JP2979084B2 - Lighting equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device, and more particularly to a miniaturization thereof.

2. Description of the Related Art Fluorescent lamps and light-emitting diodes (LE
D) etc. are conventionally used. Fluorescent lamps contain mercury vapor (H) inside a glass tube with a phosphor coated on the inside.
g) and argon (Ar) are sealed, and light emitted by discharge in the tube is diffusely reflected in the glass tube and diffused outside, thereby illuminating the object. The glass tube usually has a rod shape, a ring shape, or the like, and is selected according to an object place to be illuminated, the shape and size of the object, and the like. In addition, when a reflector is attached to the glass tube at a position opposite to the object, most of the light emitted from the glass tube is reflected toward the object by the reflector. Illuminance is increased.

A light emitting diode is a diode that emits light when a voltage is applied to a PN junction formed in a light guide such as a glass container, and illuminates when light is diffused in the container. . The light emitting diode is used for a pilot lamp or the like, and also used as a lighting device in which a plurality of light emitting diodes are arranged.

Problems to be Solved by the Invention However, in a lighting device such as a fluorescent lamp or a light-emitting diode, a light source and a lighting unit that illuminates with light from the light source are provided integrally, so that the lighting device is There was a problem that it became large.

SUMMARY OF THE INVENTION In view of this problem, the present invention has been made to solve the problem of reducing the size of an illumination unit (hereinafter, this unit is referred to as an illumination device) by separating the illumination unit from a light source.

Means for Solving the Problems The lighting device according to the present invention comprises: (a) a main body having a concave portion having a circular cross section; and (b) a ring shape along the inner peripheral surface of the concave portion. And (c) a light emitting portion having a plurality of optical fibers for emitting light toward the center of the concave portion, and (c) the light emitting portion formed to be rotationally symmetric with respect to a vertical line passing through the center of the concave portion. And (d) a diffuser plate attached so as to cover the opening of the concave portion of the main body.

The shape of the reflection mirror may be any shape as long as it is rotationally symmetric with respect to a vertical line passing through the center of the concave portion, and may be a spherical surface, a paraboloid, a hyperboloid, a triangular pyramid, or the like.

In the lighting device configured as described above, light from a light source provided separately from the lighting device is guided by the optical fiber and emitted from the light emitting portion, and the light is reflected by the reflecting mirror on the opening side of the main body. Is reflected to The reflected light is irregularly reflected in the diffuser and emitted to the outside.

Effect of the Invention According to the present invention, the lighting device does not integrally include the light source, so that the structure is simplified and the size can be reduced. In addition, since most of the light is reflected toward the opening of the main body by the reflecting mirror, the efficiency is high. Further, since no light source is provided in the lighting device, the temperature rise due to the heat generated by the light source can be reduced. Can be

The device of the present invention can use various lamps such as a fluorescent lamp, a laser radiator, and a halogen lamp as a light source. In particular, when a laser radiator or a halogen lamp is used as a light source, there is no flicker noise that is easily generated in a fluorescent lamp, and the light intensity can be adjusted in the light source, so that the illuminance of the lighting device can be easily increased. Can be adjusted.

Therefore, the device of the present invention can be used as a normal lighting device for illuminating an object from the outside, and it is also possible to obtain a silhouette by placing the object on a diffusion plate. Further, it can be used as a backlight of a liquid crystal display used for an instrument of an automobile or the like.

Embodiment Hereinafter, an embodiment in which the present invention is applied to a lighting device for an image processing apparatus will be described in detail with reference to the drawings.

1 and 2, reference numeral 10 denotes a main body of the lighting device. The main body 10 includes a bottom member 12 and a cover member 14 fitted to the bottom member 12 so as to be rotatable and vertically movable. At the center of the bottom member 12, the cross-sectional shape is circular,
The main body 10 has a bottomed cylindrical shape by forming a concave portion 16 opened upward and a through hole 18 concentric with the concave portion 16 and having substantially the same diameter as the concave portion 16 in the cover member 14.

The cover member 14 is formed by bonding two members of a first member 20 and a second member 22 for convenience of manufacture, and the second member 22 has a cylindrical portion fitted to the outer peripheral surface 24 of the bottom member 12. 26 are formed. In the cylindrical portion 26, three long holes 28 are formed at equal intervals, which are inclined in a direction ascending from the right to the left. The outer peripheral surface 24 of the bottom member 12 has three
A female screw hole 30 is formed at a location, and three screws 32
After being inserted into each elongated hole 28, they are screwed together. The cover member 14 is supported by the shaft of the screw 32 abutting on the cam surface 36 of the elongated hole 28. Therefore, the cover member
If 14 is rotated clockwise along the cam surface 36, i.e. in the direction indicated by the arrow in FIG.
When the screw 32 is screwed into the female screw hole 30 when the screw 32 is screwed into the female screw hole 30, the cover member 14 is fixed to the bottom member 12 when rotated in the opposite direction.

A light emitting section 40 is provided between the first member 20 and the second member 22 of the cover member 14. The light emitting section 40 is one in which one end of each of the large number of optical fibers is fixed with a synthetic resin or the like in a posture facing the center of the concave portion 16, and along the inner peripheral surface 42 of the concave portion 16 of the bottom member 12. It has a ring shape. Cover member 14
, An annular hollow portion 44 is formed by the first member 20 and the second member 22. The hollow portion 44 has a guide portion 46 formed so as to protrude from the first member 20 as shown in FIG.
All the optical fibers extending from the light emitting section 40 are collected in the guide section 46 through the hollow section 44, and connected to a laser light source (not shown).

