FR2360686A1 - Etching shadow masks e.g. for colour television or other tubes - using magnetic sensor to ensure accurate hole size - Google Patents

Etching shadow masks e.g. for colour television or other tubes - using magnetic sensor to ensure accurate hole size

Info

Publication number
FR2360686A1
FR2360686A1 FR7723031A FR7723031A FR2360686A1 FR 2360686 A1 FR2360686 A1 FR 2360686A1 FR 7723031 A FR7723031 A FR 7723031A FR 7723031 A FR7723031 A FR 7723031A FR 2360686 A1 FR2360686 A1 FR 2360686A1
Authority
FR
France
Prior art keywords
magnetic sensor
etching
sheet
tubes
hole size
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.)
Withdrawn
Application number
FR7723031A
Other languages
French (fr)
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.)
RCA Corp
Original Assignee
RCA 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 RCA Corp filed Critical RCA Corp
Publication of FR2360686A1 publication Critical patent/FR2360686A1/en
Withdrawn legal-status Critical Current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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/02—Local etching

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • ing And Chemical Polishing (AREA)

Abstract

Openings are etched in a moving metal. sheet made of magnetically permeable material. The sheet is imersed in an etchant, and a magnetic sensor near the sheet measures the magnetic field penetrating the holes formed in the sheet. The magnetic field measurement is used to control the etching. Etching is pref. controlled by varying the etching time, or altering the concn. of the etchant flowing over the sheet.
FR7723031A 1976-08-02 1977-07-27 Etching shadow masks e.g. for colour television or other tubes - using magnetic sensor to ensure accurate hole size Withdrawn FR2360686A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US71074376A 1976-08-02 1976-08-02

Publications (1)

Publication Number Publication Date
FR2360686A1 true FR2360686A1 (en) 1978-03-03

Family

ID=24855337

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7723031A Withdrawn FR2360686A1 (en) 1976-08-02 1977-07-27 Etching shadow masks e.g. for colour television or other tubes - using magnetic sensor to ensure accurate hole size

Country Status (4)

Country Link
JP (1) JPS5318441A (en)
DE (1) DE2734842C3 (en)
FR (1) FR2360686A1 (en)
IT (1) IT1077420B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2360984A1 (en) * 1976-08-02 1978-03-03 Rca Corp METHOD FOR MANUFACTURING A SCREEN STRUCTURE OF A CATHODIC RAY TUBE
EP0422525A2 (en) * 1989-10-07 1991-04-17 Kabushiki Kaisha Toshiba Exposing method and apparatus
US5288729A (en) * 1989-10-07 1994-02-22 Kabushiki Kaisha Toshiba Exposing method and apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61199039A (en) * 1985-02-28 1986-09-03 Sumitomo Electric Ind Ltd Method for patenting high carbon steel wire rod of small diameter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666579A (en) * 1970-06-15 1972-05-30 Zenith Radio Corp Etching electrodes
US3702277A (en) * 1970-09-23 1972-11-07 Zenith Radio Corp Control system for mask etching apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666579A (en) * 1970-06-15 1972-05-30 Zenith Radio Corp Etching electrodes
US3702277A (en) * 1970-09-23 1972-11-07 Zenith Radio Corp Control system for mask etching apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2360984A1 (en) * 1976-08-02 1978-03-03 Rca Corp METHOD FOR MANUFACTURING A SCREEN STRUCTURE OF A CATHODIC RAY TUBE
EP0422525A2 (en) * 1989-10-07 1991-04-17 Kabushiki Kaisha Toshiba Exposing method and apparatus
EP0422525A3 (en) * 1989-10-07 1991-11-13 Kabushiki Kaisha Toshiba Exposing method and apparatus
US5288729A (en) * 1989-10-07 1994-02-22 Kabushiki Kaisha Toshiba Exposing method and apparatus

Also Published As

Publication number Publication date
JPS5318441A (en) 1978-02-20
DE2734842C3 (en) 1979-11-15
DE2734842B2 (en) 1979-03-29
DE2734842A1 (en) 1978-02-09
JPS5440450B2 (en) 1979-12-04
IT1077420B (en) 1985-05-04

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Legal Events

Date Code Title Description
ST Notification of lapse