JP5054631B2 - Light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting device that optimally prevents optical guiding of a circuit board on which many light-emitting elements are mounted. <P>SOLUTION: A light-emitting device 1 includes many light-emitting elements 2 and a circuit board 3 on which the light-emitting elements 2 are mounted. The circuit board 3 includes a feed-through groove 7 between a light-emitting element 2a and a light-emitting element 2b that are mounted, and a light-shielding wall 8 is inserted into the feed-through groove 7. Combined use of the feed-through groove 7 and the light-shielding wall 8 effectively shuts off adverse optical guiding between the irradiation region of an LED2a and that of an LED2b. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a light emitting device. More specifically, it is equipped with a plurality of light emitting elements and a circuit board on which the light emitting elements are mounted, and each light emitting element independently illuminates the display on the corresponding display unit, and is mounted on a vehicle device. The present invention relates to a possible light emitting device.

  2. Description of the Related Art In-vehicle devices such as a vehicle overhead console and car navigation are often equipped with a light emitting device including a plurality of light emitting elements and a substrate on which the light emitting elements are mounted. These light emitting devices function as an indicator lamp and a backlight, and can display the operating state of the device in an easy-to-understand manner.

Patent Document 1 discloses a two-mode display pushbutton switch device in which an operation state of a device is switched by pressing and releasing a pushbutton switch, and a display unit for displaying the operation state is provided below the pushbutton switch. Yes. The switch device of Patent Document 1 includes two display units provided on the front surface of the push button and two light emitting units provided so as to correspond to the display units. Each time the operating state is switched by the push button, one of the light emitting units illuminates only one of the display units, thereby displaying the operating state.
Published Utility Model No. 60-112026

In the two-mode display pushbutton switch device of Patent Document 1, when two small display units are close to each other, the light emitting element may illuminate the adjacent display unit, and the adjacent display unit may appear to be quasi-lit. there were. As one means for solving such a problem, an attempt has been made to shield light by providing various partition walls between the light emitting elements and extending to the display portion. Patent Document 2 discloses a technique in which a partition plate is disposed around a light emitting element to shield light from the light emitting device and improve the visibility of the display unit.
JP 2003-54315 A

  However, in recent years, it has been known that even if a partition wall is provided between adjacent light emitting elements, light from the light emitting element reaches an unintended adjacent region. As a result of various studies, the circuit board on which the light emitting element is mounted guides light, so that the light of the light emitting element reaches the area of the adjacent light emitting element across the partition wall, and the adjacent light emitting element should irradiate from there. The phenomenon that illuminates the display part of was confirmed. For this reason, a technique for preventing the light guide of the circuit board is required in order to reliably prevent light from the light emitting element from reaching an unintended region.

  In a display device having a plurality of light emitting elements, light from the light emitting elements reaches an area that should be blocked by the partition wall. There was a problem of misunderstanding as if. In order to prevent this problem, a technique for preventing light guide of a circuit board on which a light emitting element is mounted has been strongly demanded. The present invention has been made to solve this problem, and has an object to provide a light-emitting device in which light guiding through a circuit board on which a plurality of light-emitting elements are mounted is suitably prevented. Yes.

The present invention relates to a light emitting device. The light emitting device of the present invention includes a plurality of light emitting elements and a circuit board on which the light emitting elements are mounted. In this circuit board, a through groove is provided between the light emitting elements mounted adjacent to each other, and a light shielding wall is inserted into the through groove . In addition, the light-emitting device of the present invention further includes a holder that has a partition wall that individually surrounds the light-emitting elements, and that is disposed so as to contact the circuit board. The light shielding wall inserted into the through groove of the circuit board is formed integrally with the holder. The partition part of the holder prevents light from the light emitting element from leaking outside the partition part. By integrally forming the light shielding wall on the holder, it is possible to simultaneously prevent the circuit board from being guided without increasing the number of components.

  The inventor has found that the light guide by the circuit board can be surely prevented by providing a through-groove in the circuit board and further inserting a light-shielding wall there, and has reached the present invention.

In the light emitting device of the present invention, a square frame-shaped light shielding region is formed by applying a light shielding paint to a rectangular frame region that individually surrounds the light emitting elements on the upper surface of the circuit board. Separated from each other by The light emitting device of the present invention is configured such that the partition wall comes into contact with the light shielding region when the holder is disposed on the upper surface of the circuit board.

  The light-emitting device of the present invention further includes a switch, a switch knob that inputs a signal for switching the switch, and one or more display units that transmit light of the light-emitting element and display the light emission state to the outside. Can do. In addition, at least one of the light emitting elements that displays a light emitting state on the outside by the display unit is turned on and off in conjunction with a switch switching operation. With the light emitting device of the present invention, the operating state of the switch is easily recognized from the outside by the light emission of the light emitting element and the display unit for displaying it.

  The light-emitting device of the present invention is particularly preferably mounted on a vehicle device.

  In the light emitting device of the present invention, the through groove is provided in the circuit board, and the light shielding wall is inserted into the through groove, so that the light guide of the circuit board can be reliably prevented. By preventing the light guide of the circuit board, light does not reach the unintended adjacent area by the light guide, and the pseudo lighting problem that may occur in the adjacent area is avoided in advance Is provided.

  In the light emitting device of the present invention, a light shielding wall can be integrally formed on a holder having a partition wall surrounding at least one of the light emitting elements. This provides a light emitting device that prevents light from leaking out of the partition wall without causing an increase in the number of components, and at the same time, prevents light from being guided from the circuit board at the same time.

  The light-emitting device of the present invention includes a switch, a switch knob for switching the switch, and one or more display units that transmit light of the light-emitting element and display the light-emitting state to the outside. At least one of the light emitting elements for displaying can be turned on and off in conjunction with the switching operation of the switch. Thereby, the light-emitting device which can visually recognize the operation state of a switch easily is provided.

  The light-emitting device of the present invention has a plurality of light-emitting elements arranged in close proximity efficiently in a limited space, and the visibility is improved even when each is controlled to turn on and off under different conditions. Since it is very high, it can be suitably mounted on a vehicle device.

  An embodiment in which the light emitting device 1 of the present invention is mounted on an interior light switch of an overhead console of a vehicle will be described with reference to FIGS. In FIG. 1, the front view of the interior lamp switch 20 which the light-emitting device 1 of this embodiment becomes a component is shown. FIG. 2 is a sectional view of the interior light switch 20 shown in FIG. 1 cut along the line II-II. The interior light switch 20 is turned on when an ON switch 12 is set to always turn on the interior light, an OFF switch 13 is set to always turn off, and any one of the doors is opened. Three switches of the door switch 14 to be set are provided.

  As shown in FIG. 2, the light emitting device 1 of the present embodiment constitutes a door switch 14 in the interior light switch 20. The light-emitting device 1 includes a circuit board 3, two LEDs 2 a and 2 b (hereinafter also referred to as LEDs 2) that are light-emitting elements mounted on the circuit board 3, a holder 5, A switch knob 6, a display unit 4 provided on the switch knob 6, and a light guide plate 9 are provided. The display unit 4 operates as an indicator interlocked with the door switch 14 by the configuration of the light emitting device 1 described in detail below. Further, the switch knob 6 is lit in conjunction with the small lamp of the vehicle, so that the location of the door switch 14 can be displayed in an easy-to-understand manner.

  On the circuit board 3, in addition to the two LEDs 2a and 2b, a switch terminal 15 (see FIG. 3) that generates a signal when the door switch 14 is selected by being pressed, and terminals corresponding to other switches, Various drive circuits are implemented. In the following, the surface of the circuit board 3 on which the LED 2 is mounted is referred to as the upper surface, and the opposite surface is referred to as the lower surface. Further, a direction away from the circuit board 3 from the upper surface of the circuit board 3 as a starting point is referred to as an upward direction of the circuit board 3, and a direction away from the circuit board 3 as a starting point from the lower surface of the circuit board 3 is defined as the lower side of the circuit board 3. It is called a direction.

  The holder 5 is made by molding a synthetic resin that does not transmit the light of the LED 2. The holder 5 is in contact with the upper surface of the circuit board 3 in order to prevent the light from the LED 2 from spreading in an unintended direction and to support the display unit 4 and the switch knob 6 at a predetermined distance from the board. Are arranged as follows. The holder 5 of the present embodiment includes two partition walls 10a and 10b (hereinafter sometimes referred to as partition walls 10) having a closed quadrangular cross-sectional shape (see FIG. 3). ). The partition wall 10a and the partition wall 10b share one side (the wall 8 shown in FIG. 3). One side shared by the partition wall 10a and the partition wall 10b is formed to be longer than the side facing this. At the same time, one side shared by the partition wall portion 10 a and the partition wall portion 10 b extends longer toward the lower surface side of the circuit board 3 than the other three sides, and that portion constitutes the light shielding wall 8.

