Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1989-12-06
1992-10-20
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7717, G11B 5592
Patent
active
051575639
ABSTRACT:
A magnetic recording and reproducing apparatus for performing automatic tracking in a video tape recorder of a helical scan type. A magnetic head is wobbled by an electromagnetically driven actuator in a transverse direction of a recording track, a tracking error signal is obtained by extracting a signal component attributable to this wobbling from a signal reproduced by the magnetic head, and the extracted signal component is fed back to the electromagnetically driven actuator. By setting the magnetic head width to 1-1.5 times the recording track width, a dead zone is made small, and the tracking error signal is obtained positively. In addition, by setting the frequency for driving the electromagnetically driven actuator at a level between a primary resonance frequency and a secondary resonance frequency and by subjecting the driving frequency to phase conversion, the driving frequency is converted into a high frequency to permit highly accurate tracking. Furthermore, any deviation in the tracking by a fixed magnetic head caused by a DC current and the like is prevented by extracting a low-frequency component containing a DC component from the tracking error signal and by feeding back that extracted signal to a capstan motor for driving a magnetic tape.
REFERENCES:
patent: 3126535 (1964-03-01), Streeter
patent: 4080636 (1978-03-01), Ravizza
patent: 4163994 (1979-08-01), Sakamoto et al.
patent: 4229773 (1980-10-01), Sakamoto
patent: 4327384 (1982-04-01), Tomita et al.
patent: 4656529 (1987-04-01), Sakamoto
patent: 4796128 (1989-01-01), Takimoto
patent: 4882635 (1989-11-01), Sanai
patent: 4970611 (1990-11-01), Kodama et al.
Patent Abstracts of Japan, vol.6, No. 125 (P-127) (1003) 10 Jul. 1982, & JP-A-57 (Tokyo Shibaura) 24 Mar. 1982.
Nagasawa Masato
Yokoyama Eiji
Mitsubishi Denki & Kabushiki Kaisha
Psitos Aristotelis
Robertson David L.
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