CN201346752Y - Special vacuum chuck for flexible printed circuit (FPC) board - Google Patents

Abstract

A special vacuum suction cup for flexible printed circuit boards, characterized in that: the suction cup is composed of a tray, a porous plate and an exhaust pipe, the tray is a container with an open upper end, the porous plate is placed on the upper end of the tray, and the tray is opened The end is covered, and the exhaust pipe is located on the bottom surface or side wall of the tray and communicates with the inner cavity of the tray. In the process of processing, the utility model uses a vacuum pump to inhale air from the suction pipe on the tray table, which can generate strong adsorption force on the porous plate. When the FPC workpiece to be processed is placed on the vacuum suction cup, the vacuum pump will The strong adsorption force generated on the surface of the porous plate can effectively adsorb the FPC workpiece on the surface of the porous plate, so that the FPC workpiece has no deformation, the surface is flat, and it plays a good role in fixing it, which is very beneficial to the cutting process of ultraviolet laser ; In addition, because the vacuum suction cup is easy to manufacture, easy to process and low in cost, it is very suitable for the ultraviolet laser cutting process of FPC, and has a wide range of application values.

Description

A special vacuum suction cup for flexible printed circuit board

technical field

The utility model relates to a positioning and fixing device in a laser cutting processing system, in particular to a special vacuum sucker for a flexible printed circuit board

technical background

The English name of the flexible printed circuit board is: Flexible Printed Circuit Board, referred to as FPCB or FPC, it is a printed circuit board with a pattern made of a flexible substrate, which is composed of an insulating substrate and a conductive layer. There may be an adhesive between the material and the conductive layer. Due to the relatively good flexibility of the materials it uses, it has great advantages in the intensive assembly and multi-functional production of electronic products, which meets the development of electronic products in the direction of lightness, thinness, miniaturization and multi-function. trend.

Flexible circuit board is a composite printed circuit board, which is mainly composed of conductive layer (copper foil), insulating substrate (polyimide mold) and adhesive, and its thickness generally does not exceed 0.25mm. The classification of FPC According to the number of conductive layers, it can be divided into: single-layer board, double-layer board, multi-layer board and rigid-flex board.

Flexible printed circuit boards have the following characteristics:

1. It can be flexed and assembled three-dimensionally, replacing many transfer parts to maximize the use of effective space;

2. Products with higher density or finer pitch can be manufactured;

3. The roll-to-roll processing method (Roll-to-Roll) can be adopted, which is easy to be automated and mass-produced, thereby greatly improving productivity and achieving economical production.

Due to the characteristics of the FPC's own material, the FPC is prone to bending deformation after being subjected to an external force. The traditional processing of FPC adopts mold opening, and then realizes the cutting of FPC through mechanical stamping machining. This method often produces processing stress on FPC, which is prone to burrs and glue overflow, and it takes a long time to open the mold. , the cost is also higher. If the FPC is processed by ultraviolet laser cutting, it can well make up for the shortcomings of traditional processing. However, to use ultraviolet laser for cutting, the FPC to be processed must be fixed. However, because the FPC is soft and easy to deform, the positioning and fixing device in the traditional laser cutting processing system is no longer suitable for fixing the FPC. A new fixing device is needed to ensure that the FPC workpiece is fixed without causing its bending deformation and affecting the final processing quality.

In the traditional laser cutting processing system, in order to prevent the laser from causing damage to the fixture supporting the processed workpiece during the cutting process, the workpiece to be cut is usually placed on a special nail bed, which consists of numerous needle points. The machined workpiece is held up so that the laser can bend and last cut off the workpiece without cutting into the needle bed. This kind of workpiece fixing device is very suitable for laser cutting of rigid materials, but it is not suitable for rigid materials or flexible processing materials. Coaxial high-pressure gas injection is carried out in the direction of the laser beam (different high-pressure gases can be selected according to different types of materials, such as: oxygen, nitrogen or inert gas). If the fixed device is installed, the FPC will seriously deviate from the focus of the laser under the action of high-pressure gas, resulting in a significant decline in cutting quality, and even the FPC processing workpiece cannot be cut. Considering that FPC is a flexible printed circuit board material, it is easy to bend and deform under the action of external force. If the traditional laser cutting fixture is still used, the ideal cutting effect will not be achieved, so a new The advanced laser cutting fixture makes it fix the FPC workpiece well without deforming it and affecting the final laser cutting effect.

