CN201725646U - Potentiometer - Google Patents

Abstract

The utility model relates to an electronic component specifically discloses a potentiometer, including a circuit board, rotating device and resistance circuit, the resistance circuit comprises two at least discrete resistor series connections, discrete resistor is the metal film resistance of predetermined resistance value. Adopt the utility model discloses the structure can make the resistance of potentiometre receive temperature, humidity influence change littleer, generally no longer than 1%. has strengthened the moisture resistance and the resistance stability of potentiometre promptly greatly.

Description

A kind of potentiometer

Technical field

The utility model relates to a kind of electronic component, is specifically related to a kind of potentiometer.

Background technology

Potentiometer is a kind of adjustable electronic component, and it is rotated by a resistive element and one or sliding system is formed.When adding a voltage between two fixed contacts of resistive element, by rotating or sliding system changes the position of contact on resistive element, between moving contact and fixed contact, just can obtain one and become the voltage that necessarily concerns with the moving contact position.Potentiometer divides wire-wound, carbon membrane, real core formula potentiometer by material; By output with input voltage than dividing linear potentiometer (linear), functional potentiometer (curved relation) with the relation of the anglec of rotation.Its major parameter is resistance, tolerance, rated power.Potentiometer is widely used in electronic equipment, and instrument and meter is done volume control and used in sound equipment and receiver.

With present very general carbon composition film potentiometer: its resistive element is with the carbon black through grinding, graphite, and materials such as quartz are coated on matrix surface and form, and this technology is simple, is present most widely used potentiometer.

The carbon composition film potentiometer resistance be subjected to environmental condition (temperature. humidity) influence change greatly, promptly moisture resistivity and resistance stability are poor. its resistance temperature influence is usually :-20 ℃～80 ℃, change in resistance is 5%; Be subjected to effects of humidity change to be: 10～90, change in resistance surpasses 10%. simultaneously, according to different situations, also have as current noise big, non-linear shortcoming such as big.

Carbon film resistor is with organic bond carbon ink, graphite and inserts to be made into suspension to be coated on the insulating body, forms through heated polymerizable.Hydrocarbon gas decomposes in high temperature and vacuum, and carbon laydown forms one deck crystallization carbon film on porcelain rod or porcelain tube.Change carbon film thickness and change the length of carbon film, can obtain different resistances with the method for cutting.The fixed carbon resister cost is lower, and electrical property and less stable generally are unsuitable for doing general purpose resistor.But because it makes the film of high value easily, so mainly as the high resistant high voltage resistor.

Metal film resistor is made resistance material with specialty metal or alloy exactly, with the method for vacuum evaporation or sputter, forms the resistor of resistive layer basically at pottery or glass.This quasi-resistance device generally adopts vacuum evaporation technology to make, and promptly adds thermalloy in a vacuum, and the alloy evaporation makes porcelain rod surface form one deck conductive metal film.Cutting and change thickness of metal film can be controlled resistance.Electrical properties such as its thermal endurance, noise potential, temperature coefficient, voltage coefficient are better than carbon film resistor.The manufacturing process of metal film resistor is more flexible, not only can adjust its material composition and thicknesses of layers, also can adjust resistance by cutting, thus can make functional, the resistor of Standard resistance range broad.This resistance is compared with fixed carbon resister, and volume is little, noise is low, good stability.

The utility model content

Change problem greatly for the resistance that solves existing potentiometer is subjected to temperature, humidity effect, the potentiometer that provides a kind of resistance more stable is provided the purpose of this utility model.

For achieving the above object, the technical solution of the utility model is:

A kind of potentiometer comprises a wiring board, tumbler and resistance circuit, and described tumbler and described resistance circuit are arranged on the described wiring board; Described wiring board is provided with a moving contact and two fixed contacts; Described fixed contact is electrically connected with the two ends of described resistance circuit; At least two discrete resistors series connection of described resistive conductor route constitute, and described discrete resistors is the metalfilmresistor that pre-determines resistance value; Be provided with electric potential contact between described per two series connection discrete resistors, described moving contact is electrically connected by the described potential nodes of described tumbler and one of them under normal conditions.

Described potentiometer is provided with at least one Copper Foil piece independent of each other at the upper surface of its wiring board; Described resistance circuit is arranged on the described wiring board, specifically: described discrete resistors is arranged at the lower surface of described wiring board, and described moving contact, fixed contact and electric potential contact are electrically connected with the described Copper Foil piece of a upper surface respectively.

Preferably, described discrete resistors is SMD resistance.

The utility model is transformed into a plurality of independently discrete resistors series connection with the original whole resistive element of the resistive conductor route in the potentiometer and constitutes, each discrete resistors is separate, can not make the resistance of whole resistance circuit that bigger variation take place because certain part is affected by environment, thus the voltage of influence and the output of change potentiometer; Simultaneously, the utility model adopts the better alternative former fixed carbon resister of metalfilmresistor of stability, makes the stability of resistance circuit better

The beneficial effects of the utility model are:

Adopt the utility model structure, it is littler to make the resistance of potentiometer changed by temperature, humidity effect, generally is no more than 1%., has promptly strengthened the moisture resistivity and the resistance stability of potentiometer greatly.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, does not constitute to improper qualification of the present utility model, in the accompanying drawings:

Fig. 1 is the utility model wiring board Facad structure schematic diagram;

Fig. 2 is the utility model wiring board reverse side structural representation;

Fig. 3 is the utility model circuit principle structure schematic diagram.

Among the figure:

1,resistance circuit 11, electric potential contact

2,wiring board 21, first fixed contact

22, second fixedcontact 23, moving contact

3, tumbler

Embodiment

Describe the utility model in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the utility model in this illustrative examples of the present utility model and explanation, but not as to qualification of the present utility model.

Fig. 1,2 is the utility model wiring board positive and negative structural representations; As shown in Figure 2, comprise wiring board 2 and be arranged at resistance circuit 1, tumbler (not shown) on the wiring board 2, described tumbler is existing common structure, such as: at the center is in a rotating shaft, in rotating shaft, connect a sheet metal that rotates with rotating shaft, make to be communicated with different circuit nodes on the resistance circuit 1 constantly in difference; Described resistance circuit 1 comprises the discrete resistors that is cascaded: R1, R2, R3, R4, R5, R6, R7, R8, R9, and the resistance of described each discrete resistors all is 1K ohm; In order to make that littler described each discrete resistors of volume of potentiometer all is SMD resistance; Little in order to make that resistance circuit 1 is influenced by humiture, described each discrete resistors all is a metalfilmresistor.Need to prove that the number and the resistance of discrete resistors are not limited thereto in the described resistance circuit 1, can also be other varying numbers, the resistance of described discrete resistors also can be selected other resistances for use according to the application of the potentiometer of reality.

As shown in Figure 1, be provided with 11 Copper Foil pieces independent of each other at the upper surface of described wiring board 2, wherein three is movingcontact 23 and two fixed contacts: first fixedcontact 21, second fixedcontact 22, and all the other 8 all is electricpotential contact 11; As shown in Figure 2, described discrete resistors: R1, R2, R3, R4, R5, R6, R7, R8, R9 are arranged at the lower surface of wiring board 2, be provided with electricpotential contact 11 between wherein per two series connection discrete resistors, described movingcontact 23, first fixedcontact 21, second fixedcontact 22 and electricpotential contact 11 are electrically connected with the described Copper Foil piece of a upper surface respectively.

Fig. 3 is the utility model circuit principle structure schematic diagram, and as shown in Figure 3, described first fixedcontact 21, second fixedcontact 22 are electrically connected with the two ends of described resistance circuit 1; Resistance circuit 1 by N discrete resistors: R1, R2, R3, R4,,,,, Rn, N=9 in the present embodiment, be provided with electricpotential contact 11 between wherein per two series connection discrete resistors, described movingcontact 23 is electrically connected by the describedpotential nodes 11 of described tumbler 3 and one of them under normal conditions.When between first fixedcontact 21 and second fixedcontact 22, loading a voltage, change moving contacts by tumbler 3 and is electrically connected, between moving contact and fixed contact, just can obtain one and become the voltage that necessarily concerns with the moving contact position with different potentials contact 11 in the resistance circuit 1.

The utility model is transformed into a plurality of independently discrete resistors series connection with the original whole resistive element of the resistive conductor route in the potentiometer and constitutes, each discrete resistors is separate, can not make the resistance of whole resistance circuit that bigger variation take place because certain part is affected by environment, thus the voltage of influence and the output of change potentiometer; Simultaneously, the utility model adopts the better alternative former fixed carbon resister of metalfilmresistor of stability, makes the stability of resistance circuit better

Adopt the utility model structure, it is littler to make the resistance of potentiometer changed by temperature, humidity effect, generally is no more than 1%., has promptly strengthened the moisture resistivity and the resistance stability of potentiometer greatly.

More than technical scheme that the utility model embodiment is provided be described in detail, used specific case herein principle and the execution mode of the utility model embodiment are set forth, the explanation of above embodiment only is applicable to the principle that helps to understand the utility model embodiment; Simultaneously, for one of ordinary skill in the art, according to the utility model embodiment, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as restriction of the present utility model.

Claims (3)

Translated fromChinese

1.一种电位器，包括一线路板、转动装置、以及电阻线路，所述转动装置与所述电阻线路设置于所述线路板上；在所述线路板上设置有一动触点、以及两个固定触点；所述固定触点与所述电阻线路的两端电连接；其特征在于：1. a potentiometer, comprising a circuit board, rotating device and resistance circuit, described rotating device and described resistance circuit are arranged on described circuit board; On described circuit board, be provided with a movable contact, and two a fixed contact; the fixed contact is electrically connected to the two ends of the resistance circuit; it is characterized in that:所述电阻线路由至少两个分立电阻串联构成，所述分立电阻为预先确定电阻值的金属膜电阻；The resistance line is composed of at least two discrete resistors connected in series, and the discrete resistors are metal film resistors with predetermined resistance values;在所述每两个串联分立电阻之间设置有电位接点，所述动触点在常态下通过所述转动装置与其中一个所述电位节点电连接。A potential contact is arranged between each two series discrete resistors, and the movable contact is electrically connected to one of the potential nodes through the rotating device under normal conditions.2.根据权利要求1所述的电位器，其特征在于：2. The potentiometer according to claim 1, characterized in that:在所述线路板的上表面设置有至少一块彼此独立的铜箔块；At least one copper foil block independent of each other is arranged on the upper surface of the circuit board;所述电阻线路设置于所述线路板上，具体是：The resistance circuit is set on the circuit board, specifically:所述分立电阻设置于所述线路板的下表面，所述动触点、固定触点、以及电位接点分别与一块上表面的所述铜箔块电连接。The discrete resistor is arranged on the lower surface of the circuit board, and the movable contact, the fixed contact, and the potential contact are respectively electrically connected to the copper foil block on the upper surface.3.根据权利要求1所述的电位器，其特征在于：3. The potentiometer according to claim 1, characterized in that:所述分立电阻为贴片式电阻。The discrete resistors are chip resistors.

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