US3886514A - Variable resistor - Google Patents

Variable resistor Download PDF

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Publication number
US3886514A
US3886514A US338583A US33858373A US3886514A US 3886514 A US3886514 A US 3886514A US 338583 A US338583 A US 338583A US 33858373 A US33858373 A US 33858373A US 3886514 A US3886514 A US 3886514A
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United States
Prior art keywords
resistance elements
wiper arm
pair
resistance
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
US338583A
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English (en)
Inventor
Shunzo Oka
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
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Publication of US3886514A publication Critical patent/US3886514A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/16—Adjustable resistors including plural resistive elements
    • H01C10/20—Contact structure or movable resistive elements being ganged

Definitions

  • FIG. 4 PRIOR ART SECOND V2 CHANNEL PAIENIEDIIIIY 2'! ms SHEET FIG. 4
  • the present invention relates to a variable resistor especially adapted for use in a stereophonic reproduction system.
  • a variable resistor In a stereophonic reproduction system, in order to attain the balance between the volumes of the different channels, a variable resistor is generally provided of the type in which, when an operating lever or the like is operated, the resistance between one terminal of the resistor and a wiper arm is increased while the resistance between the other terminal of the resistor and the wiper arm is reduced.
  • the audio signal circuits of two different channels are connected between the wiper arm and the ends of the resistor so that as the wiper arm is moved, the resistance to one channel is increased whereas the resistance to the other channel is reduced, thereby attaining the balance of the volumes of the two channels. Since the terminal of one channel is electrically connected through the resistor to the terminal of the other channel, crosstalk between the channels is produced due to the contact resistance between the wiper arm and the resistor.
  • One of the objects of the present invention is therefore to provide a variable resistor for a stereophonic reproduction system which may prevent crosstalk.
  • a variable resistor in accordance with the present invention comprises a plurality of resistor structures electrically insulated from each other and at least one wiper arm bridging between at least two of a plurality of resistor structures.
  • the terminals of the resistor structures are electrically insulated from each other, and the electrical connection between the terminals is established only through the wiper arm and the resistor structures.
  • FIG. I is a circuit diagram of a prior art variable resistor
  • FIG. 2 is a top view of a first embodiment of the present invention
  • FIG. 3 is a top view of a second embodiment of the present invention.
  • FIGS. 4 and 5 are circuit diagrams of the variable resistors shown in FIGS. 2 and 3, respectively;
  • FIG. 6 is a top view of a variation of the variable resistor shown in FIG. 3;
  • FIG. 7 is a top view of a variation of the variable resistor shown in FIG. 2.
  • FIG. 1 illustrating a circuit diagram of a prior art variable resistor
  • a first channel is connected to a terminal I and a ground tenninal 2 whereas a second channel is connected to a terminal 3 and another ground terminal 2a.
  • V. of the first channel When the audio signal voltage V. of the first channel is applied across the terminals 1 and 2, a voltage V is produced across the terminals 3 and 2a on the side of the second channel because there is a contact resistance between a wiper arm 4 and a resistor 5.
  • the current I flowing from the first channel is divided into a current i, flowing into the wiper arm 4 and a current i flowing into the second channel.
  • the audio signals from the first channel adversely affect the second channel, and the same is true for the audio signals from the second channel.
  • the above phenomenon is one of the major causes of crosstalk produced in a high-quality stereophonic system.
  • the level of crosstalk is of the order of 30 dB to 40 dB.
  • FIGS. 2 and 4 Referring to FIG. 2 illustrating a first embodiment of the present invention, 6 and 6a denote film resistors of carbon formed upon a base 12 made of an insulating material; 7 and 7a denote, silver terminals at first ends of the film resistors 6 and 6a, respectively forming resistor structures therewith; 8 and 8a denote, contacts of a wiper arm 9 in contact with the film resistors 6 and 6a or the silver terminals 7 and 7a, respectively; 10 and 10a denote, terminals of the variable resistor for external connection; and 11 denote, an insulator interposed between the pair of silver terminals 7 and 7a, so that pair of resistor structures consisting of the thin-film resistors 6 and 6a and the silver terminals 7 and 7a are electrically insulated from each other.
  • the insulator 11 between the pair of silver terminals 7 and 7a is a part of the horse-shoe shaped base 12 upon which are formed the thin-film resistors 6 and 6a
  • FIGS 3 and 5 A second embodiment shown in FIG. 3 is substantially similar in construction to the first embodiment shown in FIG. 2 except that a rectangular base 13 made of an insulating material is used and the wiper arm 9 is rectilinearly slidable.
  • FIGS. 4 and 5 illustrating the circuit diagrams of the first and second respectively the wiper arm 9 is electrically connected to a ground terminal 14.
  • FIG. 6 A variation of the second embodiment is shown in FIG. 6.
  • the embodiment shown in FIG. 7 is substantially similar to the first embodiment except that two pairs of the resistor structures are formed upon the horse-shoe shaped base 12.
  • the variable resistor of the type shown in FIG. 7 is adapted for use in a fourchannel stereophonic system. That is, the first and second channels are connected to the left terminals 10 and 10a and to the wiper arm 9 whereas the third and fourth channels are connected, to the right terminals 10 and 10a and the wiper arm 9.
  • variable resistors of the present invention with the construction described above, a pair of resistor structures are electrically insulated from each other by the insulator 11, and the electrical connection between the pair of terminals 10 and 10a is possible only through the wiper arm 9. Therefore, the voltage due to the resistance between the contact 8 or 8a of the wiper arm 9 and the film resistor 6 or 6a will not affect the adjustable resistance of the other resistor structure so that leakage current between the resistors may be prevented. As a result crosstalk may be effectively pre vented and the performance of a stereophonic system incorporating the variable resistors of the present invention may be remarkably improved.
  • a variable resistor comprising a. a substantially planar base made of an insulating material
  • a wiper arm electrically and mechanically bridging sais pair of film resistance elements and movably arranged to slide from one end of the pair of elements to the other while maintaining electrical contact therewith,
  • a second terminal on said planar base electrically connected to the other of said pair of film resistance elements on an end of the pair of resistance elements opposite the end to which the first terminal is connected, whereby movement of said wiper arm from one end of the pair of resistance elements to the other increases the electrical resistance between the wiper arm and one of the terminals and decreases the resistance between the wiper arm and the other terminal, said increase in electrical resistance being substantially equal to said decrease, and
  • terminals being electrically connected solely through said film resistance elements and said wiper arm.
  • each of said resistance elements has an arcuate form. the resistance elements being symmetrically arranged on an imaginary circle coplanar with that base, and further comprising means for rotatively mounting said wiper arm about an axis that is coaxial with the center of said imaginary circle.
  • variable resistor as defined in claim 1, wherein said resistance elements are linear and mutually parallel and wherein said wiper arm is confined to longitudinal motion in a direction parallel to the pair of resistance elements.
  • each of said resistance elements has an arcuate form, the resistance elements being arranged on adjacent arcs of two imaginary concentric circles coplanar with the base and having radii of different sizes, and further comprising means for rotatively mounting said wiper arm about an axis that is coaxial with the center of said imaginary circles, a second pair of arcuate resistor structures deposited on the base on two further adjacent arcs of said two imaginary circles, and further comprising a second wiper arm bridging said second pair of resistance elements and coaxially rotatable with said first wiper arm.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
  • Stereophonic System (AREA)
US338583A 1972-03-10 1973-03-06 Variable resistor Expired - Lifetime US3886514A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47024906A JPS4892868A (enExample) 1972-03-10 1972-03-10

