US2007171803A1PendingUtilityA1
Optical pickup device having chromatic aberration correction lens
Assignee: SAMSUNG ELECTRONICS CO LTDPriority: Sep 21, 2000Filed: Feb 23, 2007Published: Jul 26, 2007
Est. expirySep 21, 2020(expired)· nominal 20-yr term from priority
G11B 7/1378G11B 7/13922G02B 27/0025G11B 2007/13727
61
PatentIndex Score
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Cited by
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0
Claims
Abstract
An optical pickup device includes a light source to emit light, an objective lens to focus the light on a recording medium to form a light spot, an optical path changer on an optical path between the light source and the objective lens to change the path of incident light, a chromatic aberration correction lens disposed on an optical path between the light source and the objective lens, and a photodetector to receive light which is reflected from the recording medium and is then incident thereon through the optical path changer. The chromatic aberration correction lens corrects a chromatic aberration occurring due to a change in the wavelength and/or due to an increase in a wavelength bandwidth of the light. The chromatic aberration correction lens includes at least two lenses such that a lens having a positive power and a lens having a negative power are adjacent to each other.
Claims
exact text as granted — not AI-modified1 . A single objective lens for an optical pickup device, the single objective lens having a numerical aperture (NA) of 0.85 or more, wherein both lens surfaces of the single objective lens are aspherical.
2 . The single objective lens of claim 1 , wherein the numerical aperture (NA) is equal to or greater than 0.85 with respect to light having a wavelength of 420 nm or less.
3 . The single objective lens of claim 1 , wherein the numerical aperture (NA) is 0.85.
4 . The single objective lens of claim 3 , wherein depths z from aspherical vertices of the both lens surfaces are respectively expressed by Equation 1:
z
=
c
h
2
1
+
1
-
(
1
+
K
)
c
2
h
2
+
A
h
4
+
B
h
6
+
C
h
8
+
D
h
10
+
E
h
12
+
F
h
14
+
G
h
16
+
H
h
18
+
J
h
20
,
(
2
)
where h is a height from an optical axis, c is a curvature, K is a conic coefficient, and A, B, C, D, E, F, G, H, and J are aspherical coefficients.
5 . The single objective lens of claim 1 , wherein depths z from aspherical vertices of the both lens surfaces are respectively expressed by Equation 1:
z
=
c
h
2
1
+
1
-
(
1
+
K
)
c
2
h
2
+
A
h
4
+
B
h
6
+
C
h
8
+
D
h
10
+
E
h
12
+
F
h
14
+
G
h
16
+
H
h
18
+
J
h
20
,
(
2
)
where h is a height from an optical axis, c is a curvature, K is a conic coefficient, and A, B, C, D, E, F, G, H, and J are aspherical coefficients.
6 . The single objective lens of claim 3 , wherein the single objective lens is formed of glass or plastics.
7 . The single objective lens of claim 1 , wherein the single objective lens is formed of glass or plastics.
8 . An optical pickup device comprising the single objective lens of claim 1 .
9 . The optical pickup device of claim 8 , wherein the numerical aperture (NA) of the single objective lens is equal to or greater than 0.85 with respect to light having a wavelength of 420 nm or less.
10 . The optical pickup device of claim 8 , wherein the numerical aperture (NA) of the single objective lens is 0.85.
11 . The optical pickup device of claim 10 , further comprising a light source for emitting light having a wavelength of 420 nm or less.
12 . The optical pickup device of claim 8 , wherein depths z from aspherical vertices of the both lens surfaces of the single objective lens are respectively expressed by Equation 1
z
=
c
h
2
1
+
1
-
(
1
+
K
)
c
2
h
2
+
A
h
4
+
B
h
6
+
C
h
8
+
D
h
10
+
E
h
12
+
F
h
14
+
G
h
16
+
H
h
18
+
J
h
20
,
(
2
)
where h is a height from an optical axis, c is a curvature, K is a conic coefficient, and A, B, C, D, E, F, G, H, and J are aspherical coefficients.
13 . The optical pickup device of claim 8 , wherein the single objective lens is formed of glass or plastics.
14 . The optical pickup device of claim 8 , further comprising a light source for emitting light having a wavelength of 420 nm or less.
15 . An optical recording/reproducing device comprising the optical pickup device of claim 8 .
16 . The optical recording/reproducing device of claim 15 , wherein the numerical aperture (NA) of the single objective lens is equal to or greater than 0.85 with respect to light having a wavelength of 420 nm or less.
17 . The optical recording/reproducing device of claim 15 , wherein the numerical aperture (NA) of the single objective lens is 0.85.
18 . The optical recording/reproducing device of claim 15 , wherein depths z from aspherical vertices of the both lens surfaces of the single objective lens are respectively expressed by Equation 1:
z
=
c
h
2
1
+
1
-
(
1
+
K
)
c
2
h
2
+
A
h
4
+
B
h
6
+
C
h
8
+
D
h
10
+
E
h
12
+
F
h
14
+
G
h
16
+
H
h
18
+
J
h
20
,
(
2
)
where h is a height from an optical axis, c is a curvature, K is a conic coefficient, and A, B, C, D, E, F, G, H, and J are aspherical coefficients.
19 . The optical recording/reproducing device of claim 15 , wherein the single objective lens is formed of glass or plastics.
20 . The optical recording/reproducing device of claim 15 , wherein the optical pickup device further comprises a light source for emitting light having a wavelength of 420 nm or less.Join the waitlist — get patent alerts
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