Circuit of film platinum resistor

Abstract

The utility model discloses a circuit of a film platinum resistor. The circuit comprises a main sensitive resistor area, a resistance adjusting area and an electrode area, the resistance adjusting area comprises a long line coarse adjusting area, a short line fine adjusting area and a thick line fine adjusting area; a plurality of resistance-adjusting resistor strips are respectively arranged in the long-line coarse-adjusting area and the short-line fine-adjusting area; the thick line fine adjustment area is used for adjusting resistance by adjusting the length, the cutting position and the width of a laser stroke; the main sensitive resistance area and the resistance adjusting area are respectively connected with the electrode area; the electrode area is composed of two electrodes and used for lead welding to achieve resistance output. According to the utility model, different structures and different resistance adjusting precision are adopted for different resistance adjusting areas, so that graded resistance adjusting is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature sensors, in particular to a circuit of a thin-film platinum resistor. Background Art

[0002] Thin-film platinum resistors are designed and developed based on the principle that resistance increases with the increase of test temperature. The grade is mainly determined by the resistance error at zero degrees, and the resistance error of grade A is ±0.06%. Among them, the resistance value is adjusted by laser adjustment. The resistance adjustment path of the laser on the platinum resistor is determined according to the resistance adjustment structure, and the resistance adjustment accuracy is also related to the resistance adjustment structure. However, an overly complex resistance adjustment structure will not only reduce the resistance adjustment efficiency, but also increase the structure size, which will seriously affect the production efficiency and output of platinum resistors, while an overly simple resistance adjustment structure will affect the resistance adjustment accuracy. Therefore, it is crucial to design a relatively simple resistance adjustment structure that can achieve high precision for platinum resistor production. By laser adjustment of the resistance adjustment area, a platinum resistor with high consistency can be obtained, thereby improving the product qualification rate. Utility Model Content

[0003] Purpose of the utility model: In order to solve the problems existing in the prior art, the utility model provides a circuit of a thin film platinum resistor, which can achieve high-precision graded resistance adjustment and improve the qualified rate of platinum resistor products.

[0004] Technical solution: A circuit of a thin film platinum resistor includes a main sensitive resistor area, a resistance adjustment area and an electrode area;

[0005] The resistance adjustment area includes a long line rough adjustment area, a short line fine adjustment area and a thick line fine adjustment area; a plurality of resistance adjustment resistors are respectively arranged in the long line rough adjustment area and the short line fine adjustment area; the thick line fine adjustment area realizes resistance adjustment by adjusting the length of the laser stroke, the cutting position and the width;

[0006] The main sensitive resistance area and the resistance adjustment area are connected to the electrode area respectively;

[0007] The electrode area is composed of two electrodes and is used for lead welding to achieve resistance output.

[0008] Furthermore, the main sensitive resistor area, the resistance adjustment area and the electrode area are all arranged on a ceramic substrate.

[0009] Furthermore, the electrode area is composed of two square electrodes, one electrode is connected in series with the main sensitive resistance area, and the other electrode is connected in series with the resistance strip in the thick line fine adjustment area.

[0010] Further, the long line rough adjustment area includes a first body resistor bar, a first short-circuit resistor bar and a first resistance-adjusting resistor bar, a plurality of groups of first body resistor bars are arranged in parallel and connected in series, and two ends of the first short-circuit resistor bar are respectively connected to the first body resistor bar and the first resistance-adjusting resistor bar;

[0011] The short-circuit line fine-tuning area includes a second body resistor bar, a second short-circuit resistor bar and a second resistance-adjusting resistor bar. Multiple groups of second body resistor bars are arranged in parallel and connected in series. The two ends of the second short-circuit resistor bar are respectively connected to the second body resistor bar and the second resistance-adjusting resistor bar.

[0012] Furthermore, the resistance adjustment resistors in the resistance adjustment area are divided into a long-line coarse-adjustment resistance area, a short-line fine-adjustment resistance area and a thick-line precise-adjustment resistance area, and graded resistance adjustment is achieved by changing the length and structure of the lines between different resistance adjustment areas.

[0013] Furthermore, the main sensitive resistor in the main sensitive resistor area is connected in series with the electrode and the trimming resistor, and the resistance of the main sensitive resistor is related to the line length, line width, material thickness and material resistivity.

[0014] The beneficial effects of the utility model are as follows:

[0015] The resistance adjustment structure of the utility model is simple, which can not only effectively reduce the overall structure of the platinum resistor, thereby increasing the number of structures on a ceramic substrate of fixed size and improving production, but also reduce the resistance adjustment path, which can improve the resistance adjustment efficiency, and the resistance adjustment accuracy reaches 0.002Ω, which is far lower than the standard error value of Class A, ensuring the qualified rate of the platinum resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] The figure numbers are as follows: 1-main sensitive resistance area, 21-long line coarse adjustment area, 22-short line fine adjustment area, 23-coarse line fine adjustment area, 211-first main resistance bar, 212-first short circuit resistance bar, 213-first resistance adjustment resistance bar, 221-second main resistance bar, 222-second short circuit resistance bar, 223-second resistance adjustment resistance bar, 3-electrode area. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] like Figure 1 As shown, a circuit of a thin film platinum resistor in this embodiment includes a main sensitive resistor area 1, a resistance adjustment area and an electrode area 3;

[0020] The resistance adjustment area includes a long-line rough adjustment area 21, a short-line fine adjustment area 22 and a thick-line fine adjustment area 23, wherein the short-line fine adjustment area 22 and the thick-line fine adjustment area 23 respectively include a body resistor bar, a short-circuit resistor bar and a resistance adjustment resistor bar. In the long-line rough adjustment area 21, a plurality of first body resistor bars 211 are arranged in parallel and connected in series to the first short-circuit resistor bar 212 and the first resistance adjustment resistor bar 213; by interrupting the first resistance adjustment resistor bar 213, the corresponding first body resistor bar 211 is connected to the loop to increase the total resistance value, and by setting the first body resistor bars 211 with different line lengths and different structures, graded resistance adjustment can be achieved; the thick-line fine adjustment area 23 accurately adjusts the resistance by controlling the length of the cutting stroke, thereby achieving the resistance adjustment accuracy of the total resistance value.

