Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1996-04-30
1998-10-20
Le, Que
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502015, 359485, 359490, G02B 530
Patent
active
058250220
ABSTRACT:
A plurality of inclined planes (1419) are formed in the same substrate (1406) and a polarizing optical thin film is provided on these inclined planes. These inclined planes are filled with a transparent material so as to form a small sized and complexed polarizer. This polarizer is excellent in transmission ratio and in extinction ratio. With this polarizer, it is possible to detect a magneto-optical signal with a high signal-to-noise ratio. This polarizer is used as a cover of a package (1408) of an optical head in which a light receiving device (1410, 1411) and a light emitting device (1409) are contained in the form of a single piece. There is also provided an optical element capable of adjusting optical paths so that the optical length of a returning optical beam may be different from the optical length of a forward optical beam. With this optical element, it becomes possible to delete the initial offset in a focusing error signal, and thus adjustment process becomes unnecessary. With these arrangements, it is possible to achieve the size reduction, simplification, and improvement of performance associated with an optical head for use in a magneto-optical recording/reproducing device.
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Arimura Toshio
Takeda Takashi
Takekoshi Taro
Yonekubo Masatoshi
Le Que
Lee John R.
Seiko Epson Corporation
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