GB678307A - Improvements in or relating to television apparatus - Google Patents
Improvements in or relating to television apparatusInfo
- Publication number
- GB678307A GB678307A GB30791/49A GB3079149A GB678307A GB 678307 A GB678307 A GB 678307A GB 30791/49 A GB30791/49 A GB 30791/49A GB 3079149 A GB3079149 A GB 3079149A GB 678307 A GB678307 A GB 678307A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mirror
- light
- control layer
- concave mirror
- source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
- H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
- H04N5/7425—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being a dielectric deformable layer controlled by an electron beam, e.g. eidophor projector
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Mechanical Optical Scanning Systems (AREA)
Abstract
678,307. Television; light-valves. GES. GUR FORDERUNG DER FORSCHUNG AN DER EIDGENOSSISCHEN TECHNISCHEN HOCHSCHULE. Nov. 30, 1949 [Nov. 30, 1948], No. 30791/49. Class 40 (iii). In an arrangement for reproducing television pictures in which deformation produced in a control layer included in a Schlieronoptical system consequent upon scanning with a picture signal modulated cathode-ray beams are employed to modulate light from a local source, the control layer is carried by a concave mirror. In the apparatus shown in Fig. 2, rays from a light source 9 reflected by a mirror 14 illuminate a rectangular area of the control layer 15 which is carried on a concave mirror 17. The mirror 14 has alternate reflecting and transparent strips, Fig. 3, the reflecting strips 19 having black borders 20 and the whole acting as the equivalent of the system of bars and slits described in Specification 674,342, so that when the control layer is undeformed, light reflected back from the surface of the concave mirror is reflected again by mirror 14 back to the source. The illuminated area is scanned by a cathode-ray beam modulated at a high frequency by a high-frequency carrier wave modulated by the video signals and the deformations of the control layer surface caused by the scanning beam cause the reflected light beam to pass in corresponding amounts between the reflecting strips 19 of mirror 14 to produce an image on a screen 23. The concave mirror 17 is held by a spring 28 against rollers 27 and is slowly rotated about its central axis 32 by a motor 31, and a cooling system 33 is provided. The source of light 9 may be an arc lamp, two arc lamps used alternately or a series of mercury-vapour lamps. To avoid edge distortions, a stop 37 with a a rectangular opening having one rounded corner, Fig. 7 (not shown), is placed over the scanned area. A colour filter may be introduced into the plane 16 for colour reproduction. Specifications 543,485 and 548,643 also are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH678307X | 1948-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB678307A true GB678307A (en) | 1952-09-03 |
Family
ID=4528285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30791/49A Expired GB678307A (en) | 1948-11-30 | 1949-11-30 | Improvements in or relating to television apparatus |
Country Status (5)
| Country | Link |
|---|---|
| CH (1) | CH268712A (en) |
| DE (2) | DE822845C (en) |
| FR (2) | FR1006824A (en) |
| GB (1) | GB678307A (en) |
| NL (2) | NL77162C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2910532A (en) * | 1953-06-15 | 1959-10-27 | Electronique Soc Gen | Arrangement for projecting televised images on to a large screen |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE955243C (en) * | 1951-12-25 | 1957-01-03 | Loewe Opta Ag | Process for the production of pictorial reproductions from transmitted picture currents |
| US2765667A (en) * | 1953-04-20 | 1956-10-09 | Hupp Corp | Power steering assist mechanism |
| NL188899B (en) * | 1953-07-04 | Ishihara Sangyo Kaisha | PROCESS FOR THE PREPARATION OF 1-BROOM-3,5-DICHLOROBENZEN. | |
| NL113615C (en) * | 1954-06-01 | 1900-01-01 | ||
| DE1128174B (en) * | 1959-09-09 | 1962-04-19 | Technicolor Ltd | Device for reducing the discontinuity of real images |
-
0
- NL NL77161D patent/NL77161C/xx active
- NL NL77162D patent/NL77162C/xx active
-
1948
- 1948-11-30 CH CH268712D patent/CH268712A/en unknown
-
1949
- 1949-11-16 DE DEG410A patent/DE822845C/en not_active Expired
- 1949-11-22 FR FR1006824D patent/FR1006824A/en not_active Expired
- 1949-11-22 DE DEG442A patent/DE822846C/en not_active Expired
- 1949-11-23 FR FR1000284D patent/FR1000284A/en not_active Expired
- 1949-11-30 GB GB30791/49A patent/GB678307A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2910532A (en) * | 1953-06-15 | 1959-10-27 | Electronique Soc Gen | Arrangement for projecting televised images on to a large screen |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1000284A (en) | 1952-02-11 |
| DE822845C (en) | 1951-11-29 |
| DE822846C (en) | 1951-11-29 |
| NL77162C (en) | |
| NL77161C (en) | |
| CH268712A (en) | 1950-05-31 |
| FR1006824A (en) | 1952-04-28 |
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