CN213519419U - Voltage-dividing resistor for linear displacement sensor or potentiometer - Google Patents
Voltage-dividing resistor for linear displacement sensor or potentiometer Download PDFInfo
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- CN213519419U CN213519419U CN202022517393.7U CN202022517393U CN213519419U CN 213519419 U CN213519419 U CN 213519419U CN 202022517393 U CN202022517393 U CN 202022517393U CN 213519419 U CN213519419 U CN 213519419U
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Abstract
The utility model discloses a partial pressure formula resistive element for linear displacement sensor or potentiometre, including the plastic substrate, the coating has the resistive film of the busbar that is parallel to each other and bar on the plastic substrate, the resistive film includes first resistive film and the second resistive film of the electrically conductive connection of coaxial direction and end to end series connection, the resistance of first resistive film with the resistance of second resistive film is different. The utility model discloses a with resistive film design for the first resistive film and the second resistive film of mutual series connection, utilize the partial pressure function of series resistance film to carry out the partial pressure to brush output voltage, make its output voltage satisfy the actual demand of using the scene, specific partial pressure proportion can be realized through the resistance ratio that changes between two resistive films.
Description
Technical Field
The present invention relates to a resistor for linear displacement signal feedback, and more particularly to a voltage-dividing resistor for a linear displacement sensor or a potentiometer.
Background
With the miniaturization and informatization development of products, electric servo mechanisms occupy the main position in more and more servo control systems, and position feedback linear displacement sensors or potentiometers matched with the electric servo mechanisms are also widely used. Among them, the conductive plastic linear displacement sensor or potentiometer is favored because of its good temperature characteristic, long wear-resisting life, excellent output precision characteristic, stable and reliable performance, simple use and convenient installation.
The conductive plastic linear displacement sensor or potentiometer is connected with the electric servo mechanism through a pull rod (or a connecting handle), the other end of the pull rod (or the connecting handle) is connected with a sliding block provided with an electric brush, and the electric servo mechanism drives the pull rod (or the connecting handle) to do reciprocating linear motion, so that the sliding block in the sensor or the potentiometer drives the electric brush to do reciprocating linear motion on the resistor body. In the follow-up process of the electric brush, different voltage values are output, and finally the position feedback effect is achieved.
A conventional resistor body for a linear displacement sensor or potentiometer has a structure as shown in fig. 1, in which a conductive strip 2 and a resistive strip 3 are printed on a plastic substrate 1 in parallel with each other, and in operation, two brushes (not shown) slide in contact with the conductive strip 2 and the resistive strip 3, respectively, and the brush contacting the resistive strip 3 outputs a varying electrical signal and transmits the signal to a connection terminal through another brush and the conductive strip 2. The resistance film 3 is formed by trimming the printed resistance paste, and the independent linearity of the resistance film needs to meet the customer requirement (generally between-0.5% to + 0.5%).
The output voltage of the variable electrical signal of the traditional resistor body is completely in linear corresponding relation with the moving distance of the electric brush, when the electric brush moves to a specific position, the output variable electrical signal is a certain value corresponding to the electric brush, the corresponding relation cannot be changed, the characteristic meets the use requirement in most application scenes, but the use requirement cannot be met in special application scenes, for example, a voltmeter displaying the output voltage can only display the voltage value (namely, the required voltage value) at the specific position in practical application, but under the condition that the length of the plastic substrate 1 cannot be changed, the voltage value output according to the linear relation exceeds the required voltage value at the position, and the problem that the traditional resistor body cannot meet the use requirement can be caused.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide a voltage-dividing resistor for a linear displacement sensor or a potentiometer, which can change an output voltage as required in order to solve the above-mentioned problems.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
a voltage-dividing resistor for a linear displacement sensor or a potentiometer comprises a plastic substrate, wherein a conductive bar and a strip-shaped resistive film are coated on the plastic substrate, the resistive film comprises a first resistive film and a second resistive film which are coaxially and serially connected in a conducting mode, and the resistance of the first resistive film is different from that of the second resistive film.
Preferably, in order to facilitate better conductive connection between the first resistive film and the second resistive film, a gap is provided between the first resistive film and the second resistive film and the first resistive film and the second resistive film are connected through a conductive material.
Preferably, in order to achieve as zero resistance conductive connection as possible between the first resistive film and the second resistive film, the conductive material is silver paste coated on the plastic substrate.
Preferably, in order to make the moving distance of the brush on the first resistive film longer to meet the use requirement, the length of the first resistive film is 2-5 times of the length of the second resistive film.
The beneficial effects of the utility model reside in that:
the utility model discloses a with resistive film design for the first resistive film and the second resistive film of mutual series connection, utilize the partial pressure function of series resistance film to carry out the partial pressure to brush output voltage, make its output voltage satisfy the actual demand of using the scene, specific partial pressure proportion can be realized through the resistance ratio that changes between two resistive films.
Drawings
Fig. 1 is a schematic front view of a conventional resistor body for a linear displacement sensor or a potentiometer;
fig. 2 is a schematic view of the structure of the voltage dividing resistor for a linear displacement sensor or a potentiometer according to the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 2, the voltage-dividing resistor body for the linear displacement sensor or the potentiometer comprises a plastic substrate 1, a conductive strip 2 and a bar-shaped resistive film are coated on the plastic substrate 1, the resistive film comprises a first resistive film 4 and a second resistive film 6 which are in conductive connection in a coaxial and head-tail series connection, the resistance of the first resistive film 4 is different from that of the second resistive film 6, a gap is arranged between the first resistive film 4 and the second resistive film 6 and is connected with the gap through a silver paste 5 coated on the plastic substrate 1, and the length of the first resistive film 4 is 2-5 times, namely about 3 times, of that of the second resistive film 6.
In the above structure, the implementation manner in which the resistance of the first resistive film 4 is different from the resistance of the second resistive film 6 is mainly implemented by performing different linear trimming on the resistive films, which is a conventional technique, and the lengths and widths of the first resistive film 4 and the second resistive film 6 are changed according to actual needs, and are also used as one of means for changing the corresponding resistive films.
The ratio between the resistance of the first resistive film 4 and the resistance of the second resistive film 6 is designed according to the brush movement distance and the required output voltage, and specifically, assuming that the resistance of the first resistive film 4 is R1, the resistance of the second resistive film 6 is R2, the total input voltage is U1, and the voltage across the first resistive film 4 is U1L1The voltage across the second resistance film 6 is UL2The display voltage required for the brush to move to the terminal of the first resistive film 4 is U3, wherein U1, U3 and R1 are preset known parameters, R2 is a parameter to be calculated, U is UL1And UL2To calculate the parameters that can be obtained after calculating R2, R2 can be calculated according to the following formula:
if the obtained R2 has difficulty in implementation, R1 can be changed, and finally R1 and R2 are both easy to implement.
In practical application, assuming that the corresponding moving distance of the brush is L and the output voltage is U when the brush moves to any position on the first resistive film 4, U and L are always in a linear relationship and U is always smaller than U3, so that the signal feedback function of the sensor or the potentiometer can be realized while the actual voltage display requirement is met.
The above-mentioned embodiment is only the preferred embodiment of the present invention, and is not to the limitation of the technical solution of the present invention, as long as the technical solution can be realized on the basis of the above-mentioned embodiment without creative work, all should be regarded as falling into the protection scope of the right of the present invention.
Claims (4)
1. A voltage-dividing resistor body for a linear displacement sensor or a potentiometer comprises a plastic substrate, wherein a conductive strip and a strip-shaped resistive film are coated on the plastic substrate in parallel, and the voltage-dividing resistor body is characterized in that: the resistance film comprises a first resistance film and a second resistance film which are coaxially and end-to-end connected in series in a conductive mode, and the resistance of the first resistance film is different from that of the second resistance film.
2. The voltage-dividing resistor body for a linear displacement sensor or potentiometer according to claim 1, wherein: a gap is formed between the first resistive film and the second resistive film and is connected through a conductive material.
3. The voltage-dividing resistor body for a linear displacement sensor or potentiometer according to claim 2, wherein: the conductive material is silver paste coated on the plastic substrate.
4. The voltage-dividing resistor body for a linear displacement sensor or potentiometer according to claim 1, 2 or 3, wherein: the length of the first resistive film is 2-5 times the length of the second resistive film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022517393.7U CN213519419U (en) | 2020-11-04 | 2020-11-04 | Voltage-dividing resistor for linear displacement sensor or potentiometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022517393.7U CN213519419U (en) | 2020-11-04 | 2020-11-04 | Voltage-dividing resistor for linear displacement sensor or potentiometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213519419U true CN213519419U (en) | 2021-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022517393.7U Active CN213519419U (en) | 2020-11-04 | 2020-11-04 | Voltage-dividing resistor for linear displacement sensor or potentiometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213519419U (en) |
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2020
- 2020-11-04 CN CN202022517393.7U patent/CN213519419U/en active Active
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