Aspheric lens and optical pickup including the same
AssigneeSamsung Electronics Co., Ltd.
InventorsBong-gi KIM, Ichiro MORISHITA, Soo-han PARK, Joong-eon SEO
Life of this patent
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Abstract
An aspheric lens includes at least one aspheric lens surface, and an angle of inclination on the aspheric lens surface is smaller than or equal to 65°. The aspheric lens surface is given by the equation Z ( r ) = cr 2 1 + 1 - ( 1 + K ) c 2 r 2 + Lr 2 + Ar 4 + Br 6 + Cr 8 + Dr 10 + Er 12 + Fr 14 + Gr 16 + Hr 18 + Jr 20 where L≠0, c is a curvature, r2=x2+y2, K is a conic integer, and L and A through J are aspheric coefficients.
Claims20
An aspheric lens comprising at least one aspheric lens surface, wherein an angle of inclination on the aspheric lens surface is smaller than or equal to 65°.
An optical pickup apparatus comprising:
- a light source to emit light;
- and
- an objective lens to transmit the light and receive the light reflected from an disc,
- wherein the objective lens comprises an aspheric lens having an aspheric lens surface, and an angle of inclination on the aspheric lens surface is smaller than or equal to 65°.
An optical information storage media system comprising:
- an optical pickup apparatus comprising
- a light source to emit light, and
- an objective lens to transmit the light and receive the light reflected from an disc,
- wherein the objective lens comprises an aspheric lens having an aspheric lens surface, and an angle of inclination on the aspheric lens surface is smaller than or equal to 65°;
- and
- a control unit to control the optical pickup apparatus to write and read information using the light.
An aspheric lens comprising at least one aspheric lens surface which can be determined by equation of:
- Z
-
- (
- r
- )
- =
- cr
- 2
- 1
- +
- 1
- -
- (
- 1
- +
- K
- )
-
- c
- 2
-
- r
- 2
- +
- Lr
- 2
- +
- Ar
- 4
- +
- Br
- 6
- +
- Cr
- 8
- +
- Dr
- 10
- +
- Er
- 12
- +
- Fr
- 14
- +
- Gr
- 16
- +
- Hr
- 18
- +
- Jr
- 20
- where L≠0, c is a curvature, r2=x2+y2, K is a conic integer, and L and A through J are aspheric coefficients.
An aspheric lens usable as an objective lens of an optical information storage media system, the aspheric lens comprising at least one aspheric lens surface which can be determined by equation comprising:
- a first term corresponding to an elliptical surface characteristic;
- a second term corresponding to a parabolic surface characteristic:
- and
- higher-order terms corresponding to slope characteristics of the aspheric lens surface.
An optical pickup apparatus comprising:
- a light source to emit light;
- and
- an objective lens to transmit the light and receive the light reflected from an disc,
- wherein the objective lens comprises an aspheric lens having an aspheric lens surface which can be determined by equation comprising:
- a first term corresponding to an elliptical surface characteristic;
- a second term corresponding to a parabolic surface characteristic:
- and
- higher-order terms corresponding to slope characteristics of the aspheric lens surface.
An optical information storage media system comprising:
- an optical pickup apparatus comprising
- a light source to emit light, and
- an objective lens to transmit the light and receive the light reflected from an disc,
- wherein the objective lens comprises an aspheric lens having an aspheric lens surface which can be determined by equation comprising a first term corresponding to an elliptical surface characteristic, a second term corresponding to a parabolic surface characteristic, and higher-order terms corresponding to slope characteristics of the aspheric lens surface;
- and
- a control unit to control the optical pickup apparatus to write and read information using the light.
Dependencies are inferred from the claim text.