JP5402652B2 - Panel lighting device and panel unit provided with the same - Google Patents

Description

  The present invention relates to a panel illuminating device for illuminating a plurality of panels provided in a passenger compartment of an automobile from the back side thereof, and a panel unit including the same.

  Conventionally, as an apparatus for illuminating a panel provided in a passenger compartment of an automobile, for example, the one shown in FIG. 13 is known (Patent Document 1).

  In the figure, a plurality of push buttons 102 are arranged on a panel (escussion) 100, and an illumination device 104 that illuminates each of the push buttons 102 is disposed on the back side of the panel 100. The illuminating device 104 includes a circuit board 106, a plurality of illumination light sources (lamps) 108 mounted thereon, and a light guide for guiding light emitted from the illumination light sources 108 to the push buttons 102. 110. The number of the illumination light sources 108 is smaller than the number of the push buttons 102, and the shape of the light guide 110 is set so that the light from the illumination light sources 108 is distributed to the push buttons 102.

  On the other hand, a rubber sheet 112 is disposed on the front side surface (panel side surface) of the circuit board 106. The rubber sheet 112 includes a rubber switch portion 114 located on the back side of each push button 102. These rubber switch portions 114 together with the circuit board 106 constitute a push switch. Specifically, the rubber switch portion 114 is formed so as to be displaceable in the normal direction of the circuit board 106 with respect to the other portions of the rubber sheet 112, and a movable contact is provided on the back surface thereof. On the circuit board 106, a fixed contact (not shown) facing the movable contact is provided. When the push button 102 is pressed, the rubber switch portion 114 is displaced in the pressing direction together with the push button 102, so that the movable contact and the fixed contact come into contact with each other, and the switch signal is switched from OFF to ON.

Japanese Utility Model Publication No. 5-53070

  In the above-described apparatus, a light guide 110 must be added to distribute the light emitted from each illumination light source 108 to each push button 102, which is a plurality of illumination target parts having a larger number, and this addition is required. Is accompanied by an increase in the size of the entire apparatus. In addition, since the light guide 110 is formed as a lump with a light-transmitting resin such as acrylic resin or polycarbonate, an increase in the total weight of the apparatus due to the addition of the light guide 110 cannot be ignored.

  In view of such circumstances, the present invention provides an illuminating device capable of efficiently illuminating a plurality of portions of a panel from the back side while suppressing an increase in size and weight of the entire device, and a panel unit including the same. The purpose is to do.

  The present inventors paid attention to a rubber sheet interposed between a panel and a circuit board as a means for solving the above-mentioned problems. This rubber sheet is frequently used for various purposes such as light shielding and waterproofing by the close contact with the partition wall formed on the back side of the panel, in addition to the introduction of the rubber switch portion as described above. The present invention uses this rubber sheet for light guide, and enables efficient illumination without causing a significant increase in the number of components.

  Specifically, a panel illumination device according to the present invention is for illuminating a plurality of illumination target parts set on a panel from the back side, and a circuit board provided on the back side of the panel, and the circuit board A light source for illumination that emits light for illuminating the illumination target portion, mounted on a smaller number of locations than the illumination target portion on the front side that is a surface facing the panel, and on the front side of the circuit board And a rubber sheet laid on. The rubber sheet has a shape including a reflection surface that reflects the light emitted from the illumination light source so as to guide the light to the illumination target part.

  In this apparatus, since the light from the illumination light source is guided to the illumination target part by using a rubber sheet provided on the circuit board, it is possible to omit or simplify the special light guide. . In addition, the rubber sheet is lighter than a conventional light guide, and there is almost no increase in weight due to a change in its shape. Accordingly, it is possible to efficiently illuminate a plurality of illumination target portions set on the panel using a smaller number of illumination light sources while suppressing an increase in size and weight of the entire apparatus.

  Of the surface of the rubber sheet, the surface constituting the reflective surface is preferably a surface other than the reflective surface and having a higher light reflectance than the surface facing the panel side. This reflectance setting is more efficient by suppressing the reflection of light from the front surface of the rubber sheet and facilitating the light reflection on the reflection surface while making the presence of the rubber sheet itself inconspicuous. It is possible to realize illumination. Specifically, the surface constituting the reflective surface is a surface other than the reflective surface and has a high brightness color or a small surface roughness compared to a surface facing the panel side. Is preferable.

