JPS62131402A - Irradiation device - 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 the Invention The present invention relates to an irradiation device that irradiates light emitted from a light source onto an irradiated surface using a reflecting mirror and a condensing lens.

2. Description of the Related Art A conventional irradiation device has a configuration as shown in FIG. 5, for example. In FIG. They are arranged close to each other in parallel, and when triggered, all three light up at the same time. 12 is a condensing lens, and 13 is a rectangular prism reflector, which is a columnar reflector, and has three reflective surfaces with respect to the lamp 1o. A region 14 surrounded by a broken line is a required light emitting range, and the shape, arrangement, and size are set so as to exactly irradiate a rectangular irradiated surface through the condenser lens 12. Further, each arc tube of the lamp 10 is electrically connected in series and arranged close to each other in parallel, so that the axes of the condenser lens 12 and the arc tube 11 are parallel to each other, Images of a plurality of linear light emitting parts of the lamp 10 are projected onto the irradiated surface.

Further, the columnar reflecting mirror 13 is provided parallel to the axis of the arc tube 11 of the lamp 10.

FIG. 6 is a side view of the lamp 10. In FIG. 6, reference numeral 16 is a cross section of the arc of the arc tube 11, which is the part that actually emits light. 16 is a virtual image lamp formed by the columnar reflecting mirror 13 of the lamp 1Q, and corresponds to three reflecting surfaces.

Reference numeral 17 denotes an optical path range in which the condensing lens 12 just illuminates the surface to be illuminated. Here, the columnar reflector 13 is configured such that at least a part of the light rays that are emitted from the lamp 1o and reflected by the columnar reflector 13, that is, the light rays that are considered to have come out from the virtual image lamp 16, passes through the corresponding reflecting surface of the lamp 1o. The setting is made so that the light passes through and enters the optical path range 1.

With this configuration, the light beam reflected by the columnar reflector 13 passes between the arcs 15 of each arc tube 11, and the light beam on the irradiated surface in the direction perpendicular to the axis of the arc tube 11 is The distribution becomes more uniform than when irradiating with only the condenser lens 12 and lamp 10.

On the other hand, since the columnar reflector 13 is provided parallel to the axis of the arc tube 11 of the lamp 10, the distribution of the light reflected by the columnar reflector 13 in the direction of the arc tube axis is as follows. The distribution is similar to the brightness distribution in the direction. Therefore, the distribution of light on the illuminated surface in the direction horizontal to the axis of the arc tube 11 is:
The luminance distribution in the axial direction of the light emitting portion of the arc tube 11 is similar to that in the axial direction. As described above, the distribution of light on the irradiated surface can be made quite uniform both in the vertical direction and in the horizontal direction. Furthermore, the amount of light irradiated onto the irradiated surface via the condensing lens 12 can be increased by the columnar reflecting mirror 13, and the irradiation level on the irradiated surface can be increased, compared to when irradiation is performed using only the condensing lens 12 and the lamp 1o.

Problems to be Solved by the Invention In such a conventional irradiation device, among the reflected light beams, the columnar reflecting mirror 13 passes through the lamp 1o and is divided into an optical path range 17.
By using the incident light, the brightness level on the irradiated surface can be improved compared to when irradiating with only the condensing lens 12 and the lamp 1o, and the brightness distribution on the irradiated surface can be made uniform. However, only the light emitting part 15 actually emits light, and when images of multiple linear light emitting parts of the lamp 1o are projected onto the irradiated surface, the brightness level between the light emitting parts is not sufficient and the brightness distribution There was a problem that it was not sufficiently uniform. In addition, if an attempt was made to improve these problems, the reflecting mirror 5 would have to be large in size or complicated in shape, making it difficult to manufacture. This problem is solved by a lamp in which a condensing lens, a plurality of arc tubes with transparent tube walls are arranged in parallel, and a lamp provided in a part other than the optical path that passes through the lens and corresponds to the irradiated surface. and a reflecting mirror having a reflecting part that reflects light from the lamp to the lamp in addition to a reflecting part having a component that directly reflects the light from the lamp into the optical path, and the light emitting part of the lamp is This is an irradiation device arranged so as to project onto the irradiated surface through a condensing lens.

