WO2013057755A1

WO2013057755A1 - Light leakage prevention structure

Info

Publication number: WO2013057755A1
Application number: PCT/JP2011/005815
Authority: WO
Inventors: 良太青木
Original assignee: 三菱電機株式会社
Priority date: 2011-10-18
Filing date: 2011-10-18
Publication date: 2013-04-25
Also published as: JPWO2013057755A1; JP5599518B2

Abstract

This light leakage prevention structure is equipped with ribs (15A, 15B) which are provided so as to surround a light source (14a) from an end face of a substrate (12) in order to block light from the light source (14a) and light that exits from the end face as the light from the light source (14a) transmits through the substrate (12).

Description

Light leakage prevention structure

This invention relates to the light leakage prevention structure of the electronic device which has design illumination.

As a conventional technique, for example, Patent Document 1 discloses a light leakage prevention structure in which a light-blocking elastic foam is provided so as to surround a switch body and light from a light source is prevented from leaking from the periphery of the switch.

Japanese Patent Laid-Open No. 2000-113760

In the conventional technique represented by Patent Document 1, an unintended portion through the light leakage path is provided by disposing a light shielding elastic foam or a rib serving as a light shielding wall between a structure serving as a light leakage path and a light source. A structure that prevents light leakage from the light is common.
However, a printed board such as a glass epoxy board, which is widely used in electronic equipment, is light-transmitting, so that light leakage occurs due to the light leakage path between the area where the wiring pattern is not applied and the end face of the board. There was a problem.
That is, even if a light shielding wall is placed around the light source mounted on the printed circuit board, if there is an area where no wiring pattern is applied between the light source and the light shielding wall, light from the light source passes through this area. Then, the light leaks from the end face of the printed circuit board, and unintended light leakage occurs.
Furthermore, in Patent Document 1, since it is necessary to newly provide a light-shielding elastic foam, the number of parts increases, and the manufacturing process becomes complicated accordingly.

The present invention has been made in order to solve the above-described problems, and provides a light leakage prevention structure capable of preventing light leakage due to light transmitted through a substrate on which a light source is mounted and emitted from an end surface thereof. For the purpose.

The light leakage prevention structure according to the present invention is a light leakage prevention structure for an electronic device including a substrate on which a light source is mounted and an illumination unit illuminated by light from the light source, and surrounds the periphery of the light source from the end surface of the substrate. And a light leakage prevention rib that shields light emitted from the light source and light emitted from the end surface through the substrate.

According to the present invention, there is an effect that light leakage due to light transmitted through the substrate on which the light source is mounted and emitted from the end face can be prevented.

It is a perspective view which shows the electronic device to which the light leakage prevention structure which concerns on Embodiment 1 of this invention is applied. It is the disassembled perspective view which decomposed | disassembled the structure of the front surface in the electronic device of FIG. It is the disassembled perspective view which looked at the structure of the sub panel from the front side. It is the disassembled perspective view which looked at the structure of the sub panel from the back side. It is the perspective view which looked at the composition of the sub panel from the back side. FIG. 5 is an enlarged view of region B in the case of a sub-panel to which a conventional light leakage prevention structure is applied. FIG. 5 is a cross-sectional view taken along line AA in the case of a sub-panel to which a conventional light leakage prevention structure is applied. It is a figure which shows the structure of the light source periphery part in the subpanel to which the conventional light leakage prevention structure is applied. It is a front view of a sub panel. FIG. 5 is an enlarged view of region B in the case where the sub-panel to which the light leakage prevention structure according to Embodiment 1 is applied. FIG. 5 is a cross-sectional view taken along the line AA when the sub-panel to which the light leakage prevention structure according to the first embodiment is applied. It is a figure which shows the structure of the light source periphery part in the sub panel to which the light leakage prevention structure which concerns on Embodiment 1 is applied.

Hereinafter, in order to describe the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
1 is a perspective view showing an electronic apparatus to which a light leakage prevention structure according to Embodiment 1 of the present invention is applied. FIG. 2 is an exploded perspective view in which the configuration of the front surface of the electronic apparatus of FIG. 1 is disassembled. FIG. 3 is an exploded perspective view of the configuration of the sub-panel viewed from the front side. FIG. 4 is an exploded perspective view of the configuration of the sub-panel viewed from the back side. FIG. 5 is a perspective view of the configuration of the sub-panel viewed from the back side. Hereinafter, a case where the light leakage prevention structure according to the present invention is applied to an in-vehicle electronic device 1 such as a car audio device will be described.

As shown in FIG. 1, the electronic device 1 includes a device main body 2, a sub panel 3, and a front panel 4. As shown in FIG. 2, a disk insertion slot 5 is formed on the front surface of the device body 2, and an SD card read / write device 6 is arranged with the SD slot facing the front surface. Further, the apparatus main body 2 has a built-in reproduction mechanism for reproducing recorded data of a recording medium such as a CD, DVD, or BD (Blu-ray disc) inserted through the disk insertion slot 5. The sub panel 3 is attached to the front surface of the device body 1 and functions as an operation panel of the electronic device 1.

The sub-panel 3 is provided with a disk opening 7, an SD card opening 8, and a front panel opening / closing mechanism 9. When the sub panel 3 is assembled to the front surface of the device main body 2, the disk opening 7 faces the disk insertion slot 5, and the SD card opening 8 faces the SD slot. As a result, the SD card is inserted into the SD slot through the SD card opening 8, and the BD or the like is conveyed to the playback mechanism inside the device main body 2 through the disk opening 7 and the disk insertion slot 5. . The front panel opening / closing mechanism 9 is engaged with the back side of the front panel 4 via the opening / closing mechanism opening 3d to open / close the front panel 4. Here, the state in which the front panel 4 covers the sub-panel 3 is a closed state, and the state in which the front panel 4 is rotated about the hinge axis and the sub-panel 3 is exposed is an open state.

Further, as shown in FIGS. 3 and 4, the push button 10, the prism 11, the substrate 12, and the light source 14a are assembled to the sub-panel 3. The push button 10 is exposed to the front surface of the sub-panel 3 and is fitted into the button opening 3b, and the boss portion 10a pushes the switch 13 by pressing the button surface. In this way, the switch 13 is turned on / off in response to the pressing operation of the push button 10.

The prism 11 is a prism that guides light generated by the light source 14a to the SD side illumination unit 11a and guides light generated by the light source 14b to the design surface of the push button 10 and the disk side illumination unit 11b. 10 is assembled to the sub-panel 3 from the back side.
Note that the design surface of the push button 10 is a watermark surface through which light passes, and is illuminated by the light generated by the light source 14b to be the design illumination of the sub-panel 3. The SD-side illumination unit 11a is exposed to the front surface of the sub-panel 3 via the SD-side illumination opening 3a, and is illuminated with the light generated by the light source 14a to become the design illumination of the sub-panel 3. Further, the disk side illumination unit 11b is exposed to the front surface of the sub panel 3 through the disk side illumination opening 3c, and is illuminated with the light generated by the light source 14b to become the design illumination of the sub panel 3. For the

light sources

14a and 14b, for example, LEDs (Light Emitting Diodes) are used.

The substrate 12 is a substrate on which the switch 13 and the

light sources

14a and 14b are mounted. Here, it is assumed that the substrate is made of a material having optical transparency such as a glass epoxy substrate. Further, when the substrate 12 is assembled from the back side of the sub-panel 3, the light source 14 a is located directly below the SD side illumination part 11 a of the prism 11, the switch 13 is located directly below the boss part 10 a of the push button 10, and the prism 11 The light source 14b is located directly below the disk side illumination unit 11b.
As shown in FIG. 5, when viewed from the back side of the sub-panel 3, the right end surface of the substrate portion 12a on which the light source 14a is mounted is close to the opening / closing mechanism opening 3d, and the left end surface of the substrate portion 12a. Is close to the opening 8 for the SD card.

Here, a conventional light leakage prevention structure will be described.
FIG. 6 is an enlarged view of region B when FIG. 5 is a sub-panel to which a conventional light leakage prevention structure is applied. FIG. 7 is a cross-sectional view taken along line AA when FIG. 5 is a sub-panel to which a conventional light leakage prevention structure is applied. FIG. 8 is a diagram showing a configuration of a light source peripheral portion in a sub-panel to which a conventional light leakage prevention structure is applied. FIG. 8A is an enlarged view of a peripheral configuration of the light source 14a of FIG. ) Is a view seen from the direction C in FIG. FIG. 9 is a front view of the sub-panel.

The

ribs

15 a and 15 b shown in FIGS. 6 and 7 are integrally formed on the back surface of the sub-panel 3, and serve as a seating surface when the substrate 12 is assembled to the back surface of the sub-panel 3. The substrate 12 is positioned and affixed with screws in contact with the

ribs

15a and 15b.
In the conventional light leakage prevention structure, the light from the light source 14a is prevented from directly reaching the opening / closing mechanism opening 3d and the SD card opening 8 by surrounding the light source 14a with the

ribs

15a and 15b.
However, when the substrate 12 is light transmissive, a light leakage path is formed in which light from the light source 14a passes through a region where no wiring pattern is applied and exits from the end surface of the substrate portion 12a. For example, as shown in FIG. 8B, there is a region D3 where the wiring pattern is not applied between the wiring pattern region D1 including the light source 14a and the region D2 where the

ribs

15a and 15b are in contact with the substrate portion 12a. In this case, as shown in FIG. 8A, light from the light source 14a passes through the region D3 and is emitted from the end face of the substrate portion 12a.
At this time, the end surface itself of the board portion 12a emits light, and the light from the end surface is reflected by the side surface of the front panel opening / closing mechanism 9 and the side surface of the SD card reading / writing device 6, and as shown in FIG. Light leaks from the portion E1 of the mechanism opening 3d on the substrate portion 12a side, and light leaks from the portion E2 of the SD card opening 8 on the substrate portion 12a side.

Next, the light leakage prevention structure of the present invention will be described.
FIG. 10 is an enlarged view of region B when FIG. 5 is a sub-panel to which the light leakage prevention structure according to Embodiment 1 is applied. FIG. 11 is a cross-sectional view taken along line AA when FIG. 5 is a sub-panel to which the light leakage prevention structure according to Embodiment 1 is applied. FIG. 12 is a diagram illustrating a configuration of a light source peripheral portion in a sub-panel to which the light leakage prevention structure according to Embodiment 1 is applied.

In the light leakage prevention structure according to the first embodiment, the

ribs

15a and 15b integrally formed on the back surface of the sub-panel 3 are arranged around the light source 14a from the end surface of the substrate portion 12a as shown in FIGS. The

ribs

15A and 15B are formed so as to surround. With this configuration, light from the light source 14a and light emitted from the light source 14a through the substrate 12a and emitted from the end face are shielded by the

ribs

15A and 15B, and the opening / closing mechanism opening 3d and SD Light leakage from the card opening 8 can be prevented.

As shown in FIGS. 11 and 12, even when the

ribs

15A and 15B are provided, the light from the light source 14a passes through the area of the substrate portion 12a where the wiring pattern is not applied and travels toward the rear of the substrate 12. However, there is almost no influence of light leakage by this transmitted light.
That is, since the front and back surfaces of the substrate 12 are generally subjected to a colored resist process, most of the light leaking from the opening / closing mechanism opening 3d and the SD card opening 8 is exposed to a light-transmitting material. This is caused by light from the end face of the substrate portion 12a.
Further, on the rear side of the substrate 12, constituent members are arranged at positions away from the distance between the end surface of the substrate portion 12 a, the side surface of the front panel opening / closing mechanism 9, and the side surface of the SD card read / write device 6. Therefore, even if the reflected light from this component leaks from the opening / closing mechanism opening 3d and the SD card opening 8, the amount of light leaked is significantly smaller than when the end face of the substrate 12a is not shielded.

In the above description, the rib integrally formed on the back surface of the sub-panel 3 is extended so as to surround the periphery of the light source 14a from the end surface of the substrate portion 12a to form the

ribs

15A and 15B. The rib may be arranged so that the rib surrounds the periphery of the light source 14a from the end surface of the substrate portion 12a.

As described above, according to the first embodiment, the light source 14a is provided so as to surround the end surface of the substrate 12, and the light from the light source 14a and the light from the light source 14a are transmitted through the substrate 12. Since the

ribs

15A and 15B for shielding the light emitted from the end face are provided, light leakage due to the light emitted from the end face through the substrate 12 on which the light source 14a is mounted can be reliably prevented.

Further, according to the first embodiment, since the

ribs

15A and 15B are ribs formed integrally with the sub-panel 3 of the in-vehicle electronic device 1 provided with the SD side illumination unit 11a, the number of parts is increased. The above effects can be obtained.

In the present invention, any component of the embodiment can be modified or any component of the embodiment can be omitted within the scope of the invention.

Since the light leakage prevention structure according to the present invention can prevent light leakage due to light emitted from the end face through the substrate on which the light source is mounted, the vehicle-mounted electronic in which various design illuminations are used depending on the vehicle type Suitable for equipment.

1 electronic device, 2 device body, 3 sub-panel, 3a SD side illumination opening, 3b button opening, 3c disk side illumination opening, 3d opening / closing mechanism opening, 4 front panel, 5 disk insertion slot, 6 SD card read / write device, 7 disc opening, 8 SD card opening, 9 front panel opening / closing mechanism, 10 push button, 10a boss, 11 prism, 11a SD side illumination unit, 11b disc side illumination unit, 12 substrate , 12a substrate part, 13 switches, 14a, 14b light source, 15a, 15b, 15A, 15B ribs.

Claims

In a light leakage prevention structure of an electronic device including a substrate on which a light source is mounted and an illumination unit that is illuminated with light from the light source,
A light leakage prevention rib provided so as to surround the light source from an end surface of the substrate, and blocking light emitted from the light source and light emitted from the end surface through the substrate. A light leakage prevention structure comprising:
2. The light leakage prevention structure according to claim 1, wherein the light leakage prevention rib is a rib formed integrally with a panel of the electronic device in which the illumination unit is provided.