GB1331814A - Controlling the production of plate electrodes such as shadow masks for colour television tubes - Google Patents

Controlling the production of plate electrodes such as shadow masks for colour television tubes

Info

Publication number
GB1331814A
GB1331814A GB2000371A GB2000371A GB1331814A GB 1331814 A GB1331814 A GB 1331814A GB 2000371 A GB2000371 A GB 2000371A GB 2000371 A GB2000371 A GB 2000371A GB 1331814 A GB1331814 A GB 1331814A
Authority
GB
United Kingdom
Prior art keywords
mask
shadow masks
controlling
production
apertures
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
Application number
GB2000371A
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.)
Zenith Electronics LLC
Original Assignee
Zenith Radio 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 Zenith Radio Corp filed Critical Zenith Radio Corp
Publication of GB1331814A publication Critical patent/GB1331814A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • ing And Chemical Polishing (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

1331814 Making shadow masks ZENITH RADIO CORP 19 April 1971 [28 Jan 1970] 20003/71 Heading B3A [Also in Divisions B6 and G1] A shadow mask for a television colour tube is etched in two stages, the first stage comprising forming or enlarging apertures in the mask to less than a predetermined size and the second stage comprising enlarging the apertures to the predetermined size. Between the two stages the size of the apertures is sensed by measuring the transmissivity of the mask to impinging radiation (e.g. light) and the period of etching in the second stage is regulated as a result of this measurement. The mask may be of steel and the etchant ferric chloride.
GB2000371A 1970-01-28 1971-04-19 Controlling the production of plate electrodes such as shadow masks for colour television tubes Expired GB1331814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US661970A 1970-01-28 1970-01-28

Publications (1)

Publication Number Publication Date
GB1331814A true GB1331814A (en) 1973-09-26

Family

ID=21721771

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2000371A Expired GB1331814A (en) 1970-01-28 1971-04-19 Controlling the production of plate electrodes such as shadow masks for colour television tubes

Country Status (4)

Country Link
US (1) US3669771A (en)
DE (1) DE2100612C3 (en)
GB (1) GB1331814A (en)
NL (1) NL7018858A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973965A (en) * 1972-05-30 1976-08-10 Tokyo Shibaura Electric Co., Ltd. Making shadow mask with slit-shaped apertures for CRT
US3909311A (en) * 1974-08-05 1975-09-30 Hitachi Ltd Shadow mask for use in color picture tube and method for fabricating same
US4050821A (en) * 1976-09-27 1977-09-27 Bell Telephone Laboratories, Incorporated Linewidth measurement method and apparatus
DE2815373A1 (en) * 1978-04-10 1979-10-11 Siemens Ag METHOD AND DEVICE FOR TESTING HIGH-PRECISION FORMAT PARTS
DE3049595A1 (en) * 1980-12-31 1982-07-08 Albert-Frankenthal Ag, 6710 Frankenthal TAPE LINE FOR TRANSPORTING AND SLOWING DOWN FOLDED PRODUCTS
US5387313A (en) * 1992-11-09 1995-02-07 Bmc Industries, Inc. Etchant control system

Also Published As

Publication number Publication date
NL7018858A (en) 1971-07-30
DE2100612B2 (en) 1973-06-20
DE2100612C3 (en) 1974-01-10
DE2100612A1 (en) 1972-01-27
US3669771A (en) 1972-06-13

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees