A position control apparatus of an optical system capable of positioning a lens at a high accuracy in a near-field optical system using a solid immersion lens. An objective lens 2 and a solid immersion lens are fixed to a lens holder 4. The lens holder 4 is moved by a tracking actuator 5 in the tracking direction of an optical disk 51 and is moved by a focus actuator 8 in the focus direction. The focus actuator 8 is controlled on the basis of the electrostatic capacitance occurring between the solid immersion lens 3 and the optical disk 51.

Claims

28 · 9 independent · depth 3

28 granted claims

›1.independentA position control apparatus of an optical system comprising an optical system forming a near-field with an optical storage medium and irradiating a c…+2

›4.independentA position control apparatus of an optical system comprising an optical system forming a near-field with an optical storage medium and irradiating a c…+5

›5.↳ 4A position control apparatus of an optical system as set forth in claim 4 , wherein said first control circuit controls said first actuator on the bas…d2

›6.↳ 4A position control apparatus of an optical system as set forth in claim 4 , further comprising a moving means for moving an optical head carrying at l…d2

›7.↳ 4A position control apparatus of an optical system as set forth in claim 4 , wherein said second control circuit controls said second actuator on the b…d2

›8.↳ 4A position control apparatus of an optical system as set forth in claim 4 , wherein said second control circuit generates a tracking error signal usin…d2

›9.↳ 4A position control apparatus of an optical system as set forth in claim 4 , wherein the numerical aperture of said optical system is not less than 1, …d2

›10.independentA position control apparatus of an optical system comprising an optical system forming a near-field with an optical storage medium and irradiating a c…+4

›11.↳ 10A position control apparatus of an optical system as set forth in claim 10 , wherein said first control circuit controls said first actuator on the ba…d2

›12.↳ 10A position control apparatus of an optical system as set forth in claim 10 , wherein said second control circuit controls said second actuator on the …d2+1

›14.↳ 10A position control apparatus of an optical system as set forth in claim 10 , wherein the numerical aperture of said optical system is not less than 1,…d2

›15.independentA position control method of an optical system for controlling a distance with an optical system which forms a near-field with an optical storage medi…+2

›18.independentA position control method of an optical system for controlling the distance between an optical system which forms a near-field with an optical storage…+1

›20.independentA position control method of an optical system for controlling the distance between an optical system which forms a near-field with an optical storage…+1

›22.independentA storage and reproduction apparatus comprising a light source, an optical system forming a near-field with an optical storage medium and irradiating …+1

›24.independentA storage and reproduction apparatus comprising a light source, an optical system forming a near-field with an optical storage medium and irradiating …+2

›27.independentA storage and reproduction apparatus comprising a light source, an optical system forming a near-field with an optical storage medium and irradiating …+1

A storage and reproduction apparatus comprising a light source, an optical system forming a near-field with an optical storage medium and irradiating a converging light beam to the optical storage medium, wherein an objective lens converging the light beam to be irradiated to the optical storage medium and a solid immersion lens with an electrode formed on a surface facing the optical storage medium and irradiating the light beam converged by the objective lens to the optical storage medium are fixed by a holding means, a first actuator for moving the holding means in a focus direction perpendicularly intersecting the storage surface of the optical storage medium, a second actuator for moving the holding means in a direction perpendicularly intersecting the signal storage direction on the optical storage medium, a first control circuit for controlling the first actuator on the basis of electrostatic capacitance formed by the electrode and the optical storage medium and of a reflected light from the optical storage medium so that the distance between the solid immersion lens and the optical storage medium becomes within the region where the near-field is formed, a second control circuit for controlling the second actuator on the basis of the reflected light from the optical storage medium, a first moving means for moving an optical head carrying at least the optical system, the first actuator, and the second actuator in the direction perpendicularly intersecting the signal storage direction on the optical storage medium, a second moving means for moving an optical head carrying at least the optical system, the first actuator, and the second actuator in the signal storage direction on the optical storage medium, an intensity modulation circuit for modulating the intensity of the light from the light source according to the information to be stored when storing information, and an information detection circuit for detecting the stored information from the reflected light reflected by the optical storage medium when reproducing information.

Classifications

4 codes

IPC · International Patent Classification

Section G — Physics

G11B7/00

USPC · US Patent Classification

369/44.11369/43369/112.23

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2.5 y

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Examiner

Richemond Dorvil

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20010021145 A1	13 Sep 2001

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