Patent US6724740B1 successfully refreshed from Google Patents.
Patent US4027327A successfully refreshed from Google Patents.
US4027327A
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US
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View finder for reflex camera
Assignee: Fujinon Corp
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Filing: 1975-08-04
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Granted: 1977-05-31
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Expires: 1995-08-04
Abstract
Abstract A holographic lens which functions to converge light passing therethrough is located on a plane equivalent to the focal plane of a taking lens of a reflex camera. An image of the object is formed on the holographic lens and viewed in enlarged scale through an eyepiece. The light passing through the holographic lens is converged to the eyepiece so that a uniformly bright image of the object formed on the holographic lens may be viewed through the eyepiece.
Inventors
- 👤 Yuho Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:24
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A view finder for a reflex camera comprising a mirror located behind a taking lens of the camera to receive light passing through the taking lens and reflect the light, a holographic lens provided in said camera to receive the light reflected from said mirror and having a function to converge the light passing therethrough, said holographic lens being located substantially on a plane equivalent to the focal plane of the taking lens, and an eyepiece located optically behind said holographic lens to which the light from the holographic lens converges.
Claim 2
Dependent Claim
91 words
A view finder for a reflex camera comprising a mirror located behind a taking lens of the camera to receive light passing through the taking lens and reflect the light, a holographic lens provided in said camera to receive the light reflected from said mirror and having a function to converge the light passing therethrough, said holographic lens being located substantially on a plane equivalent to the focal plane of the taking lens, and an eyepiece located optically behind said holographic lens to which the light from the holographic lens converges.
Claim 3
Dependent Claim
26 words
A view finder for a reflex camera as defined in claim 1 wherein said holographic plate is provided with a prism for making a split image.
Claim 4
Dependent Claim
32 words
A view finder for a reflex camera as defined in claim 1 wherein said holographic lens is made of a photographic recording material and has sign or character information photographically recorded thereon.
Claim 5
Dependent Claim
36 words
A view finder for a reflex camera as defined in claim 1 further comprising a diffusion plate located on said plane equivalent to the focal plane of the taking lens in parallel to said holographic lens.
Claim 6
Dependent Claim
26 words
A view finder for a reflex camera as defined in claim 4 wherein said diffusion plate is provided with a prism for making a split image.
References Cited (Backward Citations)
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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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |