US2485593A - Rectifier and method of making the same - Google Patents

Rectifier and method of making the same Download PDF

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Publication number
US2485593A
US2485593A US720035A US72003547A US2485593A US 2485593 A US2485593 A US 2485593A US 720035 A US720035 A US 720035A US 72003547 A US72003547 A US 72003547A US 2485593 A US2485593 A US 2485593A
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United States
Prior art keywords
base plate
selenium
rectifier
opening
layer
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Expired - Lifetime
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US720035A
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Leslie B Haigh
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STC PLC
Federal Telephone and Radio Corp
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Standard Telephone and Cables PLC
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Publication date
Priority claimed from US498654A external-priority patent/US2419602A/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US720035A priority Critical patent/US2485593A/en
Application granted granted Critical
Publication of US2485593A publication Critical patent/US2485593A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

  • An object of this invention is directed to the provision of improved, small, low-capacity rectifiers.
  • Another object of this invention is to provide a small rectifier of simple design and high efiiciency.
  • a further object of this invention is directed toward an improved and simplified method of making rectifiers.
  • Fig. 1 is a longitudinal cross-sectional view of a preferred form of rectifier construction in accordance with the present invention
  • Fig. 2 is a top plan view of the rectifier illustrated in Fig. 1;
  • Fig. 3 is a horizontal cross-sectional view taken along the line 3-3 of Fig. 1.
  • the rectifier is built-up on a metal base plate 40 having a raised portion i2, preferably substantially centrally located with respect to the plate as a whole, upon which is formed in any suitable manner known to the art, a thin selenium layer M.
  • a layer of insulation l6, which may be a thermoplastic artificial insulation such as polystyrene or may be formed of insulating paper is placed on the base It! and is provided with a through opening uncovering the selenium spot it.
  • a lead wire 18 is placed on the insulating layer 16, passing over the opening therethrough and a second layer of insulation 20 is applied over the lead wire l8 and joining with the first insulating layer It.
  • the second insulating layer is also provided with a through opening substantially aligned with the opening in the insulating layer i6.
  • Counter-electrode alloy 22 is then melted and poured through the aligned openings forming contact with the selenium layer It and, at the same time fusing with a portion of the lead wire 18 and thus holding the latter in position.
  • the base plate is preferably formed with four ears 24 at its corners and these are bent upwardly and over 2 the top insulating layer 20 pressing the parts against the base plate III to form a unitary structure.
  • a second lead wire 26 may be soldered-or otherwise attached to the base plate I0.
  • the integral legs formed on the base plate are shown to extend longitudinally thereof, it will be obvious to those skilled in this art that these built-up and turned-over legs could project laterally from the base plate as well.
  • the base plate It will preferably consist of a metal containing iron but other metals suitable for use with selenium for the purposes of rectification may be used, or the base plate l0 may be formed of any metal coated with an iron-containing alloy.
  • the rectifier may be electroformed in the usual manner to create the desired barrier said wire passing over said opening, a second layer of insulation above said lead wire and having an opening therethrough substantially coaxial with the opening in the first insulating layer, a counter-electrode alloy extending through said two openings, about said lead wire and to said selenium layer, and integral extensions on said base plate bent upwardly and over the second insulating layer to hold all the parts together as an integral unit.
  • a rectifier comprising, in combination, a metallic base plate, a layer of selenium on said base plate, an insulating layer supported by said base plate and having a small opening therethrough exposing a small area of selenium, alead wire on said insulating layer passing across said opening, counter-electrode alloy in said opening, fused to said lead wire and contacting the selenium layer, a second insulating layer over said lead wire and the first insulating layer, and integral extensoins on said base plate bent upwardly and over the second insulating layer to hold all the parts together as an integral unit.
  • said selenium layer comprises a small spot of selenium on the base plate, corresponding in size to the size of the opening in the first insulating layer.
  • a rectifier comprising, in combination, a metallic base plate having a raised substantially central portion, a layer of selenium on said raised portion, a first insulating layer on said base plate,
  • a rectifier comprising, in combination a metallic base plate, a layer of insulating material covering the major portion of the top surface area of said base plate, said layer having an opening extending thereth'rough, a spot of selenium covering only that portion of said base plate top surface that is bounded by said opening, a lead wire supported on said insulation and passing over said opening, a second layer of insulation above said lead wire and having an opening above said firstnamed opening, and a counter-electrode element extending through said openings into contact with said lead wire and selenium spot.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Ceramic Engineering (AREA)
  • Rectifiers (AREA)

Description

Oct. 25, 1949. I 1.. B. HAIGH 2,485, 3
RECTIFIER AND METHOD OF MAKING THE SAIE Origin]. Fil'ed Aug, 14, 1943 IN VEN TOR 155A IE 5. 114 6 Patented Oct. 25, 1949 Q RECTIFIER AND METHOD OF MAKING THE SAME Leslie B. Haigh, West Orange, N. J., as'signor to Federal Telephone and Radio Corporation, Newark, N. J a corporation of Delaware Original application August 14, 1943, Serial No. 498,654. Divided and this application January 3, 1947, Serial No. 720,035 1 6 Claims. (CL 175-366) This invention relates to improvements in rectifiers and methods of making the same. and more particularly to rectifiers of the dry contact type, such as selenium rectifiers.
This application is a division of application, Serial No. 498,654, filed August 14, 1943, now Patent No. 2,419,602, issued April 29, 1947.
An object of this invention is directed to the provision of improved, small, low-capacity rectifiers.
Another object of this invention is to provide a small rectifier of simple design and high efiiciency.
A further object of this invention is directed toward an improved and simplified method of making rectifiers.
Generally speaking, this invention may be defined as comprising the constructions and combinations recited in the annexed claims and illustrated in the drawings accompanying and forming a part of this application, wherein:
Fig. 1 is a longitudinal cross-sectional view of a preferred form of rectifier construction in accordance with the present invention;
Fig. 2 is a top plan view of the rectifier illustrated in Fig. 1; and
Fig. 3 is a horizontal cross-sectional view taken along the line 3-3 of Fig. 1.
In the form of invention shown in Figs. 1, 2
v and 3, it will be seen that the rectifier is built-up on a metal base plate 40 having a raised portion i2, preferably substantially centrally located with respect to the plate as a whole, upon which is formed in any suitable manner known to the art, a thin selenium layer M. A layer of insulation l6, which may be a thermoplastic artificial insulation such as polystyrene or may be formed of insulating paper is placed on the base It! and is provided with a through opening uncovering the selenium spot it. A lead wire 18 is placed on the insulating layer 16, passing over the opening therethrough and a second layer of insulation 20 is applied over the lead wire l8 and joining with the first insulating layer It. The second insulating layer is also provided with a through opening substantially aligned with the opening in the insulating layer i6. Counter-electrode alloy 22 is then melted and poured through the aligned openings forming contact with the selenium layer It and, at the same time fusing with a portion of the lead wire 18 and thus holding the latter in position. In accordance with the construction of the described modification, the base plate is preferably formed with four ears 24 at its corners and these are bent upwardly and over 2 the top insulating layer 20 pressing the parts against the base plate III to form a unitary structure. A second lead wire 26 may be soldered-or otherwise attached to the base plate I0.
It will be seen from the description just given that the described construction provides a very simple and yet extremely emcient low capacity rectifier. The selenium spot and the counterelectrode area in contact therewith are kept small, thus providing for high current density and improved efiiciency of the rectifier. In the drawings, the thickness of the parts such as the metal plate It, selenium layer I4 and the insulatinglayers 16 and 20 have been exaggerated for the purposes of clear illustration, and while the invention is not intended to be limited to any particular size, it may be mentioned that rectifiers of the type described have been manufactured with a length of about of an inch, a
width of about A of an inch and a thickness of less than of an inch. Additionally, while the integral legs formed on the base plate are shown to extend longitudinally thereof, it will be obvious to those skilled in this art that these built-up and turned-over legs could project laterally from the base plate as well. After assembly of the exposed portions of the rectifier, including the base plate, the turned-over legs, the counter-electrode alloy and parts of the lead wires can be further insulated as by painting, if desired.
Various changes and modifications coming within the scope of the present invention will occur to those skilled in this art. The base plate It will preferably consist of a metal containing iron but other metals suitable for use with selenium for the purposes of rectification may be used, or the base plate l0 may be formed of any metal coated with an iron-containing alloy. The manner in which the selenium is applied to the base plate is of no particular importance with respect to the present invention and variousmethods' known to the art may be utilized, while after assembly, the rectifier may be electroformed in the usual manner to create the desired barrier said wire passing over said opening, a second layer of insulation above said lead wire and having an opening therethrough substantially coaxial with the opening in the first insulating layer, a counter-electrode alloy extending through said two openings, about said lead wire and to said selenium layer, and integral extensions on said base plate bent upwardly and over the second insulating layer to hold all the parts together as an integral unit.
2. A rectifier comprising, in combination, a metallic base plate, a layer of selenium on said base plate, an insulating layer supported by said base plate and having a small opening therethrough exposing a small area of selenium, alead wire on said insulating layer passing across said opening, counter-electrode alloy in said opening, fused to said lead wire and contacting the selenium layer, a second insulating layer over said lead wire and the first insulating layer, and integral extensoins on said base plate bent upwardly and over the second insulating layer to hold all the parts together as an integral unit.
3. The combination according to claim 2, in which said second insulating layer has an opemng therethrough substantially aligned with the opening in the first insulating layer, and in which I said alloy extends through both openings to the selenium layer.
4. The combination according to claim 2, in which said selenium layer comprises a small spot of selenium on the base plate, corresponding in size to the size of the opening in the first insulating layer.
5. A rectifier comprising, in combination, a metallic base plate having a raised substantially central portion, a layer of selenium on said raised portion, a first insulating layer on said base plate,
having an'opening exposing said selenium layer, a lead wire on said insulating layer having a portion extending over said opening, a second layer of insulation on said first insulation, covering said lead wire and having an opening aligned with the opening in the first insulating layer, counterelectrode alloy in said openings, fused to the lead wire and contacting the selenium layer, and integral extensions on said base plate bent upwardly and over said second insulating layer to hold said parts together.
6. A rectifier comprising, in combination a metallic base plate, a layer of insulating material covering the major portion of the top surface area of said base plate, said layer having an opening extending thereth'rough, a spot of selenium covering only that portion of said base plate top surface that is bounded by said opening, a lead wire supported on said insulation and passing over said opening, a second layer of insulation above said lead wire and having an opening above said firstnamed opening, and a counter-electrode element extending through said openings into contact with said lead wire and selenium spot.
LESLIE B. HAIGH.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Great Britain Nov. 28,1935
US720035A 1943-08-14 1947-01-03 Rectifier and method of making the same Expired - Lifetime US2485593A (en)

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Application Number Priority Date Filing Date Title
US498654A US2419602A (en) 1943-08-14 1943-08-14 Rectifier and method of making the same
US720035A US2485593A (en) 1943-08-14 1947-01-03 Rectifier and method of making the same

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745044A (en) * 1951-09-15 1956-05-08 Gen Electric Asymmetrically conductive apparatus
DE950491C (en) * 1951-09-15 1956-10-11 Gen Electric Rectifier element

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB439064A (en) * 1933-07-25 1935-11-28 Saint Gobain Improvements relating to electric condensers
US2261618A (en) * 1939-01-23 1941-11-04 Rca Corp Blocking-layer electrode system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB439064A (en) * 1933-07-25 1935-11-28 Saint Gobain Improvements relating to electric condensers
US2261618A (en) * 1939-01-23 1941-11-04 Rca Corp Blocking-layer electrode system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745044A (en) * 1951-09-15 1956-05-08 Gen Electric Asymmetrically conductive apparatus
DE950491C (en) * 1951-09-15 1956-10-11 Gen Electric Rectifier element

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