Invention Grant
US06366548B1 Optical pickup having two laser beam sources having wave lengths different from each other and optical device including the optical pickup
有权
具有具有彼此不同的波长的两个激光束源的光学拾取器和包括光学拾取器的光学装置
- Patent Title: Optical pickup having two laser beam sources having wave lengths different from each other and optical device including the optical pickup
- Patent Title (中): 具有具有彼此不同的波长的两个激光束源的光学拾取器和包括光学拾取器的光学装置
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Application No.: US09420189Application Date: 1999-10-18
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Publication No.: US06366548B1Publication Date: 2002-04-02
- Inventor: Minoru Ohyama
- Applicant: Minoru Ohyama
- Priority: JP10-297400 19981019
- Main IPC: G11B700
- IPC: G11B700
Abstract:
An optical pickup of this invention includes a first laser beam source having a wave length of 780 nm and a second laser beam source having a second wave length of 650 nm wherein the first laser beam source and the second laser beam source are disposed in the vicinity of each other, emission lights from the first laser beam source and the second laser beam source are emitted along substantially the same optical axis and a reflected light from the information recording medium is returned along the optical axis; the first diffraction grating, the second diffraction grating and the light receiving device substrate are disposed in order, the first diffraction grating is substantially transparent for a wave length of 780 nm and diffracts a wave length of 650 nm, and the second diffraction grating is substantially transparent for a wave length of 650 nm while it diffracts a wave length of 780 nm.
Information query
