US3619690A - Thin window cathode-ray tube - Google Patents

Thin window cathode-ray tube Download PDF

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Publication number
US3619690A
US3619690A US785632A US3619690DA US3619690A US 3619690 A US3619690 A US 3619690A US 785632 A US785632 A US 785632A US 3619690D A US3619690D A US 3619690DA US 3619690 A US3619690 A US 3619690A
Authority
US
United States
Prior art keywords
ray tube
faceplate
slit
glass plate
thin window
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
US785632A
Other languages
English (en)
Inventor
Kaoru Tomii
Hiroshi Miyama
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
Priority claimed from JP6641068A external-priority patent/JPS4814139B1/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Application granted granted Critical
Publication of US3619690A publication Critical patent/US3619690A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/861—Vessels or containers characterised by the form or the structure thereof
    • 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/24—Supports for luminescent material
    • 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/121—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen tubes for oscillography
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H01J5/18—Windows permeable to X-rays, gamma-rays, or particles

Definitions

  • This invention relates to a thin window cathode-ray tube and more particularly to a thin window cathode-ray tube which uses very thin glass or mica as faceplate and is mainly used for recording.
  • the face of a conventional thin window cathode-ray tube is constructed by forming a slender rectangular slit 1 at the center of the face of a fiat envelope 2 as shown in FIGS. 1 and 2, then binding a faceplate 6 composed of a thin glass plate or mica plate, a fluorescent material 4 applied on the plate and a film of conductive material formed on the fluorescent material by an adhesive 7 to the envelope face as shown in FIG. 3.
  • This construction maintains the contact between the conductive film 5 of the faceplate and a conductive film 3 which extends from the inner surface of the envelope to the face surface of the envelope and at the same time vacuumtightness of the envelope 2 is obtained.
  • the adhesive 7 sometimes flows into the slit 1 in such a conventional thin window cathode-ray tube: further it is very difi'tcult to apply the adhesive 7 as thin as possible and as near as possible to the slit 1. Therefore it is often not possible to maintain the contact between the conductive film 5 of the faceplate 6 and the conductive film 3 on the inner surface of the envelope and at the same time to obtain the vacuumtightness and resistivity to the atmospheric pressure of the envelope 2.
  • the width of the slit 1 is required to be very narrow from a viewpoint of strength since the glass or mica of the faceplate 6 is very thin.
  • One object of the present invention is to provide a thin window cathode-ray tube which can offset such conventional defects as described above, be easily manufactured and is mechanically strong.
  • Another object of the present invention is to provide a thin window cathode-ray tube in which the envelope and faceplate are bound by an adhesive and there is provided a structure having different steps at least on one side of the junction surface.
  • the face of the thin window cathode-ray tube according to the present invention is constructed by interposing a glass having a slender slit between the thin transparent plate such as glass plate or mica and the envelope; therefore, the application of a fluorescent material, formation of a metal-back electrode and binding to the envelope can be carried out after the thin transparent plate is bound to the glass having a slender slit.
  • the construction of the device becomes greatly simplified since there is little need to take into account the mechanical strength of the thin transparent plate, and there is no possibility that the fluorescent material will be contaminated by the adhesive since only the binding of the glass to the envelope is required.
  • FIG. 1 is a view of the face surface of a flat envelope for a conventional thin window cathode-ray tube and FIG. 2 is a sectional view of a portion of the tube;
  • FIG. 3 is a sectional view of a portion of a thin window cathode-ray tube using a conventional flat envelope
  • FIG. 4 is a sectional view of the face surface of a thin window cathode-ray tube of an embodiment according to the present invention.
  • FIG. 5 is an end view of a thin window cathode-ray tube of another embodiment according to the present invention.
  • FIG. 6 is a sectional view of the interior of, and in the same plane as, the tube shown in FIG. 5;
  • FIG. 7 is a perspective view of a metal fitting used in the thin window cathode-ray tube shown in FIG. 5.
  • the embodiment shown in FIG. 4 is constructed by forming steps 8 and 9 near a slit 1 at the face surface of an envelope 2, applying an adhesive 7 to a recess 9 and binding a faceplate 6 provided with a fluorescent material 4 and conductive film 5 to the envelope 2.
  • the conductive film 5 provided on th-: faceplate 6 is in contact with the conductive film 3 provided on the inner surface of the envelope 2 at the portion of the step 8 provided at the face of the envelope 2.
  • the adhesive 7 is prevented from flowing into the slit 1 and at the same time a thin window cathode-ray tube having a slit of desired size can be easily manufactured by means of this method.
  • FIGS. 5 and 6 are views illustrating another embodiment of the present invention, in which a slit I2 and projection 13 are provided at the face portion of an envelope II.
  • the reference numeral 14 indicates an inner conductive film provided on the inner surface of the envelope l1; 15 indicates a glass provided with a slender slit 16 having a step 8.
  • An adhesive 18 such as frit is applied to a recess 9 of the glass 15 to bind a faceplate l7 composed of, for example, a thin glass microsheet or mica.
  • the reference numeral 19 indicates a fluorescent material applied on the inner surface of the faceplate l7 and 20 indicates a metal-back electrode formed by means of, for example, vacuum evaporation of aluminum on a portion of the fluorescent material 19 and undersurface of the glass 15 and on the inner surface of the slit 16.
  • Reference number 21 designates a frit glass for binding glass 15 and envelop 13; reference numeral 22 designates a metal fitting which forms an electrical conductive path between inner conductive film l4 and metal-back electrode 20. Fitting 22 has opposed supporting projections 23 in contact with conductive film l4 and a contact portion 24 at the center which makes contact with metal-back electrode 20 on the inner surface of the glass 15. The center limb of metal fitting 22 and contact portion 24 form a I-shape, as seen in FIG. 6.
  • the length of contact portion 24 is made slightly larger than the width of groove 16 and the height of said center limb is so selected that the metal fitting 22 electrically connects electrode 20 and conductor film 14 with the center limb sightly bent so as to maintain a pressure contact between film 14 and fitting 22 and between electrode 20 and fitting 22.
  • Two such metal fittings are employed in the preferred embodiment of this invention, provided one at each end of groove 16.
  • the thin window cathode-ray tube of the present invention is constructed as follows: first the glass microsheet I7 is bound to the glass 15 and the fluorescent material 19 is applied; then the metal-back electrode 20 is formed; and next the glass 15 is bound by the frit glass 21 to the envelope 1].
  • the inner conductive film 14 is kept in contact with the metal-back electrode 20 by means of the elastic metal fitting 22.
  • a thin window cathode-ray tube comprising: a conductive film disposed on the inner surface of said tube; the front surface of said tube having a slit defined therein and a projection substantially surrounding said slit; a relatively thin faceplate; a glass plate, having a slit defined therein coincident with said slit defined in said tube, disposed on said front surface of said tube between said faceplate and said projection; said glass plate having a stepped portion on its surface confronting said faceplate; said glass plate having a recessed portion containing an adhesive material for securing said faceplate to said glass plate; and a fluorescent material and a metal-back electrode electrically connected to said conductive film disposed on a portion of the inner surface of said faceplate exposed to the inside of said tube through the slit in said glass plate.
  • a thin window cathode-ray tube wherein said metal-back electrode is formed on said fluorescent material and further comprising means, including at least one metal fitting, electrically connecting said conductive film and said metal-back electrode.
  • said second and third portions have a T-shaped cross section, and said second portion is dimensionally larger than the width of the slit defined in said glass plate to form a press fit with said back electrode.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US785632A 1967-12-28 1968-12-20 Thin window cathode-ray tube Expired - Lifetime US3619690A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11268 1967-12-28
JP6641068A JPS4814139B1 (enrdf_load_stackoverflow) 1968-09-13 1968-09-13

Publications (1)

Publication Number Publication Date
US3619690A true US3619690A (en) 1971-11-09

Family

ID=26333028

Family Applications (1)

Application Number Title Priority Date Filing Date
US785632A Expired - Lifetime US3619690A (en) 1967-12-28 1968-12-20 Thin window cathode-ray tube

Country Status (4)

Country Link
US (1) US3619690A (enrdf_load_stackoverflow)
FR (1) FR1603860A (enrdf_load_stackoverflow)
GB (1) GB1252290A (enrdf_load_stackoverflow)
NL (1) NL148183B (enrdf_load_stackoverflow)

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* Cited by examiner, † Cited by third party
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JP2005539351A (ja) 2002-09-13 2005-12-22 モックステック・インコーポレーテッド 放射窓及びその製造方法
US7428298B2 (en) 2005-03-31 2008-09-23 Moxtek, Inc. Magnetic head for X-ray source
US7382862B2 (en) 2005-09-30 2008-06-03 Moxtek, Inc. X-ray tube cathode with reduced unintended electrical field emission
US7737424B2 (en) 2007-06-01 2010-06-15 Moxtek, Inc. X-ray window with grid structure
US7529345B2 (en) 2007-07-18 2009-05-05 Moxtek, Inc. Cathode header optic for x-ray tube
WO2009045915A2 (en) 2007-09-28 2009-04-09 Brigham Young University Carbon nanotube assembly
US8498381B2 (en) 2010-10-07 2013-07-30 Moxtek, Inc. Polymer layer on X-ray window
US9305735B2 (en) 2007-09-28 2016-04-05 Brigham Young University Reinforced polymer x-ray window
EP2195860A4 (en) 2007-09-28 2010-11-24 Univ Brigham Young X-RAY WINDOW WITH CARBON NANOTUBE FRAME
US8247971B1 (en) 2009-03-19 2012-08-21 Moxtek, Inc. Resistively heated small planar filament
US7983394B2 (en) 2009-12-17 2011-07-19 Moxtek, Inc. Multiple wavelength X-ray source
US8995621B2 (en) 2010-09-24 2015-03-31 Moxtek, Inc. Compact X-ray source
US8526574B2 (en) 2010-09-24 2013-09-03 Moxtek, Inc. Capacitor AC power coupling across high DC voltage differential
US8804910B1 (en) 2011-01-24 2014-08-12 Moxtek, Inc. Reduced power consumption X-ray source
US8750458B1 (en) 2011-02-17 2014-06-10 Moxtek, Inc. Cold electron number amplifier
US8929515B2 (en) 2011-02-23 2015-01-06 Moxtek, Inc. Multiple-size support for X-ray window
US8792619B2 (en) 2011-03-30 2014-07-29 Moxtek, Inc. X-ray tube with semiconductor coating
US9174412B2 (en) 2011-05-16 2015-11-03 Brigham Young University High strength carbon fiber composite wafers for microfabrication
US9076628B2 (en) 2011-05-16 2015-07-07 Brigham Young University Variable radius taper x-ray window support structure
US8989354B2 (en) 2011-05-16 2015-03-24 Brigham Young University Carbon composite support structure
US8817950B2 (en) 2011-12-22 2014-08-26 Moxtek, Inc. X-ray tube to power supply connector
US8761344B2 (en) 2011-12-29 2014-06-24 Moxtek, Inc. Small x-ray tube with electron beam control optics
US9072154B2 (en) 2012-12-21 2015-06-30 Moxtek, Inc. Grid voltage generation for x-ray tube
US9177755B2 (en) 2013-03-04 2015-11-03 Moxtek, Inc. Multi-target X-ray tube with stationary electron beam position
US9184020B2 (en) 2013-03-04 2015-11-10 Moxtek, Inc. Tiltable or deflectable anode x-ray tube
US9173623B2 (en) 2013-04-19 2015-11-03 Samuel Soonho Lee X-ray tube and receiver inside mouth

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472988A (en) * 1944-10-28 1949-06-14 Scophony Corp Of America Apparatus for reproducing electric signals, particularly television reproducers
US2730637A (en) * 1952-05-24 1956-01-10 Zed J Atlee X-ray tubes with low-absorption windows

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472988A (en) * 1944-10-28 1949-06-14 Scophony Corp Of America Apparatus for reproducing electric signals, particularly television reproducers
US2730637A (en) * 1952-05-24 1956-01-10 Zed J Atlee X-ray tubes with low-absorption windows

Also Published As

Publication number Publication date
NL6818609A (enrdf_load_stackoverflow) 1969-07-01
FR1603860A (enrdf_load_stackoverflow) 1971-06-07
NL148183B (nl) 1975-12-15
GB1252290A (enrdf_load_stackoverflow) 1971-11-03
DE1816679B2 (de) 1972-10-26
DE1816679A1 (de) 1970-02-26

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