JPS63318002A - Lighting apraratus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Field of application of the invention]

The present invention relates to the reproduction of original drawings in drafting and animation,
The present invention relates to an illumination device suitably used for observing and displaying negative or positive images in X-ray photographs, color photographs, etc.

[Conventional technology and its problems]

Today, for the purpose of copying original drawings in drawings and animations, and observing and displaying negative or positive images in X-ray photographs or color photographs, there are devices in which fluorescent or incandescent lamps are placed on the underside or inside of a glass plate or opal glass plate. Widely used. However, since these devices are naturally thick, they are often inconvenient to install and use. In addition, increasing the number of light sources in order to average the illuminance increases the amount of heat generated, which worsens the working environment during the high summer temperatures. In addition, as an application of edge-light ink, which has become popular recently, as shown in Fig. 9, transparent resin plates 2', 2', whose end faces 2'a are inclined at an angle of about 45 degrees, are made by shifting the position of the end faces. An illumination means has also been devised in which the end faces are not perpendicular and the light ray R is incident from the end face 2'b side, but the more the number of laminated boards 2' increases in order to equalize the illumination intensity, the more the number of laminated boards 2' increases. Overall thickness increases.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a lighting device that is thin and can provide average illuminance even when using a small number of light sources by using edge lighting.

[Means to achieve the purpose]

In order to achieve the above object, the lighting device according to the present invention has a light source arranged at the edge of a transparent plate material having a large number of pores parallel to each other along the length and/or width direction. It is characterized in that a light beam is made incident from the light source in a direction intersecting the pores. That is, the present invention essentially utilizes edge writing, but its characteristic structure is that the interior of the transparent plate has a large number of pores running along the surface direction thereof. Here, polymethyl methacrylate or polystyrene with excellent transparency is suitable as a material for the plate material, but the former also serves as a cast molding and allows easy formation of pores, so the upper limb for the purpose of the invention is also preferred. Although the shape and size of the board material are arbitrary, it is usually square (square or rectangular) that matches the size of the target base paper or film. The pores are arranged substantially along the plane of the plate (i.e. across the interior of the plate from one end face to the opposite end face of the plate) and preferably parallel to each other. The number of pores and the spacing between each pore are arbitrary, but in order to average the illuminance, it is preferable that the pores be as many as possible and arranged at equal intervals. In addition, in order to average the illuminance as much as possible, each pore should not be arranged on the same plane along the surface direction of the plate, but should be arranged so that, for example, the height gradually increases along the thickness direction (distance from the reference plate surface). It is appropriate to arrange them in a staggered manner (for example, along a plane oblique to the surface direction of the plate material) or in a staggered manner. Note that the inner wall of the pore should be as smooth as possible in order to increase reflection efficiency. Similar to conventional edge lighting, the light source is arranged along the end face of the plate material so that the light rays from it are incident from the end face of the plate material and are as perpendicular to the internal pores as possible. Therefore, assuming that the plate is rectangular and a linear light source such as a fluorescent lamp is used, the light source is arranged along the end surface of the plate parallel to the running direction of the pores. In exceptional cases, it is also possible to arrange annular fluorescent lamps around a circular plate, but in this case it is difficult to make the pores orthogonal to all incident rays. As is well known, edge lighting utilizes the phenomenon of total internal reflection between media with different optical densities, but since the incident light rays are not always parallel to the plate surface, some light rays leak toward the plate surface. It is inevitable that you will. Furthermore, even if the light is parallel, depending on the angle at which it collides with the pores, it will also be reflected toward the lower surface of the plate. Of these leaked light rays, the portion that leaks to the front side serves as a part of the illumination light source, or the light ray that leaks or is reflected to the back side is wasted for no purpose. Therefore, by directly plating the back side of the plate material to make it a mirror surface, or by placing a mirror opposite to the back side of the plate material, the leakage light beams, etc. are re-reflected to the front side, and the illumination efficiency is significantly improved. The light source is preferably a fluorescent lamp, ie, a hot cathode fluorescent lamp (ordinary fluorescent lamp) or a cold cathode fluorescent lamp, with the latter cold cathode type being particularly suitable for the purpose. This is because, in addition to being able to reduce the diameter to 6 mm or less, the light source temperature does not rise because it does not have a filament inside. However, since the lamp cannot be lit with ordinary 100μ AC, a DC high-voltage power source similar to that used for neon tubes must be prepared. Incidentally, in order to collimate the irradiated light beam from the light source as much as possible, incidental equipment such as a parabolic reflector and a condenser are added as necessary. There is no need to perform any special processing on the upper surface of the plate material. However, if the surface is provided with a thin light-scattering layer such as an opal sheet or film, ground glass or a translucent coating layer, the illumination can be evened out even further.

[Effect]

Figure 1 (top view) and Figure 2 (first view) showing the principle of the present invention.
, a sectional view taken along the line II), the main parts of the lighting device 1 include a transparent plate 2, a mirror 3 that covers the lower surface (back surface) of the plate, both end surfaces 2a of the plate 2, A pair of fluorescent discharge lamps 4, 4 installed opposite to each other at 2a, a pair of concave reflectors 5, 5 installed on the back side of the discharge lamps, and a pair of concave reflectors 5, 5 installed inside the plate 2 from the ends toward the center. It consists of a large number of pores 6, 6, etc., which are provided so as to gradually increase in height. The actions and effects of the light source beam in this device can be roughly divided as follows. ■ Among the rays R from light source 4, rays R parallel to the plate surface
1 collides with the pore 6, and a portion of H1+ is reflected toward the surface 2b of 2, but a portion of R1'' is reflected toward the back surface 2c of 2, and is then re-reflected by the mirror 3 to reach the surface 2b of 2. ■ On the other hand, among the rays R from the light source 4, the ray R2 that is not parallel to the plate surface undergoes total internal reflection repeatedly within the light source 2 if its optical axis is greater than the critical angle R2'. While reaching the other end surface of 2, it collides with the pores 6, 6, etc., and receives the same reflection effect as in (2) above, or is transmitted directly to the surface 2b.Also, the optical axis is smaller than the critical angle. The incident light ray R2'' directly passes through the back surface 2C of the plate material 2, but is immediately reflected by the mirror 3,
This also transmits to the surface 2b side of 2 following the same process as described in (2) above. Above, for the convenience of explanation, the light rays R are classified into four types, but overall, most of the incident light rays enter the pore 6 and the mirror 3.
Since the light is reflected by the light and transmitted to the surface side of the plate material 2, a large illuminance is obtained as a whole, and since each pore 6 actually functions as a linear light source, the result is a very average illuminance. A lighting effect is obtained and, moreover, the whole is extremely thin. In addition, when a light scattering layer such as an emulsion plastic plate, a suri, or an opal glass plate is present on the surface 2b of 2, the illuminance is further averaged.

【Example】

Hereinafter, some examples of embodiments of the invention will be explained with reference to Examples, but the examples are of course for illustrative purposes and are not meant to limit the idea of the invention. FIG. 3 is a front view of the X-ray film observation apparatus according to the present invention, and FIG. 4 is a sectional view taken along line 1--2 in FIG. 3. The entire device 1^ includes a transparent plate 2 made of polymethyl methacrylate fixed within a horizontally long rectangular frame 8, a mirror 3 that covers the back surface 2c of the plate, and upper and lower end surfaces 2a, 2a of the plate 2.
A pair of cold cathode fluorescent discharge lamps 4.4 installed opposite to each other, a pair of concave reflectors 5.5 installed on the back side of the discharge lamps, and an opal sheet 7 stuck to the surface 2b of the plate material 2. , an external power supply device 9, and a clip 10 attached to the upper part of the frame 8, and inside the plate 2, there are a large number of thin through holes parallel to each other (however, they are arranged in a staggered manner). 6.6... is formed. When the discharge lamp 4 is energized, the above

[Operation] Total reflection occurs according to the mechanism explained in the section above, and the entire surface 2b of the plate material 2 emits bright light, so a negative X-ray photograph N is placed on the surface using a clip 10 and observed. Since the device 1^ of this example is thin with an overall thickness of about 1 cm, it allows for effective use of a small examination room. Fig. 5 is a plan view showing an example in which the invention is applied to a tracing device, and Fig. 6 is a sectional view taken along the line ■-■ in the previous figure. The apparatus IB of this example is almost the same as the previous example, but unlike the previous example, the pores 6 and 6' are arranged at different heights along the vertical and horizontal directions of the rectangular transparent plate 2. , said 2
The difference is that the entire end surface of is covered with the discharge lamp 4. The device IB of this example has light sources on all sides, so it is brighter than the previous device, and since it is thinner, it can be placed on an ordinary desk and used conveniently for tracing original drawings. Embodiment 3 FIG. 7 is a plan view showing an example in which the invention is applied to viewing a positive color film, and FIG. 8 is a sectional view taken along line -10-IV-IV in the previous figure. The device 1c of this example is different from those of the previous two examples, and is configured using a commercially available annular fluorescent discharge lamp (well-known by trade names such as "Circline") 4 as a light source, and the entire device has upper and lower parts that also serve as pedestals. An annular casing 11 that can be divided into two parts, a circular transparent plate 2 that is integrally fixed to the lower half 11b of the casing, and an emulsion plastic that is integrally fixed to the upper half 11a of the casing. It is composed of a plate 7. In the above, the pores 6, 6' are arranged in the shape of a grid inside the plate material 2, and the casing 11 is made to have a parabolic cross-sectional shape, and the mirror 7 is attached to the lower surface. There is. When the power is turned on through the socket 12, the plastic plate 7 on the top shines brightly, allowing you to view the positive film placed on top. Although various examples in which the invention is used as a relatively small lighting device have been described above, similar effects can be obtained even when the invention is used in a larger photo display, a signboard, or the like.

【Effect of the invention】

As explained above, the present invention utilizes edge lighting to produce copies of original drawings, X-ray photographs, color photographs, etc. for drafting and animation, which are thin and can provide average illuminance even when using a small number of light sources. By being able to provide an illumination device suitable for observing and displaying negative or positive images in a computer, it is possible to contribute to the consumer's life.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view illustrating the principle of the inventive device;
2 is a sectional view taken along the line II in FIG. 1, FIG. 3 is a front view of the X-ray film observation device according to the present invention, and FIG.
The figures are Fig. 3, a sectional view taken along the line ■-■, Fig. 5 a plan view showing an example in which the invention is applied to a tracing device, and Fig. 6 similarly taken along the line III-I in the previous figure. 7 is a plan view showing an example in which the invention is applied to positive color film viewing; FIG. 8 is a sectional view taken along line IV-IV in the front view; FIG. 9 is a known illumination It is a model diagram of an example of a device. The meanings of the main symbols in the diagram are as follows: Knee 1, IA~1c
:The entire lighting device of the present invention;・2:1. IA~1c (same below) transparent plate material (exaggerated thickness in each figure), 3: Mirror, 4
: Light source, 5: Concave reflecting mirror, 7: Light scattering layer (diffusing plate), 8
: Mounting frame for plate material (2), 9: External power supply; -・2a:
2 (7) end surface, 2b: 2 (7) front surface, 2C: 247) back surface; ... 6,6": pore in 2; - 10: IA clip, 11: 1c casing,
・2'a: 2' inclined end surface; Patent applicant Nissen Chemical Industry Co., Ltd. Figure 9 1 Case description Patent application 2 filed on June 19, 1985, name of invention Lighting device 3, amended Relationship with the patent case Patent applicant address: 3-7-17 Nitta-cho, Niihama, Ehime Prefecture
Name: Nissen Chemical Industry Co., Ltd. Representative - Satoru Miya (1 other person) 4, Agent address: 1-32-12 Higashi-Mikuni, Yodoyo-ku, Osaka City Voluntarily) 6. Number of inventions increased by amendment 07. Target of amendment (1) Drawing 8, details of amendment (1) Drawings 2, 3, and 4 will be corrected as shown in the attached sheet.

Claims (1)

[Claims] 1. By arranging a light source at the edge of a transparent plate material having a large number of pores parallel to each other along the length and/or width direction, it is possible to A lighting device characterized in that a ray of light is incident toward the direction. 2. The device according to claim 1, wherein each pore is arranged so that the height (distance from the reference plate surface) gradually varies from one side of the plate to the other side. 3. The device according to claim 1 or 2, wherein the back surface of the plate material is covered with a mirror. 4. The device according to any one of claims 1 to 3, wherein the surface of the plate material is covered with a thin light scattering layer. 5. The device according to claim 1, wherein the light source is a fluorescent lamp.