Double-sided telecentric measurement objective

Details Double-sided telecentric measurement objective Double-sided telecentric measurement objective

1996-06-03

1998-01-13

Nguyen, Thong

Optical: systems and elements

Lens

Telecentric system

359362, 359658, 359756, G02B 1322, G02B 2102

Patent

active

057085323

ABSTRACT:
A double sided telecentic measurement objective for contactless length measurement in two-dimensional and three-dimensional space. The objective has an image-side optical system consisting of three elements equivalent to those of an object-side optical system but in the reverse order, including a cemented positively refracting lens element turned toward the object of image respectively, a collecting lens spaced by an air gap from the cemented lens, and a dispersive meniscus spaced by an air gap from the collecting lens. The widths of the air gaps between the collecting lenses and the meniscus are substantially greater than the widths of air gaps between the cemented lens elements and the collecting lenses.

REFERENCES:
patent: 4189211 (1980-02-01), Taylor
Abstract of SU 909,652; Soviet Inventions Illustrated, Week K01, issued 16 Feb. 1983 Derwent Publications Ltd, London, G.B.
Patent Abstracts of Japan, No. 4-042208, vol. 16, No. 218 (P-1357) Dainippon Screen Mfg Co Ltd, Inventor: Hayashi Naohisa.

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