In the present invention, the shape of the rubber sheet is such that the reflection surface included in the rubber sheet reflects at least part of the light from the illumination light source toward the front side surface of the circuit board and Ru der and guides the illumination target portion by further reflecting the light. Thus, by using the front side surface of the circuit board as a reflection surface, the degree of freedom in design is greatly expanded.

More specifically, the rubber sheet has a shape having a dispersion reflection portion interposed between a specific illumination light source and the panel, and the dispersion reflection portion faces the front side of the circuit board in different directions. A plurality of reflecting surfaces facing each other, and having a shape that allows at least a part of light reflected in different directions by the reflecting surfaces to be reflected on the front side surface of the circuit board and then toward different illumination target portions. . Although this shape is a simple one in which a plurality of reflecting surfaces are concentrated at a position between the illumination light source and the panel, the light emitted from the illumination light source is efficiently dispersed to the plurality of illumination target portions. Make it possible.

  Moreover, this invention is equipped with the panel by which the several illumination object part was set, and the panel illumination apparatus which illuminates each said illumination object part from the back side of this panel, and this panel illumination apparatus is a panel which consists of said panel illumination apparatus. Provide units.

  As this panel unit, for example, at least a part of the illumination target part is set to a push button provided on the panel, and the rubber sheet receives a pressing force from the push button and the other part of the rubber sheet. It is preferable to include a rubber switch portion that can be displaced relative to the reflective surface at a position adjacent to the reflective surface. In this panel unit, the rubber sheet can be used as a pressing switch constituting body and a light guide body, and a rubber switch portion for functioning as the pressing switch and a reflecting surface for functioning as the light guide body are provided. By concentrating on the specific area, it is possible to reduce the required area of the rubber sheet.

  As described above, according to the present invention, by including a reflective surface in the rubber sheet, the rubber sheet can be used as a light guide material for illumination, thereby significantly increasing the size and weight of the entire apparatus. There is an effect that a plurality of illumination target portions on the panel can be efficiently illuminated using a smaller number of illumination light sources.

It is a front view of the panel unit which concerns on the 1st Embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is a cross-sectional perspective view which shows the principal part of the said panel unit. It is a perspective view of the rubber sheet contained in the panel unit. It is sectional drawing which shows the principal part of the panel unit which concerns on the 2nd Embodiment of this invention. (A) is the sectional view on the 8A-8A line of (b), (b) is a front view of the panel unit which concerns on the 3rd Embodiment of this invention. (A) is a front view which shows the principal part of the panel unit which concerns on the 3rd Embodiment of this invention, (b) is the side view. It is the XX sectional view taken on the line of Fig.9 (a). It is the XI-XI sectional view taken on the line of Fig.9 (a). It is a perspective view of the rubber sheet contained in the panel unit which concerns on the 3rd Embodiment of this invention. It is a perspective view which shows the example of the conventional panel illuminating device.

  A first embodiment of the present invention will be described with reference to FIGS.

  1 to 5 show a panel unit according to this embodiment. The panel unit includes a panel 10, a panel illumination device 12 disposed on the back side thereof, and a rear cover 14 that further covers the panel illumination device 12 from the back side.

  The panel 10 includes a panel main body 16 and a plurality of push buttons arranged on the panel main body 16. In this embodiment, a total of six push buttons 18A, 18B, 18C, 18D, 18E, and 18F are arranged in three horizontal rows and two vertical rows, and are held together by the panel body 16. The push buttons 18A to 18F are an operated portion that is operated by a finger or the like, and a pair of left and right pressing operation portions 19 that extend from the back surface of the operated portion to the back side (the circuit board 20 side; the lower side in FIG. 3). And integrally.

  The whole or part of each of the push buttons 18A to 18F is made of a material that can transmit light to the front side of the panel 10, and constitutes an illumination target part. And the said panel illumination device 12 illuminates these illumination object parts from the back side. That is, in this panel unit, a total of six illumination target portions are set on the panel 10.

  The panel body 16 allows the push buttons 18A to 18F to be moved back in the pressing direction when any one of the push buttons 18A to 18F is pressed. Hold.

