GB994440A - Improvements in or relating to metal film resistors - Google Patents

Improvements in or relating to metal film resistors

Info

Publication number
GB994440A
GB994440A GB4278261A GB4278261A GB994440A GB 994440 A GB994440 A GB 994440A GB 4278261 A GB4278261 A GB 4278261A GB 4278261 A GB4278261 A GB 4278261A GB 994440 A GB994440 A GB 994440A
Authority
GB
United Kingdom
Prior art keywords
film
metal
resistor
tantalum
anodization
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
GB4278261A
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.)
AT&T Corp
Original Assignee
Western Electric Co 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.)
Filing date
Publication date
Priority claimed from US845754A external-priority patent/US3148129A/en
Priority claimed from US74691A external-priority patent/US3159556A/en
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB994440A publication Critical patent/GB994440A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/22—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming
    • H01C17/26—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming by converting resistive material

Abstract

<PICT:0994440/C6-C7/1> A resistor is made by depositing a thin film of a metal on to an insulating substrate, by anodizing the film while monitoring its resistance, terminating the anodization when the cross-sectional area of the remaining metal has fallen enough to increase the resistance to its desired value, and by thermally ageing the resistor without removing the anodically formed oxide film. The metal used may be tantalum, titanium, zirconium, aluminium, or niobium. The electrolyte may be a dilute aqueous solution of nitric, boric, acetic, oxalic, or citric acid. The maximum potential used should not exceed 400 volts. As shown in Fig. 2, the metal film 13 may be deposited over previously applied gold, silver, or copper electrodes 12A, 12B, and the electrolyte may be contained within wax walls 14 built on strips of electroplater's tape (not shown) applied to the substrate. The ageing step subsequent to anodization is carried out by heating the resistor in air to a temperature of 200-400 DEG C. for a period of 2-10 hours. In the example given tantalum is oxidized with 5 weight per cent aqueous oxalic acid using a tantalum cathode, and the film and its oxide layer heated for 2 1/2 hours at 250 DEG C.
GB4278261A 1959-10-12 1961-11-29 Improvements in or relating to metal film resistors Expired GB994440A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US845754A US3148129A (en) 1959-10-12 1959-10-12 Metal film resistors
US74691A US3159556A (en) 1960-12-08 1960-12-08 Stabilized tantalum film resistors

Publications (1)

Publication Number Publication Date
GB994440A true GB994440A (en) 1965-06-10

Family

ID=32473920

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4278261A Expired GB994440A (en) 1959-10-12 1961-11-29 Improvements in or relating to metal film resistors

Country Status (1)

Country Link
GB (1) GB994440A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213986A (en) * 1987-12-16 1989-08-23 Philips Electronic Associated Fabrication of resistors in microwave and other circuits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213986A (en) * 1987-12-16 1989-08-23 Philips Electronic Associated Fabrication of resistors in microwave and other circuits

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