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US 2002/0053646 A1Published application
Radial tilt detector
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorYukihiro Tagawa
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AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorYukihiro Tagawa
Estimating the term…
A radial tilt detector which is capable of detecting a tilt in a radial direction of an optical disc at a high degree of precision and being cost-effective and simple in head part construction. The radial tilt detector is provided in an optical disc information recording/reproduction apparatus which includes an optical head for projecting a condensed beam of light on a recording surface of a rotating optical disc and receiving the projected beam of light reflected from the recording surface of the optical disc, a focus actuator for focusing the condensed beam of light on its projected position of the recording surface of the optical disc, and a driver for outputting a drive signal to drive the focus actuator. The detector comprises an acceleration detector for outputting a signal indicative of an acceleration in a direction depending on an optical axis of the light beam at the position focused by the focus actuator, and a radial tilt calculation processor for receiving the acceleration signal and a signal indicative of a distance between the center of the optical disc and the projected position of the light beam on the recording surface of the optical disc and calculating the radial tilt using the received signals and a rotation velocity of the optical disc or a linear velocity at which the light beam scans the recording surface of the optical disc.
A radial tilt detector adapted to, by measuring an acceleration of a spot position on a recording surface of an optical disc at which a beam of light is condensed, in a focusing direction of said optical disc, a velocity of said spot position in a rotation direction of said optical disc and a distance from the center of said optical disc to said spot position, calculate an angle defined by three vectors, or an acceleration vector in said focusing direction of said optical disc, an acceleration vector toward said center of said optical disc and perpendicular to said acceleration vector in said focusing direction of said optical disc and a resultant vector of said acceleration vector in said focusing direction of said optical disc and said acceleration vector toward said center of said optical disc and detect a radial tilt angle on the basis of the calculated angle, said radial tilt angle being a tilt angle in a radial direction of said optical disc.
A radial tilt detector for an optical disc information recording/reproduction apparatus which includes an optical head for projecting a condensed beam of light on a recording surface of a rotating optical disc and receiving the projected beam of light reflected from said recording surface of said optical disc, a focus actuator for focusing said condensed beam of light on its projected position of said recording surface of said optical disc, and drive means for outputting a drive signal to drive said focus actuator, said radial tilt detector being adapted to detect a radial tilt which is a tilt amount in a radial direction of said recording surface of said optical disc and comprising:
The radial tilt detector as set forth in claim. 2, wherein said acceleration detection means includes an observer.
Dependencies are inferred from the claim text.