US5768031A
Expired / Lapsed
US
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Objective lens
Assignee: LG Electronics Inc
•
Filing: 1996-09-12
•
Granted: 1998-06-16
•
Expires: 2016-09-12
Abstract
Abstract An objective lens having a first surface and a second surface, includes a first face formed on the first surface, a second face formed on the second surface, and a third face formed on one of the first and second surfaces. The first, second, and third faces are adapted in such a way that the objective lens has at least two focal lengths.
Inventors
- 👤 Keun Y. Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:38
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G02; G02B; G02B3/00; G02B3/10; G11B7/12; G11B7/135; G11B7/1372; G11B7/1374; G11B2007/0003; G11B2007/0006; G11B2007/13727
Claims Analysis
Total Claims: 80
Claim 1
Independent Claim
75 words
An objective lens having a first surface on one side and a second surface on the other side, the objective lens comprising; a first face formed on the first surface, a second face formed on the second surface, and a third face formed on one of the first and second surfaces, wherein the first, second, and third faces are adapted in such a way that the objective lens has at least two different focal points.
Claim 2
Dependent Claim
75 words
An objective lens having a first surface on one side and a second surface on the other side, the objective lens comprising; a first face formed on the first surface, a second face formed on the second surface, and a third face formed on one of the first and second surfaces, wherein the first, second, and third faces are adapted in such a way that the objective lens has at least two different focal points.
Claim 3
Dependent Claim
125 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient, a second aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, and a third aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient, wherein the first, second, and third aspherical faces are adapted in such a way that the objective lens has at least two different focal points.
Claim 4
Dependent Claim
125 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient, a second aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, and a third aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient, wherein the first, second, and third aspherical faces are adapted in such a way that the objective lens has at least two different focal points.
Claim 5
Dependent Claim
16 words
An objective lens of claim 2, wherein the first and second aspherical faces are radially formed.
Claim 6
Dependent Claim
16 words
An objective lens of claim 2, wherein the first and second aspherical faces are annularly formed.
Claim 7
Dependent Claim
23 words
An objective lens of claim 2, wherein the area of the first aspherical face is equal to that of the second aspherical face.
Claim 8
Dependent Claim
23 words
An objective lens of claim 2, wherein the area of the first aspherical face is different from that of the second aspherical face.
Claim 9
Dependent Claim
29 words
An objective lens of claim 2, wherein the curvature radii of the first and second aspherical faces are each larger than the curvature radius of the third aspherical face.
Claim 10
Dependent Claim
33 words
An objective lens of claim 3, wherein an effective diameter of the first aspherical face is different from that of the second aspherical face so that numerical apertures for the focal points differ.
Claim 11
Dependent Claim
125 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient, a second aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, and a third aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient, wherein the first, second, and third aspherical faces are adapted in such a way that the objective lens has at least two different focal points.
Claim 12
Dependent Claim
125 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient, a second aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, and a third aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient, wherein the first, second, and third aspherical faces are adapted in such a way that the objective lens has at least two different focal points.
Claim 13
Dependent Claim
16 words
An objective lens of claim 9, wherein the first and second aspherical faces are radially formed.
Claim 14
Dependent Claim
16 words
An objective lens of claim 9, wherein the first and second aspherical faces are annularly formed.
Claim 15
Dependent Claim
23 words
An objective lens of claim 9, wherein the area of the first aspherical face is equal to that of the second aspherical face.
Claim 16
Dependent Claim
23 words
An objective lens of claim 9, wherein the area of the first aspherical face is different from that of the second aspherical face.
Claim 17
Dependent Claim
29 words
An objective lens of claim 9, wherein the curvature radius of the third aspherical face is larger than each of curvature radii of the first and second aspherical faces.
Claim 18
Dependent Claim
33 words
An objective lens of claim 10, wherein an effective diameter of the first aspherical face is different from that of the second aspherical face so that numerical apertures for the focal points differ.
Claim 19
Dependent Claim
154 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient, a second aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, a third aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient, and a fourth aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient which are different from those of the third aspherical face, wherein the first, second, third, and fourth aspherical faces are adapted in such a way that the objective lens has at least two focal points.
Claim 20
Dependent Claim
154 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient, a second aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, a third aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient, and a fourth aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient which are different from those of the third aspherical face, wherein the first, second, third, and fourth aspherical faces are adapted in such a way that the objective lens has at least two focal points.
Claim 21
Dependent Claim
18 words
An objective lens of claim 16, wherein the first, second, third, and fourth aspherical faces are radially formed.
Claim 22
Dependent Claim
18 words
An objective lens of claim 16, wherein the first, second, third, and fourth aspherical faces are annularly formed.
Claim 23
Dependent Claim
40 words
An objective lens of claim 16, wherein the area of the first aspherical face is equal to that of the second aspherical face, and the area of the third aspherical face is equal to that of the fourth aspherical face.
Claim 24
Dependent Claim
40 words
An objective lens of claim 16, wherein the area of the first aspherical face is different from that of the second aspherical face, and the area of the third aspherical face is different form that of the fourth aspherical face.
Claim 25
Dependent Claim
33 words
An objective lens of claim 16, wherein the curvature radii of the first and second aspherical faces are each larger than each of the curvature radii of the third and fourth aspherical faces.
Claim 26
Dependent Claim
33 words
An objective lens of claim 17, wherein an effective diameter of the first aspherical face is different from that of the second aspherical face so that numerical apertures for the focal points differ.
Claim 27
Dependent Claim
119 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first spherical face formed on the first surface and specified by a curvature radius, a second spherical face formed on the first surface and specified by a curvature radius which is different from that of the first spherical face, and an aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient, wherein the first and second spherical faces and the aspherical faces are adapted in such a way that the objective lens has at least two different focal points.
Claim 28
Dependent Claim
119 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first spherical face formed on the first surface and specified by a curvature radius, a second spherical face formed on the first surface and specified by a curvature radius which is different from that of the first spherical face, and an aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient, wherein the first and second spherical faces and the aspherical faces are adapted in such a way that the objective lens has at least two different focal points.
Claim 29
Dependent Claim
16 words
An objective lens of claim 23, wherein the first and second spherical faces are radially formed.
Claim 30
Dependent Claim
16 words
An objective lens of claim 23, wherein the first and second spherical faces are annularly formed.
Claim 31
Dependent Claim
23 words
An objective lens of claim 23, wherein the area of the first spherical face is equal to that of the second spherical face.
Claim 32
Dependent Claim
23 words
An objective lens of claim 23, wherein the area of the first spherical face is different from that of the second spherical face.
Claim 33
Dependent Claim
28 words
An objective lens of claim 23, wherein the curvature radii of the first and second spherical faces are each larger than the curvature radius of the aspherical face.
Claim 34
Dependent Claim
33 words
An objective lens of claim 24, wherein an effective diameter of the first spherical face is different from that of the second spherical face so that numerical apertures for the focal points differ.
Claim 35
Dependent Claim
123 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient, a second aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, and a spherical face formed on the first surface and specified by a curvature radius, wherein the first and second aspherical faces and the spherical face are adapted in such a way that the objective lens has at least two different focal points.
Claim 36
Dependent Claim
123 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient, a second aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, and a spherical face formed on the first surface and specified by a curvature radius, wherein the first and second aspherical faces and the spherical face are adapted in such a way that the objective lens has at least two different focal points.
Claim 37
Dependent Claim
16 words
An objective lens of claim 30, wherein the first and second aspherical faces are radially formed.
Claim 38
Dependent Claim
16 words
An objective lens of claim 30, wherein the first and second aspherical faces are annularly formed.
Claim 39
Dependent Claim
23 words
An objective lens of claim 30, wherein the area of the first aspherical face is equal to that of the second aspherical face.
Claim 40
Dependent Claim
23 words
An objective lens of claim 30, wherein the area of the first aspherical face is different from that of the second aspherical face.
Claim 41
Dependent Claim
28 words
An objective lens of claim 30, wherein the curvature radius of the spherical face is larger than each of curvature radii of the first and second aspherical faces.
Claim 42
Dependent Claim
33 words
An objective lens of claim 31, wherein an effective diameter of the first aspherical face is different from that of the second aspherical face so that numerical apertures for the focal points differ.
Claim 43
Dependent Claim
151 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first spherical face formed on the first surface and specified by a curvature radius, a second spherical face formed on the first surface and specified by a curvature radius which is different from that of the first spherical face, a first aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient, and a second aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, wherein the first and second spherical faces and the first and second aspherical faces are adapted in such a way that the objective lens has at least two focal points.
Claim 44
Dependent Claim
151 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first spherical face formed on the first surface and specified by a curvature radius, a second spherical face formed on the first surface and specified by a curvature radius which is different from that of the first spherical face, a first aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient, and a second aspherical face formed on the second surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, wherein the first and second spherical faces and the first and second aspherical faces are adapted in such a way that the objective lens has at least two focal points.
Claim 45
Dependent Claim
23 words
An objective lens of claim 37, wherein the first and second spherical faces and the first and second aspherical faces are radially formed.
Claim 46
Dependent Claim
23 words
An objective lens of claim 37, wherein the first and second spherical faces and the first and second aspherical faces are annularly formed.
Claim 47
Dependent Claim
40 words
An objective lens of claim 37, wherein the area of the first spherical face is equal to that of the second spherical face, and the area of the first aspherical face is equal to that of the second aspherical face.
Claim 48
Dependent Claim
40 words
An objective lens of claim 37, wherein the area of the first spherical face is different from that of the second spherical face, and the area of the first aspherical face is different form that of the second aspherical face.
Claim 49
Dependent Claim
32 words
An objective lens of claim 37, wherein the curvature radii of the first and second spherical faces are each larger than each of curvature radii of the first and second aspherical faces.
Claim 50
Dependent Claim
33 words
An objective lens of claim 38, wherein an effective diameter of the first spherical face is different from that of the second spherical face so that numerical apertures for the focal points differ.
Claim 51
Dependent Claim
123 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient, a second aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, and a spherical face formed on the second surface and specified by a curvature radius, wherein the first and second aspherical faces and the spherical faces are adapted in such a way that the objective lens has at least two different focal points.
Claim 52
Dependent Claim
123 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient, a second aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, and a spherical face formed on the second surface and specified by a curvature radius, wherein the first and second aspherical faces and the spherical faces are adapted in such a way that the objective lens has at least two different focal points.
Claim 53
Dependent Claim
16 words
An objective lens of claim 44, wherein the first and second aspherical faces are radially formed.
Claim 54
Dependent Claim
16 words
An objective lens of claim 44, wherein the first and second aspherical faces are annularly formed.
Claim 55
Dependent Claim
23 words
An objective lens of claim 44, wherein the area of the first aspherical face is equal to that of the second aspherical face.
Claim 56
Dependent Claim
23 words
An objective lens of claim 44, wherein the area of the first aspherical face is different from that of the second aspherical face.
Claim 57
Dependent Claim
28 words
An objective lens of claim 44, wherein the curvature radii of the first and second aspherical faces are each larger than the curvature radius of the spherical face.
Claim 58
Dependent Claim
33 words
An objective lens of claim 45, wherein an effective diameter of the first aspherical face is different from that of the second aspherical face so that numerical apertures for the focal points differ.
Claim 59
Dependent Claim
119 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first spherical face formed on the second surface and specified by a curvature radius, a second spherical face formed on the second surface and specified by a curvature radius which is different from that of the first spherical face, and an aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient, wherein the first and second spherical faces and the aspherical face are adapted in such a way that the objective lens has at least two different focal points.
Claim 60
Dependent Claim
119 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first spherical face formed on the second surface and specified by a curvature radius, a second spherical face formed on the second surface and specified by a curvature radius which is different from that of the first spherical face, and an aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient, wherein the first and second spherical faces and the aspherical face are adapted in such a way that the objective lens has at least two different focal points.
Claim 61
Dependent Claim
16 words
An objective lens of claim 51, wherein the first and second spherical faces are radially formed.
Claim 62
Dependent Claim
16 words
An objective lens of claim 51, wherein the first and second spherical faces are annularly formed.
Claim 63
Dependent Claim
23 words
An objective lens of claim 51, wherein the area of the first spherical face is equal to that of the second spherical face.
Claim 64
Dependent Claim
23 words
An objective lens of claim 51, wherein the area of the first spherical face is different from that of the second spherical face.
Claim 65
Dependent Claim
28 words
An objective lens of claim 51, wherein the curvature radius of the aspherical face is larger than each of curvature radii of the first and second spherical faces.
