US4523801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning optical system subjected to a moisture proof treatment
Assignee: Canon Inc
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Filing: 1982-02-24
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Granted: 1985-06-18
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Expires: 2002-02-24
Abstract
Abstract An optical system for scanning a medium with a beam spot includes a light beam generator, a deflector for deflecting the light beam in a predetermined direction and in deflection plane, and an imaging optical system between the deflector and the medium for imaging the light beam from the deflector on the medium as a beam spot, the imaging optical system having at least one lens element mode of a moisture absorbing material. The lens element has a shape in which the dimension in a direction parallel to the deflection plane of the light beam is greater than the dimension in a direction perpendicular to the deflection plane of the light beam. A device mitigates any influence on the imaged condition of the light beam on the medium caused by the lens element being subjected to moisture.
Inventors
- 👤 Takeshi Baba
- 👤 Noriyuki Nose
- 👤 Hideo Yoshikawa
- 👤 Kazuo Minoura
- 👤 Akinori Hasu
- 👤 Setsuo Minami
- 👤 Kazuhiko Matsuoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:44
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/12; G02B1/00; G02B1/10; G02B1/12; G02B3/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
187 words
An optical system for scanning a medium with a beam spot, said optical system comprising: means for supplying a light beam; means for deflecting the light beam from said light beam supplying means in a predetermined direction and in a deflection plane; means disposed between said deflecting means and said medium for imaging the light beam from said deflecting means on said medium as a beam spot, said imaging means having at least one lens element made of a moisture absorbing material the refractive index of which varies with the amount of moisture absorbed, said lens element having a shape in which the length in a direction parallel to the deflection plane of the light beam is greater than the length in a direction orthogonal to the deflection plane of the light beam; and means for mitigating the influence on the imaged condition of the light beam on the medium resulting from said lens element being subjected to moisture, said mitigating means including a moisture proof member provided only on the portion of the surface of said lens element through which the light beam does not pass.
Claim 2
Dependent Claim
187 words
An optical system for scanning a medium with a beam spot, said optical system comprising: means for supplying a light beam; means for deflecting the light beam from said light beam supplying means in a predetermined direction and in a deflection plane; means disposed between said deflecting means and said medium for imaging the light beam from said deflecting means on said medium as a beam spot, said imaging means having at least one lens element made of a moisture absorbing material the refractive index of which varies with the amount of moisture absorbed, said lens element having a shape in which the length in a direction parallel to the deflection plane of the light beam is greater than the length in a direction orthogonal to the deflection plane of the light beam; and means for mitigating the influence on the imaged condition of the light beam on the medium resulting from said lens element being subjected to moisture, said mitigating means including a moisture proof member provided only on the portion of the surface of said lens element through which the light beam does not pass.
Claim 3
Dependent Claim
15 words
An optical system according to claim 1, wherein said lens element is a plastic lens.
Claim 4
Dependent Claim
14 words
An optical system according to claim 1, wherein said moisture proof member is wax.
Claim 5
Dependent Claim
15 words
An optical system according to claim 1, wherein said moisture proof member is metal foil.
Claim 6
Dependent Claim
183 words
An optical system for scanning a medium with a beam spot, said optical system comprising: means for supplying a light beam; means for deflecting the light beam from said light beam supplying means in a predetermined direction and in a deflection plane; means disposed between said deflecting means and said medium for imaging the light beam from said deflecting means on said medium as a beam spot, said imaging means having at least one lens element having a non-lens surface and being made of a moisture absorbing material the refractive index of which varies with the amount of moisture absorbed, said lens element having a shape in which the length in a direction parallel to the deflection plane of the light beam is greater than the length in a direction orthogonal to the deflection plane of the light beam; and means for mitigating the influence on the imaged condition of the light beam on the medium resulting from said lens element being subjected to moisture, said mitigating means including a moisture proof member provided only on said non-lens surface of said lens element.
Claim 7
Dependent Claim
183 words
An optical system for scanning a medium with a beam spot, said optical system comprising: means for supplying a light beam; means for deflecting the light beam from said light beam supplying means in a predetermined direction and in a deflection plane; means disposed between said deflecting means and said medium for imaging the light beam from said deflecting means on said medium as a beam spot, said imaging means having at least one lens element having a non-lens surface and being made of a moisture absorbing material the refractive index of which varies with the amount of moisture absorbed, said lens element having a shape in which the length in a direction parallel to the deflection plane of the light beam is greater than the length in a direction orthogonal to the deflection plane of the light beam; and means for mitigating the influence on the imaged condition of the light beam on the medium resulting from said lens element being subjected to moisture, said mitigating means including a moisture proof member provided only on said non-lens surface of said lens element.
References Cited (Backward Citations)
US3109097A
Cited
US3622218A
Cited
US3750189A
Cited
US3883214A
Cited
DE2353296A1
Cited
US4379612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |