JP5142083B2 - Electronic device and LED display structure thereof - Google Patents

Description

  The present invention relates to an LED display structure of an electronic device such as a motor control device.

In an electronic device such as a motor control device, a plurality of LEDs (Light Emitting Diodes) are arranged in a straight line on a substrate and displayed on a display window provided on a panel outside the electronic device. Here, when there is a distance between the LED and the display window, it is general to use a light guide portion made of a light guide material for guiding light from each LED to the display window. Some LED light guides are connected together to facilitate handling as a light guide plate having continuous light guides. (For example, see Patent Document 1)
5 to 7 show examples of LED display structures of conventional electronic devices.
FIG. 5 is a completed view seen from the viewing side of the LED display portion of a conventional electronic device. In the figure, 2 is a panel made of resin, 3 is a display sheet affixed on the panel 2, and there are display windows 7a to 7d, from which LED light is displayed.
FIG. 6 is an exploded perspective view of a portion related to an LED display of a conventional electronic device. In the figure, 1 is a substrate having a plurality of LEDs, and the LEDs 6a to 6d are mounted on the back surface of the substrate. Reference numeral 40 denotes a light guide plate in which continuous columnar light guide portions 40a to 40d are integrally connected, and is made of a transparent resin. The light guide plate 40 is screwed or welded to the panel 2. The substrate 1 and the panel 2 are screwed with screws 5.
FIG. 7 is a cross-sectional view after assembling a portion related to an LED display of a conventional electronic device. Here, the cross section is XX in FIG. The light from the LEDs 6a to 6d is guided to the display windows 7a to 7d on the viewing side by the light guides 40a to 40d.
However, in the configuration of this conventional example, when the interval between the LEDs becomes narrow or the brightness of the LEDs is high, the light of the adjacent LEDs leaks to the display window through the adjacent light guide unit, and the LEDs of the same color In the case of, luminance unevenness occurs, and in the case of a different color LED, color unevenness occurs, which may cause misrecognition of display. In this case, the brightness of the LED is adjusted to prevent display misidentification.
In order to cope with this problem of light leakage, it has been proposed to shield between the light guide and the light guide. (For example, see Patent Documents 2 and 3)
JP-A-5-303340 No. 7-29653 JP 2004-233466 A

In the conventional examples shown in FIGS. 5 to 7, in addition to the above-described problems, light leakage may increase due to variations in light guide plate attachment. In addition, there is a problem that if the user forgets to attach the light guide plate, he / she will not be aware and the product will be defective. Moreover, when welding a light-guide plate, management of a welding process and confirmation of a welding state are required, and there also exists a problem which an assembly man-hour increases.
Further, in Patent Document 2, there is a problem that the light guide plate has a light shielding hole and is weak in strength.
In Patent Document 3, although there is a light shielding structure, there is a possibility that light is leaked due to a large gap between the light guide portion and the light shielding member. There is also a problem that the light shielding member is on a ladder, and the structure is complicated and difficult to assemble.
The present invention has been made in view of such problems, and reliably prevents light leakage of adjacent LEDs, eliminates the need to adjust the brightness of LEDs, and is simple in structure and strong in strength. An object of the present invention is to provide an LED display structure of an electronic device that has few man-hours, has no variation in light guide plate attachment, and immediately notices when the light guide plate is forgotten to be attached, and can prevent a shortage.

In order to solve the above problems, the present invention is configured as follows.
According to the first aspect of the present invention, a plurality of LEDs arranged in the vertical direction while projecting forward are formed on the front surface of the substrate extending in the vertical direction on the back side in the front- rear direction, and the substrate is disposed on the front side in the front-rear direction. A display sheet in which a plurality of display windows are arranged in a vertical direction at each of a plurality of locations that extend substantially in parallel in the vertical direction and have the same height as the positions of the plurality of LEDs, and the substrate and the display sheet are connected. A panel having a side plate extending in the front-rear direction and the LED and the display window each positioned at the same height are arranged in the vertical direction so as to be connected in the front-rear direction. A plurality of light guides for guiding light to each display window, and a connecting part for connecting the front and rear intermediate portions of the plurality of light guides in the vertical direction are sandwiched and fixed between the substrate and the panel. electronic device having a light guide plate that, the In the LED display structure, each of the plurality of light guide sections, in the fixed state has a rear portion disposed so as to face the front side of the LED, wherein the panels, the horizontal direction from the side plate The gaps between the plurality of light guides arranged in the up-down direction are respectively closed, and the dimension in the front-rear direction is from the rear end of the plurality of light guides to the light guide plate. A plurality of convex portions that block light emission, which is smaller than the distance to the connecting portion, are integrally formed .
The invention described in Claim 2 is the LED display structure for an electronic apparatus according to claim 1, wherein the light guide plate sandwiched the between the substrate and the panel is screwed together with the substrate and the panel and is characterized in Rukoto is an integral structure with.

According to the first and third aspects of the present invention, the protrusions that are integrally formed with the panel and that block light emission from the LEDs are provided in the gaps between the adjacent light guides. Light leakage is surely prevented, adjustment of the brightness of the LED is not required, and the strength is simple with a simple structure, and the number of assembly steps is small.
Furthermore, according to the invention described in claims 2 and 3, the light guide plate is sandwiched between the substrate and the panel and screwed together with the substrate and the panel to form an integrated structure. It is strong, has few assembly steps, has no variation in light guide plate attachment, and immediately notices when it is forgotten to attach the light guide plate, and it is possible to prevent shortage defects.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The completed drawing from the viewing side of the electronic apparatus having the LED display structure of the present invention is the same as the conventional figure shown in FIG.
FIG. 1 is an exploded perspective view of an electronic device having the LED display structure of the present invention as viewed from the LED viewing side. In the figure, reference numeral 1 denotes a substrate on which a plurality of LEDs 6a to 6d are linearly mounted. A light guide plate 4 is made of a transparent resin having a structure in which columnar light guide portions 4a to 4d for the LEDs 6a to 6d are integrally connected. 8 is a die cutting part of the panel 2, from which the light of the LEDs 6a to 6d passes. Reference numeral 5 denotes a screw for fixing the substrate 1 to the panel 2.
FIG. 2 is an exploded perspective view of an electronic apparatus having the LED display structure of the present invention viewed from an angle different from that in FIG. 1 (back side of the panel). Here, 2a is the shape of a convex portion provided on the panel, and this convex portion 2a is formed so as to close the gap between the columnar light guide portions 4a to 4d, and blocks the light emission from the adjacent LEDs 6a to 6d. Prevent leakage. The light guide plate 4 is sandwiched between the panel 2 and the substrate 1 and is screwed together with the substrate 1 and the panel 2 with two screws 5 to form an integral structure.
FIG. 3 is a view in which a light guide plate of an electronic apparatus having the LED display structure of the present invention is assembled to a resin panel. For the sake of explanation, the substrate 1 originally assembled on the light guide plate 4 is not shown.
FIG. 4 is a cross-sectional view after assembling an electronic apparatus having the LED display structure of the present invention. Here, the cross section is YY in FIG. The light from the LEDs 6a to 6d is guided to the display windows 7a to 7d by the light guide portions 4a to 4d of the light guide plate 4, but the convex portion 2a of the panel 2 closes the gap between the light guide portions 4a to 4d and emits light from the LEDs 6a to 6d. It blocks and reliably prevents light from leaking to the adjacent display windows 7a to 7d.
The present invention is different from the conventional one in that the projection 2a is provided on the panel 2, and the gap between the light guides 4a to 4d of the light guide plate 4 is closed by the projection 2a, and the light guides 4a to 4d are integrated. The light guide plate 4 connected to the substrate 1 is sandwiched between the substrate 1 and the panel 2 and is screwed together with the substrate 1 and the panel 2 to form an integrated structure.

  By adopting such a structure, the convex portion of the panel, the light guide portion, and the LED can be attached without gaps, so that light leakage from adjacent LEDs can be reliably prevented, and adjustment of the luminance of the LEDs can be made unnecessary. Moreover, since the convex part of the panel is used for light shielding, no separate parts for light shielding are required, the structure is simple and strong in strength, and the number of assembly steps is small. Moreover, as shown in FIG. 2 and FIG. 4, the light guide plate is integrally connected with the light guide portion of each LED, sandwiched between the substrate and the panel, and screwed together with the substrate and the panel to form an integrated structure. Simple structure and high strength, with few assembly steps. Further, since the light guide plate is fixed without play, there is no variation in mounting. In addition, when the light guide plate is forgotten to be attached, a step is formed between the substrate and the panel, and the user immediately notices that the light is forgotten to be attached. Therefore, it is possible to prevent a shortage defect.

The disassembled perspective view which looked at the electronic device with the LED display structure of this invention from the LED visual recognition side The disassembled perspective view of the electronic device with the LED display structure of this invention The figure which assembled | attached the light-guide plate of the electronic device with the LED display structure of this invention to the resin panel Sectional drawing after the assembly of the electronic device having the LED display structure of the present invention Completion drawing seen from the viewing side of the LED display part of a conventional electronic device The exploded perspective view of the part which concerns on LED display of the conventional electronic device Sectional drawing after the assembly of the part which concerns on LED display of the conventional electronic device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Board | substrate 2 Panel 2a Convex part 3 Display sheet 4 Light guide plate 4a-4d Light guide part 5 Screw 6a-6d LED
7a-7d Display window 8 Die cut part

Claims (3)

A plurality of LEDs arranged in the vertical direction while protruding forward on the front surface of the substrate extending in the vertical direction on the back side in the front-rear direction ,
A display sheet in which a plurality of display windows are arranged vertically in each of a plurality of locations that extend in the vertical direction substantially parallel to the substrate on the front side in the front-rear direction, and have the same height as the positions of the plurality of LEDs,
A panel including a side plate extending in the front-rear direction while connecting the substrate and the display sheet ;
A plurality of light guides arranged in the vertical direction so as to connect each pair of the LED and the display window located at the same height in the front-rear direction, and guides light from each LED to each display window; and A light guide plate that includes a connecting portion that connects the front and rear intermediate portions of the plurality of light guide portions in the vertical direction, and is sandwiched and fixed between the substrate and the panel ;
In the LED display structure of an electronic device having
Each of the plurality of light guides is
In the fixed state, it has a rear end portion arranged to face the front side of each LED,
The panel is
The gaps between the plurality of light guides that are provided to protrude from the side plate in the left-right direction and are arranged in the vertical direction are respectively closed, and the dimension in the front-rear direction is from the rear end of the plurality of light guides. An LED display structure for an electronic device, comprising: a plurality of convex portions that block light emission that are smaller than a distance to the connecting portion of the light guide plate . The light guide plate sandwiched the between the substrate and the panel, LED display structure of an electronic device according to claim 1, wherein Rukoto is an integral structure screwed together with the substrate and the panel. An electronic apparatus having the LED display structure according to claim 1.

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