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Off-axis three-reflection type objective used for portable uncooled infrared telescope

An uncooled infrared and telescope technology, applied in the optical field, can solve the problems of small field of view, large volume, large weight, etc., and achieve the effect of easy portability and high imaging quality.

Inactive Publication Date: 2011-10-19
吉林东光精密机械厂 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the disadvantages of large volume, heavy weight, chromatic aberration, small field of view, and large stray light existing in the above-mentioned types of infrared telescopes

Method used

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  • Off-axis three-reflection type objective used for portable uncooled infrared telescope
  • Off-axis three-reflection type objective used for portable uncooled infrared telescope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Referring to the accompanying drawings, it is assumed that the radius of the first reflector 2 is -130mm, the radius of the second reflector 3 is -30mm, and the radius of the third reflector 5 is -40mm. The protective window 1 and the first, second and third reflectors are sequentially installed on the lens barrel. The positional relationship of the components is: the centers of the spheres of the three reflectors are located on a straight line to form the optical axis of the system. The axial distance L1 between the first and second reflectors is 35 mm, the axial distance L2 between the second reflector and the third reflector is 30 mm, and the axial distance L3 between the third reflector 5 and the image plane is 30 mm. The midpoint of the first reflecting mirror 2 is 20mm away from the system optical axis distance D1, the midpoint of the third reflecting mirror 5 is 4mm away from the system optical axis distance D2, and the formed image plane center is 15mm away from...

Embodiment 2

[0013] Let the radius of the first reflector 2 be -500mm; the radius of the second reflector 3 be -130mm; the radius of the third reflector 5 be -160mm. The protective window 1 and the first, second and third reflectors are sequentially installed on the lens barrel. The positional relationship of the components is: the centers of the spheres of the three reflectors are located on a straight line to form the optical axis of the system. The axial distance L1 between the first and second reflectors is 120 mm, the axial distance L2 between the second reflector and the third reflector is 100 mm, and the axial distance L3 between the third reflector 5 and the image plane is 120 mm. The midpoint of the first reflecting mirror 2 is 90mm away from the system optical axis distance D1, the midpoint of the third reflecting mirror 5 is 80mm away from the system optical axis distance D2, and the formed image plane center is 70mm away from the system optical axis distance D3. The focal leng...

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Abstract

The invention discloses an off-axis three-reflection type objective used for a portable uncooled infrared telescope, which is used in an uncooled infrared telescope for overcoming the defects of large size and weight as well as poor image quality of the existing similar infrared telescopes. The off-axis three-reflection type objective used for the portable uncooled infrared telescope comprises a protection window mounted in a telescope cone, a diaphragm and an image sensitive element on an image plane. The off-axis three-reflection type objective used for the portable uncooled infrared telescope is characterized in that an off-axis three-reflection structure consisting of a first reflector, a second reflector and a third reflector is arranged in the telescope cone, wherein the first reflector and the third reflector are concave non-spherical reflectors; the second reflector is a convex non-spherical reflector; the spherical centers of the three reflectors are on the same straight line so as to form a system optical axis; and the middle point of the first reflector deviates the system optical axis, the middle point of the third reflector deviates the system optical axis, and the center of the image plane deviates the system optical axis. The off-axis three-reflection type objective used for the portable uncooled infrared telescope has the beneficial effects that the uncooled infrared telescope formed by the off-axis three-reflection type objective is small in size and light in weight, is convenient to carry, is free of central obscuration and has high imaging quality.

Description

technical field [0001] The invention belongs to the optical technology, in particular to an objective lens for a portable uncooled infrared telescope. Background technique [0002] The existing refrigerated infrared telescope needs to have a cooling system, which makes the volume and weight of the telescope relatively large and inconvenient to carry. The existing uncooled infrared telescope adopts the traditional transmission design method of the telescope. This kind of telescope not only still has a large volume and weight, but also has chromatic aberration and large secondary spectrum, which is not conducive to improving image quality. The existing Cassegrain system, Gregorian system, and R-C system all have central obstruction in the field of view and large stray light, which limits the system design to a large extent. At present, the above several structural forms commonly used in infrared telescopic observation all have the same disadvantages of being inconvenient to c...

Claims

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Application Information

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IPC IPC(8): G02B23/02G02B13/18
Inventor 王英曲国志李英超王陆王跃
Owner 吉林东光精密机械厂
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