Stigmatic optical device and an optical recording head equipped

Details Stigmatic optical device and an optical recording head equipped Stigmatic optical device and an optical recording head equipped

1980-11-18

1982-06-08

Konick, Bernard

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

350446, 357 19, 369112, 369122, G11B 712

Patent

active

043343007

ABSTRACT:
An optical device for forming a stigmatic image of a laser source positioned at a predetermined point is intended to illuminate a reflecting surface while also providing a separation between the beam emerging from the source and the beam reflected from the surface. The device comprises a cube placed against a converging lens, the dimensions of the assembly thus formed being such that the cube face remote from the lens passes through a Weierstrass point of the spherical refracting surface formed by the lens. The laser source is positioned at the Weierstrass point. The cube is formed by two prisms cemented together, the interface being treated so as to have a polarization-separating effect.

REFERENCES:
patent: 3842263 (1974-10-01), Kornrumpf et al.
patent: 3941945 (1976-03-01), Borner et al.
patent: 4193091 (1980-03-01), Kleuters et al.
Journal of Scientific Instruments, vol. 28, Nov. 1951, No. 5 Londres (GB) W. Weinstein et al; "A Beam--Splitter for Non--Collimated Light", pp. 351-352.

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