Method of aligning light sources in an optical pickup device, and optical pickup and optical disc drive employing the method
AssigneeToshiba Samsung Storage Technology Korea Corporation
InventorsJung-bae OH, Il-boon KO, Ki-bok KIM, Hyun-wook NAM, Eun-goo KIM
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Abstract
Provided is an optical pickup device and a method of aligning a twin-light source in an optical disc drive. The method operates two light emitting chips in the light source simultaneously to cause two laser beams to be transmitted through a grating element at the same time. Location errors and rotation errors of the two light emitting chips with respect to the grating element may be corrected while monitoring the laser beams transmitted through the grating element.
Claims16
A method of aligning a twin-light source and a grating element in an optical pickup device, the method comprising:
- generating two laser beams from two light emitting chips of the twin-light source by supplying an electric current to the two light emitting chips;
- aligning the twin-light source with respect to the grating element while simultaneously monitoring a diffraction status of the two laser beams as they are transmitted through the grating element using an imaging device;
- and
- fixing the grating element and the light source to a base of the optical pickup device, in response to the aligning.
An optical disc drive, comprising:
- an optical pickup device comprising a twin-light source that has two light emitting chips for generating two laser beams, and a grating element for diffracting the two laser beams as they pass through;
- and
- a laser diode drive (LDD) comprising a signal processing unit for processing electric signals emitted from the optical pickup device, and a plurality of output ports for supplying electric currents to the two light emitting chips to control an output of the twin-light source during a simultaneous alignment operation of the two light emitting chips and the grating element.
A method of aligning a twin-light source in an optical disc drive, the method comprising:
- generating two laser beams from two light emitting chips in a twin-light source of an optical pickup of the optical disc drive by supplying an electric current to the two light emitting chips of the twin-light source using a laser diode drive (LDD) provided in the optical disc drive;
- transmitting the two laser beams through a grating element provided in the optical pickup device;
- and
- simultaneously aligning the two light emitting chips of the twin-light source with respect to the grating element while monitoring diffraction states of the two laser beams transmitted through the grating element.
Dependencies are inferred from the claim text.