EP0362979B1 - Socket for a cathode-ray tube - Google Patents

Socket for a cathode-ray tube Download PDF

Info

Publication number
EP0362979B1
EP0362979B1 EP89303168A EP89303168A EP0362979B1 EP 0362979 B1 EP0362979 B1 EP 0362979B1 EP 89303168 A EP89303168 A EP 89303168A EP 89303168 A EP89303168 A EP 89303168A EP 0362979 B1 EP0362979 B1 EP 0362979B1
Authority
EP
European Patent Office
Prior art keywords
socket
focusing
socket body
cathode
contact
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
EP89303168A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0362979A1 (en
Inventor
Shigetoshi S M K Co. Ltd. Ogata
Atsushi S M K Co. Ltd. Arai
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.)
SMK Corp
Original Assignee
SMK Corp
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 SMK Corp filed Critical SMK Corp
Publication of EP0362979A1 publication Critical patent/EP0362979A1/en
Application granted granted Critical
Publication of EP0362979B1 publication Critical patent/EP0362979B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R33/00—Coupling devices specially adapted for supporting apparatus and having one part acting as a holder providing support and electrical connection via a counterpart which is structurally associated with the apparatus, e.g. lamp holders; Separate parts thereof
    • H01R33/74—Devices having four or more poles, e.g. holders for compact fluorescent lamps
    • H01R33/76—Holders with sockets, clips, or analogous contacts adapted for axially-sliding engagement with parallely-arranged pins, blades, or analogous contacts on counterpart, e.g. electronic tube socket
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R33/00—Coupling devices specially adapted for supporting apparatus and having one part acting as a holder providing support and electrical connection via a counterpart which is structurally associated with the apparatus, e.g. lamp holders; Separate parts thereof
    • H01R33/74—Devices having four or more poles, e.g. holders for compact fluorescent lamps
    • H01R33/76—Holders with sockets, clips, or analogous contacts adapted for axially-sliding engagement with parallely-arranged pins, blades, or analogous contacts on counterpart, e.g. electronic tube socket
    • H01R33/7607—Holders with sockets, clips, or analogous contacts adapted for axially-sliding engagement with parallely-arranged pins, blades, or analogous contacts on counterpart, e.g. electronic tube socket the parallel terminal pins having a circular disposition
    • H01R33/7635—Holders with sockets, clips, or analogous contacts adapted for axially-sliding engagement with parallely-arranged pins, blades, or analogous contacts on counterpart, e.g. electronic tube socket the parallel terminal pins having a circular disposition the terminals being collectively connected, e.g. to a PCB

