CN210110451U - Miniature potentiometer - Google Patents

Abstract

The utility model provides a miniature potentiometer, include: the resistance adjusting piece comprises a metal sheet and a fixed seat; the rotor runs through the casing inside and outside to be connected with the fixing base, the sheetmetal is "ten" font structure, has first end, the second tip relative with first end, third end and the fourth tip relative with the third end, first end and second end upwards perk are fixed in on the fixing base, the third end is located the axle center position of rotor, fourth end sliding electrical contact is on the resistive patch, the pin is equipped with threely, the third end of the both ends of electrical contact resistive patch and sheetmetal respectively to extend to the casing outside. Has the characteristics of good structural stability, simple structure and the like.

Description

Miniature potentiometer

Technical Field

The utility model relates to a potentiometre field, concretely relates to miniature potentiometre that structural stability is good.

Background

A Potentiometer is a type of variable resistor, which consists of a resistive sheet and a rotating or sliding system. When a voltage is applied between two fixed contacts of the resistance card, the position of the contact on the resistance card is changed through a rotating or sliding system, and a voltage which has a certain relation with the position of the moving contact can be obtained between the moving contact and the fixed contact. It is mostly used as a voltage divider, when the potentiometer is a four-terminal element. The potentiometer is basically a slide rheostat and has several types, and is generally used for volume adjustment and laser head power adjustment.

When the potentiometer is used as a volume adjusting device on a hearing aid, the hearing aid is a very small electronic product and helps a hearing-impaired person to better receive external sound, and the potentiometer is smaller in size and is generally a miniature potentiometer with the diameter of about 2 millimeters; however, the miniature potentiometer has a small size, and has a high requirement on the stability of the structure, especially the stability of the sliding fit between the metal sheet and the resistor sheet.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a miniature potentiometer with good structural stability.

In order to achieve the above purpose, the utility model provides a technical scheme as follows:

a micro-potentiometer, comprising: the resistance adjusting piece comprises a metal sheet and a fixed seat; the rotor runs through the casing inside and outside to be connected with the fixing base, the sheetmetal is "ten" font structure, has first end, the second tip relative with first end, third end and the fourth tip relative with the third end, first end and second end upwards perk are fixed in on the fixing base, the third end is located the axle center position of rotor, fourth end slidable and electrical contact on the resistive patch, the pin is equipped with threely, the third end of the both ends of electrical contact resistive patch and sheetmetal respectively to extend to the casing outside.

Furthermore, the third end portion and the fourth end portion of the metal sheet are provided with contacts in a protruding mode, and the corresponding pins and the corresponding resistance sheets are electrically contacted through the contacts respectively.

Furthermore, a cross-shaped fixing groove is formed in the fixing seat, and the metal sheet is positioned in the fixing groove.

Furthermore, the resistor disc is a carbon film resistor disc.

Furthermore, a straight-line-shaped cutter groove or a cross-shaped cutter groove is formed at the outer end part of the rotor.

Furthermore, the outer surface of the shell is provided with a limit groove, the groove wall of the limit groove extends inwards to form a limit convex part, the rotor is accommodated in the limit groove, and a rotor convex part matched with the limit convex part to realize rotation limit is protruded towards the outer end.

Further, the casing includes last casing and lower apron that the cross-section is "H" shape structure, it has upper groove body and lower groove body that the opening is up to go up the casing, the sealed lid of lower apron closes on lower groove body to enclose jointly and close and form the holding chamber, go up the groove body and be the spacing groove, keep apart and seted up the mounting hole on the baffle between upper groove body and the lower groove body, the rotor holding in the spacing inslot to penetrate through the mounting hole the holding intracavity is connected with the fixing base, the resistance card pastes on the lower apron, the pin runs through the inside and outside of lower apron.

Furthermore, the inside wall of the lower groove body of the upper shell is provided with a step part, and the lower cover plate is abutted to the step part.

Furthermore, the open-ended terminal surface of lower cell body still protrusion in the surface of apron down, and then form a sealed cell body, the internal coating of sealed groove has sealing glue layer.

Through the utility model provides a technical scheme has following beneficial effect:

the metal sheet is of a cross-shaped structure, wherein a group of first end parts and second end parts which are opposite to each other are tilted upwards and fixed on the fixed seat to realize stable fixed connection, the third end part is positioned at the axis position of the rotor, the fourth end part can slide and is electrically contacted with the resistor sheet, and when the rotor rotates, the fixed seat and the metal sheet are driven to rotate by taking the third end part of the metal sheet as a center to change the resistance value between the pins to realize adjustment; the structure stability is good, the structure is simple, and the device is suitable for a micro structure.

Drawings

FIG. 1 is a schematic perspective view of a micro-potentiometer according to an embodiment;

FIG. 2 is a sectional view of a micro-potentiometer according to an embodiment;

FIG. 3 is an exploded view of the micro-potentiometer of the embodiment;

FIG. 4 is a schematic structural view of a rotor in the embodiment;

FIG. 5 is a schematic structural view of an upper case in the embodiment;

FIG. 6 is a schematic structural view of the fixing base in the embodiment;

FIG. 7 is a schematic view showing the assembly of the lower cover plate and the resistor disc in the embodiment;

FIG. 8 is a schematic structural view of a metal sheet in an embodiment;

fig. 9 is a schematic structural view of the metal sheet at another angle in the embodiment.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1 to 9, the present invention provides a micro-potentiometer, which is specifically a micro-potentiometer with a diameter of 1.9mm, but is not limited thereto in other embodiments. The micro-potentiometer includes: the resistance adjusting device comprises a shell 10 with a containing cavity (not shown), a rotor 20, pins 50, a resistance sheet 60 and a resistance adjusting piece, wherein the resistance sheet 60 and the resistance adjusting piece are arranged in the containing cavity, and the resistance adjusting piece comprises a metal sheet 40 and a fixed seat 30; the rotor 20 penetrates through the inside and outside of the housing 10 and is connected with the fixed seat 30, the metal sheet 40 is of a cross-shaped structure and is provided with a first end portion 401, a second end portion 402 and a third end portion 403 which are opposite to the first end portion 401, and a fourth end portion 404 which is opposite to the third end portion 403, the first end portion 401 and the second end portion 402 are tilted upwards and fixed on the fixed seat 30, the third end portion 403 is located at the axis position of the rotor 20, the fourth end portion 404 can slide and is in electric contact with the resistance sheet 60, the number of the pins 50 is three, the pins respectively electrically contact the two ends of the resistance sheet 60 and the third end portion of the metal sheet 40, and the pins extend to the outside of the housing 10. Specifically, the three pins 50 are a first pin 51, a second pin 52 and a third pin 53, respectively, the first pin 51 and the second pin 52 are electrically contacted with two ends of the resistor sheet 60, respectively, and the third pin 53 is electrically contacted with the third end 403 of the metal sheet 40.

The metal sheet 40 is in a cross-shaped structure, wherein a group of first end portion 401 and second end portion 402 opposite to each other are tilted upward and fixed on the fixing base 30 to realize stable fixed connection, the third end portion 403 is located at the axis position of the rotor 20, the fourth end portion 404 is capable of sliding and electrically contacting the resistor sheet 30, and when the rotor 20 rotates, the fixing base 30 and the metal sheet 40 are driven to rotate around the third end portion 403 of the metal sheet 40 (namely, the axis position of the rotor 20) to change the resistance value between the pins 50, namely, the resistance values between the first pin 51 and the third pin 53 and between the second pin 52 and the third pin 53, so as to realize adjustment; the structure stability is good, the structure is simple, and the device is suitable for a micro structure.

Further, in this embodiment, the third end portion 403 and the fourth end portion 403 of the metal sheet 40 are both provided with the contact 41 in a protruding manner, and the corresponding pin (i.e., the third pin 53) and the resistive sheet 60 are electrically contacted through the contact 41, respectively, so that the electrical contact performance is good. Of course, in other embodiments, the raised contact structure may not be required.

Further, in this embodiment, the metal sheet 40 is specifically a metal elastic sheet, which has a certain elastic deformation capability, and when being connected to other structures (such as the pin 50, the resistor sheet 60, or the fixing base 30), the metal elastic sheet can be slightly elastically deformed through interference fit, so that the contact of the metal elastic sheet is firmer. Of course, in other embodiments, a metal sheet without elastic deformation capability may be directly used.

Further, in this embodiment, a long slot hole 301 is formed in the center of the fixing base 30, and the insertion end 22 of the rotor 20 is matched with the outer shape of the long slot hole of the fixing base and inserted into the long slot hole 301 of the fixing base 30, so as to fix the rotor 20 and the fixing base 30 in the circumferential direction. Of course, in other embodiments, the connection structure of the rotor 20 and the fixing base 30 may also adopt other structures.

Furthermore, in this embodiment, the fixing seat 30 is provided with a cross-shaped fixing groove 302, the metal sheet 40 is positioned in the fixing groove 302, and the fixing groove 302 plays a role in positioning and fixing the metal sheet 40, so that the metal sheet 40 is accurately positioned and is not easy to shift. Of course, in other embodiments, other positioning structures may be provided to position the metal sheet 40, or positioning structures and the like may not be required.

Further, in this embodiment, the resistance sheet 60 is a carbon film resistance sheet, which has the characteristics of low cost, low friction coefficient and low wear, and has better stability of sliding fit, and is a more conventional resistance sheet type in the current potentiometer. Of course, in other embodiments, other types of resistive patches may be used, such as metal film resistive patches, metal oxide film resistive patches, and the like.

Further, in the present embodiment, a straight-line-shaped slot 21 is formed at an outer end portion of the rotor 20. For cooperating with an external tool, such as a screwdriver, for performing the rotation operation of the driving rotor 20. Of course, in other embodiments, the matching structure, such as a cross-shaped tool slot, may be specifically configured according to the type of the actual tool.

Further, in this embodiment, the outer surface of the housing 10 has a limit groove 111, a limit protrusion 1111 extends inward from a groove wall of the limit groove 111, the rotor 20 is accommodated in the limit groove 111, and a rotor protrusion 23 that cooperates with the limit protrusion 1111 to realize rotational limit protrudes to an outer side end, when the rotor 20 rotates until the rotor protrusion 23 abuts against the limit protrusion 1111, the rotor is limited to continue rotating, the limit protrusion 1111 of the limit groove 111 cooperates with the rotor protrusion 23 to limit the rotation angle of the rotor 20 and the metal sheet 40 that synchronously operates with the rotor 20, so as to limit the sliding position of the fourth end 404 of the metal sheet 40 on the resistance sheet 30, so that the potentiometer can be adjusted within a set range, and the effect is better; and the limiting structure is arranged between the limiting groove 111 on the outer surface of the shell 10 and the rotor 20, which is easy to realize. Of course, in other embodiments, the structure of the adjustment restriction is not limited to this, and may be provided between the metal sheet 40 and the resistance sheet 60; or, according to the actual requirement, it is not limited.

Further, in this embodiment, the housing 10 includes an upper housing 11 and a lower cover plate 12, the cross-section of which is an "H" shaped structure, the upper housing 11 has an upper groove body with an upward opening and a lower groove body 113 with a downward opening, the lower cover plate 12 is hermetically covered on the lower groove body 113 and jointly encloses to form an accommodating cavity, the upper groove body is the limiting groove 111, a partition 112 separating the upper groove body 111 from the lower groove body 113 is provided with an installation hole 1121, the rotor 20 is accommodated in the limiting groove 111 and penetrates through the accommodating cavity through the installation hole 1121 to be connected with the fixing base 30, the resistor disc 60 is attached to the lower cover plate 12, the pins 50 penetrate through the inner side and the outer side of the lower cover plate 12, specifically, three through holes 121 for the pins 50 to penetrate through are provided in the lower cover plate 12, and the pins 50 penetrate through the inner side and the outer side of the lower cover plate 12 through the. The housing 10 can be assembled well, so that the structure is simpler and the assembly is easy. Of course, in other embodiments, the housing 10 may be assembled by other structures.

Still further, the inner side wall of the lower groove 113 of the upper housing 11 is provided with a step portion (not shown), and the lower cover plate 12 abuts against the step portion, so that the lower cover plate 12 and the upper housing 11 are accurately assembled.

Still further, the end face of the opening of the lower groove 113 protrudes out of the outer surface of the lower cover plate 12, so as to form a sealed groove, and a sealing adhesive layer (not shown) is coated in the sealed groove. The structure of sealed cell body can hold sealed glue film, effectively prevents sealed glue excessive, and it is little to have an effect to the outward appearance, and sealed effectual.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. A micro-potentiometer, comprising: the resistance adjusting piece comprises a metal sheet and a fixed seat; the rotor runs through the casing inside and outside to be connected with the fixing base, the sheetmetal is "ten" font structure, has first end, the second tip relative with first end, third end and the fourth tip relative with the third end, first end and second end upwards perk are fixed in on the fixing base, the third end is located the axle center position of rotor, fourth end slidable and electrical contact on the resistive patch, the pin is equipped with threely, the third end of the both ends of electrical contact resistive patch and sheetmetal respectively to extend to the casing outside.

2. The micropotentioner of claim 1, wherein: and the third end part and the fourth end part of the metal sheet are both provided with contacts in a protruding mode and are respectively in electric contact with the corresponding pins and the resistor sheet through the contacts.

3. The micropotentioner of claim 1, wherein: the fixing seat is provided with a cross-shaped fixing groove, and the metal sheet is positioned in the fixing groove.

4. The micropotentioner of claim 1, wherein: the resistance card is a carbon film resistance card.

5. The micropotentioner of claim 1, wherein: the outer end part of the rotor is provided with a straight-line-shaped cutter groove or a cross-shaped cutter groove.

6. The micropotentioner of claim 1, wherein: the outer surface of the shell is provided with a limiting groove, the groove wall of the limiting groove extends inwards to form a limiting convex part, the rotor is contained in the limiting groove, and a rotor convex part matched with the limiting convex part to realize rotation limiting is protruded to the outer side end.

7. The micropotentioner of claim 6, wherein: the casing includes upper housing and lower apron that the cross-section is "H" shape structure, upper housing has the upper tank body that the opening faces upwards and the lower tank body that the opening faces downwards, the sealed lid of lower apron closes on lower tank body to enclose jointly and close and form the holding chamber, upper tank body is the spacing groove, has seted up the mounting hole on keeping apart the baffle between upper tank body and the lower tank body, the rotor holding in the spacing inslot to penetrate through the mounting hole the holding intracavity is connected with the fixing base, the resistance card pastes and locates on the lower apron, the pin runs through the inside and outside of lower apron.

8. The micropotentioner of claim 7, wherein: the inside wall of the lower groove body of the upper shell is provided with a step part, and the lower cover plate is abutted to the step part.

9. The micropotentioner of claim 7, wherein: the open-ended terminal surface of lower cell body still protrudes in the surface of apron down, and then forms a sealed cell body, the internal coating of sealed groove has sealing glue layer.

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