GB700233A - Devices for converting mechanical vibrations to electrical variations - Google Patents

Devices for converting mechanical vibrations to electrical variations

Info

Publication number
GB700233A
GB700233A GB21022/49A GB2102249A GB700233A GB 700233 A GB700233 A GB 700233A GB 21022/49 A GB21022/49 A GB 21022/49A GB 2102249 A GB2102249 A GB 2102249A GB 700233 A GB700233 A GB 700233A
Authority
GB
United Kingdom
Prior art keywords
contact
emitter
electrode
semi
block
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
GB21022/49A
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
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB700233A publication Critical patent/GB700233A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/006Transducers other than those covered by groups H04R9/00 - H04R21/00 using solid state devices
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00Vibration-testing of structures; Shock-testing of structures
    • G01M7/02Vibration-testing by means of a shake table
    • G01M7/025Measuring arrangements
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor 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
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F3/00Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Ceramic Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Computer Hardware Design (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

700,233. Transducers, semi-conductive amplifiers. WESTERN ELECTRIC, CO., Inc. Aug. 12, 1949 [Aug. 19, 1948], No. 21022/49. Class 40 (4) [Also in Group XXXVI] Means for convertingmechanical vibrations into electrical variations comprises a semiconductor amplifier having' at least three electrodes, the contact between one of which and the semi-conductive body being varied in accordance with the vibrations. In a first embodiment (Fig. 1), the semi-conductor amplifier is a block 1 of germanium having emitter and collector electrodes 4 and 5 and a base electrode 6 which may be a plated metal film. The normal sharp point contact of the emitter is replaced by a substantially spherical one of about 2-20 mils. diameter, preferably of carbon or of a silicon compound such as quartz with a tough carbon skin coated thereon. This contact is mounted on one end of a light stiff rod 10 driven by a diaphragm 11. The variations in the pressure of this contact on the surface 2 change the contact area and the spacing between the emitter and collector electrodes and corresponding variations are produced in the collector current. To prevent the output from being noisy, the block surface is smoothly polished either mechanically, electrolytically or both. The same construction may be adapted to act as a reproducer for lateral-cut records by arranging that the contact 4 is varied under the control of a stylus. Fig. 2 (not shown). In the embodiment of Fig. 4 the emitter and collector electrodes 24, 25 are placed on-opposite sides of a block 21 of semi-conductor material with concave surfaces at the thinnest part thereof and a circumferential metal ring 26 serves as the base electrode. The spherical electrode 24 is considerably larger than that of Fig. 1, e.g. 10- 100 mils diameter, but the operation is similar. In the Fig. 5, embodiment for reproducing hill-and-dale records the point of contact of the electrode 24 is altered, but its pressure and contact area are not. Axial movement of the stylus 33 is transmitted by the rod 35 (restrained to move vertically) and the electrode 24 slides over the surface of the semi-conductor block 21 thus altering the distance between the emitter and collector electrodes. To reduce wear in this type of embodiment a Boiling or rocking movement of the .emitter electrode may be employed as shown in Fig. 6. The emitter electrode is a sector of a sharp-edged disc 44 the diameter of which is slightly less than that of the concave surface of the block. It is held in a normal rest position in which its point of contact is slightly misaligned with the collector electrode 25 by a restoring spring 46 serving also as an electrical connection, and is rocked under control of the applied vibrations. Specifications 472,101, 632,942, [ Group XXXVI], 632,980, [Group XL (c)], 694,021, 694,022, [Group XXXVI], 694,023, 694,024, 694,025, 694,026 and 700,232 are referred to.
GB21022/49A 1948-08-19 1949-08-12 Devices for converting mechanical vibrations to electrical variations Expired GB700233A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US700233XA 1948-08-19 1948-08-19

Publications (1)

Publication Number Publication Date
GB700233A true GB700233A (en) 1953-11-25

Family

ID=22092640

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21022/49A Expired GB700233A (en) 1948-08-19 1949-08-12 Devices for converting mechanical vibrations to electrical variations

Country Status (6)

Country Link
BE (1) BE490715A (en)
CH (1) CH275854A (en)
DE (1) DE815493C (en)
FR (1) FR992051A (en)
GB (1) GB700233A (en)
NL (1) NL73417C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE949360C (en) * 1952-01-11 1956-09-20 Patra Patent Treuhand Electric gas discharge lamp, in particular fluorescent lamp
DE1246897B (en) * 1959-09-09 1967-08-10 Itt Ind Ges Mit Beschraenkter Electronic solid state assembly
NL267357A (en) * 1960-07-28
GB1051550A (en) * 1963-09-19
DE1239871B (en) * 1963-12-09 1967-05-03 Siemens Ag Pressure sensitive semiconductor device
DE1245425B (en) * 1965-06-23 1967-07-27 Telefunken Patent Electromechanical converter with mechanically sensitive semiconductor component

Also Published As

Publication number Publication date
CH275854A (en) 1951-06-15
NL73417C (en)
DE815493C (en) 1951-11-19
FR992051A (en) 1951-10-15
BE490715A (en)

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