  A through groove 7 is provided between the LED 2 a and the LED 2 b on the circuit board 3. The width of the through groove 7 is shorter than the distance between the LED 2a and the LED 2b, but the length of the through groove 7 is longer than the distance between the LED 2a and the LED 2b. The through groove 7 has a cross-sectional shape that can accommodate the light shielding wall 8 of the holder 5.

  As shown in FIG. 3, a light-shielding paint is applied to the upper surface of the circuit board 3 in a rectangular frame region that separately surrounds the LED 2 a and the LED 2 b. The square frame-shaped light shielding region surrounding the LED 2 a and the square frame-shaped light shielding region surrounding the LED 2 b are separated from each other by a through groove 7. The light shielding paint prevents the light from each LED 2 from being reflected at this portion. When the holder 5 is disposed on the upper surface of the circuit board 3, the partition wall portion 10a is in contact with the region where the light shielding paint surrounding the LED 2a is applied, and the partition wall portion 10b is disposed in contact with the position surrounding the LED 2b. . At this time, the light shielding wall 8 of the holder 5 is inserted into the through hole 7.

  The switch knob 6 is held by the holder 5 and the panel 11. The switch knob 6 is movable in the vertical direction (direction approaching and separating) with respect to the circuit board 3 and is held at different positions by contacting the holder 5 and the panel 11 when pressed and released. By pressing and releasing the switch knob 6, the switch terminal 15 mounted on the circuit board 3 is switched.

  The upper surface of the switch knob 6 has a substantially rectangular shape, and “DOOR” is displayed as a simple description showing the contents that can be set by switching the switch. The upper surface of the switch knob 6 is formed of a hard resin that can partially transmit light. The switch knob 6 is provided with an opening at a position facing the LED 2a on the circuit board 3, and the display unit 4 is provided here. The display portion 4 has a columnar shape in which one end portion is positioned close to the LED 2 a, the other end portion is fitted in the opening of the switch knob 6, and the side portion is surrounded by the partition wall portion 10 a of the holder 5. The light guide plate 9 is fitted. The display unit 4 displays the light emission state of the LED 2 a guided by the light guide plate 9 to the outside.

  The LED 2 a is controlled by the circuit board 3 to be turned on and off in conjunction with the setting of the switch terminal 15, and has a function as an indicator of the door switch 14. The LED 2a is turned on at the same time that the switch knob 15 of the door switch 14 is pressed and the switch terminal 15 is switched, and the setting is changed so that the interior light is turned on when any door is opened. Light emission continues while 14 is selected. Further, when the ON switch 12 or the OFF switch 13 is selected and the switch knob 6 is opened, the setting of the switch terminal 15 is switched to turn off the light.

  When the LED 2a is turned on, the light emitted from the LED 2a to the circuit board 3 from the upper side to the horizontal direction in FIG. 2 is shielded by the partition wall 10a of the holder 5 and does not leak outside the partition wall 10a. Further, a part of the light emitted downward is guided by the circuit board 3, but is shielded by the through groove 7 and the shielding plate 8 inserted therein, so that the light is emitted from the through groove 7. It does not leak to the outside (right side in FIG. 2), and does not enter the area where the LED 2b is mounted at a position crossing the through groove 7 and the switch knob 6 above it. On the other hand, all the light emitted from the upper side to the horizontal direction with respect to the circuit board 3 and not shielded by the partition wall portion 10a irradiates the light guide plate 9, and is guided to the display portion 4 by the light guide plate 9, and the LED 2a. Displays the lighting status of. From this light, it is recognized from the outside that the display unit 4 is lit. As described above, the light of the LED 2a is surely prevented from pseudo-lighting the adjacent switch knob 6 beyond the partition wall 10a and the shielding plate 8. At the same time, the light emitted from the LED 2a is transmitted to the outside through the light guide plate 9 and the display unit 4 with high visibility.

  The LED 2b is controlled by the circuit board 3 so as to be lit in conjunction with the small lamp of the vehicle being lit. The light emitted from the LED 2b illuminates the upper surface of the switch knob 6 so that the location of the switch can be easily recognized during night operation, and has a function as a marking lamp of the switch.

  When the LED 2b is turned on, the light emitted from the LED 2b to the circuit board 3 in the lateral direction from above in FIG. 2 is shielded by the partition wall 10b of the holder 5 and therefore does not leak outside the partition wall 10b. In addition, a part of the light emitted downward is guided by the circuit board 3, but is shielded by the through groove 7 and the shielding plate 8 inserted therein, so that it is outside from the through groove 7 ( It does not leak into the left side in FIG. 2 and does not enter the area where the LED 2a is mounted at a position crossing the through groove 7. The light emitted from the upper side to the horizontal direction with respect to the circuit board 3 and not shielded by the partition wall portion 10 a irradiates the upper surface of the switch knob 6. However, at this time, the light traveling straight from the LED 2b is sufficiently shielded by the partition 10b, and the display unit 4 is not illuminated by the light emitted from the LED 2b. As described above, the light of the LED 2b does not illuminate the adjacent region beyond the partition wall 10b and the through groove 7 and the shielding plate 8, and therefore, there is no possibility of causing the display unit 4 to be quasi-lit.

  In the circuit board 3 of the light emitting device 1 of the present embodiment, a through groove 7 is provided between the mounted LED 2a and LED 2b. A light shielding wall 8 provided below the partition wall 10 of the holder 5 is inserted into the through groove 7, and the light of the LED 2 is reliably shielded from irradiation in an unintended direction, and from the circuit board 3. Light guiding is also prevented. As a result, the light emitted from the LED 2a reaches the light emitting unit 4 accurately and is recognized as the lighting of the light emitting unit 4 from the outside, but there is no fear of irradiating the upper surface of the switch knob 6 to make a pseudo lighting. Further, the light emitted from the LED 2b accurately reaches the upper surface of the switch knob 6 and irradiates the switch knob 6, while there is no possibility of irradiating the display unit 4 and causing it to be quasi-lit. In this way, the light emission of the LED 2 is exactly turned off so that only one of the intended areas is irradiated, even if one of the lights is turned on to emit light and the other is turned off. The risk of pseudo lighting of the area corresponding to is prevented.

  The light emitting device 1 of the present embodiment irradiates different objects accurately and with high visibility even when two LEDs 2 are arranged close to each other and are controlled to turn on and off under different conditions. can do. Such a light-emitting device 1 is particularly suitable for vehicle equipment because even if more indicators and partial lighting are arranged in a narrow space and each of them is lit under different conditions, pseudo-lighting of adjacent areas does not occur. Can be installed.

  As mentioned above, although this invention was demonstrated in detail by embodiment, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. For example, the lighting and extinguishing of the LEDs in this embodiment are controlled by a switch only for one LED, but the lighting conditions of the light emitting elements can be set independently and arbitrarily. Further, the configuration in which one display unit is provided in the switch knob has been described, but the arrangement and number of display units can be arbitrarily changed. Furthermore, although the embodiment has exemplified the form in which the through groove is provided in a straight line, the through groove may be formed in a curve or a polygon depending on the size of the region where light guide of the circuit board is desired to be prevented and the arrangement of the light emitting elements. Is also possible. In addition, the materials and shapes of the holder and the switch knob can be arbitrarily changed within a range not impairing the functions described in the claims.

It is a front view of the interior lamp switch 20 in which the light emitting device 1 is a component. It is sectional drawing which cut | disconnected the interior light switch 20 by the II-II line. It is a fragmentary perspective view of the circuit board 3 and the holder 5 before attachment.

Explanation of symbols

1 Light-emitting device 2 LED
DESCRIPTION OF SYMBOLS 3 Circuit board 4 Display part 5 Holder 6 Switch knob 7 Through groove 8 Light shielding plate 9 Light guide plate 10 Bulkhead part 11 Panel 12 ON switch 13 OFF switch 14 Door switch 15 Switch terminal 20 Interior light switch

Claims (3)

A plurality of light emitting elements;
A circuit board on which the plurality of light emitting elements are mounted,
It said circuit board is a through groove is provided, the light-shielding wall penetration groove that is inserted emitting device between the mounted light emitting element and the light emitting element so as to be adjacent,
A holder arranged to contact the circuit board;
The holder has a partition wall formed so as to separately surround the plurality of light emitting elements,
The light shielding wall is formed integrally with the holder;
A square frame-shaped light shielding region is formed by applying a light shielding paint to a square frame-shaped region that individually surrounds the light emitting elements on the upper surface of the circuit board, and the light-shielding regions are separated from each other by the through grooves. And
The light emitting device according to claim 1 , wherein when the holder is disposed on an upper surface of the circuit board, the partition wall abuts on the light shielding region . A switch,
A switch knob for inputting a signal for switching the switch;
1 or 2 or more display parts which permeate | transmit the light of the said light emitting element, and display the light emission state to the exterior,
Wherein at least one among the light-emitting element for displaying the emission state to the outside by the display unit, the light emitting device according to claim 1, characterized in that turning on and off in conjunction with the switching operation of the switch. The light emitting device according to claim 1 , wherein the light emitting device is mounted on a vehicle device.

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