Probe pressure head capable of rapidly cutting machine

Abstract

The utility model provides a probe pressure head capable of fast cutting, which comprises a flexible circuit board, a mounting plate, a probe template and a jig plate, the flexible circuit board is fixed between the mounting plate and the probe template, and the jig plate is mounted on one surface, far away from the flexible circuit board, of the probe template; the jig plate comprises a mounting part and a positioning part located on one side of the mounting part, the positioning part corresponds to a protruding probe on the probe template, an opening area is arranged on the positioning part, and at least one part of the probe is located in the opening area. By designing the replaceable jig plate, when a production line needs to convert and detect different types of liquid crystal display panels, only the corresponding jig plate needs to be replaced, and the whole flexible circuit board and the pressure head do not need to be manually replaced like a traditional mode. In the process, the switching step is greatly simplified, and the machine cutting time is remarkably shortened, so that the overall production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of display panel detection, and in particular relates to a probe pressure head capable of quickly cutting a machine. Background Art

[0002] In the LCD panel inspection industry, most products need to go through a key lighting step before entering the inspection process, which generally relies on automatic crimping technology. Through this technology, the electrical signal can be smoothly transmitted to the product, thereby completing the lighting operation. However, due to the diversity of customer needs and the wide variety of product types, coupled with the flexible and changeable production task arrangement, production equipment has to be frequently switched and adjusted. In the prior art, the flexible circuit board (FPC) and the pressure head are assembled as a whole. For different types of products, a specific FPC and a matching pressure head are required. Due to the different pin layouts and quantities of different products, the probe template in each pressure head is customized according to the number of pins of the corresponding product, resulting in a wide variety of pressure heads. Whenever the type of product to be inspected needs to be changed, the operator must manually replace the entire FPC and its matching pressure head to meet the inspection needs of the new product. This process is not only time-consuming and labor-intensive, but also seriously restricts the improvement of production efficiency, and also increases the complexity and cost of equipment maintenance. Utility Model Content

[0003] In order to solve all or part of the problems of the above-mentioned prior art, the utility model provides a probe pressure head that can be quickly cut, and realizes that for different types of flexible circuit boards, only one universal pressure head body is needed, and it is matched with a jig plate corresponding to the new product to meet the production needs. There is no need to replace the entire pressure head every time the product is changed as in the traditional way.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A probe press head capable of rapid machine cutting includes a flexible circuit board, a mounting plate, a probe template and a jig plate, wherein the flexible circuit board is fixed between the mounting plate and the probe template, and the jig plate is mounted on a side of the probe template away from the flexible circuit board; the jig plate includes a mounting portion and a positioning portion located on one side of the mounting portion, wherein the positioning portion corresponds to a probe protruding from the probe template, and an opening area is provided on the positioning portion, wherein at least a portion of the probe is located within the opening area. By designing a replaceable jig plate, when the production line needs to switch to detect different types of liquid crystal display panels, only the corresponding jig plate needs to be replaced, without the need to manually replace the entire flexible circuit board and press head as in the traditional method. This process greatly simplifies the switching steps and significantly shortens the machine cutting time, thereby improving overall production efficiency.

[0006] Optionally, the positioning portion includes an opening area and at least one shielding area, the probe located in the opening area passes through the fixture plate, and the probe located in the shielding area is shielded by the shielding area of ​​the positioning portion. By clearly dividing the opening area and the shielding area, it can be ensured that only the probes of predetermined design can completely pass through the opening area and achieve electrical connection with the product to be tested. The probes located in the shielding area are effectively blocked, avoiding unnecessary electrical contact, thereby improving the accuracy and reliability of the entire electrical connection.

[0007] Optionally, the fixture board is provided with the positioning parts on both sides of the relative direction, and the positioning parts on both sides correspond to and adapt to two probes of different specifications or arrangements. The flexibility and compatibility of the fixture board are improved, so that it can adapt to LCD panels with different pin specifications or arrangements by selecting positioning parts on different sides without replacing the entire fixture board.

[0008] Optionally, the specification range of the jig plate includes 50-96 probe pins. This covers the pin quantity requirements of most LCD panels on the market. This means that the same set of testing equipment can be adapted to the testing of LCD panels of different models and specifications by replacing jig plates of different specifications, greatly improving the compatibility and application range of the equipment.

[0009] Optionally, the shielding area is an adjustable shielding member, and the size of the opening area is determined by the position of the shielding member; the mounting portion is provided with a mounting hole, and the fixture plate is mounted on the probe template through the mounting hole. This design allows the number and position of shielded probes to be adjusted according to different test requirements without replacing the fixture plate during cutting. The position of the shielding member can be simply adjusted.

[0010] Optionally, the probe template includes an upper needle template, a probe and a lower needle template, a first step portion is provided on one side of the lower needle template, the first step portion is used to install the upper needle template, and both ends of the probe are installed in preset through holes of the upper needle template and the lower needle template, respectively. The split structural design allows the upper needle template and the lower needle template to be maintained and replaced independently, simplifying the maintenance process.

[0011] Optionally, the probe template includes an upper needle template, a probe and a lower needle template, and the upper needle template is evenly provided with a plurality of first stepped through holes for the probe to pass through, and the first stepped through holes are longitudinally divided into two sections with different diameters, the first section is located on a side away from the lower needle template, and the second section is located on a side close to the lower needle template, and the diameter of the first section is smaller than the diameter of the second section. Since the diameter of the first section is smaller than the diameter of the second section, a step-like structure is formed, which can effectively prevent the probe from falling off or loosening due to uneven force during use or replacement, thereby enhancing the overall stability of the probe template.

[0012] Optionally, a second stepped through hole is provided at a position corresponding to the first stepped through hole on the lower needle template, and the second stepped through hole is longitudinally divided into two sections with different diameters, the third section is located on a side away from the upper needle template, and the fourth section is located on a side close to the upper needle template, and the diameter of the third section is smaller than the diameter of the fourth section. Both stepped through holes have a stepped structure, so the probe is effectively supported and fixed at both ends.

[0013] Optionally, the upper needle template is provided with a plurality of first mounting holes, and the lower needle template is provided with matching second mounting holes at corresponding positions, and the first mounting holes and the second mounting holes are connected by a connector. A stable connection between the upper needle template and the lower needle template is achieved, and a connector such as a pin or a screw is usually used to pass through the first mounting hole and the second mounting hole for locking and fixing, so as to complete the assembly of the probe template so that it can be integrally mounted on the flexible circuit board and the mounting plate.

[0014] Optionally, the probe installation areas of the upper needle template and the lower needle template are respectively provided with a second step portion and a third step portion, and the second step portion and the third step portion enable the middle of the probe to have a visible portion exposed to the outside, and the probe includes a main body, an upper needle head and a lower needle head, and the length of the main body is 1.5-15 times the length of the visible portion. Through the reasonable structural configuration of the exposed visible part, the probe's ability to withstand external pressure and impact is enhanced, and the risk of damage is significantly reduced. In addition, by retaining an appropriate length of the visible part, the real-time monitoring of the probe status is facilitated. The user can intuitively check whether the probe has a needle stuck phenomenon, whether the elastic performance is reduced, or whether there are burnt marks caused by the passage of large current, ensuring that any potential problems can be quickly discovered and effectively handled.

[0015] Optionally, the probe includes a main body, an upper needle head and a lower needle head, and the ratio between the length of the main body and the standard stroke of the probe is 4-6:1; the middle part of the probe exposed to the outside is the visible part, and the ratio between the length of the main body and the length of the visible part is 1.5-3:1. The reasonable structural layout enhances the probe's ability to withstand external pressure and impact, significantly reduces the risk of damage, and facilitates real-time monitoring of the probe status by retaining an appropriate length of the visible part. Users can intuitively check whether the probe has a stuck needle phenomenon, whether the elastic performance is reduced, or whether there are burnt marks caused by the passage of large currents, ensuring that any potential problems can be quickly discovered and effectively handled.

[0016] Optionally, the length of the first section of the first stepped through hole in the upper needle template is A, the range of A is not greater than 0.3mm, the length of the second section is B, the range of B is 1.5-6mm, and the relationship between the thickness H1 of the second stepped portion of the upper needle template and the thickness H2 of the upper needle template is: H1=H2-AB. The thickness of the second stepped portion of the upper needle template is mainly determined by comprehensively considering the material of the needle template and the elasticity of the probe, as well as the type and performance of the probe, the thickness and material of the needle template, the difficulty of the processing method, the processing efficiency and other factors. Through the reasonable structural configuration of the thickness of the second step portion, the probe's ability to withstand external pressure and impact is enhanced, and the risk of damage is significantly reduced. In addition, by retaining an appropriate visible length, it is convenient to monitor the status of the probe in real time. The user can intuitively check whether the probe has a stuck needle phenomenon, whether the elastic performance is reduced, or whether there are burnt marks caused by the passage of large current, ensuring that any potential problems can be quickly discovered and effectively handled. Among them, the thickness configuration of the third step portion is considered in the same way.

[0017] The thickness of the lower needle template is 1.5-3 times the thickness of the upper needle template. The thickness of the upper needle template and the lower needle template are designed to be as thin as possible, which can effectively reduce the processing difficulty while adapting to the probe size.

[0018] The utility model has at least the following beneficial effects:

[0019] 1) By designing a replaceable jig plate, rapid detection conversion of medium and large-sized panel detection is achieved. When the production line needs to change the detection object, only the corresponding jig plate needs to be replaced, without replacing the entire flexible circuit board and the pressure head device, which significantly shortens the cutting time and improves the overall production efficiency. There are positioning parts on both sides of the jig board, which correspond to probes of different specifications or arrangements. This design improves the flexibility and compatibility of the jig board. The design of the jig board covers a variety of pin specifications (such as 50pin-96pin), and probes of different arrangements can be adapted by selecting positioning parts on different sides. This wide compatibility enables the same set of probe pressure heads to support the testing of multiple LCD panels, reducing production costs and reducing the waste of resources caused by frequent equipment replacement.

[0020] 2) The shielding area on the fixture plate is an adjustable shielding part. Users can adjust the number and position of shielded probes according to different test requirements without replacing the entire fixture plate, further reducing maintenance costs and time. The probe template adopts a stepped through-hole design. The stepped through-holes on the upper needle template and the lower needle template are divided into sections with different diameters in the longitudinal direction. This design effectively prevents the probe from falling off or loosening due to uneven force during use or replacement, and enhances the overall stability of the probe template. The second step and the third step are opened on the side where the upper needle template and the lower needle template contact each other, so that the part of the probe that passes through these steps is exposed to the outside, which is convenient for users to observe the status of the probe in real time, and promptly discover and deal with problems such as stuck needles, elastic failure or burning black, to ensure the accuracy and safety of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is an exploded view of a probe pressure head capable of quickly cutting a machine in an embodiment of the utility model.

[0023] Figure 2 It is a schematic structural diagram of a probe pressure head capable of quickly cutting a machine in an embodiment of the utility model.

[0024] Figure 3 It is an exploded view of the probe template in the embodiment of the utility model.

[0025] Figure 4 The embodiment of the utility model provides Figure 3 Side view of the probe template.

[0026] Figure 5 It is a schematic diagram of the structure of the probe in the embodiment of the utility model.

[0027] Figure 6 This is a schematic diagram of the structure of a fixture board with a specification of 60 pin in an embodiment of the utility model.

[0028] Figure 7 This is a schematic diagram of the structure of a fixture board with a specification of 80 pin in an embodiment of the utility model.

[0029] Figure markings: 1-flexible circuit board; 2-mounting plate; 3-probe template; 301-upper needle template; 302-probe; 3021-main body; 3022-upper needle head; 3023-lower needle head; 3024-visible part; 303-lower needle template; 4-jig plate; 401-mounting part; 402-positioning part; 4021-opening area; 4022-shielding area. DETAILED DESCRIPTION

[0030] The technical solutions in the specific embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0032] In the present utility model embodiment, combined with reference Figure 1-Figure 7 As shown, a probe press head that can quickly cut the machine is provided, and the core components of the press head include a flexible circuit board 1, a mounting plate 2, a probe template 3 and a fixture plate 4. Among them, the flexible circuit board 1 is fixed between the mounting plate 2 and the probe template 3, and the fixture plate 4 is installed on the side of the probe template 3 away from the flexible circuit board 1. The design of the fixture plate 4 includes two main parts: a mounting portion 401 and a positioning portion 402 located on one side of the mounting portion 401. The positioning portion 402 matches the protruding probe 302 on the probe template 3, and is provided with an opening area 4021 thereon. These opening areas 4021 allow at least a portion of the probes 302 to pass completely, thereby achieving effective contact with the connector. In addition, the positioning portion 402 also includes at least one shielding area 4022, which is used to block the probes 302 located in the area to prevent them from passing through, thereby ensuring that only the selected probes 302 can contact the test point. Through this design, the utility model not only improves the versatility and flexibility of the probe pressure head, but also can realize efficient testing of a variety of different products by quickly switching different fixture plates 4, thereby significantly improving production efficiency and product quality.

[0033] In other specific embodiments, the two sides of the mounting portion 401 can be independently provided with a positioning portion 402, and the two positioning portions 402 are designed to be different to correspond to and accurately adapt to two probes 302 of different specifications or arrangements. This design greatly improves the flexibility and compatibility of the fixture plate 4, so that it can adapt to liquid crystal display panels with different pin specifications or arrangements by selecting positioning portions 402 on different sides without replacing the entire fixture plate 4. This reduces the downtime and cost caused by frequent replacement of the fixture plate 4 on the production line, and improves production efficiency. The mounting portion 401 is provided with mounting holes, through which the fixture plate 4 can be firmly mounted on the probe template 3. In order to further optimize the functionality and practicality of the pressure head, the shielding area 4022 of the positioning portion 402 can be set as an adjustable shielding member. In this way, there is no need to replace the fixture plate 4 when cutting the machine. Only the position of the shielding member needs to be simply adjusted to adjust the number and position of the shielding probe 302 according to different test requirements.

[0034] In this embodiment, the specification range of the fixture board 4 includes 50-96 pins, where each pin represents a probe installed on the fixture board. The fixture board 4 is designed to adapt to various test scenarios and provides different specifications such as 50, 60, 68, 80 and 96 pins. Take the fixture board 4 with a specification of 60 pins as an example (e.g. Figure 6 As shown in FIG. 4 ), the two ends of the positioning portion 402 are provided with shielding areas 4022, and the continuous area in the middle is an opening area 4021. This design allows at least a portion of the probes 302 to completely pass through the opening area 4021 to achieve effective contact with the connector, while the shielding area 4022 prevents other probes 302 from passing through, ensuring that only the selected probes 302 can contact the test point. For the 80-pin specification fixture board 4 (such as Figure 7 As shown in FIG. 4 ), one end of the positioning portion 402 is provided with a shielding area 4022, and the other end is an opening area 4021. This design also achieves effective contact and shielding of the probe 302, and adapts to different test requirements.

[0035] The probe template 3 includes an upper needle template 301, a probe 302 and a lower needle template 303. A first step portion is provided on one side of the lower needle template 303, and the upper needle template 301 is embedded and installed in the first step portion. The upper needle template is installed in the first step portion. Optionally, the upper needle template 301 and the lower needle template 303 have flush mounting surfaces, so as to facilitate further assembly of a flexible circuit board and a mounting plate thereon. The probe template 3 adopts a split structure design, which is convenient for timely maintenance or replacement. The two ends of the probe 302 are respectively installed in the preset through holes of the upper needle template 301 and the lower needle template 303. A plurality of first step through holes for the probe 302 to pass through are evenly provided on the upper needle template 301. These first step through holes are divided into two sections with different diameters in the longitudinal direction: the first section is located on the side away from the lower needle template 303, and its diameter is smaller than the diameter of the second section; the second section is located on the side close to the lower needle template 303. Second stepped through holes are respectively provided at positions corresponding to the first stepped through holes on the lower needle template 303. These second stepped through holes are also divided into two sections with different diameters in the longitudinal direction: the third section is located on the side away from the upper needle template 301, and its diameter is smaller than the diameter of the fourth section; the fourth section is located on the side close to the upper needle template 301. This design enables the probe 302 to be stably installed between the upper needle template 301 and the lower needle template 303. By respectively providing stepped through holes in the upper needle template 301 and the lower needle template 303, the exposed two end structures of the probe 302 are more stable, effectively preventing the probe 302 from falling off during use or replacement.

[0036] The probe is composed of a body 3021, an upper needle head 3022 and a lower needle head 3023, wherein the ratio between the length of the body 3021 and the standard stroke of the probe is 4-6:1. The upper needle template 301 and the lower needle template 303 are in contact with each other, and a second step portion and a third step portion are respectively provided on one side of the first step through hole and the second step through hole. The part of the probe 302 that passes through the second step portion and the third step portion and is exposed to the outside is the visible portion 3024. The length of the body 3021 and the length of the visible portion 3024 are in a ratio of 1.5-3:1. Such a design not only enhances the robustness of the probe structure, but also effectively improves its tolerance to external pressure, and at the same time ensures that the user can clearly observe the working status of the probe. In addition, the ratio of the thickness of the upper needle template to the thickness of the lower needle template is 1:0.75-1.5. This design fully meets the accuracy and functionality requirements of the probe installation while reducing the thickness of the template as much as possible, and reduces the complexity and cost of processing and manufacturing. The length of the first section of the first stepped through hole in the upper needle template 301 is A, and the range of A is not greater than 0.3mm. The length of the second section is B, and the range of B is 1.5-6mm. The relationship between the thickness H1 of the second stepped portion of the upper needle template 301 and the thickness H2 of the upper needle template 301 is: H1=H2-AB; through the reasonable structural configuration of the thickness of the second stepped portion, the probe's ability to withstand external pressure and impact is enhanced, and the risk of damage is significantly reduced. In addition, by retaining an appropriate visible portion length, it is convenient to monitor the probe status in real time. The user can intuitively check whether the probe has a stuck needle phenomenon, whether the elastic performance is reduced, or whether there are burnt marks caused by the passage of large current, ensuring that any potential problems can be quickly discovered and effectively handled. Among them, the thickness configuration of the third step portion is considered in the same way.

[0037] In another implementation of the present application, the probe installation areas of the upper needle template 301 and the lower needle template 303 are respectively provided with a second step portion and a third step portion, and the second step portion and the third step portion enable the middle of the probe 302 to have a visible portion 3024 exposed to the outside, and the probe 302 includes a body portion 3021, an upper needle head portion 3022 and a lower needle head portion 3023, and the length of the body portion 3021 is 1.5-15 times the length of the visible portion 3024. Through the reasonable structural configuration of the exposed visible portion, the probe's ability to withstand external pressure and impact is enhanced, and the risk of damage is significantly reduced. In addition, by retaining an appropriate length of the visible portion, the real-time monitoring of the probe status is facilitated. The user can intuitively check whether the probe has a needle stuck phenomenon, whether the elastic performance is reduced, or whether there are burnt marks caused by the passage of large current, ensuring that any potential problems can be quickly discovered and effectively handled.

[0038] In another implementation of the present application, the thickness of the lower needle template 303 is 1.5-3 times the thickness of the upper needle template 301. The thickness of the upper and lower needle templates is designed to be as thin as possible, which effectively reduces the processing difficulty while adapting to the probe size.

[0039] The utility model effectively solves the problems of traditional test equipment taking a long time to cut the machine, shortening the life of the probe 302 due to frequent replacement, and needing to prepare a variety of pressure heads to meet different testing needs by switching different jig plates 4 or adjusting the position of their shielding parts. This innovation not only significantly improves production efficiency, but also reduces production costs and maintenance complexity. The jig plate 4, through its unique design of the mounting portion 401 and the positioning portion 402, can flexibly adapt to the layout of probes 302 of various specifications. The clever combination of the opening area 4021 and the shielding area 4022 ensures the precise contact between the probe 302 and the connector, and avoids unnecessary electrical interference. The stepped through-hole structure of the probe template 3 strengthens the fixing effect of the probe 302 in the template and prevents the probe 302 from loosening or falling off during use. The design in which the probe 302 is exposed to the outside after passing through the second step portion and the third step portion provides an intuitive observation window for the operator, so that the status of the probe 302 can be checked in real time, such as whether there is a stuck needle, weakened elastic force or burning black, etc., so as to timely discover and deal with the problem and ensure the accuracy of the test and the reliability of the equipment.

[0040] In summary, the utility model, through a series of innovative designs, not only solves the problems of traditional testing equipment in terms of cutting machine, probe 302 life and pressure head types, but also significantly improves production efficiency, operational convenience and equipment safety performance, bringing breakthrough progress to the testing field of electronic products such as liquid crystal display panels.

[0041] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A probe pressure head capable of quickly cutting a machine, characterized in that: The invention comprises a flexible circuit board (1), a mounting plate (2), a probe template (3) and a fixture plate (4), wherein the flexible circuit board (1) is fixed between the mounting plate (2) and the probe template (3), and the fixture plate (4) is mounted on a side of the probe template (3) away from the flexible circuit board (1); the fixture plate (4) comprises a mounting portion (401) and a positioning portion (402) located on one side of the mounting portion (401), wherein the positioning portion (402) corresponds to a probe (302) protruding from the probe template (3), and an opening area (4021) is provided on the positioning portion (402), and at least a part of the probe (302) is located in the opening area (4021).

2. The pressure head according to claim 1, characterized in that The positioning portion (402) comprises an opening area (4021) and at least one shielding area (4022); the probe (302) located in the opening area (4021) passes through the fixture plate (4); and the probe (302) located in the shielding area (4022) is shielded by the shielding area (4022) of the positioning portion (402).

3. The pressure head according to claim 2, characterized in that: The positioning parts (402) are arranged on both sides of the fixture plate (4) in opposite directions, and the positioning parts (402) on both sides respectively correspond to and adapt to probes (302) of two different specifications or arrangements; the specification range of the fixture plate (4) includes 50-96 probe pins.

4. The pressure head according to claim 2, characterized in that: The shielding area (4022) is an adjustable shielding member, and the size of the opening area (4021) is determined by the position of the shielding member; a mounting hole is provided on the mounting portion (401), and the fixture plate (4) is mounted on the probe template (3) through the mounting hole.

5. The pressure head according to claim 1, characterized in that: The probe template (3) comprises an upper needle template (301), a probe (302) and a lower needle template (303), wherein a first step portion is provided on one side of the lower needle template (303), wherein the first step portion is used for installing the upper needle template (301), and the two ends of the probe (302) are respectively installed in the preset through holes of the upper needle template (301) and the lower needle template (303).

6. The pressure head according to claim 1, characterized in that The probe template (3) comprises an upper needle template (301), a probe (302) and a lower needle template (303). The upper needle template (301) is evenly provided with a plurality of first step through holes for the probe (302) to pass through. The first step through holes are longitudinally divided into two sections with different diameters. The first section is located on a side away from the lower needle template (303), and the second section is located on a side close to the lower needle template (303). The diameter of the first section is smaller than the diameter of the second section. Second step through holes are respectively provided at positions corresponding to the first step through holes on the lower needle template (303). The second step through holes are longitudinally divided into two sections with different diameters. The third section is located on a side away from the upper needle template (301), and the fourth section is located on a side close to the upper needle template (301). The diameter of the third section is smaller than the diameter of the fourth section.

7. The pressure head according to claim 5 or 6, characterized in that: The upper needle template (301) is provided with a plurality of first mounting holes, and the lower needle template (303) is provided with matching second mounting holes at corresponding positions, and the first mounting holes and the second mounting holes are connected via a connecting piece.

8. The pressure head according to claim 5 or 6, characterized in that: The probe installation areas of the upper needle template (301) and the lower needle template (303) are respectively provided with a second step portion and a third step portion, and the second step portion and the third step portion enable the middle of the probe (302) to have a visible portion (3024) exposed to the outside, and the probe (302) includes a main body (3021), an upper needle head (3022) and a lower needle head (3023), and the length of the main body (3021) is 1.5-15 times the length of the visible portion (3024).

9. The pressure head according to claim 8, characterized in that The length of the first section of the first stepped through hole in the upper needle template (301) is A, and the range of A is not greater than 0.3 mm. The length of the second section is B, and the range of B is 1.5-6 mm. The relationship between the thickness H1 of the second stepped portion of the upper needle template (301) and the thickness H2 of the upper needle template (301) is: H1=H2-AB.

10. The pressure head according to claim 5, characterized in that The thickness of the lower needle template (303) is 1.5-3 times the thickness of the upper needle template (301).

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