JPH06281497A - Infrared ray detector - Google Patents

Abstract

PURPOSE:To provide an infrared ray detector excellent in reliability by preventing a compressor from electric errosion, preventing damage to a connecting pipe installing part due to rocking vibration, protecting a cold finger bottom part against vibration external force, and preventing a decrease in accuracy due to temp. change. CONSTITUTION:A compressor 5 is installed in the recessed part of a compressor- installing plate 7 having a radiating fin for an infrared ray detector and is positioned in a chassis 4. An O-ring 17 is interposed between a cold finger 8 and a thermal conduction block 9. In addition, a dewer 2 is installed on an axisymmetric cylindrical dewer holder 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared detecting apparatus for generating a thermal image by capturing infrared rays emitted from an object with an infrared detecting element cooled to an extremely low temperature.

[0002]

15 is a perspective view showing a conventional infrared detecting device, FIG. 16 is a side sectional view of FIG. 15, FIG. 17 is a view showing a deformation of a compressor mounting plate due to rocking vibration, and FIG. It is a figure which shows the bimetal deformation | transformation of a conduction block. In FIG. 16, 1 is a lens unit, 2 is a cylindrical dewar that is arranged on the same axis as the lens unit 1 and has an infrared detection element 3 inside, and 4 is a front surface of the engaging surface with the lens unit 1. A chassis having a partition for mounting the dewar 2 on its bottom surface, 5 is a compressor for cooling the dewar 2, 6
Is a connecting pipe for supplying a refrigerant from the compressor 5 to the dewar 2, 7 is a compressor mounting plate arranged so as to fix the compressor 5 to the rear surface of the chassis 4, and 8 is an opposite surface of the infrared detecting element 3 of the dewar 2. The arranged cold fingers, 9 are heat-conducting blocks that engage one of them with the cylindrical surface of the cold finger 8 and engage the other with the bottom surface of the chassis 4, 10 is a fan for cooling the compressor 5, 11 is a fan 10 and the compressor. A cover arranged to enclose the mounting plate 7, 1
Reference numeral 2 is cooling air, 15 is heat conducting grease for cold fingers applied to the mating portion of the cold fingers 8 and the heat conducting block 9, and 16 is heat conducting grease for chassis portion applied to the engaging portions of the heat conducting block 9 and the chassis 4. Indicates. The cylindrical surface of the cold finger 8 and the mating portion of the heat conduction block 9 have a clearance of about 0.3 mm,
It is considered that the chassis 4 and the cold finger 8 do not interfere with each other even if they behave differently when vibration is applied. The interior of the lens unit 1 and the chassis 4 is a closed room as a measure against condensation and dust.

Next, the operation will be described. Compressor 5 and cold finger 8 are connecting pipes 6
, And a high-pressure gas such as helium or argon is enclosed in the inside. When the piston moves inside the compressor 5 and the high-pressure gas is repeatedly compressed, the high-pressure gas moves through the connecting pipe 6, and the pressure fluctuation moves the displacer in the cold finger 8 to move the tip of the cold finger 8 by adiabatic expansion of the displacer. Cools to an extremely low temperature by the endothermic action. The infrared detection element 3 mounted inside the dewar 2 having a vacuum inside is also cooled to an extremely low temperature. At this time, the infrared rays that have passed through the lens unit 1 form an image on the infrared detection element 3 and an image signal is sent. Further, the heat of the cold fingers 8 is efficiently transferred from the cold finger heat conducting grease 15 to the chassis 4 via the heat conducting block 9 and the chassis heat conducting grease 16 to impair the cooling performance of the device. There is no such thing.

[0004]

The conventional infrared detector has the above-mentioned structure and has the following problems. First, the fan 10 arranged in the cover 11
The cooling air 12 was directly blown to the compressor 5 exposed to the outside to release the heat generated by the compressor 5. Therefore, the compressor 5, which uses dissimilar metals for each component, uses the cooling air 12 that contains a lot of humidity and salt.
However, there is a problem in that there is a high possibility that electrolytic corrosion will occur at the joint portion when exposed to heat.

Further, although the compressor 5 has a large mass, it is fixed to the flat plate-shaped compressor mounting plate 7 by only one surface, so that the vertical vibration 13
When the plate 7 is applied, the plate 7 is deformed to cause the rocking vibration 14, and a large stress is generated in the connecting pipe 6, which causes a problem that the connecting pipe 6 is damaged.

Although the cold finger thermal conductive grease 15 has a clearance of about 0.3 mm in the entire circumference, the assembly precision of the dewar 2 and the cold finger 8 with respect to the chassis 4 varies depending on the clearance. As a result, in the stage after assembly, there will be a portion where the clearance can hardly be secured. Therefore, when an external vibration force is applied during operation of the device, the cold fingers 8 and the heat conduction block 9 mechanically interfere with each other, resulting in damage to the roots of the cold fingers.

Further, since the dewar 2 is fixed to the partition part standing upright from the chassis 4, the partition part causes a bimetal deformation 22 due to temperature change, and the lens unit 1 and the dewar 2 are displaced from the same axis. There was a problem.

The present invention has been made to solve the above problems, and prevents electrolytic corrosion of the compressor, improves the vibration resistance of the connecting pipe portion and the cold finger portion, and further improves the vibration resistance due to temperature change. The objective is to obtain an infrared detection device with excellent reliability by eliminating the axial misalignment between the lens unit and Dewar.

[0009]

In the infrared detector according to the present invention, the compressor is mounted in the chassis which is closed from the outside, and the compressor mounting plate having high rigidity is mounted on the two surfaces thereof. It was done. In addition, the clearance between the cold fingers and the heat conduction block is set to be larger than 0.3 mm of the conventional type, and O-rings are provided on both sides of the cold finger heat conduction grease layer applied between the cold fingers and the heat conduction block. In addition, the mounting part of the dewar is formed into an axisymmetric cylindrical shape.

Further, the infrared detecting device according to the present invention is
The compressor is mounted in a chassis that is sealed from the outside, and the compressor mounting plate having high rigidity is mounted on its two surfaces. Further, the clearance between the cold fingers and the heat conduction block is set to be larger than the conventional 0.3 mm, and a flexible liquid jacket is arranged between the cold fingers and the heat conduction block. Further, the attachment part of the dewar is formed into an axisymmetric cylindrical shape.

