Method and device for measuring center thickness of post-pupil laser differential confocal lens
A differential confocal and lens center technology, applied in measuring devices, optical devices, instruments, etc., can solve problems such as unsatisfactory high-precision testing of spherical lens center thickness, achieve high-precision calculations, reduce measurement errors, and improve The effect of measurement accuracy
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Embodiment 1
[0053] Such as Figure 4 As shown, the post-pupil laser differential confocal lens center thickness measurement device includes a laser 22, an optical fiber 23 and a point light source 1, which are sequentially placed in the beam splitter 2, collimating lens 4 and converging The lens 5 also includes a D-shaped rear pupil 7 placed in the reflection direction of the beam splitter 2 and a split-pupil differential confocal detection system 11 composed of a microscope objective lens 20 and a CCD 21; a main control computer 24 and a motor drive system 25 connected so that it drives the lens under test 6 to scan along the optical axis on the linear guide rail 26 .
[0054] When the device is used to measure the focal length of the lens, the split-pupil differential confocal detection system 11 in the system is used to locate the vertex position of the front surface and the vertex position of the rear surface of the measured lens 6 with high precision, and then measure its central thi...
Embodiment 2
[0067] The measurement steps in this embodiment are the same as in Embodiment 1, as Figure 5 Shown is the center measurement device diagram of the rear split-pupil laser differential confocal lens in this embodiment, Figure 4 The D-shaped rear pupil 7 in is replaced by the circular rear pupil 30 here.
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