JPS6379018A - Photoelectric converter - Google Patents

Abstract

PURPOSE:To reduce a required cooling time, by putting a package for placing detection elements on a cylinder body direct contact with a heat contact section through a heat insulating section. CONSTITUTION:A circulation cooler is made up of a body section 10 and a cold finger 9 and the tip thereof acts as a cold generating section. The cooler is normally used below -200 deg.C depending on the type of a detector. A detector dewar is made up of an optical window 1, outer and inner cylinder sections 4 and 5, a flange section 13, a heat insulating section 15, a valve 14 and the like. A detection element 2 is mounted on a package 3 and then to the inner cylinder 5 through the insulating section 15. In this manner, when light transmitted through the optical window 1 mounted on the outer cylinder 4 is detected so as to be converted to electricity with the element 2, a package 3 for placing the element 2 is brought into direct contact with a heat contact section 8 to perform a heat insulation for the inner cylinder section 5 and the package 3 without any cleaning bottom thereby enabling a reduction in heat load and in heat capacity.

Description

[Detailed Description of the Invention] [Summary] The present invention provides a device for detecting light and photoelectrically converting it, in which a package on which a detection element is mounted is brought into direct contact with a thermal contact portion, and is connected to a cylindrical body through a thermal insulation portion. By mounting this, it is possible to realize efficient cooling and a photoelectric conversion device with a simple configuration.

[Industrial application field]

The present invention relates to a cooling device for a detector, laser, etc. used at low temperatures, and particularly to a dewar structure when cooling is performed using a circulating cooler.

[Conventional technology]

The 21st detector cooling system using a conventional circulating cooler
1! ! Shown in I. The circulation cooler main body 10 consists of a compressor and a motor, and the cold part is located at the tip of the cold finger 9. The detection element 2 is located inside the dewar, and the thermal contact part 8
cooled through. The duplexer has an optical window l, an outer cylinder part 4. Inner cylinder part 5. It consists of a flange portion 13°, a cooling bottom 122, etc., and is vacuum insulated to reduce the heat load flowing in from the outside. The detection element 2 is placed on a cooling bottom machine via a package 3. The lead wire 6 is used for driving the detection element and reading signals.

[Problem that the invention seeks to solve]

However, with the configuration shown in FIG. 2, there is no problem when the detection element is small, but as the detection element becomes larger, the package also becomes larger, the heat capacity increases, and the time required for cooling becomes longer.

Furthermore, as the detection element becomes larger, the cooling bottom also becomes larger and its heat capacity increases.

This will be explained in more detail using FIG.

FIG. 3 shows the main parts of the conventional embodiment, and the reference numbers in this figure are the same as those in FIG. 2.

In the conventional configuration, the thermal contact 8 contacts the package 3 via the cooling bottom 12 . Therefore, contact thermal resistance occurs at two locations A and B in the figure.

Furthermore, when the cooling bottom is made larger, the heat capacity increases and the time required for cooling becomes longer.

[Means for resolving the gap]

In the present invention, efficient cooling and a simple configuration are achieved by bringing the package in which the detection element is placed into direct contact with the thermal contact portion and placing it on the cylindrical body via the thermal insulation portion.

[Effect]

That is, by eliminating the cooling bottom and insulating the inner cylinder and package, it is possible to significantly reduce the heat load and heat capacity.

〔Example〕

In the prior art, vacuum insulation between the outer cylindrical part 4 and the inner cylindrical part 5 was essential in order to reduce the heat load.

To achieve this, the outer cylinder part 4. Inner cylinder part 5. The dewar, which is composed of the cooling bottom part, the flange part B, the optical window 1, etc., must have a vacuum-tight structure. However, when used in a vacuum atmosphere such as outer space, and even on the ground, it is often possible to use a vacuum exhaust system, and in such environments (or under conditions of use)
In this case, the need for vacuum secrecy as described above is eliminated. The present invention has focused on this point and has a structure in which the cooling bottom is eliminated and the package 3 is brought into direct contact with the thermal contact portion 8, thereby making it possible to reduce the heat capacity.

Embodiments of the present invention will be described below with reference to FIG.

The circulation cooler is functionally divided into a main body 10 and a cold finger 9. Among these, the main body 10 is composed of a motor, a compressor, and the like. cold figure 9
consists of a displacer, a regenerator, etc., and the tip is the cold generation part. Although it depends on the type of detector (or laser), it is usually used at -200°C or lower.

The detector unit has an optical window 1. Outer cylinder part 4. Inner cylinder part 5, flange part 13. Thermal insulation part 15. Valve 14. It is composed of terminals 7, etc. The detection element 2 (or laser element) is mounted on the package 3 and attached to the inner cylinder part 5 via the thermal insulation part 15.

The package is made of alumina or the like, and since it is in direct contact with the heat welding part 8, it has the following advantages.

(1) Reduced contact thermal resistance (using a cooling bottom as in the prior art would double the contact area, which was a drawback).

(As shown in Figure 2113, the temperature drop between A-8 of the cooling bottom no longer occurs.

(3) Reduced by the heat capacity of the cooling bottom.

Moreover, by attaching the package to the inner cylinder part via the thermal insulation part 15, it becomes possible to reduce the conductive heat load.

Also, when using in a non-vacuum atmosphere, please
The inside of the dewar can be evacuated to 10' Torr or less with Rev. 14. When used in a vacuum atmosphere such as outer space, it can be left open. Note that the inner cylinder, thermal insulation part, and package part are confidential. For example, the inner cylinder part does not need to be an inner cylinder.If such a structure is adopted, the inner cylinder part 5 does not need vacuum tightness, so the degree of freedom in material and shape is greatly increased. do.

Further, by attaching the package to the inner cylinder part through the thermal insulation part, the conductive heat load can be reduced.

〔Effect of the invention〕

According to the present invention, the cooling bottom is removed by providing the cooling bottom function to the package, and for this reason, (11) the contact function is reduced, (2) there is no temperature drop in the cooling bottom, and (3) the cooling bottom is This has the effect of reducing heat capacity and conduction heat load.

As a result, the time required for cooling can be shortened.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and FIGS. 2 and 3 show conventional examples. l...Optical window, 2...Detection element, 3...Package. 4...Outer cylinder part, 5...Inner cylinder part, 6...Lead wire,
7... Terminal, 8... Thermal contact part, 9... Cold finger, 10... Circulation cooler main body, 13...
Flange part, 14... Valve, 15... Heat insulation part. Patent applicant: Director of the Agency of Industrial Science and Technology Kozo Iizuka Non-inventive example No. 1 Figure Conventional issue 4 No. 21X! 5 Conventional 4-row t° leaf Fig. 3

Claims (1)

[Claims] A detection element (2) that detects light to photoelectrically convert the light transmitted through the optical window (1) attached to the outer cylinder part (4), and the detection element (2) is mounted thereon. a package (3) that supports the package (3), an inner cylinder part (5) that supports the package (3), and a thermal contact part (8).
), the package (3) is brought into direct contact with the thermal contact part (8), and the inner cylinder part (5) is provided with a thermal insulation part ( 15) A photoelectric conversion device characterized by having a configuration in which the photoelectric conversion device is mounted through the device.