Optical pickup device, information reproduction/recording...

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

Reexamination Certificate

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Details

C369S044410

Reexamination Certificate

active

11331202

ABSTRACT:
The present invention provides an optical pickup device that is resistant to noise in a signal or an RF signal outputted from each light receiving member. Current signals outputted from the light receiving members are converted into voltage signals by I/V converters. The voltage signals are then added up by an adder, and then the added voltage signal is attenuated by an attenuator, so as to obtain an RF signal having the same signal level as the voltage signal outputted from each I/V converter. The RF signal is then transmitted from the optical pickup device to a circuit substrate through a signal line.

REFERENCES:
patent: 4831613 (1989-05-01), Kanda
patent: 6154426 (2000-11-01), Kadowaki
patent: 6222804 (2001-04-01), Yoshizawa
patent: 6282158 (2001-08-01), Kuroiwa
patent: 63-183625 (1988-07-01), None
patent: 01-268303 (1989-10-01), None
patent: 02-299306 (1990-12-01), None
patent: 05-174387 (1993-07-01), None
patent: 06-333291 (1994-12-01), None
patent: 07-037329 (1995-02-01), None
patent: 11-162003 (1999-06-01), None
patent: 11-306680 (1999-11-01), None

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