JPH0465006A - Illumination device - Google Patents

Abstract

PURPOSE:To miniaturize an illumination section by guiding the light from a light source provided separately from an illumination device with an optical fiber to project it from a light projection section, reflecting it to the opening side of a main body with a reflecting mirror, irregularly reflecting it in a diffusion plate, and radiating it to the outside. CONSTITUTION:Laser light is emitted from a light projection section 40 at various angles via an optical fiber, it is reflected by the reflecting face 50 of a reflecting mirror 48 in the wider direction, and it is irregularly reflected in a diffusion plate 54 and further diffused. The diffusion plate 54 is illuminated nearly uniformly, and an object on the diffusion plate 54 is uniformly illuminated from the rear side. No light source is integrally provided on an illumination device, thus the structure is simplified and can be miniaturized, and the temperature rise based on the heating of the light source can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lighting device, and particularly to miniaturization thereof.

Conventional technology lighting devices include fluorescent lamps and light emitting diodes (LEDs).
) etc. have traditionally been used. Fluorescent lamps contain mercury vapor (Hg) inside a glass tube whose inner surface is coated with phosphor.
) and argon (A r ) are enclosed,
The light emitted by the discharge inside the tube is diffusely reflected within the glass tube and diffused to the outside, thereby illuminating the object. The glass tube usually has a rod shape, a ring shape, or the like, and is selected depending on the location to be illuminated and the shape and size of the object. Additionally, if a reflector is attached to the glass tube on the opposite side of the object, most of the light emitted from the glass tube is reflected by the reflector toward the object. Illuminance can be increased.

A light emitting diode is a diode that emits light when a voltage is applied to a PN junction made in a light guide such as a glass container, and provides illumination by diffusing the light within the container. .

Light emitting diodes are used in pilot lamps, etc.
A plurality of light emitting diodes are arranged and used as a lighting device.

Problems to be Solved by the Invention However, in lighting devices such as the above-mentioned fluorescent lamps and light emitting diodes, the light source and the lighting section that illuminates with the light of the light source are provided integrally, so the lighting device There was a problem that the size was large.

In view of this problem, the present invention has been achieved with the objective of reducing the size of the illumination section (hereinafter referred to as a lighting device) by separating the illumination section from the light source.

Means for Solving the Problems The lighting device according to the present invention includes (a) a main body having a recessed portion having a circular cross-sectional shape, and (c) a ring shape formed along the inner circumferential surface of the recessed portion. (C) a light emitting section formed rotationally symmetrically with respect to a vertical line passing through the center of the recess; and (d) a diffuser plate attached to cover the opening of the recess of the main body.

The shape of the reflecting mirror may be rotationally symmetrical with respect to the vertical line passing through the center of the recess, and may be a spherical, paraboloid, hyperboloid, or
It is considered to be a triangular pyramid surface, etc.

Function In the lighting device configured as described above, light is guided by an optical fiber from a light source provided separately from the lighting device and emitted from the light emitting section, and the light is reflected by a reflecting mirror on the opening side of the main body. reflected to. The reflected light is diffusely reflected within the diffuser plate and radiated to the outside.

Effects of the Invention According to the present invention, since the illumination device does not integrally include a light source, the structure can be simplified and downsized. In addition, most of the light is reflected toward the opening of the main body by the reflective mirror, making it more efficient.Furthermore, since no light source is installed inside the lighting device, the temperature rise due to the heat generated by the light source is reduced. It will be done.

The device of the present invention uses a fluorescent lamp, a laser emitter, or a light source as a light source.
Various lamps such as halogen lamps can be used. In particular, when a laser emitter or halogen lamp is used as a light source, there is no flicker noise that tends to occur with fluorescent lamps, and the light intensity can be adjusted at the light source, so the illuminance of the lighting device can be adjusted. Can be easily adjusted.

Therefore, the device of the present invention can be used not only as a normal illumination device for illuminating an object from the outside, but also to obtain a silhouette by placing the object on a diffuser plate. It can also be used as a backlight for liquid crystal displays used in automobile instruments and the like.

EXAMPLE Hereinafter, an example in which the present invention is applied to a lighting device for an image processing device will be described in detail based on the drawings.

