Apparatus for controlling relative movement of an optical head t

Details Apparatus for controlling relative movement of an optical head t Apparatus for controlling relative movement of an optical head t

1986-05-14

1988-11-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 44, G01J 120

Patent

active

047884215

ABSTRACT:
A control apparatus comprises a linear actuator (49) which moves an optical head (37) having a photo detector (45) in a radial direction of an optical disk (33), a velocity detection circuit (57) which detects relative moving velocity of the optical head (37) to the optical disk (33) during track accessing, and a linear actuator drive control circuit (50) which controls the actuator (49) in response to the detected velocity. The velocity detection circuit (57) generates a digital signal which corresponds to a cycle of an RF output signal of the photo detector (45) and, in response to this digital signal, it further generates an analog signal, which corresponds to the inverse of the cycle of the RF signal, to be outputted as the relative moving velocity of the optical head (37).

REFERENCES:
patent: 4513406 (1985-04-01), Ishihara
patent: 4545003 (1985-10-01), Hirano et al.
patent: 4607358 (1986-08-01), Maeda et al.
patent: 4615023 (1986-09-01), Inada et al.
patent: 4677602 (1987-06-01), Okano et al.
"Optical video recorder using tellurium sub-oxide thin film disk", Tomio Yoshida et al., SPIE vol. 329 Optical Disk Technology (1982, pp. 40-45).
"Optical disk memory system", Teruo Murakami et al., SPIE vol. 329 Optical Disk Technology (1982), pp. 25-32).

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