Heating flexible circuit sheet with special-shaped structure

Abstract

The utility model discloses a heating flexible circuit sheet with a special-shaped structure, which comprises a functional layer, and the functional layer comprises a flexible substrate and a heating structure arranged on the front surface of the substrate. The heating structure comprises two heating layers, a first connecting electrode layer and a second connecting electrode layer which are arranged on the upper surface of the substrate in a layered silk-screen mode. Each heating layer is partially overlapped with the first connecting electrode layer and the second connecting electrode layer, so that a zigzag and equal-width linear area is formed between the first connecting electrode layer and the second connecting electrode layer, and the linear area forms an effective heating area of the heating layer. According to the heating flexible circuit sheet provided by the utility model, the innovative connection electrode design is adopted, so that the heating layer between the two connection electrodes forms a zigzag and equal-width linear area, thereby ensuring that the heating flexible circuit sheet is uniform in heating, high in temperature rise speed and capable of rapidly reaching a designed temperature value.

Description

Technical Field

[0001] The utility model relates to the field of electronic equipment, in particular to a heating flexible circuit sheet with a special-shaped structure. Background Art

[0002] Utility model patent CN209435460U discloses a heating flexible circuit sheet, such as Figure 1 As shown, the device comprises a thermal insulation layer 1, an insulating layer 2, and a functional layer 3 stacked and combined from top to bottom. The upper and lower surfaces of the functional layer 3 are respectively screen-printed with a heating structure and a physiotherapy structure. The heating structure comprises a silver paste layer and a heating layer. The silver paste layer is screen-printed on the substrate of the functional layer 3, and the heating layer is overlaid on the silver paste layer. The lower surface is also screen-printed with spaced heating electrodes and physiotherapy electrodes. The heating electrodes are conductively connected to the silver paste layer through vias, and the physiotherapy electrodes are conductively connected to the physiotherapy structure. The patent does not disclose the specific structure of the heating layer.

[0003] like Figure 2 As shown, in the conventional design of the heating structure, the silver paste layer includes a positive electrode and a negative electrode, and the positive electrode and the negative electrode are respectively arranged on both sides of the heating layer (including two blocks of carbon film 1 and carbon film 2). However, since the shapes of the therapy electrode patch and its heating structure are irregular, the positive electrode and the negative electrode have different paths through the various blocks of the heating layer (carbon film 1 and carbon film 2), which will cause uneven heating of the heating structure and severe temperature differences of more than 5°C, affecting user experience and safety of use. Utility Model Content

[0004] The present invention aims to provide a heat-generating flexible circuit sheet to solve the above-mentioned problems. To this end, the specific technical solutions adopted by the present invention are as follows:

[0005] A heat-generating flexible circuit sheet with a special-shaped structure, comprising a functional layer, wherein the functional layer comprises a flexible substrate and a heat-generating structure arranged on the front surface of the substrate;

[0006] The heating structure includes a heating layer, a first connecting electrode layer and a second connecting electrode layer which are layered and silk-screened on the upper surface of the substrate.

[0007] The number of the heating layers is two;

[0008] Each of the heating layers partially overlaps with the first connecting electrode layer and the second connecting electrode layer, thereby forming a tortuous, equal-width linear area between the first connecting electrode layer and the second connecting electrode layer, and the linear area constitutes the effective heating area of ​​the heating layer.

[0009] Furthermore, the linear regions are evenly distributed in the first block.

[0010] Furthermore, in the heating layer, the area of ​​the linear region accounts for no less than 65%.

[0011] Furthermore, the line width of the linear area is 1 mm to 6 mm.

[0012] Furthermore, the material of the heating layer is carbon paste; the material of the first connecting electrode layer and the second connecting electrode layer is silver paste; the resistivity of the carbon paste is much higher than that of the silver paste.

[0013] Furthermore, the substrate is a PI film, a PET film or a PC film.

[0014] Furthermore, the heating flexible circuit sheet has a symmetrical structure, with two heating layers arranged bilaterally and symmetrically; and the first connecting electrode layer and the second connecting electrode layer are arranged centrally and symmetrically.

