US2662984A - Crystal contact device - Google Patents

Crystal contact device Download PDF

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Publication number
US2662984A
US2662984A US140892A US14089250A US2662984A US 2662984 A US2662984 A US 2662984A US 140892 A US140892 A US 140892A US 14089250 A US14089250 A US 14089250A US 2662984 A US2662984 A US 2662984A
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United States
Prior art keywords
collar
cylinder
contact device
crystal
metallic
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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
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US140892A
Inventor
James Emrys Gwynne
Lindeil Aubrey Oscar Edgar
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General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to US140892A priority Critical patent/US2662984A/en
Application granted granted Critical
Publication of US2662984A publication Critical patent/US2662984A/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
    • H01L23/12—Mountings, e.g. non-detachable insulating substrates
    • H01L23/14—Mountings, e.g. non-detachable insulating substrates characterised by the material or its electrical properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/02—Containers; Seals
    • H01L23/10—Containers; Seals characterised by the material or arrangement of seals between parts, e.g. between cap and base of the container or between leads and walls of the container
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • 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

Definitions

  • the length of the collar 5 is chosen so that with the crystal element 9 and the metallic member l cooperating therewith of predetermined dimensions and fixed in a predetermined position relative to their supporting discs 2, bringing the two discs into contact with opposite ends of the collar is just suflicient to bring the contact point of the metallic member 4 into contact with the surface of the crystal element 3 at a suitable contact pressure, the metallic member having sufficient resilience to take up manufacturing tolerances in the various dimensions concerned.
  • the outer surface of the collar is next tinned with solder, and the assembly of the collar and disc is inserted into the cylinder until it is in a central position along the length of the cylinder.
  • This may conveniently be arranged by placing the cylinder in an upright position on a flat surface, inserting an annular ring in the cylinder, which annular ring will come to rest on the flat surface, and inserting the assembly into the cylinder until it comes to rest on the annular ring.
  • the assembly is easily positioned in a predetermined position.
  • the cylinder is then heated sufficiently to melt the solder on the collar, so that on cooling the collar is secured in the required position.
  • the reason for making the discs of slightly smaller diameter than the collar is to ensure that the discs do not bind on the side of the cylinder when inserting the assembly in the cylinder.
  • the collar serves the dual function of maintaining the discs at a predetermined distance apart and of reducing to a more desirable value the characteristic impedance of that portion of the device bounded by the collar, that is the portion between the two discs.
  • Figure 2 illustrates a slightly modified arrangement of the device which without departing from the scope of the present invention presents an alternative method of obtaining a good point contact between the crystal element and the co-opcrating metal member.
  • the metallic stud 6 associated with the metallic member 4 is concentrically bored throughout its length, the bore 9 being tinned and of a diameter sufficient to accommodate a metal rod in upon which the co-operating metal member is mounted to be passed therethrough and which after adjustment is secured in position by heating the device suificiently to allow the tinning to melt; any excessive projection of the metal rod 19 being severed after soldering.
  • the invention has been described with reference to a double-ended form of crystal contact device, it is to be understood that it is equally applicable to a single-ended crystal contact dedisc no longer being necessary in this case as the coaxial line is connected only to the other end of the cylinder.
  • the collar has been described as a separate member from the cylinder, the collar may in fact be provided integral with the cylinder by forming the cylinder with an intermediate portion of reduced internal diameter. The separate collar is preferred as the integral collar is more difficult to produce to the required degree of accuracy.
  • the collar may be of insulating material, provided that the inner surface at least is provided with a metallic coating which is efiectively electrically connected to the cylinder, at any rate at the radio frequencies concerned, so that the collar can still serve to reduce to a more desirable value the characteristic impedance of that portion of the device bounded by the collar.
  • a crystal contact device for use at a radio frequency, said device comprising a hollow metal cylinder, a collar whose inner surface is metallic, said collar being disposed wholly within the metal cylinder, the outer surface of said collar being in contact with the juxtaposed portion of the inner surface of the cylinder over the entire length of the collar, said inner surface of the collar being effectively electrically connected to the cylinder at said radio frequency, a crystalline element and associated supporting member, and a cooperating metal member and associated supporting member, said supporting members being of disc form and situated one against each end of the collar, said crystalline element, said cooperating metal member and said associated supporting members being disposed wholly within the metal cylinder, and said crystalline element and said cooperating metal member being disposed wholly within the collar.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Ceramic Engineering (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Description

