US3837726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera for making holograms
Assignee: Fujinon Corp
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Filing: 1973-11-05
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Granted: 1974-09-24
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Expires: 1993-11-05
Abstract
Abstract A camera for making a hologram is provided with a device for varying the optical path length of the object light or the reference light. The camera includes a range finder to measure the distance from the camera to the object to be recorded on the hologram. The range finder has a rotatable mirror which is rotated to determine the distance. The rotatable mirror is associated with the device for varying the optical path length of the object light or the reference light so that the optical path length of the light may be varied according to the distance of the object to be recorded on the hologram. Both the object light and the reference light may be provided with the optical path length varying device so that the optical path length of one of the lights may be shortened and that of the other may be lengthened.
Inventors
- 👤 M Suzuki
- 👤 M Kanaya
- 👤 K Seki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:42
CPC Classifications
G; G03; G03H; G03H1/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
198 words
A camera for making a hologram comprising a camera housing having an opening, a coherent light source provided in the housing, a beam splitter provided in front of the light source for dividing the light from the source into reference light and object light, a first optical system for guiding the object light toward an object located outside said housing through said opening, a second optical system for guiding the reference light toward a photographic film located in the housing to record a hologram thereon, said photographic film receiving light reflected by said object and coming into the housing through said opening to record thereon a hologram of said object, an optical path length varying means provided in the optical path of at least one of said reference light and said object light, a range finder provided in the housing including a movable optical element which is moved to determine the distance of said object from the film, and means for associating said optical path length varying means with said movable optical element in the range finder so that the optical path length varying means may be operated in association with the movement of said movable optical element.
Claim 2
Dependent Claim
198 words
A camera for making a hologram comprising a camera housing having an opening, a coherent light source provided in the housing, a beam splitter provided in front of the light source for dividing the light from the source into reference light and object light, a first optical system for guiding the object light toward an object located outside said housing through said opening, a second optical system for guiding the reference light toward a photographic film located in the housing to record a hologram thereon, said photographic film receiving light reflected by said object and coming into the housing through said opening to record thereon a hologram of said object, an optical path length varying means provided in the optical path of at least one of said reference light and said object light, a range finder provided in the housing including a movable optical element which is moved to determine the distance of said object from the film, and means for associating said optical path length varying means with said movable optical element in the range finder so that the optical path length varying means may be operated in association with the movement of said movable optical element.
Claim 3
Dependent Claim
28 words
A camera for making a hologram as defined in claim 1 wherein said optical path length varying means is provided in the optical path of the reference light.
Claim 4
Dependent Claim
28 words
A camera for making a hologram as defined in claim 1 wherein said optical path length varying means is provided in the optical path of the object light.
Claim 5
Dependent Claim
99 words
A holography camera as defined in claim 1 wherein both the reference light path and the object light path are provided with the optical path length varying means, the two optical path length varying means are operated in the opposite directions respectively, whereby one of the light path is lengthened while the other optical path is shortened in association with the movement of said movable optical element. 5.A holography camera as defined in claim 1 wherein said optical path length varying means is associated with a manually operable mechanism for moving said movable optical element of the range finder.
Claim 6
Dependent Claim
50 words
A holography camera as defined in claim 5 wherein said manually operable mechanism comprises a knob provided on the wall of the camera housing, a gear mechanism associated with the knob to transmit the rotation of the knob to said movable optical element and said optical path length varying means.
Claim 7
Dependent Claim
36 words
A holography camera as defined in claim 5 wherein said movable optical element is a rotatable mirror for determining the field angle of the object to measure the distance of the object from the photographic film.
Claim 8
Dependent Claim
72 words
A holography camera as defined in claim 5 wherein said optical path length varying means comprises a movable stage associated with said manually operable mechanism and at least one totally reflecting Porro prism mounted on said movable stage for reflecting the light reflected by a stationary mirror provided in the light path back to the path, said Porro prism being movable in the direction of the light reflected by said stationary mirror.
Claim 9
Dependent Claim
40 words
A holography camera as defined in claim 8 wherein said movable stage is mechanically associated with a gear train which includes a gear operatively fixed to said optical element, and said gear is manually operable from outside said camera housing.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |