JP2013218810A - Movable contact body with light guide function - Google Patents

Abstract

Provided is a movable contact body with a light guide function capable of efficiently taking in light of an LED into a light guide sheet and reducing the number of LEDs used.
A spacer sheet is bonded to a lower surface of a base sheet made of an insulating film holding a plurality of movable contacts, and a light guide sheet is attached to the upper surface of the base sheet via an adhesive. In the movable contact body with a light guide function in which the holes 26 are pasted and the holes 28 penetrating them are provided, the opening 29B smaller than the holes 28 corresponding to the positions of the holes 28 is formed on the lower surface of the light guide sheet 26. The first reflection sheet 29 provided with the second reflection sheet 30 is bonded, and the second reflection sheet 30 is bonded to the upper surface of the light guide sheet 26 so as to close the hole 28.
[Selection] Figure 2

Description

  The present invention relates to a movable contact body with a light guide function that is used in an input operation section of various electronic devices and is mounted on a wiring board having a fixed contact to constitute a panel switch.

  2. Description of the Related Art In recent years, a variety of movable contact bodies with a light guide function that are mounted on a wiring board having a fixed contact and constitute a panel switch have been adopted in various electronic devices.

  Such a conventional movable contact body with a light guide function will be described with reference to FIGS.

  FIG. 6 is a plan view of a conventional movable contact body with a light guide function, and FIG. 7 is a cross-sectional view showing the same mounting state.

  In the figure, reference numeral 1 denotes a base sheet made of a flexible insulating film whose outer shape in top view is formed in a substantially rectangular shape, and an adhesive 1A is applied to the lower surface thereof. 3 (3A, 3B) is a movable contact made of an elastic thin plate metal formed in an upward convex dome shape. The movable contacts 3A, 3B are attached to the upper surface of the base sheet 1 by an adhesive 1A. Is held at a predetermined position.

  4 is a spacer sheet made of an insulating film whose outer shape is formed in substantially the same shape as the base sheet 1, and the upper surface thereof is adhered to the base sheet 1 via an adhesive 1A. The spacer sheet 4 is individually provided with movable contact accommodating holes 5 slightly larger than the outer periphery of the movable contact 3 for each arrangement position of the movable contact 3, and the movable contact 3 is located in the corresponding movable contact accommodating hole 5. Arranged in a contained state. Here, the movable contact accommodating hole 5 formed in the spacer sheet 4 is continuously provided with an enlarged hole portion protruding with a predetermined width on the peripheral side. An adhesive 4 </ b> A is applied to the lower surface of the spacer sheet 4.

  Furthermore, a light guide sheet 6 having an outer shape substantially the same as that of the base sheet 1 is bonded onto the base sheet 1 via an adhesive 7 disposed on the lower surface of the outer edge portion. The light guide sheet 6 includes a base material 6A made of an insulating film having flexibility, and a plurality of protrusions provided in a scattered state on a lower surface portion of the base material 6A corresponding to the position where each movable contact 3 is disposed. 6B. In addition, although illustration is abbreviate | omitted, the protrusion 6B has a some fine particle used as a scatterer inside.

  In the light guide sheet 6, the base sheet 1, and the spacer sheet 4 that are arranged so as to overlap each other, the position between the movable contact 3A and the movable contact 3B penetrates the above three members in a substantially rectangular shape when viewed from above. A hole 8 is formed so as to do so. The hole 8 is provided independently without being connected to the movable contact accommodating hole 5 of the spacer sheet 4 and the enlarged hole provided continuously therewith. In addition, the lower surface position of the light guide sheet 6 corresponding to the peripheral position of the hole 8 is also bonded to the upper surface of the base sheet 1 via the adhesive 7.

  The conventional movable contact body with a light guide function is comprised by the above.

  As shown in FIG. 7, the movable contact body with a light guide function described above is used by being stuck on a wiring board 11 of an electronic device typified by a mobile phone. On the wiring board 11, an outer fixed contact 11 </ b> A corresponding to the outer peripheral portion of the movable contact 3 and a central fixed contact 11 </ b> B corresponding to the central portion of the movable contact 3 are arranged electrically independently. Further, LEDs 12A and 12B are mounted on the wiring board 11 in an adjacent state. The LEDs 12 </ b> A and 12 </ b> B are mounted so that the light emitting surfaces of the LEDs 12 </ b> A are opposite to each other and irradiate light substantially parallel to the upper surface of the wiring board 11.

  The movable contact body with a light guide function is bonded onto the wiring substrate 11 with the adhesive 4 </ b> A of the spacer sheet 4. In the mounted state, the movable contact 3 is placed in a contact state with the lower end of the outer periphery on the corresponding outer fixed contact 11A, and the lower surface of the central portion faces the corresponding central fixed contact 11B with a predetermined interval. This is a so-called panel switch.

  Moreover, LED12A and 12B are accommodated in the hole 8 of the movable contact body with a light guide function in the mounting state. Here, the light emitting surface of the LED 12A is adjacent to the side surface of the hole 8 facing the movable contact 3A side. Similarly, the light emitting surface of the LED 12B is adjacent to the side surface forming the hole 8 facing the movable contact 3B side.

  An operation panel including an operation button 14 and a panel case 15 is disposed above the panel switch. Each operation button 14 is arranged with the operation part 14 </ b> A protruding from the button hole of the panel case 15, and the lower surface of the substantially cylindrical pressing part 14 </ b> B protruding downward corresponds to the central part of the movable contact 3. The light guide sheet 6 is in contact with the upper surface position.

  Next, the operation will be described. When the operation portion 14 </ b> A of the operation button 14 is pressed, the central portion of the lower movable contact 3 is pressed by the pressing portion 14 </ b> B via the light guide sheet 6 and the base sheet 1. When the pressing force exceeds a predetermined force, the dome-shaped central portion of the movable contact 3 is elastically reversed with a click feeling, and the lower surface of the central portion comes into contact with the lower central fixed contact 11B to switch on. It becomes. When the pressing force is released, the movable contact 3 is reversed and returned upward with a click feeling, the central portion is separated from the central fixed contact 11B, and the original switch-off state is restored.

  Here, when the movable contact 3 is elastically reversed at the time of pressing, the air in the movable contact 3 is in a compressed state along with the reversal operation, but as an air reservoir for releasing the compressed air, The enlarged hole portion provided in the spacer sheet 4 functions, and the operation feeling due to the compressed air is suppressed.

  When the LEDs 12A and 12B mounted on the wiring board 11 emit light, each side end portion of the light guide sheet 6 that forms part of the side surface of the adjacent hole 8, that is, the side end portion of the through hole in the light guide sheet 6. , The light from the LEDs 12A and 12B is incident on the base material 6A and propagates through the base material 6A. At this time, the light from the LED 12A propagates mainly to the movable contact 3A side, and the light from the LED 12B propagates mainly to the movable contact 3B side. Then, the light propagating through the base material 6A of the light guide sheet 6 is scattered and reflected by fine particles (not shown) in the plurality of protrusions 6B, so that each operation button 14 disposed above is illuminated. It was supposed to be done.

  As prior art document information related to the invention of this application, for example, Patent Document 1 and Patent Document 2 are known.

JP 2005-268165 A JP 2008-204769 A

  As described above, the conventional movable contact body with a light guide function is provided with the hole portion 8 penetrating vertically at the position between the movable contact point 3A and the movable contact point 3B, and the light emitting surfaces of the hole portion 8 are opposite to each other. The LEDs 12A and 12B are arranged in the accommodated state so that the light enters the light guide sheet 6 from the side end portion of the light guide sheet 6 that forms part of the side surface of the hole 8 and the left and right In this case, the upper position corresponding to each of the movable contacts 3A and 3B is illuminated with a predetermined illuminance.

  However, this conventional device has a problem that it requires a large number of LEDs to be mounted and correspondingly requires a large amount of power to be used.

  This invention solves such a conventional subject, and it aims at providing the movable contact body with a light guide function which can reduce the quantity of LED used.

  In order to achieve the above object, the present invention has the following configuration.

  The present invention includes a base sheet made of an insulating film that holds a movable contact made of an elastic thin plate metal below, and a flexibility that is arranged above the base sheet and guides incident light within a base made of an insulating film. A movable contact body with a light guide function, wherein the light guide sheet is provided with a through hole, and the lower surface side of the light guide sheet corresponds to the position of the through hole. Includes a first reflective sheet having an opening smaller than the through hole, and a second reflective sheet for closing the through hole on the upper surface side of the light guide sheet corresponding to the position of the through hole. The movable contact body with a light guide function is characterized by having the configuration described above.

