Patent CH248735A successfully refreshed from Google Patents.
Patent US4257694A successfully refreshed from Google Patents.
US4257694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection system
Assignee: SODING TV GmbH AND CO BILD AND TON INTERNATIONAL
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Filing: 1979-01-31
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Granted: 1981-03-24
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Expires: 1999-01-31
Abstract
Abstract The invention relates to a projection system for diapositive film strips, comprising an essentially cubic projection box, the front side of which comprises a ground glass plate as screen and in the interior of which a projector and two reflecting mirrors are arranged to project the projecting beam exiting from the projector on to the ground glass plate, characterized in that the illumination means of the projector generating the projecting light is disposed such that its optical axis passing through the optical center of the objective forms an acute angle together with the optical axis of the objective and the principal ray of the projecting beam exiting from the projector is inclined toward that wall of the projection box at which the projector is located.
Inventors
- 👤 Freisleben Reinhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:38
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
286 words
A projection system having a compressed optical path for projecting diapositive film strips comprising: a projection box having a plurality of walls including one wall in the form of a ground glass plate and at least another wall transversely disposed to said one wall, said one wall in the form of a ground glass plate acting as a screen for rear view projections; projector means for providing a projection beam having a principal ray, said projector means being disposed adjacent to said another wall at a location thereon remote from said one wall and including illumination means for generating said projecting beam and an objective having a relatively short focal length for focusing an image being projected upon said one wall, said illumination means having an optical axis along which said principal ray is produced and said objective having an optical axis, an optical center and an imaging cone for incoming radiation provided by said illumination means, said objective having said optical axis thereof parallelly disposed to said another wall and transversely disposed to said one wall and said illumination means being positioned having said optical axis thereof being inclined toward said another wall in a direction in which said principal ray is produced and passing through said optical center of said objective to form an acute angle with said optical axis of said objective and said another wall, said acute angle being limited to enable said projecting beam from said illumination means to be substantially within said imaging cone for incoming radiation; and first and second reflecting mirrors being disposed within said projection box and arranged to project said projecting beam upon said one wall, said first and second reflecting means being substantially parallelly disposed.
Claim 2
Dependent Claim
286 words
A projection system having a compressed optical path for projecting diapositive film strips comprising: a projection box having a plurality of walls including one wall in the form of a ground glass plate and at least another wall transversely disposed to said one wall, said one wall in the form of a ground glass plate acting as a screen for rear view projections; projector means for providing a projection beam having a principal ray, said projector means being disposed adjacent to said another wall at a location thereon remote from said one wall and including illumination means for generating said projecting beam and an objective having a relatively short focal length for focusing an image being projected upon said one wall, said illumination means having an optical axis along which said principal ray is produced and said objective having an optical axis, an optical center and an imaging cone for incoming radiation provided by said illumination means, said objective having said optical axis thereof parallelly disposed to said another wall and transversely disposed to said one wall and said illumination means being positioned having said optical axis thereof being inclined toward said another wall in a direction in which said principal ray is produced and passing through said optical center of said objective to form an acute angle with said optical axis of said objective and said another wall, said acute angle being limited to enable said projecting beam from said illumination means to be substantially within said imaging cone for incoming radiation; and first and second reflecting mirrors being disposed within said projection box and arranged to project said projecting beam upon said one wall, said first and second reflecting means being substantially parallelly disposed.
Claim 3
Dependent Claim
53 words
The projector system according to claim 1, wherein said illumination means comprises a condenser system having an angular aperture, said objective exhibiting an angular field and said acute angle corresponding to the difference by which the angular field of the objective is greater than half of the angular aperture of the condenser system.
Claim 4
Dependent Claim
34 words
The projection system according to claim 1, further comprising a third reflecting mirror disposed to deflect the projecting beam path by 90° arranged within the projector box to reflect the projecting beam by 90°.
Claim 5
Dependent Claim
26 words
The projection system according to claim 3, wherein said third reflecting mirror is disposed behind the objective in the light transmitting direction of said projecting beam.
Claim 6
Dependent Claim
34 words
The projection system according to claim 4, further comprising a guide path for an endless diapositive film strip disposed in said projector means, said guide path including the objective and the third reflecting mirror.
Claim 7
Dependent Claim
29 words
The projection system according to claim 5, wherein the guide path comprises a film gate means, and a plurality of guide rolls, one of said guide rolls being driven.
Claim 8
Dependent Claim
29 words
The projection system according to claim 6, wherein another one of the guide rolls is a displaceable tension roll and is displaceable into the interior of the guide path.
Claim 9
Dependent Claim
17 words
The projection system according to claim 6 wherein the film gate means comprises a rigid skid arrangement.
Claim 10
Dependent Claim
38 words
The projection system according to claim 8, wherein the rigid skid arrangement has a 90° arc directly in front of and behind the film gate means with respect to the direction of travel of said endless film strip.
Claim 11
Dependent Claim
21 words
The projection system according to claim 1, wherein said illumination means comprises a three-lens condenser system having a short focal length.
Claim 12
Dependent Claim
20 words
The projection system according to claim 1, wherein the projector comprises a unit to be inserted into the projection box.
Claim 13
Dependent Claim
19 words
The projection system according to claim 11, wherein one of the two reflecting mirrors is disposed in the projector.
Claim 14
Dependent Claim
23 words
The projection system according to claim 5, wherein the guide path comprises interconnected elements forming a cassette which is insertable into the projector.
Claim 15
Dependent Claim
46 words
The projection system according to claim 1 wherein said principal ray of said projecting beam additionally forms said acute angle with a plane parallel to said another wall passing through said ground glass plate at a point where said principal ray intersects said ground glass plate.
References Cited (Backward Citations)
GB190706846A
Cited
US1253220A
Cited
GB297371A
Cited
US1896928A
Cited
US1879600A
Cited
GB389399A
Cited
US1952522A
Cited
US2100008A
Cited
US2543561A
Cited
US2763178A
Cited
US3507571A
Cited
US4037951A
Cited
US3924941A
Cited
US3963337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |