Optical pickup

Details Optical pickup Optical pickup

2005-03-17

2008-11-18

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

07453787

ABSTRACT:
An optical pickup projects laser beams having the first to the third wavelengths, in response to the type of a recording medium which is an object to which recording or reproduction is to be performed, and reflecting light from the recording medium is received by a light-detecting element. In order to reduce the sizes of the optical pickup, light of the second and the third wavelengths is generated by a single dual-wavelength light source, and reflecting light of all the wavelengths is to be received by the single light-detecting element. A hologram element giving different optical effects to light of each wavelength is arranged between the light irradiating means and the light-detecting element. Thus, appropriate information recording and reproduction can be performed by using light of each wavelength.

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patent: 7106682 (2006-09-01), Ueyama et al.
patent: 7330292 (2008-02-01), Komma
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patent: 2003-45048 (2003-02-01), None
patent: 2003-177226 (2003-06-01), None
patent: 2004-213854 (2004-07-01), None
patent: WO 03/075267 (2003-09-01), None

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