Title:
ホログラフィックデータストレージに使用するための書き込みヘッド
Document Type and Number:
Japanese Patent JP4795974
Kind Code:
B2
Abstract:
A spatial light modulator (SLM) having a phase mask that is provided as an internal component thereof. The phase mask can be provided as a multilevel surface of relatively higher index of refraction material on an inner surface of a transmissive cover window or as a separate transmissive window between the cover window and the pixels of the SLM. If the phase mask is to be used with a liquid crystal SLM, then it may be desirable to planarize the surface of the cover window contacting the liquid crystal by providing a layer of relatively lower index of refraction material adjacent the multilevel surface. The phase mask can also be provided on the transmissive cover window by patterned ion deposition, exposing patterned light to a photopolymeric material, or in some other suitable fashion. Arranging for the pixel electrodes to be at one of multiple levels rather than lying in an exactly planar relationship can also effectively create the phase mask.
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Inventors:
Handski, Mark A.
O'Callaghan, Michael Jay.
Walker, Christopher M.
O'Callaghan, Michael Jay.
Walker, Christopher M.
Application Number:
JP2006551491A
Publication Date:
October 19, 2011
Filing Date:
January 27, 2005
Export Citation:
Assignee:
Displaytech, Incorporated
International Classes:
G02F1/061; G02F1/13; G02F1/29; G03H1/02; G03H1/16; G11B7/00; G11B7/0065; G11B7/125; G11B7/135; G02F1/1335; G02F1/13363
Domestic Patent References:
| JPH03289692A | 1991-12-19 |
Foreign References:
| US5995251A | 1999-11-30 |
Attorney, Agent or Firm:
Hironobu Onda
Makoto Onda
Makoto Onda