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US 8,045,433 B2Granted
Coil controlling for optical pick-up
AssigneeSanyo Electric Co., Ltd.
InventorNoboru Onojima
Life of this patent
Estimating the term…
Abstract
A pickup apparatus including: at least a coil constituting an actuator, a signal to be sent to the coil being obtained by calculation using an algorithm on the basis of at least one of a focus error signal and a tracking error signal.
Claims10
A pickup apparatus comprising:
- at least a coil constituting an actuator,
- a signal to be sent to the coil being obtained by calculation using an algorithm on the basis of at least one of a focus error signal and a tracking error signal, wherein
- the signal to be sent to the coil is obtained by calculation on the basis of the following formula (A),
- [
- FO
-
-
- 1
- FO
-
-
- 2
- TR
- ]
- =
- [
- A
-
-
- 11
- A
-
-
- 12
- A
-
-
- 13
- A
-
-
- 14
- A
-
-
- 21
- A
-
-
- 22
- A
-
-
- 23
- A
-
-
- 24
- A
-
-
- 31
- A
-
-
- 32
- A
-
-
- 33
- A
-
-
- 34
- ]
-
- [
- FE
- TILT
- TE
- TE
- 2
- ]
- (
- A
- )
- where
- FO1 represents a driving signal to be input into a first focus/tilt coil;
- FO2 represents a driving signal to be input into a second focus/tilt coil;
- TR represents a driving signal to be input into a tracking coil;
- A11, A12, A13, A14, A21, A22, A23, A24, A31, A32, A33, and A34 represent coefficients having arbitrary values;
- FE represents a focus error signal;
- TE represents a tracking error signal;
- and
- TILT represents a correction tilt amount signal.
82 more elements
A pickup apparatus capable of reading out a signal from a media and/or writing a signal into the media, comprising:
- a lens configured to irradiate the media with light;
- a first focus/tilt coil and a second focus/tilt coil, configured to drive the lens at least substantially along an optical axis direction of the lens;
- and
- a tracking coil configured to drive the lens substantially along a radial direction of the media,
- in the case where a driving signal to be input into the first focus/tilt coil is defined as FO1, and where a driving signal to be input into the second focus/tilt coil is defined as FO2, and where a driving signal to be input into the tracking coil is defined as TR, and where a focus error signal detected when out-of-focus of the light substantially along the optical axis direction of the lens with respect to the media occurs, is defined as FE, and where a tracking error signal detected when out-of-focus of the light substantially along the radial direction of the media with respect to the media occurs, is defined as TE, and where a correction tilt amount signal for correcting angle misalignment of the objective lens when a focus angle misalignment of the light with respect to the media occurs, is defined as TILT,
- the driving signal to be input into the first focus/tilt coil being determined on the basis of the following formula (1), and the driving signal to be input into the second focus/tilt coil being determined on the basis of the following formula (2), and the driving signal to be input into the tracking coil being determined on the basis of the following formula (3),
- FO1=(A11×FE)+(A12×TILT)+(A13×TE)+(A14×TE2) (1)
- FO2=(A21×FE)+(A22×TILT)+(A23×TE)+(A24×TE2) (2)
- TR=(A31×FE)+(A32×TILT)+(A33×TE)+(A34×TE2) (3)
- where the coefficients A11, A12, A13, A14, A21, A22, A23, A24, A31, A32, A33, and A34 have arbitrary values.
7 more elements
Dependencies are inferred from the claim text.