Title:
アナモルフィックプリズム及び光学ヘッド並びに光記録再生装置
Document Type and Number:
Japanese Patent JP4483021
Kind Code:
B2
Abstract:
An anamorphic prism according to the invention comprises a first prism (2) made of a first light transmitting material and a second prism (3) made of a second light transmitting material, the first prism and the second prism being bonded together along predetermined respective planes thereof, the light beam entering the first prism being expanded or compressed in a particular direction of cross section of the light beam with a predetermined magnification, the expanded or compressed light beam being let to exit from the second prism (3) and proceed in a direction substantially same as the proceeding direction of the incident light beam entering the first prism (2). There are provided an anamorphic prism that can easily modify the intensity distribution of the light beam on the recording medium and allow the device comprising it to operate for signal recording/reproduction in optimal conditions without significantly increasing the dimensions of the device as well as an optical head and an optical recording/reproduction device comprising such an anamorphic prism that are small and can be manufactured with a high manufacturing efficiency. The refractive indices of the first light transmitting material and the second light transmitting material respectively are selected to allow operation when the wavelength of the light beam is slightly changed.
Inventors:
Noriaki Nishi
Application Number:
JP2000123723A
Publication Date:
June 16, 2010
Filing Date:
April 19, 2000
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G02B5/04; G11B7/1356; G02B13/00; G02B27/09; G05B5/04; G11B7/135
Domestic Patent References:
| JP2187935A | ||||
| JP63076818U | ||||
| JP9080212A | ||||
| JP10268113A | ||||
| JP10062611A |
Attorney, Agent or Firm:
Akira Koike
Eiichi Tamura
Seiji Iga
Eiichi Tamura
Seiji Iga