JPS6248399B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooled photoelectric conversion device, and more particularly to an improvement in a cooled photoelectric conversion device that uses a refrigerator to cool a photoelectric conversion element.

Photoelectric conversion elements such as semiconductor laser elements and infrared detection elements are generally used after being cooled to a predetermined operating temperature. The photoelectric conversion elements can be cooled by using a coolant such as liquid nitrogen or by using a circulating refrigerator. This circulation type refrigerator is extremely convenient because it can achieve extremely low temperatures just by supplying electricity without replenishing refrigerant, and can operate continuously for about 10,000 hours. However, on the other hand, the cooling head tends to vibrate. However, in the conventional method in which a heat radiation stand on which a laser element is mounted as a photoelectric conversion element is used in close contact with the cooling head of a refrigerator, the laser element vibrates as the cooling head vibrates, resulting in the laser beam being emitted. This caused problems when the optical axis of the lens was misaligned. Further, there were also problems in that minute temperature fluctuations occurred due to the compression and expansion of helium gas, etc. inside the refrigerator, which caused wavelength fluctuations in the laser light.

The present invention has been made in view of the above-mentioned points, and its purpose is to provide a cooled photoelectric conversion device having a structure that prevents vibrations and minute temperature fluctuations of the photoelectric conversion element. In a cooled photoelectric conversion device in which a mounted heat dissipation stand is provided on a cooling head of a refrigerator, the cooling head and the heat dissipation stand are connected via a cushion plate member made of a flexible thermal conductor. In addition, the heat radiation stand is fixed to a fixed object different from the refrigerator.

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

The figure is a cross-sectional side view of a main part showing the structure of one example of a cooled photoelectric conversion device according to the present invention. Reference numeral 1 denotes a refrigerator main body, and a cooling head 2 is provided connected to the refrigerator main body. Also, the heat sink 3 on the cooling head 2
For example, a laser element 4 is mounted as a photoelectric conversion element and housed in a vacuum container 5 . A transparent window 6 is provided in the vacuum container 5. In this configuration, the refrigerator 1 is operated and the cooling head 2 cools the heat sink 3 and the laser element 4 to a predetermined operating temperature. Accompanying heat sink 3
In order to prevent vibrations, in the present invention, the cooling head 2 and the heat sink 3 are connected via a cushion plate member 7 made of a flexible heat conductor. This cushion plate member 7 is made of a metal plate with good thermal conductivity such as copper or aluminum, or a plate made of copper wire or the like. The heat dissipation table 3 is fixed to an optical bench, for example, without external vibration, by passing a bellows-shaped part 5a formed in the vacuum container 5 and using a support rod 8 made of a material with poor thermal conductivity, such as epoxy resin. It is fixed to object 9.

Therefore, the cushion plate member 7 can sufficiently cool the heat sink 3 without significantly impairing the thermal resistance between the cooling head 2 and the heat sink 3, and also has the role of absorbing vibrations of the cooling head 2. fulfill. Furthermore, since the cushion plate member 7 has a slightly higher thermal resistance than a metal block, it also has the function of suppressing minute temperature fluctuations in the cooling head 2 from being transmitted to the heat radiating table 3.

In this way, by connecting the cooling head 2 of the refrigerator and the heat radiation stand 3 through the cushion plate member 7 and fixing the heat radiation stand 3 to the fixed object 9, vibrations and minute temperature fluctuations of the cooling head 2 are prevented from being radiated. It is possible to prevent this from being transmitted to the table 3, and as a result, it is possible to prevent vibrations and minute temperature fluctuations of the laser element 4.

Although the above-mentioned embodiment describes a case where a laser element is used as a photoelectric conversion element, the application is not limited to this, but is applicable to a cooled photoelectric conversion device using other photoelectric conversion elements such as an infrared detection element that requires cooling. You can also.

As is clear from the above description, in short, the present invention connects a heat radiation stand on which a photoelectric conversion element is mounted and a cooling head of a refrigerator via a cushion plate member made of a flexible thermal conductor. The heat dissipation table is fixed to a fixed object that does not vibrate, and can easily prevent vibrations and minute temperature fluctuations of the cooling head from being transmitted to the photoelectric conversion element. This is extremely useful in practice, as it eliminates the obstacles that occur during this process.

[Brief explanation of the drawing]

The figure is a sectional side view of a main part for explaining the structure of a cooled photoelectric conversion device according to the present invention. 1: Freezer body, 2: Cooling head, 3: Heat sink, 4: Photoelectric conversion element (semiconductor laser element),
7: Plate member for cushion, 9: Fixed object.

Claims (1)

[Claims] 1. In a cooling type photoelectric conversion device in which a heat radiation stand on which a photoelectric conversion element is mounted is provided on a cooling head of a refrigerator, the cooling head and the heat radiation stand are connected to a cushion plate member made of a flexible thermal conductor. A cooling type photoelectric conversion device characterized in that the heat radiation stand is connected to a fixed object different from the refrigerator.