JPS6182837A - Light irradiation apparatus - Google Patents

Abstract

PURPOSE:To interrupt effectively heat rays without diminishing the output of ultraviolet rays and to eliminate the heat deterioration of a filter by blowing gas on the outside surface of a heat rays interrupting filter opposed to a discharge lamp and thereby cooling forcedly the filter. CONSTITUTION:Heat rays and visible light are interrupted via a heat rays interrupting filter 3 by passing the light irradiated from a discharge lamp 2 through the filter 3 and only ultraviolet rays are irradiated forward to irradiate the material to be irradiated and the material is dried. Air is blown on the filter 3 from a nozzle 5l constituting one part of a means cooling forcedly the filter 3 cool forcedly the filter 3. Therefore even if the film thickness is not made thick, namely the irradiated amount of heat rays irradiated forward can be diminished without bringing with the diminution of irradiation output of ultraviolet rays.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a light irradiation device used for drying paint and the like.

[Conventional technology]

A light irradiation device such as an ultraviolet irradiation device uses a filter to cut off heat rays from a discharge lamp and allows ultraviolet rays to pass through, and is described in, for example, Japanese Utility Model Application No. 53-17169.

[Problems that the present invention attempts to solve]

However, in such a light irradiation device, if the thickness of the filter is increased in order to sufficiently absorb and cut the irradiation heat, there is a problem in that the output of -ultraviolet rays decreases. Additionally, there was a problem of an increase in the temperature of the irradiated object due to the secondary radiant heat of the filter plain wood.

[Means to solve the problem]

The present invention was made in view of the above circumstances, and effectively blocks heat rays without reducing ultraviolet output. Moreover, it is an object of the present invention to provide a light irradiation device that does not have the problem of temperature increase of the object to be irradiated due to secondary radiation of the filter, and also does not have the problem of thermal deterioration of the filter.

The present invention is characterized in that a cooling part means is provided for forcibly cooling the filter by blowing gas to the outside of the heat ray cutoff filter, which is disposed opposite to the discharge lamp housed in the two main bodies.

[Effect]

Since the heat ray blocking filter is forcibly cooled by two ventilation flows, the heat ray blocking filter can be
You can perform the disconnection using the valid number.

〔Example] An embodiment of the X invention will be described with reference to the drawings.

(1) is a main body, and this main body houses a discharge lamp (2) inside. (3) is a heat ray cleavage filter, and a discharge lamp (
2). (4) has a nozzle (51), and to describe the present embodiment in more detail, the air nozzle (51) has two bodies (11
has openings (6) and (7) on the front and back sides, a holding part (8) divided into two parts at the center, and an arcuate reflecting plate (9) disposed on each holding part (81). ).A heat ray blocking filter (3) is disposed at the open end of this reflecting plate (9).

Two pipes (10) each having a nozzle (5) constituting a part of the forced cooling means are arranged opposite to each other at both ends of the filter (3).
) are disposed, and the pipes are engaged with protrusions (11) that protrude from each end of the holding part (8) facing each other, and are provided along the entire length of the filter (3) at an angle of 6°. Further, the outside is covered with an outer casing (12), and a duct (13) is connected to the top plate of the second outer casing (12). Duct (1
3) is the pump (14) Vc connection, which is common. The pipe (10) is connected to the pump (14) via a connecting pipe (17).
) is formed to draw in part of the exhaust air discharged from the
ing. Of course, a separate air blowing pump may be provided and a pipe (lO) may be connected to this for cooling.

By using a reflective plate (9+), a guichroic mirror that reflects ultraviolet rays and transmits visible light and heat rays.

Is it possible to remove heat rays from the reflected light of the heat ray blocking filter (2 with a discharge lamp reaching 31&C)? It's good to go.

Of course, two ordinary reflecting plates may also be used. A dichroic filter that reflects visible light and heat rays and transmits ultraviolet rays was used as the heat ray blocking filter (3).

'Next, the operation of the above embodiment will be explained. Discharge lamp (2)
is connected to a lighting device 1C (not shown) and turned on.

When the light from the discharge lamp (21) passes through the heat ray blocking filter (3), heat rays and visible light rays are blocked through the filter (3), and only ultraviolet rays are irradiated forward, and an object to be irradiated (not shown) is irradiated. and let it dry.

Air is blown onto the heat ray cutoff filter (3) from a nozzle (5) constituting a part of a means for forcibly cooling the heat ray cutoff filter (3), thereby forcibly cooling the filter (3). Therefore, the amount of heat rays irradiated forward can be reduced without increasing the thickness of the filter (3), that is, without reducing the ultraviolet irradiation output. Shigamo.

The secondary radiant heat of the filter (31 itself) is also removed by adsorption of gas to the outer surface of the filter (3), and furthermore, thermal deterioration of the filter (3) can be prevented.

Note that the filter (3) only reflects heat rays.

Visible light and ultraviolet light may be transmitted. If it is something that does not transmit heat rays, it is not 2-reflection.

It may also be absorption. Further, by providing ventilation holes (15) and (16) in the side plate and top plate of the holding part (81), a ventilation flow in the direction of the arrow may be generated to cool the first reflective plate (9). Also, the reflector plate (91) may not be provided and only the direct light from the discharge lamp (2) may be used.

Similar effects can be obtained even when the present invention is applied to an irradiation device for general lighting.

As described in detail above, the present invention includes a heat ray cutoff filter provided opposite to the discharge lamp enclosed in the X-body, and a cooling means for forcibly cooling the filter by blowing gas onto the outer surface of the filter. This not only improves the heat ray blocking performance without reducing the amount of UV irradiation, but also reduces the secondary radiant heat of the filter.

Not only does it prevent overheating of the irradiated object, but it also prevents the filter from deteriorating due to heat.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a partially cutaway perspective view, and FIG. 2 is a side sectional view of the main part. (1)・・・・・・Main body (2)・・・・・・・
・Discharge lamp (3)...Heat ray cutoff filter (4)
)... Cooling means license applicant Toshiba Electric Materials Co., Ltd. Agent Benzoji Ono 1) Yoshi Kou 1982 Patent M No. 204381 2゜ Name of invention Light irradiation device 3, Amendment person case Relationship with Patent applicant: 1-4-28 (375) Mita, Minato-ku, Tokyo; Representative: Tsutomu Tsuruo 4; Representative: 1-201-1 Funakoshi-cho, Yokosukai City, Kanagawa Prefecture, 237 Toshiba Electric Materials Corporation Yokosuka Plant 6,? 11 positive contents

Claims (1)

[Scope of Claims] A main body; A discharge lamp housed in the main body; A heat ray cutting filter installed opposite to the discharge lamp; Forced cooling of the filter by blowing gas onto the outer surface of the filter. An irradiation device characterized by comprising: a cooling means for;