Optical information processing apparatus having offset adjusting circuit which can be exchanged together with optical head
AssigneeCanon Kabushiki Kaisha
InventorsYasuo Suzuki, Shigeru Aoi
Life of this patent
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Abstract
An optical information processing apparatus is so constructed that an optical head in the apparatus for recording and/or reproducing information by irradiating a light beam onto a recording medium is exchangeably attached to an apparatus main body, wherein a circuit which compensate for an offset of an electric signal which is output from the optical head, is attached to the apparatus main body so that it can be exchanged together with the optical head, thereby making unnecessary an offset adjustment after the optical head has been exchanged.
Claims17
An optical information processing apparatus comprising:
- a base;
- an optical head detachably attached to said base, said optical head comprising:
- (a) a light source for emitting a light beam;
- (b) an optical system for directing a light beam from said light source to an information recording medium, and for irradiating the information recording medium with a condensed light beam;
- (c) focusing and/or tracking adjusting means for adjusting a focusing and/or tracking condition of the condensed light beam irradiating the information recording medium;
- and
- (d) a detector for detecting light reflected from the information recording medium when irradiated with the condensed light beam, and for producing an output signal;
- an adjusting circuit, detachably attached to said base, for adjusting an offset of the output signal produced by said detector;
- and
- a signal processing circuit attached to said base, said signal processing circuit comprising at least one control circuit capable of being electrically connected to said adjusting circuit through a connector, and comprising means for controlling said focusing and/or tracking adjusting means in accordance with the output signal produced by said detector and received through said adjusting circuit.
An optical head unit for use in an optical information processing apparatus, said optical head unit comprising:
- a light source for emitting a light beam;
- an optical system for directing a light beam from said light source to an information recording medium, and for irradiating the information recording medium with a condensed light beam;
- focusing and/or tracking adjusting means for adjusting a focusing and/or tracking condition of the condensed light beam irradiating the information recording medium;
- a photodetector for detecting light reflected from the information recording medium when irradiated with the condensed light beam, and for producing an output signal;
- an adjusting circuit for adjusting an offset of the output signal produced by said photodetector;
- and
- a connector terminal for electrically connecting a signal processing circuit mounted on a main body of said optical information processing apparatus, said signal processing circuit comprising a control circuit for controlling said focusing and/or tracking adjusting means in accordance with the output signal produced by said photodetector and received through said adjusting circuit.
An optical information processing apparatus in which an optical head, for recording information on and/or reproducing information from a recording medium by applying a light beam to the recording medium, is detachably attached to a main body of the apparatus,
- characterized in that an adjusting circuit, for adjusting an offset of an electrical signal output from said optical head, is detachably attached to the main body of the apparatus together with said optical head so that said optical head is capable of being replaced free of offset adjustment of the electrical signal output from said optical head.
An optical information processing apparatus, comprising:
- a base;
- a light source detachably attached to said base, for emitting a light beam;
- an optical system for directing a light beam from said light source to an information recording medium, and for irradiating the information recording medium with a condensed light beam;
- focusing and/or tracking adjusting means for adjusting a focusing and/or tracking condition of the condensed light beam irradiating the information recording medium;
- a photodetector detachably attached to said base, for detecting light reflected from the information recording medium when irradiated with the condensed light beam, and for producing an output signal;
- an adjusting circuit, detachably attached to said base, for adjusting an offset of the output signal produced by said photodetector;
- and
- a signal processing circuit attached to said base, said signal processing circuit capable of being electrically connected to said adjusting circuit through a connector, and comprising a control circuit for controlling said focusing and/or tracking adjusting means in accordance with the output signal produced by said photodetector and received through said adjusting circuit.
Dependencies are inferred from the claim text.