Patent US5876327A successfully refreshed from Google Patents.
US5876327A
Expired / Lapsed
US
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Imaging apparatus for endoscopes
Assignee: Olympus Corp
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Filing: 1997-09-03
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Granted: 1999-03-02
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Expires: 2017-09-03
Abstract
Abstract An imaging apparatus for endoscopes includes an endoscope relaying an object image through an observing optical system, and an imaging section removably mounted to the rearmost end of the endoscope, including a stop unit provided with a variable stop capable of changing an aperture size thereof, an imaging lens system, a focus lens system, and an image sensor. The relative positions of the variable stop, the imaging lens system, and the image sensor are constant, and the focus lens system can be moved along the optical axis of the imaging section. In this way, the imaging apparatus for endoscopes can be provided which is simple in structure, small in size, and low in cost.
Inventors
- 👤 Hiroshi Tsuyuki
- 👤 Masami Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:29
CPC Classifications
A; A61; A61B; A61B1/00; A61B1/00163; A61B1/00188; A61B1/00064; A61B1/00071; A61B1/0008; A61B1/00096; A61B1/00195; A61B1/04; A61B1/042
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
87 words
An imaging apparatus for endoscope comprising: an endoscope relaying an object image through an observing optical system; and an imaging section removably mounted to a rearmost end of said endoscope, including a stop unit provided with a variable stop whose aperture size is variable, an imaging lens system, a focus lens system, and an image sensor, relative positions of said variable stop, said imaging lens system, and said image sensor being constant, and said focus lens system being movable along an optical axis of said imaging section.
Claim 2
Dependent Claim
87 words
An imaging apparatus for endoscope comprising: an endoscope relaying an object image through an observing optical system; and an imaging section removably mounted to a rearmost end of said endoscope, including a stop unit provided with a variable stop whose aperture size is variable, an imaging lens system, a focus lens system, and an image sensor, relative positions of said variable stop, said imaging lens system, and said image sensor being constant, and said focus lens system being movable along an optical axis of said imaging section.
Claim 3
Dependent Claim
20 words
An imaging apparatus for endoscopes according to claim 1, wherein said imaging lens system is held in said stop unit.
Claim 4
Dependent Claim
32 words
An imaging apparatus for endoscopes according to claim 2, wherein said focus lens system is held in a focus lens frame, and said stop unit is fitted into said focus lens frame.
Claim 5
Dependent Claim
35 words
An imaging apparatus for endoscopes according to claim 3, wherein said focus lens frame is provided with a through-hole for a signal line transmitting a signal for controlling the aperture size of said variable stop.
Claim 6
Dependent Claim
30 words
An imaging apparatus for endoscopes according to claim 4, wherein a minimum outside diameter of said focus lens system is equal to an outside diameter of said imaging lens system.
Claim 7
Dependent Claim
18 words
An imaging apparatus for endoscopes according to claim 5, wherein said focus lens system includes a single lens.
Claim 8
Dependent Claim
20 words
An imaging apparatus for endoscopes according to claim 6, wherein said imaging lens system includes at least one cemented lens.
Claim 9
Dependent Claim
35 words
A n imaging apparatus for endoscopes according to claim 7, wherein a foremost lens of said imaging lens system has a positive power and said imaging lens system has a negative power as a whole.
Claim 10
Dependent Claim
42 words
An imaging apparatus for endoscopes according to claim 8, wherein the following condition is satisfied: 0.05<|f.sub.a /f.sub.o |<0.35 where f o is a focal length of said imaging lens system and f a is a focal length of said focus lens system.
Claim 11
Dependent Claim
56 words
An imaging apparatus for endoscopes according to claim 9, wherein a minimum aperture diameter φ of said variable stop satisfies the following condition: 1.5×10.sup.-4 f/Px≦φ≦7.32×10.sup.-3 Px/f where f is a total focal length of an optical system placed behind said variable stop and Px is a pixel pitch in a horizontal direction of said image sensor.
Claim 12
Dependent Claim
25 words
An imaging apparatus for endoscopes according to claim 10, wherein an optical member for correcting for spherical aberration is disposed close to said variable stop.
Claim 13
Dependent Claim
34 words
An imaging apparatus for endoscopes according to claim 11, wherein an actuation of opening and closing of said variable stop is associated with a movement of said focus lens system along an optical axis.
Claim 14
Dependent Claim
34 words
An imaging apparatus for endoscopes according to claim 12, wherein each of said endoscope and said imaging section is hermetically sealed through a member having resistance to water vapor of high temperature and pressure.
Claim 15
Dependent Claim
33 words
An imaging apparatus for endoscopes according to claim 13, wherein said imaging section further includes a color separation prism and image sensors corresponding to color light components divided by said color separation prism.
Claim 16
Dependent Claim
48 words
An imaging apparatus for endoscopes according to claim 2, wherein said imaging lens system and said focus lens system are held in an imaging lens frame and a focus lens frame, respectively, said imaging lens frame and said focus lens frame being held in a single lens barrel.
References Cited (Backward Citations)
US4685450A
Cited
US4697894A
Cited
US4987884A
Cited
US4777524A
Cited
US4916534A
Cited
US4868645A
Cited
US4967269A
Cited
US5101807A
Cited
US5179934A
Cited
US5056902A
Cited
US5150702A
Cited
US5159380A
Cited
US5222477A
Cited
US5609563A
Cited
JPH07234365A
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) | 2002-03-01 | 2002-08-31 | 2003-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-01 | 2006-08-31 | 2007-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-01 | 2010-08-31 | 2011-03-02 | $7700.00 | Window Closed / Lapsed |