JPS5948703A - Device for cooling optical transmission parts - Google Patents

Abstract

PURPOSE:To allow optical transmission parts to exhibit optical performance sufficiently by installing a heat exchanger which cools cooling liquid in an atmosphere wherein a container is installed and circulating the cooling liquid between the container and heat exchanger. CONSTITUTION:The heat exchanger 24 which cools the cooling liquid 26 such as pure water and ethylene glycol with the ambient air around the container is installed in the atmosphere wherein the container 10 is installed, and a pump 28 which circulates the cooling liquid 26 between the container 10 and heat exchanger 24 is provided. Further, a fan 30 is provided to cool the cooling liquid 26 which flows in the heat exchanger 24, and this fan 30 blows the ambinet air around the container 10 to the heat exchanger 24 to cool the cooling liquid 26 with the ambient air. Thus, the optical transmission parts, e.g. a reflection mirror 16 is cooled.

Description

[Detailed Description of the Invention] A cooling fluid is applied to a container in which a product is held! This invention relates to the production and cooling of optical transmission components directly or indirectly.

Directly or indirectly cools the light transmission parts by circulating cooling fluid (Ii'J) in a container holding light transmission parts such as a transmitting plate, condensing lens, or reflecting mirror that is illuminated by strong light such as a laser beam. The equipment is well known and these optical transmission parts are kept at the appropriate temperature.
Performance was maintained by maintaining the

Conventionally, as a cooling device for this second, for example, the device shown in Fig. 1 '. was used. In the figure, the container 10 has a jacket 12, and this jacket 12 has an O-ring 1.
A reflecting mirror 16 is fixed via a mirror 4. A lid 18 is fixed to the outer periphery of the jacket 12 with screws, and a spacer 20 is interposed between the outer periphery of the reflecting mirror 16 and the inner periphery of the rosette 18. The laser beam irradiated in the direction of arrow A passes through the opening formed in the lid 18,
It is reflected in the direction of arrow B by the reflecting cast 16.

At this time, part of the incident energy of the laser beam is absorbed by the reflecting mirror 16, but when the carbon dioxide laser beam with a wavelength of 10.6 Cμm is reflected by the copper reflecting mirror 16, the absorption rate of the laser beam is is approximately 1 [chi].

Therefore, the reflection@"f.16 generates heat due to absorption of laser light, and its optical performance deteriorates. Therefore, the reflecting mirror 16 is cooled by a cooling device as described below. Namely, the jacket 12, the A cooling fluid 22 is supplied in the direction of arrow C into the space formed by the ring 14 and the reflector 16, and is discharged in the direction of the arrow. Extraction, cooling?tI
It will be cooled by the r body.

However, in conventional cooling devices, the cooling fluid 2
1. Cooled with tap water or a chilling unit as 2. "; Since the conventional system uses water, it has the disadvantage that sufficient optical performance cannot be achieved. In other words, in the conventional device, a cooling fluid 22 whose temperature is lower than the ambient temperature of the reflector 16 is used. As a result, the surface temperature of the reflector 16 becomes lower than the ambient temperature, and water vapor condenses on the surface of the reflector 16, resulting in a decrease in reflectance, adhesion of dust, etc. There was a drawback that the reflecting mirror 16 was burnt out due to an increase in the partial light absorption rate on the surface of the reflecting mirror 16.

The present invention has been made in view of the above-mentioned problems, and its purpose is to maintain the temperature of the optical transmission component at an appropriate temperature below the ambient temperature at all times. It is an object of the present invention to provide a cooling device #5 for optical transmission components that can fully exhibit optical performance.

In order to achieve the above object, the present invention provides a cooling device for an optical transmission part, W4, which directly or indirectly cools the optical transmission part by burying a cooling fluid in a container holding the transmission part. The container has a heat exchanger that cools the cooling fluid in the atmosphere of the container, and the cooling fluid is circulated between the container and the outside of the heat exchanger, and the cooling fluid is cooled in the atmosphere of the container. It is a sexual characteristic that the optical transmission parts are cooled by the cooling flow 5 bodies.

Preferred embodiments of the present invention will be explained below based on the drawings.

2A shows a preferred embodiment of a cooling tower for four optical transmission parts according to the present invention, and in the figure, parts of the conventional device L1 and In+ shown in FIG. 1 are given the same reference numerals and explained. Omitted.