  If it is this, it will be set as the structure which arranged only one LED which light-emits upwards in the lower position of a 1st reflective sheet corresponding to the said opening part position, and the light of LED is 1st through an opening part. And between the first reflecting sheet and the second reflecting sheet, the light is propagated to the side end portion in the through hole of the light guide sheet while repeating reflection, and the light is transmitted between the first reflecting sheet and the second reflecting sheet. It has the effect | action that what can be efficiently injected in a light guide sheet | seat is realizable.

  ADVANTAGE OF THE INVENTION According to this invention, the advantageous effect that the movable contact body with a light guide function which can take in the light of LED efficiently in a light guide sheet, and can reduce the usage-amount of LED can be obtained.

The top view of the movable contact body with a light guide function by one embodiment of this invention Cross section Sectional view showing the same mounting state Partial enlarged sectional view showing the incidence of light in the same wearing state Sectional drawing which shows the mounting state of the movable contact body with a light guide function by other embodiment of this invention Plan view of a conventional movable contact with light guide function Sectional view showing the same mounting state

  Embodiments of the present invention will be described below with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of the prior art, and detailed description is simplified.

(Embodiment)
FIG. 1 is a plan view of a movable contact body with a light guiding function according to an embodiment of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a sectional view showing the same mounting state, and FIG. FIG. 5 is a cross-sectional view showing a mounting state of a movable contact body with a light guide function according to another embodiment of the present invention.

  In the figure, 21 is a base sheet made of an insulating film (for example, made of PET film) having a substantially rectangular shape in a top view and having flexibility, and an adhesive 21A is formed on the lower surface thereof. The upper surfaces of the two movable contacts 3 (3A, 3B) are respectively held by the adhesive 21A. In addition, since the arrangement position of the movable contact 3 is the same as that of the prior art, detailed description is omitted.

  Reference numeral 24 denotes a spacer sheet made of an insulating film (for example, made of PET film) whose outer shape is formed in substantially the same shape as that of the base sheet 21, and is adhered to the lower surface side of the base sheet 21 via an adhesive 21A. An adhesive 24 </ b> A is formed on the lower surface of the spacer sheet 24.

  Here, in the spacer sheet 24, movable contact accommodating holes 25 that are slightly larger than the outer periphery of each movable contact 3 are provided at positions corresponding to the respective movable contacts 3 in an independent state. An enlarged hole is integrally formed in the housing hole 25 on the peripheral side.

  Then, the light guide sheet 26 is disposed on the base sheet 21, and the lower surface of the outer edge portion is bonded to the base sheet 21 via the adhesive 27. The light guide sheet 26 has substantially the same shape as that of the base sheet 21 in a top view, and the configuration thereof is the same as that of the conventional art in the position where the base 26A made of an insulating film and the movable contact 3 are disposed. It consists of a plurality of projections 26B provided in a scattered state on the lower surface portion of the corresponding base material 26A, and has a plurality of fine particles (not shown) that become scatterers in the projections 26B. .

  Furthermore, in the light guide sheet 26, the base sheet 21, and the spacer sheet 24 that are arranged so as to overlap each other, the above three members are penetrated at a position between the movable contact 3A and the movable contact 3B in a substantially rectangular shape when viewed from above. A hole 28 formed as described above is provided.

  The shape of the hole portion 28 is formed in a substantially rectangular shape in a top view that is slightly larger than the shape in a top view of the LED 32 described later.

  In the embodiment, the through-hole portion of the light guide sheet 26 that forms a part of the hole portion 28 has a first reflection sheet 29 and a second reflection sheet that are larger than the hole portion 28 in a top view. 30 is arranged so as to be sandwiched from above and below. That is, at the peripheral position of the hole portion 28, the spacer sheet 24, the base sheet 21, the first reflection sheet 29, the light guide sheet 26, and the second reflection sheet 30 are sequentially laminated from the bottom.

