Telecentric variable magnification optical system for video base

Details Telecentric variable magnification optical system for video base Telecentric variable magnification optical system for video base

1995-04-03

1996-06-04

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

2502015, 359363, G01N 2186

Patent

active

055235832

ABSTRACT:
A video camera and a set of telecentric imaging lenses are mounted in spaced relation on a reciprocable support for movement in unison by the support toward and away from a workpiece to focus its magnified image, which is projected by the imaging lenses to the camera for recording and display thereby. The imaging lenses are fixed to the support, but the camera is mounted for limited movement on the support toward and away from the fixed lenses to vary the magnification of the projected image. An iris diaphragm is secured to the support between the camera and the lenses and has an adjusting ring connected to the video camera for movement thereby upon adjustment of the camera relative to the support, thereby to alter the diameter of the opening in the iris diaphragm in response to camera movement on the support.

REFERENCES:
patent: 4208089 (1980-06-01), Netto
patent: 5461228 (1995-10-01), Kirkman et al.

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