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Title:
LIGHT SOURCE PROTECTING DEVICE AND DISC DEVICE
Document Type and Number:
WIPO Patent Application WO/2006/090740
Kind Code:
A1
Abstract:
A light source protecting device (40) is provided to suppress excessive light emission of a laser diode. The light source protecting device (40) includes a temperature sensor (21) and a resistance variable device (30). In a laser diode (20) which is a light source for irradiating a disc with read light or the like, power is supplied from a power supply (Vcc). A temperature sensor (21) detects an ambient temperature, namely, a use temperature, of a laser diode (20). The resistance variable device (30) changes a limit value of a drive current supplied to a laser diode from the power supply (Vcc) based on the ambient temperature of the laser diode (20) measured by the temperature sensor (21).

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Inventors:
ISHIZUKA KAZUNORI (JP)
Application Number:
PCT/JP2006/303173
Publication Date:
August 31, 2006
Filing Date:
February 22, 2006
Export Citation:
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Assignee:
PIONEER CORP (JP)
ISHIZUKA KAZUNORI (JP)
International Classes:
G11B7/125
Foreign References:
JPH01114091A1989-05-02
JPH07254743A1995-10-03
JPS6168324U1986-05-10
JPS6368121U1988-05-09
Attorney, Agent or Firm:
Sakai, Hiroaki (Kasumigaseki Building 2-5, Kasumigaseki 3-chom, Chiyoda-ku Tokyo 19, JP)
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