  In this embodiment, as shown in FIG. 4, the upper push buttons 18A to 18C, the support wall 17A extending in the arrangement direction (lateral direction) on the upper side, the support wall 17A and the push buttons 18A. A plurality of hinge portions 17a connecting to each other to 18C are integrally formed as a single component, and each push button 18A to 18C is rotated with the hinge portion 17a as a fulcrum while elastically deforming each hinge portion 17a. By moving, the push buttons 18 </ b> A to 18 </ b> C can be displaced between the normal position shown in FIG. 4 and the press position where the push button 18 </ b> A receives the pressure from the normal position and moves backward. Similarly, the lower push buttons 18D to 18F, the support wall 17B extending in the arrangement direction (lateral direction) on the lower side, and the support wall 17B and the plurality of push buttons 18D to 18F are connected to each other. The hinge portion 17b is integrally formed as a single component, and the push buttons 18D to 18F rotate with the hinge portion 17b as a fulcrum while being elastically deformed. 18D to 18F can be displaced between the normal position shown in FIG. 4 and the pressing position that receives the pressing from the normal position and moves backward. Further, the support walls 17A and 17B are in close contact with the surface of the rubber sheet 24, so that light leaks (blocks) to other regions.

  In addition, the specific support structure of each push button 18A-18F is not restricted to this. For example, the panel body 16 may directly hold each push button so that it can slide in a direction parallel to the pressing direction. Moreover, the panel which concerns on this invention is not restricted to the thing containing the said push button, What is necessary is just the thing by which the illumination object part was set to the several location at least. For example, an illumination target part such as a display window may be provided directly on the panel body 16.

  The panel illumination device 12 includes a circuit board 20, a plurality of illumination light sources (LEDs 22 in this embodiment) mounted on the circuit board 20, and a front side surface of the circuit board 20 (facing the panel 10 side). Surface: a surface facing upward in FIGS. 2 and 3) and a rubber sheet 24 laid on 20a.

  The circuit board 20 includes a board body disposed on the back side of the panel body 16, a conductor pattern disposed on the surface of the board body, and a plurality of circuit elements mounted on the board body. These constitute an electronic circuit, and the electronic circuit is connected to an external circuit (for example, an in-vehicle circuit) via a connector (not shown). The electronic circuit includes a circuit for lighting each LED 22 and a switch circuit that is turned on / off in conjunction with a pressing operation of the push button.

  Each of the LEDs 22 is mounted at a plurality of positions arranged on the front side surface 20a of the circuit board 20, which is smaller than the number of push buttons that are illumination target portions. In this embodiment, the LEDs 22 are arranged at positions (a total of four positions) that are just behind the positions between the push buttons that are adjacent to each other in the lateral direction.

  The number of locations where the LEDs 22 are disposed should be smaller than the number of illumination target portions, for example, one. A specific arrangement location (arrangement position) may be set as appropriate. The gist of the present invention is to efficiently illuminate a plurality of illumination target portions set on a panel by effectively using a rubber sheet 24 described later while using a smaller number of illumination light sources.

  The rubber sheet 24 includes a plurality (twelve in this embodiment) of rubber switch portions 26 respectively corresponding to the left and right pressing operation portions 19 of the push buttons 18A to 18F. These rubber switch portions 26 each constitute a push switch in cooperation with the circuit board 20.

  Specifically, each rubber switch portion 26 includes a movable portion 27 and a thin portion 28 formed around the movable portion 27. The movable portion 27 has a cylindrical shape in this embodiment, and is formed at a position where it can come into contact with the back surface of the pressing operation portion 19 of each of the push buttons 18A to 18F. The thin portion 28 has a substantially conical shape that connects the movable portion 27 and the main body portion of the rubber sheet 24 located around the movable portion 27. The movable portion 27 has an original shape that holds the movable portion 27 in a non-deformed state at a position where the back surface of the movable portion 27 floats to the front side (panel 10 side) from the back surface of the other rubber sheet 24. When a push button corresponding to the portion 27 (any one of the push buttons 18A to 18F) is pressed, the pressing operation portion 19 displaces (presses) the movable portion 27 toward the circuit board 20 side. It is elastically deformed to allow this.

  A movable contact (not shown) is provided on the back surface of the movable portion 27, and a fixed contact 30 is mounted on the front side surface 20 a of the circuit board 20 at a position facing the movable contact. The movable portion 27 is displaced toward the circuit board 20 by pressing a corresponding push button, thereby bringing the movable contact provided on the back surface of the movable portion 27 into contact with the fixed contact 30, thereby Turn the signal from off to on.

