The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 1978
Filed:
Nov. 10, 1976
Lionel R Baker, Orpington, GB;
Tadeusz Wojtowicz, London, GB;
National Research Development Corporation, London, GB;
Abstract
Optical test apparatus and method for testing various parameters of a lens system such as a T.V. lens system. A single apparatus may be used for testing the modulation transfer function, glare, spectral transmission, relative field illuminance, transverse color, T stop, and back focal distance. The apparatus comprises a pin hole light source and an analyzer means in which the lens may be mounted including a set of screens carrying varying patterns for measuring different parameters. The light transmitted through the screens is measured by a light detector means and the output signal is analyzed to provide a measurement of the parameters.