US4987884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic endoscope
Assignee: Olympus Corp
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Filing: 1989-05-16
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Granted: 1991-01-29
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Expires: 2009-05-16
Abstract
Abstract An electronic endoscope using a solid-state image pickup device has a filter arranged in the foreground of the solid-state image pickup device within the body of the endoscope for removing lights having wavelengths not related to observation in order to effectively eliminate those light components which are not required for the observation from among those lights incident to the solid-state image pickup device. As such a filter, either a lens component constituting the objective lens or an illuminating lens can be used.
Inventors
- 👤 Kimihiko Nishioka
- 👤 Hisao Ogiu
- 👤 Tatsuo Nagasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:27
CPC Classifications
A; A61; A61B; A61B1/00; A61B1/04; A61B1/05
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
An electronic endoscope comprising: illuminating means for radiating light toward an object, said illuminating means comprising: a light source for generating said light, at least one infrared ray removing filter means having a first spectral transmittance for filtering light having a wavelength of 690 to 950 nm, and means for guiding said filtered light toward said object; and image pickup means for imaging light reflected from said object, said image pickup means comprising: objective lens unit means for focussing said light, and heat ray absorbing filter means having a second spectral transmittance for filtering light having a wavelength of 950 to 1100 nm so that, as a whole, said infrared ray removing filter means and said heat ray absorbing filter means remove infrared rays and YAG laser beams ranging in wavelength from 690 to 1100 nm.
Claim 2
Dependent Claim
136 words
An electronic endoscope comprising: illuminating means for radiating light toward an object, said illuminating means comprising: a light source for generating said light, at least one infrared ray removing filter means having a first spectral transmittance for filtering light having a wavelength of 690 to 950 nm, and means for guiding said filtered light toward said object; and image pickup means for imaging light reflected from said object, said image pickup means comprising: objective lens unit means for focussing said light, and heat ray absorbing filter means having a second spectral transmittance for filtering light having a wavelength of 950 to 1100 nm so that, as a whole, said infrared ray removing filter means and said heat ray absorbing filter means remove infrared rays and YAG laser beams ranging in wavelength from 690 to 1100 nm.
Claim 3
Dependent Claim
39 words
An electronic endoscope according to claim 1 wherein said objective lens unit means comprises a stop, a negative lens on an object side of said stop, and at least two positive lenses on an image side of said stop.
Claim 4
Dependent Claim
32 words
An electronic endoscope according to claim 2 wherein said heatray absorbing filter means is a prism disposed in said objective lens unit means between said negative lens and said two positive lenses.
Claim 5
Dependent Claim
24 words
An electronic endoscope according to claim 2, wherein said heat ray absorbing filter means is formed as one of said positive and negative lenses.
Claim 6
Dependent Claim
35 words
An electronic endoscope according to claim 2, wherein said image pickup means comprises a solid-state image pickup device, and said heat ray absorbing filter and said image pickup device are arranged in mutually spaced relation.
Claim 7
Dependent Claim
35 words
An electronic endoscope according to claim 1, wherein said image pickup means comprises a solid-state image pickup device, and said heat ray absorbing filter and said image pickup device are arranged in mutually spaced relation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |