Patent US5479296A successfully refreshed from Google Patents.
US5479296A
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US
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Optical system of optical information recording/reproducing apparatus
Assignee: Pentax Corp
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Filing: 1994-03-11
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Granted: 1995-12-26
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Expires: 2014-03-11
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 said light source portion a medium; a beam splitter for splitting the luminous flux reflected by said medium from a light path directed to the light source portion and guiding the same to a light receiving system; a chromatic aberration correcting element having almost 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 thereof.
Inventors
- 👤 Koichi Maruyana
- 👤 Makoto Iwaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:07
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: 17
Claim 1
Independent Claim
138 words
An optical system of an optical information recording/reproducing apparatus including: a light source for emitting divergent luminous flux; 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; and a chromatic aberration correcting element having substantially no power, said chromatic aberration correcting element positioned between said objective lens and said beam splitter, said chromatic aberration correcting element comprising means for correcting a chromatic aberration of said objective lens; said chromatic aberration correcting element being formed of a positive lens and a negative lens cemented together, said negative and said positive lens having substantially the same refractive index and different Abbe's number.
Claim 2
Dependent Claim
138 words
An optical system of an optical information recording/reproducing apparatus including: a light source for emitting divergent luminous flux; 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; and a chromatic aberration correcting element having substantially no power, said chromatic aberration correcting element positioned between said objective lens and said beam splitter, said chromatic aberration correcting element comprising means for correcting a chromatic aberration of said objective lens; said chromatic aberration correcting element being formed of a positive lens and a negative lens cemented together, said negative and said positive lens having substantially the same refractive index and different Abbe's number.
Claim 3
Dependent Claim
30 words
The optical system of an optical information recording/reproducing apparatus according to claim 1, wherein each end face of said chromatic aberration correcting element is formed as a generally planar surface.
Claim 4
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 5
Dependent Claim
27 words
The optical system of an optical information recording/reproducing apparatus according to claim 1, further comprising a collimator lens for collimating the luminous flux of said light source.
Claim 6
Dependent Claim
29 words
The optical system of an optical information recording/reproducing apparatus according to claim 4, said chromatic aberration correcting element positioned for correcting chromatic aberration of a generally parallel luminous flux.
Claim 7
Dependent Claim
30 words
The optical system of an optical information recording/reproducing apparatus according to claim 4, said chromatic aberration correcting element comprising means for correcting chromatic aberration of a generally parallel luminous flux.
Claim 8
Dependent Claim
30 words
The optical system of an optical information recording/reproducing apparatus according to claim 1, further comprising means for mounting said objective lens and said chromatic aberration correcting element for movement together.
Claim 9
Dependent Claim
31 words
The optical system of an optical information recording/reproducing apparatus according to claim 1, further comprising means for mounting said objective lens for movement with respect to said chromatic aberration correcting element.
Claim 10
Dependent Claim
72 words
An optical system of an optical information recording/reproducing apparatus including: an objective lens for converging a generally parallel luminous flux; and a chromatic aberration correcting element having substantially no power for correcting chromatic aberration of said objective lens; said chromatic aberration correcting element is formed of a positive lens and a negative lens cemented together, said negative lens and said positive lens having substantially the same refractive index and different Abbe's number.
Claim 11
Dependent Claim
72 words
An optical system of an optical information recording/reproducing apparatus including: an objective lens for converging a generally parallel luminous flux; and a chromatic aberration correcting element having substantially no power for correcting chromatic aberration of said objective lens; said chromatic aberration correcting element is formed of a positive lens and a negative lens cemented together, said negative lens and said positive lens having substantially the same refractive index and different Abbe's number.
Claim 12
Dependent Claim
30 words
The optical system of an optical information recording/reproducing apparatus according to claim 9, wherein each end face of said chromatic aberration correcting element is formed as a generally planar surface.
Claim 13
Dependent Claim
62 words
The optical system of an optical information recording/reproducing apparatus according to claim 9, 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 14
Dependent Claim
29 words
The optical system of an optical information recording/reproducing apparatus according to claim 9, further comprising a collimator lens for providing the generally parallel luminous flux to said objective lens.
Claim 15
Dependent Claim
29 words
The optical system of an optical information recording/reproducing apparatus according to claim 9, said chromatic aberration correcting element provided for correcting chromatic aberration of the generally parallel luminous flux.
Claim 16
Dependent Claim
30 words
The optical system of an optical information recording/reproducing apparatus according to claim 9, further comprising means for mounting said objective lens and said chromatic aberration correcting element for movement together.
Claim 17
Dependent Claim
31 words
The optical system of an optical information recording/reproducing apparatus according to claim 9, further comprising means for mounting said objective lens for movement with respect to said chromatic aberration correcting element.
References Cited (Backward Citations)
DE3237645A1
Cited
JPS5872114A
Cited
US4484803A
Cited
JPS5960743A
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 |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-25 | 1999-06-26 | 1999-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-25 | 2003-06-26 | 2003-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-25 | 2007-06-26 | 2007-12-26 | $7700.00 | Window Closed / Lapsed |