[0021] The main sensitive resistor area 1 is directly connected to the electrode area 3 and the long line coarse adjustment area 21 respectively, the long line coarse adjustment area 21 and the short line fine adjustment area 22 are respectively connected to the coarse line fine adjustment area 23, and the coarse line fine adjustment area 23 is connected to the electrode area 3;

[0022] In the short-line rough adjustment area 22 , multiple second body resistor bars 221 are arranged in parallel and connected in series to the second short-circuit resistor bar 222 and the second resistance-adjusting resistor bar 223 ; the corresponding second body resistor bar 221 is connected to the loop by interrupting the second resistance-adjusting resistor bar 223 .

[0023] In this embodiment, the main sensitive resistor region 1 , the resistance adjustment region and the electrode region 3 are all arranged on the ceramic substrate and are integrally formed.

[0024] In this embodiment, by controlling the line widths of the body resistor strips, the short-circuit resistor strips and the resistance-adjusting resistor strips in the main sensitive resistor region 1 and the resistance-adjusting region, the variation range of the total resistance value can be controlled.

[0025] The specific implementation process is as follows:

[0026] In this embodiment, the resistance adjustment area is divided into three levels of resistance adjustment, the first level resistance adjustment is a long line coarse adjustment area 21, the second level resistance adjustment is a short line fine adjustment area 22 and the third level resistance adjustment is a thick line fine adjustment area 23; laser resistance adjustment is used to cut the resistance adjustment resistor strips so as to connect the main resistance to the overall circuit to achieve resistance adjustment, the first level resistance adjustment has the highest resistance change, the third level resistance change has the lowest resistance change, and the resistance change in each level resistance adjustment is uniform and consistent, for example: in the first level resistance adjustment long line coarse adjustment area 21, each time a first resistance adjustment resistor strip 213 is cut, the total resistance value increases by 20Ω; in the second level short line fine adjustment area 22, each time a second resistance adjustment resistor strip 223 is cut, the total resistance value increases by 2Ω; in the third level resistance adjustment thick line fine adjustment area 23, the cutting step is 20μm, and the total resistance value increases by 0.002Ω.

[0027] The total resistance can be adjusted to 90% of the target value through the first-level resistance adjustment, the total resistance can be adjusted to 99% of the target value through the second-level resistance adjustment, and the total resistance can be adjusted to 100% of the target value through the third-level resistance adjustment.

[0028] To sum up, the above is only the technical solution of the utility model rather than a limitation, and the scope of the claims advocated by the utility model is not limited thereto. Improvements and modifications made to the utility model by those skilled in the art based on the disclosure of the utility model should be within the protection scope of the utility model.

Claims

1. A circuit of a thin film platinum resistor, characterized in that: It includes a main sensitive resistance area, a resistance adjustment area and an electrode area; The resistance adjustment area includes a long line rough adjustment area, a short line fine adjustment area and a thick line fine adjustment area; a plurality of resistance adjustment resistors are respectively arranged in the long line rough adjustment area and the short line fine adjustment area; the thick line fine adjustment area realizes resistance adjustment by adjusting the length of the laser stroke, the cutting position and the width; The main sensitive resistance area and the resistance adjustment area are connected to the electrode area respectively; The electrode area is composed of two electrodes and is used for lead welding to achieve resistance output.

2. The circuit of the thin film platinum resistor according to claim 1, characterized in that: The main sensitive resistance area, the resistance adjustment area and the electrode area are all arranged on a ceramic substrate.

3. The circuit of the thin film platinum resistor according to claim 1, characterized in that: The electrode area is composed of two square electrodes, one electrode is connected in series with the main sensitive resistance area, and the other electrode is connected in series with the resistance strip of the thick line fine adjustment area.

4. The circuit of the thin film platinum resistor according to claim 1, characterized in that: The long line rough adjustment area includes a first body resistor bar, a first short-circuit resistor bar and a first resistance-adjusting resistor bar, a plurality of groups of first body resistor bars are arranged in parallel and connected in series, and two ends of the first short-circuit resistor bar are respectively connected to the first body resistor bar and the first resistance-adjusting resistor bar; The short-circuit line fine-tuning area includes a second body resistor bar, a second short-circuit resistor bar and a second resistance-adjusting resistor bar. Multiple groups of second body resistor bars are arranged in parallel and connected in series. The two ends of the second short-circuit resistor bar are respectively connected to the second body resistor bar and the second resistance-adjusting resistor bar.

5. The circuit of the thin film platinum resistor according to claim 1, characterized in that: The resistance adjustment resistors in the resistance adjustment area are divided into a long-line coarse-adjustment resistance area, a short-line fine-adjustment resistance area and a thick-line precise-adjustment resistance area. Graded resistance adjustment is achieved by changing the length and structure of the lines between different resistance adjustment areas.

6. The circuit of the thin film platinum resistor according to claim 5, characterized in that: The main sensitive resistor in the main sensitive resistor area is connected in series with the electrode and the adjusting resistor. The resistance value of the main sensitive resistor is related to the line length, line width, material thickness and material resistivity.

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