Polarizing diffraction element and optical head device

Details Polarizing diffraction element and optical head device Polarizing diffraction element and optical head device

2006-06-26

2010-06-15

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112170, C369S112190

Reexamination Certificate

active

07738346

ABSTRACT:
A polarizing diffraction element having a wavelength selectivity which functions as a polarizing diffraction element at a wavelength λ1, and which does not function as a diffraction grating not depending on incident polarization state and shows high transmittance at a wavelength λ2, and an optical head device employing the element, are provided.The polarizing diffraction element selectively diffracts or transmits incident light having two different wavelengths each containing a first circularly polarized light and a second circularly polarized light having a rotation opposite from the rotation of the first circularly polarized light, depending on wavelength and polarization state of the incident light. Then, a reflective wavelength region for at least the first circularly incident light, does not contain said two incident wavelengths.

REFERENCES:
patent: 5739952 (1998-04-01), Takeda et al.
patent: 5822029 (1998-10-01), Davis et al.
patent: 6366548 (2002-04-01), Ohyama
patent: 6678078 (2004-01-01), Popovich et al.
patent: 7106402 (2006-09-01), Suzuki et al.
patent: 2002/0110651 (2002-08-01), Suzushi
patent: 2003/0123371 (2003-07-01), Nishiyama et al.
patent: 2001-83311 (2001-03-01), None
patent: 2001-133627 (2001-05-01), None
patent: 2001-174614 (2001-06-01), None
patent: 2002-14213 (2002-01-01), None
Chandrasekhar, “Liquid Crystals,” Second Edition, Cambridge University Press, Chap. 4, Fig. 4. 1,6, pp. 260-265.
Hirotsugu Kikuchi, et al. “Polymer-Stabilized Liquid Crystal Blue Phases,” Macmillan Press, vol. 1, No. 1, Sep. 2002, pp. 64-68.
U.S. Appl. No. 11/627,720, filed Jan. 26, 2007, Sato.
U.S. Appl. No. 12/195,889, filed Aug. 21, 2008, Sato, et al.

Affiliated with

Also associated with

Rating

Polarizing diffraction element and optical head device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polarizing diffraction element and optical head device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polarizing diffraction element and optical head device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4175618