JPS58164251A - Cooling type photoelectric converter - Google Patents

Abstract

PURPOSE:To improve the cooling efficiency of a photoelectric converter by increasing the contacting area of a cooling head of a member connected to a refrigerator with the back surface of a cooling base in which a photoelectric converting element is disposed with a simple structure and guiding and disposing the cooling head coincident so that the center of the head coincides with the back surface of the base. CONSTITUTION:The tapered engaging recess 21 of a cooling base 5 is formed in the inner tube 3 of a heat insulating container, and the cooling rod 16 of a refrigeratio 14 is engaged under pressure through a spring connecting member 10 associated with a cooling head 22 having a tapered engaging projection. Thus, the contacting area of the head 22 with the base 5 is increased, and cooling efficiency is improved. Since the head 22 is always engaged at the prescribed position, no irregular cooling distribution occurs.

Description

[Detailed Description of the Invention] 4. Technical Field of the Invention The present invention relates to a cooling type photoelectric conversion device, and in particular, a photoelectric conversion device is cooled to a low temperature by being disposed in contact with a cooling base in a heat insulating bowl having a dual structure. This invention relates to improvements in the arrangement structure of refrigerators.

(To) Conventional technology and problems In the photoelectric conversion device using the photoelectric effect of semiconductors, I
Infrared detection devices used in the IIIK long wavelength infrared region have a property that they do not operate well unless the infrared detection element is cooled to a temperature much lower than room temperature. Therefore, such an infrared detection device generally uses a heat insulating device 1 of Dutsu structure consisting of an outer tube 2 and an inner tube 8 as shown in No. 1EK.
An infrared detecting element 6 is disposed on the vacuum side of the cooling base of the inner tube 8, which is provided in a part of the outer tube 2 and faces the nine-tone light source 4.

The signal output from the element 6 is taken out from an external lead terminal 9 of a ceramic terminal plate 8 shaped like a nine-annular disc, which is sealed by a lead wire 7 across a part of the outer tube wall. . 1*On the other hand, inside the inner tube 8, for example, on the back side of the cooling base 6 of the inner tube 8, there is a cooling head 11. A cooling rod 16 of a helium gas circulation type refrigerator 14 is inserted in a press-contact manner through a connecting member 10 consisting of a band-shaped heat transfer rod IB and a spring 18 using an O-ring 16, and the cooling rod 16 of the helium gas circulation type refrigerator 14 is inserted airtightly using an O-ring 16. A configuration is adopted in which the element 6 is efficiently cooled to a low temperature via a cooling base so that it can operate satisfactorily.

By the way, in the infrared sensing element having the above-mentioned configuration,
The connection structure between the cooling base 6 and the cooling rod 16 of the refrigerator 14 is press-connected via a connection member lO consisting of a cooling head 11 made of copper or the like having good thermal conductivity, a band-shaped heat conductor 18, and a spring 18. , heat exchange between the cooling base 6 and the cooling rod 16 is mainly performed through the band-shaped heat conductor 12. However, when the cooling rod 16 of the refrigerator 14 is pressure-connected to the back surface of the cooling base 6 via the connecting member 10, due to the elasticity of the band-shaped heat conductor 18 of the connecting member 10 and the spring 18, In this case, the position of the cooling head 11 that comes into contact with the back surface of the cooling base 5 does not coincide with the center of the cooling rod 16, resulting in a misalignment, and the cooling distribution with respect to the cooling base 6 is biased. There has been an inconvenience that the infrared sensing element 6 is difficult to cool down using a ladle or the like. In addition, the contact surface of the cooling head 11 that is brought into close contact with the back surface of the cooling base 6 is rounded and has a small surface area contributing to heat conduction or heat exchange, resulting in poor cooling efficiency.

(C) Purpose of the Invention The present invention has been made in order to eliminate the above-mentioned conventional disadvantages, and its purpose is to cool the back surface of the base on which the photoelectric conversion element is arranged and which requires cooling, and the connecting member connected to the refrigerator. The contact area with the head is increased by a simple structure, and the cooling head of the connecting member can be guided and arranged so that the center of the cooling head coincides with the center of the back surface of the cooling base, and the cooling efficiency is improved. The purpose is to provide a conversion device.

A) Structure of the Invention A cooling type photoelectric conversion device of the present invention that achieves the above object comprises an outer tube provided with a light-transmitting window and a photoelectric conversion element disposed opposite the light-transmitting window via a cooling base. The cooling rod of the refrigerator is inserted into a heat insulating container with a double pipe structure in which the space between the inner and outer pipes is evacuated, and the cooling rod of the refrigerator is in contact with the back surface of the cooling base. In the configuration, a tapered fitting recess is formed on the back surface of the cooling base, and the tip of the cooling rod is removably fitted and pressure-welded to the tapered fitting recess via a spring connecting member. It is characterized by:

(θ) Embodiments of the Invention Preferred embodiments of the invention will be described in detail below with reference to the drawings. - Figure 2 is a cross-sectional view of essential parts showing an embodiment of a cooled photoelectric conversion device for infrared detection to which the present invention is applied, and parts equivalent to those in Figure 1 are given the same reference numerals. .

