US4074322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television projector
Assignee: TELEJECTOR Ltd
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Filing: 1977-01-24
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Granted: 1978-02-14
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Expires: 1997-01-24
Abstract
Abstract Television picture image projecting apparatus removably attached to a standard television receiver and including a housing having an image entrance opening adjacent the receiving screen, a Fresnel lens in the housing for enlarging the received image, and a mirror combination in the housing including two plane reflecting mirrors joined together with the reflecting surfaces defining an included angle of ninety degrees for inverting a received image. The mirror combination is located optically between the lens and an image exit opening adjacent the other end of the housing, and the resulting image is projected on a planar viewing surface such as a standard projector screen in a forward projection mode. In another aspect, a plane reflecting mirror is located optically between the lens and mirror combination, and the resulting image is projected on one surface of a translucent screen for viewing from the opposite surface in a rear projection mode. In another aspect, a plane reflecting mirror is located optically between the television screen and the lens, and the resulting image is projected on a viewing surface in a forward projection mode.
Inventors
- 👤 Angelo M. Cammilleri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:54
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
273 words
Apparatus for projecting an optical image from the screen of a television receiver onto a generally planar viewing medium spaced therefrom comprising: (a) an elongated housing having a longitudinal axis; an entrance opening at one end of said housing for receiving the optical image to be projected, and an exit opening adjacent the other end of said housing through which the image leaves for projecting onto the viewing medium, said housing adapted to be operatively associated with a television receiver with said entrance opening adjacent the screen of said receiver, said exit opening facing said viewing medium, and said housing longitudinal axis disposed in a plane generally perpendicular to the plane of the receiver screen; (b) a lens supported in said housing and disposed in a plane generally perpendicular to said housing longitudinal axis, the center of said lens being substantially coincident with said housing longitudinal axis, said lens receiving an optical image from said entrance opening and converting said image into an enlarged, inverted and reversed image; and (c) a mirror combination including two plane reflecting mirror elements joined along an edge of each mirror defining a straight intersection, said intersection being disposed in each plane of the reflecting surfaces of said mirrors, said intersection being disposed in a plane containing said housing longitudinal axis, the reflecting surfaces of said mirrors being disposed to define an included angle of 90°, said mirror combination being located optically between said lens and said housing exit opening with said reflecting surfaces being disposed to receive an image toward said opening, said mirror combination inverting the received image and projecting the image onto the viewing medium.
Claim 2
Dependent Claim
273 words
Apparatus for projecting an optical image from the screen of a television receiver onto a generally planar viewing medium spaced therefrom comprising: (a) an elongated housing having a longitudinal axis; an entrance opening at one end of said housing for receiving the optical image to be projected, and an exit opening adjacent the other end of said housing through which the image leaves for projecting onto the viewing medium, said housing adapted to be operatively associated with a television receiver with said entrance opening adjacent the screen of said receiver, said exit opening facing said viewing medium, and said housing longitudinal axis disposed in a plane generally perpendicular to the plane of the receiver screen; (b) a lens supported in said housing and disposed in a plane generally perpendicular to said housing longitudinal axis, the center of said lens being substantially coincident with said housing longitudinal axis, said lens receiving an optical image from said entrance opening and converting said image into an enlarged, inverted and reversed image; and (c) a mirror combination including two plane reflecting mirror elements joined along an edge of each mirror defining a straight intersection, said intersection being disposed in each plane of the reflecting surfaces of said mirrors, said intersection being disposed in a plane containing said housing longitudinal axis, the reflecting surfaces of said mirrors being disposed to define an included angle of 90°, said mirror combination being located optically between said lens and said housing exit opening with said reflecting surfaces being disposed to receive an image toward said opening, said mirror combination inverting the received image and projecting the image onto the viewing medium.
Claim 3
Dependent Claim
87 words
Apparatus according to claim 1, wherein said entrance opening is disposed in a plane substantially perpendicular to said longitudinal axis, said exit opening is disposed in a plane substantially parallel to said longitudinal axis, and said straight intersection of said mirror combination lies in a plane which defines an included angle of substantially 45° with the plane of said lens and an included angle of substantially 45° with the plane of said lens and an included angle of substantially 45° with the plane of said exit opening.
Claim 4
Dependent Claim
118 words
Apparatus according to claim 1, wherein said entrance opening is disposed in a plane substantially perpendicular to said longitudinal axis, said exit opening is disposed in a plane which defines with said longitudinal axis an included angle of less than 90°, said mirror combination is disposed with said reflecting surfaces facing said exit opening and said straight line intersection defines with said longitudinal axis an included angle of substantially 45°, and further including a plane reflecting mirror optically between said lens and said mirror combination, the reflecting surface of said plane mirror facing said lens and the reflecting surfaces of said mirror combination, said plane mirror intersecting said housing longitudinal axis at an included angle of substantially 45°.
Claim 5
Dependent Claim
105 words
Apparatus according to claim 1, wherein said entrance opening is disposed in a plane substantially parallel to said longitudinal axis, said exit opening is disposed in a plane which defines with said longitudinal axis an included angle of less than 90°, said mirror combination being disposed with said reflecting surfaces facing said lens and said exit opening, and further including a plane reflecting mirror optically between said entrance opening and said lens, said plane mirror being disposed in a plane defining with said housing longitudinal axis an included angle of substantially 45° and with the reflecting surface thereof facing said entrance opening and said lens.
Claim 6
Dependent Claim
26 words
Apparatus according to claim 4, wherein said mirror combination is disposed with said straight intersection defining with said housing longitudinal axis an included angle of 37.5°.
Claim 7
Dependent Claim
12 words
Apparatus according to claim 1, wherein said lens comprises a Fresnel lens.
Claim 8
Dependent Claim
51 words
Apparatus according to claim 1, wherein said housing comprises a fixed portion operatively associated with said television receiver and a movable portion carried by said fixed portion, said movable portion containing said lens and said mirror combination, whereby relative movement of said housing portions provides optical focusing of the projected image.
Claim 9
Dependent Claim
28 words
Apparatus according to claim 1 further including means for removably attaching said housing to a television receiver with said image entrance opening in registry with the receiver screen.
Claim 10
Dependent Claim
54 words
Apparatus according to claim 1 wherein said housing has a base disposed in a plane substantially perpendicular to the plane of said image entrance opening, said base adapted to rest on a supporting surface, whereby said housing is supported adjacent a television receiver with said image entrance opening in registry with the receiver screen.
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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) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |