US3657585A - Thin-window recording tube - Google Patents

Thin-window recording tube Download PDF

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Publication number
US3657585A
US3657585A US90734A US3657585DA US3657585A US 3657585 A US3657585 A US 3657585A US 90734 A US90734 A US 90734A US 3657585D A US3657585D A US 3657585DA US 3657585 A US3657585 A US 3657585A
Authority
US
United States
Prior art keywords
metallic support
transparent sheet
faceplate
metal backing
evacuated envelope
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
US90734A
Other languages
English (en)
Inventor
Hiroshi Miyama
Kaoru Tomii
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 US3657585A publication Critical patent/US3657585A/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
    • H01J29/02—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
    • H01J29/861—Vessels or containers characterised by the form or the structure thereof
    • 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
    • H01J31/06—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 more than two output electrodes, e.g. for multiple switching or counting
    • H01J31/065—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 more than two output electrodes, e.g. for multiple switching or counting for electrography or electrophotography, for transferring a charge pattern through the faceplate

Definitions

  • ABSTRACT A faceplate of a thin-window recording tube comprising a metal backing electrically isolated from the outside of an evacuated envelope of the recording tube.
  • An embodiment of the faceplate has a metallic support the side surfaces of which are covered with an insulating adhesive.
  • Another embodiment has a metallic support the elongated target of which has formed therein a plurality of circular apertures.
  • This invention relates to a thin-window recording tube and more particularly to a faceplate having a metal backing electrically isolated from the outside of an evacuated envelope of the recording tube.
  • a conventional recording tube has a metal backing deposited on its fluorescent layer.
  • the metal backing is scanned by an electron beam for transmitting therethrough the electron beam to the fluorescent layer to cause an optical signal to be produced in the fluorescent layer in accordance with an electric signal borne by the electron beam.
  • the metal backing is electrically connected through a metallic support to the outside of an evacuated envelope of the recording tube. A high positive potential is usually applied to the metal backing. This incurs a serious danger to the operator when in operation.
  • the conventional recording tube also uses a metallic support secured to a thin transparent sheet and having a slit aperture acting as a target for an electron beam.
  • the width of .the slit aperture should be small enough to assure sufficient mechanical strength of the transparent sheet which is subject to a high pressure difference between the inside and outside of the evacuated envelope.
  • the aperture thus, being extremely narrowed, it is difficult to uniformly fit the fluorescent layer into such narrow aperture and to deposit the metal backing on the fluorescent layer. It is also difficult to enable the electron beam to precisely scan the narrow target so as to prevent the electron beam from missing the target.
  • an object of this invention to provide an improved faceplate having a metal backing electrically isolated from the outside of an evacuated envelope of a recording tube.
  • FIG. 1 is a cross-sectional view showing a preferred embodiment of a faceplate according to this invention
  • FIG. 2 is similar to FIG. 1 but shows another preferred embodiment of the invention
  • FIG. 3 is an enlarged top view of a portion of a faceplate shown in FIG. 2;
  • FIG. 4 is a sectional view taken along the line 4-4' of FIG. 3;
  • FIG. 5 is similar to FIG. 4 but is taken along the line 5-5 of FIG. 3.
  • the faceplate comprises a transparent sheet 11 and a metallic support 12 both having a similar coefficient of thermal expansion.
  • the transparent sheet 11 is made of a rigid transparent material such as glass or mica and has substantially the same area as that of the end surface of an evacuated envelope 13 of a recording tube.
  • the metallic support 12 has substantially centrally thereof an elongated target of a slit aperture and is narrower than that of the end surface of the envelope 13.
  • the metallic support 12 is secured to the transparent sheet 11 in alignment therewith to form a junction.
  • a fluorescent material is fit into the slit target and is deposited thereon to form a fluorescent layer 14.
  • the fluorescent layer 14 is coated with a metal backing 15 by vacuum evaporation.
  • the junction which is made up of the fluorescent layer 14 and the metal backing 15 in its slit target, is secured to the end of the evacuated envelope 13 by an adhesive 16 with its metallic support 12 facing an electron gun (not shown) of the recording tube.
  • the adhesive 16 may preferably be of electrically insulating property and may cover not only the inner surface of the metallic support 12 but the side surfaces of the same. Since the metallic support 12 is closely received by the insulating adhesive 16 in such a manner as described above, the metal backing 15 is electrically insulated'from the outside ofthe evacuated envelope 13.
  • an electron beam emitted from the electron gun and indicated at numeral 17 hits lengthwise the metal backing 15 of the slit target, a substantial portion of the electron beam 17 transmits therethrough and causes the fluorescent layer 14 to luminesce in accordance with the electric signal supplied to the electron gun.
  • the metal backing I5 and accordingly the metallic support 12 are biased with a high positive voltage, but, because the metallic support 12 is enclosed with the insulating adhesive 16, there is the operator can be freed of a danger even when the touches the outside of the envelope l3. 1
  • FIGS. 2 to 5 show a more preferre'd embodiment of, a faceplate according to this invention, in which similar numerals indicate corresponding elements of the faceplate.
  • the faceplate As best shown in FIGS. 3 to 5, the faceplate, generally indicated at numeral 20, comprises a junction including a transparent sheet 11' and a coextensive metallic support 12' secured by fusion to each other.
  • the metallic support 12' has substantially centrally thereof an elongated target composed of a plurality of circular apertures.
  • the circular apertures may preferably be arranged in an array and have diameters smaller than that of the electron beam 17.
  • the fluorescent layer 14' is directly deposited on the surface of the transparent sheet 11' opposite to the metallic support 12'. It is quite natural that the fluorescent layer 14' be positioned coextensively with the elongated target.
  • the fluorescent layer 14 is also covered with a metal backing 15'.
  • the junction is secured by an adhesive 16' to the end of the evacuated envelope 13 with its transparent support 12' facing the electron gun.
  • the adhesive 16' need not be of insulating property because the metal backing 15' is electrically isolated by the transparent insulating sheet 11 from the outside of the envelope 13. As shown, it is of no importance whether or not the adhesive 16 does enclose the transparent sheet 11'.
  • the faceplate of the latter embodiment is advantageous in the following respects: It is easy to manufacture because the fluorescent layer and the metal backing can be directly ap plied on the surface of the transparent. sheet without fitting them into an extremely narrow target. With a plurality of circular apertures provided, the effective width of the target is increased without sacrificing the mechanical strength of the faceplate itself. In addition, a higher resolution is available because a plurality of convex lenses are formed of those portions of the transparent material which are raised into the corresponding circular apertures, as shown, when the transparent sheet is fused to the metallic support.
  • a faceplate for a thin-window recording tube having an evacuated envelope and an electron gun, said evacuated envelope having an elongated aperture formed at the end opposite to said electron gun, said faceplate comprising:
  • a junction having a transparent sheet and a metallic support which are secured to each other and have a substantially common coefficient of thermal expansion, said metallic support having a plurality of circular apertures formed to provide a thin window which extends lengthwise and substantially centrally of said metallic support, said transparent sheet being fused to said metallic support so that convex lenses are formed of those portions of said transparent sheet into said apertures,
  • said metal backing being electrically isolated from outside of said evacuated envelope.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
US90734A 1969-11-19 1970-11-18 Thin-window recording tube Expired - Lifetime US3657585A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11042869 1969-11-19
JP9480369 1969-11-25

Publications (1)

Publication Number Publication Date
US3657585A true US3657585A (en) 1972-04-18

Family

ID=26436041

Family Applications (1)

Application Number Title Priority Date Filing Date
US90734A Expired - Lifetime US3657585A (en) 1969-11-19 1970-11-18 Thin-window recording tube

Country Status (3)

Country Link
US (1) US3657585A (enrdf_load_stackoverflow)
DE (1) DE2056965C3 (enrdf_load_stackoverflow)
GB (1) GB1305475A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2581212B1 (fr) * 1985-04-26 1988-06-17 Commissariat Energie Atomique Imprimante a canon a electrons

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1995253A (en) * 1929-01-12 1935-03-19 Knoll Max Cathode ray tube
US2251332A (en) * 1938-03-31 1941-08-05 Bell Telephone Labor Inc Cathode ray device
US2263733A (en) * 1939-02-25 1941-11-25 Rca Corp Cathode ray oscillograph
US3157879A (en) * 1959-12-28 1964-11-17 Ibm Apparatus for printing by means of an electron beam
GB1159288A (en) * 1966-10-21 1969-07-23 Csf Colour Television Receiver Tube

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1995253A (en) * 1929-01-12 1935-03-19 Knoll Max Cathode ray tube
US2251332A (en) * 1938-03-31 1941-08-05 Bell Telephone Labor Inc Cathode ray device
US2263733A (en) * 1939-02-25 1941-11-25 Rca Corp Cathode ray oscillograph
US3157879A (en) * 1959-12-28 1964-11-17 Ibm Apparatus for printing by means of an electron beam
GB1159288A (en) * 1966-10-21 1969-07-23 Csf Colour Television Receiver Tube

Also Published As

Publication number Publication date
GB1305475A (enrdf_load_stackoverflow) 1973-01-31
DE2065634B2 (de) 1977-03-17
DE2056965B2 (enrdf_load_stackoverflow) 1975-04-03
DE2056965C3 (de) 1975-11-13
DE2065634A1 (de) 1974-10-03
DE2056965A1 (de) 1971-05-27

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