Miniature potentiometer

Abstract

The miniature potentiometer comprises a rubber shell, a variable resistance suite and a cover body. A printing carbon film is arranged in the rubber shell, the rubber shell is provided with a three-end connecting piece, the three-end connecting piece is connected with the printing carbon film, the three-end connecting piece is provided with a connecting hole, and the connecting hole is covered with a copper foil; the variable resistance suite comprises a rubber rotor, an electric brush, an inner sealing ring and an outer sealing ring, the electric brush is riveted on the rubber rotor, one end of the rubber rotor is sleeved with the inner sealing ring, the other end of the rubber rotor is sleeved with the outer sealing ring, the rubber rotor is arranged in the rubber shell, and the rubber rotor can rotate relative to the rubber shell; the cover body covers the rubber shell, and the cover body is welded with the rubber shell. Through the inner sealing ring and the outer sealing ring, the micro potentiometer has two layers of waterproof structures, so that the sealing performance of the micro potentiometer is improved, and the situation that water enters the micro potentiometer, and the micro potentiometer is short-circuited and cannot work normally is effectively prevented.

Description

Technical Field

[0001] The present application relates to the technical field of potentiometers, and in particular to a miniature potentiometer. Background Art

[0002] A potentiometer is a resistor element whose resistance value can be adjusted according to a certain law of change. A potentiometer is usually composed of a resistor and a movable brush. When the brush moves along the resistor, a resistance value or voltage that is related to the displacement is obtained at the output end. Due to the principle characteristics of the potentiometer, it is widely used in application scenarios such as volume control and brightness adjustment.

[0003] In the related art, the potentiometer has the following defects: poor sealing performance. As a miniature electronic device, the potentiometer will inevitably be affected by the external environment. If the sealing performance of the potentiometer is poor, moisture is very likely to enter the potentiometer and cause it to short-circuit, thereby preventing it from working normally. Utility Model Content

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a miniature potentiometer with good sealing performance.

[0005] A first aspect of the present application provides a miniature potentiometer, comprising:

[0006] A plastic shell, wherein a printed carbon film is arranged inside the plastic shell, the plastic shell is provided with a three-terminal connector, the three-terminal connector is connected to the printed carbon film, the three-terminal connector is provided with a connecting hole, and the connecting hole is covered with copper foil;

[0007] A variable resistor kit, the variable resistor kit comprising a transfer plate, a brush, an inner sealing ring and an outer sealing ring, the brush being riveted on the transfer plate, the inner sealing ring being sleeved on one end of the transfer plate, the outer sealing ring being sleeved on the other end of the transfer plate, the transfer plate being arranged in the plastic shell, and the transfer plate being rotatable relative to the plastic shell; and

[0008] The cover body is disposed on the plastic shell, and the cover body and the plastic shell are welded.

[0009] Furthermore, in one of the embodiments, a plurality of contact protrusions are provided at one end of the brush, and each of the contact protrusions is used to contact the printed carbon film.

[0010] Furthermore, in one of the embodiments, the plastic shell is provided with a positioning terminal at a side wall position, and the positioning terminal is provided with a connecting hole.

[0011] Furthermore, in one of the embodiments, the positioning terminals are distributed in an axisymmetric manner about the central axis of the plastic shell.

[0012] Furthermore, in one of the embodiments, the cover body is provided with a window hole.

[0013] Furthermore, in one of the embodiments, the printed carbon film is ring-shaped.

[0014] Furthermore, in one of the embodiments, the inner sealing ring and the outer sealing ring are both in an "O"-shaped structure.

[0015] The miniature potentiometer of the present application includes: a plastic shell, a variable resistance kit and a cover body. A printed carbon film is provided inside the plastic shell, and the plastic shell is provided with a three-terminal connector, which is connected to the printed carbon film, and the three-terminal connector is provided with a connecting hole, and the connecting hole is covered with copper foil; the variable resistance kit includes a plastic transfer plate, a brush, an inner sealing ring and an outer sealing ring, the brush is riveted on the plastic transfer plate, the inner sealing ring is sleeved on one end of the plastic transfer plate, and the outer sealing ring is sleeved on the other end of the plastic transfer plate, the plastic transfer plate is arranged in the plastic shell, and the plastic transfer plate can rotate relative to the plastic shell; the cover body is covered on the plastic shell, and the cover body is fused to the plastic shell. The present application uses the inner sealing ring and the outer sealing ring to make the miniature potentiometer have a two-layer waterproof structure, improve the sealing performance of the miniature potentiometer, and effectively prevent moisture from entering the miniature potentiometer to cause it to short-circuit and fail to work normally.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0018] Figure 1 is an exploded schematic diagram of a miniature potentiometer shown from a first perspective of an embodiment of the present application;

[0019] Figure 2 It is a schematic diagram of the structure of the plastic shell shown from a first perspective of an embodiment of the present application. DETAILED DESCRIPTION

[0020] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0021] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0022] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In the related art, the potentiometer has the following defects: poor sealing performance. As a miniature electronic device, the potentiometer will inevitably be affected by the external environment. If the sealing performance of the potentiometer is poor, moisture is very likely to enter the potentiometer and cause it to short-circuit, thereby preventing it from working normally.

[0025] Therefore, in order to solve the above technical problems, the present application provides a miniature potentiometer with good sealing performance.

[0026] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0027] Figure 1 Shown is a schematic structural diagram of a miniature potentiometer in one embodiment of the present application.

[0028] See also Figure 1A miniature potentiometer 100 includes a plastic shell 110, a variable resistance kit 120 and a cover 130. The plastic shell 110 and the cover 130 are basic structural components, and the plastic shell 110 and the cover 130 together form a receiving cavity for receiving the variable resistance kit 120. The variable resistance kit 120 is used to change the output resistance value and is the core structure of the miniature potentiometer 10.

[0029] See also Figure 1 and Figure 2 , a printed carbon film 111 is provided inside the plastic shell 110, and the plastic shell 110 is provided with a three-terminal connector 112, the three-terminal connector 112 is connected to the printed carbon film 111, and the three-terminal connector 111 is provided with a connecting hole 1111, and the connecting hole 1111 is covered with a copper foil 1111a. In this way, it should be noted that the printed carbon film 111 is the resistance part of the miniature potentiometer 100. The three-terminal connector 112 is connected to the printed carbon film 111 on one hand, and is connected to an external device on the other hand, and the resistance of the printed carbon film 111 is output to the external device to realize the corresponding function. The copper foil 1111a plays a conductive role, and the external device realizes an electrical connection with the miniature potentiometer 10 through the copper foil 1111a covered by the connecting hole 1111. In this embodiment, the printed carbon film 111 is ring-shaped.

[0030] See also Figure 1 The variable resistor set 120 includes a plastic transfer sheet 121, a brush 122, an inner seal ring 123 and an outer seal ring 124. The brush 122 is riveted on the plastic transfer sheet 121. The inner seal ring 123 is sleeved on one end of the plastic transfer sheet 121. The outer seal ring 124 is sleeved on the other end of the plastic transfer sheet 121. The plastic transfer sheet 121 is arranged in the plastic shell 110, and the plastic transfer sheet 121 can rotate relative to the plastic shell 110. In this way, it should be noted that the plastic transfer sheet 121 can rotate relative to the plastic shell 110. When the resistance value of the miniature potentiometer 10 needs to be changed, the brush 122 can be moved to the corresponding position by rotating the plastic transfer sheet 121, and the operation is simple and convenient.

[0031] The present application provides the miniature potentiometer 10 with a two-layer waterproof structure through the inner sealing ring 123 and the outer sealing ring 124, thereby improving the sealing performance of the miniature potentiometer 10 and effectively preventing moisture from entering the miniature potentiometer 10 and causing it to short-circuit and fail to work properly. In this embodiment, the inner sealing ring 123 and the outer sealing ring 134 are both in an "O"-shaped structure.

[0032] See also Figure 1, the cover 130 is covered on the plastic shell 110, and the cover 130 is welded to the plastic shell 110. In this way, it should be noted that in this embodiment, the cover 130 and the plastic shell 110 are made of high temperature resistant materials, and the contact part of the cover 130 and the plastic shell 110 is connected by ultrasonic welding. Ultrasonic welding is usually used for plastic welding. It completely replaces the traditional industry of bonding with glue. In the ultrasonic welding process, there are no connecting bolts, nails, buckles, welding materials or adhesives and other materials are combined together. It is faster than traditional adhesives or glues, and the drying time is also very fast. The welding process can be easily automated and can be easily customized to adapt to the specific specifications of various types of products to be welded.

[0033] For further information, see Figure 1 One end of the brush 122 is provided with a plurality of contact protrusions 1221, and each contact protrusion 1221 is used to contact the printed carbon film 111. Thus, it should be noted that the existence of the contact protrusions 1221 enables the brush 122 to contact the printed carbon film 111 more stably.

[0034] For further information, see Figure 2 The plastic shell 110 is provided with a positioning terminal 113 at the side wall, and the positioning terminal 113 is provided with a connecting hole 1131. In this way, it should be noted that the positioning terminal 113 plays a role of installation, and the assembler can install the miniature potentiometer 10 inside the external device through the connecting hole 1131. In this embodiment, the positioning terminals 113 are axially symmetrically distributed with respect to the central axis of the plastic shell 110. The axially symmetrical distribution can improve the installation stability of the miniature potentiometer 10.

[0035] For further information, see Figure 1 The cover 130 is provided with a window hole 131. The window hole 131 can expose a portion of the transfer sheet 121 to facilitate the operator to operate the miniature potentiometer 10, and can also improve the heat dissipation capacity of the miniature potentiometer 10.

[0036] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of the various embodiments have their own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily required for the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0037] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A miniature potentiometer, characterized in that: include: A plastic shell, wherein a printed carbon film is arranged inside the plastic shell, the plastic shell is provided with a three-terminal connector, the three-terminal connector is connected to the printed carbon film, the three-terminal connector is provided with a connecting hole, and the connecting hole is covered with copper foil; A variable resistor kit, the variable resistor kit comprising a transfer plate, a brush, an inner sealing ring and an outer sealing ring, the brush being riveted on the transfer plate, the inner sealing ring being sleeved on one end of the transfer plate, the outer sealing ring being sleeved on the other end of the transfer plate, the transfer plate being arranged in the plastic shell, and the transfer plate being rotatable relative to the plastic shell; and The cover body is disposed on the plastic shell, and the cover body and the plastic shell are welded.

2. The miniature potentiometer according to claim 1, characterized in that: One end of the brush is provided with a plurality of contact protrusions, each of which is used to contact the printed carbon film.

3. The miniature potentiometer according to claim 1, characterized in that: The plastic shell is provided with a positioning terminal at the side wall position, and the positioning terminal is provided with a connecting hole.

4. The miniature potentiometer according to claim 3, characterized in that: The positioning terminals are distributed in an axisymmetric manner about the central axis of the plastic shell.

5. The miniature potentiometer according to claim 1, characterized in that: The cover body is provided with a window hole.

6. The miniature potentiometer according to claim 1, characterized in that: The printed carbon film is in a ring shape.

7. The miniature potentiometer according to claim 1, characterized in that: The inner sealing ring and the outer sealing ring both have an "O"-shaped structure.

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