Patent US4401352A successfully refreshed from Google Patents.
US4153333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical fiber bundle with field stop
Assignee: Fujinon Corp
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Filing: 1977-02-23
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Granted: 1979-05-08
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Expires: 1997-02-23
Abstract
Abstract An image transmitting optical fiber bundle has at an end of it a field stop for defining the size of image viewed thereby. The field stop is sandwiched between a pair of transparent thin plastic films. The pair of films which sandwiches the field stop is fixed to an end of the optical fiber bundle. A face plate is further fixed on the pair of films on the end face of the fiber bundle. Since the surfaces adhered are all flat, the formation of bubbles in the adhesive is easily precluded.
Inventors
- 👤 Yuho Harada
- 👤 Kenzo Hiramatu
- 👤 Katsuhito Hasegawa
- 👤 Kuniaki Ishibashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:23
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/04; G02B6/06; G02B5/00; G02B5/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
In an optical fiber bundle comprising a stack of optical fibers an end of which is precisely polished to provide a flat end face, a face plate having a flat surface and made of transparent material fixed to said end face of the optical fibers, and a field stop fixed between said end face of the optical fibers and said face plate, the improvement which comprises a pair of transparent films sandwiching said field stop therebetween and fixed to said field stop by means of an adhesive, one of said pair of transparent films being fixed between said end face of the optical fibers and said field stop by means of an adhesive.
Claim 2
Dependent Claim
113 words
In an optical fiber bundle comprising a stack of optical fibers an end of which is precisely polished to provide a flat end face, a face plate having a flat surface and made of transparent material fixed to said end face of the optical fibers, and a field stop fixed between said end face of the optical fibers and said face plate, the improvement which comprises a pair of transparent films sandwiching said field stop therebetween and fixed to said field stop by means of an adhesive, one of said pair of transparent films being fixed between said end face of the optical fibers and said field stop by means of an adhesive.
Claim 3
Dependent Claim
60 words
An optical fiber bundle as defined in claim 1 wherein said end of the optical fibers is sealed in a rigid sleeve, and the end face of the optical fibers and the end face of the rigid sleeve are polished together to provide a flat end face on which said pair of transparent films sandwiching said field stop is fixed.
Claim 4
Dependent Claim
106 words
An optical fiber bundle comprising a stack of optical fibers an end of which is precisely polished to provide a flat end face, a face plate having a flat surface and made of transparent material, and a field stop having one side fixed to said flat surface of said face plate, the improvement which comprises a film fixed by adhesive to the other side of said field stop and fixed to said flat end face of said optical fibers by adhesive whereby the formation of bubbles at the ends of said optical fibers is prevented and said face plate is rigidly attached to said field stop.
Claim 5
Dependent Claim
106 words
An optical fiber bundle comprising a stack of optical fibers an end of which is precisely polished to provide a flat end face, a face plate having a flat surface and made of transparent material, and a field stop having one side fixed to said flat surface of said face plate, the improvement which comprises a film fixed by adhesive to the other side of said field stop and fixed to said flat end face of said optical fibers by adhesive whereby the formation of bubbles at the ends of said optical fibers is prevented and said face plate is rigidly attached to said field stop.
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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) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |