Optical pickup having radially arranged lenses in a low...

Details Optical pickup having radially arranged lenses in a low... Optical pickup having radially arranged lenses in a low...

2007-02-27

2010-06-08

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S121000

Reexamination Certificate

active

07733760

ABSTRACT:
An optical pickup includes a first source which emits a first beam with a first wavelength; a second source which emits a second beam with a wavelength shorter than the first wavelength; a first collimates lens which collimates the first beam; a second collimate lens which collimates the second beam; a first objective lens which converges the first collimated beam onto an optical disc; and a second objective lens which converges the second collimated beam onto the disc. The first and second objective lenses are arranged in the disc radial direction. The second objective lens is arranged closer to the side of the disc outer circumference than the first objective lens. The first collimate lens is arranged on the right-hand side when the second objective lens is viewed from the first objective lens. The second collimate lens is arranged on the left-hand side when the first objective lens is viewed from the second objective lens. The gap between the first collimate lens and the first objective lens is larger than the gap between the second collimate lens and the second objective lens.

REFERENCES:
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patent: 2005/0007906 (2005-01-01), Horinouchi et al.
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patent: 2006/0285473 (2006-12-01), Kan
patent: 2009/0016178 (2009-01-01), Kim et al.
patent: 2003-281758 (2003-10-01), None
patent: 2006-172610 (2006-06-01), None
Tomohiro Matsuo, et al., “Optical Pickup for BD/DVD/CD Drive with 12.7mm Height”, WPD3, IEEE, 2006.

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