US3868621A - Variable resistor device - Google Patents

Variable resistor device Download PDF

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Publication number
US3868621A
US3868621A US402008A US40200873A US3868621A US 3868621 A US3868621 A US 3868621A US 402008 A US402008 A US 402008A US 40200873 A US40200873 A US 40200873A US 3868621 A US3868621 A US 3868621A
Authority
US
United States
Prior art keywords
screw shaft
resistive material
contact
movable contact
variable resistor
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
US402008A
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English (en)
Inventor
Nobuo Kitamura
Miroshi Fukagawa
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Application granted granted Critical
Publication of US3868621A publication Critical patent/US3868621A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/38—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path
    • H01C10/40—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path screw operated
    • H01C10/42—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path screw operated the contact bridging and sliding along resistive element and parallel conducting bar or collector
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/14—Adjustable resistors adjustable by auxiliary driving means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/38—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/38—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path
    • H01C10/40—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path screw operated

Definitions

  • a variable resistor device comprising a housing formed by walls, one of which is provided with a resistive material on its inner surface, a rotatable screw shaft mounted in the housing for elongating along the resistive material on the inner surface of the wall and a movable contact having a portion for coming in contact with the resistive material and a portion for engaging with the screw thread of the screw shaft to be shifted in contact with the resistive material by the rotation of the screw shaft, whereby the variable resistance is obtained between one end of the resistive material and the screw shaft.
  • This invention relates generally to mechanical variable. resistor devices, and more particularly to a variable resistor unit having an improved sliding mechanism for changing the resistance value and suitable for being used as avoltage supplying device in voltage controlled tuners of, for example, a television receiver.
  • tuners for a signal receiver such as a television reciever,- whichis adapted to receive selectively a plurality of signals transmitted with-different carrier frequencies, respectively.
  • One of the two types is a mechanically selecting tuner in which a plurality of resonance circuits have resonahtfrequencies corresponding to the signals to'be selectively received, respectively, are provided and these resonance circuits are selected by movable mechanical contacts to receive a selected one of the transmitted signals.
  • the other of the two types is a voltage controlled tuner in which a resonance circuit having a voltage controlled variable reactance element is provided to receive a selected one of the transmitted signals by changing its resonant frequency which can be varied by changing a voltage supplied to the voltage controlled variable reactance element.
  • variable resistor unit In the voltage controlled tuner, a plurality of variable resistor units are used for producing control voltages to be selectively supplied to the voltage controlled variable reactance element to set the resonance circuit to have a resonant frequency corresponding to the selected one of the transmitted signal.
  • the variable resistor unit is required to be able to vary its voltage value continuouslyv in a predetermined range in order to produce several control voltages, each value of which is determined in response to the carrier frequency of the selected signal to be received, although each of the variable resistorunit's, is arranged to produce one of the severalcontrol voltages inactu al use.
  • a sliding mechanism for varying the resistance value is usually provided.
  • variable resistor units have been previously proposed for such a use, however, they need a number of parts and are complicated in construction.
  • An object of this invention is toprovide an improved variable resistor device having a simple mechanism for varying the resistance value therein.
  • Another object of this invention is to provide a compact variable resistor device which contains threin an improved slidable contact for varying the resistance value.
  • Another object of this invention is to provide a compact variable resistor unit suitable for being utilized as a control voltage supplying device for a variable reactance element in a voltage controlled tuner.
  • a variable resistor device of this invention belongs to sliding variable resistors which provides a variable resistance value in response to the position of a sliding contact therein.
  • a housing formed by a plurality of walls is provided and a resistive material is provided, for example, by coating on the inside surface of one of the walls.
  • a rotatable screw shaft is mounted and a contact which is slidable on the resistive material is engaged with the rotatable screw shaft to be moved in contact with the resistive material by the rotation of the screw shaft.
  • This slidable contact is formed by a resilient conductive material, for
  • FIG. I is a perspective view of details of one embodiment of variable resistor devices according to the present invention.
  • FIG. 2 is a plane view of the variable resistor device shown in FIG. I;
  • FIG. 3 is a sectional view taken along the line IIIIII in FIG. 2;
  • FIG. 4 is a sectional view taken along the line lVIV in FIG. 2;
  • FIG. 5 is a side view seen to the line VV in FIG. 2;
  • FIGS. 6 8 are partial views of the variable resistor device shown in FIG. 1;
  • FIG. 9 is a sectional view taken along the line IX-IX in FIG. 7;
  • FIG. 10 is a sectional view taken along the line X-X in FIG. 7; i
  • FIG. 11 is-an enlarged: sectional view of that shown in FIG. 10 used for explanation of one of featured portions of variable resistor devices according to the present invention.
  • DESCRIPTION OF THE PREFERRED EMBODIMENT cording to this invention consists of an elongated housing box 2 the upper surface of which is opened, a rotatable'screw shaft 3 with screw threads which is located in the elongated housing box 2 along its longitudinal direction, a lid board or resistor board 6 which closes the opening 4 of the housing box 2 and has a resistive material coated on its inside surface to form a resistor portion 5 (refer to FIG. 6), and a movable contact 7 which is inserted between the rotatable screw shaft 3 and the resistor portions.
