GB1228990A - - Google Patents
Info
- Publication number
- GB1228990A GB1228990A GB1228990DA GB1228990A GB 1228990 A GB1228990 A GB 1228990A GB 1228990D A GB1228990D A GB 1228990DA GB 1228990 A GB1228990 A GB 1228990A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- aluminium
- target
- photo
- mesh
- 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
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
-
- 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
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/36—Photoelectric screens; Charge-storage screens
- H01J29/39—Charge-storage screens
- H01J29/44—Charge-storage screens exhibiting internal electric effects caused by particle radiation, e.g. bombardment-induced conductivity
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/26—Image pick-up tubes having an input of visible light and electric output
- H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
- H01J31/34—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at cathode potential, e.g. orthicon
- H01J31/36—Tubes with image amplification section, e.g. image-orthicon
Landscapes
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
1,228,990. Image pick-up tubes. FERNSEH G.m.b.H. 29 July, 1968 [27 July, 1967; 14 March, 1968], No. 36047/68. Heading H1D. In an image-orthicon tube having a very small separation between the photocathode 3 and the storage target 4 such that the image magnification is 1 : 1, the storage target has a storage layer of porous secondary emission conductivity (SEC) material and a high voltage applied between the photo-cathode and the storage target in order to obtain penetration of the photo-electrons into the storage layer. The SEC layer with an intervening aluminium layer, or with intervening aluminium and aluminium oxide layers, is supported by a metal mesh in order to withstand the high electrostatic forces. The separation D between target and photocathode is such that the radius r of the circle of confusion at the target, given by the equation r = 2 D Uo/U where Uo is the initial velocity of the photo-electrons expressed in volts and U the voltage between target and photo-cathode, is equal to the width of one picture point of the television image. The SEC layer may consist of potassium chloride or magnesium oxide and the supporting mesh of copper, tungsten or nickel. The intervening material may comprise an aluminium layer 10 Š thick deposited on an aluminium oxide layer 100 Š thick. The aluminium oxide layer may be omitted, an aluminium layer being provided on the mesh, previously provided with a gold layer, with the aid of a collodion layer. The organic layer is then evaporated and the aluminium united with the mesh at a temperature of 400-500‹ C., the gold acting as a solder. The aluminium layer may be 50-400 Š thick. The dimensions of the supporting mesh are also given. The storage target 4 and first and second field mesh electrodes 5, 6 are all supported from the cylinder 2 with the provision of ceramic insulators 22, 23. Contact springs 10a, 25, 24 connect the electrodes to the ring seal terminals 30, 29, 28 respectively. The whole assembly is secured in position by the end of contact spring 10a which is formed to grip the inner end of seal 30. A wall coating 27a connected to a further ring seal 27 prevents the passage of leakage current from the photocathode or its ring seal terminal 26 to the seal 28. The side of the photo-cathode adjacent the target may be provided with a non-reflective dark layer, e.g. sputtered aluminium, to avoid optical halves.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1537109 | 1967-07-27 | ||
| DE1967F0053079 DE1298542B (en) | 1967-07-27 | 1967-07-27 | SEC-type television pick-up tubes and methods of making them |
| DEF0055063 | 1968-03-14 | ||
| DE19681639237 DE1639237C3 (en) | 1967-07-27 | 1968-03-14 | Method of manufacturing storage electrodes for SEC type television pick-up tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1228990A true GB1228990A (en) | 1971-04-21 |
Family
ID=27430562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1228990D Expired GB1228990A (en) | 1967-07-27 | 1968-07-29 |
Country Status (4)
| Country | Link |
|---|---|
| DE (2) | DE1298542B (en) |
| FR (1) | FR1575092A (en) |
| GB (1) | GB1228990A (en) |
| NL (1) | NL6810626A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7603830A (en) * | 1976-04-12 | 1977-10-14 | Philips Nv | TELEVISION RECORDING TUBE. |
| NL7609075A (en) * | 1976-08-16 | 1978-02-20 | Philips Nv | TELEVISION CAMERA TUBE. |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE544021A (en) * | 1954-12-30 | |||
| NL265016A (en) * | 1960-05-19 |
-
1967
- 1967-07-27 DE DE1967F0053079 patent/DE1298542B/en active Pending
-
1968
- 1968-03-14 DE DE19681639237 patent/DE1639237C3/en not_active Expired
- 1968-07-23 FR FR1575092D patent/FR1575092A/fr not_active Expired
- 1968-07-26 NL NL6810626A patent/NL6810626A/xx unknown
- 1968-07-29 GB GB1228990D patent/GB1228990A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1298542B (en) | 1969-07-03 |
| DE1639237C3 (en) | 1975-08-21 |
| DE1639237A1 (en) | 1971-01-14 |
| DE1639237B2 (en) | 1974-10-17 |
| FR1575092A (en) | 1969-07-18 |
| NL6810626A (en) | 1969-01-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |