Vehicle-mounted flexible circuit board capable of protecting gold surface in advance

Abstract

The utility model provides a vehicle-mounted flexible circuit board capable of protecting a gold surface in advance, which is provided with a circuit, the circuit is provided with an area with the gold surface, a transparent adhesive tape is adhered to the circuit, an adhesive-free tearing head is adhered to the outer side of the transparent adhesive tape, and the gold surface is covered by the transparent adhesive tape. According to the utility model, the defects of scratch, pollution, foreign matters and the like of the golden fingers, the sliding keyboard, the keys and the like of the flexible circuit board are reduced, and the product quality and the safety performance are improved.

Description

Technical Field

[0001] The utility model relates to a flexible circuit board structure and a production process, in particular to a vehicle-mounted flexible circuit board with a pre-protected gold surface. Background Art

[0002] Flexible circuit boards have a wide range of applications, and different electronic products have different quality requirements. For example, automotive electronic products have much stricter quality requirements than ordinary consumer electronic products. Flexible circuit boards in some contact parts of automotive electronic products require that the gold-plated surfaces of gold fingers, sliding keyboards, buttons, etc. must not have scratches, pollution, foreign matter, etc. This requires that the production, packaging, and installation of flexible circuit boards must protect the gold surface well. Utility Model Content

[0003] The utility model provides a vehicle-mounted flexible circuit board with a pre-protected gold surface, which aims to solve the shortcomings of the prior art, reduce scratches, pollution, foreign matter and other defects on the gold fingers, sliding keyboards, buttons and other parts of the flexible circuit board, and improve product quality and safety performance.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A vehicle-mounted flexible circuit board with a pre-protected gold surface, characterized in that:

[0006] A circuit is provided, and an area with a gold surface is provided on the circuit. A transparent tape is adhered to the circuit, and a non-adhesive tear-off head is adhered to the outer side of the transparent tape. The gold surface is covered by the transparent tape.

[0007] The gold area is for gold fingers or sliding keyboards or buttons.

[0008] There are two pieces of transparent tape on the circuit, and the non-adhesive tear heads are located on both sides of the flexible circuit board. There is an area without tape between the two pieces of transparent tape.

[0009] The utility model is beneficial in that:

[0010] The utility model presses and bakes the semi-finished flexible circuit board with the covering film exposed, the sliding keyboard and the buttons, and then punches out the windows of the specified size at the tearing heads at both ends of the flexible circuit board, and performs gold plating to obtain the semi-finished flexible circuit board with the gold surface exposed, such as the gold fingers, the sliding keyboard and the buttons. A light yellow transparent high temperature resistant protective tape is used, which is cut into the required size according to the design requirements, and the crescent-shaped clearance grooves, positioning holes, etc. are cut according to the specified positions and sizes. Then a layer of green PET is pasted on both ends of the tape according to the specified size, so that the tape has a glue area at the position to be protected, and the two ends of the green PET part are glue-free areas. Then, the semi-finished flexible circuit board with the gold fingers, the sliding keyboard and the buttons exposed on the gold surface is pasted on the tape through a fixture, and it is laminated to make it smoother. The finished product after punching and other processes is sent to the customer. When the customer uses it, he pinches the non-glue tearing head and easily tears off the glue part together with the glue part, revealing the finished flexible circuit board with gold fingers, sliding keyboard, and buttons, thereby achieving the purpose of pre-protecting the gold surface of the flexible circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 This is the overall structure diagram of the finished product;

[0013] Figure 2 It is the circuit layer plan;

[0014] Figure 3 It is the plan view of the window layer of the covering film;

[0015] Figure 4 This is a structural diagram after the cover film and the circuit layer are pressed together;

[0016] Figure 5 Plan view of the semi-finished product after chemical nickel-gold plating on the circuit layer with a cover film;

[0017] Figure 6 This is a plan view of the PET tear head and protective tape after being attached;

[0018] Figure 7 This is the structural diagram after the PET tear head is bonded with the tape;

[0019] Figure 8 It is a finished product with PET tear-off tape attached;

[0020] Fig. 9 It is a special fixture;

[0021] Fig.10 This is a schematic diagram of the fixture alignment;

[0022] Fig.11 For panelized circuit boards;

[0023] Fig.12 Covering the panels with a film layer;

[0024] Fig.13 It is a semi-finished product after the circuit is covered with a film;

[0025] Fig.14 Punch out the flexible circuit board for the tear head part and plate it with gold;

[0026] Fig.15 Tape layer for the panel;

[0027] Fig.16 It is a green PET layer;

[0028] Fig.17 For PET to be attached to the tape;

[0029] Fig.18 The protective tape with PET tear head is attached to the semi-finished flexible circuit board;

[0030] Fig.19 It is the finished product after punching of flexible circuit board with tear-off protection tape. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the technical solution of the utility model, the following will briefly introduce the drawings required for the description. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without creative work. In order to facilitate the understanding of the utility model, the following will be combined with the drawings and specific embodiments to explain the utility model in more detail.

[0032] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more centered elements can exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more centered elements can exist between them. The terms "upper", "lower", "inner", "outer", "bottom", etc. used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] The utility model structure is as follows Figure 1 As shown:

[0034] A polyimide flexible cover plate comprises a circuit 1, on which a gold finger 3 with a gold surface, a sliding keyboard 4 and a sliding keyboard 6, and a key 5 are provided. The circuit 1 is adhered with a high temperature resistant yellow transparent tape 8 and a high temperature resistant yellow transparent tape 9, and the high temperature resistant yellow transparent tape 8 has a green PET adhesive-free tearing head 10 and the high temperature resistant yellow transparent tape 9 has a green PET adhesive-free tearing head 11, and the gold surface is covered by the high temperature resistant yellow transparent tape 8 and the high temperature resistant yellow transparent tape 9.

[0035] According to the customer's design requirements, the polyimide flexible cover plate is exposed, developed, and etched to form the required circuit 1 and gold finger 3, sliding keyboard 4 and sliding keyboard 6, key 5 and other circuit layers (such as Figure 2 shown).

[0036] After the gold finger 3 is set to open the window 3-1, the sliding keyboard 4 is set to open the window 4-1, the sliding keyboard 6 is set to open the window 6-1, and the key 5 is set to open the window 5-1, the covering film 2 (such as Figure 3 As shown in FIG. 1 , a jig is used to fit the circuit 1 according to the positioning hole 103 to expose the required gold finger 3, sliding keyboard 4 and sliding keyboard 6, key 5, and then pressed and baked to obtain a semi-finished flexible circuit board A (as shown in FIG. 1 ) to be plated with gold. Figure 4 shown).

[0037] The tearing head parts on both sides are punched out according to the specified size, and then the semi-finished product is electroplated with nickel gold or chemically plated with nickel gold to obtain a semi-finished flexible circuit board (such as a gold finger 1 with a gold surface, a sliding keyboard 4 and a sliding keyboard 6, a key 5, etc.) Figure 5 shown).

[0038] Then pre-made, high temperature resistant yellow transparent tape 8 with green PET glue-free tearing head 10 and high temperature resistant yellow transparent tape 9 with green PET glue-free tearing head 11 (such as Figure 6 Its structure is as shown in Figure 7 The B board shown in the figure uses a jig to stick the semi-finished flexible circuit board on the tape according to the positioning hole 103, and leaves an area 7 that is not attached to the tape for easy installation. After plastic flattening, a flexible circuit board product (such as a flexible circuit board) with high temperature resistant yellow transparent tape 8 and high temperature resistant yellow transparent tape 9 and PET non-glue tearing heads 10 and PET non-glue tearing heads 11 on both sides that is easy to tear off the tape is formed. Figure 8 shown).

[0039] The finished product is sent to the customer. When using it, the customer pinches the non-glue tear head and easily tears off the glue part together with the glue part, then reveals the finished flexible circuit board with gold fingers, sliding keyboard, and buttons, thereby achieving the purpose of pre-protecting the gold surface of the flexible circuit board.

[0040] A process for manufacturing a vehicle-mounted flexible circuit board with a pre-protected gold surface:

[0041] Step 1: According to the circuit designed by the customer, the single circuit layer is assembled into panels 107, and corresponding positioning holes 103, positioning holes 106, etc. are placed, such as Fig.11 As shown, according to the circuit layer panel, the gold finger 3, the sliding keyboard 4 and the sliding keyboard 6, the key 5 and other covering film openings and positioning holes are designed at the specified positions, such as Fig.12 As shown;

[0042] Step 2: Based on the circuit layer panel 107 of step 1, the circuit layers such as the gold finger 3, the sliding keyboard 4 and the sliding keyboard 6, the key 5 and the positioning hole ring of the positioning hole 103 and the positioning hole ring of the positioning hole 106 are etched on the copper clad board of the polyimide 1, and positioning holes are punched in the positioning rings, such as Fig.11 As shown;

[0043] Step 3: According to the design requirements, the cover film 2 is cut at the specified position using a laser machine to obtain the opening 3-1 of the gold finger 3, the opening 4-1 of the sliding keyboard 4 and the opening 6-1 of the sliding keyboard 6, the opening 5-1 of the key 5, and the positioning holes 103 and 106 on the cover film, as shown in FIG. Fig.12 As shown;

[0044] Step 4: Insert the positioning holes 103 around the circuit layer into a special fixture (such as Fig. 9 As shown, the jig is composed of a bottom plate 101, a stripping plate 102 and four positioning pins 103-d), and then the cover film ( Fig.12 ), insert the jig positioning pins 103-d into the corresponding four positioning holes 103, and after checking that they are correct, use a flat-head electric soldering iron to press and iron around to pre-fix the covering film on the circuit layer, lift the jig stripping plate with both hands, take out the semi-finished product with the covering film attached, and then press and bake to obtain a semi-finished flexible circuit board with exposed gold fingers 3, sliding keyboard 4 and sliding keyboard 6, key 5 and other parts, such as Fig.13 As shown;

[0045] Step 5: Punch the torn ends of the semi-finished product of step 4 according to the specified size to obtain the following Fig.14 The window 10' of the PET glue-free tearing head 10 and the window 11' of the PET glue-free tearing head 11 are shown;

[0046] Step 6: Electroplating or chemically plating the semi-finished product of step 5 with nickel-gold to expose the gold finger 3, sliding keyboard 4 and sliding keyboard 6, key 5 and other parts to obtain a semi-finished product with a nickel-gold surface of required thickness, and drying. Fig.14 As shown, the semi-finished flexible circuit board completed in step 6 is called layer A;

[0047] Step 7: Cut the high temperature resistant yellow transparent tape with release paper into the specified puzzle size, and use laser or mold to cut out the crescent-shaped groove 104 and square groove 7' positions where windows are needed, as well as positioning holes 103 and other positioning holes. The crescent-shaped groove 104 is specially designed for the sliding keyboard 4 and the sliding keyboard 6. There is a PI reinforcement with a thickness of 0.2mm on the back of the sliding keyboard. If the tape is punched together with the reinforcement, the glue of the tape is easy to adhere to the edge with the chips generated during the punching of the reinforcement. Therefore, the tape must be shrunk by 0.3-0.5mm, that is, the inner side of the crescent groove is 0.3-0.5mm smaller than the size to be punched. In this way, only the flexible circuit board body and the PI reinforcement are punched during punching, and the tape will not be punched; the square groove 7 is a part specially reserved for a certain section of the flexible circuit board that does not require the tape when installing, such as Fig.15 As shown;

[0048] Step 8: Insert the four positioning holes 103 of the tape completed in step 7 into the four positioning pins 103-d of the fixture, first tear off a small section of the release paper on one side, press it with one hand, and use the other hand to make the green PET non-glue tear head 10 and green PET non-glue tear head 11 with a thickness of 0.1mm according to the design (such as Fig.16 As shown), press the positioning holes 103 to respectively insert the two positioning pins 103-d of the jig, then release the torn release paper and stick it back to the tape, that is, the green PET non-glue tearing head 10 and the green PET non-glue tearing head 11 are respectively pasted on the tapes on both sides, the tape is the lower layer, the PET non-glue tearing head is the middle layer, and the release paper is the upper layer. The same method is used on the other side. In this way, two sides with green PET non-glue tearing heads are formed. Lift the stripping plate of the jig with both hands and take out the semi-finished product with the PET non-glue tearing head attached, as shown. Fig.17 The tape layer with PET adhesive-free tear heads on both sides completed in step 7 is called layer B;

[0049] Step 9: Put the four positioning holes 103 of the layer B completed in step 8 with the adhesive side facing up, and insert them into the fixture positioning pins 103-d, and then tear off the release paper. Then put the semi-finished layer A of the flexible circuit board completed in step 6 with the gold side facing down, and insert the four positioning holes 103 into the fixture positioning pins 103-d, so that the flexible circuit board is pasted on the high-temperature resistant yellow transparent tape with adhesive in the middle section, and the two sides are the non-adhesive tear heads, such as Fig.10 As shown, then lift the jig stripping plate with both hands, take out the semi-finished product with the tape attached, and laminate it to make it stick more smoothly, as shown in the figure below. Fig.18 As shown. In this way, the flexible circuit board semi-finished product A is bonded to the tape B with no adhesive tearing heads on both sides, which plays a role in protecting the gold surface.

[0050] Step 10: Punch the semi-finished flexible circuit board with tear head protective tape in step 9 to obtain a single flexible circuit board with tear head protective tape, and leave an area 7 that is not taped to be fixed on the mechanism for installation, a high temperature resistant yellow transparent tape 8 and a high temperature resistant yellow transparent tape 9, and a flexible circuit board with PET non-glue tear heads 10 and PET non-glue tear heads 11 on both sides, which are easy to tear off the tape. Fig.19 The finished product is sent to the customer. When the customer uses it, he pinches the non-glue tearing head and easily tears off the glue part together with the glue part, and then the gold finger, sliding keyboard, and button of the flexible circuit board with gold surface are exposed, thereby achieving the purpose of pre-protecting the gold surface of the flexible circuit board.

[0051] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the utility model. Various modifications to these embodiments will be obvious to professionals and technicians in this field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A vehicle-mounted flexible circuit board with a pre-protected gold surface, characterized in that: A circuit is provided, and an area with a gold surface is provided on the circuit. A transparent tape is adhered to the circuit, and a non-adhesive tear-off head is adhered to the outer side of the transparent tape. The gold surface is covered by the transparent tape.

2. The vehicle-mounted flexible circuit board with pre-protected gold surface as claimed in claim 1, characterized in that: The area of ​​the gold surface is a gold finger or a sliding keyboard or a key.

3. The vehicle-mounted flexible circuit board with pre-protected gold surface as claimed in claim 1, characterized in that: There are two pieces of transparent tape on the circuit, and the non-adhesive tear heads are located on both sides of the flexible circuit board. There is an area without tape between the two pieces of transparent tape.

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