JPH08116097A - Led display - Google Patents

Abstract

PURPOSE: To ensure, to some extent, visibility from a short distance without deteriorating visibility from a long distance, by dividing a condenser lens into a base adjacent to a substrate and a lens main part occupying the residual part, and making the direction angle of the base part larger than that of the lens main part. CONSTITUTION: The center of the lens main part 3a of a condenser lens 3 is positioned to exactly face an LED 2. A base part 3b of the condenser lens 3 is adjacent to a substrate 1. The direction angle of the lens main part 3a is set smaller than that of the base part 3b. The lens main part 3a and the base part 3b may be constituted by using convex lenses different in degree. In another case, the lens main part 3a is constituted by using a convex lens, and the base part 3b is constituted by using a concave lens. Out of the light emitted from the LED 2, the light introduced to the lens main part 3a is converged in a range of small direction angle wherein an optical axis is set as the reference, because the directivity is small. Thereby visibility from a long distance can be kept high. The light introduced to the base part 3b is emitted in a range of large direction angle of this part, so that visibility from a short distance can be attained to some extent.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION The present invention relates to an LED (Light).
The present invention relates to an Emitting Diode (light emitting diode) display, and more particularly to an LED display in which a light collecting diode mounted on a substrate is surrounded by a condenser lens.

2. Description of the Related Art Conventionally, as an LED display mainly intended for outdoor use, a front surface of a light emitting diode mounted on a substrate is surrounded by a condenser lens, and as a condenser lens, the entire range is covered. There is a proposal of a narrow directivity angle (for example, a directivity angle of about ± 15 °). If the LED display with this configuration is adopted, the light emitted from the LED can be concentrated by the condensing lens within the range of the above-mentioned directivity angle about the optical axis, and the light from the LED display is good even from a long distance. You will be able to see it.

When the above-mentioned LED display is adopted, the light from the LED display can be seen well when viewed from the above range of directivity angles. When viewed from the outside, almost no light can be seen from the LED display. That is, when the LED display is viewed from a long distance, the LED display is viewed from within the range of the directivity angle in most cases, whereas when the LED display is viewed from a short distance, the orientation is almost always viewed. You will see the LED display from outside the corner range. Therefore, it is almost impossible to see the light from an LED display designed mainly for outdoor use at a short distance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an LED display capable of ensuring a certain degree of visibility from a short distance without substantially impairing the visibility from a long distance. The purpose is to do.

According to another aspect of the present invention, there is provided an LED display comprising: a light collecting diode surrounding a front side of a light emitting diode mounted on a substrate; a base portion close to the substrate; and a lens body portion occupying the remaining portion. The directional angle of the base is set larger than the directional angle of the lens body. In the LED display of the second aspect, the light emitting diode is mounted on a predetermined position on the bottom of the reflection cup provided on the substrate. In the LED display of the third aspect, as the condenser lens, the one in which the lens main body and the base are integrally formed is adopted. In the LED display according to claim 4, as a condenser lens, the directivity angle of the lens body is set to be small, and the base portion does not have lens characteristics, and the lens body portion does not have lens characteristics. It uses a combination of a lens with a large directional angle. The LED display according to claim 5,
As the condenser lens, a lens that surrounds the light emitting diode with a space interposed is adopted. LED of Claim 6
The display uses a condenser lens that surrounds the light emitting diode without interposing a space.

According to the LED display of claim 1, in the LED display in which the front of the light-emitting diode mounted on the substrate is surrounded by a condenser lens, the condenser lens is a base portion close to the substrate. , The lens body that occupies the rest is set, and the directional angle of the base is set to be larger than the directional angle of the lens body. Therefore, the lens characteristics within the above predetermined range ensure visibility from a long distance. In addition, it is possible to secure a certain degree of visibility from a short distance due to the lens characteristics outside the predetermined range.
According to the LED display of claim 2, since the light emitting diode is mounted on a predetermined position on the bottom of the reflection cup provided on the substrate, the visibility from a long distance can be improved, and It is possible to secure a certain degree of visibility from a short distance. According to the LED display of the third aspect, since the condensing lens in which the lens body and the base are integrally formed is adopted, it is possible to prevent the configuration of the LED display from becoming complicated. According to the LED display of claim 4, as the condenser lens, the directivity angle of the lens main body is set to be small, and the base portion does not have lens characteristics, and the lens main body portion does not have lens characteristics. , A lens having a large directional angle of the base is combined, so that the production of each lens can be easily achieved, and a region with a small directional angle and a region with a large directional angle can be obtained as a whole. Can be easily obtained. According to the LED display of claim 5, since the light-condensing lens encloses the light-emitting diode with a space interposed, the light-emitting diode can be mounted after the light-emitting diode is mounted. It is also possible to replace the condenser lens with one having different condenser characteristics. In the case of the LED display according to claim 6, since the condenser lens enclosing the light emitting diode without interposing a space is adopted, it is not necessary to provide a condenser lens for each light emitting diode. The required number of condenser lenses can be simultaneously produced by resin molding.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings showing embodiments. FIG. 1 is a schematic vertical sectional view showing an embodiment of the LED display of the present invention. This LED
The display has an LED 2 mounted at a predetermined position on a substrate 1, and a condenser lens 3 is attached by an adhesive or the like so as to cover the front of the LED 2. The substrate 1 is, for example,
This is a metal substrate in which a conductive layer made of copper or the like is provided on the surface of an aluminum plate or the like with an electrical insulating layer interposed therebetween, and a predetermined wiring pattern is formed by subjecting the conductive layer to etching treatment or the like. However, a non-metal substrate may be used, but a metal substrate is preferable in consideration of heat dissipation characteristics and the like. And LED2 is mounted in the predetermined position. The condenser lens 3 is, for example, an LED
2a within a predetermined range centered on a position directly facing 2 (lens main body portion, generically referred to as a portion other than a base portion described later) 3a
The directivity angle of is out of the predetermined range (base part close to the substrate) 3
It is set to be smaller than the directivity angle of b. Here, the lens body 3a and the base 3b may be formed by convex lenses having different degrees, or the former may be formed by a convex lens and the latter may be formed by a concave lens. The range of the lens body 3a is preferably set within a range of ± 45 ° with respect to the optical axis of the LED 2, but may be larger or smaller than this range. In the case of the LED display having the above configuration, of the light emitted from the LED 2, the light guided to the lens body portion 3a of the condensing lens 3 has an optical axis due to the small directivity angle of this portion. The light is focused in the range of a small directivity angle as a reference. Therefore, it is possible to maintain high visibility from a long distance. Further, of the light emitted from the LED 2, the light guided to the base portion 3b of the condenser lens 3 is emitted in a large directional angle range due to the large directional angle in this portion. Therefore, it is possible to achieve a certain degree of visibility from a short distance. That is, it is possible to achieve a certain degree of visibility from a short distance without deteriorating the visibility from a long distance (see FIG. 2 showing directional characteristics).

Embodiment 2 FIG. 3 is a schematic vertical sectional view showing another embodiment of the LED display of the present invention. This embodiment is different from the above-mentioned embodiment in that an inverted truncated cone-shaped recess is formed by machining, drawing, or the like corresponding to the LED mounting planned position of the substrate 1, and the reflection suitable for this recess. Only the point where the cup 4 is provided, the point where the LED 2 is mounted at the center of the bottom of the reflection cup 4, and the point where the condenser lens 3 is provided so as to cover the opening of the reflection cup 4. It is preferable that the reflection cup 4 is, for example, a cup made of metal whose inner surface is formed into a mirror surface. The reflection cup 4 is made separately from the substrate 1, for example, and is fitted and fixed in the recess with an adhesive or the like. However, when the drawing process is adopted, the reflective cup 4 may be formed by leaving the conductive layer corresponding to the recess as it is. The condenser lens 3 is, for example, a reflection cup 4
The directivity angle in the range that directly faces the opening is set smaller than the directivity angle in the range that does not directly face the opening of the reflection cup 4. Therefore, in the case of this embodiment, LE
Most of the light emitted from D2 is reflected directly or by the reflection cup 4 and is guided to a range (lens main body) of the condenser lens 3 which directly faces the opening of the reflection cup 4, so that it is possible to obtain a long distance. The visibility can be improved more than that in the above-mentioned embodiment. Of course, if the visibility for a long distance is increased, the visibility for a short distance will decrease, but the visibility does not become zero, and it is necessary to achieve a certain level of visibility lower than that of the above-mentioned embodiment. You can

[Embodiment 3] FIG. 4 is a schematic vertical sectional view showing still another embodiment of the LED display of the present invention. This embodiment differs from the embodiment shown in FIG. 1 only in that the condenser lens 3 is produced by molding a synthetic resin on the substrate 1 so as to cover the LED 2. As the synthetic resin, it is preferable to use a thermoplastic resin having high translucency, and examples thereof include polycarbonate, polymethylmethacrylate, amorphous polyolefin and TPX. Therefore,
In the case of this embodiment, it is not necessary to attach the condenser lens 3 to each LED 2, and the condenser lenses 3 can be simultaneously produced for a plurality of LEDs 2, so that workability for producing an LED display is improved. It can be increased and the required time can be shortened. In addition, the above-mentioned changes are applied to the second embodiment.
It is also possible to apply to.

Fourth Embodiment FIG. 5 is a schematic vertical sectional view showing still another embodiment of the LED display of the present invention. This embodiment is different from the embodiment of FIG. 1 only in that the condenser lens 3 is composed of two lenses 31 and 32. First lens 3
1 has, for example, a lens characteristic within a predetermined range (lens body portion) 31a centered on a position directly facing the LED 2.
The base 31b does not have lens characteristics. The second lens 32 is, for example, within a predetermined range (lens body portion) 32 centered on a position facing the LED 2.
a does not have lens characteristics, and the base portion 32b has lens characteristics. The directivity angle of the lens body 31a of the first lens is set smaller than the directivity angle of the base portion 32b of the second lens 32. Therefore, in the case of this embodiment, by mounting the first lens 31 and the second lens 32 on the substrate 1 in this order or in the reverse order, a lens similar to the condenser lens 3 of the embodiment of FIG. The characteristics can be obtained. Further, it is also possible to apply the above changes to the second embodiment.

According to the first aspect of the present invention, visibility from a long distance can be ensured by the lens characteristics of the lens body of the condenser lens, and visibility to a certain degree from a short distance can be ensured by the lens characteristics of the base. The unique effect of being able to secure the property is exhibited. The invention of claim 2 has a unique effect that the visibility from a long distance can be enhanced and a certain degree of visibility from a short distance can be secured. The invention of claim 3 has a unique effect that it is possible to prevent the configuration of the LED display from becoming complicated. The invention of claim 4 has a unique effect that each lens can be easily manufactured, and a region having a small directivity angle and a region having a large directivity angle can be easily obtained as a whole. The invention of claim 5 has a peculiar effect that a condenser lens can be provided after mounting the light emitting diode, and the condenser lens can be replaced with one having a different condenser characteristic. According to the invention of claim 6, it is not necessary to provide a condenser lens for each light emitting diode, and for example, a required number of condenser lenses can be simultaneously produced by molding a synthetic resin.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing an embodiment of an LED display of the present invention.

FIG. 2 is a diagram showing directional characteristics.

FIG. 3 is a schematic vertical sectional view showing another embodiment of the LED display of the present invention.

FIG. 4 is a schematic vertical sectional view showing still another embodiment of the LED display of the present invention.

FIG. 5 is a schematic vertical sectional view showing still another embodiment of the LED display of the present invention.

[Explanation of symbols]

1 substrate 2 LED 3 condensing lens 3a, 31a, 32a lens body 3b, 31b, 32b base 4 reflection cup 31 first lens 32 second lens

Claims (6)

[Claims] 1. An LE comprising a light-emitting diode (2) mounted on a substrate (1) and a front surface of which is surrounded by a condenser lens (3).
In the D display, the condensing lens (3) is divided into a base portion (3b) close to the substrate (1) and a lens body portion (3a) occupying the remaining portion, and the directivity angle of the base portion (3b) is set. An LED display characterized by being set to be larger than the directivity angle of the lens body (3a). 2. The LED display according to claim 1, wherein the light emitting diode (2) is mounted at a predetermined position on the bottom of the reflection cup (4) provided on the substrate (1). 3. The LED display according to claim 1, wherein the condensing lens (3) has a lens body (3a) and a base (3b) formed integrally. 4. The condenser lens (3) has a lens body (31a) having a small directivity angle and a base (31).
(b) does not have lens characteristics, and lens (3) in which the lens body (32a) does not have lens characteristics, and the base (32b) has a large directivity angle.
The LED display according to claim 1 or 2, wherein the LED display is used in combination with (2). 5. The LED display according to claim 1, wherein the condensing lens (3) surrounds the light emitting diode (2) with a space interposed. 6. The LED display according to claim 1, wherein the condenser lens (3) surrounds the light emitting diode (2) without interposing a space.