Optical disc apparatus
AssigneeFunai Electric Co., Ltd.
InventorsTakashi Yasuda, Yutaka Kamimori
Life of this patent
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Abstract
An optical disc apparatus includes: a pickup head including light sources for irradiating laser beams onto each of the two types of optical discs set in the unit main body and photodetectors for detecting the reflected light amount from the optical disc; and a control unit for permitting one light source of the pickup head to irradiate light source and inhibiting the other light source of the pickup head from irradiating light source in accordance with the type of an optical disc set in the unit main body, wherein the pickup head has a monitoring photodetector for detecting the light amount of laser beams irradiated from the each light source and a monitoring output selector for selectively inputting the output of the monitoring photodetector to the control unit.
Claims5
An optical disc apparatus comprising:
- a pickup head including light sources for irradiating laser beams onto each of the two types of optical discs set in the unit main body and photodetectors for detecting the reflected light amount from the optical disc;
- and
- a control unit for permitting one light source of the pickup head to irradiate light source and inhibiting the other light source of the pickup head from irradiating light source in accordance with the type of an optical disc set in the unit main body, wherein:
- the pickup head has a monitoring photodetector for detecting the light amount of laser beams irradiated from the each light source and a monitoring output selector for selectively inputting the output of the monitoring photodetector to the control unit;
- one of the two light sources is for CDs and the other is for DVDs;
- when the control unit permits one light source to irradiate laser beams, the monitoring output selector inputs the output of the monitoring photodetector corresponding to the one light source to the control unit and, when the control unit does not permit one light source to irradiate laser beams, the monitoring output selector inputs the output of the monitoring photodetector corresponding to the other light source to the control unit;
- the control unit individually gives the pickup head a signal indicating permission or inhibition of laser beams to two light sources;
- and
- the pickup head has a drive part common to two light sources and a drive selector for selecting a light source driven by the drive part and the drive selector selectively drives a light source permitted to irradiate light source by the control unit.
An optical disc apparatus comprising:
- a pickup head including light sources for irradiating laser beams onto each of the two types of optical discs set in the unit main body and photodetectors for detecting the reflected light amount from the optical disc;
- and
- a control unit for permitting one light source of the pickup head to irradiate light source and inhibiting the other light source of the pickup head from irradiating light source in accordance with the type of an optical disc set in the unit main body, wherein
- the pickup head has a monitoring photodetector for detecting the light amount of laser beams irradiated from the each light source and a monitoring output selector for selectively inputting the output of the monitoring photodetector to the control unit;
- and
- when the control unit permits one light source to irradiate laser beams, the monitoring output selector inputs the output of the monitoring photodetector corresponding to the one light source to the control unit and, when the control unit does not permit one light source to irradiate laser beams, the monitoring output selector inputs the output of the monitoring photodetector corresponding to the other light source to the control unit.
Dependencies are inferred from the claim text.