JPH07302931A - Collective lamp - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a collective lamp with improved visibility over a wider area and with less restrictions on use. [Structure] FIG. 1 is a schematic structural diagram of a collective lamp 100.
In FIG. 1 (a), the LED boards 2 and 3 are arranged vertically, and the LED board 2 is attached so as to be inclined downward when viewed from the front of the collective lamp. The LED light distribution characteristics of multiple substrates improve the brightness in the direction of the substrate, especially in the direction of the front and the inclined substrate, present the same information simultaneously in the direction of each light emitting surface, and spread visibility Will have.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to three different colors, especially RGB.
The present invention relates to a collective lamp including at least one or more three-color LEDs, and more particularly to a collective lamp used for a display module or the like used outdoors.

[0002]

2. Description of the Related Art Conventionally, it is difficult to form an LED that emits RGB light from a single LED lamp. Therefore, LEDs of each color are collectively arranged and configured as one lamp. Note)) is configured. Since a full-color display can be achieved by collecting RGB colors, a brighter blue LED is required to improve the color mixture in this collective lamp, and recently, the manufacture of high-brightness gallium nitride (GaN) blue LEDs has also become possible. It has been reported that it is possible to use a blue light emitting diode (LED) made of gallium nitride (GaN) semiconductor.

Since the collective lamp is formed by arranging a plurality of small LEDs, it is a relatively large structural unit and is often used for a large display panel or the like, and is often used outdoors. In that case, the display of the collective lamp used for the display panel may be difficult to see due to the brightness of sunlight during the day when it is normally used. This is the same as a phenomenon in which a traffic signal is difficult to see when illuminated by sunlight, and is a factor that impedes the purpose of display. Therefore, a hood that blocks external light is provided above the lamp like a traffic signal. This hood is often a part of the case of a collective lamp, and has a structure in which the light emitting part is exposed in order to efficiently use the light emission of the LED. For this reason, the board on which the LED is placed cannot be housed inside the case, so the board is fitted and the LED lead side is embedded with waterproof resin. In addition, the current used by the LED may be set near the upper limit in order to make it brighter.

[0004]

As the display device, it is desirable that the display device is visually recognized from the entire visible range. However, since the collective lamp is a lamp that uses LEDs, the brightness of the front of the lamp is high, but the brightness in the direction away from the front is low, as the light distribution characteristics. That is, the visibility other than the front is reduced. Expanding the light distribution characteristics of the LED in order to widen the visible range requires manufacturing a special LED, which increases the manufacturing cost and is not a good idea. Therefore, there is a problem in that it is difficult to change the light distribution characteristic due to the characteristics of the LED, and in principle, there is a relationship in which it is not possible to achieve both improved visibility other than in front and improved brightness.

[0005] Therefore, an object of the present invention is to provide a collective lamp which has a wider range of visibility and is less restricted in use.

[0006]

In order to solve the above-mentioned problems, the structure of the present invention is a collective lamp having RGB three primary colors and at least one LED of each color is arranged to form one display unit. The LED has a plurality of light emitting surfaces, and the light emitting directions of the light emitting surfaces are different. Further, the configuration of the related invention is characterized in that the plurality of light emitting surfaces are turned on with a time difference. The present invention is also characterized in that the plurality of LED substrates for the light emitting surface are both fixed by a lamp hood and potted with resin.

[0007]

The light distribution characteristic of the LED by a plurality of substrates improves the luminance in the direction of the substrates, particularly in the direction of the front and the inclined substrate, and simultaneously presents the same information in the directions of the respective light emitting surfaces.

[0008]

The visibility from a plurality of directions is improved, and the same information can be recognized from a distant position and a close position, or both left and right sides. In addition, even when the person viewing the display is moving, the information can be transmitted for a relatively long period of time.

[0009]

EXAMPLES The present invention will be described below based on specific examples. FIG. 1 is a schematic configuration diagram of the collective lamp 100. In Fig. 1 (a), the LED boards 2 and 3 are arranged vertically,
FIG. 1 is a cross-sectional view of a structure in which an LED board 2 is attached so as to be tilted downward when viewed from the front of the collective lamp (FIG. 1 (b)). (Hereinafter, referred to as a hood) is provided, and the LED boards 2 and 3 are fixed by fitting the hood 4 into the case body 1. A partition wall 8 is provided at the center of the inside of the case body 4, and the LED boards 2 and 3 are supported and fixed by the step on the inner circumference of the case body and the hood 4. In this state, the resin 5 is potted and waterproofing is taken. The inside of the case behind the sealed LED boards 2 and 3 is connected to a lead wire (not shown) introduced from a hole 10 in the back of the case body 1, and each LED is controlled to light up for display.

The LED boards 2 and 3 are fitted almost exactly to the stepped portion provided on the case body 1, and the stepped portion of the case for the upper LED board 2 is uneven when viewed from the front of the case body. Board 2 when LED board 2 is fitted
Is tilted downwards. The LED board 3 is arranged so as to face the front of the case body 1 as in the conventional case. The two boards 2 and 3 fitted in the step are pressed down by the beam structure 9 in the inner periphery and the central part of the hood 4, and the two LED boards 2 and
3 is fixed at the same time. After fixing the substrates 2 and 3 with the hood 4, the lower part of the LED is potted with resin 5 for waterproofing. The potting shown in Fig. 1 (a) is performed with the front of the collective lamp horizontal. Resin 5 is substrate 3
To form a resin surface 6 parallel to. Of course, as shown in FIG. 1D, the resin surface 7 on the substrate 2 side may be parallel to the substrate 2.

