Nova Patents
NO960962L

Seek actuator for optical recording

Abstract

A device (100) for controlling the position of a lens (66) in an optical data storage (50) with retrieval drive includes a carriage carrying an optical lens holder (210) by a series of bending arms (260, 262, 264, 266). A lens (66) is mounted in the lens holder (210) so that the mass center of the suspended lens holder (210) lies on the optical axis O of the lens (66) and also coincides with the mass center of the lens (66). The lens holder (210) can move relative to the carriage (150) with at least one degree of freedom. The mass center of the carriage (150) is within 0.1 mm of the optical axis O near the lens center mass center (210). Suspension forces acting on the lens holder (210) are symmetrical about the optical axis (0). A rough magnetic drive (142, 144) moves the carriage (150) in a tracking direction and exerts forces on the carriage (150) which are balanced and symmetrical about the optical axis (0), so that moments about the mass center of the carriage (150) are absent. Inertial forces acting on the carriage (150) and forces acting on the magnetic drives (142, 144) forces are also balanced and symmetrical with respect to the optical axis (0) and produce negligible moments about the mass center of the carriage (150). There is a fine tracking drive and a focus drive for the lens holder (210) both of which drive symmetrical forces about the moments about the optical inertia forces and reactive optical lens holder optical axis (0). produces balanced and optical axis (0) so that axis (0) is absent,

Term

No projected expiry on record.

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1 claim: 1 independent, 0 dependent

  1. 1
    momenter om den optiske akse (0) er fraværende. moments about the optical axis (0) are absent. Inertial forces and reactive forces acting on the optical lens holder (210) are also symmetrical about the optical axis (0). As a result, the object lens (66) moves along its optical axis and in its tracking direction without changing position and its focus point can be precisely controlled relative to the surface of a storage medium (50) to be read or written. Treghetskrefter og reaktive krefter som virker på den optiske linseholder (210) er også symmetriske om den optiske akse (0). Som et resultat beveger objektlvllnsen (66) seg langs sin optiske akse og i sin sporingsretning uten å endre stilling og dens fokuspunkt kan styres nøyaktig i forhold til overflaten av et lagringsmedium (50) som skal leses eller skrives.