  The original use (purpose of arrangement) of the rubber sheet according to the present invention is not limited to the construction of the rubber switch section as described above. For example, the rubber sheet may be laid on a circuit board for the purpose of light shielding and waterproofing. Specifically, the rubber sheet is constructed so as to construct a light shielding structure or a waterproof structure by closely contacting an end face of a light shielding or waterproof vertical wall extending from the back surface of the front side wall of the panel body to the circuit board 20 side. Even when a sheet is provided, the present invention can be effectively applied.

  As shown in FIGS. 2 and 3, the rubber sheet 24 according to this embodiment includes a plurality of positioning protrusions 32 that protrude from the back surface to the circuit board 20 side. These positioning protrusions 32 are press-fitted into through holes provided in the circuit board 20 to fix the relative position of the rubber sheet 24 with respect to the circuit board 20.

  On the other hand, the rear cover 14 is attached to the panel body 16 with the circuit board 20 being sandwiched between the rear cover 14 and the panel body 16, thereby holding the circuit board 20 in a proper position.

  As a feature of the rubber sheet 24 according to the first embodiment, the rubber sheet 24 is configured to guide the light emitted from the LEDs 22 (hereinafter referred to as “illumination light”) to the illumination target portion. It has a shape that includes a reflective surface that reflects light. Specifically, the rubber sheet 24 includes a pair of upper and lower frame walls 33 formed corresponding to the row of the upper push buttons 18A to 18C and the row of the lower push buttons 18D to 18F, and each frame wall 33. And a plurality of dispersion reflecting portions 34 and a plurality of outer reflecting walls 36 formed respectively inside.

  Each frame wall 33 rises from the main body portion (sheet-shaped portion) of the rubber sheet 24 to the panel 10 side (front side), and an array of corresponding push button groups (push buttons 18A to 18C or push buttons 18D to 18F). It has a shape extending in the direction (lateral direction), and surrounds a space in which the optical path of the illumination light can be formed.

  The dispersion reflecting portion 34 has a first reflecting surface 34a and a second reflecting surface 34b that are located between the LEDs 22 and the panel 10 and face the circuit board 20 side. These reflecting surfaces 34a and 34b are surfaces for reflecting the light emitted from the LED 22, and are directed in different directions, and the ridge line that is the boundary between them is directly on the front side of the LED 22 (directly above in FIG. 2). positioned. Of the reflecting surfaces 34a and 34b, the first reflecting surface 34a faces the outside of the arrangement direction (lateral direction) of the push buttons 18A to 18C and the push buttons 18D to 18F (both left and right outside in FIG. 2). The second reflecting surface 34b is inclined at an appropriate angle with respect to the front surface 20a of the 20, and the front surface of the circuit board 20 is directed to the inner side of the arrangement direction (lateral direction) of the push buttons 18A to 18C and the push buttons 18D to 18F. The side surface 20a is inclined at an appropriate angle on the opposite side of the first reflecting surface 34a.

  Each of the outer reflection walls 36 is located on the back side of a total of four push buttons 18A, 18C, 18D, and 18F located on both left and right sides of the six push buttons 18A to 18F. The inner side surface constitutes the outer reflecting surface 36a. The outer reflecting surface 36a is also a surface for reflecting illumination light, and the circuit board 20 is arranged in such a direction that the end (back side end) on the circuit board 20 side is located on the inner side of the panel 10 side (front side end). Inclined by a predetermined angle with respect to the normal direction.

  As shown in FIGS. 2 and 5, a center opening 38B that opens toward the central push buttons 18B and 18E among the push buttons is formed between the two dispersion reflecting portions 34, and both the dispersion reflections are made. An outer opening 38A that opens toward the push buttons 18A, 18C, 18D, and 18F located on both outer sides in the lateral direction is formed between the portion 34 and the outer reflecting wall 36 located on the outer side. Yes.

  In the rubber sheet 24, the positions and inclination angles of the reflecting surfaces 34a, 34b, 36a are set so as to form an optical path of illumination light as shown by a broken line in FIG. That is, each reflecting surface is set to have the following action.

  a) The first reflecting surface 34a reflects light (illumination light) emitted from the corresponding LED 22 toward the outer reflecting surface 36a. The outer reflecting surface 36a reflects the illumination light reflected by the first reflecting surface 34a or the illumination light directly emitted from the LED 22 toward the outer opening 38A, and is a push button (push button 18A) that is a corresponding illumination target portion. , 18C, 18D, or 18F).

  b) The second reflection surface 34 b reflects light (illumination light) emitted from the corresponding LED 22 toward the front side surface 20 a of the circuit board 20. The front side surface 20a further reflects the illumination light to reach the push button (the push button 18B or the push button 18E) that is the central illumination target portion through the center opening 38B.

