Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1987-04-08
1989-03-14
Cardillo, Raymond F.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 54, 369 55, 369106, 372 29, G11B 700, H01S 313
Patent
active
048130346
ABSTRACT:
An optical disc recording apparatus comprises a light generating source for generating a recording light beam, an open loop circuit for controlling an amplitude of an angular modulated information signal responsive to a power setting signal indicative of a radial position of the recording light beam on the optical disc, a detector circuit for detecting a quantity of light of the recording light beam and for producing a D.C. signal within an output detection signal which is obtained by subjecting the detected quantity of light to a photoelectric conversion, a control circuit for variably controlling a level of the D.C. signal from the detecting circuit depending on the radial position of the recording light beam on the optical disc and according to a preset characteristic, and an adder for adding an output D.C. signal level of the control circuit and an output signal of the open loop circuit and for supplying an added signal to the light generating source so as to control a quantity of light of the recording light beam generated thereby. The D.C. signal from the detecting circuit is controlled by a closed loop circuit comprising the detecting circuit, the control circuit and the adder.
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Cardillo Raymond F.
Teac Corporation
Young W. R.
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