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Off-axis reflection optical lens focus detection method

An optical lens, off-axis reflection technology, applied in the field of optical inspection

Inactive Publication Date: 2008-04-30
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the defective that existing technology exists, the purpose of the present invention is in order to solve the testing problem of focal length of off-axis reflective optical lens

Method used

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  • Off-axis reflection optical lens focus detection method
  • Off-axis reflection optical lens focus detection method
  • Off-axis reflection optical lens focus detection method

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Experimental program
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Embodiment Construction

[0016] The present invention implements according to the technical scheme that solves technical problem. Before the test, the reflective optical lens 8 to be tested should be placed in the optical testing laboratory at a constant temperature for 24 hours to balance the temperature of the lens. During the test, the reticle 7 of suitable line width and spacing is selected according to the design focal length of the lens to be checked and the detection accuracy, which is conducive to the improvement of theodolite 9 aiming accuracy, and the reticle material generally adopts optical glass; 0.5″ or 2″ theodolite, determined by the focal length test accuracy requirements; the adjustment tooling 10 should be adjustable and stable; the optical platform 11 should have an array foundation to avoid the influence of vibration; To improve the aiming accuracy, the method of aiming at the front and back mirrors and taking the average value is adopted; the test should be carried out in an opti...

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Abstract

The invention relates to a focus inspection method of abaxial reflective optical lens, which belongs to an inspection method in the technical field of optical inspection. The technical problem needed to be solved aims at providing the focus inspection method of abaxial reflective optical lens. The invention has the technical proposal that: firstly, an abaxial reflective optical lens measuring system is built; secondly, the measuring device is debugged; thirdly, the measuring is acted, a theodolite is rotated to respectively aim at the divided images of A and B with an angle difference of 2 omega; and fourthly, data processing is acted: the focus of the measured lens is obtained through the formulae of f=(y / tg omega)*cos alpha. The invention solves the measurement on focus of abaxial reflective optical lens. The invention is also suitable to be used for inspection on other abaxial optical systems.

Description

Technical field: [0001] The invention belongs to the technical field of optical inspection and relates to an inspection method for the focal length of an off-axis reflection optical lens. Background technique: [0002] The general coaxial reflective optical system has two serious disadvantages: one is that there is an inevitable central occlusion; the other is that the field of view with excellent image quality is small. In order to solve the central occlusion, the common method is to take part of the coaxial reflective optical system to avoid the central occlusion, which we call the off-axis reflective optical system. The schematic diagram of the optical path principle of the off-axis reflective optical system is shown in figure 1 , the light is reflected along the visual axis 1 through the primary mirror 2 to the secondary mirror 3, then reflected by the secondary mirror 3 to the third mirror 4, and finally reflected by the third mirror 4 to the image surface 5, the optic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02G01M11/00
Inventor 吴国栋
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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