JPS5669754A - Magnetic field focusing device - Google Patents

Magnetic field focusing device

Info

Publication number
JPS5669754A
JPS5669754A JP14566379A JP14566379A JPS5669754A JP S5669754 A JPS5669754 A JP S5669754A JP 14566379 A JP14566379 A JP 14566379A JP 14566379 A JP14566379 A JP 14566379A JP S5669754 A JPS5669754 A JP S5669754A
Authority
JP
Japan
Prior art keywords
magnetic
magnet
cylindrical permanent
permanent magnet
focusing device
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.)
Pending
Application number
JP14566379A
Other languages
Japanese (ja)
Inventor
Takao Kageyama
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP14566379A priority Critical patent/JPS5669754A/en
Publication of JPS5669754A publication Critical patent/JPS5669754A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
    • H01J23/087—Magnetic focusing arrangements
    • H01J23/0873—Magnetic focusing arrangements with at least one axial-field reversal along the interaction space, e.g. P.P.M. focusing

Abstract

PURPOSE:To obtain uniform magnetic field distribution without demagnetizing the produced field, by fixing small magnet chips having different dimension on the outer circumferential face of a cylindrical permanent magnet or a pole piece. CONSTITUTION:The periodic field focusing device 1 has such structure that the magnetic poles are faced alternatively against a cylindrical permanent magnet 2 while pole pieces 3 of magnetic member are placed on both end faces of the magnet 2, and rubber magnet chips 4 having different dimension are fixed on the outer circumferential face of the cylindrical permanent magnet 2 or the pole piece 3. The magnetic flux 10 passing through the outer circumference at the portion where the flux density is low due to magnetic polarization is reinforced by a rubber magnet chip 4 to make the distribution of the magnetic flux uniform.
JP14566379A 1979-11-09 1979-11-09 Magnetic field focusing device Pending JPS5669754A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14566379A JPS5669754A (en) 1979-11-09 1979-11-09 Magnetic field focusing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14566379A JPS5669754A (en) 1979-11-09 1979-11-09 Magnetic field focusing device

Publications (1)

Publication Number Publication Date
JPS5669754A true JPS5669754A (en) 1981-06-11

Family

ID=15390207

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14566379A Pending JPS5669754A (en) 1979-11-09 1979-11-09 Magnetic field focusing device

Country Status (1)

Country Link
JP (1) JPS5669754A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5050857A (en) * 1973-09-05 1975-05-07
JPS52107763A (en) * 1976-03-08 1977-09-09 Toshiba Corp Microwave tube unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5050857A (en) * 1973-09-05 1975-05-07
JPS52107763A (en) * 1976-03-08 1977-09-09 Toshiba Corp Microwave tube unit

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