Further, in the infrared detector according to the present invention, the compressor is mounted in the chassis which is sealed from the outside, and the compressor mounting plate having high rigidity is mounted on the two surfaces thereof. . In addition, the clearance between the cold finger and the heat conduction block is set to be larger than 0.3 mm of the conventional one, and a flexible thin plate wave type metal spring is arranged between the cold finger and the heat conduction block. Further, the attachment part of the dewar is formed into an axisymmetric cylindrical shape.

Furthermore, in the infrared detector according to the present invention, the compressor is mounted in the chassis which is hermetically sealed from the outside, and the compressor mounting plate having high rigidity is mounted on the two surfaces thereof. is there. In addition, the clearance between the cold finger and the heat conduction block is set to be larger than the conventional 0.3 mm, and a flexible flat braided wire conductive material is arranged between the cold finger and the heat conduction block. Further, the attachment part of the dewar is formed into an axisymmetric cylindrical shape.

In the infrared detector according to the present invention, the compressor and the fan are mounted in the chassis which is sealed from the outside, and the compressor is attached to the lower portion of the box chassis having high rigidity. In addition, the clearance between the cold finger and the fin block is set to 0.
The diameter of the dewar is 3 mm or less, and the attachment part of the dewar is an axisymmetric cylinder.

The infrared detector according to the present invention is
The compressor and the fan are mounted in a chassis that is sealed from the outside, and the compressor is attached to the bottom of a box chassis having high rigidity. Also, the clearance between the cold fingers and the fin block is set to 0.3 mm or less, the first heat pipe engaging one with the fin block and the other engaging with the inner surface of the upper chassis, and one of the lower chassis pipes near the compressor. A second heat pipe that engages with the inner surface and the other engages with the inner surface of the upper portion of the chassis is attached, and the attachment portion of the dewar has an axisymmetric cylindrical shape.

Further, in the infrared detecting device according to the present invention, the compressor and the fan are mounted in the chassis which is sealed from the outside, and the compressor is mounted in the lower part of the box chassis having high rigidity. Also,
The clearance between the cold fingers and the fin block is set to 0.3 mm or less of the conventional one, one is engaged with the fin block, the other is engaged with the inner surface of the cover having fins on the outer surface, and one is engaged with the compressor. A second heat pipe that engages with the inner surface of the cover that has fins on the outer surface is attached to the other, and the attachment portion of the dewar has an axially symmetric cylindrical shape.

Furthermore, in the infrared detector according to the present invention, the compressor and the fan are mounted in the chassis which is sealed from the outside, and the compressor is mounted in the lower portion of the box chassis having high rigidity. Further, the clearance between the cold fingers and the fin block is set to 0.3 mm or less of the conventional one, and an electronic cooling element that engages with the inner surface of the cover having fins on the outer surface and one that engages with the fin block and the other with the electronic cooling element. A first heat pipe to be fitted and a second heat pipe, one of which is engaged with the compressor and the other of which is engaged with the electronic cooling element, are attached. Further, the attachment part of the dewar is formed into an axisymmetric cylindrical shape. It was done.

In the infrared detector according to the present invention, the compressor and the fan are mounted in the chassis which is sealed from the outside, and the compressor is attached to the lower part of the box chassis having high rigidity. In addition, the clearance between the cold finger and the fin block is set to 0.
3 mm or less, the first electronic cooling element that engages with the fin block, the second electronic cooling element that engages with the compressor, one engages with the first electronic cooling element, and the other has a fin on the outer surface. A first heat pipe engaged with the inner surface of the cover, and a second heat pipe engaged with the second electronic cooling element on one side and with the fin on the outer surface on the other side. In addition, the attachment part of the dewar is formed into an axisymmetric cylindrical shape.

The infrared detecting device according to the present invention is
The compressor and the fan are mounted in a chassis that is sealed from the outside, and the compressor is attached to the bottom of a box chassis having high rigidity. Further, the clearance between the cold fingers and the fin block is set to 0.3 mm or less of the conventional one, the electronic cooling element having the fins that engage with the inner surface of the chassis, and the temperature sensor attached to the outer surface and the inner surface of the chassis. The mounting portion has an axisymmetric cylindrical shape.

Further, in the infrared detector according to the present invention, the compressor and the fan are mounted in the chassis which is sealed from the outside, and the compressor is mounted in the lower part of the box chassis having high rigidity. Also,
The clearance between the cold fingers and the fin block is 0.3mm or less, and the dewar holders are arranged on the circumference at 120 ° intervals around the shaft to support the dewar at three points around the shaft. The electronic cooling element is attached.

[0020]

In the infrared detector according to the present invention, since the compressor is in the closed chassis and does not come into contact with the cooling air containing a lot of moisture and salt, it is possible to prevent the occurrence of electrolytic corrosion. Further, the compressor mounting plate has high rigidity due to the heat dissipating fins provided on itself, and the rigidity after mounting the compressor is dramatically improved by mounting the compressor on the two surfaces in the recess. Therefore, the rocking vibration does not occur in the compressor mounting portion, the stress generated in the connecting pipe becomes small, and the vibration resistance of the connecting pipe can be improved. Further, since the clearance is sufficiently maintained between the cold finger cylindrical surface and the heat conduction block, the cold finger portion can be protected from the vibration external force and the reliability against the vibration external force can be enhanced. In addition, the O-rings placed on both sides of the cold finger heat conductive grease layer applied between the cold finger and the heat conductive block prevent the cold finger heat conductive grease from flowing due to sufficient clearance to prevent the cold finger from flowing. Does not impair the cooling performance of the part. In addition, the axially symmetric cylindrical dewar holder has a dewar attached to the center of the axis, and the deformation of the axially symmetric cylindrical dewar holder due to temperature changes is axially symmetric with respect to the dewar mounting axis, and there is axial misalignment between the lens unit and the dewar. It does not occur, and the reliability against temperature change can be improved.

In addition, the infrared detecting device according to the present invention includes a bag-shaped flexible liquid jacket, which is provided between the cold finger portion and the heat conduction block, and which has a liquid having excellent heat conduction therein. The heat of the section is efficiently transmitted to the chassis via the heat conduction block and the heat conduction grease of the chassis section.

Further, according to the present invention, a flexible thin plate corrugated metal spring is formed by bending a single plate excellent in heat conduction into a corrugated shape so that the clearance between the cold finger cylindrical surface and the heat conduction block is reduced. Since it is sufficiently maintained, the cold finger portion can be protected from the vibration external force, and the reliability against the vibration external force can be improved.

Furthermore, according to the present invention, a flat braided wire type conductive material having flexibility that is formed by braiding dozens of fine wire rods excellent in heat conduction provides a sufficient clearance between the cold finger cylindrical surface and the heat conductive block. Since it is kept, the cold finger portion can be protected from the vibration external force, and the reliability against the vibration external force can be enhanced. Further, due to the flexible braided wire type conductive material, the heat of the cold finger portion is efficiently transmitted to the chassis via the heat conductive block and the heat conductive grease of the chassis portion, and the cooling performance of the device is not impaired.

According to the present invention, since all the constituent parts are in a closed chassis and do not come into contact with the cooling air containing a large amount of moisture and salty water, it is possible to prevent the occurrence of electrolytic corrosion of the compressor, and also in the fan, around the rotating part. It is possible to prevent breakdown due to rusting. Further, by mounting a fan, which is a main source of noise generation, inside the chassis, the noise of the device can be reduced. On the other hand, since the compressor is attached to the lower portion of the box-shaped chassis having high rigidity by the radiation fins, rocking vibration does not occur at the compressor attachment portion. Also, by fitting the fin block alone to the cold finger cylindrical surface and engaging it with the dewar holder, each behavior of the dewar holder, cold fingers, and fin block becomes the same movement when vibration is applied, In order to avoid mechanical interference due to another behavior, the clearance dimension with the heat conduction block was set to 0.3 mm or less to reduce the thermal resistance, and heat was dissipated by the heat transfer from the lens unit via the Dewar holder and the fan Due to the forced convection heat transfer by, the heat generating portion can be efficiently cooled.

Further, according to the present invention, the heat of the cold fingers transmitted to the fin block is transferred to the upper part of the chassis by the first heat pipe, while the heat of the compressor is transferred to the chassis by the second heat pipe via the chassis. Heat transfer to the top. Further, by conducting heat from the chassis to the cover having fins on the outer surface, it is possible to more efficiently radiate heat to the outside air.

Furthermore, according to the present invention, the heat of the cold fingers transmitted to the fin block is directly transferred to the cover having the fins on the outer surface by the first heat pipe, while the heat of the compressor is also transferred by the second heat pipe.
By directly transferring the heat to the cover having the fins on the outer surface, it is possible to radiate heat to the outside air more efficiently.

According to the present invention, the heat of the cold fingers transmitted to the fin block is transferred to the electronic cooling element engaging with the inner surface of the cover having the fins on the outer surface by the first heat pipe, while the heat of the compressor is also transferred to the second. The heat pipe transfers heat to the electronic cooling element engaged with the inner surface of the cover. Since the electronic cooling element can lower the temperature of the heat absorbing portion by the Peltier effect, the operating temperature of the cold finger and the compressor can be lowered.

Further, according to the present invention, the heat of the cold fingers transmitted to the fin block is transmitted to the electronic cooling element,
While heat is directly transferred to the cover having fins on the outer surface thereof, heat of the compressor is also transferred to the electronic cooling element, and is transferred to the cover having fins on the outer surface directly by the second heat pipe. Since the thermoelectric cooler can lower the temperature of the heat absorption part by the Peltier effect,
The operating temperature of the cold finger and the compressor can be lowered.

Furthermore, the present invention detects the temperature difference by the temperature sensors on the outer and inner surfaces of the chassis, cools the atmosphere by the electronic cooling element when the inside of the chassis is high, and cools the electronic cooling element when the inside of the chassis is low. By heating the atmosphere with, the breathing action of the device due to the temperature difference is suppressed,
The replenishment interval of the enclosed nitrogen can be extended.

According to the present invention, the dewar is held by the dewar holder in which the columns are arranged on the circumference at 120 ° intervals around the axis, and the electronic cooling that engages with each column by the amount of deviation detected by the image processing system. By heating or cooling the element, the pillar can be expanded and contracted, so that the optical axis is not displaced.

[0031]

【Example】

Example 1. FIG. 1 shows a first infrared detecting device according to the present invention.
FIG. 15 is a cross-sectional view showing an example of the above embodiment, and FIG. 15 is a view showing deformation of the axially symmetric cylindrical dewar holder 18 due to temperature change, and 1 to 6, 8 to 15 and 16 are exactly the same as the above conventional device. belongs to. In FIG. 1, reference numeral 7 is a compressor mounting plate which has a concave portion for mounting the compressor 5 on one surface thereof and a heat radiation fin on the other surface thereof and is arranged so as to be fixed to the rear surface of the chassis 4. Two sides of this compressor 5 are compressor mounting plates 7
It is fixed in the recess. Further, since the compressor 5 is mounted in the recess of the compressor mounting plate, it is located inside the chassis 4 while being sealed from the outside. The clearance between the cold finger 8 and the heat conduction block 9 is larger than the conventional 0.3 mm, and both sides of 15 layers of the cold finger heat conduction grease applied between the cold finger 8 and the heat conduction block 9 are provided. An O-ring 17 is provided on the bottom to prevent the flow of the heat conductive grease 15 of the cold finger portion. Reference numeral 18 denotes an axially symmetric cylindrical dewar holder that engages with the lens unit 1, fixes the dewar 2 at the axial center of the cylinder, and is arranged such that the central axes of the lens unit and the dewar 2 are on the same line.

