JPH0531040U - Lighting structure for electronic devices - Google Patents

Abstract

(57) [Summary] [Object] To provide an illumination structure for an electronic device, which can simplify the manufacturing process, reduce the number of parts, and obtain high-luminance illumination light with a uniform distribution. [Structure] A sheet body 24 and a shield plate 28 are stacked on a wiring board 18. The shield plate is formed to have a white color from the silicone rubber and the white pigment, and the light traveling from the light source 32 toward the wiring board 18 is reflected by the surface 24 a of the sheet body 24 toward the light passage area 36 of the front plate 11 to emit light. The passage area 36 is caused to emit light with high brightness.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for illuminating a front plate of an electronic device such as an on-vehicle audio device from the back side.

[0002]

[Prior Art]

 In order to improve usability at night, in-vehicle electronic devices such as in-vehicle audio devices are equipped with various operation buttons and knobs located on the front panel of the electronic device, such as the circular front end. Light is emitted from the light source located on the rear side of the front plate by making the peripheral part of the ring transparent and the remaining part light-shielding so that the contours of the button or knob are highlighted at night. The arranging positions of the operation buttons and operation knobs are made clear to improve usability. The following means are used to improve the brightness when viewed from the front side in the annular illumination portion such as the peripheral portion of the front side end of the operation button.

(1) White printing is performed on the front plate side surface of a wiring board which is arranged behind the front plate and on which a light source such as an LED (light emitting diode) or a pilot lamp is mounted, or a white sheet. Stick the body.

(2) Printing on a wiring board in order to achieve insulation between circuit wirings formed on an insulating board or insulation between circuit elements and circuit wirings arranged around the circuit wirings. An insulating layer having a smooth surface and gloss is formed, and a light reflecting layer is also formed near the installation position of the light source.

[0005]

[Problems to be solved by the device]

 In the case of the first conventional example, it is necessary to add the step of printing the white color paint in addition to the normal manufacturing step of the electronic device, and the step of attaching the white sheet body is required. .. For this reason, the manufacturing process becomes complicated and the number of parts also increases. On the other hand, in the second conventional example, the light reflection layer formed on the wiring board near the light source is formed of the same material and in the same process when the insulating layer is formed. It is impossible to print the mounting hole by covering it. Therefore, in the technique of printing like this, a region where light is not reflected locally occurs, and the reflected light becomes uneven. Have

An object of the present invention is to solve the above technical problems, simplify the manufacturing process, reduce the number of necessary parts, and obtain an illumination light with a uniform distribution. It is to provide a lighting structure.

[0007]

[Means for Solving the Problems]

 The present invention has a structure in which a light source is provided on a wiring board arranged behind a front plate of an electronic device to illuminate the illumination area of the front plate from the rear side. A conductor that conducts between the above specific terminals is formed on the surface of the raised portion on the wiring board side, and a sheet body made of a material that has elasticity and electrical insulation and reflects light is arranged in the range including the illumination area. It is a lighting structure for electronic equipment characterized by being operated.

[0008]

[Action]

 In the electronic device according to the present invention, a wiring board is arranged behind the front plate of the electronic device, a light source is provided toward the front plate on the wiring board, and the illumination area of the front plate is illuminated from the rear side. At this time, between the front plate and the wiring board, a conductor that conducts between specific terminals on the wiring board is formed on the surface of the raised portion on the wiring board side, and has elasticity and electrical insulation and reflects light. A sheet body made of a material is arranged in a range including the illumination area. That is, when the raised portion of this sheet body is pressed through the front plate, the conductor is connected across a plurality of specific terminals on the wiring board, and the specific terminals are electrically conducted. Can pass through.

By forming such a sheet body from a light-reflecting material, of the light emitted from the light source, the light traveling toward the wiring board is reflected by the sheet body, and the light in the illuminated area of the front plate is reflected. The brightness can be significantly improved. This sheet body is already incorporated as a so-called sheet switch in the normal assembly process of electronic equipment.Therefore, such a light-reflecting member can be prepared as a dedicated separate component, or The situation in which it is formed on the wiring board in a dedicated process is prevented, and it is possible to simplify the manufacturing process and reduce the number of parts. Even if the wiring board has through holes for mounting components, this sheet body is formed by covering it, so that a uniform and high-intensity distribution of illumination light is realized on the wiring board. can do.

[0010]

【Example】

 1 is a cross-sectional view of a front plate 11 of an on-vehicle sound reproducing device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the front plate 11 of the present embodiment, and FIG. It is sectional drawing which shows a structure. This sound reproducing device is embedded in a console or an instrument panel of a car and receives ratio broadcasts and reproduces magnetic tapes or CDs.

