Patent US3688673A successfully refreshed from Google Patents.
US3688673A
Expired / Lapsed
US
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Light receiving means in automatic focusing device
Assignee: Nikon Corp
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Filing: 1970-11-20
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Granted: 1972-09-05
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Expires: 1990-11-20
Abstract
Abstract A light receiving optical means in an automatic focusing device used in a camera includes an optical image multiplier member disposed in a light receiving path for dividing and deflecting a light beam from an object to be photographed, whereby plural images of the object are formed on a photo-conductive element forming the light receiving portion of the device to thereby produce an electrical output which will ensure automatic focusing.
Inventors
- 👤 Yoshihisa Katsuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:32
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
155 words
In an automatic focusing apparatus for optical instruments, comprising an objective lens for forming an image of the object; a photoconductive light receiving means disposed to receive the light passing through the objective lens from the object; the photoconductive light receiving means being divided into a number of divisions by a number of electrodes, each of said divisions thereby constituting discrete, photosensitive means which generate an electrical signal in response to the intensity of the light of the image which is formed thereon, and means for axially displacing the objective lens in response to said electrical signal to make a sharp image of the object on the photoconductive light receiving means; the improvement comprising means for dividing and deflecting the light beam passing through said objective lens in order to form plural images on the photoconductive light receiving means, the light dividing means being disposed between the objective lens and the photoconductive light receiving means.
Claim 2
Dependent Claim
155 words
In an automatic focusing apparatus for optical instruments, comprising an objective lens for forming an image of the object; a photoconductive light receiving means disposed to receive the light passing through the objective lens from the object; the photoconductive light receiving means being divided into a number of divisions by a number of electrodes, each of said divisions thereby constituting discrete, photosensitive means which generate an electrical signal in response to the intensity of the light of the image which is formed thereon, and means for axially displacing the objective lens in response to said electrical signal to make a sharp image of the object on the photoconductive light receiving means; the improvement comprising means for dividing and deflecting the light beam passing through said objective lens in order to form plural images on the photoconductive light receiving means, the light dividing means being disposed between the objective lens and the photoconductive light receiving means.
Claim 3
Dependent Claim
17 words
An apparatus as claimed in claim 1, wherein said dividing means includes a plurality of pyramidshaped prisms.
Claim 4
Dependent Claim
17 words
An apparatus as claimed in claim 1, wherein said dividing means includes a plurality of deformation lenses.
Claim 5
Dependent Claim
17 words
An apparatus as claimed in claim 1, wherein said dividing means includes a plurality of optical fibers.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |