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US 2004/0172643 A1Published application
Optical head device, optical disk apparatus using optical head device, and heat radiation mechanism
AssigneeKabushiki Kaisha Toshiba
InventorHiroshi Shinozuka
Life of this patent
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Abstract
The invention provides an optical head device and an optical disk apparatus in which characteristics are not changed even if the temperature changes. Change in light-emitting characteristics caused by heat generation is suppressed by connecting a pin of a semiconductor laser element to a land for heat radiation at a connecting area.
Claims16
An optical head device comprising:
- a light source which emits a light beam;
- a connecting portion which can supply at least an actuating signal or driving current to the light source;
- and
- a heat radiating element which is connected to the connecting portion, and is connected to a predetermined area of a circuit board that supplies the actuating signal or the driving current to diffuse heat generated from the light source.
1 more element
An optical head device comprising:
- a light source which emits a light beam;
- a connecting portion which can supply at least an actuating signal or driving current to the light source;
- a heat sink which diffuses heat from the light source;
- a heat radiating element which is connected to the connecting unit, and is connected to a predetermined area of a circuit board that supplies the actuating signal or the driving current to diffuse heat generated from the light source;
- and
- an objective lens which focuses the light beam from the light source onto a recording surface of an information recording medium in which information is recorded.
3 more elements
An optical disk apparatus comprising:
- an optical head device including:
- a light source which emits a light beam;
- a connecting portion which can supply at least an actuating signal or driving current to the light source;
- and
- a heat radiating element which is connected to the connecting unit, and is connected to a predetermined area of a circuit board that supplies the actuating signal or the driving current to diffuse heat generated from the light source;
- and
- an information processing circuit which reproduces information recorded in a recording medium on the basis of an electric signal outputted from a photodetector of the optical head device.
4 more elements
A heat radiation mechanism comprising:
- a heat source which generates heat by being supplied with an actuating signal or driving current;
- a circuit board which provides at least the actuating signal or the driving current to the heat source;
- a connecting portion which connects the heat source to the circuit board while electrical continuity is secured;
- a heat sink which diffuses heat generated by the heat source;
- and
- a heat radiating element which includes a portion having a large area or a large volume which is connected to or in contact with the connecting portion and diffuses head generated by the heat source.
3 more elements
Dependencies are inferred from the claim text.