Apparatus for reading a record carrier on which information is r

Details Apparatus for reading a record carrier on which information is r Apparatus for reading a record carrier on which information is r

1974-12-24

1976-05-11

Cardillo, Jr., Raymond F.

Telegraphy

Systems

Simplex-reversing periodic

178 66DD, 178 67A, 1791003V, 17910041L, H04N 576

Patent

active

039565823

ABSTRACT:
An apparatus for reading a record carrier on which information is recorded in at least one track is described. By illuminating the record carrier with a spot of light which is greater than the width of the track and by inserting in the path of the radiation from the record carrier to the detection system a limiting aperture such that at the wavelength of the radiation employed no details smaller than the width of the track are imaged on the detection system a simple and cheap arrangement may be used.

REFERENCES:
patent: 3534166 (1970-10-01), Korpel
patent: 3567855 (1971-03-01), Hamish
patent: 3688025 (1972-08-01), Whittlemore

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