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. 08, 1978
Filed:
Aug. 18, 1976
Petrus A Van Vroenhoven, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
Apparatus for optically reading and/or recording information on a rotary record with the aid of a radiation beam, in particular a video player, in which a carriage which is movable to and fro underneath a deck and carries a focussing device with an objective, as well as a number of other optical elements belonging to a scanning device and, as the case may be, a radiation source for producing the radiation beam. In order to prevent dust and other air-borne contaminations from settling on the optical faces of the optical elements of the scanning unit, at least a number and preferably all optical elements are protected against dust by a dust cover. If required, a completely dust-proof enclosure of the optical elements and the part of the radiation source from which the radiation beam emerges may be employed, the electrical connections to the electrical equipment located inside the enclosure being made via dust-proof passages and furthermore the objective being guided in a dust-proof manner in a parallel guide system, while the dust cover adjoins the carriage and, if desired, the radiation source with the aid of dust-strips.