US3696266A - Electron beam deflecting device - Google Patents

Electron beam deflecting device Download PDF

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US3696266A
US3696266A US72696A US3696266DA US3696266A US 3696266 A US3696266 A US 3696266A US 72696 A US72696 A US 72696A US 3696266D A US3696266D A US 3696266DA US 3696266 A US3696266 A US 3696266A
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electron beam
slow
wave structure
outer conductor
deflecting device
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US72696A
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Tsutomu Nishino
Yuuji Mogi
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    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/708—Arrangements for deflecting ray or beam in which the transit time of the electrons has to be taken into account
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/30—Syringes for injection by jet action, without needle, e.g. for use with replaceable ampoules or carpules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/24—Slow-wave structures, e.g. delay systems
    • H01J23/26—Helical slow-wave structures; Adjustment therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/78—Tubes with electron stream modulated by deflection in a resonator

Definitions

  • ABSTRACT A device for deflecting an electron beam emitted from an electron gun in a cathode-ray tube, the device being of the type having a helical strip slow-wave structure, wherein the improvement resides in enlarging the passage of the electron beam toward the display screen of the cathode-ray tube with the characteristic impedance of the slow-wave structure maintained constant throughout the length of the slowwave structure.
  • This invention relates to an electron beam deflecting device for use with a cathode-ray tube for the display of waveforms and, more particularly, to an electron beam deflecting device of the type using a helical strip slowwave structure.
  • a deflecting device having parallel-plate electrodes is used in a cathode-ray tube for the direct observation of single-pulse waveforms with an ultra-high frequency and ultra-fast waveforms consisting of ultra-wide band frequency components. Degradation in deflection sensitivity and an inverted deflection of the electron beam is inverted during the electron transit time in the device of this type.
  • a deflecting device using a helical strip slow-wave structure is,,therefore, used in lieu of such conventional device so as to avoid these and other difficulties, providing a uniform deflection sensitivity over a range dc. to thousands of mega-hertz.
  • FIG. 1 is a longitudinal sectional view of an essential part of a travelling-wave deflection device implementing this invention ⁇
  • FIG. 2 is a schematic view showing an example of the applications of the device shown in FIG. 1;
  • FIG. 3 is a plot showing the characteristic impedance VSWR (voltage standing wave ratio) of the device illustrated in FIG. 1.
  • the electron beam deflecting device which is generally represented by reference numeral 10, comprises a helical strip slow-wave structure 11 having an internal bore 12 extending therethrough.
  • the slow-wave structure 10 is enclosed in a cylindrical outer conductor 13.
  • the slow-wave structure and the outer conductor are in coaxial relationship with each other and the electron beam advances in a direction througha passage defined between the two members, the direction of the electron beam being indicated by a broken line b.
  • the combination of the structure 11 andthe outer conductor 13 used as the electron beam deflecting device is know per se.
  • the helical strip slow-wave structure 11 is tapered forwardly on its side defining the passage of the electron beam.
  • the structure 11 is herein shown as tapered at an angle 0 which may be selected as desired.
  • the axis of the cylindrical outer conductor 13 should be inclined at an angle corresponding to one-half of the angle 0 in anopposite direction.
  • the center line of the passage of the electron beam is relatively deviated at an angle 0/2 as indicated by a broken line a.
  • the impedance and the phase characteristic of the helical strip slow-wave structure will be varied toward the outlet of the deflecting device failing to provide a uniform transmission characteristics throughout the length of the deflection device.
  • the bore 12 in the helical structure 11 may be forwardly reduced in diameter so that the reduction in the capacitance resulting from the tapering of the structure 11 is compensated for by decreasing the inductance.
  • FIG. 2 sketchily illustrates an example of applications of the electron beam deflecting device of FIG. 1 in a cathode-ray tube.
  • an electron beam is emitted from the electron gun 14 and deflected vertically when passing through the travelling-wave deflection device 10.
  • the thus deflected beam is further deflected horizontally by the horizontal deflector means 15 and the resultant optical information such as waveforms is displayed on a screen 16 as customary.
  • Designated by reference numeral 10a is an input plug of the travelling-wave deflection device 10.
  • the screen 16 can be scanned over an increased area because of the enlarged passage of the electron beam in the travelling-wave deflection device 10 without inviting a variation in characteristic impedance throughout the length of the device 10.
  • the characteristics impedance of the deflecting device according to the invention is maintained comparable to that attained in the conventional counterpart, as will be understood from observation of FIG. 3.
  • a device for deflecting an electron beam emitted in a direction from an electron gun which comprises:
  • a helical strip slow-wave structure having an axial bore extending therethrough and a predetermined radial thickness and positioned axially within said BEST AVAIL COPY direction at an angle corresponding to twice of the angle at which said outer conductor is inclined from said directiomand said bore being reduced in diameter in said direction.

Abstract

A device for deflecting an electron beam emitted from an electron gun in a cathode-ray tube, the device being of the type having a helical strip slow-wave structure, wherein the improvement resides in enlarging the passage of the electron beam toward the display screen of the cathode-ray tube with the characteristic impedance of the slow-wave structure maintained constant throughout the length of the slow-wave structure.

Description

United States Patent Nishino et a1.
[ 51 Oct. 3, 1972 ELECTRON BEAM DEFLECTING DEVICE [72] Inventors: Tsutomu Nishino; Yuuii Mogi, both of 1006, Oaza Kadoma, Kadoma, Osaka, Japan [22] Filed: Sept. 16, 1970 [21] Appl. No.5 72,696
[30] Foreign Application Priority Data Sept. 19, 1969 Japan ..44/76060 [52] US. Cl. ..315/3, 315/35, 313/83, 313/83 SP [51] Int. Cl ..H01j 29/70, HOlj 25/36, H03h 7/30 [58] Field of Search....3l5/3, 3.5, 3.6; 313/83, 83 SP [56] References Cited UNITED STATES PATENTS 3,174,070 3/1965 Moulton ..315/3 3,376,464 4/1968 Loty et a1. ..315/3 ELECTRON GUN SIDE 3,280,361 10/1966 Goldberg et al. ..315/3 3,118,110 l/l964 Spangenberg ..315/3 X 3,504,222 3/1970 F ukushima ..315/3 3,448,384 6/1969 Scott ..3l5/3.6 X 2,653,270 9/1953 Kompfner ..3 15/ 3.5 2,630,544 3/1953 Tiley ..3 l5/3.6
Primary Examiner-Herman Karl Saalbach Assistant Examiner-Saxfield Chatrnon, Jr. Attorney-John Lezdey [57] ABSTRACT A device for deflecting an electron beam emitted from an electron gun in a cathode-ray tube, the device being of the type having a helical strip slow-wave structure, wherein the improvement resides in enlarging the passage of the electron beam toward the display screen of the cathode-ray tube with the characteristic impedance of the slow-wave structure maintained constant throughout the length of the slowwave structure.
1 Claim, 3 Drawing Figures SCREEN SIDE 1 PATENTED 7 3 I97? 3 6 96. 2 6 6 SHEET 2 0F 2 12 5538mm v ooom coop 88 008 00% 00cm 008 009 mvsmons HMSA ELECTRON BEAM DEFLECTING DEVICE This invention relates to an electron beam deflecting device for use with a cathode-ray tube for the display of waveforms and, more particularly, to an electron beam deflecting device of the type using a helical strip slowwave structure.
A deflecting device having parallel-plate electrodes is used in a cathode-ray tube for the direct observation of single-pulse waveforms with an ultra-high frequency and ultra-fast waveforms consisting of ultra-wide band frequency components. Degradation in deflection sensitivity and an inverted deflection of the electron beam is inverted during the electron transit time in the device of this type. A deflecting device using a helical strip slow-wave structure is,,therefore, used in lieu of such conventional device so as to avoid these and other difficulties, providing a uniform deflection sensitivity over a range dc. to thousands of mega-hertz. Since, however, an amplifier providing a uniform amplification characteristics over such an ultra-wide band is not presently available, drawbacks are still encountered in this advanced deflecting device in that it is practically impossible to reduce the axial length of the device to the order of 3 to 4 centimeters as in a usual parallelplate deflecting device of a low-frequency cathode-ray tube and to have the passage of the electron beam enlarged progressively toward a screen on which the waveforms are to be displayed. One of the reasons accounting for such drawbacks is that the passage of the electron beam should be narrowed as much as possible for increasing the deflection sensitivity and that the physical length of the helical strip slow-wave structure should be elongated to the order of a deflecting action by a travelling-wave electric field for an extended time duration. Another reason is that the characteristic impedance and the phase-velocity characteristics of the helical strip slow-wave structure should be uniform throughout the longitudinal direction of the helical strip slow-wave structure. The effective scanning area of the display screen is thus limited significantly notwithstanding the fact that a deflection sensitivity of several volts per centimeters is available with the deflecting device of the conventional helical strip slowwave structure type.
It is therefore an object of this invention to provide an improved electron beam deflecting device of the type using a helical strip slow-wave structure wherein the passage of the electron beam is enlarged toward the display screen of the cathode-ray tube and consequently the effective scanning area of the screen can be increased, without inviting a substantial variation in the characteristic impedance of the helical slow-wave structure. a In the drawings:
FIG. 1 is a longitudinal sectional view of an essential part of a travelling-wave deflection device implementing this invention{ FIG. 2 is a schematic view showing an example of the applications of the device shown in FIG. 1; and
FIG. 3 is a plot showing the characteristic impedance VSWR (voltage standing wave ratio) of the device illustrated in FIG. 1.
Referring to FIG. 1, the electron beam deflecting device according to this invention, which is generally represented by reference numeral 10, comprises a helical strip slow-wave structure 11 having an internal bore 12 extending therethrough. The slow-wave structure 10 is enclosed in a cylindrical outer conductor 13. In an existing electron beam deflecting device using a helical strip slow-wave structure, the slow-wave structure and the outer conductor are in coaxial relationship with each other and the electron beam advances in a direction througha passage defined between the two members, the direction of the electron beam being indicated by a broken line b. The combination of the structure 11 andthe outer conductor 13 used as the electron beam deflecting device is know per se.
According to this invention, now, the helical strip slow-wave structure 11 is tapered forwardly on its side defining the passage of the electron beam. The structure 11 is herein shown as tapered at an angle 0 which may be selected as desired. In order that the passage of the electron beam be symmetrical with respect to the center line of the beam advancing therethrough, the axis of the cylindrical outer conductor 13 should be inclined at an angle corresponding to one-half of the angle 0 in anopposite direction. As a result, the center line of the passage of the electron beam is relatively deviated at an angle 0/2 as indicated by a broken line a.
The passage of the electron beam thus being enlarged, the impedance and the phase characteristic of the helical strip slow-wave structure will be varied toward the outlet of the deflecting device failing to provide a uniform transmission characteristics throughout the length of the deflection device. To avoid this difficulty, the bore 12 in the helical structure 11 may be forwardly reduced in diameter so that the reduction in the capacitance resulting from the tapering of the structure 11 is compensated for by decreasing the inductance.
FIG. 2 sketchily illustrates an example of applications of the electron beam deflecting device of FIG. 1 in a cathode-ray tube. As shown, an electron beam is emitted from the electron gun 14 and deflected vertically when passing through the travelling-wave deflection device 10. The thus deflected beam is further deflected horizontally by the horizontal deflector means 15 and the resultant optical information such as waveforms is displayed on a screen 16 as customary. Designated by reference numeral 10a is an input plug of the travelling-wave deflection device 10.
It will now be appreciated from the foregoing description that the screen 16 can be scanned over an increased area because of the enlarged passage of the electron beam in the travelling-wave deflection device 10 without inviting a variation in characteristic impedance throughout the length of the device 10. As a matter of fact, the characteristics impedance of the deflecting device according to the invention is maintained comparable to that attained in the conventional counterpart, as will be understood from observation of FIG. 3.
What is claimed is:
l; A device for deflecting an electron beam emitted in a direction from an electron gun, which comprises:
a cylindrical outer conductor the central axis of which is inclined at an angle from said direction; and
a helical strip slow-wave structure having an axial bore extending therethrough and a predetermined radial thickness and positioned axially within said BEST AVAIL COPY direction at an angle corresponding to twice of the angle at which said outer conductor is inclined from said directiomand said bore being reduced in diameter in said direction.
* I I I

Claims (1)

1. A device for deflecting an electron beam emitted in a direction from an electron gun, which comprises: a cylindrical outer conductor the central axis of which is inclined at an angle from said direction; and a helical strip slow-wave structure having an axial bore extending therethrough and a predetermined radial thickness and positioned axially within said cylindrical outer conductor so as to define a passage between one side surface of said slowwave structure and the inneR wall of said outer conductor through which said electron beam is permitted to pass; said one side surface of said slow-wave structure being tapered along said direction at an angle corresponding to twice of the angle at which said outer conductor is inclined from said direction; and said bore being reduced in diameter in said direction.
US72696A 1969-09-19 1970-09-16 Electron beam deflecting device Expired - Lifetime US3696266A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328466A (en) * 1972-07-03 1982-05-04 Watkins-Johnson Company Electron bombarded semiconductor device with doubly-distributed deflection means
US5172029A (en) * 1991-01-22 1992-12-15 The United States Of America As Represented By The United States Department Of Energy Shielded helix traveling wave cathode ray tube deflection structure
US5376864A (en) * 1992-10-29 1994-12-27 The United States Of America As Represented By The Department Of Energy Shielded serpentine traveling wave tube deflection structure

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2422265A2 (en) * 1976-09-21 1979-11-02 Thomson Csf Wave propagation tube with hyperfrequency delay line - having triangular section with three equally inclined flat plates and is supported in tube by bars
FR2457560A1 (en) * 1979-05-23 1980-12-19 Thomson Csf MICROWAVE DELAY LINE COMPRISING A VARIABLE SECTION CONDUCTOR AND PROGRESSIVE WAVE TUBE COMPRISING SUCH A LINE

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2630544A (en) * 1948-03-20 1953-03-03 Philco Corp Traveling wave electronic tube
US2653270A (en) * 1944-06-08 1953-09-22 English Electric Valve Co Ltd High-frequency energy interchange device
US3118110A (en) * 1952-07-15 1964-01-14 Univ Leland Stanford Junior Radio frequency spectrum analyzer including dispersive traveling wave tube elements
US3174070A (en) * 1961-08-14 1965-03-16 Tektronix Inc Electron beam deflection structure with compensation for beam transit time
US3280361A (en) * 1963-02-12 1966-10-18 Edgerton Germeshausen & Grier Electron stream deflection system of folded transmission line type
US3376464A (en) * 1965-11-30 1968-04-02 Lab D Electronique Et De Physi Beam deflection system comprising a flattened helix
US3448384A (en) * 1965-10-23 1969-06-03 Allan W Scott Integral microwave radiating and generating unit for heating
US3504222A (en) * 1966-10-07 1970-03-31 Hitachi Ltd Slow-wave circuit including meander line and shielding therefor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2653270A (en) * 1944-06-08 1953-09-22 English Electric Valve Co Ltd High-frequency energy interchange device
US2630544A (en) * 1948-03-20 1953-03-03 Philco Corp Traveling wave electronic tube
US3118110A (en) * 1952-07-15 1964-01-14 Univ Leland Stanford Junior Radio frequency spectrum analyzer including dispersive traveling wave tube elements
US3174070A (en) * 1961-08-14 1965-03-16 Tektronix Inc Electron beam deflection structure with compensation for beam transit time
US3280361A (en) * 1963-02-12 1966-10-18 Edgerton Germeshausen & Grier Electron stream deflection system of folded transmission line type
US3448384A (en) * 1965-10-23 1969-06-03 Allan W Scott Integral microwave radiating and generating unit for heating
US3376464A (en) * 1965-11-30 1968-04-02 Lab D Electronique Et De Physi Beam deflection system comprising a flattened helix
US3504222A (en) * 1966-10-07 1970-03-31 Hitachi Ltd Slow-wave circuit including meander line and shielding therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328466A (en) * 1972-07-03 1982-05-04 Watkins-Johnson Company Electron bombarded semiconductor device with doubly-distributed deflection means
US5172029A (en) * 1991-01-22 1992-12-15 The United States Of America As Represented By The United States Department Of Energy Shielded helix traveling wave cathode ray tube deflection structure
US5376864A (en) * 1992-10-29 1994-12-27 The United States Of America As Represented By The Department Of Energy Shielded serpentine traveling wave tube deflection structure

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DE2046217A1 (en) 1971-04-01
GB1323900A (en) 1973-07-18
FR2062392A5 (en) 1971-06-25
NL7013834A (en) 1971-03-23
NL143068B (en) 1974-08-15
DE2046217B2 (en) 1976-04-29

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