  That is, in this embodiment, the second reflecting surface 34b reflects the illumination light toward the front side surface 20a of the circuit board 20, so that the front side surface 20a is also used as a reflecting surface for the illumination light. Similarly, the first reflective surface 34a may also utilize the front side surface 20a as a reflective surface by reflecting illumination light toward the front side surface 20a.

  As described above, in this apparatus, since the light from the LED 22 is guided to the illumination target part by using the rubber sheet 24 provided on the circuit board 20, a special light guide is omitted or simplified. It is possible. Moreover, the rubber sheet 24 is lighter than conventional light guides (for example, those made of a lump of synthetic resin), and there is almost no increase in weight due to a change in shape. Therefore, while suppressing an increase in the size and weight of the entire apparatus, a plurality of illumination target parts (six push buttons 18A to 18F in this embodiment) set on the panel 10 are used in a smaller number of illumination light sources. (In this embodiment, four LEDs 22) can be used for efficient illumination.

  In particular, in the case where at least a part of the illumination target portion is set as a push button as in the panel unit according to this embodiment, the rubber sheet 24 receives a pressing force from the push button and the other rubber sheet 24 is received. It is possible to include a rubber switch portion 26 capable of relative displacement with respect to this portion at a position adjacent to the reflecting surfaces 34a, 34b, 36, and this arrangement reduces the required area of the rubber sheet 24. to enable.

  Further, in this apparatus, the light reflection rate of the surface of the rubber sheet 24 that constitutes the reflection surfaces 34a, 34b, 36 is at least a surface other than the reflection surface and facing the panel 10 side. Is preferably high. The setting of this reflectance is achieved by promoting the light reflection at each of the reflection surfaces 34a, 34b, 36a while suppressing the reflection of light from the surface on the front side of the rubber sheet 24 so that its presence is not noticeable. It is possible to achieve highly efficient lighting. Specifically, the surface constituting the reflective surface is colored so as to have a high brightness color (for example, white or yellow) compared to a surface other than the reflective surface and facing the panel side, Or it is preferable to shape | mold so that it may have a smaller surface roughness.

  Further, when the front side surface 20a of the circuit board 20 is also used as a reflecting surface as in this embodiment, the same processing for promoting light reflection (for example, white or yellow coloring or In addition, when the rubber sheet 24 has the frame wall 33 as in this embodiment, the inner surface of the frame wall 33 is similarly subjected to the light reflection promotion process. Then, the illumination light incident on the frame wall 33 from the circuit board 20 side is reflected on the panel 10 side by the inner side surface of the frame wall 33, so that the illumination efficiency can be further improved.

  In the present invention, the specific number, position, shape and the like of the reflecting surface, and the number and arrangement of the illumination light sources may be appropriately set according to the number and position of the illumination target portions. For example, as shown in FIG. 7 as the second embodiment, when four push buttons 18G, 18H, 18I, and 18J are arranged in one direction as the illumination target portion, the space between adjacent push buttons If the LEDs 22 and the dispersion reflectors 34 are respectively arranged at the positions of (2) and the central openings 38B are respectively formed between the adjacent dispersion reflectors 34, the first Similarly to the embodiment, each illumination target part (four push buttons 18G to 18J) can be illuminated with a smaller number of illumination light sources (three LEDs 22).

  Furthermore, it is also possible to illuminate a plurality of illumination target portions with a single illumination light source, depending on the arrangement of the illumination target portions and the amount of light of the illumination light source. An example thereof is shown in FIGS. 8 to 12 as a third embodiment.

  The panel unit according to this embodiment also includes a panel 10, a panel illumination device 12 arranged on the back side thereof, and a rear cover 14 that further covers the panel illumination device 12 from the back side. And a plurality of push buttons arranged on the panel body 16.

  In this embodiment, a total of four push buttons 18K, 18L, 18M, and 18N are arranged in two horizontal rows and two vertical rows. Similar to the first embodiment, each push button integrally includes an operated part that is operated by a finger or the like and a pair of left and right pressing operation parts 19 that extend from the back surface of the operated part to the back side, The entire surface or a part of each push button is made of a material that can transmit light to the front side of the panel 10 to constitute an illumination target portion. And the said panel illumination device 12 illuminates these illumination object parts from the back side. That is, in this panel unit, a total of four illumination target portions are set on the panel 10.