In the infrared detector constructed as described above, the compressor 5 is located inside the closed chassis 4 and does not come into contact with the cooling air 12 containing a large amount of moisture or salt. It can be prevented. In addition, the compressor mounting plate 7 has high rigidity due to the radiation fins provided on itself, and the rigidity after mounting the compressor is dramatically improved by mounting the compressor 5 on two sides in the recess. By doing so, the rocking vibration 14 is not generated in the attachment portion of the compressor 5, the stress generated in the connecting pipe 6 becomes small, and the vibration resistance of the connecting pipe 6 can be improved. Further, since a large clearance is secured between the cylindrical portion of the cold finger 8 and the heat conduction block 9, and the flexible O-ring 17 and the heat conduction grease 15 of the cold finger portion are arranged there, vibration is prevented. Even if an external force is applied to cause a relative displacement between the cylindrical portion of the cold finger 8 and the heat conduction block 9, the deformation of the flexible O-ring 17 absorbs the displacement of the cold finger 8 and the heat conduction block 9, The two do not mechanically interfere with each other, and a large stress does not occur at the root of the cold finger 8. Further, since the dewar 2 is fixed to the axial center of the axially symmetric cylindrical dewar holder 18, even if the dewar holder 18 is deformed due to temperature change, only the distance between the lens unit 1 and the dewar 2 changes, and an axial deviation occurs. do not do.

Example 2. FIG. 15 is a sectional view showing an embodiment of the second embodiment of the infrared detector according to the present invention, and FIG.
FIG. 4 is a diagram showing deformation of the axially symmetric cylindrical dewar holder 18 due to temperature change, and 1 to 6, 8 to 14 and 16 are exactly the same as those of the conventional device. In FIG. 2, reference numeral 7 denotes a compressor mounting plate which has a concave portion for mounting the compressor 5 on one surface thereof and a heat radiation fin on the other surface thereof and is arranged so as to be fixed to the rear surface of the chassis 4.
Two sides of the compressor 5 are fixed in the recesses of the compressor mounting plate 7. Further, since the compressor 5 is mounted in the recess of the compressor mounting plate, it is located inside the chassis 4 while being sealed from the outside. The clearance between the cold finger 8 and the heat conduction block 9 is set larger than 0.3 mm of the conventional one, and a flexible liquid jacket 19 is arranged between the cold finger 8 and the heat conduction block 9. 18
Is a cylindrical dewar holder that is engaged with the lens unit 1, fixes the dewar 2 at the axial center of the cylinder, and is arranged so that the central axes of the lens unit and the dewar 2 are on the same line.

In the infrared detector constructed as described above, the compressor 5 is located inside the closed chassis 4 and does not come into contact with the cooling air 12 containing a large amount of moisture or salt. It can be prevented. In addition, the compressor mounting plate 7 has high rigidity due to the radiation fins provided on itself, and the rigidity after mounting the compressor is dramatically improved by mounting the compressor 5 on two sides in the recess. By doing so, the rocking vibration 14 is not generated in the attachment portion of the compressor 5, the stress generated in the connecting pipe 6 becomes small, and the vibration resistance of the connecting pipe 6 can be improved. In addition, since a large clearance is secured between the cylindrical portion of the cold finger 8 and the heat conduction block 9 and a flexible liquid jacket is arranged therein, an external vibration force is applied and the cold finger 8 is
Even if relative displacement occurs between the cylindrical portion and the heat conduction block 9, the deformation of the flexible liquid jacket 19 may absorb the displacement of the cold finger 8 and mechanically interfere with each other. Therefore, no large stress is generated at the root of the cold finger 8. Further, since the dewar 2 is fixed to the axial center of the axially symmetric cylindrical dewar holder 18, even if the dewar holder 18 is deformed due to temperature change, only the distance between the lens unit 1 and the dewar 2 changes, and an axial deviation occurs. do not do.

Example 3. 3 is a sectional view showing an embodiment of the third embodiment of the infrared detecting device according to the present invention, FIG. 4 is an enlarged view of the thin plate wave type metal spring assembly in FIG. 3, and FIG. 15 is an axially symmetric cylindrical dewar holder 18. It is a figure which shows the deformation | transformation by the temperature change of 1), 1-6, 8-14, and 16 are completely the same as the said conventional device. In FIG. 3, reference numeral 7 denotes a compressor mounting plate which has a concave portion for mounting the compressor 5 on one surface thereof and a heat radiation fin on the other surface thereof and is arranged so as to be fixed to the rear surface of the chassis 4. Two sides of the compressor 5 are fixed in the recesses of the compressor mounting plate 7. Further, since the compressor 5 is mounted in the recess of the compressor mounting plate, it is located inside the chassis 4 while being sealed from the outside. The clearance between the cold finger 8 and the heat conduction block 9 is larger than the conventional 0.3 mm, and the flexible thin plate wave type metal spring 20 is arranged between the cold finger 8 and the heat conduction block 9. ing. 1
Reference numeral 8 denotes an axially symmetric cylindrical dewar holder which is engaged with the lens unit 1, fixes the dewar 2 at the axial center of the cylinder, and is arranged so that the central axes of the lens unit and the dewar 2 are on the same line.

In the infrared detector constructed as described above, first, the compressor 5 is located inside the closed chassis 4 and does not come into contact with the cooling air 12 containing a lot of humidity and salty water, so that the occurrence of electrolytic corrosion occurs. It can be prevented. In addition, the compressor mounting plate 7 has high rigidity due to the radiation fins provided on itself, and the rigidity after mounting the compressor is dramatically improved by mounting the compressor 5 on two sides in the recess. By doing so, the rocking vibration 14 is not generated in the attachment portion of the compressor 5, the stress generated in the connecting pipe 6 becomes small, and the vibration resistance of the connecting pipe 6 can be improved. In addition, a large clearance is secured between the cylindrical portion of the cold finger 8 and the heat conduction block 9, and the thin plate wave type metal spring 2 having flexibility is provided there.
Since 0 is arranged, even if a relative displacement occurs between the cylindrical portion of the cold finger 8 and the heat conduction block 9 due to the vibration external force, the cold deformation is caused by the flexible thin plate wave type metal spring 20. The displacement of the fingers 8 and the heat conduction block 9 is absorbed, and the two do not mechanically interfere with each other,
No large stress is generated at the root of the cold finger 8. In addition, a thin plate wave type metal spring 2 having flexibility
0 itself has the characteristic of a spring, the clearance between the cold finger 8 cylindrical portion and the heat conduction block 9 is fixed, and the dewar 2 is fixed to the axial center of the axially symmetric cylindrical dewar holder 18. By dewar holder 1
Even if 8 is deformed, the distance between the lens unit 1 and the dewar 2 only changes, and no axial misalignment occurs.

