JPH0451491Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Technical field to which the idea belongs]

This invention relates to an assembly structure of a minute signal detector and a cooler, which is intended for a minute signal detection device configured to cool an electric minute signal detection element such as an infrared sensor with a cooler.

[Prior art and its problems]

In the above-mentioned detection devices that detect minute signals such as infrared sensors or laser receivers, the detection element is heated to an extreme temperature of, for example, liquid nitrogen temperature (approximately -200℃) in order to remove thermal noise and improve detection performance. Needs to be cooled to low temperatures. For this purpose, a device is known which combines an infrared detection element and a cooler as shown in FIG. 3 for the above-mentioned infrared detection device. That is, in FIG. 3, 1 is an infrared detection element, and 2 is a cooler, for example, a reverse Stirling cycle type, for cooling the detection element.
The detection element 1 is cooled to an extremely low temperature by the cold heat generated in step 2. For this purpose, the detection element 1 is embedded and fixed in advance in the top of an inner cylinder 31 of a thin-walled glass insulating container 3 with a low thermal conductivity, which has a dual structure inside and outside.
A cooling plate 5 was thermally connected to the 2 side via a flexible heat transfer member 4 made of laminated copper thin plates with good thermal conductivity, and the container 3 was connected to the flange 23 of the cooler 2. In this state, the cooling plate 5 is brought into contact with the bottom surface of the detection element 1 to form a heat transfer connection between the two, whereby the detection element 1 is cooled by the cold heat generated in the cold station 22 of the cooler 2. Further, a spring member 6 is interposed between the cold station 22 and the cooling plate 5 for pressing the cooling plate against the detection element 1 to apply a pressing force. On the other hand, the heat insulating container 3 is equipped with a see-through detection window 33 at the top of the outer cylinder 32 facing the detection element 1, and maintains a vacuum between the inner cylinder 31 and the outer cylinder 32 so that the external This prevents heat from entering. Furthermore, when attaching the inner cylinder 31 to the flange 23 of the cooler 2,
The internal space 35 of the inner cylinder 31 is evacuated through the vacuum port 34 to prevent heat from entering from outside. Note that 1a is a lead wire drawn out from the detection element 1, and 8 is an installation base for the cooler 2.
With this configuration, it is possible to cool the detection element 1 to a cryogenic temperature with the cold heat generated in the cold station 22 by operating the cooler 2 while suppressing heat intrusion from the outside into the cryogenic part. However, the small signal detection device having the above configuration has the following problems. That is, since the heat insulating container 3 equipped with the detection element 1 is installed directly coupled to the flange 23 of the cooler 2, vibrations generated by the rotation of the drive motor 24 of the cooler 2 are directly transmitted from the flange 23 to the heat insulating container 3. It propagates to the detection element 1 via the container 3. For this reason, a phenomenon similar to so-called camera shake occurs in the signal detection element 1, and the output signal includes noise, and when this detection signal is image-processed, the above-mentioned noise affects it, making it difficult to obtain clear image quality. It disappears.

[Purpose of invention]

This idea was developed in consideration of the above points, and while maintaining the function of preventing heat intrusion from the outside,
It is an object of the present invention to provide an assembly structure of a minute signal detection device configured so that vibrations generated from a cooler are not directly propagated to a detection element.

[Key points of the idea]

In order to achieve the above object, this invention installs a heat insulating container equipped with a cooler and a detection element each independently on an installation base, and
The remaining space between the inner cylinder of the heat insulating container and the expansion cylinder on the cooler side is filled with a heat insulating material.

[Example of idea]

1 and 2 each show a different embodiment of this invention, and in each figure, the same members corresponding to those in FIG. 3 are given the same reference numerals. First, in the embodiment shown in FIG. 1, according to this invention, the cooler 2 is installed and supported on the installation base 8 via the anti-vibration rubber 25 in a vibration-proof manner. On the other hand, the heat insulating container 3 equipped with the detection element 1 is installed on the installation base 8 via the pedestal 9, independently of the cooler 2. In this case, a small gap is left between the flange 23 of the cooler 2 and the heat insulating container 3 to prevent them from coming into direct contact with each other. In this assembled state, the remaining space between the expansion cylinder 21 on the cooler side and the inner cylinder 31 of the heat insulating container 3 is filled with a heat insulating material indicated by the reference numeral 10. As this heat insulating material, for example, granular foamed resin such as expanded polystyrene is suitable, and the remaining space is filled with the cooler 2 and the heat insulating container 3 assembled on the installation base 8. If there is a possibility that the heat insulating material 10 may impede the pressing function of the spring 6, the outer periphery of the spring 6 may be covered with a tube to prevent the heat insulating material 10 from entering. According to the above configuration, the heat insulating container equipped with the detection element 1 and the cooler 2 are not connected rigidly as in the conventional configuration shown in FIG. Cooler 2
3 is supported on an installation base 8 in a vibration-proof manner. Therefore, the vibrations of the cooler 2 do not directly propagate to the detection element 1, and it is possible to prevent as much as possible the vibrations of the cooler 2 from imparting noise to the detection element 1. Moreover, since the space between the inner cylinder 31 of the heat insulating container 3 and the expansion cylinder 21 on the cooler side is filled with the heat insulating material 10, it is possible to effectively prevent heat from entering from the outside. It is possible to effectively prevent the effects of thermal noise by maintaining cooling. Next, FIG. 2 shows an embodiment that is a further development of the embodiment shown in FIG. In this embodiment, in addition to the configuration shown in FIG. The heat insulating material 10 filled in the remaining space between the tube 31 and the expansion cylinder 22 is sealed within the space. As a result, granular and bulk filled insulation material 10
can be effectively prevented from spilling out of the space.

[Effect of the idea]

As described above, according to this invention, the cooler and the heat insulating container are each independently installed on the installation base, and the remaining space between the inner cylinder of the heat insulating container and the expansion cylinder on the cooler side is By filling the space with a heat insulating material, it is possible to prevent heat from entering from the outside and to effectively prevent the generation of noise in the output signal of the detection element due to vibrations of the cooler.

[Brief explanation of the drawing]

FIGS. 1 and 2 are sectional views of different embodiments of this invention, respectively, and FIG. 3 is a sectional view of the assembled structure of a conventional minute signal detection device. In the figure, 1...detection element, 2...cooler, 21...expansion cylinder, 22...cold station, 23
...Flange, 4...Flexible heat transfer member, 8...
... Installation base, 10 ... Heat insulating material, 11 ... Flexible sealing member.

Claims (1)

[Scope of Claim for Utility Model Registration] 1) A heat insulating container equipped with a built-in minute signal detection element such as an infrared sensor is installed surrounding the expansion cylinder of a cooler, and in this installed state, a cold is formed at the top of the expansion cylinder. In a minute signal detection device in which a station and the detection element are heat-transfer coupled and the detection element is cooled by a cooler, the cooler and the heat insulating container are each independently installed on an installation base. In addition, a minute signal detection device characterized in that a remaining space between the heat insulating container and the expansion cylinder on the cooler side is filled with a heat insulating material. 2) Utility Model Registration The minute signal detection device according to claim 1, wherein the heat insulating material is a granular foamed resin. 3) Utility Model Registration The minute signal detection device according to claim 1, characterized in that the cooler is supported on an installation base in a vibration-proof manner. 4) Utility Model Registration In the minute signal detection device according to claim 1, a flange is provided at the lower part of the expansion cylinder on the cooler side, and a heat insulating material is used to seal in the gap between the flange and the heat insulating container facing the flange. A minute signal detection device characterized in that the device is connected with a flexible sealing member.