US5321550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system of optical information recording/reproducing apparatus
Assignee: Pentax Corp
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Filing: 1993-01-14
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Granted: 1994-06-14
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Expires: 2013-01-14
Abstract
Abstract An optical system of an optical information recording/reproducing apparatus including a light source for emitting a generally parallel luminous flux; an objective optical system for converging the luminous flux emitted from the light source onto a medium; a beam splitter for splitting the luminous flux reflected by the medium from a light path directed to the light source and guiding the same to a light receiving system; a chromatic aberration correcting element having almost no power disposed between the objective lens and the beam splitter and adapted to correct a chromatic aberration of the objective lens; and means for independently actuating the objective lens at least in an optical axis direction thereof.
Inventors
- 👤 Koichi Maruyama
- 👤 Makoto Iwaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:33
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/135; G11B7/1372; G02; G02B; G02B27/00; G02B27/0025; G11B7/1378; G11B7/1392; G11B7/13922
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
158 words
An optical system of an optical information recording/reproducing apparatus including: a light source for emitting divergent luminous flux; a collimator lens for collimating the luminous flux emitted from said light source; an objective lens for converging the luminous flux emitted from said light source onto a medium; a beam splitter for splitting the luminous flux reflected by said medium from a light path directed to the light source and guiding the luminous flux to a light receiving system; a chromatic aberration correcting element having substantially no power disposed between said objective lens and said beam splitter and adapted to correct a chromatic aberration of said objective lens; and means for independently actuating said objective lens at least in an optical axis direction defined by said objective lens; said chromatic aberration correcting element comprising a positive lens and a negative lens cemented together, each end face of said chromatic aberration correcting element being formed with a generally planar surface.
Claim 2
Dependent Claim
158 words
An optical system of an optical information recording/reproducing apparatus including: a light source for emitting divergent luminous flux; a collimator lens for collimating the luminous flux emitted from said light source; an objective lens for converging the luminous flux emitted from said light source onto a medium; a beam splitter for splitting the luminous flux reflected by said medium from a light path directed to the light source and guiding the luminous flux to a light receiving system; a chromatic aberration correcting element having substantially no power disposed between said objective lens and said beam splitter and adapted to correct a chromatic aberration of said objective lens; and means for independently actuating said objective lens at least in an optical axis direction defined by said objective lens; said chromatic aberration correcting element comprising a positive lens and a negative lens cemented together, each end face of said chromatic aberration correcting element being formed with a generally planar surface.
Claim 3
Dependent Claim
37 words
An optical system of an optical information recording/reproducing apparatus of claim 1, wherein said actuating means independently actuates said objective lens in said optical axis direction and in the vertical direction with respect to said optical axis.
Claim 4
Dependent Claim
40 words
An optical system of an optical information recording/reproducing apparatus of claim 1, which further includes a head moved with respect to said medium, and in which said objective lens and said chromatic aberration correcting element are disposed on said head.
Claim 5
Dependent Claim
37 words
An optical system of an optical information recording/reproducing apparatus of claim 3, wherein said actuating means independently actuates said objective lens in said optical axis direction and in the vertical direction with respect to said optical axis.
Claim 6
Dependent Claim
45 words
An optical system of an optical information recording/reproducing apparatus of claim 1, which further includes a head moved with respect to said medium and in which said objective lens is disposed on said head and said chromatic aberration correcting element is disposed outside said head.
Claim 7
Dependent Claim
36 words
An optical system of an optical information recording/reproducing apparatus of claim 5, wherein said actuating means independently actuates said objective lens in said optical axis and in the vertical direction with respect to said optical axis.
Claim 8
Dependent Claim
51 words
An optical system of an optical information recording/reproducing apparatus of claim 1, which further includes a head moved with respect to said medium and in which said light source portion, said objective lens, said chromatic aberration correcting element, said light receiving system and said beam splitter are disposed within said head.
Claim 9
Dependent Claim
36 words
An optical system of an optical information recording/reproducing apparatus of claim 7 wherein said actuating means independently actuates said objective lens in said optical axis and in the vertical direction with respect to said optical axis.
Claim 10
Dependent Claim
32 words
An optical system of an optical information recording/reproducing apparatus of claim 1, wherein said objective lens and said chromatic aberration correcting element are independently corrected in aberrations other than the chromatic aberration.
Claim 11
Dependent Claim
25 words
The optical system of an optical information recording/reproducing apparatus according to claim 1, said chromatic aberration correcting element being movable independently of said collimator lens.
Claim 12
Dependent Claim
62 words
An optical system of an optical information recording/reproducing apparatus according to claim 1, said chromatic aberration correcting element satisfying the following relation: |n.sub.p -n.sub.n |×10.sup.5 <300 where n p is the refractive index of a positive lens in a center of a wavelength used; and n n is the refractive index of a negative lens in a center of a wavelength used.
Claim 13
Dependent Claim
92 words
An objective optical system of an optical information recording/reproducing apparatus including: an objective lens for converging a generally parallel luminous flux; a chromatic aberration correcting element having substantially no power for correcting a chromatic aberration of said objective lens; and means for independently actuating said objective lens at least in an optical axis direction defined by said objective lens; said chromatic aberration correcting element being formed of a positive lens and a negative lens cemented together, each end face of said chromatic aberration correcting element being formed as a generally planar surface.
Claim 14
Dependent Claim
92 words
An objective optical system of an optical information recording/reproducing apparatus including: an objective lens for converging a generally parallel luminous flux; a chromatic aberration correcting element having substantially no power for correcting a chromatic aberration of said objective lens; and means for independently actuating said objective lens at least in an optical axis direction defined by said objective lens; said chromatic aberration correcting element being formed of a positive lens and a negative lens cemented together, each end face of said chromatic aberration correcting element being formed as a generally planar surface.
Claim 15
Dependent Claim
38 words
An objective optical system of an optical information recording/reproducing apparatus of claim 12, wherein said actuating means independently actuates said objective lens in the optical axis direction and in the vertical direction with respect to said optical axis.
Claim 16
Dependent Claim
33 words
An objective optical system of an optical information recording/reproducing apparatus of claim 12, wherein said objective lens and said chromatic aberration correcting element are independently corrected in aberrations other than the chromatic aberration.
Claim 17
Dependent Claim
38 words
The objective optical system of an optical information recording/reproducing apparatus according to claim 12, further comprising a head movable with respect to a medium, said objective lens and said chromatic aberration correcting element being disposed on said head.
Claim 18
Dependent Claim
62 words
The optical system of an optical information recording/reproducing apparatus according to claim 12, said chromatic aberration correcting element satisfying the following relation: |n.sub.p -n.sub.n |×10.sup.5 <300 where n p is the refractive index of a positive lens in a center of a wavelength used; and n n is the refractive index of a negative lens in a center of a wavelength used.
References Cited (Backward Citations)
DE3237645A1
Cited
JPS5872114A
Cited
US4484803A
Cited
JPS59743A
Cited
EP0123048A1
Cited
US4572623A
Cited
US4557564A
Cited
JPS60232519A
Cited
US4753524A
Cited
US4721373A
Cited
JPS62267933A
Cited
JPS62269922A
Cited
US4909616A
Cited
JPS6310118A
Cited
JPS6320735A
Cited
US4791625A
Cited
US4976526A
Cited
JPH06235311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-06-13 | 1997-12-13 | 1998-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-13 | 2001-12-13 | 2002-06-14 | $3760.00 | Window Closed / Lapsed |
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