In most cases, the display device using the collective lamp 10 is arranged at a relatively high position so that it can be seen well. Therefore, the individual collective lamps 10 are mounted substantially horizontally and are tilted slightly downward from the horizontal. In this case, since the LED board 3 is mounted vertically, it is well visible from the far side, and conversely. Since the LED board 2 faces downward, it can be easily seen from the close position.
The degree to which the LED board 2 is tilted may be changed depending on the intended use, and is approximately 5 ° to 1 degree from the direction of the LED board 3.
The direction is downward by about 5 °.

Further, each of the LED boards 2 and 3 has 3 ×
6 LEDs are arranged, 8 for blue (B) and green for each
There are 6 (G) and 4 red (R). Further, the upper and lower LED substrates 2 and 3 have the same color arrangement pattern so that the same color mixture state is produced. The respective substrates 2 and 3 are lit with a circuit configuration as shown in FIG. In such a configuration, the common C
1. C1 and C2 are provided so that lighting control can be performed for each substrate.

With such a configuration, it is possible to light each substrate with a time lag, and for example, when the display device is lighted only when the cognitive person approaches a certain distance. Substrate 3 for long distance according to the distance of
The short-distance substrate 2 and the short-distance substrate 2 may be independently turned on, which has an advantage of saving power.

Since the display device using the collective lamp having such a structure has visibility in a plurality of directions, when mounting the collective lamp on the display device, the mounting directions of the individual collective lamps are considered one by one. There is no need, and manufacturing work becomes more efficient.

(Second Embodiment) As the structure of the collective lamp,
Instead of using two LED substrates, one flexible substrate 22 may be used and the light emitting surface may be tilted. That is, as shown in the schematic cross-sectional view of the collective lamp 20 shown in FIG. 2, the flexible board 22 is bent around the board central portion along the step provided on the case body 21, and the hood 24 is fitted therein. Thus, the state in which the light emitting surfaces are plural is maintained. As shown in FIG. 2 (a), the resin potting in this case makes the inclined flexible substrate 22 surface and the resin surface 26 parallel to each other. Solder so that the lead on the neck is longer. The resin surface may be parallel to the horizontal side, as shown in Fig. 2 (b).
The length of the lead portion of the ED may be the same, and the resin surface 27 may be inclined so as to be in the middle of the inclination of the two substrate surfaces.

In the structure using the flexible substrate 22, it is not necessary to provide the beam structure 9 and the partition wall 8 of the case body 4 as shown in FIG. 1 in the central portion of the hood 24, and the miniaturization of the collective lamp can be maintained. Other not shown,
Instead of bending at the central portion, a more flexible substrate may be arranged in a curved shape. The curved surface may be concave or convex.

(Third Embodiment) The collective lamp 40 shown in FIG.
Is for the purpose of expanding the viewing direction horizontally,
The collective lamp 40 is a case where the LED board 42 for the front surface and the LED boards 43, 44 for the left and right surfaces are formed. Each substrate is also fixed to the case body 41 by the hood 45 and potted with resin. 27 LEDs of three RGB colors are arranged on each board, and each board has the same color arrangement pattern. Each of the substrates 42, 43, and 44 is electrically controlled by a lead wire (not shown) from behind the case body through a hole (not shown). Although not shown, if the circuit for each board is configured so that each board is turned on independently, it is possible to control the display by shifting in time, for example, according to the timing when the vehicle passes. Can be displayed.

The term "light emitting surface" as used in the claims means that the LED substrate has LED
Are usually arranged in a matrix,
This is the surface formed by the LED matrix, and the light distribution characteristics are strongest in the direction perpendicular to this light emitting surface. As a configuration in which the light emitting directions of the light emitting surfaces are different from each other in the claims, there may be a plurality of substrates on the same light emitting surface.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a collective lamp of a first embodiment.

FIG. 2 is an explanatory diagram showing a configuration of a collective type lamp according to a second embodiment.

FIG. 3 is a circuit diagram of the LED substrates of the first and second embodiments.

FIG. 4 is an explanatory diagram showing a configuration of a collective type lamp according to a third embodiment.

[Explanation of symbols]

 100 collective lamp 1 case body 2 LED board 3 LED board 4 lamp hood 5 resin (potting) 6 resin surface 7 resin surface 8 partition wall 9 beam structure 10 holes (for lead wire) 20 collective lamp 21 case body 22 flexible board 24 lamp Hood 25 Resin (potting) 26 Resin surface 27 Resin surface 40 Collective lamp 41 Case body 42 LED board 43 LED board 44 LED board 45 Lamp hood

Claims (3)

[Claims] 1. A collective type lamp having RGB three primary colors and at least one LED for each color being arranged as one display unit, wherein the LEDs have a plurality of light emitting surfaces, and the light distribution direction of the light emitting surfaces. A collective lamp having different configurations. 2. The collective lamp according to claim 1, wherein the plurality of light emitting surfaces are lit with a time lag. 3. The collective lamp according to claim 1, wherein a plurality of LED substrates having the light emitting surface are fixed on a lamp hood and potted with resin.