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:
Sep. 13, 1988
Filed:
Oct. 27, 1986
Claude E Hily, Ozouer-le-Voulgis, FR;
Guy N Martin, Noiseau, FR;
U.S. Philips Corp., New York, NY (US);
Abstract
Optical viewing or projection device, comprising at least two objectives (L.sub.1 L.sub.2) whose optical axes (x.sub.1 x'.sub.1 ; x.sub.2 x'.sub.2) are parallel to a general axis of symmetry (xx') of the device, endowed with a focusing system permitting the formation of images or viewing in a fixed reference plane (P'.sub.0), by means of simultaneous translation of the objectives in parallel to the general axis of symmetry, and comprising means for reducing the parallax produced by the objectives, the means for reducing the parallax including a system of parallel-faced plates (M.sub.1 M.sub.2) which has the general axis of symmetry (xx') of the optical device as its axis of symmetry, wherein a parallel-faced plate is placed between each objective (L.sub.1, L.sub.2) and the fixed reference plane (P'.sub.0) and wherein each plate is inclined to the optical axis of the objective to which it is applied at an angle determined as a function of the thickness and of the refractive index of the material of the plate, and as a function of the focal lengths and of the distance between objectives, to produce a constant transverse offset of the points in the fixed reference plane which are conjugates of the points of the general axis of symmetry of the device, whatever the position of these points on this axis, the means for reducing the parallax additionally include a system (10, 11, 12, 3, 4) permit correlation of the rotation of the parallel-faced plates with a system for focusing the objectives.