US2463710A - High-frequency generator - Google Patents
High-frequency generator Download PDFInfo
- Publication number
- US2463710A US2463710A US618352A US61835245A US2463710A US 2463710 A US2463710 A US 2463710A US 618352 A US618352 A US 618352A US 61835245 A US61835245 A US 61835245A US 2463710 A US2463710 A US 2463710A
- Authority
- US
- United States
- Prior art keywords
- collecting electrode
- electrons
- frequency
- electrode
- waveform
- 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
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/43—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of beam deflection tubes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/02—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused
- H01J31/04—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused with only one or two output electrodes with only two electrically independant groups or electrodes
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B13/00—Generation of oscillations using deflection of electron beam in a cathode-ray tube
Definitions
- the present invention relates to high frequency generators, and particularly to high frequency generators of the electron beam type.
- Previously proposed electron beam high frequency generators have employed various forms of commutators which are scanned by an electron beam. Interception of the beam by alternate commutator segments produces oppositely directed impulses in a resonant circuit coupled to the commutator, thereby sustaining oscillations in the resonant circuit when the number of pairs of commutator segments scanned per second is equal to the natural frequency of the resonant circuit.
- the frequency and waveform of the output voltage is determined largely by the nature of the load circuit.
- the circuit Q of the resonant circuit is very high, as it is in the case of a cavity resonator, a relatively pure sinusoidal waveform will be produced in the output circuit.
- the principal object of the present invention is to provide a new type of high frequency generator. or frequency multiplier, wherein the frequency and waveform of the output voltage is not dependent upon circuit constants, but is instead determined by the physical construction of the generator.
- Another object of the invention is to provide an electronic high frequency generator which is adapted to produce an output current having any desired waveform.
- Still another object of the invention is to provide an improved means for controlling the generation of high frequency currents by lower frequency currents.
- a specially shaped collecting electrode in a tube structure similar to a conventional cathode ray tube.
- the collecting electrode is cyclically scanned by an electron beam and is shaped so that the length of the path traversed by the electrons in the beam varies throughout the scanning cycle. This variation in beam length is related to the scanning rate and to the electron velocity so as to produce currents having any desired frequency and waveform in an output circuit connected to the collecting electrode.
- Fig. 1 discloses one form of the invention in which the electron beam is cyclically deflected along a rectilinear scanning path;
- Fig. 2 is a modification of Fig. 1 in which the electron beam is deflected so as to scan a circular path on a ring-shaped collecting electrode;
- Fig. 3 illustrates the waves produced in the electron beam when a deflecting voltage of recurrent triangular waveform is applied to the deflecting electrodes of the tube shown in Fig. 1;
- Fig. 4 illustrates the waveform of the current flowing to the collecting electrode of the tube shown in Fig. l for different angular positions thereof when the electron beam is deflected as shown in Fig. 3.
- a cathode ray tube having the conventional heater I, cathode 2, and beam forming electrodes 3, 4 and 5, all of which are energized by a suitable battery 6, or the like.
- the pencillike electron beam indicated by the broken line '3, passes between a pair of deflecting electrodes 8, 'which are positioned on opposite sides of the beam axis.
- the equivalent magnetic deflecting coils or other suitable means may be substituted for the electrostatic deflecting electrodes, if desired.
- the electron beam is caused to scan a rectilinear path by ap-- plying an alternating voltage from a suitable source, such as a control oscillator 9, to the deflecting electrodes 8.
- the collecting electrode H! is a plate which is positioned in angular relation to the beam axis. The upper and lower portions of the plate are formed at an angle to the center section, as indicated.
- the collecting electrode is connected to battery 6 through a radio frequency choke ll, across which the output voltage appears when the tube is in operation.