  The first reflection sheet 29 is made of a substantially rectangular flexible insulating film that is slightly larger than the hole 28 in a top view, and is disposed between the base sheet 21 and the light guide sheet 26. A substantially rectangular opening 29 </ b> B is provided at a substantially central position of the first reflection sheet 29. The upper surface of the first reflection sheet 29 is set to a light color such as white, and is easy to reflect light. The first reflection sheet 29 includes an adhesive 29A on the lower surface.

  The first reflection sheet 29 is arranged corresponding to the position of the hole 28, and the lower surface side of the outer edge is bonded to the upper surface position of the base sheet 21 around the hole 28 via the adhesive 29A over the entire circumference. Yes. Further, the adhesive 27 is also formed over the entire circumference at the lower surface position of the light guide sheet 26 around the hole portion 28, and the first reflective sheet 29 is also adhesive over the entire upper surface side of the outer edge. The light guide sheet 26 is bonded to the lower surface of the hole 28 around the hole 28. The opening 29B is set to a shape smaller than the shape of the LED 32, which will be described later, when viewed from above.

  The second reflection sheet 30 is made of a substantially rectangular insulating film whose lower surface has specular reflectivity, and is bonded onto the light guide sheet 26 via the adhesive 30A on the lower surface of the outer edge so as to correspond to the position of the hole 28. It has been. A through hole in the light guide sheet 26 forming a part of the hole portion 28 is closed at an upper position by the second reflection sheet 30. That is, the second reflection sheet 30 is disposed so as to close the hole 28. The second reflective sheet 30 is preferably made of a flexible film made of PET, for example, having a specular reflectivity by aluminum vapor deposition. Furthermore, if the adhesive 30A is not formed at the lower surface position of the second reflecting sheet 30 corresponding to the region in the hole 28 as described above, the light reflecting state by the second reflecting sheet 30 can be made excellent. Therefore, the pressure-sensitive adhesive 30 </ b> A may be formed at the lower surface position corresponding to the inner region of the hole 28 as long as the pressure-sensitive adhesive 30 </ b> A is made of, for example, acrylic or silicon.

  The movable contact body with a light guide function according to this embodiment is configured as described above, and is used by being attached to a wiring board 31 of an electronic device in the same manner as in the past as shown in FIG.

  On the wiring board 31, the outer fixed contact 31A corresponding to the outer peripheral portion of each movable contact 3 and the central fixed contact 31B corresponding to the central portion of each movable contact 3 are arranged in an electrically independent state. Same as before.

  Even in the mounted state of the movable contact body with a light guide function, the adhesive sheet 24A on the lower surface of the spacer sheet 24 is bonded and mounted on the wiring board 31, and in this mounted state, on the outer fixed contact 31A. It is the same as in the prior art that the lower end of the outer periphery of the corresponding movable contact 3 is put on and abuts, and the center fixed contact 31B and the lower surface of the central portion of the movable contact 3 are vertically opposed to each other with a predetermined gap therebetween. It is. Furthermore, an operation panel including an operation button 14 and a panel case 15 is arranged above the panel switch in the same manner as in the prior art.

  Here, in the embodiment, only one LED 32 is mounted on the wiring board 31. Moreover, the LED 32 has a light emitting surface that is substantially parallel to the wiring board 31 and a so-called top emission type that emits light upward. The LED 32 has a substantially rectangular parallelepiped shape, and includes an electrode (not shown) to be soldered to the wiring board 31 at the bottom, and the light emitting element 32A disposed at the center position includes a resin containing fluorescent particles or pigment particles. It is a general one formed by molding. That is, the LED 32 has the highest light intensity from the position where the light emitting element 32A as the light source is disposed.

  And the said LED32 is distribute | arranged by the accommodation state under the 1st reflection sheet 29 within the hole 28 of the movable contact body with a light guide function. Around the upper surface of the LED 32, the first reflective sheet 29 portion in the hole 28 is bonded via an adhesive 29A so as to be covered. On the other hand, the central position where the light emitting element 32A of the LED 32 is disposed is located in the opening 29B of the first reflection sheet 29 and is exposed upward as viewed from above.

  The first reflective sheet 29 in the hole 28 is covered with the position around the upper surface of the LED 32 and bent slightly upward according to the height dimension of the LED 32, but bent upward. The upper surface position of the first reflection sheet 29 does not come into contact with the upper second reflection sheet 30 and has a predetermined gap.

  Next, the operation will be described. When the operation portion 14A of the operation button 14 is pressed, the central portion of the movable contact 3 positioned below is pressed by the pressing portion 14B through the light guide sheet 26 and the base sheet 21 as in the prior art. When the pressing force exceeds a predetermined force, the dome-shaped central portion of the movable contact 3 is elastically inverted with a click feeling and comes into contact with the lower central fixed contact 31B. As a result, the outer fixed contact 31A and the central fixed contact 31B are electrically connected via the movable contact 3, and the switch is turned on. When the pressing force is released, the movable contact 3 is reversed and returned upward with a click feeling, and the central portion is separated from the central fixed contact 31B and is switched off. In addition, when the movable contact 3 at the time of pressing is elastically reversed, the enlarged hole portion provided continuously with the movable contact accommodating hole 25 functions as an air reservoir for releasing the compressed air accompanying the reversing operation. This is the same as the conventional one.

  When the LED 32 emits light, in the movable contact body with a light guide function, the side end portion of the light guide sheet 26 that forms a part of the side surface of the hole portion 28, that is, the side end portion of the through hole in the light guide sheet 26 has an entire circumference. For example, as shown in FIG. 4, the light from the LED 32 is incident on the base material 26A. Note that the arrows in FIG. 4 schematically show how the light from the LEDs 32 enters the light incident portion of the light guide sheet 26.

  As shown in FIG. 4, the light from the LED 32 is irradiated upward on the movable contact 3 </ b> A side, for example, as indicated by a solid arrow A <b> 1. And the light shown with the solid line arrow A1 is reflected by the lower surface of the 2nd reflective sheet 30, and as shown to the solid line arrow A2, it is irradiated toward the downward direction. Further, the light indicated by the solid line arrow A2 is reflected by the upper surface of the first reflecting sheet 29 as indicated by the solid line arrow A3, and is again irradiated upward to reach the side end portion to be guided. It is taken into the sheet 26.

  That is, the light from the LED 32 enters the space surrounded by the lower surface of the second reflection sheet 30 and the upper surface of the first reflection sheet 29 in the hole portion 28 through the opening 29B. The light propagates in the direction parallel to the surface of the wiring board 31 while repeating the reflection, and is taken into the light guide sheet 26 from the side end portion of the light guide sheet 26 forming a part of the side surface of the hole 28. Here, since the lower surface of the second reflection sheet 30 and the upper surface of the first reflection sheet 29 are configured to easily reflect light, the light is guided without excessive attenuation of light. The light is incident on the side end portion of 26.

  Furthermore, with this configuration, the light that has been reflected at the side end portion of the light incident portion and has not been taken into the light guide sheet 26 can also be reflected on the lower surface of the second reflective sheet 30 in the hole portion 28 and the first surface. It can be expected that the light is reflected in the space surrounded by the upper surface of the reflection sheet 29, and is then irradiated again into the light incident portion and taken into the light guide sheet 26.

  In this embodiment, only the central position of the LED 32 in the top view is exposed from the opening 29B, and the position around the upper surface of the LED 32 is covered with the first reflection sheet 29, so that the light intensity of the LED 32 is high. The light from the visual center position is captured through the opening 29B, and the captured light is reflected between the second reflective sheet 30 and the first reflective sheet 29 with a small loss to reach the light incident section. Yes. If it is this structure, since the upper surface position of the outer edge part of LED32 which is distant from the top view center position of LED32 is covered with the 1st reflective sheet 29, the light leak from the covered part etc. can also be prevented. In other words, when the shape of the opening 29B is appropriately set, the intensity of the light from the LED 32 taken into the space can be adjusted, and the light can be efficiently incident on the light guide sheet 26 while suppressing attenuation. can do.

  Furthermore, if the lower surface of the first reflection sheet 29 is dark such as black, the light leakage can be prevented more reliably.

  In addition, although the state where the light from the LED 32 is incident on the end portion of the light guide sheet 26 on the movable contact 3A side has been described above, the same applies to the movable contact 3B side. That is, as shown in FIG. 4, the light indicated by the solid line arrow B <b> 1 irradiated upward from the LED 32 on the movable contact 3 </ b> B side is reflected by the lower surface of the second reflecting sheet 30 as indicated by the solid line arrow B <b> 2. As shown in B 3, the light is reflected on the upper surface of the first reflection sheet 29 and is taken into the light guide sheet 26. Note that the solid line arrows in FIG. 4 are representatively illustrated in order to explain the state of light propagation from the LED 32. Actually, the light from the LED 32 is irradiated in various directions. The same applies to the propagation state of light directed in the direction of.

  Then, the light introduced into the base material 26A of the light guide sheet 26 propagates while being repeatedly reflected within the base material 26A, is scattered at the positions of the protrusions 26B, and is distributed upward by the scattered light. The operation button 14 is illuminated.

  As described above, in the embodiment, the light from the LED 32 is introduced into the space between the second reflection sheet 30 and the first reflection sheet 29 through the opening 29B in the hole 28. The light is reflected between the lower surface of the second reflection sheet 30 and the upper surface of the first reflection sheet 29 and propagates in the direction parallel to the wiring board 31, and from the side end portion in the through hole of the light guide sheet 26. Since it is configured to take in the light guide sheet 26, light from the LED 32 can be efficiently taken into the light guide sheet 26, and only one top-emitting type LED 32 is disposed between the movable contacts 3A and 3B. A movable contact body with a light guide function that can easily illuminate the upper portion corresponding to each of the movable contacts 3A and 3B can be realized.

  In the above description, the upper surface of the first reflection sheet 29 is set to a light color such as white. However, the first reflection sheet 29 may have a specular reflectivity like the lower surface of the second reflection sheet 30.

  Furthermore, if the adhesive 30A on the lower surface of the second reflection sheet 30 and the adhesive 27 on the upper surface of the light guide sheet 26 are made of acrylic or silicon, and have high transparency, the side of the through hole of the light guide sheet 26 You may make it take in the light of LED32 also from an end surface part vicinity.

  In the above description, the case where the first reflection sheet 29 configured as a single unit is used has been described. For example, as illustrated in FIG. 5, the base sheet 41 includes a component corresponding to the first reflection sheet 29. It is good also as what was made to do. The description will be given below, but the description of the same parts as the above-described configuration will be omitted.

  FIG. 5 is a sectional view showing a mounted state of a movable contact body with a light guide function according to another embodiment of the present invention.

  The base sheet 41 is made of an insulating film having a substantially rectangular shape when viewed from above (for example, made of PET film). The outer shape of the base sheet 41 is the same as that of the base sheet 21, and the adhesive 41A formed on the lower surface moves the movable contact. 3 (3A, 3B) The upper surface is adhered and held at a predetermined position, and is bonded to the upper surface of the spacer sheet 24. A light guide sheet 26 is bonded to the upper surface of the base sheet 41 with an adhesive 27.

  In this embodiment, the spacer sheet 24 and the light guide sheet 26 are each provided with a through hole having the same shape as the hole 28 in a top view, and these constitute a hole 48. The base sheet 41 has a portion extending into the hole 48 in a top view, and has a substantially rectangular opening 41B that is smaller than the top view shape of the LED 32 at the center position in the top view. ing. Further, the upper surface position of the base sheet 41 in the hole portion 48 is a bright color such as white or has a specular reflectivity.

  In addition, the adhesive 27 is formed over the entire circumference at the lower surface position of the light guide sheet 26 around the hole 48, and the light guide sheet 26 is attached to the upper surface of the base sheet 41 at the outer edge peripheral position and the position. Yes.

  And the 2nd reflective sheet 30 is bonded together by 30 A of adhesives on the upper surface of the light guide sheet 26 so that the hole 48 may be covered and covered from upper direction. Thus, the movable contact body with a light guide function is configured.

  As shown in FIG. 5, the movable contact body with a light guide function having the above-described configuration is formed by using the adhesive 24A on the lower surface of the spacer sheet 24 at a predetermined position on the upper surface of the wiring board 31 on which the outer fixed contact 31A and the central fixed contact 31B are arranged. The panel switch is configured by pasting together. The LEDs 32 arranged on the wiring board 31 are arranged in a housed state in the hole 48 of the movable contact body with a light guide sheet and below the base sheet 41 portion extending in the hole 48. Yes. It is to be noted that the center position in the top view where the light emitting element 32A of the LED 32 is disposed is exposed from the opening 41B of the base sheet 41 in the top view, as in the above-described configuration. And the base sheet 41 site | part in the said hole 48 is affixed on the LED32 upper surface periphery position via the adhesive 41A. Here, since the base sheet 41 part covers the position around the upper surface of the LED 32, the base sheet 41 is bent slightly upward according to the height direction dimension of the LED 32, but the base sheet 41 bent upward is provided. The upper surface of the part does not come into contact with the upper second reflection sheet 30 and has a predetermined gap.

  An operation panel including an operation button 14 and a panel case 15 is disposed above the panel switch.

  Next, the operation and the like will be described, but the switch on / off operation is the same as described above, and will be omitted.

  When the LED 32 emits light, the light irradiated above the LED 32 is surrounded by the lower surface of the second reflective sheet 30 and the upper surface of the base sheet 41 in the hole 48 through the opening 41B in the hole 48. Enter the space. Then, in the space surrounded by the lower surface of the second reflection sheet 30 and the upper surface of the base sheet 41 part, the light propagates in a direction parallel to the wiring substrate 31 while repeating reflection, and becomes a hole 48 serving as a light incident portion. The light guide sheet 26 is taken into the light guide sheet 26 from the side end portion of the light guide sheet 26 that forms a part of the side surface, that is, from the side end portion of the through hole in the light guide sheet 26. Here, by appropriately setting the shape of the opening 41B, it is possible to adjust the intensity of the light from the LED 32 taken into the space, and the light of the LED 32 can be efficiently incident into the light guide sheet 26. The configuration is the same as that described above. Thus, in the component, the base sheet 41 portion located in the hole 48 corresponds to the first reflection sheet 29.

  If it is the said structure, since the 1st reflective sheet 29 of single-piece | unit structure is eliminated and it is integrated with the base sheet 41, it can comprise in a simple thing with few component parts, and can also reduce an assembly man-hour etc. Useful.

  Although the openings 29B and 41B are smaller than the upper surface shape of the LED 32 in the above, the present invention is not limited to this.

  In the above description, the number of the movable contacts 3 is two, and the LED 32 is accommodated in the holes 28 and 48. However, the number of the movable contacts, the number of the holes disposed, There are no particular restrictions on the shape.

  And if it is the said structure, since it should just have an area for arrange | positioning at least 1 LED32 as a magnitude | size of the hole parts 28 and 48, it is for accommodating two LED12A, 12B of side surface light emission. It can be made smaller than the conventional hole 8, which is also advantageous.

  Each of the reflection sheets 29 and 30 may be configured as described above by a method other than being adhered.

  And the idea by this invention may be applied also to the movable contact body with a light guide function of the structure which does not have the spacer sheet 24. FIG.

  The movable contact body with a light guide function according to the present invention has an advantageous effect that the light of the LED can be efficiently taken into the light guide sheet and the number of LEDs used can be reduced. In addition, it is useful for input operation units of various electronic devices.

3, 3A, 3B Movable contact 14 Operation button 14A Operation part 14B Press part 15 Panel case 21, 41 Base sheet 21A, 24A, 27, 29A, 30A, 41A Adhesive 24 Spacer sheet 25 Movable contact accommodating hole 26 Light guide sheet 26A Base material 26B Protrusion 28, 48 Hole 29 First reflection sheet 29B, 41B Opening 30 Second reflection sheet 31 Wiring board 31A Outer fixed contact 31B Central fixed contact 32 LED
32A light emitting device

Claims (2)

A base sheet made of an insulating film that holds a movable contact made of an elastic thin plate metal below, and a flexible guide that is arranged above the base sheet and guides incident light within the base made of insulating film. A movable contact body with a light guide function provided with a light sheet, wherein the light guide sheet is provided with a through hole, and the through hole is provided on a lower surface side of the light guide sheet corresponding to the position of the through hole. A first reflecting sheet having an opening smaller than the hole, and a second reflecting sheet for closing the through hole on the upper surface side of the light guide sheet in correspondence with the position of the through hole; A movable contact body with a light guide function, characterized by 2. Instead of arranging the first reflection sheet, a part of the base sheet is arranged at a lower position in the through hole of the light guide sheet, and the part functions as the first reflection sheet. Movable contact body with light guiding function.

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