US2296575A - Manufacture of alternating current rectifiers - Google Patents

Manufacture of alternating current rectifiers Download PDF

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Publication number
US2296575A
US2296575A US435112A US43511242A US2296575A US 2296575 A US2296575 A US 2296575A US 435112 A US435112 A US 435112A US 43511242 A US43511242 A US 43511242A US 2296575 A US2296575 A US 2296575A
Authority
US
United States
Prior art keywords
manufacture
rectifying
alternating current
layer
current rectifiers
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
US435112A
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English (en)
Inventor
Rowley Cyril Arthur
Jenkins Alexander
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.)
Hitachi Rail STS USA Inc
Original Assignee
Union Switch and Signal 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
Application filed by Union Switch and Signal Inc filed Critical Union Switch and Signal Inc
Application granted granted Critical
Publication of US2296575A publication Critical patent/US2296575A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D99/00—Subject matter not provided for in other groups of this subclass
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D48/00—Individual devices not covered by groups H10D1/00 - H10D44/00
    • H10D48/01—Manufacture or treatment
    • H10D48/04—Manufacture or treatment of devices having bodies comprising selenium or tellurium in uncombined form
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
    • H10D62/10—Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies

Definitions

  • This invention relates to the manufacture of alternating current rectifiers more particularly of the type comprising a sheet metal base or support provided with a layer of rectifying materialsuch as selenium to which a conducting metallic layer is applied.
  • the invention is more particularly applicable to rectifiers produced by the process of the general character described in the specification of United States Patent No. 2,235,051 in which sheet metal is coated with selenium material the surface of which is then covered with a conducting layer of metal applied by spraying or otherwise, the composite sheet thus formed being subse quently subdivided into rectifying elements of the desired size and shape by a punching or stamping operation.
  • the composite sheet comprising the sheet metal base with its applied coatings of rectifying and conducting material is subdivided into individual elements by punching or stamping without the use ofa mask or its equivalent and the metallic coating is then removed adjacent to the edge or edges of each element by a" cutting or grinding operation.
  • the cutting or grinding tool is so adjusted that a chamfering action is efiected, the finished edge or edges of the element being thus slightly bevelled.
  • the punching or stamping of the composite sheet is so effected that the burr or raised rim necessarily produced at the cut edge is on that side of the sheet to which the rectifying and conducting coatings are applied so that the removal of this burr or rim by the action of the cutting or grinding tool removes the metallic coating over a narrow zone adjacent to the edge of the element.
  • the rectifier disc comprises a sheet metal base i coated with a layer 2 of selenium material on which a metallic conducting coating 3 is superposed. Owing to the effect of the punching operation by which the disc is produced the coating 3 is, at the cut edges, burred over as indicated at 4 so as to be brought into electrical contact with the metal base I.
  • the cute edges of the disc and of the centralaperture therein are cut or ground away as indicated in dotted lines at 5 so that in the completed disc these edges are chamfered or bevelled as shown in Figure 2.
  • the invention evidently eliminates the necessity for very accurate tool clearances to be maintained as regards the punching or stamping tools employed whileelfectively preventing the risk of short circuit between the nietal base and the conducting coating of the individual rectifying elements produced.
  • a process for the manufacture of alternating current rectifiers of the kind described which consists in applying a layer of rectifying material to a. sheet metal base of sufiicient size to provide a plurality of rectifying elements, applying a conducting layer to the entire surface of the rectifying layer, subdividing the base with its applied coatings into rectifying elements by a punching or stamping operation, and then removing the metallic conducting layer adjacent to the edge or edges of each element by a cutting or grinding operation.
  • a process for the manufacture of alternating current rectifiers of the kind described which consists in applying a layer of rectifying material to a sheet metal base of sufficient size to provide a plurality of rectifying elements. applying a conducting layer to the entire surface of the rectifying layer, subdividing the base with its applied coatings into rectifying elements by a punching or stamping operation, and then removing the metallic conducting layer adjacent to the edge oredges of each element by a cutting or grinding tool 50 adjusted that a chamfering action is effected for the purpose specified.
  • a process for the manufacture of alternating current rectifiers of the kind described which consists in applying a layer of rectifying material to a sheet metal base of sufficient size to provide a plurality of rectifying elements, applying 'a conducting layer to the entire surface of the rectifying layer, subdividing the base with its applied coatings into circular rectifying elements having a central aperture by a punching or stamping operation in such manner that the burrs or raised rims produced at the cut edges are on that side of the base to which the coatings are applied, and then simultaneously removing the burr at the outer edge of the element and the burr at the edge of the aperture by a cutting or grinding operation.

Landscapes

  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
US435112A 1940-10-24 1942-03-17 Manufacture of alternating current rectifiers Expired - Lifetime US2296575A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB15630/40A GB544743A (en) 1940-10-24 1940-10-24 Improvements relating to the manufacture of alternating current dry rectifiers

Publications (1)

Publication Number Publication Date
US2296575A true US2296575A (en) 1942-09-22

Family

ID=10062604

Family Applications (1)

Application Number Title Priority Date Filing Date
US435112A Expired - Lifetime US2296575A (en) 1940-10-24 1942-03-17 Manufacture of alternating current rectifiers

Country Status (3)

Country Link
US (1) US2296575A (enrdf_load_stackoverflow)
GB (1) GB544743A (enrdf_load_stackoverflow)
NL (1) NL84010C (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2450020A (en) * 1942-12-03 1948-09-28 Int Standard Electric Corp Manufacture of rectifier disks
US2543678A (en) * 1948-10-13 1951-02-27 Radio Receptor Co Inc Method of producing rectifier elements
US2667722A (en) * 1950-09-18 1954-02-02 Westinghouse Brake & Signal Mold for use in the manufacture of dry rectifiers
US2743506A (en) * 1952-02-23 1956-05-01 Int Resistance Co Method of manufacturing rectifier cells
US3482303A (en) * 1966-11-07 1969-12-09 Texas Instruments Inc Method of manufacturing a solderclad metal composite
US3772770A (en) * 1970-10-02 1973-11-20 Licentia Gmbh Method of manufacturing a semiconductor device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2450020A (en) * 1942-12-03 1948-09-28 Int Standard Electric Corp Manufacture of rectifier disks
US2543678A (en) * 1948-10-13 1951-02-27 Radio Receptor Co Inc Method of producing rectifier elements
US2667722A (en) * 1950-09-18 1954-02-02 Westinghouse Brake & Signal Mold for use in the manufacture of dry rectifiers
US2743506A (en) * 1952-02-23 1956-05-01 Int Resistance Co Method of manufacturing rectifier cells
US3482303A (en) * 1966-11-07 1969-12-09 Texas Instruments Inc Method of manufacturing a solderclad metal composite
US3772770A (en) * 1970-10-02 1973-11-20 Licentia Gmbh Method of manufacturing a semiconductor device

Also Published As

Publication number Publication date
NL84010C (enrdf_load_stackoverflow)
GB544743A (en) 1942-04-27

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