Publications (1)

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US3886514A true US3886514A (en) 1975-05-27

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US338583A Expired - Lifetime US3886514A (en) 1972-03-10 1973-03-06 Variable resistor

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US (1) US3886514A (enExample)
JP (1) JPS4892868A (enExample)
CA (1) CA973268A (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300114A (en) * 1980-01-23 1981-11-10 General Motors Corporation Manually adjustable resistor device
US5291176A (en) * 1991-06-24 1994-03-01 Sony Corporation Slide type variable resistor
US20110277742A1 (en) * 2010-05-12 2011-11-17 Bsh Home Appliances Corporation Slide-in simmer potentiometer for a household appliance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50149001U (enExample) * 1974-05-27 1975-12-11

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1917097A (en) * 1931-05-29 1933-07-04 Dolph O Clegg Generator regulator for automotive vehicles
US3343115A (en) * 1964-12-02 1967-09-19 Beckman Instruments Inc Electrical resistance element
US3456228A (en) * 1964-07-01 1969-07-15 Charles S Wright Variable resistors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1917097A (en) * 1931-05-29 1933-07-04 Dolph O Clegg Generator regulator for automotive vehicles
US3456228A (en) * 1964-07-01 1969-07-15 Charles S Wright Variable resistors
US3343115A (en) * 1964-12-02 1967-09-19 Beckman Instruments Inc Electrical resistance element

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300114A (en) * 1980-01-23 1981-11-10 General Motors Corporation Manually adjustable resistor device
US5291176A (en) * 1991-06-24 1994-03-01 Sony Corporation Slide type variable resistor
US20110277742A1 (en) * 2010-05-12 2011-11-17 Bsh Home Appliances Corporation Slide-in simmer potentiometer for a household appliance
US9080775B2 (en) * 2010-05-12 2015-07-14 Bsh Home Appliances Corporation Slide-in simmer potentiometer for a household appliance

Also Published As

Publication number Publication date
CA973268A (en) 1975-08-19
JPS4892868A (enExample) 1973-12-01

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