  • the rotatable screw shaft 3 is assembled in the housing box 2 to pass therethrough along its longitudinal direction and is rotatably supported at its both end portions by bores 8 formed in the side end walls of the housing box 2.
  • a gear 9 is formed integrally with the rotatable screw shaft 3 at its one end portion while a resilient plate 10 is insertedto the rotatable screw shaft 3 at its other end portion to thereby prevent the rotatable screw shaft 3 from coming out from the housing box 2.
  • a pair of connecting terminals 11 and 12 are led out through the resistor board 6 from the both ends of the resistive material 5 on the resistor board 6 to the outside surface thereof.
  • Five cutouts 13 of substantially trapezoid configuration are formed on the resistor board 6 at its peripheral portion,'while five projections 14 of corresponding trapezoid configuration are formed on the upper edge of the housing box 2 at predetermined positions, respectively.
  • the five trapezoid cutouts 13 formed in the resistor board 6 receive the five corresponding trapezoid projections 14 formed on the upper edge of the housing box 2, respectively, to close the upper opening 4 of the housing box 2 and thus to form a housing as a whole.
  • a connectingterminal 21 is provided such that its one end is electrically connected to the rotatable screw shaft 3 at one end thereof in the housing box 2 and the other end of the connecting terminal 21 is projected outwardly beyond the resistor. board 6.
  • the movable contact 7 consistsof a resilient conductive plate which is bent. At the topof the bent portion of the movable contact 7, it isembossed to form a pair of left and right contact points 15.
  • One end 16 of the movable contact 7 is bent downwardly with an inclination in accordance with the thread angle of a screw thread 20 formed on the rotatable screw shaft 3, and has formed a cutout 17 of substantially delta shape at'its approximately center position.
  • the delta shape cutout 17 engages with the screw thread 20 of therotatable screw shaft 3.
  • the movable contact 7 has formed integrally therewith, at its other end 18, a pair of guiding portions 19 which extend outwardly therefrom along the rotatable screw shaft 3.
  • the thus formed movable contact 7 is located betweenthe rotatable screw shaft 3 and the resistor portion 5 against its resiliency.
  • the pair of contact points of the movable contact 7 engage with the resistor portion 5
  • the cutout 17 formed in one end 17 of the movable contact-7 engages with the screw thread of therotatable screw'shaft 3 on its upper side
  • the pair of guiding portions 19 formed on one end 18 of the movable contact 7 are supported by therotatable screw shaft 3 by abutment therebetween.
  • variableresistor device 1 constructed as above when employed as a voltage controlled tuner, a plurality of-the variable resistor devices 1 the number of which is,-selected in accordance with that of required channels are arranged. around the channel selecting shaft of a tuner which is intermittently moved ,with a constant pitch in'a turret-like manner.
  • the other end 18 of the movable contact 7 contacts with the upper surface of the rotatable screw shaft 3 through the pair of guiding portions 19.
  • the guiding portions 19 do not engage with the screw thread 20 of the rotatable screw shaft 3 but only contact with the upper surface of the rotatable screw shaft 3 in a manner of gripping the latter. Accordingly, the deviation of the movable contact 7 from the rotatable screw shaft 3-to the left and right directions is prevented by both the guiding portions 19. That is, the two guiding portions 19 act to prevent the movable contact 7 from coming off the rotatable screw shaft 3 and to guide the former along the latter smoothly during the adjustment of the movable contact 7.
  • the movable contact 7, the rotatable screw shaft 3 and the resistor board 6 have the following dynamical construction. That is to say, both the contact points 15 are symmetrically arranged at distances of a and a, which are approximately equal with each other, with respect to the center axis Y-Y which passes through the center of the rotatable screw shaft 3 and is perpendicular to the resistor board 6, so that the movable contact 7 is set at a stable position on the rotatable screw shaft 3 by forces F and F exerted on the contact points 15 causedby the resiliency (spring force) of the movable contact 7 itself and the guiding portions 19.
  • the movable contact 7 can, slide'between the resistor portion Sand the rotatable screw shaft'3 without meandering to provide a stable control voltage, if there is no eccentricity in the rotatable screw shaft 3.
  • a distance b between the center axis of the rotatable screw shaft 3 and the resistor board 6 is selected as small aspossible soas to make the contact points 15 stable as possible with respect to the resistor portion 5.
  • the movable contact is formed of the conductive plate with resiliency, which is bent, and at least one end of the movable contact is made to engage with the rotatable screw shaft to move the movable contact by the vrotatable screw shaftin contact ,with the resistor portion, so that with resistive material on the inner surface thereof,
  • said one wall further being provided with at least one electrical terminal connected to said resistive material
  • a movable contact element positioned on said screw shaft and bidirectionally advanced along said screw shaft in accordance with the rotation thereof, said contact element being formed of a resilient conductive plate bent between end portions thereof to thereby form a contact portion which is resiliently urged into physical contact with said resistive material, one end of said movable contact element being bent into engagement with said screw shaft at an inclination in accordance with the thread angle of said screw threads and being formed of a V-shaped cutout, and the other end of said movable contact element having a pair of guiding portions formed integrally therewith which extend outwardly along said screw shaft so as to not engage with the screw threads but to be supported by said screw shaft by abutment therebetween.
  • said contact portion of said movable contact element is embossed to form a plurality of contact points which are in physical contact with said resistive material.
  • a variable resistor device in accordance with claim 1 wherein one end of said screw shaft is provided with a gear to receive a driving gear in meshing engagement therewith to thereby rotate said screw shaft.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
US402008A 1972-10-04 1973-10-01 Variable resistor device Expired - Lifetime US3868621A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972115216U JPS5241562Y2 (zh) 1972-10-04 1972-10-04

Publications (1)

Publication Number Publication Date
US3868621A true US3868621A (en) 1975-02-25

Family

ID=14657225

Family Applications (1)

Application Number Title Priority Date Filing Date
US402008A Expired - Lifetime US3868621A (en) 1972-10-04 1973-10-01 Variable resistor device

Country Status (10)

Country Link
US (1) US3868621A (zh)
JP (1) JPS5241562Y2 (zh)
BR (1) BR7307695D0 (zh)
CA (1) CA994881A (zh)
DE (1) DE2349540A1 (zh)
ES (1) ES419316A1 (zh)
FR (1) FR2202345B1 (zh)
GB (1) GB1424914A (zh)
IT (1) IT995591B (zh)
NL (1) NL7313685A (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987389A (en) * 1973-12-27 1976-10-19 Matsushita Electric Industrial Co., Ltd. Variable resistor device
US4056795A (en) * 1976-06-29 1977-11-01 General Instrument Corporation Wiper contact for turret-type varactor controller
US20060098702A1 (en) * 2004-11-08 2006-05-11 Brooks Christopher R Alterable frequency coherent light generator
USD962869S1 (en) * 2019-12-13 2022-09-06 Mitutoyo Corporation Resistor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745054A (en) * 1952-10-16 1956-05-08 Honeywell Regulator Co Electrical apparatus for measuring
US2938186A (en) * 1956-10-30 1960-05-24 Yucaipa Instr Ltd Inc Trimming potentiometer
US3399369A (en) * 1966-08-17 1968-08-27 Spectrol Electronics Corp Potentiometer having housing formed of electrically non-conductive material inculding integral hinge section and method of making the same
US3665364A (en) * 1969-07-18 1972-05-23 Electro Reistance Soc Fr De L Fine-adjustment potentiometer
US3732520A (en) * 1969-01-02 1973-05-08 Cts Corp Variable resistance control and method of assembling same
US3742421A (en) * 1970-10-20 1973-06-26 Philips Corp Potentiometer having a transport screw and diamond shaped contact spring

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL141684B (nl) * 1968-06-11 1974-03-15 Philips Nv Potentiometer met transportschroef.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745054A (en) * 1952-10-16 1956-05-08 Honeywell Regulator Co Electrical apparatus for measuring
US2938186A (en) * 1956-10-30 1960-05-24 Yucaipa Instr Ltd Inc Trimming potentiometer
US3399369A (en) * 1966-08-17 1968-08-27 Spectrol Electronics Corp Potentiometer having housing formed of electrically non-conductive material inculding integral hinge section and method of making the same
US3732520A (en) * 1969-01-02 1973-05-08 Cts Corp Variable resistance control and method of assembling same
US3665364A (en) * 1969-07-18 1972-05-23 Electro Reistance Soc Fr De L Fine-adjustment potentiometer
US3742421A (en) * 1970-10-20 1973-06-26 Philips Corp Potentiometer having a transport screw and diamond shaped contact spring

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987389A (en) * 1973-12-27 1976-10-19 Matsushita Electric Industrial Co., Ltd. Variable resistor device
US4056795A (en) * 1976-06-29 1977-11-01 General Instrument Corporation Wiper contact for turret-type varactor controller
US20060098702A1 (en) * 2004-11-08 2006-05-11 Brooks Christopher R Alterable frequency coherent light generator
US7366212B2 (en) * 2004-11-08 2008-04-29 Christopher Raphael Brooks Alterable frequency coherent light generator
USD962869S1 (en) * 2019-12-13 2022-09-06 Mitutoyo Corporation Resistor

Also Published As

Publication number Publication date
ES419316A1 (es) 1976-07-01
NL7313685A (zh) 1974-04-08
IT995591B (it) 1975-11-20
BR7307695D0 (pt) 1974-08-22
JPS5241562Y2 (zh) 1977-09-20
DE2349540A1 (de) 1974-04-11
FR2202345B1 (zh) 1977-08-05
JPS4982233U (zh) 1974-07-17
CA994881A (en) 1976-08-10
GB1424914A (en) 1976-02-11
FR2202345A1 (zh) 1974-05-03

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