Patent US3920320A successfully refreshed from Google Patents.
US3920320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projector for front projection photography
Assignee: LUMI TEK Inc
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Filing: 1974-04-19
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Granted: 1975-11-18
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Expires: 1994-04-19
Abstract
Abstract A projector includes a transparency holder for accurately aligning and positively positioning a transparency in front of a source of diffused light which transmits light of even intensity through all portions of the transparency. The light source includes a strobe lamp and a modeling lamp mounted within a broad beam reflector, and a light diffuser positioned between the lamps and the transparency holder. The light diffuser includes a dichroic filter for isolating the transparency from heat generated by the lamps, a mirrored light passageway and a ground glass covering the outlet end of the passageway. The light which permeates the transparency is reflected upwardly by an adjustably mounted mirror to a second mirror which directs the light toward a projection screen. A lens with a diaphragm is included in the light path between the two mirrors to adjust the amount of light projected toward the projection screen. The second-mentioned mirror is mounted on the exterior of the projector and is constituted by a beam splitting mirror which is permeated by light received in the reverse direction from the screen and from a subject positioned in front of the screen. A camera mount is provided behind the beam splitting mirror for photographing the composite scene in accordance with the reflected light which permeates the beam splitting mirror. The camera mount and the beam splitting mirror are mounted on a removable plate for replacement by a similar plate-mirror-mount structure adapted to receive a different camera. The camera mount is adjustable to predetermined positions along the length of the projector so that lenses of different focal length may be utilized by a camera attached to the camera mount.
Inventors
- 👤 Donovan K Ellis
- 👤 William P Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:21
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/08; G03B15/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
A projector for projecting an image onto a screen, comprising: a housing; a holder mounted in said housing for holding a transparencY bearing an image to be projected onto the screen; a light diffuser mounted in said housing adjacent said holder to receive light and transmit the received light to the transparency as diffused light; a modeling light source in said housing for generating and transmitting modeling light to said diffuser; and a strobe light source in said housing for generating and transmitting a flash of light to said diffuser, said diffuser comprising a mirrored light passageway to receive light from said sources, a filter at the inlet of said light passageway to block rotation in the infrared portion of the light spectrum, and a ground glass plate at the outlet of said light passageway to direct diffused light to said holder.
Claim 2
Dependent Claim
142 words
A projector for projecting an image onto a screen, comprising: a housing; a holder mounted in said housing for holding a transparencY bearing an image to be projected onto the screen; a light diffuser mounted in said housing adjacent said holder to receive light and transmit the received light to the transparency as diffused light; a modeling light source in said housing for generating and transmitting modeling light to said diffuser; and a strobe light source in said housing for generating and transmitting a flash of light to said diffuser, said diffuser comprising a mirrored light passageway to receive light from said sources, a filter at the inlet of said light passageway to block rotation in the infrared portion of the light spectrum, and a ground glass plate at the outlet of said light passageway to direct diffused light to said holder.
Claim 3
Dependent Claim
34 words
A projector according to claim 1, comprising: a reflector having a squared U-shape mounted in said housing, said modeling and strobe light sources each including a lamp mounted within the legs of the U.
Claim 4
Dependent Claim
25 words
A projector according to claim 1, wherein said holdler comprises means for accurately aligning and positively positioning a transparency with respect to said light diffuser.
Claim 5
Dependent Claim
13 words
A projector according to claim 1, wherein sid filter comprises a dichroic plate.
Claim 6
Dependent Claim
87 words
A projector according to claim 1, comprising: a first mirror mounted in said housing to direct light received along a first path from the transparency substantially perpendicular to the direction of said first path; a second mirror mounted on the exterior of the housing to direct light received from said first mirror along a second path parallel to said first path; and diaphragm means mounted on said housing between said first and second mirrors for adjusting the light passing from said first mirror to said second mirror.
Claim 7
Dependent Claim
23 words
A projector according to claim 5, wherein said second mirror is permeable to light received in the opposite direction along said second path.
Claim 8
Dependent Claim
37 words
A projector according to claim 5, comprising: adjustable mirror mounting means mounting said first mirror including means for varying the angle of said first mirror with respect to the direction of light received by said first mirror.
Claim 9
Dependent Claim
246 words
A projector for projecting an image onto a screen, comprising: a housing; a holder mounted in said housing for holding a transparency bearing an image to be projected onto the screen; a light diffuser mounted in said housing adjacent said holder to receive light and transmit the treceived light to the transparency as diffused light; a modeling light source in said housing for generating and transmitting modeling light to said diffuser; a strobe light source in said housing for generating and transmitting a flash of light to said diffuser; a first mirror mounted in said housing to direct light received along a first path from the transparency substantially perpendicular to the direction of said first path; adjustable mirror mounting means mounting said first mirror, including means for varying the angle of said first mirror with respect to the direction of light received by said first mirror, said angle varying means comprising a disc secured to the rear surface of said first mirror and including a threaded bore therein, a first screw extending through said housing and engaging said threaded bore, and a plurality of second screws extending through said housing spaced about said first screw and abutting said disc; a second mirror mounted on the exterior of the housing to direct light received from said first mirror along a second path parallel to said first path; and diaphragm means mounted on said housing for adjusting the light passing from said first mirror to said second mirror.
Claim 10
Dependent Claim
246 words
A projector for projecting an image onto a screen, comprising: a housing; a holder mounted in said housing for holding a transparency bearing an image to be projected onto the screen; a light diffuser mounted in said housing adjacent said holder to receive light and transmit the treceived light to the transparency as diffused light; a modeling light source in said housing for generating and transmitting modeling light to said diffuser; a strobe light source in said housing for generating and transmitting a flash of light to said diffuser; a first mirror mounted in said housing to direct light received along a first path from the transparency substantially perpendicular to the direction of said first path; adjustable mirror mounting means mounting said first mirror, including means for varying the angle of said first mirror with respect to the direction of light received by said first mirror, said angle varying means comprising a disc secured to the rear surface of said first mirror and including a threaded bore therein, a first screw extending through said housing and engaging said threaded bore, and a plurality of second screws extending through said housing spaced about said first screw and abutting said disc; a second mirror mounted on the exterior of the housing to direct light received from said first mirror along a second path parallel to said first path; and diaphragm means mounted on said housing for adjusting the light passing from said first mirror to said second mirror.
Claim 11
Dependent Claim
117 words
A projector for projecting an image on a screen, comprising: a housing; a transparency holder mounted in said housing for holding a transparency bearing an image to be projected on a screen; light means in said housing for generating and transMitting light toward a transparency held in said holder; and a light diffuser mounted in said housing between said light means and said transparency holder, said light diffuser comprising a mirrored light passageway for receiving light from said light means, a filter at the inlet of said passageway for blocking radiation in the infrared portion of the light spectrum, and a ground glass plate at the outlet of said passageway to direct diffused light toward said holder.
Claim 12
Dependent Claim
117 words
A projector for projecting an image on a screen, comprising: a housing; a transparency holder mounted in said housing for holding a transparency bearing an image to be projected on a screen; light means in said housing for generating and transMitting light toward a transparency held in said holder; and a light diffuser mounted in said housing between said light means and said transparency holder, said light diffuser comprising a mirrored light passageway for receiving light from said light means, a filter at the inlet of said passageway for blocking radiation in the infrared portion of the light spectrum, and a ground glass plate at the outlet of said passageway to direct diffused light toward said holder.
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |