Dust proof optical system for optically reading and writing on a

Details Dust proof optical system for optically reading and writing on a Dust proof optical system for optically reading and writing on a

1976-08-18

1978-08-08

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 350 61, H04N 576, G11B 712

Patent

active

041060571

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.

REFERENCES:
patent: 3539710 (1970-11-01), Cross et al.
patent: 3839601 (1974-10-01), Kimura
patent: 3977684 (1976-08-01), Camerik
patent: 4001892 (1977-01-01), Castelli et al.
patent: 4021101 (1977-05-01), Camerik
Kramer et al., The Philips `ULP` System, Philips Tech. Rev., 33 No. 7, 1973, pp. 178-180.

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