US3727094A - Leakage inhibiting sheilding means - Google Patents

Leakage inhibiting sheilding means Download PDF

Info

Publication number: US3727094A
Authority: US; United States
Prior art keywords: projecting portion; leads; shielding means; annular; basal perimeter
Prior art date: 1972-08-03
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

US00277616A

Other languages

English (en)

Inventor

H Roeber

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.)

GTE Sylvania Inc

Original Assignee

GTE Sylvania Inc

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.)

1972-08-03

Filing date

1972-08-03

Publication date

1973-04-10

1972-08-03 Application filed by GTE Sylvania Inc filed Critical GTE Sylvania Inc

1973-04-10 Application granted granted Critical

1973-04-10 Publication of US3727094A publication Critical patent/US3727094A/en

1981-08-24 Assigned to NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP. reassignment NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP. ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981. (SEE DOCUMENT FOR DETAILS). Assignors: GTE PRODUCTS CORPORATION A DE CORP.

1990-04-10 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

230000002401 inhibitory effect Effects 0.000 title claims abstract description 13
239000011324 bead Substances 0.000 claims abstract description 18
230000002787 reinforcement Effects 0.000 claims abstract description 12
238000007493 shaping process Methods 0.000 claims abstract description 9
230000009286 beneficial effect Effects 0.000 claims abstract description 6
230000003319 supportive effect Effects 0.000 claims description 5
230000001154 acute effect Effects 0.000 claims description 4
239000011521 glass Substances 0.000 claims description 2
230000015572 biosynthetic process Effects 0.000 abstract description 10
230000000694 effects Effects 0.000 abstract description 8
230000002093 peripheral effect Effects 0.000 abstract description 2
238000000859 sublimation Methods 0.000 description 5
230000008022 sublimation Effects 0.000 description 5
239000004020 conductor Substances 0.000 description 3
238000010276 construction Methods 0.000 description 2
230000002939 deleterious effect Effects 0.000 description 2
238000004519 manufacturing process Methods 0.000 description 2
238000000034 method Methods 0.000 description 2
230000003247 decreasing effect Effects 0.000 description 1
230000007812 deficiency Effects 0.000 description 1
230000001627 detrimental effect Effects 0.000 description 1
230000005764 inhibitory process Effects 0.000 description 1
238000002955 isolation Methods 0.000 description 1
239000000463 material Substances 0.000 description 1
238000012986 modification Methods 0.000 description 1
230000004048 modification Effects 0.000 description 1
230000036961 partial effect Effects 0.000 description 1
230000001737 promoting effect Effects 0.000 description 1
230000001681 protective effect Effects 0.000 description 1
230000000717 retained effect Effects 0.000 description 1

Images

Classifications

- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
- H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
- H01J19/44—Insulation between electrodes or supports within the vacuum space

Definitions

ABSTRACT A shielding means for inhibiting the formation of electrical leakage between the stem leads of an electron discharge device, is a substantially infundibular shaped member formed for umbrella-fashion-attachment to an individual lead to effect better shielding of the bead area surrounding the lead.
This invention relates to shielding means for an electron discharge device and more particularly'to improved means for reducing electrical leakage therein.
a conventional form of an electron tube vertical array and extend through the closure member in a manner to conserve space, thereby keeping the physical magnitude of the tube structure to a desirable perimeter of the funnel.
the cylindrical tube-like portion of the funnel is pressured against the lead and often deformed by the attaching procedure. Degrees of this reshaping pressure are transferred to the cone portion causing deformation thereof and a resultant bowing of the annular ledge.
Such deformation of the shielding means reduces the protective efficiency thereof; as an elliptiminimal size.
Such compactness often creates a problem in achieving desired electrical isolation of the leads which individually conduct electrical potentials of different levels.
the umbrella effect of the shielding means is intended to prevent the formation of a continuous leakage path between leads.
the "eyelet shielding means of the prior art is of funnel-like construction having an annular ledge outstanding from the cal shaping of the conic section and resultant upward bowing of the ledge diminishes the amount of desired shielding, thereby lessening the inhibition of leakage path formation.
Another object of this invention is to provide an improved shielding means embodying reinforcement and structural rigidity characteristics that are retained in the completed device to accomplish the intended protectional results.
an improved shielding means that is a substantially infundibular shaped metallic-structure formed to be attached in umbrella-fashion on each of several leads to effect shielding of the bead area surrounding the lead.
the hollow conic section extending below the tube-like attachment portion, has an annular projecting portion outstanding from its basal perimeter. From the outer periphery of the projection, an integral upward turned portion extends in a discretely shaped relationship to effect beneficial structural reinforcement and rigidity,
FIG. I a sectional view of a prior art funnel-like shielding member 11 oriented on a stem lead 13 adjacent to the bead area surrounding the lead.
the encompassing cylindrical tube-like attachment portion 17 of the shielding member 11 was pressured against the lead 13 and somewhat deformed by the bonding procedure.
sufficient pressure from this deformation was transferred to cone portion 19 causing a substantially elliptical reshaping thereof and effecting a resultant upward bowing of the annular ledge 21.
Such reshaping and bowing decreased effective shielding protection.
FIGS. 2 and 3 there is shown an embodiment of the improved shielding means 23, which has a longitudinal axis 25 therethrough, is comprised of a hollow conic section 27 having a conical wall portion 29 with an open apex 31.
the annular projecting portion 43 Integral with the open apex 31 and extending longitudinally upward therefrom is a terminal cylindrical tube-like section 35 ment illustrated in FIGS. 2 and 3, the annular projecting portion 43 is flared outward as a substantially conical shaping extending from and forward of the basal perimeter 33.
the upward turned portion 41 is formed as an upstanding closed wall integrally extending from the periphery of the conical projecting portion 43 in acute angular orientation, the wall being directed toward the tube-like section 35 in a manner substantially parallel with the longitudinal axis 25. This acute angular relationship between the upstanding wall 45 and the flared annular projecting portion 43 provides beneficial structural reinforcement and rigidity.
a partial sectional portion of a representative electron discharge device 47 is shown, which may be the basal end of a cathode ray tube though not necessarily limited to such.
the envelope portion 49 is hermetically sealed to a substantially discshaped stem 51 which comprises a wafer member 53 having an interior surface 55 and an exterior surface 57.
the wafer closure member 53 includes a concentrically located sealed exhaust tubulation 59 about which a plurality of spaced electrical conductors or leads 61 are vertically disposed in substantially circular array and hermetically sealed in the wafer member 53 in parallel alignment to extend through both surfaces 55 and 57 thereof.
a function of the beads is to provide increased gIass-tometal seal area and also give support and impart rigidity to the leads 61.
the aforedescribed improved shielding means 23 are attached, as by welds or swages 65 to the leads 61 in umbrella-fashion at a position thereon adjacent to the beads to provide adequate shielding protection to the bead areas 63.
the interior terminal ends 67 of the leads 61 are suitably disposed for attachment to the mount structure or electron gun assembly, not shown, from whence sublimation emanates during device operation, a portion of which is directed toward the beads 63 and the interior surface 55 of the stem 51. It is evident that unless some protection is afforded, a sublimation film of conductive material spuriously emanating from the electron gun or emission source will result in the formation of electrical leakage paths on the interior surface 55 between the several leads 61 disposed therethrough.
the improved shielding means 23 is advantageously formed to retain its intended shaping.
the angular relationship between the annular projecting portion 37 and the upward turned portion 41 effects positive structural reinforcement and rigidity which minimizes distortion of the conical wall portion 27 and prevents bowing of the structure.
FIG. 5 there is shown another embodiment of the invention 69 wherein the annular projecting portion 71, extending outward from the basal perimeter 73 of the conical wall 72, is formed as a plane substantially normal to the longitudinal axis 25, as indicated by the 90 angle a.
the planar projection 71 has an outer periphery 75 from which an upward turned portion 77 is formed as an upstanding wall in a manner substantially normal to the plane of the planar projection, as referenced by the angle B.
the angular relationship of the projecting portion 71 and the upward turned wall 77 likewise effects structural reinforcement and rigidity in this embodiment.
FIG. 6 An additional embodiment of the invention 79 is shown in FIG. 6.
the annular projecting portion 81 extending outward from the basal perimeter 73' of the conical wall 72', is formed as a plane substantially normal to the longitudinal axis 25, as delineated by the angle a.
the upward turned portion 83 is formed from the periphery 82 of the planar projecting portion 81 as an inwardly turned annular roll formed toward the basal perimeter 73 in a manner to encompass the same and effect positive structural reinforcement.
a structurally reinforced shielding means for more positively inhibiting the formation of sublimation induced electrical leakage paths between the several stem beads in an electron discharge device, thereby assuring greater reliability of operation.
Metallic shielding means for inhibiting leakage between the stem leads of an electron discharge device employing a wafer closure member wherethrough a plurality of supportive and electrical connective leads are hermetically disposed in a spaced array, said shielding means being a substantially infundibular shaped member formed for separate attachment to individual leads of said wafer and comprising: 7
annular projecting portion is flared outward as a substantially conical shaping from and forward of said basal perimeter, and whereof said upward turned portion is formed from the periphery of said projecting portion as an inwardly turned annular roll formed toward said basal perimeter in a manner to encompass the same.
a cathode ray tube having a wafer closure member wherethrough a plurality of electrical connective and supportive leads are arranged to accommodate an electron gun, said leads being hermetically disposed in spaced array whereof each of said leads has an encircling bead of glass therearound integral to the interior surface of said closure member; a plurality of substantially infundibular shaped metallic shielding members tially normal to the plane of said planar annular projecting portion.
each of said shielding members comprising:
a hollow conic section having a conical wall portion, an open apex, an opposed basal perimeter and a longitudinal axis extending therethrough;

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Electron Sources, Ion Sources (AREA)

US00277616A 1972-08-03 1972-08-03 Leakage inhibiting sheilding means Expired - Lifetime US3727094A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US27761672A	1972-08-03	1972-08-03

Publications (1)

Publication Number	Publication Date
US3727094A true US3727094A (en)	1973-04-10

Family

ID=23061644

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
US00277616A Expired - Lifetime US3727094A (en)	1972-08-03	1972-08-03	Leakage inhibiting sheilding means

Country Status (2)

Country	Link
US (1)	US3727094A (fr)
BE (1)	BE803157A (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3376448A (en) *	1966-01-14	1968-04-02	Nat Video Corp	Means for shielding electron guns of cathode ray tubes against spurious charges

1972
- 1972-08-03 US US00277616A patent/US3727094A/en not_active Expired - Lifetime
1973
- 1973-08-03 BE BE2052961A patent/BE803157A/fr unknown

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3376448A (en) *	1966-01-14	1968-04-02	Nat Video Corp	Means for shielding electron guns of cathode ray tubes against spurious charges

Also Published As

Publication number	Publication date
BE803157A (fr)	1974-02-04

Legal Events

Date

Code

Title

Description

1981-08-24

AS

Assignment

Owner name: NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP.,

Free format text: ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981.;ASSIGNOR:GTE PRODUCTS CORPORATION A DE CORP.;REEL/FRAME:003992/0284

Effective date: 19810708

Owner name: NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP.