JP3173083U - Light emitting device - Google Patents

Abstract

A light emitting device capable of extracting light from a single light source at multiple points is provided.
A light-emitting device includes a light-emitting surface of a light source such as an LED and a transparent adhesive having a refractive index substantially the same as that of the light-guiding body, the end surface of a transparent glass or resin rod-like or string-like light-guiding body. Alternatively, it is configured by joining with a solvent and supplying light, and joining the light transmitting body with the transparent adhesive or solvent at a required light emitting position on the side surface of the light guide. The light transmitting body is made of transparent or colored glass or resin of beads or polyhedrons, and leaks due to refraction and transmission effects from the adhesive or the like on the bonding surface, but the light is used to act as a light emitting body.
[Selection] Figure 1

Description

In the present invention, light emitted from a light source such as a light emitting diode (LED), a cold cathode tube (CCFL), or an organic EL is led into a transparent glass or resin rod-like or string-like light guide, and is appropriately separated. The present invention relates to a device that emits light freely from the surface.

An optical fiber is a representative device that guides light from a light source to a remote location. This is made by using transparent glass or resin as thin fiber fibers, and using circular cross sections that are concentric with each other and having different refractive indexes. It reaches the terminal up to the target without leaking in the middle. It is mainly used in communication systems to transmit optical signals, bundle them in large numbers, and transmit endoscopes or sunlight. In a backlight type liquid crystal display (LCD), a light source such as an LED, CCFL, or organic EL is provided on the side of a transparent glass or acrylic plate, and the light emitted from the light source is placed inside to reflect the light. The liquid crystal is irradiated from the back as a planar light source that is taken out from the surface of the light guide plate that is guided farther away. In many cases, the light guide plate is devised so as to extract light uniformly on the front surface by engraving fine irregularities on the front surface or back surface of the light guide plate or printing a pattern with special ink having a good light diffusion effect. In general, advanced techniques are required for materials, construction and manufacturing methods.

For the purpose of illuminating an arbitrary point of a rod-like or string-like object, there is no conventional appropriate method. As an approximate method, light emitting bodies such as LEDs are provided one by one at the required light emitting point position of the object. For this reason, when emitting many points, the same number of light emitters such as LEDs are required, and these electric wires and attachments tend to be complicated and heavy. For this solution, a light emitter that can extract light from a single light source at multiple points is desired. As described in the previous section, this purpose uses the principle of light transmission by internal reflection of an optical fiber or LCD for the transmission of light, and uses a novel device that is completely different from the conventional method for the input and extraction of light. It tries to realize a simple device.

In the light emitting device of the present invention, a light emitting surface of a light source such as an LED and an end surface of a transparent glass or resin rod-like or string-like light guide are joined with a transparent adhesive or solvent having a refractive index close to this, and light is emitted. The light transmitting body is joined to the required light emitting position on the surface of the light guide with the same transparent adhesive or solvent as described above. The light transmitting body is made of transparent or colored glass or resin of beads or polyhedron, and leaks due to the refraction and transmission effect from the adhesive or the like on the bonding surface, but the light is used to act as a light emitting body. By providing a plurality of light transmitting bodies in one light guide, the problem described in the previous section is solved.

Since the light emitting device according to the present invention has a simple structure and can obtain the light emitting effect from a large number of light emitters on the surface of the light guide using the light emitted from one light source, the device can be simplified and the cost can be reduced. Become. It is also easy to form a single unit by entwining or weaving a plurality of these. For this reason, in the case of stick-shaped items, nighttime warning bars, warning light bars and light items such as Noren in a row, and in the case of string-shaped items, accessories such as necklaces, bracelets, earrings, or decorations in the form of a mall or surface (textile) It will be possible to cultivate products in a wide range of new fields such as utility products.

Hereinafter, the present invention will be described with reference to application examples shown in FIGS. FIG. 1 is a schematic sectional side view of a light emitting device, FIG. 2 is a schematic diagram of an application example of this device to Nolene, and FIG. 3 is a schematic diagram of a joining example of a plurality of light emitting devices. In FIG. 1, a light-emitting device (1) mainly includes a light source (2), its light-emitting surface (3), and a long thin rod-like or string-like light guide (5) connected coaxially along a center line indicated by AA. Configured. At this time, the light guide (5) is joined to the light emitting surface (3) by an adhesive (4) with one end thereof as a light incident end (51). The light guide (5) has a light transmitting body (6) on the surface up to the light exit end (52) opposite to the light entrance end (51), and an adhesive (4 ) And the light emitted from this is made to act like a light transmitting body (6) light emitting body. Here, the light source (2) is a self-luminous element using electric power such as LED, CCFL or organic EL, or transmitted light such as the light emitting end (52), and the light emitting surface (3) is a protective cap or lens in the LED. Consists of. The light guide (5) is made of a highly transparent material such as glass or acrylic, and the adhesive (4) is made of a transparent material having a refractive index close to that of the light guide (5). As a result, the light emitted from the light emitting surface (3) passes smoothly through the adhesive (4) having a refractive index close to the light guide (5). At this time, when the light incident end portion (51) and the light emitting surface (3) are made of the same resin material such as acrylic, they may be welded with a solvent instead of the adhesive (4). Note that a guide (not shown) may be provided around the adhesive (4) to facilitate bonding. The light transmitting body (6) is transparent or colored, and is made of beads, plates or polyhedral or spherical glass or resin material that are cut or molded to produce a photorefractive effect, and the surface of the light guide (5). Are bonded by adhesion or welding as described above. Further, the light transmitting body (6) can be joined through a light guide (5) so as to have a hollow shaft such as a bead (the leftmost light transmitting body (6) in FIG. 1 shows an example thereof). ). The light guide (5) may be a flexible body having a string-like flexibility other than the rod-shaped rigid body. The same configuration is possible using a resin such as glass fiber, silicon rubber or vinyl chloride.

FIG. 2 shows an example in which a plurality of light emitting devices are arranged in a line to constitute nolene. Each light-emitting device (1) is arranged so that the edge part may be hold | maintained with a holder (10) and may comprise one surface. If necessary, if the material of the light emitting device (1) is a rod-like material having high rigidity, the holding part can be swung by a hinge or the like, and if it is a string, it is fixed. The light source of each light emitting device (1) is supplied with power to a self-luminous body such as an LED (not shown). It is also possible to draw a character or a pattern as shown in the figure by appropriately arranging a light transmitting body (6) in each light emitting device (1). It can be applied to various display effect media as well as Noren in various combinations by selecting color, brightness, light emission timing and shape. For example, by twisting a plurality of string-like light-emitting devices (1) and changing their emission color and emission timing, the effect of changing the light emission state of the side surface from moment to moment is obtained as a whole.

FIG. 3 shows an example in which a plurality of light emitting devices (1) are joined. Two light guides are formed by joining the light exit end (52) at the other end of the light guide (5) having the light source (2) to the side surface of another light guide (5) using an adhesive (4). The body (5) acts integrally, and the light transmitting body (6) joined to each acts as a light emitter. In this way, it is also possible to connect the light guides (5) through the adhesive (4) at the joint and combine them together to form a light emitting device with a complicated shape. Even if a solvent is used instead of the adhesive (4), the same is true. For example, one light emitting device (1) is provided in the nolene holding portion (10) of FIG. 2, and a plurality of string-like light guides (5) are bonded and joined to the light guide (5). It is also possible to simplify the structure.

Schematic side sectional view of a light emitting device structure according to the present invention Schematic of application example of this device to Noren Schematic example of joining of multiple light emitting devices

(1) Light emitting device (2) Light source (3) Light emitting surface (4) Adhesive (5) Light guide (6) Light transmitting body (51) Light incident end (52) Light exit end (10) Holder

Claims (4)

Light emitting diodes (LEDs), cold cathode fluorescent lamps (CCFL), light emitting surfaces of light sources such as organic EL or light emitting surfaces of other light emitters, and end faces of light guides made of transparent glass or resin rods or strings Are bonded with a transparent adhesive or solvent having substantially the same refractive index, and are transparent or with a transparent adhesive or solvent of the same kind as described above at a position appropriately separated from the end on the side surface of the light guide. A bead, plate, or polyhedron or sphere-shaped light transmissive body colored with light transmission and optionally having a photorefractive effect is bonded, and the light input from the light source to the light guide is transmitted through the interior. A light-emitting device that emits light from a light transmitting body through a portion so that the light transmitting body shines. A light-emitting device obtained by arranging a plurality of light-emitting devices according to claim 1 in the same row to obtain a planar light-emitting effect. A light-emitting device in which a plurality of light-emitting devices according to claim 1 are entangled or woven together to emit light integrally. The light emitting body light emitting end portion of the light emitting device according to claim 1 is joined to a side surface or an end surface of the light guiding body of a light emitting device similar to the present invention by a transparent adhesive or solvent having substantially the same refractive index. A light emitting device.

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