US3675062A - Method and apparatus for connecting to a nesa layer - Google Patents

Method and apparatus for connecting to a nesa layer Download PDF

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Publication number
US3675062A
US3675062A US25192A US3675062DA US3675062A US 3675062 A US3675062 A US 3675062A US 25192 A US25192 A US 25192A US 3675062D A US3675062D A US 3675062DA US 3675062 A US3675062 A US 3675062A
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US
United States
Prior art keywords
layer
nesa
hole
plug
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
US25192A
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English (en)
Inventor
Gunter Flasche
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.)
Robert Bosch Fernsehanlagen GmbH
Original Assignee
Fernseh GmbH
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Filing date
Publication date
Application filed by Fernseh GmbH filed Critical Fernseh GmbH
Application granted granted Critical
Publication of US3675062A publication Critical patent/US3675062A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange
    • 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
    • H01J29/92—Means forming part of the tube for the purpose of providing electrical connection to it

Definitions

  • the invention relates to a method and apparatus for making a current connection to a wall electrode at the front plate of television camera tubes, in particular vidicon and plumbicon tubes.
  • wall electrodes are, for example, in the nature of photo-cathodes or transparent conducting layers deposited from vapor, and serve as signal electrodes for picking up the picture signal from a target of photo-semiconductive material.
  • Nesa layer consists of transparent tin oxide, which is produced from a strongly corrosive tin chloride solution by spraying-on and then heating the substrate up to almost 500 C. If this Nesa layer is produced after the fusing-in of the contact, then the strongly corrosive tin chloride solution causes corrosion of the fused-in wire, as a result of which the quality of the contact between the Nesa layer and the wire is very unfavorably influenced.
  • the corrosive solution can creep into the interspace between the glass and the fused pin and can convert the surface of the wire into oxide or chloride. Even if the fused-in metal is a noble metal, the contact between the wire and the conducting layer is still uncertain. Moreover, those fused-in connections are expensive and are not vacuum-tight if there is not adequate matching to the type of glass used for the front plate.
  • the method of the present invention overcomes these disadvantages and allows fused-in connections to be achieved in a very simple manner, which exhibits a good contact with the conducting layer.
  • the method of making current connections to conducting layers at the front plate of semiconducting tubes, in particular Nesa layers consists in providing a bore in a polished and fault-free front plate, conically countersinking and polishing the bore at the openings, producing the Nesa layer, in a manner known per se, at that surface of the front plate facing the interior of the tube and, after the completion of this operation, pressing a plug of a plastic metal, preferably indium, into the bore.
  • the advantage of this method is that a good quality contact is thereby achieved between the Nesa layer and the leadthrough, which also is capable of withstanding thermal loading and makes a good vacuum seal. If indium is used as the metal for the plug, then it is advisable to strip the indium plug of its oxide skin by etching before performing the pressing-in operation. In this case a very intimate contact is established with the glass by the pressing operation.
  • the front plate thus provided with the front contact, can now be provided with a photo-conductive layer and can be connected with the tube.
  • the Nesa layer is interrupted at the outline of the portion provided for the scanning, so that for scanning and signal production the signal electrode alone is the determining factor in the size of the scanned raster. In this way a target capacitance is achieved which is reduced to one-third or one-quarter of that with a tube not provided with a lead-through at the front plate. This reduction in capacitance has a very advantageous influence upon the signal-to-noise ratio of the generated signal.
  • FIG. 1 shows the front plate in cross-section.
  • FIG. 2 shows a part of the front plate with a fused-in contact.
  • FIG. 3 shows a plan view of the front plate.
  • FIG. 4 shows an alternative form of contact to the conductive layer.
  • a television camera tube preferably of vidicon or plumbicon type, has a front plate 1, which is provided with a conductive layer L and a photosensitive layer P.
  • a so-called Nesa layer serves as the conductive layer.
  • a contact K is provided at the edge of the photo layer P. According to this method of the invention, reference being made to FIGS. 2 and 3, the making of this contact is effected in the manner described as below.
  • the front plate 1 (referring to the enlarged representation of FIG. 2) is provided with a bore 2 of a diameter between 1 and 2 mm.
  • This bore is situated close to the edge of that part of the target provided for scanning. Bevelled countersinks 3 are provided in this bore for the subsequent anchorage of the leadthrough.
  • the internal surface of the bore 2 is polished so that it presents a good base for the Nesa layer to be deposited thereon.
  • a coating of tin oxide is provided not only for that side of the front plate which is directed towards the interior of the tube but also the major part of the bore.
  • the arrangement of the lead-through contact in the front plate with respect of that part of the Nesa layer used for signal production can be seen from FIG. 3.
  • the front plate has introduced therein a contact 8 produced in the above described manner.
  • the Nesa layer is interrupted by an insulating margin 10, which can be produced by a chemical method or by the use of a grinding pencil.
  • the remaining portion of the Nesa layer 11 can be connected withthe sealing ring 11a of the indium metal for the purpose of controllingthe potential, the sealing ring serving to connect the front plate to the envelope of the tube. It is appropriate to provide this sealing ring with an external contact 12 in order to be able to control the potential of the Nesa portion 1 1.
  • a plug 12 of soft glass melting at a lower temperature than the front plate glass is inserted into the hole 2 by partly melting the plug. This insertion takes place after the preparation of the Nesa layer 4. Thereupon the contact with the interior Nesa layer is easily performed by painting the external part of the Nesa layer with silver paint so that a contact face 13 is formed. If necessary the volatile components of the silver paint can be evaporated by heating the front plate 1.
  • a method of making an electrical contact with a conductive layer mounted on a non-conductive substrate comprising the steps of A. boring a hole through the substrate,
  • said substrate is a glass plate in the front of a television camera tube and said conductive layer is a Nesa layer.
  • an improved means for making contact with the conductive layer comprising:
  • said plug is of indium and said contact means comprises a tack-formed device for piercing the indium plug.