Effect of the Invention With the above-described configuration, the present invention makes the distribution of light in the lamp axis direction uniform as is the brightness distribution of the lamp, and the distribution of light in the direction perpendicular to the lamp axis is reflected by a reflecting mirror and by a plurality of light-transmitting tubes. The wall refraction can be made more uniform and can further increase the overall light level.

Embodiment FIG. 1 is a block diagram of an irradiation device in a first embodiment of the present invention. In Fig. 1, 1 is a xenon flash lamp, 2 is an arc tube, and 6 of them are arranged close to each other in parallel, and when triggered! lle books emit light at the same time. 3 is a condensing lens, 4 is a filter, and 5 is a hexagonal prism reflecting mirror, which has five reflecting surfaces with respect to the lamp 1. An area 6 surrounded by a broken line is the required light emitting range, which includes the linear light emitting part of the arc tube 2, and is set in shape, arrangement, and size so that the rectangular irradiated surface is just illuminated through the condenser lens 3. It is. In addition, the arc tube of lamp 1 is
They are electrically connected in series and are arranged close to each other in parallel, so that the lens surface of the condenser lens 3 and the axis of the arc tube 2 are parallel to each other, and the lamp is placed on the irradiated surface. The required light emitting range including the images of the plurality of linear light emitting parts of 1 is projected with some focus. Still, the hexagonal prism reflector 6 is provided parallel to the axis of the arc tube 2 of the lamp 1.

FIG. 2 is a side view of the lamp 1. In Fig. 2, 7 is the cross section of the arc of the arc tube 2 and the part that actually emits light, 8 is the clear bulb that is the transparent wall of the arc tube 2, and 9
is the corresponding optical path range of the light beam that passes through the condensing lens 3 and enters the irradiated surface from the required light emission range 6, and 5 is the same 6 as in Fig. 1.
It is a prismatic reflecting mirror (consisting of five plane reflecting parts a, b, c, d, and e), and is provided in a part other than the optical path range 9 corresponding to the irradiated surface passing through the condensing lens 3. It is. FIG. 3 is a diagram showing the state of refraction of parallel rays incident on the clear bulb 8. In the first embodiment, most of the light emitted from the light emitting section 7 in directions other than the condenser lens 3 enters the hexagonal prism reflection boundary 5. Among them, the light incident on the reflecting parts S, c, and d is reflected by the columnar reflecting mirror 1 shown in the conventional example.
3, it is reflected via the lamp 1 or directly into the optical path range 9 and illuminates the surface to be illuminated. At this time, part of the light incident on the clear bulb 8 of the lamp 1 is refracted by the clear bulb 8 as shown in FIG.
6. The reflecting parts a and θ are installed so as to reflect the refracted light from the clear bulb 8 and the light from the light emitting part γ to the arc tube array of the xenon flash lamp 1, and are directly reflected into the optical path 9 and reflected into the light path 9. It is not intended to irradiate the irradiated surface.

Due to the presence of the reflecting parts a and θ, the light that is directly or indirectly incident on the reflecting parts 2L and 6 out of the light generated from the light emitting part A is reflected in the direction where the xenon flash lamp 1 is present, and the clear bulb 8. The light incident on the clear bulb 8 is refracted in a complicated manner by a plurality of clear bulbs 8 in a refractive pattern as shown in FIG.
Then, it proceeds in the direction of the hexagonal column reflecting mirror 6. Among them, the refracted light (for example, a ray of light) traveling in the direction of the condensing lens 3 illuminates the surface to be illuminated. On the other hand, among the refracted lights traveling in the direction of the octagonal prism reflection boundary 5, the light incident on the reflection parts S, c, and d (for example, the light ray B
) is from the light emitting part γ to the reflecting parts b and c.