Example 4. FIG. 5 is a sectional view showing an embodiment of the fourth embodiment of the infrared detector according to the present invention, and FIG.
5 is an enlarged view of the flat braided wire type conductive material assembly in FIG. 5, FIG. 7 is a view showing deformation of the axially symmetric cylindrical dewar holder 18 due to temperature change, and 1 to 6, 8 to 14 and 16 are the conventional devices. Is exactly the same as. In FIG. 5, reference numeral 7 denotes a compressor mounting plate which has a concave portion for mounting the compressor 5 on one surface thereof and a heat radiation fin on the other surface thereof and is arranged so as to be fixed to the rear surface of the chassis 4. Two sides of the compressor 5 are fixed in the recesses of the compressor mounting plate 7. Further, since the compressor 5 is mounted in the recess of the compressor mounting plate, it is located inside the chassis 4 while being sealed from the outside. The clearance between the cold fingers 8 and the heat conduction block 9 is larger than the conventional 0.3 mm, and a flexible flat knitted wire type conductive material 21 is arranged between the cold fingers 8 and the heat conduction block 9. ing. 18
Is a cylindrical dewar holder that is engaged with the lens unit 1, fixes the dewar 2 at the axial center of the cylinder, and is arranged so that the central axes of the lens unit and the dewar 2 are on the same line.

In the infrared detector constructed as described above, since the compressor 5 is located inside the closed chassis 4 and does not come into contact with the cooling air 12 containing a large amount of moisture or salt, electrolytic corrosion does not occur. It can be prevented. In addition, the compressor mounting plate 7 has high rigidity due to the radiation fins provided on itself, and the rigidity after mounting the compressor is dramatically improved by mounting the compressor 5 on two sides in the recess. By doing so, the rocking vibration 14 is not generated in the attachment portion of the compressor 5, the stress generated in the connecting pipe 6 becomes small, and the vibration resistance of the connecting pipe 6 can be improved. In addition, a large clearance is secured between the cylindrical portion of the cold finger 8 and the heat conduction block 9, and there is flexibility in the flat braided wire conductive material 21.
Therefore, even if a relative displacement occurs between the cylindrical portion of the cold finger 8 and the heat conduction block 9 due to an external vibration force, the deformation of the flexible braided wire conductive material 21 causes the cold finger 8 to deform. 8 Cylindrical part and heat conduction block 9
Of the cold finger 8 does not interfere mechanically with each other, and a large stress does not occur at the root of the cold finger 8. Further, the flat knitted wire type conductive material 21 itself having flexibility has a spring characteristic, and has an effect of keeping a constant clearance between the cylindrical portion of the cold finger 8 and the heat conduction block 9. Further, since the dewar 2 is fixed to the axial center of the axially symmetric cylindrical dewar holder 18, even if the dewar holder 18 is deformed due to temperature change, only the distance between the lens unit 1 and the dewar 2 changes, and an axial deviation occurs. do not do.

Example 5. FIG. 7 is a sectional view showing an embodiment of the fifth embodiment of the infrared detector according to the present invention, and FIG.
FIG. 4 is a view showing deformation of the axially symmetric cylindrical dewar holder 18 due to temperature change, and 1 to 5, 5, 8, 10 and 15 are exactly the same as those of the conventional device. In FIG. 7, 1
Reference numeral 8 denotes an axially symmetric cylindrical dewar holder which is engaged with the lens unit 1, fixes the dewar 2 at the axial center of the cylinder, and is arranged such that the central axes of the lens unit 1 and the dewar 2 are on the same line. Further, 4 is a chassis having fins on the lower portion of the outer surface thereof, and the inside of the chassis 4 is sealed from the outside. The compressor 5 is fixed to the lower surface of the chassis opposite the fins, and the fan 10 is also fixed to the inside of the chassis 4. The clearance between the cold finger 8 and the fin block 23 is smaller than the conventional 0.3 mm, and the heat conductive grease 15 is provided in the clearance portion.
Is filled. The fin block 23 is fixed to the Dewar holder 18. The interior of the chassis 4 is filled with nitrogen gas in order to prevent dew condensation on the lens unit 1.

In the infrared detector constructed as described above, since the compressor 5 is located inside the closed chassis 4 and does not come into contact with the cooling air 12 containing a large amount of moisture or salt, electrolytic corrosion is not generated. It can be prevented. Further, the fan 10 is also inside the closed chassis 4, and it is possible to prevent a failure due to rusting around the rotating portion of the fan 10. Also, fan 1
Since 0 is mounted inside the closed chassis 4, the propagation of sound to the outside can be suppressed and the noise of the device can be reduced. Since the compressor 5 is attached to the lower portion of the box-shaped chassis 4 having high rigidity by the radiation fin, the rigidity after the installation of the compressor 5 is dramatically improved, and the rocking vibration 14 is generated at the compressor 5 mounting portion. The stress generated in the connecting pipe 6 becomes small, and the vibration resistance of the connecting pipe 6 can be improved. In addition, the fin block 23 alone is fitted to the cylindrical surface of the cold finger 8 and the dewar holder 18
Since the behaviors of the dewar holder 18, the cold finger 8 and the fin block 23 are the same when vibration is applied by fixing them to the above, it is necessary to avoid mechanical interference due to another behavior. The clearance dimension of the conductive block is set to 0.3 mm or less to reduce the thermal resistance, heat is dissipated by the heat transfer from the lens unit 1 via the Dewar holder 18, and the heat is efficiently transferred from the heat generating part to the inner surface of the cover by the forced convection by the fan. Cooling capacity is not impaired because it is performed well. Further, since the dewar 2 is fixed to the axial center of the axially symmetric cylindrical dewar holder 18, even if the dewar holder 18 is deformed due to temperature change, only the distance between the lens unit 1 and the dewar 2 changes, and an axial deviation occurs. do not do.

Example 6. FIG. 8 is a sectional view showing a sixth embodiment which is a further improvement of the fifth embodiment, and FIG. 15 is a view showing deformation of the axially symmetric cylindrical dewar holder 18 due to temperature change. Reference numerals 10 and 15 are exactly the same as those of the conventional device. Reference numeral 25 denotes a first heat pipe, one of which is engaged with the fin block 23 and the other of which is engaged with the inside of the upper surface of the chassis 4. 26 is a second heat pipe,
One is engaged with the lower inner surface of the chassis 4 near the compressor 5 and the other is engaged with the inside of the upper surface of the chassis 4.

In the infrared detector constructed as described above, the heat generated by the cold fingers 8 and the compressor 5 is covered by the respective heat pipes through the upper surface of the chassis 24 in addition to the heat path described in the fifth embodiment. The heat transfer to the outside air by the heat conduction to the outside air by the fins provided in the cover 24 is further efficiently performed, and the cooling capacity can be improved.

Example 7. FIG. 9 is a sectional view showing a seventh embodiment which is a further improvement of the sixth embodiment, and FIG. 15 is a view showing deformation of the axially symmetric cylindrical dewar holder 18 due to temperature change. Reference numerals 10 and 15 are exactly the same as those of the conventional device. Reference numeral 25 denotes a first heat pipe, one of which is engaged with the fin block 23 and the other of which is engaged with the inner surface of the cover 24. Reference numeral 26 is a second heat pipe, one of which is engaged with the compressor 5 and the other of which is engaged with the inner surface of the cover 24.

In the infrared detector constructed as described above, the heat generated in the cold fingers 8 and the compressor 5 is directly conducted to the cover 24 without passing through the chassis 4, and the fins of the cover 24 allow the heat to be released to the outside air. By transferring the heat, the heat transfer path has no heat resistance in the chassis, so that the heat transfer to the outside air is efficiently performed, and the cooling capacity can be improved.

Example 8. FIG. 10 is a cross-sectional view showing an eighth embodiment which is a further improvement of the seventh embodiment, and FIG. 15 is a view showing deformation of the axially symmetric cylindrical dewar holder 18 due to temperature change. Reference numerals 10 and 15 are exactly the same as those of the conventional device. Reference numeral 25 denotes a first heat pipe, one of which is engaged with the fin block 23 and the other of which is engaged with the electronic cooling element 27 which is engaged with the inner surface of the cover 24. Reference numeral 26 is a second heat pipe, one of which is engaged with the compressor 5 and the other of which is engaged with the electronic cooling element 27 which is engaged with the inner surface of the cover 24.

In the infrared detector constructed as described above, a DC current is passed through the electronic cooling element 27, whereby a temperature difference due to the Peltier effect can be generated on both surfaces of the electronic cooling element 27. That is, the heat pipe 2
Since the surfaces with which 5 and 26 are engaged can be made to have a low temperature and the surfaces with which the cover 24 is engaged can be made to have a high temperature, the temperature of the cold finger 8 and the compressor 5 can be further lowered and the cooling performance can be improved. be able to.

Example 9. FIG. 11 is a sectional view showing a ninth embodiment which is a further improvement of the seventh embodiment, and FIG. 15 is a view showing deformation of the axially symmetric cylindrical dewar holder 18 due to temperature change. Reference numerals 10 and 15 are exactly the same as those of the conventional device. Reference numeral 25 is a first heat pipe, one of which is engaged with the first electronic cooling element 28 which is engaged with the fin block, and the other of which is engaged with the inner surface of the cover 24. Reference numeral 26 is a second heat pipe, one of which is engaged with the second electronic cooling element 29 which is engaged with the compressor 5 and the other of which is engaged with the inner surface of the cover 24.

In the infrared detecting device configured as described above, the first and second electronic cooling elements 2 are formed by applying a direct current to the first and second electronic cooling elements 28 and 29.
A temperature difference due to the Peltier effect can be generated on both surfaces of Nos. 8 and 29. That is, since the surfaces where the fin blocks 23 and the compressor 5 are engaged can be made to have a low temperature and the surfaces where the heat pipes 25 and 26 are engaged can be made to have a high temperature, the temperatures of the cold fingers 8 and the compressor 5 can be reduced. It can be further lowered to improve the cooling performance.

Example 10. FIG. 12 is a sectional view showing a tenth embodiment which is a further improvement of the fifth embodiment, and FIG. 15 is a view showing deformation of the axially symmetric cylindrical dewar holder 18 due to temperature change. Reference numerals 10 and 15 are exactly the same as those of the conventional device. Reference numeral 30 is an electronic cooling element having fins engaged with the inner surface of the chassis 4, and reference numeral 31 is a temperature sensor provided inside and outside the chassis 4.

In the infrared detecting device configured as described above, a DC current is caused to flow through the electronic cooling element 30 having fins, whereby a temperature difference due to the Peltier effect can be generated on both surfaces of the electronic cooling element 30 having fins. . This effect is reversible, and heat generation and heat absorption are reversed by changing the direction of the direct current. That is, temperature is detected by the temperature sensors provided inside and outside the chassis 4, and when the inside of the chassis 4 is at a high temperature, a direct current is caused to flow in the direction of cooling the nitrogen gas atmosphere 33 by the Peltier effect of the electronic cooling element having fins. When the temperature inside the chassis is low, a direct current is caused to flow in the direction in which the nitrogen gas atmosphere 33 is heated by the Peltier effect of the electronic cooling element having the fins so that the temperature inside the chassis 4 follows the outside air temperature, and the temperature difference between the inside and outside of the device is increased. It is possible to suppress the breathing action of the device generated by the above, and to extend the replenishment interval of the enclosed nitrogen gas 33.

Example 11. FIG. 13 is a sectional view showing an eleventh embodiment which is a further improvement of the fifth embodiment, and FIG.
3 is a side sectional view of FIG. 1, 3, 5, 8, 10 and 15
Is exactly the same as the above conventional device. Dewa 2 is a Duwa 2 with columns arranged on the circumference at 120 ° intervals around the axis.
Is held by a dewar holder 31 that supports three points.

In the infrared detector constructed as described above, the dewar 2 is held by the dewar holder 31 having columns on the circumference at 120 ° intervals around the axis, and is detected by an image processing system (not shown). Depending on the amount of optical axis deviation, the electronic cooling element 30 engaged with each column is heated or cooled, so that the columns can be expanded and contracted. That is, the machining accuracy of the parallelism between the contact surface of the lens unit and the dewar holder and the contact surface of the dewar holder and the cold finger related to the optical axis deviation, and the machining accuracy of the perpendicularity of the cold finger contact surface and the optical axis of the cold finger are the optical axis. Since each strut can be expanded and contracted and adjusted according to the amount of deviation, it is possible to eliminate optical axis deviation due to machining accuracy.

[0053]

As described above, according to the infrared detecting device of the present invention, damage of the connecting pipe mounting portion due to rocking vibration is eliminated, and electrolytic corrosion of the compressor due to cooling air containing a lot of humidity and salt is prevented. Since the O-ring with flexibility and the heat transfer grease of the cold fingers are arranged in the large secured clearance, the cold fingers are protected from vibration external force, and further, the axially symmetric cylindrical dewar holder Even if the Dewar is fixed at the center of the shaft and the Dewar holder is deformed due to temperature change, there is an excellent effect that the lens unit and the Dewar are not misaligned.

According to the present invention, the damage of the connecting pipe mounting portion due to rocking vibration is eliminated, the electrolytic corrosion of the compressor due to the cooling air containing a lot of humidity and salt is prevented, and the large secured clearance portion is provided. Since the flexible liquid jacket is arranged, the cold fingers are protected from vibration external force, and also
Further, the dewar is fixed to the axial center of the axially symmetric cylindrical dewar holder, and even if the dewar holder is deformed due to a temperature change, there is an excellent effect that the lens unit and the dewar are not misaligned.

Further, according to the present invention, damage to the connecting pipe mounting portion due to rocking vibration is eliminated, electrolytic corrosion of the compressor due to cooling air containing a large amount of humidity and salt is prevented, and a large clearance is secured. Since a thin plate wave type metal spring with flexibility is arranged, the cold fingers are protected from external vibration forces, and furthermore, the dewar is fixed to the axial center of the axially symmetric cylindrical dewar holder, and the dewar holder can be Even if it is deformed, there is an excellent effect that the axial displacement between the lens unit and Dewar does not occur.

Further, according to the present invention, damage to the connecting pipe attachment portion due to rocking vibration is eliminated, electrolytic corrosion of the compressor due to cooling air containing a lot of humidity and salt is prevented, and a large clearance is secured. Since the flexible braided wire conductive material is arranged, the cold fingers are protected from external vibration forces, and the dewar is fixed to the axial center of the axially symmetric cylindrical dewar holder. Even if it is deformed, there is an excellent effect that the axial displacement between the lens unit and Dewar does not occur.

Further, according to the present invention, the damage of the connecting pipe mounting portion due to the rocking vibration is eliminated, the electrolytic corrosion of the compressor and the failure of the fan due to the cooling air containing a lot of humidity and salt are prevented, and the clearance is further reduced. Excellent in that the damage due to the vibration of the cold finger is eliminated, and the dewar is fixed to the axial center of the axially symmetric cylindrical dewar holder, and even if the dewar holder is deformed due to temperature change, there is no axial misalignment between the lens unit and dewar. There is an effect.

According to the present invention, damage of the connecting pipe mounting portion due to rocking vibration is eliminated, electrolytic corrosion of the compressor and failure of the fan due to cooling air containing a lot of humidity and salt are prevented, and the clearance is further reduced. By eliminating the damage caused by the vibration of the cold fingers, transferring the heat of the compressor and cold fingers to the upper part of the chassis, and further transferring the heat from the chassis to the cover with fins on the outer surface, it is possible to efficiently radiate heat to the outside air. . Further, there is an excellent effect that the dewar is fixed to the axial center of the axially symmetric cylindrical dewar holder, and even if the dewar holder is deformed due to temperature change, the dewar of the lens unit and the dewar does not shift.

Further, according to the present invention, the damage of the connecting pipe mounting portion due to the rocking vibration is eliminated, the electrolytic corrosion of the compressor and the failure of the fan due to the cooling air containing a lot of humidity and salt are prevented, and the clearance is further reduced. By eliminating the damage caused by the vibration of the cold fingers and directly transferring the heat of the compressor and the cold fingers to the cover having the fins on the outer surface, it is possible to efficiently dissipate the heat to the outside air. Also,
Further, the dewar is fixed to the axial center of the axially symmetric cylindrical dewar holder, and even if the dewar holder is deformed due to a temperature change, there is an excellent effect that the lens unit and the dewar are not misaligned.

According to the present invention, damage to the connecting pipe mounting portion due to rocking vibration is eliminated, electrolytic corrosion of the compressor and failure of the fan due to cooling air containing a lot of humidity and salt are prevented, and the clearance is further reduced. The operating temperature can be further reduced by eliminating damage due to vibration of the cold fingers and transferring the heat of the compressor and the cold fingers to the cover having fins on the outer surface through the electronic cooling element. Further, there is an excellent effect that the dewar is fixed to the axial center of the axially symmetric cylindrical dewar holder, and even if the dewar holder is deformed due to temperature change, the dewar of the lens unit and the dewar does not shift.

Further, according to the present invention, damage to the connecting pipe mounting portion due to rocking vibration is eliminated, electrolytic corrosion of the compressor and failure of the fan due to cooling air containing a large amount of humidity and salt are prevented, and the clearance is further reduced. The damage due to vibration of the cold fingers can be eliminated, the breathing action of the device generated by the temperature difference between the inside and outside of the device can be suppressed, and the refilling interval of the enclosed nitrogen gas can be extended. Further, there is an excellent effect that the dewar is fixed to the axial center of the axially symmetric cylindrical dewar holder, and even if the dewar holder is deformed due to temperature change, the dewar of the lens unit and the dewar does not shift.

According to the present invention, damage to the connecting pipe attachment portion due to rocking vibration is eliminated, electrolytic corrosion of the compressor and failure of the fan due to cooling air containing a lot of humidity and salt are prevented, and the clearance is further reduced. There is an excellent effect that damage due to vibration of the cold finger is eliminated and optical axis deviation due to machining accuracy is eliminated.

[Brief description of drawings]

FIG. 1 is a sectional view showing an infrared detection device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an infrared detection device according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing an infrared detection device according to a third embodiment of the present invention.

4 is an enlarged view of the thin plate wave type metal spring assembly in FIG. 3. FIG.

FIG. 5 is a sectional view showing an infrared detector according to Embodiment 4 of the present invention.

6 is an enlarged view of the flat braided conductive material assembly in FIG.

FIG. 7 is a sectional view showing an infrared detector according to Embodiment 5 of the present invention.

FIG. 8 is a sectional view showing an infrared detection device according to a sixth embodiment of the present invention.

FIG. 9 is a sectional view showing an infrared detection device according to a seventh embodiment of the present invention.

FIG. 10 is a sectional view showing an infrared detector according to Embodiment 8 of the present invention.

FIG. 11 is a sectional view showing an infrared detection device according to a ninth embodiment of the present invention.

FIG. 12 is a sectional view showing an infrared detector according to Embodiment 10 of the present invention.

FIG. 13 is a sectional view showing an infrared detection device according to Example 11 of the present invention.

14 is a side sectional view of FIG.

FIG. 15 is a diagram showing deformation of an axially symmetric cylindrical dewar holder due to temperature change.

FIG. 16 is a perspective view showing a conventional infrared detection device.

17 is a side sectional view of FIG.

FIG. 18 is a diagram showing deformation of the plate due to rocking vibration.

FIG. 19 is a diagram showing bimetal deformation of a heat conduction block due to temperature change.

[Explanation of symbols]

 1 Lens Unit 2 Dewar 3 Infrared Detector 4 Chassis 5 Compressor 6 Connecting Pipe 7 Compressor Mounting Plate 8 Cold Finger 9 Heat Conduction Block 10 Fan 11 Cover 12 Cooling Air 13 Vertical Vibration 14 Rocking Vibration 15 Cold Finger Heat Conductive Grease 16 Chassis heat transfer grease 17 O-ring 18 Axisymmetric cylindrical Dewar holder 19 Liquid jacket 20 Thin plate corrugated metal spring 21 Flat braided wire conductive material 22 Bimetal deformation 23 Fin block 24 Fin cover 25 First heat pipe 26 Second Heat pipe 27 electronic cooling element 28 first electronic cooling element 29 second electronic cooling element 30 electronic cooling element having fins 31 temperature sensor 32 dewar holder supporting three points 3 3 nitrogen gas

Claims (10)

[Claims] 1. A lens unit, a cylindrical dewar arranged on the same axis as the lens unit and having an infrared detecting element therein, and an engaging portion for engaging the lens unit on the front surface, An axially symmetric cylindrical dewar holder for mounting the dewar on the opposite side of the engaging portion with the unit, a chassis having a mating surface with the lens unit on the front surface thereof, a compressor for cooling the dewar, and A connecting pipe that supplies the refrigerant from the compressor to the dewar, and a recess for mounting the compressor on one side of the connecting pipe, and a radiation fin on the other side, which is arranged to be fixed to the rear surface of the chassis. Compressor mounting plate and cold fingers on the opposite side of the Dewar infrared detector, one of which is the above call Mated to the cylindrical surface of the finger,
The other has a heat conduction block that engages with the bottom surface of the chassis, a flexible member disposed on the mating surface portion of the cold fingers and the heat conduction block, and outside the compressor mounting plate. An infrared detecting device comprising: a fan for cooling the compressor, which is sealed by a compressor mounting plate; and a cover arranged so as to enclose the fan and the heat radiation fin of the compressor mounting plate. 2. The infrared detecting device according to claim 1, wherein a liquid jacket, a thin plate wave type metal spring, or a flat braided wire type conductive material is used as the flexible member. 3. The infrared detecting device according to claim 1, wherein an O-ring is used as the flexible member, and a heat conducting grease is applied to a mating portion between the cold finger and the heat conducting block. apparatus. 4. A lens unit, a cylindrical dewar arranged on the same axis as the lens unit and having an infrared ray detecting element therein, and a fitting portion for fitting the lens unit on the front surface of the lens unit. An axially symmetric cylindrical dewar holder for mounting the dewar on the axial center on the surface opposite to the mating portion with the unit, a chassis having an engaging portion for engaging the lens unit on the front surface thereof, and a fin having a fin on the lower outer surface, A compressor that cools the dewar and engages with the inner surface of the lower part of the case, a connecting pipe that supplies the refrigerant from the compressor to the dewar, a cold finger arranged on the opposite surface of the infrared detection element of the dewar, and the cold. A cylindrical fin block that engages with the cylindrical surface of the fingers and engages with the Dewar holder A cover having fins on its surface, a nitrogen gas sealed in the sealed chassis, and a fan for cooling the mounted components by stirring the nitrogen gas inside the chassis. Infrared detector. 5. A first heat pipe, one of which engages with the fin block and the other of which engages with an inner surface of the upper chassis, and one of which engages with an inner surface of a lower chassis near the compressor and the other of the chassis. The infrared detection device according to claim 4, further comprising a second heat pipe engaged with the inner surface of the upper portion. 6. A first heat pipe, one of which engages with the fin block and the other of which engages with an inner surface of a cover having fins on the outer surface, and one of which engages with the compressor and the other with the outer surface. The infrared detection device according to claim 4, further comprising a second heat pipe engaged with an inner surface of the cover having the fins. 7. An electronic cooling element that engages with an inner surface of a cover having fins on the outer surface, a first heat pipe that engages one of the fin blocks and the other with the electronic cooling element, and one of The infrared detecting apparatus according to claim 4, further comprising a second heat pipe that engages with the compressor and the other engages with the electronic cooling element. 8. A first electronic cooling element engaged with the fin block, a second electronic cooling element engaged with the compressor, one of which is engaged with the first electronic cooling element, and the other of which is engaged with the other. A first heat pipe engaging the inner surface of the cover having fins on the outer surface, and a second heat pipe engaging one of the second electronic cooling elements and the other engaging the inner surface of the cover having fins on the outer surface. The infrared detecting device according to claim 4, further comprising a heat pipe. 9. An electronic cooling element having fins engaging with the inner surface of the chassis, temperature sensors provided on the outer surface and the inner surface of the chassis, and means for driving and controlling the electronic cooling element based on the output of the temperature sensor. The infrared detector according to claim 4, further comprising: 10. The front surface has a fitting portion with the lens unit, columns are arranged on the circumference at 120 ° intervals around an axis, and the dewar is provided on the surface opposite to the fitting portion with the lens unit. 5. The infrared detection device according to claim 4, further comprising: a dewar holder that supports three points around the shaft and an electronic cooling element having a fin that engages with the column.