As shown in the figure, a heat exchanger 24 is installed in the atmosphere in which the container 10 is installed in order to cool the cooling fluid 26 with the surrounding air of the container 10, and a heat exchanger 24 is installed between the container 10 and the heat exchanger 24. Cooling fluid 26? ) & % Pump 28 is lowered by one crotch. As the cooling fluid 26, it is possible to use, for example, a pure liquid such as pure water, high quality water or ethylene glycol. A fan 30 is provided to cool the cooling fluid 26 passing through the heat exchanger 24, and the fan 30 blows the air surrounding the container 10 toward the heat exchanger 24, thereby blowing the air inside the heat exchanger 24. The cooling fluid 26&'li passing through is cooled by this ambient air.

As described above, a characteristic feature of the present invention is that the container 10 is installed in a restricted atmosphere and has a heat exchanger 24 that cools the body 26 with the atmosphere of the container 10. , cooling l71f between the container 10 and the heat exchanger 24.

The cooling fluid 26 cooled by the atmosphere of the container 10 cools the light transmission components such as the reflector 16 by circulating the body 26.

The non-inventive embodiment has the above configuration, and its operation will be explained below.

The cooling fluid 26 supplied to the container 10 by the pump 28 is
It contacts the reflecting mirror 16 to remove heat, is discharged from the container 10, and circulates between the container 10 and the heat exchanger 24. At this time, the cooling fluid 26 that has collected heat from the reflector 16 is cooled by the surrounding air of the container 10 blown by the fan 30 as it passes through the heat exchanger 24 . As mentioned above, the atmospheric heat exchanger 24 is installed in the atmosphere in which the container 10 is installed (the ambient temperature of the reflector 16 and the heat exchanger 2
Since the temperature of the air blown onto the reflector 4 is the same, the temperature of the cooling fluid 26 cannot always be maintained at an appropriate temperature higher than the ambient temperature of the reflector 16. Therefore, the surface temperature of the reflector 16 is maintained at an appropriate temperature that is much higher than the ambient temperature of the reflector 16, so that water vapor does not condense on the surface of the reflector 16, resulting in a decrease in reflectance and a gray level. It is possible to prevent the danger of dust and burnout of the reflecting mirror.

In addition, in the embodiment described above, the case where the reflecting mirror 16 is used as the optical transmission component was explained, but when other optical transmission components such as a condenser lens, a transmission plate, a partial reflection mirror, etc. *V, or a plurality of them are cooled. Even so, 1j1-like effects can be obtained by changing the structure of the container 10.

can be blown.

Further, in the above-described embodiment, the case where the reflective mirror 16 is cooled by bringing the cooling fluid 26 into direct contact with the reflective mirror 16 has been described. The same effect can be obtained by forming the mirror with a uniform moon phase of the rostral degree and cooling the reflecting mirror 16 indirectly.

As explained above, according to the present invention, the container is installed and has a heat exchanger that is installed in the atmosphere and cools the cooling fluid in the atmosphere of the container. The temperature of the optical transmission parts is always maintained at an appropriate temperature higher than the surrounding temperature by shielding the j 1, 1 (-) and cooling the optical transmission parts with the cooling fluid cooled in the atmosphere of the container. By causing water vapor to form on the surface of the optical transmission component, the optical performance of the optical transmission component can be fully exhibited.

In addition, according to the present invention, there is no need to provide a special temperature control mechanism (C mechanism or chilling unit), and the heat exchanger can be installed in the atmosphere where the container is installed, so the device is inexpensive and the operating cost is low. It also has the advantage of being inexpensive.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a conventional cooling device for optical transmission components, and FIG. 2 is a schematic diagram showing a preferred embodiment of a cooling device 6 for optical transmission components according to the present invention. Identical parts in each figure are given the same reference numerals, 10 is a container, 16 is a container, and 16 is a container.
24 is a heat exchanger, 26 is a cooling fluid, and 30 is a fan. Agent: Patent attorney Shin Kuzuno - (1 other person)

Claims (1)

[Claims] (1) In a cooling device for optical transmission components that cools the optical transmission components directly or indirectly by circulating a cooling fluid through a container holding the optical transmission components, the device is installed in the atmosphere in which the container is installed and is cooled in the atmosphere of the container. An optical transmission component having a heat exchanger for cooling a fluid, circulating the cooling fluid between the container and the heat exchanger, and cooling the optical transmission component with the cooling fluid cooled in the atmosphere of the container. cooling system.