Patent US3391518A successfully refreshed from Google Patents.
US3661065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for optical focusing a glass fiber plate as a focusing screen
Assignee: Individual
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Filing: 1969-02-06
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Granted: 1972-05-09
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Expires: 1989-02-06
Abstract
Abstract In an optical focusing system as in a finder optical system of a reflex camera or in an optical focusing system wherein an image on the focusing screen disposed on the focal plane is observed from the back of said screen whereby the focusing condition of the image forming optical system can be detected, the present invention relates to a device for optical focusing, utilizing a glass fiber focusing plate as a focusing screen, which is characterized in that said focusing screen is provided with an incident end face of an optical fiber plate composed of many optical fibers secured with one another in a parallel array. In order to observe through the light ray passing through the circumferential portion of the lens of the image-forming optical system, which comes into said incident end face, it is possible to observe at a position away from the optical axis of said image-forming optical system, on the back of said optical fiber plate.
Inventors
- 👤 Yasuo Yamazaki
- 👤 Mitsuo Furuta
- 👤 Yoshio Kuramoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:14
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12; G02; G02B; G02B27/00; G02B27/40; G02B7/00; G02B7/02; G02B7/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
124 words
An image-forming optical system, comprising a lightconverging means for forming images on an image plane, an optical fiber plate composed of single fibers secured to one another to form a parallel array, said fiber plate being so disposed such that one side thereof is coincident with the image plane, an optical biasing means disposed on the back of said fiber plate so that directions of light rays emitted from the fiber plate may be biased, a viewing part disposed at the position which is behind said biasing means in such manner that the optical axis of said viewing part is not coincident with a light ray incident upon the optical axis of said converging means and passing through said plate and said biasing means.
Claim 2
Dependent Claim
124 words
An image-forming optical system, comprising a lightconverging means for forming images on an image plane, an optical fiber plate composed of single fibers secured to one another to form a parallel array, said fiber plate being so disposed such that one side thereof is coincident with the image plane, an optical biasing means disposed on the back of said fiber plate so that directions of light rays emitted from the fiber plate may be biased, a viewing part disposed at the position which is behind said biasing means in such manner that the optical axis of said viewing part is not coincident with a light ray incident upon the optical axis of said converging means and passing through said plate and said biasing means.
Claim 3
Dependent Claim
20 words
The image forming optical system as claimed in claim 1, wherein said optical biasing means comprises a wedge-shaped optical member.
Claim 4
Dependent Claim
18 words
The image-forming optical system as claimed in claim 1, wherein said optical biasing means comprises a modified pentaprism.
Claim 5
Dependent Claim
26 words
The image-forming optical system as claimed in claim 3, further including a wedge-shaped optical member to cooperate with said modified pentaprism for biasing the light rays.
Claim 6
Dependent Claim
27 words
The image-forming optical system as claimed in claim 3, wherein said eye-piece member is movable in a direction to cross the light rays emitted from said pentaprism.
Claim 7
Dependent Claim
146 words
In an optical focusing system as in a finder optical system of a reflex camera or in an optical focusing system wherein an image on the focusing screen disposed on the focal plane is observed from the back of said screen whereby the focusing condition of the image-forming optical system can be detected, comprising, a converging means an optical fiber plate serving as said focusing screen, said plate being composed of light-transmitting fibers secured to one another to form a parallel array, said fiber plate being so disposed that its one side will be made to coincide with said focal plane, and a viewing part disposed at a position which is behind said plate in such manner that the optical axis of said viewing part is not coincident with a light ray incident upon the optical axis of said converging means and passing through said plate.
Claim 8
Dependent Claim
146 words
In an optical focusing system as in a finder optical system of a reflex camera or in an optical focusing system wherein an image on the focusing screen disposed on the focal plane is observed from the back of said screen whereby the focusing condition of the image-forming optical system can be detected, comprising, a converging means an optical fiber plate serving as said focusing screen, said plate being composed of light-transmitting fibers secured to one another to form a parallel array, said fiber plate being so disposed that its one side will be made to coincide with said focal plane, and a viewing part disposed at a position which is behind said plate in such manner that the optical axis of said viewing part is not coincident with a light ray incident upon the optical axis of said converging means and passing through said plate.
Claim 9
Dependent Claim
60 words
The system according to claim 6 wherein both side planes of each said fiber of said fiber plate are parallel to one another and perpendicular to the longitudinal axes of said fibers, both sides of said fiber plate being parallel and perpendicular to the optical axis of said converging means, and the observing position being away from the optical axis.
Claim 10
Dependent Claim
39 words
The system according to claim 6 wherein said fibers of said fiber plate are provided with their longitudinal axes inclined at an oblique angle to the focal plane, both sides of said fiber plate being parallel to one another.
Claim 11
Dependent Claim
33 words
The system according to claim 6 wherein each said fiber of said fiber plate is slightly curved and the normals of both side planes of each said fiber are parallel to one another.
Claim 12
Dependent Claim
22 words
The system according to claim 6 wherein at least one side of said fiber plate is ground to produce a light-scattering plane.
Claim 13
Dependent Claim
147 words
In an optical focusing system as in a finder system of a reflex camera or in an optical focusing system wherein an image on the focusing screen disposed on the focal plane is observed from the back of said screen whereby the focusing condition of the image-forming optical system can be detected, comprising, a converging means for the system a wedge-shaped optical fiber means serving as said focusing screen, said fiber means being composed of light-transmitting fibers secured to one another to form a parallel array, said fiber means being so disposed that its one side coincides with said focal plane, and a viewing part disposed at a position which is behind said plate in such a manner that the optical axis of said viewing part is not coincident with a light ray incident upon the optical axis of said converging means and passing through said plate.
Claim 14
Dependent Claim
147 words
In an optical focusing system as in a finder system of a reflex camera or in an optical focusing system wherein an image on the focusing screen disposed on the focal plane is observed from the back of said screen whereby the focusing condition of the image-forming optical system can be detected, comprising, a converging means for the system a wedge-shaped optical fiber means serving as said focusing screen, said fiber means being composed of light-transmitting fibers secured to one another to form a parallel array, said fiber means being so disposed that its one side coincides with said focal plane, and a viewing part disposed at a position which is behind said plate in such a manner that the optical axis of said viewing part is not coincident with a light ray incident upon the optical axis of said converging means and passing through said plate.
Claim 15
Dependent Claim
38 words
The system according to claim 11 wherein said optical fiber means comprises a plate, a normal of at least one side of each of said fibers being out of parallelism with the longitudinal axis of each said fiber.
Claim 16
Dependent Claim
48 words
The system according to claim 11 wherein said optical fiber means comprises two wedge-shaped fiber plates, each of said plates being independently rotatable for changing the vertical angle embraced by the light-receiving surface of one of said plates and the light-emitting surface of the other of said plates.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |