EP0090379A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Data track searching device
Assignee: Panasonic Holdings Corp
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Filing: 1983-03-25
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Granted: —
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Expires: 2003-03-25
Abstract
Abstract A data track searching device capable of switching between two modes; one being the rough searching mode in which a transducer is displaced at a high velocity to a desired track and the other being the fine searching mode which follows the rough searching mode and in which the transducer is displaced at a relative low velocity and positioned over the proper or desired track. The operating point of a tracking element is shifted or deviated as a result of the high-velocity displacement of the transducer in the rough searching mode so that stable searching cannot be ensured. According to the present invention, therefore, the acceleration of the transducer in the rough searching mode is detected and a signal representative of the thus detected acceleration is applied to the tracking element so that the shift or deviation of the operating point of the tracking element can substantially made nil.
Inventors
- 👤 Mitsuro Moriya
- 👤 Toshiji Kanamaru
- 👤 Yoshinobu Nakata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 14:29
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/08; G11B21/081; G11B21/083; G11B21/085; G11B7/00; G11B7/08; G11B7/085; G11B7/08505; G11B7/08517; G11B7/08529; G11B7/08541
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
210 words
A data track searching device characterized by comprising (a) transducer means for writing and/or reading data onto or out of an information medium with a track or a multiplicity of tracks along which data are to be written or recorded, (b) first driving means for displacing said transducer means in the direction substantially perpendicular to the direction of said a track or tracks on said information medium, (c) a second driving means for displacing said transducer means and said first driving means in the direction substantially perpendicular to the direction of said a track or tracks on said information medium, (d) tracking control means for controlling said first driving means in such a way that the scanning position of said transducer means can always be positioned above a desired track on said information medium, and (e) acceleration signal generating means for generating a signal substantially corresponding to the displacement acceleration of said second driving means, whereby when said second driving means is displaced while said tracking control means being made inoperative, the signal generated by said acceleration signal generating means is applied to said first driving means so that the shift or variation of said first driving means due to the displacement of said second driving means can be minimized.
Claim 2
Dependent Claim
210 words
A data track searching device characterized by comprising (a) transducer means for writing and/or reading data onto or out of an information medium with a track or a multiplicity of tracks along which data are to be written or recorded, (b) first driving means for displacing said transducer means in the direction substantially perpendicular to the direction of said a track or tracks on said information medium, (c) a second driving means for displacing said transducer means and said first driving means in the direction substantially perpendicular to the direction of said a track or tracks on said information medium, (d) tracking control means for controlling said first driving means in such a way that the scanning position of said transducer means can always be positioned above a desired track on said information medium, and (e) acceleration signal generating means for generating a signal substantially corresponding to the displacement acceleration of said second driving means, whereby when said second driving means is displaced while said tracking control means being made inoperative, the signal generated by said acceleration signal generating means is applied to said first driving means so that the shift or variation of said first driving means due to the displacement of said second driving means can be minimized.
Claim 3
Dependent Claim
43 words
A data track searching device as set forth in Claim 1 further characterized in that said acceleration signal generating means is so designed and constructed that in response to the displacement velocity of said second driving means the displacement acceleration signal is generated.
Claim 4
Dependent Claim
65 words
A data track searching device as set forth in Claim 2 further characterized in that the displacement velocity of said second driving means is detected, and a signal representative of said detected displacement velocity is applied across a series circuit comprising a capacitor and a resistor so that the displacement acceleration of said second driving means can be detected from a signal across said resistor.
Claim 5
Dependent Claim
36 words
A data track searching device as set forth in Claim 2 further characterized in that in response to the signal for driving said second driving means, the displacement acceleration of said second driving means is detected.
Claim 6
Dependent Claim
74 words
A data track searching device as set forth in Claim 1 further characterized in that the displacement velocity of said second driving means is detected in response to the signal representative of the traversing across each track on said recording medium by the scanning position of said transducer means when said second driving means is displaced, and in response to the detected displacement velocity the displacement acceleration of said second driving means is detected.
Claim 7
Dependent Claim
108 words
A data track searching device as set forth in Claim 1 further characterized in that said acceleration signal generating means is so designed and constructed that it detects the direction as well as the distance in and over which said second driving means must travel in order to bring said transducer means on one track on said recording medium onto a desired track, it detects the displacement of said second driving means, it detects the direction of the displacement acceleration of said second driving means from the thus detected distance and displacement, and it generates a predetermined signal corresponding to the thus detected direction of the displacement acceleration.
References Cited (Backward Citations)
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