- the alternating voltage applied to the deflecting electrodes 8 by the control oscillator 9 is of triangular waveform and has a period several times shorter than the transit time of the electrons from the deflecting electrodes to the collecting electrode. Triangular waves will then be produced in the beam as illustrated in Fig. 3. The electrons all travel in straight lines at the same velocity causing these waves to travel towards the right of the figure. It is obvious that if the collecting electrode was a plane surface located perpendicular to the beam axis, as at A, that the number of electrons impinging on the collecting electrode per unit of time would remain constant. The resulting cur rent in the output circuit is illustrated by the straight line A in Fig. 4.
- the collecting electrode were rotated about an axis perpendicular to deflecting electrodes. desiredphase relation may be achieved by conthe beam axis, and to the scanning path, to the position C a large number of electrons would impinge on the collecting electrode simultaneously, following which electrons would impinge thereon at one-half the rate as when the collecting electrode occupied the position A.
- the resulting output current is shown by curve C in Fig. 4. ,If, the collecting electrode-were rotated to an intermediate position such as'B' in Fig.3 the output current would follow a curve such as B in Fi 4.
- gatriangular voltage .wave was applied to the deflecting electrodes for simplicity of explana- ..tion. If the deflecting voltage is sinusoidal then sinusoidal waves will .beproduced in the beam similar; to the triangular waves shown in Fig. 3.
- the output current will stillbe constant if the collecting electrode is a plane surface positioned as.at, A of. Fig. 3. If the collecting electrode was rotated to the position C an output current similarto that shown in curve C of Fig. 4' will be obtained, but with. rounded corners. With the col- ,lecting electrode rotated. to the position B the rounding of the corners in the output wave would bemore pronounced. and wouldresult in a wave in, orderto use the tube as: a-self-excited oscilla- .tor.
- the invention contemrplates the use-ofa collectingelectrodev havinga plurality of intersecting plane surfaces which are successively-scanned bythe electron beam as i]- lustrated in. Fig. 1. ,-For each scanning cycle the .output current wil1:pass.through ,a. number of cycles equal. to .thehnumber. of -plane. surfaces in .the.collecting-electrode. .Thus with the collectingv electrode shaped ,as-in Fig. 1..an-. output cur- .rent having threetimes the frequency of. the defleeting voltage will be obtained.
- the collecting electrode may be .made inthe fOIfm.0f a corrugated ring l2 as showninFig. 2.
- Anadditional pair of deflecting electrodes l3 are provided fordeflecting the electron beam perpendicular to ,the plane of the drawing.
- the e1ectron'beam 1 iscaused' to scan a circular path byapplying deflecting voltages which are. in phase quadrature to the two sets of
- the potentials applied tothe accelerating electrodes of the beam forming-gun must be adjusted to provide an electron velocity which isproperly related to the depth of; the corrugations in the collecting electrode and the scanning rate of the beam in order to obtain the optimum, conditions for maximum output.
- collecting electrode being shaped sov as to cause the transit time of the electrons impinging thereon to cyclically increase anddecrease during'each scanning cycle to thereby produce a currentfiow having a waveform dependent on the-shape-of said collecting electrode.
- a source of electrons means for deriving a, beam of electrons from-said source, means for rotating said beam, a collecting electrode disposed in the patriot said r0 said collecting electrode being shaped so that the distance traversed by the electrons in said beam between said source and" the point where they impinge on said collectingfelectrode :alternately increases and decreases in ;
- a source of. electrons
- means for deriving a beam *of electrons having a constantvelocity: and uniform density from. said source means for causing said beam' to cyclically scan a fixed path a collecting electrode disposed in said path, said electrode being shaped so asto cause the length of said beam, measured from saidsource to the pointat whichtheelectrons impinge upon said electrode, to increase during a portion of each scanning cycle. and to decrease during .another portion of each scanning -cycleto thereby cyclically vary said beam length a. plurality ofv times during; each scanning, cycle, whereby a current having a frequencywhich-is a multiple of the scanning frequency. is produced insaid collecting electrode.
Landscapes
- Particle Accelerators (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE470043D BE470043A (th) | 1945-09-24 | ||
US618352A US2463710A (en) | 1945-09-24 | 1945-09-24 | High-frequency generator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US618352A US2463710A (en) | 1945-09-24 | 1945-09-24 | High-frequency generator |
Publications (1)
Publication Number | Publication Date |
---|---|
US2463710A true US2463710A (en) | 1949-03-08 |
Family
ID=24477353
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US618352A Expired - Lifetime US2463710A (en) | 1945-09-24 | 1945-09-24 | High-frequency generator |
Country Status (2)
Country | Link |
---|---|
US (1) | US2463710A (th) |
BE (1) | BE470043A (th) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2617016A (en) * | 1948-01-12 | 1952-11-04 | Hartford Nat Bank & Trust Co | Mixing circuit for decimeter and centimeter waves |
US2704336A (en) * | 1951-01-03 | 1955-03-15 | Kazan Benjamin | Pulse counting tube |
US2747130A (en) * | 1951-09-12 | 1956-05-22 | Harold D Goldberg | Electronic system |
US2810859A (en) * | 1955-05-27 | 1957-10-22 | Karl F Ross | Cathode ray filter |
DE1100013B (de) * | 1958-09-16 | 1961-02-23 | Rheinpreussen Ag | Verfahren zur kontinuierlichen Herstellung von niedermolekularen, nicht harzartigen Kondensations-produkten aus Carbonylverbindungen |
US3161801A (en) * | 1960-03-31 | 1964-12-15 | Allen Joseph Stevens | Delay apparatus and method employing electron stream |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2026892A (en) * | 1931-11-11 | 1936-01-07 | Heintz & Kaufman Ltd | High frequency generator |
US2157749A (en) * | 1938-01-11 | 1939-05-09 | Du Mont Allen B Lab Inc | Method and system for television communication |
US2173193A (en) * | 1937-08-18 | 1939-09-19 | Rca Corp | High-frequency oscillator |
US2288694A (en) * | 1940-05-11 | 1942-07-07 | Bell Telephone Labor Inc | Method of and apparatus for extracting energy from a beam of velocity modulated electrons |
US2307693A (en) * | 1941-04-30 | 1943-01-05 | Rca Corp | Frequency multiplier |
-
0
- BE BE470043D patent/BE470043A/xx unknown
-
1945
- 1945-09-24 US US618352A patent/US2463710A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2026892A (en) * | 1931-11-11 | 1936-01-07 | Heintz & Kaufman Ltd | High frequency generator |
US2173193A (en) * | 1937-08-18 | 1939-09-19 | Rca Corp | High-frequency oscillator |
US2157749A (en) * | 1938-01-11 | 1939-05-09 | Du Mont Allen B Lab Inc | Method and system for television communication |
US2288694A (en) * | 1940-05-11 | 1942-07-07 | Bell Telephone Labor Inc | Method of and apparatus for extracting energy from a beam of velocity modulated electrons |
US2307693A (en) * | 1941-04-30 | 1943-01-05 | Rca Corp | Frequency multiplier |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2617016A (en) * | 1948-01-12 | 1952-11-04 | Hartford Nat Bank & Trust Co | Mixing circuit for decimeter and centimeter waves |
US2704336A (en) * | 1951-01-03 | 1955-03-15 | Kazan Benjamin | Pulse counting tube |
US2747130A (en) * | 1951-09-12 | 1956-05-22 | Harold D Goldberg | Electronic system |
US2810859A (en) * | 1955-05-27 | 1957-10-22 | Karl F Ross | Cathode ray filter |
DE1100013B (de) * | 1958-09-16 | 1961-02-23 | Rheinpreussen Ag | Verfahren zur kontinuierlichen Herstellung von niedermolekularen, nicht harzartigen Kondensations-produkten aus Carbonylverbindungen |
US3161801A (en) * | 1960-03-31 | 1964-12-15 | Allen Joseph Stevens | Delay apparatus and method employing electron stream |
Also Published As
Publication number | Publication date |
---|---|
BE470043A (th) |
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