GB739362A - Improvements in and relating to television camera tubes - Google Patents
Improvements in and relating to television camera tubesInfo
- Publication number
- GB739362A GB739362A GB2766/54A GB276654A GB739362A GB 739362 A GB739362 A GB 739362A GB 2766/54 A GB2766/54 A GB 2766/54A GB 276654 A GB276654 A GB 276654A GB 739362 A GB739362 A GB 739362A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnification
- cathode
- screened
- tube
- mask
- 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
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
- H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit
- H04N5/185—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit for the black level
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
739,362. Cathode-ray tubes. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Jan. 29, 1954 [Feb. 2, 1953], No. 2766/54. Class 39 (1). [Also in Group XL (b)] A movable mark is positioned between an object to'be televised and the photo-cathode of an image type tube and is adapted to move upon variation of the magnification of the electronoptical system so that an edge of the storage electrode is always screened from photoelectrons for all magnification settings. The screened edge so produced is employed to generate a " black " level signal when impinged by the scanning beam of the tube. In one embodiment (Fig. 1), the mask 28 is mechanically coupled, via elements 30-34, to a shaft 24 which also controls the electron-optical magnification of the tube 1 by adjustment of potentiometers 21-23 which control the current in the focusing coils 18-20, the arrangement being such that the portion of the photo-cathode screened from incident light increases with increase of magnification. In an alternative arrangement (Fig. 2), the current in one of the focusing coils 23 is employed to energize an electromagnet 35 to displace the mask against the force of a spring 37. In a further embodiment (Fig. 3), the mask provided a rectangular aperture formed by two portions 38, 39 which are moved along one of the diagonals of the aperture by means of elements 40-42 controlled by electromagnet 35 and spring 37.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL316987X | 1953-02-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB739362A true GB739362A (en) | 1955-10-26 |
Family
ID=19783841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2766/54A Expired GB739362A (en) | 1953-02-02 | 1954-01-29 | Improvements in and relating to television camera tubes |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2803753A (en) |
| BE (1) | BE526155A (en) |
| CH (1) | CH316987A (en) |
| DE (1) | DE935737C (en) |
| FR (1) | FR1092162A (en) |
| GB (1) | GB739362A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2310671A (en) * | 1941-02-12 | 1943-02-09 | John C Batchelor | Image producer |
| US2384232A (en) * | 1942-05-02 | 1945-09-04 | Rca Corp | Television view finder |
-
0
- BE BE526155D patent/BE526155A/xx unknown
-
1954
- 1954-01-29 GB GB2766/54A patent/GB739362A/en not_active Expired
- 1954-01-29 US US407073A patent/US2803753A/en not_active Expired - Lifetime
- 1954-01-30 DE DEN8374A patent/DE935737C/en not_active Expired
- 1954-02-01 CH CH316987D patent/CH316987A/en unknown
- 1954-02-01 FR FR1092162D patent/FR1092162A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH316987A (en) | 1956-10-31 |
| FR1092162A (en) | 1955-04-19 |
| US2803753A (en) | 1957-08-20 |
| BE526155A (en) | |
| DE935737C (en) | 1955-11-24 |
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