High-precision linear arc-shaped carbon membrane structure

Abstract

The utility model provides a high-precision linear arc-shaped carbon film structure, which comprises an insulating substrate, a first conductive metal circuit layer, a second conductive metal circuit layer, a third conductive metal circuit layer, a fourth conductive metal circuit layer, a fifth conductive metal circuit layer, a sixth conductive metal circuit layer, a first carbon film resistance layer and a second carbon film resistance layer, the second conductive metal circuit layer is connected with the sixth conductive metal circuit layer through the first carbon film resistance layer, and the third conductive metal circuit layer is connected with the fifth conductive metal circuit layer through the second carbon film resistance layer; the first carbon film resistance layer and the second carbon film resistance layer are arranged to be arc-shaped; the first carbon film resistor layer and the second carbon film resistor layer are provided with the trimming edge sections along one side or / and two sides of the arc length direction through laser trimming, so that the resistance consistency is improved, the current consistency is improved, and the product yield is also greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon diaphragms, in particular to a high-precision linear arc-shaped carbon diaphragm structure. Background Art

[0002] The Chinese authorization announcement number is CN 211907124 U, and the authorization announcement date is November 10, 2020. It discloses a carbon film sheet of a rocker potentiometer with accurate reset, including an insulating substrate, on which a first welding end, a second welding end and a third welding end are provided, the first welding end is connected to a first conductive copper layer, the second welding end is connected to a second conductive copper layer, and the third welding end is connected to a third conductive copper layer; a slide rail adjustment module is provided between the second conductive copper layer and the third conductive copper layer, and a distance is provided between the slide rail adjustment module and the second conductive copper layer and the third conductive copper layer respectively; the slide rail adjustment module includes a number of equally spaced contact copper bars, all of which are connected to the same carbon film resistor layer, and the two ends of the carbon film resistor layer are respectively connected to the first conductive copper layer and the second conductive copper layer. The utility model has a large number of equally spaced contact copper bars, which can effectively reduce the reset error. In addition, the carbon film resistor layer is indirectly in contact with the brush through the slide rail adjustment module, and the carbon film sheet has a long service life. The defects of this prior art are: in the daily production process, due to the influence of factors such as material, ink model, screen, scraper, baking process, etc., the printed carbon film lacks consistency in resistance, which directly affects the consistency of current. For some products with high requirements for resistance consistency, such as military products or high-end products, the yield of products with conventional structures may not even exceed 5%. In view of this situation, improvement is urgently needed. Utility Model Content

[0003] In view of the above problems, the utility model provides a high-precision linear arc-shaped carbon film structure, which improves the consistency of resistance by setting a laser-engraved edge segment, thereby improving the consistency of current and greatly improving product yield.

[0004] To achieve the above-mentioned purpose, the utility model solves the problem through the following technical solutions: a high-precision linear arc-shaped carbon film structure, comprising an insulating substrate, and also comprising a first conductive metal circuit layer, a second conductive metal circuit layer, a third conductive metal circuit layer, a fourth conductive metal circuit layer, a fifth conductive metal circuit layer, a sixth conductive metal circuit layer, a first carbon film resistor layer, and a second carbon film resistor layer, wherein the second conductive metal circuit layer is connected to the sixth conductive metal circuit layer through the first carbon film resistor layer, and the third conductive metal circuit layer is connected to the fifth conductive metal circuit layer through the second carbon film resistor layer; the first carbon film resistor layer and the second carbon film resistor layer are both configured as arcs; the first conductive metal circuit layer, the second conductive metal circuit layer, the third conductive metal circuit layer, the fourth conductive metal circuit layer, the fifth conductive metal circuit layer, and the sixth conductive metal circuit layer are configured as arcs with a coaxial center on one side corresponding to the first carbon film resistor layer and the second carbon film resistor layer;

[0005] The first carbon film resistor layer and the second carbon film resistor layer are both provided with trimmed edge segments on one side or / both sides along the arc length direction thereof by laser trimming.

[0006] Preferably, a first trimmed edge segment is formed on a side of the first carbon film resistor layer close to the second conductive metal circuit layer and the sixth conductive metal circuit layer by laser trimming; the first trimmed edge segment is located within 5% of the effective length of both ends of the first carbon film resistor layer;

[0007] A second trimmed edge segment is formed on a side of the second carbon film resistor layer close to the third conductive metal circuit layer and the fifth conductive metal circuit layer by laser trimming; the second trimmed edge segment is located within 5% of the effective angle at both ends of the second carbon film resistor layer;

[0008] The widths of the first trimming edge segment and the second trimming edge segment are both set to 0.2 mm.

[0009] Preferably, the first carbon film resistor layer is formed with a first trimmed edge segment by laser trimming on two opposite sides of the second conductive metal circuit layer and the sixth conductive metal circuit layer; the first trimmed edge segment is located within 5% of the effective angle of two ends of the first carbon film resistor layer;

[0010] The second carbon film resistor layer is formed with a second trimmed edge segment by laser trimming on two opposite sides of the third conductive metal circuit layer and the fifth conductive metal circuit layer; the second trimmed edge segment is located within 5% of the effective angle at both ends of the second carbon film resistor layer;

[0011] The widths of the first trimming edge segment and the second trimming edge segment are both set to 0.2 mm.

[0012] Preferably, a third trimmed edge segment is formed by laser trimming on one side of the first carbon film resistor layer along the arc length direction and between the second conductive metal circuit layer and the sixth conductive metal circuit layer; the third trimmed edge segment is located within 90% of the effective angle of both ends of the first carbon film resistor layer;

[0013] A fourth trimmed edge segment is formed by laser trimming on one side of the second carbon film resistor layer along the arc length direction and between the third conductive metal circuit layer and the fifth conductive metal circuit layer; the fourth trimmed edge segment is located within 90% of the effective angle of both ends of the second carbon film resistor layer;

[0014] The widths of the third trimming edge segment and the fourth trimming edge segment are both set to 0.2 mm.

[0015] Preferably, the first carbon film resistor layer is provided with a third trimmed edge segment by laser trimming at two opposite sides along the arc length direction thereof and located between the second conductive metal circuit layer and the sixth conductive metal circuit layer; the third trimmed edge segment is located within 90% of the effective angle at both ends of the first carbon film resistor layer;

[0016] The second carbon film resistor layer is formed with fourth trimmed edge segments by laser trimming along opposite sides of the second carbon film resistor layer along the arc length direction and between the third conductive metal circuit layer and the fifth conductive metal circuit layer; the fourth trimmed edge segments are located within 90% of the effective angle at both ends of the second carbon film resistor layer;

[0017] The widths of the third trimming edge segment and the fourth trimming edge segment are both set to 0.2 mm.

[0018] Preferably, the first conductive metal circuit layer, the second conductive metal circuit layer, the third conductive metal circuit layer, the fourth conductive metal circuit layer, the fifth conductive metal circuit layer, and the sixth conductive metal circuit layer are all set to silver layers respectively.

[0019] Preferably, the thickness of the first conductive metal circuit layer, the second conductive metal circuit layer, the third conductive metal circuit layer, the fourth conductive metal circuit layer, the fifth conductive metal circuit layer and the sixth conductive metal circuit layer is set to 8-12 um.

[0020] Preferably, the thickness of the first carbon film resistor layer and the second carbon film resistor layer is set to 10-15 um.

[0021] The beneficial effects of the utility model are as follows: the first carbon film resistor layer and the second carbon film resistor layer are both provided with trimmed edge segments on one side or / and both sides along the arc length direction thereof by laser trimming, so that the resistance values ​​on both sides of the first carbon film resistor layer and the second carbon film resistor layer reach a consistent target resistance value, thereby improving the consistency of the current and greatly improving the product yield; in addition, since the resistance value can be adjusted by setting the trimmed edge segments, the requirements for the selection of the carbon film production substrate are reduced, so that the consistency of the resistance can be achieved without deliberately selecting the carbon film material. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural view of the first embodiment of the utility model.

[0023] Figure 2 This is a structural view of the second embodiment of the utility model (the insulating substrate is omitted).

[0024] The figures are marked as: insulating substrate 10, first conductive metal circuit layer 11, second conductive metal circuit layer 14, third conductive metal circuit layer 15, fourth conductive metal circuit layer 16, fifth conductive metal circuit layer 17, sixth conductive metal circuit layer 18, first carbon film resistor layer 12, first trimmed edge segment 13, second trimmed edge segment 20, second carbon film resistor layer 19, fourth trimmed edge segment 22, and third trimmed edge segment 21. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0026] The present embodiment provides a high-precision linear arc-shaped carbon film structure, including an insulating substrate 10, and also includes a first conductive metal circuit layer 11, a second conductive metal circuit layer 14, a third conductive metal circuit layer 15, a fourth conductive metal circuit layer 16, a fifth conductive metal circuit layer 17, a sixth conductive metal circuit layer 18, a first carbon film resistor layer 12, and a second carbon film resistor layer 19. The second conductive metal circuit layer 14 is connected to the sixth conductive metal circuit layer 18 through the first carbon film resistor layer 12, and the third conductive metal circuit layer 15 is connected to the fifth conductive metal circuit layer through the second carbon film resistor layer 19. The metal circuit layer 17 is connected; the first carbon film resistor layer 12 and the second carbon film resistor layer 19 are both set in an arc shape; the first conductive metal circuit layer 11, the second conductive metal circuit layer 14, the third conductive metal circuit layer 15, the fourth conductive metal circuit layer 16, the fifth conductive metal circuit layer 17, and the sixth conductive metal circuit layer 18 are set in a coaxial arc shape on one side corresponding to the first carbon film resistor layer 12 and the second carbon film resistor layer 19; the first carbon film resistor layer 12 and the second carbon film resistor layer 19 are formed with an engraved edge segment along one side or / both sides of the arc length direction by laser engraving. The resistance values ​​on both sides of the first carbon film resistor layer and the second carbon film resistor layer reach the same target resistance value, thereby improving the consistency of the current and greatly improving the product yield; in addition, since the resistance value can be adjusted by setting the engraved edge segment, the requirements for the selection of the carbon film production substrate are reduced, so that the consistency of the resistance can be achieved without deliberately selecting the carbon film material.

[0027] The first conductive metal circuit layer 11, the second conductive metal circuit layer 14, the third conductive metal circuit layer 15, the fourth conductive metal circuit layer 16, the fifth conductive metal circuit layer 17, and the sixth conductive metal circuit layer 18 are all set as silver layers. The thickness of the first conductive metal circuit layer 11, the second conductive metal circuit layer 14, the third conductive metal circuit layer 15, the fourth conductive metal circuit layer 16, the fifth conductive metal circuit layer 17, and the sixth conductive metal circuit layer 18 is set to 8-12um. The film thickness of the first carbon film resistor layer 12 and the second carbon film resistor layer 19 is set to 10-15um.

[0028] As a preferred embodiment, a first trimmed edge segment 13 is formed by laser etching on the side of the first carbon film resistor layer 12 close to the second conductive metal circuit layer 14 and the sixth conductive metal circuit layer 18; the first trimmed edge segment 13 is located within 5% of the effective length of the two ends of the first carbon film resistor layer 12; a second trimmed edge segment 20 is formed by laser etching on the side of the second carbon film resistor layer 19 close to the third conductive metal circuit layer 15 and the fifth conductive metal circuit layer 17; the second trimmed edge segment 20 is located within 5% of the effective angle of the two ends of the second carbon film resistor layer 19; the width of the first trimmed edge segment 13 and the second trimmed edge segment 20 are both set to 0.2 mm.

[0029] As a preferred embodiment, the first carbon film resistor layer 12 is provided with a third trimmed edge segment 21 by laser etching on opposite sides along the arc length direction thereof and between the second conductive metal circuit layer 14 and the sixth conductive metal circuit layer 18; the third trimmed edge segment 21 is located within 90% of the effective angle at both ends of the first carbon film resistor layer 12; the second carbon film resistor layer 19 is provided with a fourth trimmed edge segment 22 by laser etching on opposite sides along the arc length direction thereof and between the third conductive metal circuit layer 15 and the fifth conductive metal circuit layer 17; the fourth trimmed edge segment 22 is located within 90% of the effective angle at both ends of the second carbon film resistor layer 19; the widths of the third trimmed edge segment 21 and the fourth trimmed edge segment 22 are both set to 0.2 mm.

[0030] Reference Figure 1 As shown, in the first embodiment, the first carbon film resistor layer 12 is formed with a first trimmed edge segment 13 by laser etching on the opposite sides of the second conductive metal circuit layer 14 and the sixth conductive metal circuit layer 18; the first trimmed edge segment 13 is located within 5% of the effective angle at both ends of the first carbon film resistor layer 12, as shown at A in the figure; the second carbon film resistor layer 19 is formed with a second trimmed edge segment 20 by laser etching on the opposite sides of the third conductive metal circuit layer 15 and the fifth conductive metal circuit layer 17; the second trimmed edge segment 20 is located within 5% of the effective angle at both ends of the second carbon film resistor layer 19; the width of the first trimmed edge segment 13 and the second trimmed edge segment 20 are both set to 0.2 mm.

[0031] Reference Figure 2 As shown, in the second embodiment, the first carbon film resistor layer 12 is formed with a third trimmed edge segment 21 by laser etching along one side of its arc length direction and located between the second conductive metal circuit layer 14 and the sixth conductive metal circuit layer 18; the third trimmed edge segment 21 is located within 90% of the effective angle at both ends of the first carbon film resistor layer 12, as shown at B in the figure; the second carbon film resistor layer 19 is formed with a fourth trimmed edge segment 22 by laser etching along one side of its arc length direction and located between the third conductive metal circuit layer 15 and the fifth conductive metal circuit layer 17; the fourth trimmed edge segment 22 is located within 90% of the effective angle at both ends of the second carbon film resistor layer 19; the widths of the third trimmed edge segment 21 and the fourth trimmed edge segment 22 are both set to 0.2 mm.

[0032] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A high-precision linear arc-shaped carbon film structure, comprising an insulating substrate (10), and further comprising a first conductive metal circuit layer (11), a second conductive metal circuit layer (14), a third conductive metal circuit layer (15), a fourth conductive metal circuit layer (16), a fifth conductive metal circuit layer (17), a sixth conductive metal circuit layer (18), a first carbon film resistor layer (12), and a second carbon film resistor layer (19), wherein the second conductive metal circuit layer (14) is connected to the sixth conductive metal circuit layer (18) via the first carbon film resistor layer (12), and the third conductive metal circuit layer (15) connected to the fifth conductive metal circuit layer (17) through the second carbon film resistor layer (19); the first carbon film resistor layer (12) and the second carbon film resistor layer (19) are both configured to be arc-shaped; the first conductive metal circuit layer (11), the second conductive metal circuit layer (14), the third conductive metal circuit layer (15), the fourth conductive metal circuit layer (16), the fifth conductive metal circuit layer (17), and the sixth conductive metal circuit layer (18) are configured to be coaxially arranged on one side corresponding to the first carbon film resistor layer (12) and the second carbon film resistor layer (19); It is characterized in that The first carbon film resistor layer (12) and the second carbon film resistor layer (19) are both provided with trimmed edge segments on one side or / both sides along the arc length direction thereof by laser trimming.

