Patent US3834798A successfully refreshed from Google Patents.
US3834798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viewing screen for motion picture projectors
Assignee: Individual
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Filing: 1972-12-20
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Granted: 1974-09-10
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Expires: 1992-12-20
Abstract
Abstract A slide-out viewing screen for a motion picture projector. A slidable frame is carried by the projector and a negative lens, mirror and rear projection viewing screen are mounted on the frame. The negative lens and the mirror are pivotably supported by the frame and are movable from a stored position to an operative position when the frame is moved from a stored position to a viewing position. Through an interaction between the mirror and the negative lens and the projector housing, the mirror and negative lens will be positioned in their stored position when the frame is in its stored position.
Inventors
- 👤 J Bundschuh
- 👤 W Goddard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:44
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
A projector having a housing, projection means for projecting an image along a predetermined path to a remote projection area, and an auxiliary viewing means for personal viewing, said auxiliary viewing means comprising: a screen assembly, including a generally planar viewing screen, positioned to one side of and generally parallel to said predetermined path so as not to interfere with image projection along said path; means mounting said assembly for movement, substantially parallel to the plane of said screen, between a storage position wherein said viewing screen is housed within said housing and an operative position wherein said viewing screen is external thereof; and optical means pivotally carried by said screen assembly for movement relative thereto between an inactive position lying generally parallel to said plane and to said one side of said predetermined path when said screen assembly is in said storage position, and an active position extending into said path at an angle to said plane so as to direct a projected image onto said screen when said screen assembly is in its operative position.
Claim 2
Dependent Claim
177 words
A projector having a housing, projection means for projecting an image along a predetermined path to a remote projection area, and an auxiliary viewing means for personal viewing, said auxiliary viewing means comprising: a screen assembly, including a generally planar viewing screen, positioned to one side of and generally parallel to said predetermined path so as not to interfere with image projection along said path; means mounting said assembly for movement, substantially parallel to the plane of said screen, between a storage position wherein said viewing screen is housed within said housing and an operative position wherein said viewing screen is external thereof; and optical means pivotally carried by said screen assembly for movement relative thereto between an inactive position lying generally parallel to said plane and to said one side of said predetermined path when said screen assembly is in said storage position, and an active position extending into said path at an angle to said plane so as to direct a projected image onto said screen when said screen assembly is in its operative position.
Claim 3
Dependent Claim
38 words
The auxiliary viewing means of claim 1 further including means responsive to movement of said screen assembly from said storage position to said operative position for moving said optical means from said inactive position to said active position.
Claim 4
Dependent Claim
19 words
The auxiliary viewing means of claim 1 further including means for latching said screen assembly in said active position.
Claim 5
Dependent Claim
31 words
The auxiliary viewing means of claim 3 wherein said means for latching said screen assembly in said active position is releasable by movement of said optical means to its inactive position.
Claim 6
Dependent Claim
19 words
The auxiliary viewing means of claim 1 further including means for latching said screen assembly in said inactive position.
Claim 7
Dependent Claim
49 words
The auxiliary viewing means of claim 5 wherein said means for latching said screen assembly in said inactive position includes a protuberance on said optical means and a notch in said projector housing, said notch being engaged by said protuberance when said screen assembly is in its storage position.
Claim 8
Dependent Claim
167 words
In a motion picture projector having a housing and a projectiOn lens for projecting a motion picture image along a projection path, a compact personal viewing screen assembly comprising: a frame movable in said housing between a stored position and an operative position; a rear projection viewing screen carried by said frame; a lens unit movably mounted on said frame; means for biasing said lens unit to an operative position in said projection path from a stored position on said frame; a mirror movably mounted on said frame; and means for biasing said mirror to an operative position intersecting said projection path for reflecting the motion picture image projected along said path onto said viewing screen from a stored position on said frame; whereby when said frame is moved to its operative position, said lens unit and said mirror will be moved to their operative position, and when said frame is in its stored position, said lens unit and said mirror will be in their stored position.
Claim 9
Dependent Claim
167 words
In a motion picture projector having a housing and a projectiOn lens for projecting a motion picture image along a projection path, a compact personal viewing screen assembly comprising: a frame movable in said housing between a stored position and an operative position; a rear projection viewing screen carried by said frame; a lens unit movably mounted on said frame; means for biasing said lens unit to an operative position in said projection path from a stored position on said frame; a mirror movably mounted on said frame; and means for biasing said mirror to an operative position intersecting said projection path for reflecting the motion picture image projected along said path onto said viewing screen from a stored position on said frame; whereby when said frame is moved to its operative position, said lens unit and said mirror will be moved to their operative position, and when said frame is in its stored position, said lens unit and said mirror will be in their stored position.
Claim 10
Dependent Claim
63 words
The structure of claim 7 further including means for latching said frame in said operative position, said latching means comprising a latching lever pivotally mounted on said frame, said latching lever having a prong extending from one end thereof, a notch located in said housing and a means for biasing said prong into said notch when said frame is in said operative position.
Claim 11
Dependent Claim
39 words
The structure of claim 8, wherein said mirror has means for engaging said latching lever when said mirror is moved to said stored position so as to pivot said latching lever to disengage said prong thereof from said notch.
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |