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Phone : 86-21-58817880 Fax : 86-21-58817881
Email: sale5@winvow.com
The openness of following case has been allowed by our clients with exception of key parameters, which is only 90% of complete design process.
I.Application
To measure the thread profile accurately.
II. Requirements
Applicable wavelength: 500 ~ 600 nm
Magnification: 20 x
Lens quantity: no more than 6 pieces
Lens maximum diameter: less than 35 mm
Lens facial form: all spherical
Lens material: optical glass
Projection distance: 1 m
Biggest diameter:50 mm
Distance between tested object and first lens: 50~ 70 mm
F No: F / 2.8
Maximum distortion: less than 0.5%
Resolution ( tested object) : more than 60lp/mm@0.3
III. Features
It shall design object side telecentric system, namely the pupil is located in infinity. The characteristics of image beam is that the chief ray of incident beam is parallel with optical axial. Therefore, there will be no measuring error when there is positional deviation for the tested object( within deep scope). Since the projection distance is far bigger than back intercept, so when we use optical softwares to design, make projection screen as an object while determinand as image. Since it is a measuring system, distortion demanding level is comparatively hihger than normal objective lens.
IV. Result