2. A high-precision linear arc-shaped carbon diaphragm structure according to claim 1, characterized in that: A first trimmed edge segment (13) is formed by laser trimming on one side of the first carbon film resistor layer (12) facing the second conductive metal circuit layer (14) and the sixth conductive metal circuit layer (18); the first trimmed edge segment (13) is located within 5% of the effective length of both ends of the first carbon film resistor layer (12); A second trimmed edge segment (20) is formed by laser trimming on one side of the second carbon film resistor layer (19) facing the third conductive metal circuit layer (15) and the fifth conductive metal circuit layer (17); the second trimmed edge segment (20) is located within 5% of the effective angle at both ends of the second carbon film resistor layer (19); The width of the first trimming edge segment (13) and the second trimming edge segment (20) are both set to 0.2 mm.

3. A high-precision linear arc-shaped carbon diaphragm structure according to claim 1, characterized in that: The first carbon film resistor layer (12) is provided with a first trimmed edge segment (13) by laser trimming at two opposite sides of the second conductive metal circuit layer (14) and the sixth conductive metal circuit layer (18); the first trimmed edge segment (13) is located within 5% of the effective angle at both ends of the first carbon film resistor layer (12); The second carbon film resistor layer (19) is provided with a second trimmed edge segment (20) by laser trimming at two opposite sides of the second carbon film resistor layer (19) close to the third conductive metal circuit layer (15) and the fifth conductive metal circuit layer (17); the second trimmed edge segment (20) is located within 5% of the effective angle at both ends of the second carbon film resistor layer (19); The width of the first trimming edge segment (13) and the second trimming edge segment (20) are both set to 0.2 mm.

4. The high-precision linear arc-shaped carbon diaphragm structure according to claim 1, characterized in that: A third trimmed edge segment (21) is formed by laser trimming on one side of the first carbon film resistor layer (12) along the arc length direction thereof and located between the second conductive metal circuit layer (14) and the sixth conductive metal circuit layer (18); the third trimmed edge segment (21) is located within 90% of the effective angle at both ends of the first carbon film resistor layer (12); A fourth trimmed edge segment (22) is formed by laser trimming on one side of the second carbon film resistor layer (19) along its arc length direction and located between the third conductive metal circuit layer (15) and the fifth conductive metal circuit layer (17); the fourth trimmed edge segment (22) is located within 90% of the effective angle at both ends of the second carbon film resistor layer (19); The widths of the third trimming edge segment (21) and the fourth trimming edge segment (22) are both set to 0.2 mm.

5. The high-precision linear arc-shaped carbon diaphragm structure according to claim 1, characterized in that: The first carbon film resistor layer (12) is provided with a third trimmed edge segment (21) by laser trimming on two opposite sides along the arc length direction thereof and located between the second conductive metal circuit layer (14) and the sixth conductive metal circuit layer (18); the third trimmed edge segment (21) is located within 90% of the effective angle at both ends of the first carbon film resistor layer (12); The second carbon film resistor layer (19) is provided with a fourth trimmed edge segment (22) by laser trimming on two opposite sides along the arc length direction thereof and located between the third conductive metal circuit layer (15) and the fifth conductive metal circuit layer (17); the fourth trimmed edge segment (22) is located within 90% of the effective angle at both ends of the second carbon film resistor layer (19); The widths of the third trimming edge segment (21) and the fourth trimming edge segment (22) are both set to 0.2 mm.

6. A high-precision linear arc-shaped carbon diaphragm structure according to claim 1, characterized in that: The first conductive metal circuit layer (11), the second conductive metal circuit layer (14), the third conductive metal circuit layer (15), the fourth conductive metal circuit layer (16), the fifth conductive metal circuit layer (17), and the sixth conductive metal circuit layer (18) are all respectively configured as silver layers.

7. A high-precision linear arc-shaped carbon diaphragm structure according to claim 6, characterized in that: The thickness of the first conductive metal circuit layer (11), the second conductive metal circuit layer (14), the third conductive metal circuit layer (15), the fourth conductive metal circuit layer (16), the fifth conductive metal circuit layer (17), and the sixth conductive metal circuit layer (18) is set to 8 to 12 um.

8. A high-precision linear arc-shaped carbon diaphragm structure according to claim 7, characterized in that: The film thickness of the first carbon film resistor layer (12) and the second carbon film resistor layer (19) is set to 10-15 um.

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