Title:
HOLOGRAM TYPE REPRODUCING DEVICE
Document Type and Number:
WIPO Patent Application WO/2006/132198
Kind Code:
A1
Abstract:
A hologram type reproducing device which suppresses aberration and is suitable for reducing the sizes of an optical system as a whole. When a positive meniscus lens is used as a conversion lens (12) for converting a reference beam (L2) into a parallel beam, since the lens has a main point (Q) on a side of a light outgoing plane (12a), the conversion lens (12) can be arranged between a light source (11) and the main point (Q) of the conversion lens (12). Therefore, since a distance between the light source (11) and a reflection mirror (13) can be shortened, the optical system of the hologram type reproducing device (10) can be reduced in sizes.
Inventors:
UMEDA YUICHI (JP)
Application Number:
PCT/JP2006/311258
Publication Date:
December 14, 2006
Filing Date:
June 06, 2006
Export Citation:
Assignee:
ALPS ELECTRIC CO LTD (JP)
UMEDA YUICHI (JP)
UMEDA YUICHI (JP)
International Classes:
G03H1/26; G11B7/0065; G11B7/135
Domestic Patent References:
| WO2005047987A1 | 2005-05-26 |
Foreign References:
| EP1531466A2 | 2005-05-18 | |||
| JPH0112758A |
Other References:
See also references of EP 1895369A4
Attorney, Agent or Firm:
Nozaki, Teruo (1-21-11 Higashi-Ikebukuro Toshima-ku, Tokyo, JP)
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