JP2002056706A - Illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device which gives illumination distribution of high energy density or which gives changes to the illumination distribution shape in the illumination device in which plural luminous material elements are used. SOLUTION: Optical elements (for examples, lenses) to make a pair with numerous luminous material elements (for example, light emitting diode) are arranged, to enhance the energy density. By controlling light divergence angle of unit luminous material and emission directions, the energy density are locally enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device used for a camera, an electronic camera, a video camera, a photographing inspection device, a processing device, and the like.

[0002]

2. Description of the Related Art The present invention relates to a lighting device for photographing and processing equipment such as a camera, an electronic camera, a video camera, and the like, and an illuminating device for curing an adhesive by light. I do. However, in general, the luminous body has a fixed divergence directional characteristic and emission direction of light, so it is difficult to easily obtain a high concentration of energy or a linear, circular, dot, square, or other distribution on a certain irradiation surface. There is.

Conventionally, this has been attempted to achieve the above-mentioned object with an optical element having one function. There were difficulties in trying to realize these problems without clarifying them.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to combine a large number of general light emitting elements having predetermined light divergence directivity characteristics and emission directions, and to perform functions of unit optical elements arranged in parallel. Controlling the divergence angle from the light source by combining them.Controlling the traveling direction of light from each unit light source, the strong light intensity distribution is point-like, circular,
An object of the present invention is to propose a lighting device for forming a straight line or a square.

[0005]

This and other objects are attained by the present invention which is defined below as (1) to (5).

(1) It has a plurality of unit light sources and an illumination optical system composed of a plurality of unit optical elements, and irradiates the plurality of optical elements by changing the light divergence angle and / or the emission direction of the light source. An illumination device that performs strong irradiation at a specific portion or a specific shape of a surface.

(2) In the illumination device described above, the unit luminous element and the unit optical element correspond to each other, and the plurality of optical elements are a lens, a diffractive optical element, a cylindrical lens, or a toric lens, and are point-like, circular, or linear. A lighting device that concentrates light energy on the surface and obtains high energy locally.

(3) In the above-mentioned lighting device, a lighting device is provided with a new optical element for adding a unit lens for changing a light emitting direction from a unit light source and for concentrating light energy more locally.

(4) In the lighting device of the above (2), by giving a regulated eccentricity to the paired unit light emitter and unit lens, the light energy can be concentrated more locally to obtain high energy. .

(5) An illuminating device in which a light guide is attached to the illuminating device.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lighting device according to the present invention. FIG. 1 is a perspective view showing a first embodiment of the lighting device of the present invention.

The light source is not particularly limited. For example, a light source section is constituted by arranging a large number of light sources such as light emitting diodes and laser diodes which are as close to point light sources as possible. By associating each unit lens with each of the luminous bodies, the divergence angle of the unit luminous bodies is controlled and the light collecting efficiency is improved. FIG. 1 shows an arrangement in which a plurality of lenses 2 corresponding to a large number of light emitting diodes 1 are arranged. This principle is, in the light emitting diode 1 of a definite light diverging directional characteristics and distribution with spreading W _O of the light when irradiated surface to be irradiated is as in FIG. 2 in. By placing the lens 2 as shown in FIG. 3, the energy density in the vicinity of the center can irradiate the narrow range by controlling the light divergence directivity angle W _L can be increased higher P _L than P _O of FIG. The embodiment of FIG. 1 uses this principle to concentrate energy as an aggregate. The lens unit 1 may be integrally formed as a whole. Further, as shown in FIG. 4, it may be attached to each unit light source. In FIG. 1, light emitted from a large number of light emitters 1
This is an illumination device in which the exit angle is reduced by the lens 2, the energy density at the center is concentrated, and the energy near the center is increased by irradiating a large number of light beams onto the irradiation surface. Specific numerical examples are shown. Divergence angle of 45 degrees (total angle)
Emitting diode when attached acrylic lens, the unit lens is a r a lens thickness d ₂ and 1mm had strength increases about 10 times in the case where the irradiation surface center with a radius of 2.5 mm. The distance between the lens and the light emitting diode is 0.2m
m to 1.5 mm was good.

FIG. 5 is a perspective view showing a second embodiment of the illuminating device according to the present invention. Illumination in which a plurality of light emitting diodes 1 or laser diodes are arranged in parallel with a cylindrical lens 6 to improve illumination efficiency. It is an example of an apparatus. The set of cylindrical lenses may be integrally formed. Specific examples of numerical values include a radius of 2.5 mm and a thickness of 1
When the mm cylindrical lens was used, a linear light distribution with an increased intensity of about three times at the center was obtained.

FIG. 6 is a perspective view showing a third embodiment of the illuminating device according to the present invention, in which a plurality of light emitting diodes 1 or laser diodes are arranged in a square and cylindrical lenses 6 are arranged in a square to obtain square illumination light. This is a lighting device in which cylindrical lenses 6 are arranged corresponding to the light emitting diode groups arranged in a square shape to reduce the divergence angle of the light emitting diode 1 and obtain square illumination light having a high energy density.

FIG. 7 shows a third embodiment of the lighting device according to the present invention. In the front view, the unit lens 2a corresponding to the unit light source 1 is given eccentricity, and the divergence angle and the emission direction are controlled, so that the light collection degree is further improved as compared with the first embodiment. The amount of eccentricity is proportional to the eccentricity from the center of the light source of the assembly in order to condense light at the center. When it is desired to condense light intensity in a straight line, eccentricity is given symmetrically with respect to the line. The single lens may be replaced with a cylindrical lens. The unit lens 2a reduces the diffusion angle of light from the arranged light emitters and gives eccentricity corresponding to a function depending on the case. The amount of eccentricity is in the direction in which light is concentrated at the center of a large number of light emitters. The amount of light bending. The light passes through the lens 2a to increase the light density, and is turned toward the center to irradiate a part of the irradiation surface in cooperation.

FIG. 8 is a front view showing a fourth embodiment of the illuminating device according to the present invention, in which a light emitting diode 1 and a pair of a single lens 2 are shown.
The eccentricity is zero, the divergence angle of the unit light source 1 is controlled, and a large-diameter lens 2b is inserted after the aggregate of the unit lenses 2 to control the emission direction from the unit lens 2, thereby condensing light. This is a lighting device that collects energy at one point and increases the energy density.

FIG. 9 shows a fifth embodiment in which the divergence angle lens group 2 of unit luminous bodies of a large number of luminous bodies is reduced when the divergence angle of one of the luminous bodies is large and the loss is large to make the luminous body enter the light guide. The lens group 2 is used to control the divergence angle at which light is effectively incident on the aperture of the light guide, and the emission direction from the unit luminous body 1 and its paired unit lens 2 is controlled by the lens 2b. This is a lighting device that allows light to effectively enter the aperture of the light light guide 8 to increase the coupling efficiency to the light light guide 8 and irradiate far away. The light distribution on the irradiation surface may be controlled by giving an appropriate curvature to the exit surface of the light guide.

In the above embodiments of the present invention, examples of the lens and the cylindrical lens are described. However, optical elements such as a toric lens and a diffractive optical element may be used.

[0019]

As described above, according to the lighting apparatus of the present invention, the divergence angle and the directional direction of the luminous body whose divergence and directional characteristics of light are reduced are controlled by the optical element.
It has become possible to provide a lighting device that can be applied to various fields such as concentrating a light distribution pattern and energy density. In light processing and lighting, an increase in light intensity has an important meaning, and processing, a chemical reaction, and capturing of an image become impossible unless a certain energy or more can be secured. Lighting that can broaden the range of applications such as adhesives and photo-curing by optical processing and photochemical reaction by controlling the light intensity distribution by controlling the light intensity distribution by efficiently condensing a large number of light sources with this device. The equipment could be provided. When a plurality of existing light sources are used in order to efficiently input light from a large number of light sources to the light guide, the N
Below A, an effective method for suppressing the light divergence angle from the light source and dramatically increasing the coupling efficiency to the light guide could be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration example of a lighting device of the present description.

FIG. 2 is a perspective view showing an illumination example for explaining the principle of the present invention.

FIG. 3 is a perspective view showing a basic configuration example of the present invention.

FIG. 4 is a front view showing a basic configuration example of the present invention.

FIG. 5 is a perspective view showing another configuration example of the lighting device of the present invention.

FIG. 6 is a perspective view showing another configuration example of the illumination device of the present invention.

FIG. 7 is a front view showing another example of the configuration of the lighting device of the present invention.

FIG. 8 is a front view showing another example of the configuration of the illumination device of the present invention.

FIG. 9 is a front view showing another configuration example of the lighting device of the present invention.

[Explanation of symbols]

1 Light-emitting body such as light-emitting diode or laser diode 2 Lens or lens group 2a Lens eccentric with light-emitting body 2 Lens for controlling the traveling direction of light from B light source 3 Surface to be irradiated 4 Surface to be irradiated by unit light source 5 Light intensity distribution on the surface to be illuminated by the entire light source 6 Cylindrical lens group (lenticular lens) 7 Cylindrical lenses arranged in a square 8 Light guide

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Claims (5)

[Claims] 1. An illumination optical system comprising: a plurality of unit light sources; and an illumination optical system comprising a plurality of unit optical elements. It is an illumination device that performs strong irradiation at a specific portion or a specific shape. 2. The lighting device according to claim 1, wherein the unit light emitter and the unit optical element correspond to each other, and the plurality of optical elements are a lens, a diffractive optical element, a cylindrical lens, or a toric lens; 2. The lighting device according to claim 1, wherein the light energy is concentrated linearly to obtain locally high energy. 3. The lighting device according to claim 2, further comprising a unit lens for changing a light emitting direction from the unit light source, and a new optical element for concentrating light energy more locally. 4. An illuminating device according to claim 2, wherein the unit luminous body and the unit lens which form a pair in the illuminating device are regulated eccentrically to concentrate light energy more locally and obtain high energy. 5. An illuminating device having a light guide attached to the illuminating device.