The front plate 11 has a compact disk (CD) insertion slot 12, a magnetic tape insertion slot 13 and a display window 14 as well as a large number of button holes 15 and insertion holes 16 such as a volume shaft. .. A push button type or seesaw type button member 17 is fitted into each of the button holes 15 as shown in an enlarged view in FIG.

A wiring board 18 is arranged on the rear surface 11 a side of the front plate 11, and a display device 19 realized by a liquid crystal display device or the like is provided on the wiring board 18 at a position corresponding to the display window 14. Will be implemented. Further, the wiring board 18 has insertion holes 20 and 21 formed at positions corresponding to the insertion holes 12 and 13, respectively, and insertion holes 22 formed at positions corresponding to the respective insertion holes 16.

On the surface 18 a of the wiring board 18, a plurality of contact patterns 23 forming a pair corresponding to the button members 17 are formed. These contact patterns 23 are wiring patterns (not shown) on the wiring board 18. It is connected to an unillustrated integrated circuit or the like on the wiring board 18 via. The sheet body 24 is arranged on the region where the contact patterns 23 are arranged. A plurality of insertion holes 31 are formed in the wiring board 18, and the screws 34 are screwed into the front plate 11 by inserting the insertion holes 31 of the wiring board 18.

The sheet body 24 includes a base material 25 made of a flexible material having electrical insulation and elasticity such as rubber as shown in the enlarged cross section of FIG. The back surface 27a of the raised portion 27 formed at a position corresponding to the pattern 23 is provided at a position corresponding to each of the contact patterns 23, and includes a contact member 26 made of a conductive material. Therefore, when any one of the button members 17 is pressed, the contact member 26 commonly contacts the pair of contacts 23a and 23b of the contact pattern 23 against the elastic force of the base material 25, and makes them conductive.

When the pressing force on the button member 17 is released, the button member 17 is returned to the position shown in FIG. 3 by the elastic force of the base material 25, and the contact member 26 is separated from the contact pattern 23. The contact points 23a and 23b are disconnected from each other. In this way, the switch operation is realized by using the contact pattern 23 and the contact member 26.

A shield plate 28, which is a conductive plate formed by pressing a material such as stainless steel, is arranged between the front plate 11 and the sheet body 24. Through holes 29 are formed in the shield plate 28 at positions corresponding to the contact patterns 23, that is, the raised portions 27 of the sheet body 24. Further, from the peripheral edge of the shield plate 28, other shield plates, vehicle bodies, etc. A connecting piece 30 for connecting to is integrally formed.

The character “A” shown in FIG. 2 is displayed on the front side of the front plate 11 as an example. For example, at night, this character is illuminated from the rear side by a light source 32 such as an LED provided on the wiring board 18. It is illuminated and emerges in a white state. That is, the front plate 11 is coated with, for example, black on the front surface of the base material 33 made of a transparent or milky white synthetic resin material or the like to form the light shielding layer 35. The light shielding layer 35 is removed by a laser beam or the like in a shape corresponding to the necessary display contents such as the character "A". Therefore, when the light source 32 emits light, the light from the light source passes only through the light passage area 36 which is the illumination area where the light shielding layer 35 is selectively peeled off, and the character "A" appears to shine.

The light source 32 is connected to the wiring board 18 by, for example, soldering, and the sheet body 24 and the shield plate 28 are formed with insertion holes 37 and 38 through which the light source 32 is inserted. In addition, the light source 32 is surrounded behind the base material 33 in a range corresponding to the light passage region 36, and light from the light source 32 does not leak in an undesired direction outside the light passage region 36. A light shielding member 39 that shields the light is disposed.

In this embodiment, the base material 25 of the sheet body 24 is used as an example, and is formed from a material in which a white pigment is mixed with silicon rubber. Such a material is flexible and electrically insulating, has a relatively rough surface texture, and exhibits a white color. As a result, the light from the light source 32 is reflected by the surface 24 a of the sheet body 24 as scattered light. Therefore, the brightness of the light passage region 36 can be remarkably improved as compared with the conventional example in which the sheet body 24 has a color of low brightness such as absorbing light from the light source 32 such as gray.

Moreover, the light from the light source 32 is transmitted while being scattered in the base material 33, and is also reflected while being scattered on the surface 24 a of the sheet body 24. This makes it possible to realize uniform illumination light without unevenness in brightness over the entire light passage region 36. Such an effect is realized by combining the contact pattern 23 and the contact member 26 on the wiring board 18 to make the surface of the sheet body 24 used as a sheet switch white. Therefore, it is not necessary to prepare a special part for reflecting the light from the light source 32, and the number of parts can be greatly reduced. Further, it is not necessary to provide a special process for forming such a reflection means, and the manufacturing process can be simplified.

