G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1, 352/32
G11B 7/00 (2006.01) G11B 7/0037 (2006.01) G11B 7/12 (2006.01)
Patent
CA 1183257
14 ABSTRACT: By means of a radiation beam an apparatus writes or reads information on an information surface of a rotary optical information disc, which apparatus comprises an objective frame on which an objective for concentrating the radiation beam to form a radiation spot is mounted by means of a parallel guide in such a way that it can move along its optical axis. The objective is protected against dust, contaminants and mechanical damage by means of stationary plane-parallel, radiation-beam-transmissive shielding means which are interposed between the objective and the rotary information disc, the lens system of the objective being corrected for the optical properties of the shielding means.
382926
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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