Claim 66
Dependent Claim
33 words
An objective lens of claim 52, wherein an effective diameter of the first spherical face is different from that of the second spherical face so that numerical apertures for the focal points differ.
Claim 67
Dependent Claim
151 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient, a second aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, a first spherical face formed on the second surface and specified by a curvature radius, and a second spherical face formed on the second surface and specified by a curvature radius which is different from that of the first spherical face, wherein the first and second spherical faces and the first and second aspherical faces are adapted in such a way that the objective lens has at least two focal points.
Claim 68
Dependent Claim
151 words
An objective lens for reading out an optical disk by using a light source, having a first surface facing the optical disk and a second surface facing toward the light source, comprising; a first aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient, a second aspherical face formed on the first surface and specified by a curvature radius and an aspherical coefficient which are different from those of the first aspherical face, a first spherical face formed on the second surface and specified by a curvature radius, and a second spherical face formed on the second surface and specified by a curvature radius which is different from that of the first spherical face, wherein the first and second spherical faces and the first and second aspherical faces are adapted in such a way that the objective lens has at least two focal points.
Claim 69
Dependent Claim
23 words
An objective lens of claim 58, wherein the first and second spherical faces and the first and second aspherical faces are radially formed.
Claim 70
Dependent Claim
23 words
An objective lens of claim 58, wherein the first and second spherical faces and the first and second aspherical faces are annularly formed.
Claim 71
Dependent Claim
40 words
An objective lens of claim 58, wherein the area of the first spherical face is equal to that of the second spherical face, and the area of the first aspherical face is equal to that of the second aspherical face.
Claim 72
Dependent Claim
40 words
An objective lens of claim 58, wherein the area of the first spherical face is different from that of the second spherical face, and the area of the first aspherical face is different form that of the second aspherical face.
Claim 73
Dependent Claim
32 words
An objective lens of claim 58, wherein the curvature radii of the first and second aspherical faces are each larger than each of curvature radii of the first and second spherical faces.
Claim 74
Dependent Claim
33 words
An objective lens of claim 59, wherein an effective diameter of the first spherical face is different from that of the second spherical face so that numerical apertures for the focal points differ.
Claim 75
Dependent Claim
125 words
An optical pickup for reading out an optical media, comprising: a light source for generating a light beam; an objective lens for focusing the light beam onto the optical media, the objective lens having a first surface facing the optical disk and a second surface facing toward the light source, the objective lens including a first face formed on the first surface, a second face formed on the second surface, and a third face formed on one of the first and second surfaces, wherein the first, second, and third faces are adapted in such a way that the objective lens has at least two different focal points with respect to the light beam, and a detector for detecting a signal reflected from the optical media.
Claim 76
Dependent Claim
125 words
An optical pickup for reading out an optical media, comprising: a light source for generating a light beam; an objective lens for focusing the light beam onto the optical media, the objective lens having a first surface facing the optical disk and a second surface facing toward the light source, the objective lens including a first face formed on the first surface, a second face formed on the second surface, and a third face formed on one of the first and second surfaces, wherein the first, second, and third faces are adapted in such a way that the objective lens has at least two different focal points with respect to the light beam, and a detector for detecting a signal reflected from the optical media.
Claim 77
Dependent Claim
19 words
An optical pickup of claim 65, further comprising; a converging lens for converging the signal onto the detecting means.
Claim 78
Dependent Claim
22 words
An optical pickup of claim 66, further comprising; a partially reflecting mirror for reflecting the light beam and transmitting the signal beam.
Claim 79
Dependent Claim
91 words
An objective lens for reading out an optical disk by using a light source, the objective lens having a first surface facing the optical disk and a second surface facing toward the light source, the objective lens comprising; a first face formed on the first surface, a second face formed on the second surface, and a third face formed on one of the first and second surfaces, wherein the first, second, and third faces are adapted in such a way that the objective lens has at least two different focal points.
Claim 80
Dependent Claim
91 words
An objective lens for reading out an optical disk by using a light source, the objective lens having a first surface facing the optical disk and a second surface facing toward the light source, the objective lens comprising; a first face formed on the first surface, a second face formed on the second surface, and a third face formed on one of the first and second surfaces, wherein the first, second, and third faces are adapted in such a way that the objective lens has at least two different focal points.
References Cited (Backward Citations)
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