  The push buttons 18K to 18N are collectively held in the panel body 16 so as to be displaceable as in the first embodiment. Specifically, the support wall 17 extending in the lateral direction at the position between the push buttons 18K to 18N, the upper push buttons 18K, 18L and the lower push buttons 18M, 18N, and the support wall 17 And the plurality of hinge portions 17c respectively connecting the push buttons 18K to 18N are integrally formed as a single component. And each push button 18K-18N rotates by using the hinge part 17c as a fulcrum with elastic deformation of each hinge part 17c, so that the push buttons 18K-18N are in the normal position shown in FIG. It is possible to displace between the pressing position that receives the pressure from the back and moves backward.

  Also in this embodiment, the push buttons 18K to 18N may be directly held by the panel body 16 so as to be slidable in a direction parallel to the pressing direction, for example. Further, even when other illumination target parts are provided in the panel body 16 in the same arrangement instead of the push buttons 18K to 18N, the illumination target parts are all illuminated with a single illumination light source as described later. Is possible.

  The panel illumination device 12 includes a circuit board 20, an illumination light source (LED 22), and a rubber sheet 24 similar to those of the first embodiment. In this embodiment, each push button is formed by a single LED 22. Illumination of 18K-18N is performed. Specifically, the LED 22 according to this embodiment is disposed at a position just behind the center point that is the boundary between the full push buttons 18K to 18N arranged vertically and horizontally.

  Similarly to the first embodiment, the rubber sheet 24 includes a plurality (eight in this embodiment) of rubber switch portions 26 respectively corresponding to the left and right pressing operation portions 19 of the push buttons 18A to 18F. , And a positioning protrusion (not shown). Each rubber switch part 26 is comprised of a movable part 27 and a thin part 28 as in the first embodiment, and constitutes a pressure switch in cooperation with the fixed contact 30 on the circuit board 20 side.

  The rubber sheet 24 according to the third embodiment disperses the illumination light emitted from the central single LED 22 in its four directions, and pushes the push buttons 18K, 18L, 18M, and 18N as a plurality of illumination target portions. Has a guiding shape. Specifically, as in the first embodiment, the rubber sheet 24 has a frame wall 33 that surrounds a space that rises from the main body portion toward the panel 10 and that can form the optical path of the illumination light therein. However, the frame wall 33 has a substantially X-shape extending from the central position where the LED 22 is disposed to the left diagonally upper, right diagonally upper, left diagonally lower, and right diagonally lower, and further, The terminal portion 33a (FIG. 12) has a shape extending outward in the lateral direction.

  Further, a dispersion reflection portion 40 is formed at the center portion of the frame wall 33, and an outer reflection wall 36 is formed at each end portion 33a. The dispersion reflecting portion 40 is positioned so as to be interposed between the LED 22 and the panel 10, and has four reflecting surfaces 42K, 42L, 42M, and 42N arranged around the center point thereof. These reflecting surfaces 42K, 42L, 42M, and 42N are surfaces for reflecting the light emitted from the LED 22 so as to disperse the light toward the push buttons 18K, 18L, 18M, and 18N, respectively. Direction toward the button 18K (upward diagonally left), direction toward the push button 18L (upward diagonal right), direction toward the push button 18M (down diagonal left), and direction toward the push button 18N (down diagonal right) ) With respect to the direction parallel to the circuit board 20 by an appropriate angle.

  Each of the outer reflection walls 36 is formed at a position on the back side of each of the push buttons 18K, 18L, 18M, and 18N in each terminal portion 33a of the frame wall 33, and the inner side surface thereof constitutes the outer reflection surface 36a. . The outer reflective surface 36a is also a surface for reflecting illumination light, and the end (back side end) on the circuit board 20 side of the outer reflective surface 36a is located inside the panel 10 side (front side end). The direction is inclined by a predetermined angle with respect to the normal direction of the circuit board 20.

  As shown in FIGS. 10 to 12, outside openings 38K, 38L, 38M, and 38N that open toward the push buttons 18K, 18L, 18M, and 18N are formed outside the four ends of the dispersion reflecting portion 40. Each is formed.