Utility model content

The purpose of this utility model is to solve the above-mentioned deficiencies in the background technology, and to propose a special vacuum chuck device for FPC ultraviolet laser cutting, so that it can easily fix the FPC processing workpiece without causing it to deform during processing. Ensure the flatness of FPC during the cutting process, and facilitate the cutting process of ultraviolet laser.

In order to achieve the above object, the utility model adopts the following technical scheme: a special vacuum suction cup for flexible printed circuit boards, which is characterized in that: the suction cup is composed of a tray, a porous flat plate and an exhaust pipe, and the tray is a container with an open upper end. The porous plate is placed on the upper end of the tray, the open end of the tray is covered, and the exhaust pipe is located on the bottom surface or side wall of the tray and communicates with the inner cavity of the tray.

The perforated plate may be made of a square grid-shaped ceramic plate.

The side length of the square holes of the square grid ceramic plate may be 1-2 mm, and the density may be 9-25 holes/cm ² .

A skeleton for supporting the porous plate may be provided inside the tray.

In the above solution, the exhaust pipe is connected to a vacuum pump.

In the process of processing, the utility model uses a vacuum pump to inhale air from the suction pipe on the tray table, which can generate strong adsorption force on the porous ceramic plate. When the FPC workpiece to be processed is placed on the vacuum suction cup, the vacuum pump The strong adsorption force generated on the surface of the porous ceramic plate can effectively adsorb the FPC workpiece on the surface of the porous ceramic plate, so that the FPC workpiece has no deformation and has a good surface flatness, which plays a good role in fixing it, which is very beneficial to the ultraviolet laser. In addition, because the vacuum suction cup is simple to manufacture, convenient to process and low in cost, it is very suitable for the ultraviolet laser cutting process of FPC, and has a wide range of application values.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a cross-sectional view along line A-A of Fig. 1 .

Detailed ways

The utility model is composed of the following parts: a tray 1, a porous plate 2, an air extraction pipe joint 3 and an air extraction pipe 4. The function of the tray is to install the perforated plate, and the tray is processed from an aluminum plate with a thickness of 30mm. There are two threaded holes on the bottom or side of the tray for installing two φ10 suction pipe joints 3, the two suction pipe joints 3 are respectively connected to two φ10 suction pipes 4, and the other ends of the two suction pipes are connected to the vacuum pump. There is a frame 5 inside the tray to support the porous plate, and the porous plate is placed on the frame to form the upper surface of the tray. After the porous plate is installed, glass glue or other materials are filled between the porous plate and the porous plate and between the porous plate and the tray. Elastic padding to hold the perforated plate in place and prevent it from sliding. After the porous plate is installed, it will be polished together with the tray to ensure the flatness of the surface. The porous plate is to purchase the existing porous ceramic plate, cut it according to the required size, and then splice it from multiple (4 pieces are used here). The porous ceramic plate is composed of a square grid. The side length of the square hole is 1-2mm, the density is 9-25 pieces/cm ² , and the wall thickness of the square hole is about 0.4mm. The size of the tray can be designed according to the size of the actual cut FPC. See Figure 1 and Figure 2 for its actual structure.

Claims (5)

1. A special vacuum suction cup for flexible printed circuit boards, characterized in that: the suction cup is composed of a tray, a porous flat plate and an exhaust pipe, the tray is a container with an open upper end, the porous flat plate is placed on the upper end of the tray, and the tray The open end is covered, and the exhaust pipe is located on the bottom surface or the side wall of the tray and communicates with the inner cavity of the tray. 2. A special vacuum chuck for flexible printed circuit boards according to claim 1, characterized in that: said porous plate is made of a square grid-shaped ceramic plate. 3. A special vacuum chuck for flexible printed circuit boards according to claim 2, characterized in that: the side length of the square hole of the square grid-shaped ceramic plate is 1-2 mm, and the density is 9-25 pieces/cm ² . 4. A special vacuum chuck for flexible printed circuit boards according to claim 1, characterized in that: a framework for supporting the porous plate is provided inside the tray. 5. A special vacuum chuck for flexible printed circuit boards according to claim 1, characterized in that: said suction pipe is connected to a vacuum pump.

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