US2356418A - Braun tube - Google Patents
Braun tube Download PDFInfo
- Publication number
- US2356418A US2356418A US254581A US25458139A US2356418A US 2356418 A US2356418 A US 2356418A US 254581 A US254581 A US 254581A US 25458139 A US25458139 A US 25458139A US 2356418 A US2356418 A US 2356418A
- Authority
- US
- United States
- Prior art keywords
- cathode ray
- deflection
- fluorescent screen
- tube
- deflecting
- 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 - Lifetime
Links
Images
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
- H01J29/84—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection
Definitions
- This invention relates to improvements in or concerning cathode ray or Braun tubes, and more particularly to the high vacuum type of such tubes for use in television systems.
- Fig. 1 schematically shows a ard type to which the invention is applied
- Fig. 2 shows a tube in which a modification of the invention.
- the actual or useful deflection of the cathode beam takes place at the point B of the drawing along the coordinate oi the electrostatic initial or biasing deflection, for instance, by the agency of coils or windings I and 2 through which pulsating direct current from t flow but no alternating current flows.
- This may be realized according to a further feature of my invention by directly connecting the deflecting coils or windings in the anode circuit of a final tube following a time base generator. The direct current portion thus applied to the deflecting coils magnetically restores the initial or biasing electrostatic deflection to the range of active operation.
- the residual current thus present involves an appreciable minimum deflection in the vicinity of the artificial position of rest of the cathode ray which position might be critical due to the presence of the harmful ions,
- the pure. electron .beam thus incident upon the central or vactive area of. a Braun tube fluo- ;rescent screen may ,beutilized for a variety of purposes, e. g. for being so deflected as to produce image in accordance with any optional meth- ,-od or scheme without running the risk that the deleterious ionic effect might injure thescreen.
- a cathode ray tube including an electron gun. emitting a cathode ray, a fluorescent screen having an active vand an idle area, electromag- -netic means for deflecting said cathode ray over the active :area .of said fluorescent screen, and electrostatic means for maintaining an electrostaticcathode-ray biassing fleld in the path of said cathode i'ay for deflecting ions onto the idle area said electrostatic means.
- a cathode ray tube including an electron gun emitting a cathode ray, afluorescentlscreen having .an active and idle area,and electromagnetic image deflection means including a coil for deflecting said cathode ray over the active area nation a cathode ray further feature of the invention to provide pargticular direct current of said fluorescent screen, electrostatic means for always deflectingions from impingement upon the 'activearea of said fluorescent screen, and means for passing a direct current component of current through said coil for directing only electrons to impinge upon said fluorescent screen.
- a cathode ray tube according to claim 1 havingdirect current fed windings for restoring electrons emitted from said electron gun into the .1
- combie tube comprising a luminescent screen and means including a cathode an ,anode for producing a cathode ray and for focusing said cathode ray on' saidscreen, a deflecting system arranged. between said anode and said screen and comprising a pair of magnet coils.
- a cathode ray tube including anele tlun gun emitting a cathode ray, a fluorescent screen hay and an idle area, electromagnetic.
Landscapes
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE207146X | 1938-02-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2356418A true US2356418A (en) | 1944-08-22 |
Family
ID=5793550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US254581A Expired - Lifetime US2356418A (en) | 1938-02-07 | 1939-02-04 | Braun tube |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2356418A (de) |
| BE (1) | BE432577A (de) |
| CH (1) | CH207146A (de) |
| FR (1) | FR849946A (de) |
| NL (1) | NL54243C (de) |
-
0
- NL NL54243D patent/NL54243C/xx active
- BE BE432577D patent/BE432577A/xx unknown
-
1939
- 1939-02-04 US US254581A patent/US2356418A/en not_active Expired - Lifetime
- 1939-02-04 CH CH207146D patent/CH207146A/de unknown
- 1939-02-06 FR FR849946D patent/FR849946A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE432577A (de) | |
| NL54243C (de) | |
| FR849946A (fr) | 1939-12-05 |
| CH207146A (de) | 1939-09-30 |
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