Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-11-13
2010-12-28
Young, Wayne R (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S044230, C369S112010, C369S122000, C369S112040, C369S112150
Reexamination Certificate
active
07859976
ABSTRACT:
In a photo pickup device, an incident area30for a reflection light of a light spot is divided into four areas30a˜30dby parting lines31, 32making axial-symmetrical angles with a direction Y of a projected track on an optical disc. In these areas, the so-divided areas30a,30care formed so as to diffract the light in one or more directions in a range of 90 degrees±20 degrees to the direction Y and impress misalignment on each diffraction light. In each diffraction light, two focal lines produced due to the astigmatism make approx. 45 degrees with the direction Y of the projected track. Further, the divided areas30b,30dare characterized by diffracting the light in one or more directions in a range of 90 degrees±20 degrees to the direction Y.
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Machine translation of JP application 08063761 by Sakuyama Hiroyuki on Mar. 8, 1996.
Hiraga Takayoshi
Kaneko Takahiro
Ohyama Minoru
Meyer Jerald L.
Nguyen Linh T
Protigal Stanley N.
The Nath Law Group
Victor Company of Japan , Limited
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