A reflection mirror 48 is provided in the recess 16. The reflection mirror 48 has a spherical reflection surface 50 and is formed rotationally symmetric with respect to the center line 1 of the concave portion 16. Therefore,
The light emitted from the light emitting section 40 is reflected by the reflecting surface 50 of the reflecting mirror 48.
In this case, the light is reflected toward the opening side of the concave portion 16, that is, toward the opening of the main body 10.

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 54 is concave
It has a disk shape concentric with 16 and the reflection surface of the reflection mirror 48
The light reflected by 50 is diffusely reflected and diffused in the diffusion plate 54.

In the lighting device configured as described above, the diffusion plate 54
If an object such as an electronic component is placed thereon, a silhouette of the object can be obtained. Laser light is emitted from the light emitting unit 40 through the optical fiber at various angles as shown in FIG.
The light is reflected by the reflecting surface 50 of the reflecting mirror 48 in a further expanded direction, is diffusely reflected in the diffusion plate 54, and is further diffused. Therefore, the entire diffuser 54 shines almost uniformly,
The object on the diffusion plate 54 is uniformly illuminated from the back side. Third
In the drawing, light is indicated by a plurality of straight arrows, but in reality, light is refracted complicatedly in the diffusion plate 54 and is emitted in random directions. An imaging device (not shown) is installed above the lighting device, and the silhouette of the target object is converted into an electric signal and subjected to image processing, whereby the outer shape of the target object is converted into electronic information.

If it is desired to change the light emitting area of the diffusion plate 54 or to make the illuminance of the desired area uniform, the three screws 32 may be loosened and the cover member 14 may be rotated. Cam surface
Because the relative position of the reflecting surface 50 with respect to the light emitting unit 40 changes due to the action of 36, the direction of light reflection on the reflecting surface 50 changes,
The illuminated area of the diffusion 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. The same members as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the embodiment of FIG. 4, a long hole 64 extending in parallel with the center line 1 is formed in the cylindrical portion 26 of the cover member 14 of the main body 60 instead of the slanted long hole 28. The member 14 is fixed to the bottom member 12. Therefore, if the cover 66 is moved in a direction parallel to the center line 1 by loosening the screw 66, the relative position of the reflection mirror 48 with respect to the light irradiation section 40 can be adjusted.

In the embodiment of FIG. 5, a bottom member 72 and a cover member 74 are provided.
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 a disk-shaped support plate 82 that supports the reflection mirror 48 is screwed. A male screw portion 84 corresponding to the female screw hole 80 is formed on the outer peripheral surface of the support plate 82, and a concave portion 86 is formed in the main body 76 by screwing the support plate 82 into the female screw hole 80. An adjustment knob 88 is fixed to the lower surface of the support plate 82. If the adjustment knob 88 is rotated, the support plate 82 moves up and down in the female screw hole 80 while rotating around the center line l, and the reflection Light emitting part 40 of mirror 48
The position with respect to changes.

In the embodiment of FIG. 6, the main body 90 is
And a cover member 94 are connected by four (only two shown in the figure) screws 96. screw
96 is screwed into a female screw hole 98 formed in the bottom member 92, and the position of the cover member 94 with respect to the bottom member 92 changes by rotating the screw 96 to adjust the amount of screwing into the female screw hole 98. It is supposed to. In addition, between the bottom member 92 and the cover member 94, four compression coil springs 100 are respectively disposed by being inserted through screws 96, and play of the screws 96 is eliminated.

Further, in the embodiment of FIG. 7, similarly to the embodiment of FIG. 5, the bottom member 104 and the cover member 106 are integrally fixed to form a main body 108. The disc-shaped support plate 14 that supports the reflection 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 l
A screw 118 is inserted upwardly coaxially with the support plate 114.
Is screwed into the female screw hole 122 formed. Therefore, when the screw 118 is rotated, the support plate 114 moves up and down in the concave portion 110, and the relative position of the reflection mirror 48 supported by the support plate member 114 with respect to the light emitting portion 40 changes. The support plate 114
The compression coil spring 12 is located between the
4 is provided to eliminate the play of the screw 118.

In the above embodiment, the relative position of the reflection mirror 48 with respect to the light emitting unit 40 is adjustable, but it is also possible to make these relative positions invariable, further simplifying the structure of the lighting device. be able to.

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

In addition, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a front view (partial cross section) of a lighting device according to 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. 4, 5, 6, and 7 are front views (partial cross-sections) showing a lighting device according to another embodiment of the present invention. 10: body, 16: recess 40: light emitting part, 48: reflection mirror 54: diffusion plate, 60, 76: body 86: recess, 90: body 91: recess, 108: body 110: recess

Claims (1)

(57) [Claims] 1. A main body including a concave portion having a circular cross-sectional shape, and a plurality of optical fibers that form a ring shape along an inner peripheral surface of the concave portion and emit light toward the center of the concave portion. A light emitting portion having: a convex reflecting mirror that is formed rotationally symmetrically with respect to a vertical line passing through the center of the concave portion, and reflects light emitted from the light emitting portion to the opening side of the concave portion; And a diffusion plate attached so as to cover the opening of the concave portion of the main body.