operation unit. With reference to FIG. 1, the overall configuration of the switch device will be described. FIG. 1 is a schematic top view of a switch device according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA of the switch device shown in FIG. 3 is a cross-sectional view taken along line BB of the switch device shown in FIG. In FIG. 1, for convenience of explanation, the key mat member is omitted from the drawing.

  As shown in FIGS. 1 to 3, the switch device 1 according to the present embodiment is incorporated in a casing of a mobile phone (not shown), and includes a plurality of light source units 7R and 7W and a plurality of fixed contacts 11. A circuit board 8 is provided. A sheet 2 with a contact spring is attached to the upper surface of the circuit board 8. The sheet 2 with contact springs is configured by a holding sheet 3 that holds a plurality of contact springs 12 disposed at each fixed contact 11 and a light guide sheet 4 that is attached to the upper surface of the holding sheet 3 via an adhesive portion 5. Is done.

  In addition, an operation panel (not shown) is provided on the case of the mobile phone so as to face the circuit board 8, and operation keys 14 are arranged on the operation panel so as to face each of the fixed contacts 11. A key mat member 6 is provided. The operation key 14 has a character portion indicating the type of key on the upper surface. The character part has translucency and is illuminated from the inside of the housing by the light incident on the light guide sheet 4.

  The circuit board 8 is formed of an insulating material into a substantially rectangular plate shape when viewed from above, and a plurality of fixed contacts 11 and a conductor pattern (not shown) are formed on the upper surface. Each of the plurality of fixed contacts 11 includes an annular peripheral fixed contact 21 and a circular central fixed contact 22 positioned at the center of the peripheral fixed contact 21. The peripheral fixed contact 21 and the central fixed contact 22 have a conductor pattern. To a control unit (not shown).

  The plurality of light source units 7 </ b> R and 7 </ b> W are configured to include light emitting diodes (LEDs), and are disposed with a slight gap with respect to one side surface of the light guide sheet 4. In this case, the light source unit 7R has a red LED that lights the operation key 14 in red, and the light source unit 7W has a white LED that lights the operation key 14 in white. The light emitted from the light source units 7R and 7W propagates in the light guide sheet 4 in the radial direction and illuminates a predetermined range.

  Each contact spring 12 is formed in a dome shape by, for example, a conductive metal plate. Each contact spring 12 is placed on the peripheral fixed contact 21 with the bulging direction facing upward, and is configured to be able to contact the central fixed contact 22 when reversed by a pressing operation. Therefore, when the contact spring 12 is reversed by the pressing operation, the central fixed contact 22 and the peripheral fixed contact 21 are conducted through the contact spring 12.

  The holding sheet 3 is formed in a rectangular shape when viewed from above, and is configured by laminating a top sheet 24 and a spacer sheet 25. The top sheet 24 is formed in a rectangular shape in plan view with an insulating film such as polyester. Further, an adhesive is entirely applied to the lower surface of the top sheet 24, and the contact spring 12 is held by the adhesive and the spacer sheet 25 is integrated.

  The spacer sheet 25 is formed of an insulating film such as polyester in a rectangular shape in plan view, and a plurality of accommodating portions 31 of the plurality of contact springs 12 are formed at positions corresponding to the plurality of fixed contacts 11. An adhesive is entirely applied to the lower surface of the spacer sheet 25, and the holding sheet 3 is attached to the upper surface of the circuit board 8 with the plurality of contact springs 12 held by the adhesive. In addition, the interior of the plurality of accommodating portions 31 are communicated with each other by a communication passage 32, and the communication passage 32 enables air to move between the insides of the accommodation portions 31. The communication path 32 reduces the reaction force of the compressed air during the pressing operation of the switch device 1 so that a good operation feeling can be obtained for the user.

  The light guide sheet 4 is formed in a rectangular shape in plan view with a transparent film having translucency such as urethane resin, and is adhered to the upper surface of the holding sheet 3 via the adhesive portion 5. The adhesive portion 5 is provided by applying an adhesive to the lower surface of the light guide sheet 4. A material having a light guide property is also used for the adhesive constituting the adhesive portion 5. The light guide sheet 4 is divided into three illumination areas A1-A3 by two types of slits S1, S2 having different depths. In this case, the part which overlaps the communicating path 32 of the light guide sheet 4 is partitioned by the shallow slit S1, and the other part is partitioned by the deep slit S2.

  The three illumination areas A1-A3 are the red illumination areas A1 and A2 illuminated by red light and the white illumination area A3 illuminated by white light. The red illumination areas A1 and A2 are illuminated by a light source unit 7R having a red LED. The light source unit 7 </ b> R that makes light incident on the red illumination areas A <b> 1 and A <b> 2 is arranged to include an illumination pattern (not shown) within the irradiation range. The white illumination area A3 is illuminated by the light source unit 7W having a white LED. The light source unit 7W that causes light to enter the white illumination region A3 is arranged so as to include an illumination pattern (not shown) within the irradiation range. The light source units 7R and 7W are arranged so as to remove the slit S1 from the irradiation range, details of which will be described later.

  The light emitted from the light source units 7 </ b> R and 7 </ b> W enters the light guide sheet 4 and propagates while repeating reflection on the upper and lower surfaces of the light guide sheet 4. The light propagating through the light guide sheet 4 is reflected and diffused by an illumination pattern formed at a position corresponding to the operation key 14 of the light guide sheet 4, and is emitted toward the operation key 14. With this configuration, the character portion of the operation key 14 is uniformly illuminated from the inside. In addition, the light guide sheet 4 has such a thickness that does not affect the operation feeling when the operation key 14 is pressed.

  In the switch device 1 configured as described above, when the operation key 14 is pressed, the contact spring 12 is reversed, and the central fixed contact 22 and the peripheral fixed contact 21 are conducted through the contact spring 12. The illumination pattern may be configured to emit light propagating in the light guide sheet 4 toward the operation key 14, or may be configured by illumination grooves formed on the upper surface or the lower surface of the light guide sheet 4. Alternatively, white dot printing may be used.

  Here, the slit formed in the sheet | seat with a contact spring is demonstrated with reference to FIG. Drawing 4 is an explanatory view of a slit formed in a sheet with a contact spring concerning an embodiment of the invention.

  As shown in FIG. 4A, the slit S <b> 1 is a substantially V-shaped groove processed into the light guide sheet 4 by laser processing or the like, and is formed leaving a slight thickness in the light guide sheet 4. . The slit S1 is formed with a light shielding portion 33 that prevents light incident on the illumination area A from leaking to other illumination areas by the light shielding printing liquid (light shielding liquid) attached to the surface of the slit S1. ing. The light shielding portion 33 is formed so as to cover the slit S1 by, for example, ink jet printing using black UV curable ink. As described above, the slit S1 reduces light leakage in the illumination region A by the light shielding portion 33 formed on the surface, but the slight thickness of the light guide sheet 4 and the light-transmitting material attached below the light guide sheet 4 are used. Light leakage through the light-sensitive adhesive portion 5 cannot be prevented.

  Further, the slit S <b> 1 is formed only in the light guide sheet 4 above the communication path 32 of the holding sheet 3, so that it does not penetrate the communication path 32. Therefore, the slit S1 prevents the printing liquid from flowing into the communication path 32 and prevents the communication path 32 from being blocked when the light shielding portion 33 is formed by printing. Therefore, the movement of the air between the inside of the accommodating part 31 is ensured, and an operation feeling is not deteriorated at the time of pressing operation of the switch apparatus 1.

  As shown in FIG. 4B, the slit S <b> 2 is a substantially V-shaped groove processed across the light guide sheet 4, the adhesive portion 5, and the holding sheet 3 by laser processing or the like, and the upper part of the holding sheet 3. Is slightly removed. The slit S2 is also formed with a light shielding portion 33 that prevents light incident in the illumination area A from leaking to other illumination areas due to the printing liquid attached to the surface of the slit S2. The light shielding part 33 is formed so as to cover the slit S2 by inkjet printing or the like, similarly to the case where it is formed in the slit S1. At this time, since the light-shielding part 33 is formed so as to straddle the light guide sheet 4, the adhesive part 5, and the holding sheet 3, the light incident on the light guide sheet 4 is guided by the light guide sheet 4, the adhesive part 5, and It is possible to reliably prevent leakage from the gap between the holding sheets 3.

  Thus, since the slit S2 is formed above the portion of the holding sheet 3 where the communication path 32 is not formed, it can be formed deeper than the slit S1. In addition, the cross-sectional shape of the slits S1 and S2 is not limited to the above-described substantially V shape, and may be any shape as long as the light guide sheet 4 can be partitioned. In particular, the cross-sectional shape of S <b> 2 may be a slope shape in a portion along the outer edge of the light guide sheet 4. Further, the printing liquid is not limited to the black ink described above, and any printing liquid that can absorb or reflect light may be used. For example, when a reflective film is formed as the light shielding portion 33 in the slits S 1 and S 2, more light can be taken into the light guide sheet 4.

  With reference to FIG. 5, the relationship between the irradiation range by a light source unit and the arrangement position of a slit is demonstrated. FIG. 5 is a diagram showing the relationship between the irradiation range by the light source unit and the arrangement position of the slits according to the embodiment of the present invention.

  As shown in FIG. 5, the light guide sheet 4 is divided into three illumination areas A1-A3 by slits S1, S2. In addition, the holding sheet 3 laminated on the lower surface of the light guide sheet 4 is formed with a plurality of accommodating portions 31 for the contact spring 12, the accommodating portion 31 a in the illumination region A 1, the accommodating portion 31 b in the illuminated region A 2, and the illuminated region. The accommodating portions 31c and 31d are respectively positioned at A3. Further, the inside of the accommodating portions 31a and 31c is communicated by a communication path 32a, the accommodating portions 31b and 31d are communicated by a communicating path 32b, and the accommodating portions 31c and 31d are communicated by a communicating path 32c.

  The communication paths 32a and 32b are located below the slit S1. For this reason, the slit S1 is shallowly formed so as not to penetrate the communication paths 32a and 32b. The light source unit 7 </ b> R is arranged so as to include an illumination pattern located above the contact spring 12 within the irradiation range. In this case, the overlapping portion between the slit S1 and the communication paths 32a and 32b is formed at a position that avoids the irradiation range (for example, ± about 50 degrees) of the light source unit 7R.

  The light source unit 7 </ b> W is arranged to include an illumination pattern located above the contact spring 12 in the illumination range. Also in this case, the overlapping portion of the slit S1 and the communication paths 32a and 32b is formed at a position that avoids the irradiation range (for example, ± about 50 degrees) of the light source unit 7W. That is, the communication paths 32a and 32b are formed so as to overlap the slit S1 outside the irradiation range of the light source units 7R and 7W.

  As described above, since the slit S1 is formed with a slight thickness so that the slit S1 does not penetrate the communication passages 32a and 32b, the light guide sheet 4 has a slight thickness and adhesive portion. This is because it is not possible to prevent light leakage through the. With this configuration, the light source units 7R and 7W reduce light leakage between the illumination areas A1 and A3 as much as possible by removing the overlapping portion between the slit S1 and the communication paths 32a and 32b from the irradiation range.

  In addition, as described above, since the light shielding portion 33 is formed across the light guide sheet 4, the adhesive portion 5, and the holding sheet 3 in the portion where the slit S <b> 2 is formed, light leakage between the illumination regions A <b> 1-A <b> 3 is prevented. It becomes possible to prevent reliably. Therefore, the light leakage of red light from the red illumination areas A1 and A2 to the white illumination area A3 is significantly reduced, and it is possible to suppress color mixture of red light and white light in the white illumination area A3. Further, in the overlapping portion between the slit S1 and the communication paths 32a and 32b, the slit S1 does not penetrate the communication paths 32a and 32b, and the function of the communication paths 32a and 32b is not impaired.

  Moreover, between the red illumination area | region A1 and the white illumination area | region A3, between the accommodating parts 31a and 31c is connected by the single communication path 32a. Similarly, between the red illumination area A2 and the white illumination area A3, the interiors of the accommodating portions 31b and 31d are communicated by a single communication path 32b. For this reason, since the overlapping part of the communicating path 32 and the slit S1 can be minimized and the irradiation range of the light source units 7R and 7W can be widened, the degree of freedom of the installation positions of the light source units 7R and 7W is increased. .

  As described above, according to the switch device 1 according to the present embodiment, the communication paths 32a and 32b between the adjacent red illumination areas A1 and A2 and the white illumination area A3 are irradiated by the light source units 7R and 7W in plan view. Since it is formed so as to overlap the slit outside the range, light leakage between the illumination areas A can be reduced. Further, since light leakage between the illumination areas A1 and A3 is reduced, light leakage can be sufficiently suppressed even with the shallow slit S1 on the communication paths 32a and 32b, and the slit and the communication paths 32a and 32b can be suppressed by the shallow slit S1. Can be prevented from penetrating. Therefore, the slit S1 penetrates the communication passages 32a and 32b and the operational feeling of the switch device 1 is not deteriorated, and light leakage between the illumination areas A can be effectively suppressed.

  In the above-described embodiment, the shallow slit is formed by leaving a slight thickness in the light guide sheet, but is not limited to this configuration. The shallow slit only needs to be formed so as not to penetrate the communication path, and may be formed across the light guide sheet and the adhesive portion, for example.

  In the above-described embodiment, the light shielding portion is formed by the light shielding printing liquid attached to the surface of the slit. However, the present invention is not limited to this configuration. The light shielding part may have any configuration as long as light can be shielded in the slit. For example, as shown in FIG. 7, a part of the printing liquid may penetrate into the light guide sheet. In this case, after the sublimable printing liquid is applied to the surface of the slit, the printing liquid is permeated into the light guide sheet by heating the printing liquid. Thereby, compared with the structure which apply | coats a printing liquid to the surface of a slit, effective light-shielding performance can be acquired. In particular, light leakage between the illumination regions can be effectively suppressed even in the portion where the shallow slit is formed.

  Further, in the above-described embodiment, the inside of the accommodating portion between the irradiation areas is configured to be communicated by the single communication path, but is not limited to this configuration. As long as the overlapping portion of the slit and the communication path is out of the irradiation range of the light source unit, the interior of the housing between the irradiation regions may be communicated with each other by a plurality of communication paths.

  In the above-described embodiment, the light guide sheet is formed of urethane resin, but is not limited to this configuration. The light guide sheet may be a sheet that can guide light. For example, the light guide sheet may be formed of polycarbonate resin.

  In the above embodiment, the light source of the light source unit has been described as a light emitting diode, but the present invention is not limited to this configuration. Any light source may be used as long as it has an amount of light that can uniformly emit light in each illumination region of the light guide sheet.

  In the above-described embodiment, the light guide sheet is divided into the red illumination region and the white illumination region. However, the present invention is not limited to this configuration. Adjacent illumination regions may be illuminated with different emission colors, or may be illuminated with the same emission color. Further, when adjacent illumination areas are illuminated with the same emission color, each illumination area may be illuminated simultaneously or independently. As a result, the operation key corresponding to the illumination area can be turned on independently, for example, can be turned on only when the call key or the call end key is pressed. Further, the adjacent illumination areas may be illuminated with different colored lights such as red light and green light. Furthermore, the illumination area may be a multicolor illumination area that is illuminated with different emission colors by a plurality of light source units.

  Further, in the above-described embodiment, the deep slit is formed so as to straddle the light guide sheet, the holding sheet, and the adhesive portion, but is not limited to this configuration. The deep slit only needs to be able to sufficiently suppress light leakage between the illumination regions, and may be formed so as to straddle the light guide sheet and the adhesive portion, for example.

  Further, in the above-described embodiment, the light shielding portion is formed by the adhesion of the printing liquid to the slit by inkjet printing or the like, but is not limited to this configuration. The light shielding portion may be formed by any device or method as long as it is formed by applying a light shielding liquid to the slope portion.

  In the above-described embodiment, the switch device in which the contact spring is held on the circuit board by the holding sheet has been described as an example. However, the present invention is not limited to this configuration. Any configuration may be used as long as the switch device uses the light guide sheet according to the present invention.

  The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  As described above, according to the present invention, when a plurality of illumination areas are divided and illuminated with different emission colors, the light leakage between the illumination areas can be effectively suppressed without deteriorating the operation feeling. And is particularly useful for a seat with a contact spring and a switch device incorporated in an operation panel of an electronic device.

DESCRIPTION OF SYMBOLS 1 Switch apparatus S1, S2 Slit A1, A2 Red illumination area A3 White illumination area 2 Sheet with contact spring 3 Holding sheet 4 Light guide sheet 5 Adhesive part 6 Key mat member 7R, 7W Light source unit (light source)
8 Circuit board 11 Fixed contact 14 Operation key 21 Peripheral fixed contact 22 Center fixed contact 24 Surface sheet 25 Spacer sheet 31 Storage part 32 Communication path 33 Light-shielding part

Claims (5)

A holding sheet that holds a plurality of contact springs in a plurality of housing portions, and a light guide sheet that is stacked on the holding sheet and guides light from a light source,
A slit that divides the light guide sheet into a plurality of illumination regions, and a light shielding unit that reflects or absorbs light from the light source in the slit,
A communication path that communicates with the holding sheet through the interior of the plurality of accommodating portions, and is provided between the illumination regions adjacent to each other via the slit and the light shielding portion, and is outside the irradiation range of the light source in a plan view. A sheet with a contact spring formed so as to overlap the slit.   2. The sheet with contact spring according to claim 1, wherein the slit is formed such that a portion that overlaps the communication path formed in the holding sheet is shallower than a portion that does not overlap the communication path.   The seat with a contact spring according to claim 1 or 2, wherein the interior of the housing portion is communicated between the illumination regions adjacent to each other via the slit and the light shielding portion by a single communication path. .   4. The contact spring according to claim 1, wherein the light shielding part is formed by application of a light shielding liquid, and a part of the light shielding liquid penetrates into the light guide sheet. With sheet.   5. A switch device comprising: the contact spring-equipped sheet according to claim 1; and a board provided with a plurality of fixed contacts on which the plurality of contact springs are separated from and connected to each other.

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