Definitions

  • This invention relates to a socket for a cathode-ray tube (hereinafter referred to as a "CRT socket") used specifically in a color television receiver.
  • CRT socket a cathode-ray tube
  • ordinary cathode-ray tubes generally have stem pins (electrode terminals) which are disposed circularly around a venting stem portion so that the electrodes other than an anode electrode can be supplied with electric voltage from contacts of the CRT socket through the stem pins.
  • stem pins electrode terminals
  • the CRT sockets have been susceptible to dielectric breakdown between a focusing contact and the adjacent contact during service.
  • the breakdown between the focusing contact and the adjacent contacts is caused by electric discharge or surface leak of an electric current flowing through the contacts.
  • an electric surface leakage is apt to occur.
  • FIGs 1(A) to 1(D) is illustrated an example of a conventional CRT socket.
  • a tube neck portion 1 of the cathode-ray tube (CRT) has a focusing stem pin 2 and some other stem pins 3 which protrude from the end surface of the neck portion 1 and are arranged circularly around a venting stem portion 1a.
  • a terminal support base 4 is fitted so as to permit the stem pins 2, 3 to be retained in the state penetrating the support base 4 as shown in Figure 1(A).
  • the terminal support base 4 and the neck portion 1 are adhered to each other with insulation bonding agent 6 of synthetic resin or the like as shown in Figure 1(C).
  • the terminal support base 4 has an insulation barrier means 5 formed in a hollow shape so as to encircle the focusing stem pin 2.
  • the CRT socket has a cylindrical centre hole 11 passing from the upper surface through to the lower surface of a socket body 10 as shown in Figures 1(B) and 1(C).
  • a focusing contact hole 12 and other contact holes 13 Around the centre hole 11 there are bored a focusing contact hole 12 and other contact holes 13. That is, the focusing contact hole 12 accommodates the focusing contact 14 having a lead terminal 14a.
  • This lead terminal 14a extends toward the upper right in Figure 1(C) so that it can be electrically connected to an external lead wire in an insulation barrier frame 15.
  • contacts 16 each having a lead terminal 16a which is arranged along the lower surface of the socket body 10 so that the leading end of the lead terminal 16a can be soldered to a printed wiring line on a printed circuit board 17.
  • a barrier fitting groove 18 for tightly receiving the insulation barrier means 5 formed on the aforesaid terminal support base 4.
  • EP-A-0 173 790 describes a socket of this type with a high voltage protective groove communicating with the central hole and a protective member inserted in the groove; ribs are formed on the cover member to increase the creeping distance inside the cover member.
  • the CRT socket thus constructed entails a disadvantage in that it becomes too large in height to allow miniaturization of a television receiver.
  • the present invention was made in view of the drawbacks of past CRTs described above and has an object to provide a socket of a cathode-ray tube having a highly reliable structure capable of preventing electric surface leak and dielectric breakdown between a focusing contact and an adjacent contact and soaking of moisture in the air or water produced due to dew condensation into a socket body.
  • a socket for a cathode-ray tube comprising a socket body having a cylindrical centre aperture, a focusing contact hole and other contact holes all of which are circularly arranged around said centre aperture, and a barrier fitting groove which is formed round said focusing contact hole to receive an insulation barrier means so as to protect electrically a focusing contact, characterised in that said socket body is provided with through-slits which are formed between said barrier fitting groove and the respective contact holes adjacent to said focusing contact hole, said slits being open to said centre aperture.
  • the surface conduction routes extending along the surface of the socket body from the focusing contact to the adjacent contacts become sufficiently longer, thereby to prevent electric surface leak of an electric current flowing through the contacts.
  • the through-slit formed in the socket body serves as an air vent hole so as to prevent dew condensation in the socket and dielectric breakdown which is probably brought about between a focusing contact and the other contacts due to the condensation of dew.
  • Figure 1(A) is an exploded perspective view showing a tube neck portion and a terminal support base used in an ordinary cathode-ray tube
  • Figure 1(B) is a perspective view of one example of a conventional socket
  • Figure 1(C) is a sectional side view showing the manner in which the socket of Figure 1(B)is used
  • Figure 1(D) is a partially sectioned, enlarged perspective view of the same
  • Figures 2(A), 2(B), 3 and 4 are explanatory diagrams of other prior art sockets
  • Figure 5 is a perspective view showing one embodiment of the CRT socket, viewed from the top, according to this invention
  • Figure 6 is a bottom view of the same
  • Figure 7 is a partial section view of the socket taken along the line VII-VII in Figure 6
  • Figure 8 is a partially sectioned, enlarged perspective view of the same
  • Figure 9 is a partially sectioned, enlarged perspective view of another embodiment of the invention.
  • reference numeral 20 denotes a socket body of the CRT socket.
  • the socket body 20 has a cylindrical centre hole 21, and a focusing contact hole 22 and other contact holes 23 which are all coaxially arranged around the centre hole 21.
  • a focusing contact 24 is inserted from the upper side of the socket body 20 in Figure 5.
  • a lead terminal 24a extending from the lower part of the focusing contact 24 is laid across the bottom surface of the barrier fitting groove 28 and connected to an external lead wire in an insulation cover 25.
  • contacts 26 are inserted from the lower side of the socket body 20.
  • Lead terminals 26a extending downward from the respective contacts 26 are radially introduced outwardly along the lower surface of the socket body 20.
  • Each leading end portion of the lead terminals 26a is bent at a right angle and pierces through a printed circuit board 27. Then, the leading end of the lead terminal 26a is soldered to a printed wiring line on the lower surface of the printed circuit board 27.
  • the barrier fitting groove 28 is separated from the adjacent contact holes 23 at a distance to the extent that one contact hole can be formed on either side of the barrier fitting groove 28.
  • the socket body 10 there are made hollows 32 which open downwards to save raw materials such as synthetic resin required for moulding the CRT socket.
  • a through-slit 33 In the space between the barrier fitting groove 28 and the adjacent contact hole 23 there is formed a through-slit 33 through which the hollow 32 is open upward and communicates to the centre hole 21.
  • the through-slit 33 is defined among the upper surface of the socket body 20, the inner circumferential wall of the centre hole 21 and the defining surface of the hollow 32.
  • a through-slit 33 is formed on either side of the focusing contact hole 22.
  • the through-slit 33 functions as a ventilating path for allowing air to pass, thereby preventing dew condensation in the socket.
  • the CRT socket described above may be modified as shown in Figure 9.
  • a dent or recess 29b is formed close to the through-slit 33 in the upper surface portion of the socket body 20. Since other elements are identical to the previously described embodiment, like elements are given like reference numerals.
  • the CRT socket of this invention is provided with the through slit which pierces through from the upper surface to the lower surface of the socket body and is open to the cylindrical centre hole in the socket body, whereby the surface conduction routes extending along the surface of the socket body from the focusing contact to the adjacent contacts become sufficiently longer.
  • this invention can provide a highly reliable socket of a cathode-ray tube capable of preventing electric surface leak and dielectric breakdown between the focusing contact and the adjacent contact even if remarkably high voltage is supplied to the focusing electrode of the cathode-ray tube.
  • the through slit formed in the socket body functions as a ventilating path for allowing air to pass, dew condensation in the socket can be prevented.

Landscapes

  • Connecting Device With Holders (AREA)
EP89303168A 1988-09-30 1989-03-30 Socket for a cathode-ray tube Expired - Lifetime EP0362979B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP128483/88 1988-09-30
JP1988128483U JPH0532952Y2 (ko) 1988-09-30 1988-09-30

Publications (2)

Publication Number Publication Date
EP0362979A1 EP0362979A1 (en) 1990-04-11
EP0362979B1 true EP0362979B1 (en) 1994-06-08

Family

ID=14985862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89303168A Expired - Lifetime EP0362979B1 (en) 1988-09-30 1989-03-30 Socket for a cathode-ray tube

Country Status (3)

Country Link
EP (1) EP0362979B1 (ko)
JP (1) JPH0532952Y2 (ko)
KR (1) KR940002901B1 (ko)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100195169B1 (ko) * 1996-02-24 1999-06-15 손욱 음극선관의 리드핀 보호용 프로텍터
JP3295050B2 (ja) * 1999-02-10 2002-06-24 エスエムケイ株式会社 Ｃｒｔソケット
JP3126970B1 (ja) * 2000-01-17 2001-01-22 エスエムケイ株式会社 Ｃｒｔソケット

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4588250A (en) * 1983-10-03 1986-05-13 North American Philips Consumer Electronics Corp. Connective-protective adapter for a CRT base
JPS6136975U (ja) * 1984-08-08 1986-03-07 星電器製造株式会社 陰極線管ソケツト
DE8716179U1 (de) * 1987-12-08 1988-01-28 Karl Jungbecker GmbH & Co, 5960 Olpe Bildröhrenfassung

Also Published As

Publication number Publication date
JPH0532952Y2 (ko) 1993-08-23
KR900005653A (ko) 1990-04-14
KR940002901B1 (ko) 1994-04-06
JPH0249091U (ko) 1990-04-05
EP0362979A1 (en) 1990-04-11

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