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:
Jun. 23, 1992
Filed:
May. 22, 1990
Catherine Antier, Issy Les Moulineaux, FR;
Jean-Blaise Migozzi, Orsay, FR;
Thomson CSF, Paris, FR;
Abstract
The visor makes it possible to obtain in binocular vision a large field of 60.degree. in the vertical plane and 120.degree. in the horizontal plane. In the case of each monocular vision channel, the visor is constituted by: an image generator such as a miniature cathode-ray tube, for example; an optical relay device; a collimation and combination optical system in which are grouped together a holographic mixing plate for transmitting the landscape channel and reflecting the image channel and a biconvex combining device formed by two holographic spherical optical elements employed on the axis for transmitting the two channels with collimation by diffraction of the image channel. A circular axial zone of zero photometric efficiency is produced in the case of each monocular vision channel and compensated by overlapping of the fields in binocular vision and, in a complementary manner, by the construction of mirror holograms providing variable index modulation.