GB714345A - Electronic device for maintaining the scanning raster of a flying-spot scanner in register with the film frames - Google Patents
Electronic device for maintaining the scanning raster of a flying-spot scanner in register with the film framesInfo
- Publication number
- GB714345A GB714345A GB2327151A GB2327151A GB714345A GB 714345 A GB714345 A GB 714345A GB 2327151 A GB2327151 A GB 2327151A GB 2327151 A GB2327151 A GB 2327151A GB 714345 A GB714345 A GB 714345A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- sprocket hole
- cathode ray
- ray tube
- scanning raster
- 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
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/36—Scanning of motion picture films, e.g. for telecine
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
714,345. Photo electric control system. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Sept. 11, 1952 [Oct. 5, 1951], No. 23271/51. Class 40 (3) In a device for maintaining the raster of a flying spot film scanner in register with the frame, means are provided for projecting a patch of light on to a part of the film which includes at least a part of a sprocket hole, light reflected from this part producing in a detector an output which depends on the relative position of the sprocket hole and the patch of light and is used to adjust the position of the scanning raster. As shown, the scanning raster is produced by a cathode ray tube and is imaged on to the film plane FP. The light spot which i'luminates the sprocket hole is produced by an auxiliary cathode ray tube AT and the overlapping portions A, B, and sprocket hole SH are shown in Fig. 4. Photo-electric cells PE<SP>1</SP>, PE' each receive light from one of the areas A, B, and feed a differential amplifier DA the output of which is applied to a servo system SS to adjust the light patch relatively to the sprocket hole and at the same time the position of the scanning raster of tube F.S. In a modification (Fig. 2, not shown) the cathode ray tube AT is replaced by a small projector lamp, light from which is reflected into the region of the sprocket hole by a mirror the angular position of which is adjustable. The mirror may be carried by a loud speaker speech coil. In a further embodiment (Fig. 3 not shown) the beam produced by cathode ray tube AT oscillates across one edge of the sprocket hole thus producing in a single photo-electric cell a number of square pulses whose width depends on the degree of overlap of the trace with the hole, and whose average value varies in sense and magnitude according to the duration and extent of misalignment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2327151A GB714345A (en) | 1951-10-05 | 1951-10-05 | Electronic device for maintaining the scanning raster of a flying-spot scanner in register with the film frames |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2327151A GB714345A (en) | 1951-10-05 | 1951-10-05 | Electronic device for maintaining the scanning raster of a flying-spot scanner in register with the film frames |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB714345A true GB714345A (en) | 1954-08-25 |
Family
ID=10192974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2327151A Expired GB714345A (en) | 1951-10-05 | 1951-10-05 | Electronic device for maintaining the scanning raster of a flying-spot scanner in register with the film frames |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB714345A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5430478A (en) * | 1986-09-04 | 1995-07-04 | Mscl, Inc. | Film weave correction system |
| US5555092A (en) * | 1987-12-15 | 1996-09-10 | Mscl | Method and apparatus for correcting horizontal, vertical and framing errors in motion picture film transfer |
-
1951
- 1951-10-05 GB GB2327151A patent/GB714345A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5430478A (en) * | 1986-09-04 | 1995-07-04 | Mscl, Inc. | Film weave correction system |
| US5600450A (en) * | 1986-09-04 | 1997-02-04 | Mscl, Inc. | Film weave correction system |
| US5555092A (en) * | 1987-12-15 | 1996-09-10 | Mscl | Method and apparatus for correcting horizontal, vertical and framing errors in motion picture film transfer |
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