In FIGS. 1 and 2, lO is the main body of the lighting device. The main body 10 is made up of a bottom member 12 and a cover member I4 fitted thereto so as to be rotatable and movable in the vertical direction. A recess 16 having a circular cross-sectional shape and opening upward is formed in the center of the bottom member 12, and a through hole 18 concentric with and having approximately the same diameter as the recess 16 is also formed in the cover member 14. As a result, the main body 10 has a cylindrical shape with a bottom.

For manufacturing reasons, the cover member 14 is made up of two members, a first member 20 and a second member 22, which are glued together. A portion 26 is formed. The cylindrical part 26 has three elongated parts 28 arranged at equal intervals, which are inclined upwardly from the right to the left.
The book is formed. Furthermore, female screw holes 30 are formed at three equally spaced locations on the outer circumferential surface 24 of the bottom member 12, and three screws 32 are inserted into each elongated hole 28 and then screwed together. . The cover member 14 is supported by the shaft portion of the screw 32 coming into contact with the cam surface 36 of the elongated hole 28 . Therefore, if the cover member 14 is rotated clockwise along the cam surface 36, that is, in the direction shown by the arrow in FIG. At the same time, when the screw 32 is tightened into the female threaded hole 30, the cover member 14 is fixed to the bottom member 12.

First member 20 of cover member 14. A light emitting section 40 is provided between the second members 22. The light emitting part 40 is formed by fixing one end of a large number of optical fibers with a synthetic resin or the like with each end facing toward the center of the recess 16.
It has a ring shape along the inner circumferential surface 42 of the recess 16 of No. 2. An annular hollow portion 44 is formed in the cover member 14 by the first member 20 and the second member 22 . The hollow part 44 communicates with a guide part 46 formed in a state protruding from the first member 20 as shown in FIG.
The light is collected through the guide portion 46 and connected to a laser light source (not shown).

A reflective mirror 48 is disposed within the recess 16 . The reflecting mirror 48 has a spherical reflecting surface 50, and the recess 1
It is formed rotationally symmetrically with respect to the center line l of 6. Therefore, the light emitted from the light emitting section 40 is transmitted to the reflecting mirror 4.
8 and is reflected toward the opening side of the recess 16, that is, toward the opening of the main body IO.

The opening of the main body 10 is covered by a diffusion plate 54 attached to the first member 20 of the cover member 14. Diffusion plate 5
4 has a disk shape concentric with the concave portion 16, and the light reflected by the reflective surface 50 of the reflective mirror 48 is diffusely reflected within the diffuser plate 54 and diffused.

In the lighting device configured as above, the diffuser plate 54
If an object such as an electronic component is placed on top, a silhouette of the object can be obtained. The laser light is emitted from the light emitting section 40 at various angles as shown in FIG. It can be further diffused. Therefore, the entire diffuser plate 54 is illuminated almost uniformly, and the object on the diffuser plate 54 is uniformly illuminated from the back side. In FIG. 3, light is shown by a plurality of straight arrows, but in reality, the light is refracted in a complicated manner within the diffuser plate 54 and radiated in random directions. An imaging device (not shown) is installed above the lighting device, and the silhouette of the object is converted into an electrical signal and subjected to image processing, thereby converting the outline of the object into electronic information.

If you want to change the area where the diffuser plate 54 shines, or if you want to make the illuminance uniform in a desired area, you can loosen the three screws 32 and rotate the cover member 14. Due to the action of the cam surface 36, the reflective surface 5 for the light emitting section 40 is
Since the relative position of 0 changes, the direction of light reflection on the reflecting surface 50 changes, and the illuminated area of the diffuser plate 54 changes. If the cover member 14 is fixed to the bottom member 12 by tightening the screw 32 at a desired position, a good silhouette of the object can be obtained.

It is also possible to implement the invention in the manner shown in FIGS. 4 to 7. Note that the same members as those in the above embodiment are given the same reference numerals, and detailed explanations will be omitted.

In the embodiment of FIG. 4, the cover member 14 of the main body 60
An elongated hole 64 extending parallel to the center line l is formed in the cylindrical portion 26 of the cylindrical portion 26 in place of the inclined elongated hole 28, and the cover member 14 is fixed to the bottom member 12 by a screw 66. . Therefore, by loosening the screw 66, the cover member 14
If you move the mirror in the direction parallel to the center line 2, the reflection mirror 4
8 relative position to the light irradiation unit 40 can be adjusted.

In the embodiment of FIG. 5, the bottom member 72 and the cover member 7
4 are integrally fixed to form the main body 76. A through hole 78 is formed in the cover member 74, while a female screw hole 80 is formed in the bottom member 72, and the reflecting mirror 4 is formed in the bottom member 72.
A disk-shaped support plate 82 that supports 8 is screwed together. A male threaded portion 84 corresponding to the female thread 680 is formed on the outer peripheral surface of the support plate 82, and a recess 86 is formed in the main body 76 by screwing the support plate 82 into the female thread 680. An adjustment knob 8'8 is fixed to the lower surface of the support plate 82, and by rotating this adjustment knob 88,
Support plate 82 is the center line! Female screw 68 while rotating around
0, and the position of the reflecting mirror 48 with respect to the light emitting part 40 changes.

Further, in the embodiment of FIG. 6, the main body 90 has a recess 9
1 and a cover member 94 are connected by four screws 96 (only two are shown in the figure). The screw 96 is screwed into a female threaded hole 98 formed in the bottom member 92, and by rotating the screw 96 and adjusting the amount of threading into the female threaded hole 98, the position of the cover member 94 with respect to the bottom member 92 can be adjusted. is starting to change. In addition, there are four compression coil springs 100 between the bottom member 92 and the cover member 94! 96, and the play of the screw 96 is eliminated.

Furthermore, in the embodiment shown in FIG. 7, as in the embodiment shown in FIG. , a disk-shaped support plate 114 that supports the reflective mirror 48 is fitted so as to be movable in the vertical direction. The bottom wall 116 of the recess 110 has a center line! A screw 118 is inserted upwardly coaxially with the female screw hole 1 formed in the support plate 114.
22. Therefore, when the screw 118 is rotated, the support plate 114 moves up and down within the recess 110, and the light emitting portion 40 of the reflective mirror 48 supported by the support plate member 114
The relative position to changes.

Note that a compression coil spring 124 is disposed between the support plate 114 and the bottom wall 116 of the recess 110, and the screw 11
8 play is excluded.

In the above embodiments, the relative position of the reflecting mirror 48 with respect to the light emitting part 40 is adjustable, but it is also possible to make these relative positions constant, which further simplifies the structure of the lighting device. be able to.

Furthermore, in the above embodiment, one light source was provided for one reflecting mirror, but it is also possible to provide multiple light sources for one reflecting mirror, or conversely, for one light source to be provided with one light source. It is also possible to provide a plurality of reflection mirrors, and it is also possible to provide a plurality of reflection mirrors in one lighting device.

In addition, various modifications may be made based on the knowledge of those skilled in the art.

The invention can be practiced in modified forms.

[Brief explanation of drawings]

FIG. 1 is a front view (partially in section) of a lighting device that is an embodiment of the present invention. FIG. 2 is a plan view of the above device, and FIG. 3 is an explanatory diagram conceptually showing the illumination principle of the above device. FIG. 4, FIG. 5, FIG. 6, and FIG. 7 are front views (partially in section) showing illumination devices that are different embodiments of the present invention. 10: Main body 16: Recessed part 40: Light emission part 48: Reflection mirror 54: Diffusion plate
60, 76: Main body 86: Recess 90: Main body 91: Recess 108: Main body 110: Recess

Claims (1)

[Scope of Claims] A main body having a recessed portion having a circular cross-sectional shape, and a plurality of light beams forming a ring shape along the inner peripheral surface of the recessed portion, each of which emits light toward the center of the recessed portion. a light emitting portion including a fiber; a convex reflecting mirror formed rotationally symmetrically with respect to a vertical line passing through the center of the recess, and reflecting light emitted from the light emitting portion toward the opening side of the recess; and a diffuser plate attached to cover the opening of the recess of the main body.