Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1980-10-16
1985-06-04
Cardillo, Jr., Raymond F.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 58, G11B 712, G11B 2736
Patent
active
045218765
ABSTRACT:
A monitoring apparatus is used in an optical recording apparatus which performs the recording by respectively forming a first beam spot and a second beam spot by focusing light beam portions respectively having diameters smaller than that of first light beam and second light beam respectively modulated by first signal and second signal on a recording medium by use of focusing lens. The monitoring apparatus comprises an enlarging and imaging optical system for enlarging and imaging reflected beams of the first and second beam spots from the recording medium, by obtaining the reflected beams outside optical paths of the first and second light beams, reflecting optical system for reflecting the first and second light beams at an optical path leading to the focusing lens for focusing the first and second light beams by use of an optical member, and supplying the reflected first and second light beams to the enlarging and imaging optical system as incident light, and monitoring optical system for monitoring images imaged by the enlarging and imaging optical system.
REFERENCES:
patent: 2318138 (1943-05-01), Benfer
patent: 4027330 (1977-05-01), Maslowski et al.
patent: 4093961 (1978-06-01), Kanamaru
patent: 4100577 (1978-07-01), Naruse
patent: 4315283 (1982-02-01), Kinjo et al.
Bernat Louis
Cardillo, Jr. Raymond F.
Victor Company of Japan , Limited
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