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Laminated Bodies (AREA)
  • Devices For Supply Of Signal Current (AREA)
US25192A 1966-02-11 1970-04-02 Method and apparatus for connecting to a nesa layer Expired - Lifetime US3675062A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEST24984A DE1257875B (de) 1966-02-11 1966-02-11 Fernsprechnebenstellenanlage, insbesondere fuer Hotelbetrieb oder Krankenhaeuser, bei der im Besetztfall ein Wartevorgang einleitbar ist
DE19691917674 DE1917674B1 (de) 1966-02-11 1969-04-05 Verfahren zur Herstellung eines Kontaktes mit einer transparenten leitfaehigen Schicht im Innern einer Vakuumroehre,vorzugsweise einer Fernsehaufnahmeroehre

Publications (1)

Publication Number Publication Date
US3675062A true US3675062A (en) 1972-07-04

Family

ID=25757248

Family Applications (1)

Application Number Title Priority Date Filing Date
US25192A Expired - Lifetime US3675062A (en) 1966-02-11 1970-04-02 Method and apparatus for connecting to a nesa layer

Country Status (4)

Country Link
US (1) US3675062A (enrdf_load_stackoverflow)
BE (1) BE699245A (enrdf_load_stackoverflow)
DE (2) DE1257875B (enrdf_load_stackoverflow)
GB (2) GB1171833A (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3772552A (en) * 1970-09-16 1973-11-13 Sony Corp Image pickup tube
US3854069A (en) * 1971-11-27 1974-12-10 Sony Corp Method of making an electrical contact for a color pickup tube
US3857037A (en) * 1971-09-29 1974-12-24 Matsushita Electric Ind Co Ltd Color camera tube having color strip filter and an index electrode
USB328391I5 (enrdf_load_stackoverflow) * 1972-01-31 1975-01-28
US3865970A (en) * 1971-12-07 1975-02-11 Philips Corp Vacuum-tight electric leadthrough in an electric discharge tube
US3912851A (en) * 1973-05-23 1975-10-14 Philips Corp Electric discharge tube and method of manufacturing same
DE2522971A1 (de) * 1974-05-23 1975-12-04 Sony Corp Elektrodenanordnung
US3924792A (en) * 1971-12-07 1975-12-09 Philips Corp Method of manufacturing a vacuum-tight electric leadthrough in an electric discharge tube
JPS5274223A (en) * 1975-12-17 1977-06-22 Hitachi Ltd Pick up tube
US4278912A (en) * 1978-06-24 1981-07-14 U.S. Philips Corporation Electric discharge tube having a glass-sealed electric leadthrough and method of manufacturing such an electric leadthrough
US4356530A (en) * 1979-12-15 1982-10-26 Tdk Electronics Co., Ltd. Ceramic capacitor
US6030895A (en) * 1995-01-03 2000-02-29 International Business Machines Corporation Method of making a soft metal conductor
US20120045918A1 (en) * 2009-04-23 2012-02-23 Pierre-Yves Litzler Subcutaneous device for electrical percutaneous connection
US8639353B2 (en) 2009-04-23 2014-01-28 Centre Hospitalier Universitaire De Rouen Electrical connection device implantable in the human body

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040124A (en) * 1956-06-25 1962-06-19 Armour Res Found Transducer head system
US3522576A (en) * 1968-04-26 1970-08-04 James L Cairns Underwater electrical connector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040124A (en) * 1956-06-25 1962-06-19 Armour Res Found Transducer head system
US3522576A (en) * 1968-04-26 1970-08-04 James L Cairns Underwater electrical connector

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3772552A (en) * 1970-09-16 1973-11-13 Sony Corp Image pickup tube
US3857037A (en) * 1971-09-29 1974-12-24 Matsushita Electric Ind Co Ltd Color camera tube having color strip filter and an index electrode
US3854069A (en) * 1971-11-27 1974-12-10 Sony Corp Method of making an electrical contact for a color pickup tube
US3865970A (en) * 1971-12-07 1975-02-11 Philips Corp Vacuum-tight electric leadthrough in an electric discharge tube
US3924792A (en) * 1971-12-07 1975-12-09 Philips Corp Method of manufacturing a vacuum-tight electric leadthrough in an electric discharge tube
US4039888A (en) * 1972-01-31 1977-08-02 Hitachi, Ltd. Image pick-up tube having a plurality of electrodes on the face-plate
USB328391I5 (enrdf_load_stackoverflow) * 1972-01-31 1975-01-28
US3912851A (en) * 1973-05-23 1975-10-14 Philips Corp Electric discharge tube and method of manufacturing same
DE2522971A1 (de) * 1974-05-23 1975-12-04 Sony Corp Elektrodenanordnung
JPS5274223A (en) * 1975-12-17 1977-06-22 Hitachi Ltd Pick up tube
US4278912A (en) * 1978-06-24 1981-07-14 U.S. Philips Corporation Electric discharge tube having a glass-sealed electric leadthrough and method of manufacturing such an electric leadthrough
US4356530A (en) * 1979-12-15 1982-10-26 Tdk Electronics Co., Ltd. Ceramic capacitor
US6030895A (en) * 1995-01-03 2000-02-29 International Business Machines Corporation Method of making a soft metal conductor
US20120045918A1 (en) * 2009-04-23 2012-02-23 Pierre-Yves Litzler Subcutaneous device for electrical percutaneous connection
US8545255B2 (en) * 2009-04-23 2013-10-01 Centre Hospitalier Universitaire De Rouen Subcutaneous device for electrical percutaneous connection
US8639353B2 (en) 2009-04-23 2014-01-28 Centre Hospitalier Universitaire De Rouen Electrical connection device implantable in the human body

Also Published As

Publication number Publication date
GB1171833A (en) 1969-11-26
DE1257875B (de) 1968-01-04
GB1257875A (enrdf_load_stackoverflow) 1971-12-22
DE1917674B1 (de) 1970-09-10
BE699245A (enrdf_load_stackoverflow) 1967-11-30

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