[0015] Furthermore, the heat-generating flexible circuit sheet further includes two heat-generating electrodes provided on the lower surface of the substrate, and the two heat-generating electrodes are respectively connected to the first connecting electrode and the second connecting electrode through via holes.

[0016] Furthermore, the heating flexible circuit sheet also includes a physiotherapy structure silk-screened on the lower surface of the substrate, and the physiotherapy structure includes two physiotherapy electrode layers and two physiotherapy electrodes distributed on the left and right; the first physiotherapy electrode is arranged in the first physiotherapy electrode layer and electrically connected to the first physiotherapy electrode layer; the second physiotherapy electrode is arranged in the second physiotherapy electrode layer and electrically connected to the second physiotherapy electrode layer.

[0017] Furthermore, the material of the therapy electrode layer is carbon paste.

[0018] Furthermore, it also includes a heat preservation layer and an insulating layer, and the heat preservation layer, the insulating layer and the functional layer are stacked and combined together in sequence from top to bottom.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] The heating flexible circuit sheet of this utility model adopts an innovative connecting electrode design, so that the heating layer between the two connecting electrodes forms a tortuous, equal-width linear area. This linear area is the effective heating area of ​​the heating layer, which can be equivalent to multiple equal-value resistors in parallel, thereby ensuring that the heating flexible circuit sheet heats evenly and heats up quickly, and can quickly reach the designed temperature value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the stacked structure of a heat-generating flexible circuit sheet in the prior art;

[0022] Figure 2 This is a schematic diagram of the heating structure of a heating flexible circuit sheet in the prior art;

[0023] Figure 3 This is a top view of the functional layer of the heating flexible circuit sheet of the present invention;

[0024] Figure 4 This is a bottom view of the functional layer of the heating flexible circuit sheet of the present invention;

[0025] Figure 5A This is a structural diagram of the heating layer of the heating flexible circuit sheet of the present invention;

[0026] Figure 5B This is a structural diagram of the first connecting electrode layer of the heating flexible circuit sheet of the present invention;

[0027] Figure 5C This is a structural diagram of the second connecting electrode layer of the heating flexible circuit sheet of the present invention. DETAILED DESCRIPTION

[0028] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0029] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 3 and Figure 4 As shown, the present invention provides a structural schematic diagram of the functional layer 3 of a special-shaped heating flexible circuit sheet, including a substrate 31, a heating structure 32 silk-screened on the upper surface of the substrate 31, and a physiotherapy structure 33 silk-screened on the lower surface of the substrate 31.

[0031] The heating structure 32 includes heating layers 321a, 321b, a first connection electrode layer 322 and a second connection electrode layer 323, which are respectively as follows: Figure 5A 、 Figure 5B and Figure 5CAs shown. It is formed on the upper surface of the substrate 31 by layered silk-screening. The heating layers 321a and 321b are made of carbon paste material by silk-screening. The resistivity of carbon paste is relatively high, so it is used as a heating element. The first connecting electrode layer 322 and the second connecting electrode layer 323 are made of silver paste material by silk-screening. The resistivity of silver paste is relatively low, so when used as an electrode, its resistance can be considered to be zero. The first connecting electrode layer 322 and the second connecting electrode layer 323 are separated, and their shapes are both irregular blocks. The first connecting electrode layer 322 and the second connecting electrode layer 323 are connected to the heating layers 321a and 321b at the same time to form a complete heating circuit.

[0032] Through layered printing, the heating layers 321a, 321b partially overlap with the first and second connecting electrode layers 322, 323, thereby forming a zigzag, uniformly wide linear region 321c, 321d between the first and second connecting electrode layers 322, 323. Because the resistance of the first and second connecting electrodes is approximately zero, the overlapping region of the heating layers 321a, 321b with the first and second connecting electrode layers 322, 323 acts as a bypass, resulting in the effective heating region of the heating layers 321a, 321b. These linear regions 321c, 321d are equivalent to multiple equal-value resistors connected in parallel between the first and second connecting electrode layers 322, 323. Therefore, the current flowing through each point in the linear regions 321c, 321d is approximately equal, resulting in uniform heating. Through a suitable zigzag layout, the linear regions 321c can be evenly distributed within the heating layer 321a, thereby ensuring uniform heating across the entire region of the heating layer 321a. Similarly, the linear regions 321d can be evenly distributed within the heating layer 321b, thereby ensuring uniform heating across the entire region of the heating layer 321b. By narrowing the line widths of the overlapping regions of the first and second connecting electrode layers 322, 323, and the heating layers 321a and 321b, the area ratio and uniform distribution of the linear regions 321c and 321d within the heating layer 321a can be increased. For example, if the area ratio reaches 65% or more, uniform heating across the entire region of the heating layers 321a and 321b can be effectively ensured, ensuring that the temperature difference between the various regions of the heating layers 321a and 321b is no greater than 2°C.

[0033] Preferably, the line width of the linear regions 321c and 321d is 1 mm to 6 mm. This facilitates zigzag arrangement and satisfies the requirement for uniform distribution. The resistivity and line width of the carbon paste material can be selected based on the operating voltage and total resistance value requirements of the heating structure.

[0034] The heating flexible circuit sheet of this utility model adopts an innovative connecting electrode design, so that the heating layer between the two connecting electrodes forms a tortuous, equal-width linear area. This linear area is the effective heating area of ​​the heating layer, which can be equivalent to multiple equal-value resistors in parallel, thereby ensuring that the heating flexible circuit sheet heats evenly and heats up quickly, and can quickly reach the designed temperature value.

[0035] In this embodiment, a physical therapy structure 33 is further included, which is arranged on the lower surface of the substrate 31 .

[0036] In this embodiment, the heating electrodes 34a, 34b and the therapy electrodes 35a, 35b are disposed on the back surface of the substrate 31. To this end, the first connection electrode layer 322 and the second connection electrode layer 323 are connected to the heating electrodes 34a, 34b, respectively, through vias. The therapy electrodes 35a, 35b are formed directly on the therapy electrode layers 33a, 33b.

[0037] For easy connection and use, the heating electrodes 34a, 34b and the therapy electrodes 35a, 35b are all arranged in the middle of the substrate 31, so that they can be led out from the heating therapy electrode sheet through the same set of connectors.

[0038] In this embodiment, the physiotherapy structure 33 includes two physiotherapy electrode layers 33a and 33b distributed on the left and right and two physiotherapy electrodes 35a and 35b; the physiotherapy electrode 35a is arranged in the physiotherapy electrode layer 33a and is directly electrically connected to the physiotherapy electrode layer 33a; the physiotherapy electrode 35b is arranged in the physiotherapy electrode layer 33b and is directly electrically connected to the physiotherapy electrode layer 33b.

[0039] The physiotherapy electrode layers 33a and 33b are in contact with human skin directly or through conductive physiotherapy patches such as conductive hydrogel patches, conductive silicone patches or medicine patches, forming a loop through the physiotherapy electrode layer 33a, human skin to the physiotherapy electrode layer 33b, so that the heating flexible circuit sheet has multiple functions such as thermal therapy and physiotherapy.

[0040] Preferably, the material of the therapy electrode layers 33a and 33b is a non-metallic conductive material, usually a low-resistivity carbon paste material, such as HS080 carbon paste.

[0041] In this embodiment, the heating structure and the therapeutic structure are both formed on the substrate 31 using silk screen printing. The thickness of the heating structure and the therapeutic structure can be as thin as 0.025 mm. Alternatively, the substrate 31 can be made of polyimide (PI) film, PET film, or PC film, and its thickness can be as thin as 0.05 mm. In this case, the thickness of the functional layer 3 after processing can be as thin as 0.1 mm or less.