In the figure, 1 indicates an outer tube 2 equipped with a transparent window 4 and the transparent window 4.
The infrared detection element 6 is disposed opposite to the cooling base 6 through the cooling base 6, and consists of a nine-inner tube 8, and the insulated container has a dewar structure in which both the inner and outer tubes 2.8 are kept in a vacuum. In the present invention, the shape of the back surface exposed in the inner tube 8 on the opposite side to the element mounting surface of the cooling base 6 on which the infrared detecting element 6 is arranged is formed into a tapered fitting recess 21 as shown in the figure. On the other hand, the shape of the cooling head 22 of the spring connecting member 10 interposed at the tip of the cooling rod 16 of the helium gas circulation type refrigerator 14 to be fitted and connected to the tapered fitting recess 81 of the cooling base 6 is also determined. A tapered fitting convex shape that fits into the tapered fitting recess 81 of the cooling base 6 is formed of steel or the like having good thermal conductivity. Therefore, the tapered fitting recess 2 of the cooling base 6 in the inner tube 8
1, a cooling head 28 having a tapered fitting convex shape, a heat conductor 13 formed by stacking a plurality of steel thin pieces in the form of a band, and a spring connecting member lO, which is a combination of a spring 18, is attached to the tip of the helium gas. The cooling rod 16 of the circulation type refrigerator 14 is inserted and pressed, and the refrigerator 14 is removably inserted into the heat insulating container 1 via an O-ring 15 with a screw 17 as shown in the figure.

Furthermore, the gap between the inner tube 8 and the cooling rod 16 is designed to prevent outside air from condensing or frosting inside the gap, and to prevent heat from flowing into the gap due to heat conduction of gas molecules. Then, it is evacuated to a vacuum through the exhaust pipe 18 and sealed. - As described above, the cooling head 82 having a Dever-like fitting convex shape is combined with the tapered fitting recess 21 of the cooling base 6 in the inner tube 8, and the refrigerator 14 is connected to the cooling head 82 through the spring connecting member IO. By adopting the insertion structure in which the cooling rod 16 is fitted and pressure-welded, the contact area between the cooling head 22 of the spring connecting member 10 connected to the cooling base 6 and the refrigerator 14 is increased, and the cooling efficiency is improved. Since the cooling head 22 of the spring connecting member 10 is always fitted to the cooling base 6 in a fixed position due to the above-mentioned tapered fitting configuration, the cooling distribution of the cooling base 5 becomes uneven as in the conventional case. This has the advantage of eliminating such inconveniences.

(0) Effects of the Invention As is clear from the above explanation, according to the structure of the cooled photoelectric conversion device according to the present invention, the cooling rod of the helium gas circulation refrigerator is installed on the cooling base inside the inner pipe of the heat insulating container. Since the structure is such that the device is inserted in a fixed position through a spring connecting member in a press-contact manner with a wide tapered contact area, the phototactic conversion element is placed on the cooling base and is evenly and efficiently It has the excellent advantage of being able to be cooled to low temperatures, and can be applied to various cooled photoelectric conversion devices such as infrared detection devices or infrared semiconductor laser devices that operate at low temperatures using helium gas circulation refrigerators. Extremely advantageous.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view illustrating the structure of a conventional cooling type photoelectric conversion device, and FIG. 1g is a vertical sectional view showing the structure of an embodiment of the cooling type photoelectric conversion device according to the present invention. In the figure, l is a heat insulating container, 2 is an outer tube, 8 is an inner tube, number is a transparent chamber, 6 is a cooling base, 6 is a photoelectric conversion element, 10 is a spring connecting member, Ig is a band-shaped thermal conductor, and 18 is a spring, 14
16 is a helium gas circulation refrigerator, 16 is a cooling rod, 15 is an O-ring, 17 is a screw, 18 is an exhaust pipe, 21 is a tapered fitting recess, and 22 is a cooling head. Figure 1 Figure 2

Claims (1)

[Claims] It consists of an outer tube provided with a light beam, and a round inner tube with a photoelectric conversion element placed in the light transmission path via a cooling base, and the space between both the inner and outer tubes is vacuumed. In a configuration in which the clean grommet of the refrigerator is inserted into a heat insulating spring having a tubular structure so as to come into contact with the back 11 of the cooling base, a tapered fitting recess is provided on the back of the cooling base. A cooling type photoelectric conversion device, characterized in that the tip of a clean grout is removably fitted and pressed into the tapered fitting recess via a spring connecting member.