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Optical-disc-recording-apparatus-with-a-light-beam-having-a-controllable-quantity

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Optical disc recording apparatus with a light beam having a controllable quantity

Details

Inventors: Mashimo, Akira;
Assignee: Teac Corporation (JP)
Primary Examiner: Cardillo; Raymond F.
Assistant Examiner: Young; W. R.
Attorney, Agent or Firm: Ladas & Parry

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.

DETAILED DESCRIPTION Accordingly, it is a general object of the present invention to provide a novel and useful optical disc recording apparatus in which the problems described heretofore are eliminated.
Another and more specific object of the present invention is to provide an optical disc recording apparatus comprising detecting means for detecting a quantity of light of a recording light beam and closed loop means for controlling the quantity of light of the recording light beam based on a detection output of the detecting means.
According to the optical disc recording apparatus of the present invention, it is possible to satisfactorily record an information signal on an optical disc for the entire recording region thereof.
Other objects and further features of the present invention will be apparent from the following detailed description when read in conjunction with the accompanying drawings.

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