Optical pickup device

Details Optical pickup device Optical pickup device

2008-04-08

2008-04-08

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S103000

Reexamination Certificate

active

10635528

ABSTRACT:
Substantially all of the laser light emitted from laser chip(s)11toward optical disk(s)17may be transmitted through polarizing hologram(s)13and may thereafter be transmitted through quarter-wave plate(s)15,and after being reflected at optical disk(s)17,may again be transmitted through quarter-wave plate(s)15and be incident on polarizing hologram(s)13. Accordingly, where laser light is transmitted twice through quarter-wave plate(s)15,the direction(s) of polarization thereof may be rotated by 90 degrees before it is incident on polarizing hologram(s)13.For this reason, even if laser light is p-polarized when it is transmitted through polarizing hologram(s)13from laser chip(s)11,it may be s-polarized when it is again transmitted through polarizing hologram(s)13after being reflected from optical disk(s)17.Laser light, after being made s-polarized, may be diffracted by polarizing hologram(s)13,which diffracts only s-polarized light. Light of order ±1 produced as a result of diffraction of laser light by polarizing hologram(s)13may be incident on photodiode(s)18.

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