Focus error detector and optical head using the same

Details Focus error detector and optical head using the same Focus error detector and optical head using the same

1985-06-14

1987-08-25

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120, G11B 509

Patent

active

046894810

ABSTRACT:
A focus error detector for an optical head utilizes a transmission type diffraction grating and an optical system for converging a beam issuing from a light source onto an object and converting light reflected from the object to a collimated beam to cause the collimated beam to become incident to the diffraction grating at a proper angle of incidence. A photodetector having a plurality of light-sensitive sections, is positioned relative to the grating such that it receives rays diffracted substantially from the grating in the direction of reflection of the diffraction grating. Photodetector data are used to calculate focus correction signals which are supplied to servo-mechanisms providing physical adjustments to the optical system.

REFERENCES:
patent: 3781110 (1973-12-01), Leitz et al.
patent: 3833769 (1974-09-01), Compaan et al.
patent: 4462095 (1984-07-01), Chen

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