E. G. JAMES ET AL CRYSTAL CONTACT DEVICE Filed Jan. 27, 1950 K W/WQ Dec. 15, 1953 In assembling the device the crystal element 3 and the metallic member i are each secured to the studs 9 on the appropriate discs 2, and each disc is then placed over one end of the collar 5 and secured to the collar by a suitable synthetic resin plastic. The interior of the collar in which the crystal element and the metallic member are now situated is arranged to be hermetically sealed by the plastic by which the discs are secured to the collar. The length of the collar 5 is chosen so that with the crystal element 9 and the metallic member l cooperating therewith of predetermined dimensions and fixed in a predetermined position relative to their supporting discs 2, bringing the two discs into contact with opposite ends of the collar is just suflicient to bring the contact point of the metallic member 4 into contact with the surface of the crystal element 3 at a suitable contact pressure, the metallic member having sufficient resilience to take up manufacturing tolerances in the various dimensions concerned. The outer surface of the collar is next tinned with solder, and the assembly of the collar and disc is inserted into the cylinder until it is in a central position along the length of the cylinder. This may conveniently be arranged by placing the cylinder in an upright position on a flat surface, inserting an annular ring in the cylinder, which annular ring will come to rest on the flat surface, and inserting the assembly into the cylinder until it comes to rest on the annular ring. By making the annular ring of the correct length, the assembly is easily positioned in a predetermined position. The cylinder is then heated sufficiently to melt the solder on the collar, so that on cooling the collar is secured in the required position. The reason for making the discs of slightly smaller diameter than the collar is to ensure that the discs do not bind on the side of the cylinder when inserting the assembly in the cylinder.
It will be understood that in the absence of the collar, due to the fact that the metallic member cooperating with the crystal element is normally of small diameter wire, the characteristic impedance of the portion of the device between the two discs would be undesirably high and would be a substantial mismatch with the adjoining portions. It will be appreciated therefore that the collar serves the dual function of maintaining the discs at a predetermined distance apart and of reducing to a more desirable value the characteristic impedance of that portion of the device bounded by the collar, that is the portion between the two discs.
Figure 2 illustrates a slightly modified arrangement of the device which without departing from the scope of the present invention presents an alternative method of obtaining a good point contact between the crystal element and the co-opcrating metal member. In this case the metallic stud 6 associated with the metallic member 4 is concentrically bored throughout its length, the bore 9 being tinned and of a diameter sufficient to accommodate a metal rod in upon which the co-operating metal member is mounted to be passed therethrough and which after adjustment is secured in position by heating the device suificiently to allow the tinning to melt; any excessive projection of the metal rod 19 being severed after soldering.
Although the invention has been described with reference to a double-ended form of crystal contact device, it is to be understood that it is equally applicable to a single-ended crystal contact dedisc no longer being necessary in this case as the coaxial line is connected only to the other end of the cylinder. Moreover, although the collar has been described as a separate member from the cylinder, the collar may in fact be provided integral with the cylinder by forming the cylinder with an intermediate portion of reduced internal diameter. The separate collar is preferred as the integral collar is more difficult to produce to the required degree of accuracy. Moreover, the collar may be of insulating material, provided that the inner surface at least is provided with a metallic coating which is efiectively electrically connected to the cylinder, at any rate at the radio frequencies concerned, so that the collar can still serve to reduce to a more desirable value the characteristic impedance of that portion of the device bounded by the collar.
W e claim:
1. A crystal contact device for use at a radio frequency, said device comprising a hollow metal cylinder, a collar whose inner surface is metallic, said collar being disposed wholly within the metal cylinder, the outer surface of said collar being in contact with the juxtaposed portion of the inner surface of the cylinder over the entire length of the collar, said inner surface of the collar being effectively electrically connected to the cylinder at said radio frequency, a crystalline element and associated supporting member, and a cooperating metal member and associated supporting member, said supporting members being of disc form and situated one against each end of the collar, said crystalline element, said cooperating metal member and said associated supporting members being disposed wholly within the metal cylinder, and said crystalline element and said cooperating metal member being disposed wholly within the collar.
2. A crystal contact device in accordance with claim 1 wherein the collar is metallic.
3. A crystal contact device in accordance with claim 1 wherein the collar is metallic and formed integrally with the hollow metal cylinder.
4. A crystal contact device in accordance with claim 3 wherein the supporting members are of insulating material.
5. A crystal contact device in accordance with claim 4 wherein the crystalline element and the cooperating metal member are coaxially situated within the hollow metal cylinder.
6. A crystal contact device in accordance with claim 1 wherein the collar is metallic and the supporting members are of insulating material.
EMRYS GWYNNE JAMES. AUBREY OSCAR, EDGAR LINDELL.
I References Cited in the file of this patent UNITED STATES PATENTS Number Name Date D. 156,501 Gates Dec. 20, 1949 2,406,405 Salisbury Aug. 27, 1946 2,415,841 Ohl Feb. 18, 1947 2,429,823 Kinman Oct 28, 1947 2,438,110 Brattain Mar. 23, 1948 2,469,569 Ohl May 10, 1949 2,560,579 Kock July 17, 1951 2,560,606 Shive July 17,1951
US140892A 1950-01-27 1950-01-27 Crystal contact device Expired - Lifetime US2662984A (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2894229A (en) * 1959-07-07 Fonda-bonardi
US2929137A (en) * 1957-01-04 1960-03-22 Texas Instruments Inc Method of making ohmic connections to silicon semiconductor devices
US2937439A (en) * 1956-11-21 1960-05-24 Texas Instruments Inc Method of making ohmic connections to semiconductor devices

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2406405A (en) * 1941-05-19 1946-08-27 Sperry Gyroscope Co Inc Coaxial condenser crystal and method of making same
US2415841A (en) * 1944-12-14 1947-02-18 Bell Telephone Labor Inc Conducting material and device and method of making them
US2429823A (en) * 1944-05-01 1947-10-28 Gen Electric Crystal detector
US2438110A (en) * 1943-07-28 1948-03-23 Bell Telephone Labor Inc Electrical translating materials and devices and method of making them
US2469569A (en) * 1945-03-02 1949-05-10 Bell Telephone Labor Inc Point contact negative resistance devices
US2560579A (en) * 1948-08-14 1951-07-17 Bell Telephone Labor Inc Semiconductor amplifier
US2560606A (en) * 1949-04-06 1951-07-17 Bell Telephone Labor Inc Photoresistive translating device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2406405A (en) * 1941-05-19 1946-08-27 Sperry Gyroscope Co Inc Coaxial condenser crystal and method of making same
US2438110A (en) * 1943-07-28 1948-03-23 Bell Telephone Labor Inc Electrical translating materials and devices and method of making them
US2429823A (en) * 1944-05-01 1947-10-28 Gen Electric Crystal detector
US2415841A (en) * 1944-12-14 1947-02-18 Bell Telephone Labor Inc Conducting material and device and method of making them
US2469569A (en) * 1945-03-02 1949-05-10 Bell Telephone Labor Inc Point contact negative resistance devices
US2560579A (en) * 1948-08-14 1951-07-17 Bell Telephone Labor Inc Semiconductor amplifier
US2560606A (en) * 1949-04-06 1951-07-17 Bell Telephone Labor Inc Photoresistive translating device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2894229A (en) * 1959-07-07 Fonda-bonardi
US2937439A (en) * 1956-11-21 1960-05-24 Texas Instruments Inc Method of making ohmic connections to semiconductor devices
US2929137A (en) * 1957-01-04 1960-03-22 Texas Instruments Inc Method of making ohmic connections to silicon semiconductor devices

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