Like the light traveling to d, it is reflected in the direction of the condenser lens and illuminates the illuminated surface. In addition, the refracted light incident on the reflection parts a and e is reflected again in the direction of the arc tube array of the xenon flash lamp 1 directly or via another reflection mirror, and is reflected in the direction of the condenser lens 3 and the hexagonal prism reflection mirror as before. 5, and irradiates the irradiated surface. As described above, in the first embodiment, in addition to the reflecting parts s, c, and d that directly reflect light within the optical path range 9, the simple structure is that a reflecting part ``e'' that reflects light to the lamp 1 is provided. It is possible to improve the utilization rate of the light emitted from the lamp 1 and improve the brightness level on the irradiated surface. Furthermore, the light refracted by the clear bulb 8 is irradiated onto the irradiated surface, and the clear bulb 8 acts as if it were also a light emitting section, so the illuminance level on the irradiated surface between the light emitting sections 7 is reduced. The reduction can be compensated for, and the brightness distribution on the irradiated surface can be made much more uniform than when irradiated with a conventional irradiation device.

The table below shows the experimental results in the first example.

In the experiment, a 2 m x j6171 rectangular irradiated surface 20 m in front was irradiated with a xenon lamp using a Fresnel lens with a focal length of about 340 to 370 mm and a required emission range of 40 mm x 32 mm.

As described above, it is clear that both the irradiation level on the irradiated surface and its uniformity are significantly improved.

Next, a second embodiment will be described. FIG. 4 shows a side view of the lamp 1 according to the second embodiment. In Figure 4, 5
is a reflection that blocks light in the vicinity of the optical path range 9 that is irradiated in a direction other than the optical path range 9 on the hexagonal prism reflector 6 of the first embodiment, and also reflects that light in the direction where the xenon flash lamp 1 is present. This is an octagonal prism reflecting mirror provided with sections f and g, and the other configuration is the same as in the first embodiment. Due to the presence of the reflecting parts f and g, out of the light generated from the light emitting part 7, some of the light directly and indirectly incident on the reflecting part f2g is reflected in the direction where the xenon flash lamp 1 is present, and enters the clear bulb 8. do. As in the first embodiment, the light incident on the clear bulb 8 is refracted in a complicated manner by the plurality of clear bulbs 8 in a refracted state as shown in FIG. Reflection part b of the refracted light traveling in the direction of the octagonal prism reflector 5
, c.

The light incident on d is reflected in the direction of the condenser lens in the same way as the light traveling from the light emitting section 7 to the reflecting sections b, c, and d, and illuminates the surface to be illuminated. In addition, the refracted light incident on the reflection section 6 is reflected again in the direction of the arc tube array of the xenon flash lamp 1 either directly or via another reflecting mirror, and is reflected in the direction of the condenser lens 3 as in the first embodiment. The light is refracted in the direction of the octagonal prism reflecting mirror 5' and irradiates the irradiated surface. In addition, the refracted light incident on the reflecting portion f1g is reflected again in the direction of the arc tube row of the xenon flash lamp 1 either directly or via another reflecting mirror, and as described above, the refracted light is
The light is refracted in the direction of the prismatic reflecting mirror 6' and illuminates the irradiated surface.

As described above, in the second embodiment, the utilization rate of light generated from the lamp 1 is improved compared to that in the first embodiment with a simple configuration in which the hexagonal prism reflector 5 of the first embodiment is provided with a reflection part fpg. The luminance level on the irradiated surface can be further improved by improving the brightness, and the luminance distribution on the irradiated surface of the vehicle seat can be made more uniform than when irradiated with the irradiation device of the first embodiment. In addition, in the second embodiment, the lamp 1 or the reflecting mirror 5
The octagonal prism reflecting mirror 5' including the reflecting parts f and g allows the light traveling from the lamp 1 or the part of the reflecting mirror 5' other than the optical path range 9 toward the condensing lens 3 to be reflected by the octagonal prism reflecting mirror 5' including the reflecting parts f and g.
The structure is designed to block light in the immediate vicinity of the lamp.

Therefore, the configuration of the light-shielding reservoir can be made very compact, and since the light can be shielded right next to the light-emitting part of the lamp 1, it is possible to shield light outside the required light-emitting range θ (for example, at the end of the reflective part It is possible to efficiently block most of the optical path that enters the condenser lens. Therefore,
This is particularly effective in applications where it is desired to reduce the level of leakage light as much as possible on the irradiated surface other than the irradiated surface.

In addition, 1. In the second embodiment, since the light spreads in the horizontal direction, the closer the hexagonal prism reflector 5 and the octagonal prism reflector 5 are to the lamp 1, the more the irradiation level on the irradiated surface can be increased, and the distribution can be improved. . In addition, if the hexagonal prism reflector 6 and the octagonal prism reflector 6 are appropriately sized, shaped, and arranged, the lamp 1
The size of the irradiated surface can be increased while keeping the light distribution uniform. Although a hexagonal columnar reflector was used in the first embodiment and an octagonal columnar reflector was used in the second embodiment, similar effects can be obtained with other polygonal columnar reflectors, and cylinders and quadratic curved surfaces can also be used. The same applies to pillar reflectors. Also,
Although the lamp 1 is installed parallel to the condensing lens 3, it may be inclined to some extent. In addition, the lamp 1 was placed near the focal point of the condenser lens 3 to create a somewhat blurred projected image of the lamp 1 on the irradiated surface to achieve the best irradiation level and distribution. The image of the lamp may be blurred. In the lamp 1, the light emitting tubes 2 are electrically connected in series, but they may be connected in parallel or in series and parallel as long as the lamps are lit at the same time. Further, the lamp 1 may be a single arc tube bent as long as it has a plurality of linear light emitting parts. Further, there is no problem even if a nearby conductor or a trigger wire is wound around the arc tube. In addition, lamp 1 does not have to be a xenon flash lamp, but can also be a fluorescent lamp or HID lamp.
It may be a discharge lamp such as a lamp, other flash lamps, or an incandescent lamp that emits linear light. Further, the lamp 1 does not need to emit visible light, but rather emit ultraviolet or infrared light.

But that's fine. Further, the filter may be one that blocks visible light, for example, in order to irradiate the irradiated surface with infrared rays, and it goes without saying that other filters may or may not be included. Moreover, although the reflecting mirror is columnar, it may be of other shapes such as a spherical shape.

Effects of the Invention As described above, the irradiation device of the present invention can efficiently and uniformly irradiate an irradiated surface of a necessary size with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the first embodiment of the present invention, FIG. 2 is a side view of the same embodiment, FIG. 3 is a diagram showing the state of refraction of parallel rays incident on the clear bulb 8, and FIG. FIG. 5 is a side view of the second embodiment of the present invention, FIG. 5 is a configuration diagram of a conventional irradiation device, and FIG. 6 is a side view of the same conventional example. 1...Xenon flash lamp, 2...
...Earth tube, 3...Condensing lens, 6...
·Reflector. Name of agent: Patent attorney Toshio Nakao and 1 other person2-
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Claims (2)

[Claims] (1) A lamp in which a condensing lens and a plurality of arc tubes each having a light-transmitting tube wall are arranged in parallel; a reflecting mirror having a reflecting part that reflects light from the lamp to the lamp in addition to a reflecting part having a component that directly reflects the light of the lamp into the optical path; an irradiation device arranged so as to project light onto the irradiation surface; (2) Irradiation according to claim 1, comprising a reflecting mirror provided so as to block at least part of the light in the vicinity of the optical path that passes through the condenser lens and corresponds to the irradiated surface in the direction of the condenser lens. Device.