JPS6243003A - Irradiator - 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 condenser lens.

2. Prior Art A conventional irradiation device, as shown in Japanese Patent Publication No. 59-42404, has a configuration as shown in FIG. 4, for example.

In FIG. 4, light emitted forward from an incandescent light bulb 1 is condensed by a condensing lens 2 and irradiated onto a surface 3 to be illuminated.

In this case, the intensity of light on the irradiated surface 3 can be changed by changing the irradiation diameter depending on the distance between the lamp 1, which is an incandescent bulb, and the condensing lens 2. The intensity of the light on the reflected surface 3 is the strongest when the lamp 1 is on the focal point of the condensing lens 2.

At this time, the image of the filament of the lamp 1, which is an incandescent light bulb, is projected onto the irradiated surface 3 by the condensing lens 2. Therefore, less light escapes to areas other than the irradiated surface 3, and efficiency is improved. If it is a uniform brightness surface, the distribution of light on the irradiated surface 3 can also be made uniform.

However, the luminous efficiency of incandescent bulbs is generally very poor, and therefore, in recent years, discharge lamps with higher luminous efficiency are increasingly being used instead of incandescent bulbs. An example of this is one in which a plurality of arc tubes are arranged in a line as shown in FIG. In Fig. 5, 10 is an arc tube, 11.11'
12 is an electrode, 12 is a light emitting unit, and 13 is a discharge lamp composed of a plurality of arc tubes, each of which is electrically connected and arranged in parallel and close to each other on the same plane. . This lamp is placed in place of the incandescent light bulb 1 in FIG. 4 and used in the same manner.

Problems to be Solved by the Invention In such conventional irradiation devices, the arc tube may emit light only from the center in the radial direction. Even if they were lined up, the area near the tube wall was dark, and the distribution of light on the irradiated surface was therefore uneven.

Means for Solving the Problems The present invention solves these conventional problems by using a condenser lens and a plurality of arc tubes each having a light-transmitting tube wall arranged in parallel on the same plane. A lamp having one or more arc tubes in front of, behind, or before and after the arc tube row, and arranged so that the tube axes of the arc tubes do not overlap in the lens optical axis direction, The irradiation device is arranged between the arc tube closest to the lamp and the arc tube furthest from the lamp, and irradiates the irradiated surface with light from the lamp through the lens.

According to the above-described configuration, the present invention is arranged so that the tube axes of each arc tube do not overlap in the optical axis direction of the lens, even when the arc tube uses a light-transmitting lamp, so that the tube axes of the arc tubes are arranged so as to be closer to the lens. It is possible to realize a uniform brightness surface.

Embodiment FIG. 1 is a block diagram of an irradiation device in an embodiment of the present invention. In FIG. 1, 2o is a discharge lamp composed of an arc tube having a plurality of transparent tube walls, 21 is a condensing lens,
22 is an irradiated surface. Further, FIG. 2 is a configuration diagram of the lamp 20. In Figure 2, 30, 31, 32, 33
, 34.35 is an arc tube, 40, 41 . 42,43,4
4,46°40', 41', 42', 43', 44',
45' is an electrode. The arc tubes are electrically connected in series, and the two arc tubes 32 and 33 are placed parallel to each other on the same plane so that the distance between the walls of the arc tubes is smaller than the diameter of the arc tube. A condenser lens 21 is attached to the row of arc tubes arranged in parallel.
If the nearer direction is the forward direction, the arc tube 32.33
The arc tubes 30 and 31 are placed at the front, and the arc tubes 34 and 35 are placed at the rear. FIG. 3 is a configuration diagram when the lamp 2o is viewed from above.

In Fig. 3, 30, 31.32, 33, 34°36 are the arc tubes shown in Fig. 2, 60°51.52,
53, 54, and 55 are light emitting parts (arc columns). Further, the distance between the electrodes of each arc tube is equal. Moreover, each arc tube is arranged in parallel. Here, each arc tube is arranged so that each light emitting part (arc column) is in contact with the lamp 2o when viewed from the condensing lens 21.

In FIG. 1, the arc tubes 32 and 33 are connected to the condenser lens 21.
The image of the lamp 2o is projected onto the irradiated surface 12 by the focusing lens 21. The light emitting part of the lamp 20 is set to a size such that the light emitting part is just irradiated onto the irradiated surface 22 by the condensing lens 21. That is, the arc tube 30,
The distance between the electrodes at 31, 32 degrees, 33, 34, and 35 degrees, the thickness, the number of electrodes, and the arrangement are set according to the irradiated surface 22.

In this way, in the embodiment, the lamp 20
Since the arc tube is arranged so that the light emitting part is in contact with the light emitting part when looking at the light, even if only the center of the tube axis emits light in the tube radial direction, The luminous intensity near the wall can be compensated for by the arc tubes without waste, forming a uniform brightness surface for the condenser lens 21, and making the distribution of light on the irradiated surface 22 efficient and extremely uniform. Can be done.

Further, since the arc tubes 32 and 33, which are the center row of the lamp 10, are arranged on the focal plane of the condenser lens 21, the intensity of the light on the irradiated surface can be maximized. Furthermore, the size of the light emitting section can be easily made to correspond exactly to the irradiated surface 22. Therefore, all the light generated from the light emitting section and passed through the condenser lens 11 irradiates only the irradiated surface 22, which is efficient. Also, since light does not escape beyond the necessary range, there is no light pollution to other areas. In the example, six arc tubes were arranged in three rows so that the light emitting parts were in contact with each other when looking at the lamp 2o from the condenser lens 21. Arrange one or more arc tubes at the back or front and back of the row of arc tubes lined up, and draw a line parallel to the optical axis (.) from the tube axis of each arc tube to the condenser lens 21. If the lines are arranged so that they do not overlap, that is, the tube axes of the arc tubes do not overlap in the optical axis direction of the condensing lens 21, the same effect can be achieved even with two rows or other configurations. In addition, in the embodiment, the arc tubes are arranged so that the light emitting parts are in contact with each other when looking at the lamp 20 from the optical axis of the condenser lens 21, but it is not necessary that the light emitting parts are in contact with each other. If the tubes are overlapped at appropriate intervals, the distribution of light on the irradiated surface becomes more uniform.Also, if the light emitting parts are separated from each other, the irradiated surface can be irradiated almost uniformly. , the number of required lamps can be reduced and the energy consumption can be reduced.Also, in the example, the arc tubes were arranged close to each other so that the distance between the tube walls of the arc tube was smaller than the diameter of the arc tube. By doing so, the light emitting parts can be efficiently arranged close to the condensing lens 21, and the intensity of the light can be increased while keeping the distribution of light on the irradiated surface more uniform. 20 may be installed parallel to the condenser lens 21, and A- may be tilted.In this case, even if the arc tube does not have a uniform brightness distribution, the area of the arc tube relative to the condenser lens 21) can be Because it will be smaller
1 can be corrected, and the distribution of light on the irradiated surface 22 can be made uniform.

Unfortunately, the focal point of the condenser lens 21 is placed on the plane containing the arc tubes 32 and 33, but it is placed between the arc tubes 30 and 31 that are closest to the condenser lens 11 and the arc tubes 34 and 35 that are farthest from the condenser lens 11. Similarly, if the light intensity is lowered, the intensity of the light on the irradiated surface can be efficiently increased while ensuring the uniformity of the light on the irradiated surface. Furthermore, since one image of the lamp is somewhat blurred, the uniformity of the light on the illuminated surface can be improved. Furthermore, although the lamp 2o has each luminous tube electrically connected in series, they may be connected in parallel or in series and parallel as long as the lamp is lit. Note that when the arc tubes are connected in series, the current flowing through each arc tube becomes the same, and the amount of light generated can be made the same with a simple configuration. Further, when the lamp flashes/blinks, the timing and period of light emission can be made the same, and the irradiated surface can be irradiated uniformly in time. Further, in the lamp 2o, each arc tube may be supplied with energy from a separate power source. Further, there is no problem even if a nearby conductor or a trigger wire is wound around the arc tube. 1, the lamp 20 may be a discharge lamp such as a low pressure discharge lamp or an HID lamp, or may be a flash lamp such as a xenon flash lamp.

Furthermore, the lamp 20 does not need to emit visible light; it may also emit ultraviolet or infrared light. Also,
In this case, it goes without saying that a filter for blocking visible light may be provided between the condenser lens 21 and the lamp 20 in order to irradiate the irradiated surface 22 with infrared rays, for example. Further, a reflecting mirror may be installed behind the lamp 20 to reflect the light directed toward the rear toward the lamp and the condensing lens.

Effects of the Invention As described above, the irradiation device of the present invention has
Even when using a lamp that emits light only near the center of the tube axis, it is possible to obtain a uniform brightness surface of the required size according to the irradiated surface with a simple configuration, and the irradiated surface can be efficiently and uniformly irradiated.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a perspective view of a lamp used in an embodiment of Isshin's invention, Fig. 3 is a block diagram of a conventional irradiation device, and Fig. 4 is a conventional irradiation device. This shows the lamp used. 20... Lamp, 21... Condensing lens, 2
2...Irradiated surface, 30-35... Arc tube. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 - direction Figure 1? 3 \\, Figure 5 L. Procedural amendment (method) December 3, 1985

Claims (1)

[Claims] A condenser lens and a plurality of arc tubes each having a light-transmitting tube wall are arranged in parallel on the same plane, and one or more arc tubes are located before and after the arc tube row, and the tube axis of each arc tube is lamps arranged so as not to overlap in the lens optical axis direction, the focal point of the lens is arranged between the arc tube closest to the lens and the arc tube furthest from the lens, and the light from the lamp is irradiated through the lens. An irradiation device that irradiates a surface.