US3601648A - A conductive film for electromagnetic deflection device - Google Patents

A conductive film for electromagnetic deflection device Download PDF

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Publication number
US3601648A
US3601648A US740340A US3601648DA US3601648A US 3601648 A US3601648 A US 3601648A US 740340 A US740340 A US 740340A US 3601648D A US3601648D A US 3601648DA US 3601648 A US3601648 A US 3601648A
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US
United States
Prior art keywords
conductive film
frequency
deflection device
deflection
coil means
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
Application number
US740340A
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English (en)
Inventor
Yoshihiro Uno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Application granted granted Critical
Publication of US3601648A publication Critical patent/US3601648A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4824—Constructional arrangements of electrodes
    • H01J2229/4827—Electrodes formed on surface of common cylindrical support

Definitions

  • FIG. I is a side view showing the main portion of the electromagnetic deflection device according to an embodiment of the present invention.
  • FIGS. 2 and 3 are side views showing the main portions of other embodiments of the present invention.
  • the reference numeral 1 represents a glass envelope forming a cathode-ray tube, 2 a deflection coil, and 4 a deflection signal source by which a high frequency magnetic field is set up in the directions indicated by arrows 4.
  • the reference numeral 5 indicates a helical conductive film which is provided on the inner surface of the envelope in such a manner as to cover either the entire area which is under the influence of a magnetic field produced by the deflection coil 2 or the area corresponding to a relatively strong portion of the magnetic field.
  • On the opposite sides of the spiral conductive film there are provided uniform conductive films 6 and 7.
  • FIG. 2 there is shown another embodiment of the present invention wherein separate parallel bandlike conductive films are provided instead of the helical conductive film 5. That is, gaps 16 are formed between the bandlike conductive films.
  • This embodiment is not so effective as the first embodiment using the helically wound conductive film, but a practically sufficient effect can be obtained.
  • the conductive film applying method for a post-acceleration type cathode-ray tube may be directly used for the embodiment of FIG. 1.
  • the same purpose can be achieved by vacuum-depositing metal through a mask of required shape, By the latter method, a conductive film of a complicated shape such as shown in FIG. 3 can easily be formed.
  • the high-frequency electromagnetic deflection as described above can be utilized in an attempt to effect an electron-beam modulation type high-frequency wobbling deflection wherein an electron beam is deflected by a signal so that the electron beam density is modulated in accordance with the speed of deflection or to achieve high-speed marking or recording,
  • An induction current reducing device for an electromagnetic deflection device of a High-frequency magnetic deflection type cathode ray tube comprising an insulating envelope defining a vacuum, high-frequency deflection coil means mounted on a part of the outside surface of said envelope, a conductive film coated on the inside surface thereof, and means reducing induction current flowing through the conductive film due to the high-frequency operation of said deflection coil means, including at least one nonconductive gap region provided in said film at a place which traverses the high-frequency deflecting magnetic field of said coil means.
  • An electromagnetic deflection device of a high-frequency magnetic deflection type cathode-ray tube comprising an insulating envelope defining a vacuum therein, said envelope defining a tubular portion through which an electron beam is directed, high-frequency deflection coil means mounted on a part of the outside surface of said tubular portion, a conductive film coated on the inside surface of said tubular portion and means reducing induction current flowing through the conductive film due to the high-frequency operation of said deflection coil means, including at least one nonconductive gap region provided in said film at a place which traverses the high-frequency deflecting magnetic field of said coil means.
  • said nonconductive gap region comprises a plurality of parallel band-shaped gaps with an equal distance therebetween.

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  • Physical Vapour Deposition (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US740340A 1967-07-11 1968-06-26 A conductive film for electromagnetic deflection device Expired - Lifetime US3601648A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4517667 1967-07-11

Publications (1)

Publication Number Publication Date
US3601648A true US3601648A (en) 1971-08-24

Family

ID=12711944

Family Applications (1)

Application Number Title Priority Date Filing Date
US740340A Expired - Lifetime US3601648A (en) 1967-07-11 1968-06-26 A conductive film for electromagnetic deflection device

Country Status (4)

Country Link
US (1) US3601648A (enrdf_load_stackoverflow)
FR (1) FR1574321A (enrdf_load_stackoverflow)
GB (1) GB1230019A (enrdf_load_stackoverflow)
NL (1) NL6809662A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4237438A (en) * 1978-12-19 1980-12-02 Rca Corporation High resistance continuous shield for reduced capacitive coupling in a deflection yoke
US4663560A (en) * 1983-11-07 1987-05-05 Hitachi, Ltd Magnetic focus and electrostatic deflection type image pick-up tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164202A (en) * 1984-09-05 1986-03-12 Philips Electronic Associated Charged particle beam apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2569654A (en) * 1948-11-19 1951-10-02 John M Cage Cathode-ray tube
CA682302A (en) * 1964-03-17 General Electric Company High resolution electron discharge device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA682302A (en) * 1964-03-17 General Electric Company High resolution electron discharge device
US2569654A (en) * 1948-11-19 1951-10-02 John M Cage Cathode-ray tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4237438A (en) * 1978-12-19 1980-12-02 Rca Corporation High resistance continuous shield for reduced capacitive coupling in a deflection yoke
US4663560A (en) * 1983-11-07 1987-05-05 Hitachi, Ltd Magnetic focus and electrostatic deflection type image pick-up tube

Also Published As

Publication number Publication date
FR1574321A (enrdf_load_stackoverflow) 1969-07-11
NL6809662A (enrdf_load_stackoverflow) 1969-01-14
GB1230019A (enrdf_load_stackoverflow) 1971-04-28

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