[0042] Combined with Figure 1For example, the heating flexible circuit sheet also includes structural layers such as a thermal insulation layer 1 and an insulating layer 2. The thermal insulation layer 1, the insulating layer 2 and the functional layer 3 are stacked and combined together from top to bottom. The heating flexible circuit sheet can lead out the heating electrodes 34a, 34b and the physiotherapy electrodes 35a, 35b from the middle thereof by means of leads or buckled pressing electrodes 4, and be connected to the physiotherapy host. The thermal insulation layer 1 is coated on the insulating layer 2 to slow down the heat dissipation. Therefore, the heat dissipation rate of the heating flexible circuit sheet is slow after the heating stops, which can achieve a very good user experience. The thermal insulation layer 1 can be made of soft heat-insulating materials such as PU leather, cloth or EVA foam. The insulating layer 2 is hot-pressed and encapsulated on the functional layer 3 to play an insulating and anti-oxidation role, thereby extending the service life of the heating flexible circuit sheet. Preferably, the insulating layer 2 can be made of PE.

[0043] A conductive physiotherapy patch 5 such as a conductive hydrogel patch, a conductive silicone patch or a medicine patch is also adhered to the lower surface of the functional layer 3, so that the heating flexible circuit sheet has multiple functions such as heat therapy and physiotherapy.

[0044] When the heating flexible circuit sheet uses the buckle 4 as a terminal, the conductive therapy patch 5 and the buckle 4 are preferably separated by an insulating sheet 6. This serves to separate the heating electrodes 34a, 34b from the conductive therapy patch 5 and prevent the conductive therapy patch (e.g., a conductive hydrogel patch) from corroding the buckle 4.

[0045] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the form and details of the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all of these changes are within the scope of protection of the present invention.

Claims

1. A heat-generating flexible circuit sheet with a special-shaped structure, characterized by: The functional layer includes a flexible substrate and a heating structure provided on the front surface of the substrate; The heating structure includes a heating layer, a first connecting electrode layer and a second connecting electrode layer which are layered and silk-screened on the upper surface of the substrate. The number of the heating layers is two; Each of the heating layers partially overlaps with the first connecting electrode layer and the second connecting electrode layer, thereby forming a tortuous, equal-width linear area between the first connecting electrode layer and the second connecting electrode layer, and the linear area constitutes the effective heating area of ​​the heating layer.

2. The heat-generating flexible circuit sheet according to claim 1, wherein: In the heating layer, the area of ​​the linear region accounts for no less than 65%.

3. The heat-generating flexible circuit sheet according to claim 1, wherein: The line width of the linear area is 1 mm to 6 mm.

4. The heat-generating flexible circuit sheet according to claim 1, wherein: The material of the heating layer is carbon paste; the materials of the first connecting electrode layer and the second connecting electrode layer are silver paste; the resistivity of the carbon paste is much higher than that of the silver paste.

5. The heat-generating flexible circuit sheet according to claim 1, wherein: The substrate is a PI film, a PET film or a PC film.

6. The heat-generating flexible circuit sheet according to claim 1, wherein: The heat-generating flexible circuit sheet further includes two heat-generating electrodes disposed on the lower surface of the substrate. The two heat-generating electrodes are respectively connected to the first connecting electrode and the second connecting electrode through via holes.

7. The heat-generating flexible circuit sheet according to claim 1, wherein: The heating flexible circuit sheet has a symmetrical structure, with two heating layers arranged bilaterally and symmetrically; the first connecting electrode layer and the second connecting electrode layer are arranged centrally and symmetrically.

8. The heat-generating flexible circuit sheet according to claim 1, wherein: The heating flexible circuit sheet also includes a physiotherapy structure silk-screened on the lower surface of the substrate, and the physiotherapy structure includes two physiotherapy electrode layers and two physiotherapy electrodes distributed on the left and right; the first physiotherapy electrode is arranged in the first physiotherapy electrode layer and electrically connected to the first physiotherapy electrode layer; the second physiotherapy electrode is arranged in the second physiotherapy electrode layer and electrically connected to the second physiotherapy electrode layer.

9. The heat-generating flexible circuit sheet according to claim 8, wherein: The material of the physiotherapy electrode layer is carbon paste.

10. The heat-generating flexible circuit sheet according to claim 1, wherein: It also includes a heat preservation layer and an insulating layer, wherein the heat preservation layer, the insulating layer and the functional layer are stacked and combined together in sequence from top to bottom.

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