  In the rubber sheet 24, the positions and inclination angles of the reflecting surfaces 42K to 42N and 36a are set so as to form an optical path of illumination light as indicated by a broken line in FIG. That is, each reflecting surface is set to have the following action.

  a) Each of the reflecting surfaces 42K, 42L, 42M, and 42N of the dispersion reflecting portion 40 reflects the illumination light emitted from the LED 22 in a direction inclined toward the push buttons 18K, 18L, 18M, and 18N. It reaches the front side surface 20a of the circuit board 20, and is directed to the terminal portion 33a of the frame wall 33 located on the back side of each push button 18K to 18N by further reflection on the front side surface 20a. That is, the illumination light from the LED 22 is dispersed in a direction approaching each push button 18K, 18L, 18M, 18N.

  b) The outer reflection surface 36a in each terminal portion 33a reflects the illumination light coming from the reflection on the front side surface 20a of the circuit board 20 to the panel 10 side (front side), and the illumination light is transmitted to the terminal end The push buttons 18K, 18L, 18M, and 18N located on the front side of the portion 33a are reached.

  That is, also in the third embodiment, each of the reflecting surfaces 42K to 42N of the dispersion reflecting portion 40 reflects the illumination light toward the front side surface 20a of the circuit board 20, so that the front side surface 20a also reflects the illumination light. Used as a reflective surface.

  As described above, in the apparatus according to the third embodiment, the light emitted from the single LED 22 is distributed to the four push buttons 18K to 18N located in the oblique four directions, so that these push buttons are Since 18K-18N is illuminated, more efficient illumination can be realized.

  Also in the third embodiment, similarly to the first embodiment, the surface for reflecting the illumination light, that is, the reflection surfaces 42K to 42N, 36a of the rubber sheet 24 and the front side surface 20a of the circuit board 20 are used. It is more preferable that a treatment for promoting light reflection is applied. Further, it is also preferable that the inner side surface of the frame wall 33 is similarly subjected to a light reflection promoting process.

DESCRIPTION OF SYMBOLS 10 Panel 12 Panel illumination apparatus 16 Panel main body 18A-18N Push button 20 Circuit board 20a Front side 22 LED (lighting source for illumination)
22a Front side surface 24 Rubber sheet 26 Rubber switch part 33 Frame wall 34 Dispersion reflection part 34a 1st reflection surface 34b 2nd reflection surface 36a Outer reflection surface 40 Dispersion reflection part 42K-42N Reflection surface

Claims (5)

A panel illumination device for illuminating a plurality of illumination target parts set on a panel from the back side,
A circuit board provided on the back side of the panel;
A light source for illumination that emits light for illuminating the illumination target part, mounted in a smaller number of places than the illumination target part on the front side that is the surface facing the panel side of the circuit board,
A rubber sheet laid on the front side surface of the circuit board, and the rubber sheet has a shape including a reflection surface that reflects the light so as to guide the light emitted from the illumination light source to the illumination target part. Chi also,
In the rubber sheet, the reflection surface included in the rubber sheet reflects at least a part of the light from the illumination light source toward the front side surface of the circuit board and further reflects the light on the surface side. And having a shape leading to the illumination target part,
The rubber sheet has a shape having a dispersion reflecting portion interposed between a specific illumination light source and the panel, and the plurality of reflecting surfaces face the front side surface of the circuit board in different directions. And at least a part of the light reflected by the reflecting surface in different directions is reflected from the front side surface of the circuit board and then directed to different illumination target parts. Panel lighting device. The panel lighting device according to claim 1,
Of the surface of the rubber sheet, a surface constituting the reflection surface has a higher light reflectance than a surface other than the reflection surface and facing the panel side. The panel lighting device according to claim 2,
The surface constituting the reflection surface is a surface other than the reflection surface and has a high brightness color or a smaller surface roughness than a surface facing the panel side. apparatus. A panel with a plurality of lighting target parts set;
Panel unit, characterized by a panel illumination device for illuminating the respective illumination object part from the rear side of the panel, the panel lighting device consists of panel illumination device according to any one of claims 1-3. The panel unit according to claim 4 ,
At least a part of the illumination target part is set to a push button provided on the panel, and the rubber sheet of the panel illumination device receives a pressing force from the push button to the other part of the rubber sheet. A panel unit comprising a rubber switch portion capable of relative displacement at a position adjacent to the reflecting surface.

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