Patent US4000454A successfully refreshed from Google Patents.
US3655259A
Expired / Lapsed
US
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Streoscopic microscope with graded index fiber objective lenses
Assignee: Nippon Selfoc Co Ltd
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Filing: 1969-08-22
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Granted: 1972-04-11
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Expires: 1989-08-22
Abstract
Abstract The disclosure relates to an optical image transmitting apparatus adapted for a viewfinder for observation of any object, wherein two systems of transparent structures are provided whose refractive index distribution in each cross section perpendicular to the center axis is reduced nearly in proportion to a square of a distance from the center axis, said transparent structures consisting of rod-like or fibrous substance and being disposed so as to view any article stereoscopically; a viewfinder for medical observation wherein said transparent structures cable of transmitting an optical image therethrough and an optical fiber boundle for transmitting an illumination light to illuminate the article to be the observed are provided in a cavity portion of the inside of a hollow needle such as a hypodermic syringe; a microscope wherein said fibrous transparent structures are used as the object lens; and the like.
Inventors
- 👤 Tsuneshige Miyauchi
- 👤 Jiro Hirano
- 👤 Atsufumi Ueki
- 👤 Ryuji Tatsumi
- 👤 Kunihiro Mukai
- 👤 Shogo Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:06
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/24; G02B23/2407; G02B23/2415; G02B21/00; G02B21/18; G02B21/20; G02B21/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
A stereoscopic microscope comprising two ocular lenses spaced from one another to accommodate a viewer''s eyes and two transparent fiber structures constituting objective lenses and image transmitting passages, upper ends of said fiber structures having flat end faces optically aligned with said ocular lenses, and intermediate portions of said fiber structures being curved in toward one another so that lower end portions are close together, said lower end portions having flat faces directed toward an object to be viewed without objective lenses between said lower end faces and said object, each said fiber structure having a refractive index distribution in which the refractive index is greatest at the center axis of said structure and decreases toward the periphery substantially in proportion to the square of the distance from the center axis and substantially satisfying the equation n no(1-ar2) where no represents the refractive index at the center axis, n represents the refractive index at a radial distance r from said central axis and a is a positive constant, said fiber structures transmitting images of said object through said curved portions to said ocular lenses.
Claim 2
Dependent Claim
184 words
A stereoscopic microscope comprising two ocular lenses spaced from one another to accommodate a viewer''s eyes and two transparent fiber structures constituting objective lenses and image transmitting passages, upper ends of said fiber structures having flat end faces optically aligned with said ocular lenses, and intermediate portions of said fiber structures being curved in toward one another so that lower end portions are close together, said lower end portions having flat faces directed toward an object to be viewed without objective lenses between said lower end faces and said object, each said fiber structure having a refractive index distribution in which the refractive index is greatest at the center axis of said structure and decreases toward the periphery substantially in proportion to the square of the distance from the center axis and substantially satisfying the equation n no(1-ar2) where no represents the refractive index at the center axis, n represents the refractive index at a radial distance r from said central axis and a is a positive constant, said fiber structures transmitting images of said object through said curved portions to said ocular lenses.
Claim 3
Dependent Claim
40 words
A stereoscopic microscope as claimed in claim 1, wherein the lower ends of said fiber structures directed toward the object to be viewed are arranged so that the extension lines of said center axes cross at an angle of 12*.
Claim 4
Dependent Claim
44 words
A stereoscopic microscope as claimed in claim 1, wherein said transparent fiber structures are flexible and said lower end portions are movable relative to said upper ends to adjust the position of said lower end portions and the direction in which they are directed.
Claim 5
Dependent Claim
19 words
A stereoscopic microscope as claimed in claim 1, wherein said fiber structures have a diameter less than 2 mm.
Claim 6
Dependent Claim
21 words
A stereoscopic microscope as claimed in claim 1, wherein the surfaces of said transparent fiber structures are coated with opaque material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |