Information recording and reproducing apparatus including detect

Details Information recording and reproducing apparatus including detect Information recording and reproducing apparatus including detect

1991-08-06

1992-06-02

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

235454, G11B 700

Patent

active

051193566

ABSTRACT:
An information recording and reproducing apparatus includes a head unit for recording information on and reproducing information from an information recording medium having a plurality of linear tracks arranged in parallel, a device for moving the head unit relative to the recording medium, and a detector for detecting whether the record medium has been loaded into the apparatus in a normal state. The detector includes a photo-detection unit having a light projector for projecting a light beam to the recording medium and a photo-detector for detecting a light beam from the recording medium. The photo-detection unit is arranged such that when the recording medium is inserted in the normal state, the light beam from the light projector illuminates a track of the recording medium and the photo-detector detects high-order diffracted light from the illuminated track.

REFERENCES:
patent: 4497049 (1985-01-01), Costemore D'Arc
patent: 4680744 (1987-07-01), Kanamaru
patent: 4723234 (1988-02-01), Katsuyama et al.
patent: 4751394 (1988-06-01), Matsuoka et al.
patent: 4809252 (1989-02-01), Ikedo et al.
patent: 4893293 (1990-01-01), Endo et al.
Cover sheet of U.S. Pat. No. 4,672,759; Pocheity et al.

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