JPH0483530A - Light irradiator - Google Patents

Abstract

PURPOSE:To reduce the temp. difference between the bottom part and upper part of a pipe body and to suppress the blackening of the pipe wall of a lamp by providing a cooling plate, a pipe body sucking prevent piece and a large number of air flow control pieces to the pipe body of the lamp from the vicinity of the upper part thereof to the suction port thereof. CONSTITUTION:A rod-shape lamp 1 and the trough-shape mirror 2 covering the lamp 1 are provided and a lamp cooling air blow port 6 is arranged to the top part of the mirror 2. Further, the clean plate 7 constituting a wind tunnel positioned from the vicinity of the upper part of the pipe body of the lamp 1 to the suction port 6 thereof is provided. Further, at least one pipe body sucking preventing piece 3 is vertically provided to the pipe body from the upper vicinity of the pipe body toward the suction port 6 of the mirror 2. A large number of the air stream control pieces 10 vertically provided to the pipe body from the upper vicinity thereof to the suction port 6 of the mirror 2 are arranged at a predetermined interval along the longitudinal direction of the lamp 1 so as to set the temp. of the pipe body to predetermined temp. As a result, the non-vaporization of a light emitting material or the blackening of the pipe wall of the lamp can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a light irradiator having a structure covered with a rod-shaped lamp such as a high-pressure mercury lamp or a gutter-shaped mirror having an elliptical cross section, for example.

[Prior Art] Conventionally, when a light irradiator is used for curing UV-curable resin, for example, a rod-shaped high-pressure mercury lamp or metal halide lamp, which emits UV rays well, is used as the lamp in the light irradiator. .

FIG. 5 is a diagram showing a schematic configuration of a conventional light irradiator, in which (a) is a front view and (b) is a side sectional view in the longitudinal direction of the lamp.

In FIG. 5, a lamp 1 housed in a casing 4 of a light irradiator is covered with a gutter-shaped mirror 2 with an elliptical cross section in order to increase the efficiency of light utilization. The lamp 1 normally requires cooling, and is cooled by cooling air flowing in from the opening 9 at the bottom of the casing 4. Most of the cooling air flowing in from the opening 9 at the bottom of the casing 4 flows to the bottom 1a of the lamp l, and the other part flows to the inner surface of the gutter-shaped mirror 2, and the other part flows to the inlet 6 of the lamp cooling air. The air passes through the cooling blade door, passes through the notch in the mounting plate 5, and is sucked and exhausted from the exhaust port 8 by a blower (not shown).

In the above-mentioned exhaust air cooling of such a device, since the shape of the lamp 1 is elongated, the exhaust air is sucked upward from the tube body of the lamp l and approaches the cooling air inlet 6, resulting in insufficient cooling air volume. . For that purpose, Jikkō 1-1226
As disclosed in No. 6, a tube suction prevention piece 3 made of quartz is provided on the mounting plate 5 to prevent the lamp l from being suctioned upward.

[Problems to be Solved by the Invention] In the conventional device as described above, especially when the lamp has a high output and the diameter of the tube is large, most of the cooling air is initially directed to the bottom 1a of the tube of the lamp l. After hitting the tube, it either slides down the side of the tube and flows to the top, or because of this, the bottom 1 of the tube
The temperature difference between a and the upper part 1b tends to increase.

In particular, lamps such as metal halide lamps in which a metal halide is encapsulated as a luminescent material are controlled at the coldest point in order to maintain a good vaporization state of the luminescent material.

That is, the temperature at the bottom 1a of the tube, which is the coldest point, is controlled so that it does not fall below a predetermined temperature (for example, about 500° C.) and cause insufficient vaporization of the luminescent material.

However, if the cooling air volume is suppressed by controlling the coldest point as described above, if the temperature difference between the bottom part 1a and the top part 1b of the tube is large, the top part 1b will become quite hot (for example, 80°C).
0°C or higher), and depending on the composition of the luminescent material, the lamp tube wall may become black. Therefore, it is necessary to control the temperature of the upper part 1b of the tube to prevent it from turning black. For this purpose, the air volume from the cooling blower must be increased.

However, increasing the air volume with a blower not only requires a large amount of equipment, but also requires strong cooling from the floor.
It will be cooled down to below 500℃. This causes non-vaporization (defective evaporation) of the luminescent material, resulting in poor luminescence and a decrease in illuminance.

The present invention has been made to solve this problem, and by reducing the temperature difference between the bottom and top of the tube body, it is possible to prevent unvaporization of the luminescent material and blackening of the tube wall of the lamp. At a predetermined temperature (e.g. 800°C to 50°C)
The purpose of the present invention is to provide a light irradiator that can maintain the temperature within the range of 0°C.

[Means for Solving the Problems] In order to achieve the above object, a light irradiator of the present invention includes a rod-shaped lamp and a gutter-shaped mirror that covers the rod-shaped lamp, and the gutter-shaped mirror There is an inlet for lamp cooling air at the top of the lamp, and a cooling plate that forms the wind tunnel is located from near the top of the lamp tube to the inlet, and from near the top of the tube toward the mirror inlet. At least one tube suction prevention piece is installed upright, and the piece is placed at a predetermined distance along the longitudinal direction of the lamp so that the temperature of the tube reaches a predetermined temperature. It has a large number of air flow control pieces erected over the suction port of the mirror.

[Function] According to the structure of the present invention, the temperatures at the bottom and top of the tube are within a predetermined temperature range, so blackening does not occur, and poor light emission does not occur, and the tube It has a long lifespan.