FIG. 4 is a sectional view showing the structure of another embodiment of the present invention. The present embodiment is similar to the above-mentioned embodiment, and corresponding parts are designated by the same reference numerals. In the present embodiment, it is difficult to arrange the light source 32 provided on the wiring board 18 immediately below the light passage area 36 on the front plate 11, for various reasons. As shown in FIG. 36 is preferably carried out when it is arranged at a position slightly deviated from 36.

That is, the feature of the present embodiment is that the sheet body 24 faces the light source 32 at a portion immediately below the light passage region 36 and reflects the light from the light source 32 to the light passage region 36 side. As an example having the reflection surface 40, the triangular columnar reflection projection 41 is formed integrally with the sheet body 24. When forming the reflective protrusions 41, assuming that the sheet body 24 is formed of a plastic material having flexibility and electric insulation, the plastic material generally shrinks during the cooling period after molding. It is necessary to form a cavity in the reflective protrusion 41.

FIG. 5 is a cross-sectional view of a mold used to manufacture the reflective protrusion 41 from a plastic material and a rubber material. That is, when the sheet body 24 having the reflection protrusions 41 is formed from a plastic material, as shown in FIG. 5 (1), the pair of molds 42 and 43 used has a recess corresponding to the outer shape of the reflection protrusions 41. 44 and a protrusion 45 having a shape corresponding to the cavity formed inside the reflection protrusion 41 are required, respectively, which causes a problem that the structures of the molds 42 and 43 are complicated and the cost is increased. It

On the other hand, when the sheet body 24 is formed of a rubber material such as silicon rubber as described in the above-mentioned embodiment, it is known that the rubber material hardly shrinks during cooling after molding. Therefore, it is only necessary to form a recess 48 having a shape corresponding to the outer shape of the reflection projection 41 on one of the molds 46 and 47 to be used, and the other mold 47 has the projection 45 shown in FIG. Unnecessary. This simplifies the shapes of the dies 46 and 47, and can also reduce the cost.

The present invention is not limited to the in-vehicle sound reproducing device of the above-described embodiment, but is applicable to any device having a configuration in which the front plate is illuminated by the light source provided behind it.

[0026]

[Effect of the device]

 As described above, according to the present invention, the electronic device has the wiring board arranged behind the front plate of the electronic device, the light source is provided on the wiring board toward the front plate, and the illumination area of the front plate is provided. Illuminate from behind. At this time, a conductor that conducts between specific terminals on the wiring board is formed between the front plate and the wiring board on the surface of the raised portion on the wiring board side, and has elasticity and electrical insulation and reflects light. A sheet body made of a material is arranged in a range including the illumination area. That is, when the raised portion of the sheet body is pressed through the front plate, the conductor is connected across a plurality of specific terminals on the wiring board, and these specific terminals can be electrically connected. it can.

By forming such a sheet body from a light-reflecting material, of the light emitted from the light source, the light toward the wiring board side is reflected by this sheet body, and the light in the illuminated area of the front plate is reflected. The brightness can be significantly improved. This sheet body is already incorporated as a so-called sheet switch in the normal assembly process of electronic equipment.Therefore, such a light-reflecting member can be prepared as a dedicated separate component, or The situation in which it is formed on the wiring board in a dedicated process is prevented, and it is possible to simplify the manufacturing process and reduce the number of parts. Even if the wiring board has through holes for mounting components, the sheet is formed by covering it, so that a uniform and high-intensity distribution of illumination light is realized on the wiring board. be able to.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a front plate 11 according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view around a front plate 11 of the present embodiment.

FIG. 3 is a cross-sectional view showing a configuration of a sheet body 24.

FIG. 4 is a cross-sectional view of another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a mold used when forming the reflective protrusions 41 from a plastic material and a rubber material.

[Explanation of symbols]

 11 Front plate 11a Rear surface 18 Wiring board 23 Contact pattern 24 Sheet body 25 Base material 32 Light source 36 Light passage area 40 Reflecting surface 41 Reflecting protrusion 42, 43, 46, 47 Mold

Claims (1)

[Scope of utility model registration request] 1. A structure in which a light source is provided on a wiring board disposed behind a front plate of an electronic device to illuminate an illumination area of the front plate from the rear side, and wiring is provided between the front plate and the wiring board. A conductor that conducts between specific terminals on the board is formed on the surface of the raised portion on the wiring board side, and a sheet body made of a material that has elasticity and electrical insulation and reflects light is arranged in a range including the illumination area. A lighting structure for an electronic device, which is characterized in that