[Embodiment] FIG. 1 is a side sectional view showing a schematic configuration of an embodiment of the light irradiator of the present invention, and FIG. 2 is an enlarged explanatory view of the main part of FIG. 1. Further, in FIGS. 1 and 2, the same reference numerals as those in FIG. 7 indicate the same or equivalent functions, so the explanation will be omitted.

1 and 2, lO is a wind flow control piece, and this wind flow control piece lO and the L-shaped plate 11. The tube suction prevention piece 3 and the L-shaped plate 12 are both fixed with bolts 16 and nuts 17. The wind flow control piece 10 is inserted between each tube body suction prevention piece 3 through an L-shaped plate 11 with screws 13 at equal intervals.
It is screwed and fixed to a portion of the upper surface of the mounting plate 5 having a mounting cross-sectional width W2.

On the other hand, the pipe suction prevention piece 3 is fixed to one piece of the L-shaped plate 12 by a bolt 14 and a nut 15 at a portion of the lower surface of the mounting plate 5 having a mounting cross-sectional width W. At this time, the lower end of the tube suction prevention piece 3 extends below the lower end of the wind flow control piece 10 (closer to the tube 1). Therefore, when the tube 1 is sucked up during cooling, the tube 1 does not come into contact with the wind flow control piece 10, but only with the tube wicking prevention piece 3. That is, the distances d1 and d2 between the tube wall of the lamp 1, the tube suction prevention piece 3, and the air flow control piece lO are in the relationship of d1 = 0.8 to 1.2 mm, and d2 = 3 to 4 mm, respectively. This prevents the tube body of the lamp l from being drawn up and bent by the cooling air.

In this way, since the pipe body does not come into contact with the wind flow control piece lO, it is fixed weaker than the suction piece 3.

It should be noted that it is possible to fix the airflow control piece lO in the same way as the tube suction prevention piece 3. Since W, > W2, there is a risk of insufficient airflow (if W t =W 2, (The total area of the air outlet, which is the notch in the mounting plate 5, becomes smaller). In addition, the wind flow control piece 10 does not have to be made of quartz, but may be made of other insulating material (
For example, alumina), etc. may be used.

FIG. 3 is a partial diagram for explaining the air flow in the light irradiator shown in FIG.
Figure 4 shows the wind flow control piece 10 viewed from a direction perpendicular to the longitudinal direction of the tube, and Figure 4 shows the temperature distribution in each part of the tube. It is a figure showing a state.

The lamp cooling mechanism in this embodiment will be described below with reference to FIGS. 1 to 4.

The cooling air flowing in from the opening 9 at the bottom of the casing 4 flows along the left and right side surfaces of the tube, and then collides with the lower portions of the six pieces 10 and 3, scattering, and becoming a turbulent flow.

As a result, the area directly below the six pieces 10 and 3 at the top of the tube is locally cooled, increasing the cooling effect. In this state, as shown in FIG. 4, there is a slight temperature difference between the part directly below the six pieces 10 and 3 and the area directly below it, or the temperature is generally 800°C.
It can be seen that the temperature is kept below (the temperature that does not cause blackening on the tube wall).

Further, the caps at both ends of the lamp 1 shown in FIG. 1 are fixed by fixtures not shown. At this point, the lamp l is sucked up by the cooling air and curved into an arcuate shape, or inside the base, as described in Japanese Utility Model Publication No. 57-17713, an elastic body such as a sponge is inserted into the lamp l. Since the tube of the lamp l is connected, there is no risk of the tube breaking due to the above-mentioned curvature.Furthermore, in terms of airflow control, the tube suction prevention piece 3 and the airflow control piece 10 have the same effect.

In the above-mentioned embodiment, the interval between the tube suction prevention piece 3 and the air flow control piece lO is 40 mm apart from each other, but it is 50 mm apart from each other.
They do not necessarily have to be spaced at equal intervals as long as they are spaced at a pitch of m mm or less6.And since the blackening of the lamp l tends to progress from both ends of the tube body, the installation of the wind flow control pieces 10 is not necessary. An effective cooling effect, that is, an effect of preventing blackening, can also be obtained by making the spacing coarse in the center and dense at both ends.

[Effects of the Invention] As explained above, according to the present invention, the temperature difference between the bottom and the top of the tube body is reduced, eliminating lamp lighting failures,
It is possible to maintain the temperature within a stable temperature range that can prevent blackening of the tube wall.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a schematic configuration of an embodiment of the light irradiator of the present invention, FIG. 2 is an enlarged explanatory view of the main parts of FIG. 1,
FIG. 3 is a partial diagram for explaining the air flow in the light irradiator shown in FIG. 1, and FIG. b) is a view of the wind flow control piece viewed from a direction perpendicular to the longitudinal direction of the tube, Figure 4 is a diagram showing the temperature distribution state of each part of the tube, and Figure 5 is a conventional light irradiator. The figure (A) is a front view, and the figure (B) is a side sectional view in the longitudinal direction of the lamp. In the figure. l2 pump 2: Mirror 3: Pipe suction prevention piece 4: Housing 5: Mounting plate 6: Suction port A: Cooling plate 8/Exhaust port 9: Opening 10: Wind flow control piece 11° 12: L-shaped plate 13゜14゜16: Bolt 15゜17: Nut

Claims (1)

[Claims] The lamp includes a rod-shaped lamp and a gutter-shaped mirror that covers the rod-shaped lamp, and a lamp cooling air inlet is provided at the top of the gutter-shaped mirror. A cooling plate forming a wind tunnel located from near the top of the body to the suction port; at least one pipe wicking prevention piece standing upright from near the top of the pipe body toward the suction port of the mirror; It has a large number of air flow control pieces arranged at a predetermined distance along the length of the lamp and erected from near the top of the pipe body to the suction port of the mirror so that the temperature reaches a predetermined temperature. A light irradiator featuring: