Positioning jig for probe plate of laser resistor trimming machine

Abstract

A positioning jig for a probe plate of a laser resistor trimming machine is provided with a fixing platform for adsorbing and fixing the probe plate and a resistor substrate through negative pressure and a suction part for discharging welding waste gas, the suction part is vertically and fixedly assembled on the fixing platform, and the suction part is located above the fixing platform. The fixed platform is communicated with an external negative pressure device, and the suction part is communicated with an external suction and discharge pipe. The fixing platform is provided with a first fixing area used for fixing a probe plate and a second fixing area used for fixing a resistor substrate, and the second fixing area is located in the first fixing area. According to the positioning jig, the probe plate and the resistor substrate are fixed through negative pressure adsorption, waste gas generated during welding can be pumped away in time through the suction part, and the health of operators is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of preparation of a probe plate of a laser resistance trimming machine, in particular to a positioning fixture of a probe plate of a laser resistance trimming machine. Background Art

[0002] The laser resistor trimmer uses an extremely fine laser beam to hit thick and thin film resistors, and realizes the cutting of thick and thin film circuits by vaporizing and evaporating the resistor body. The laser beam cuts thick and thin film resistors according to the computer's preset program, and changes the resistance value of the resistor by changing the geometric shape of the thick and thin film resistors. As the laser cutting process proceeds, the probe board with multiple probes welded on it, such as China Patent Announcement No. CN217846412U, a resistance measuring tool for a laser resistor trimmer, measures the change in the resistance value of the thick and thin film resistors of the circuit substrate in real time, so that the resistance value of the thick and thin film resistors continues to approach the target resistance value. When the thick and thin film resistors reach the target resistance value, the laser beam is turned off, and the laser resistance trimming process is realized. The role of the spring probe in the laser resistor trimmer is to form a path between the measured resistor and the laser resistor trimmer so that the measured resistor can be trimmed by laser cutting.

[0003] The current method of making a probe board is to fix the circuit substrate to be measured, and then fix the probe board to be welded (pre-made PCB board) on the outside of the circuit substrate, and use solder to weld each tungsten steel needle one by one on the probe board according to the resistance position of the circuit substrate. After welding, the probe board can be directly installed and used in the resistance adjustment equipment. Because some resistance adjustment products require 100-200 spring probes, the welding time is long, and the circuit substrate and the probe board cannot be moved during the welding process. At present, there is no special probe board welding fixture. The circuit substrate and the probe board are mainly placed directly on a flat workbench for direct welding. This workbench has no fixed circuit substrate and probe board, and it is easy to shift during the welding process, affecting the welding accuracy.

[0004] Therefore, in view of the shortcomings of the prior art, it is necessary to provide a positioning fixture for a probe plate of a laser resistor trimming machine to solve the shortcomings of the prior art. Utility Model Content

[0005] The utility model aims to avoid the shortcomings of the prior art and provide a positioning fixture for a probe plate of a laser resistance trimming machine. The positioning fixture for the probe plate of a laser resistance trimming machine fixes the probe plate and the resistor substrate to improve welding accuracy.

[0006] The above-mentioned purpose of the utility model is achieved through the following technical measures:

[0007] Provided is a positioning jig for a probe board of a laser trimming machine, which is provided with a fixing platform for fixing the probe board and the resistor substrate by negative pressure adsorption and a suction part for discharging the welding waste gas. The suction part is vertically and fixedly assembled on the fixing platform, and the suction part is located above the fixing platform. The fixing platform is communicated with an external negative pressure device, and the suction part is communicated with an external suction and discharge pipe.

[0008] Preferably, the above-mentioned fixing platform is provided with a first fixing area for fixing the probe board and a second fixing area for fixing the resistor substrate, and the second fixing area is located inside the first fixing area.

[0009] Preferably, the above-mentioned fixing platform is provided with a housing, a vacuum tube for fixing the resistor substrate by negative pressure adsorption, a plurality of vacuum plates for fixing the probe board by negative pressure adsorption, and a transmission mechanism for expanding and gathering the vacuum plates centered on the vacuum tube. The vacuum tube is fixedly assembled in the housing, the transmission mechanism is assembled inside the housing, the vacuum plates are assembled with the transmission mechanism, and the vacuum plates are located outside the housing.

[0010] Preferably, the upper surface area of the above-mentioned vacuum tube serves as the second fixing area, and the area composed of all the vacuum plates serves as the second fixing area.

[0011] Preferably, the above-mentioned vacuum tube and the vacuum plates are communicated and are communicated with an external negative pressure device.

[0012] Preferably, the end of the above-mentioned vacuum tube is closed and provided with a plurality of first through holes.

[0013] Preferably, the upper surface of the above-mentioned vacuum plate is provided with a plurality of second through holes.

[0014] Preferably, the above-mentioned first through holes and the second through holes are both communicated with an external negative pressure device.

[0015] Preferably, there are three of the above-mentioned vacuum plates, and the three are divided around the vacuum tube with the center of the vacuum tube as the center of the circle. Among them, two vacuum plates are arranged opposite to each other and are defined as the first vacuum plates, and the other vacuum plate is defined as the second vacuum plate. The second vacuum plate is perpendicular to the two vacuum plates.

[0016] Preferably, the above-mentioned second vacuum plate is arranged opposite to the suction part.

[0017] Preferably, the above-mentioned transmission mechanism is provided with a gear ring, a plurality of wedge-shaped screws and a plurality of racks. The gear ring is assembled inside the housing, the wedge-shaped screws are rotatably assembled inside the housing, all the wedge-shaped screws are meshed with the gear ring, the racks are meshed with one of the wedge-shaped screws, and one rack is fixed to one vacuum plate.

[0018] Preferably, the number of the above-mentioned wedge-shaped screws, the number of the racks, and the number of the vacuum plates correspond to each other one by one.

[0019] Preferably, the above-mentioned vacuum tube is located inside the toothed ring.

[0020] Preferably, the above-mentioned suction part is provided with a plurality of suction holes, and the suction holes face the fixed platform.

[0021] A positioning fixture for a probe board of a laser trimming machine according to the present invention is provided with a fixed platform for fixing the probe board and the resistor substrate by negative pressure adsorption and a suction part for discharging welding waste gas. The suction part is vertically and fixedly assembled on the fixed platform, and the suction part is located above the fixed platform. The fixed platform is communicated with an external negative pressure device, and the suction part is communicated with an external suction and discharge pipe. The positioning fixture fixes the probe board and the resistor substrate by negative pressure adsorption, and can also timely suck away the waste gas generated during welding through the suction part to ensure the health of the operator. Description of the Drawings

[0022] The present invention is further described with reference to the accompanying drawings, but the content in the drawings does not constitute any limitation to the present invention.

[0023] Figure 1 It is a structural diagram of the positioning fixture for Embodiment 1.

[0024] Figure 2 It is a structural diagram of the positioning fixture for Embodiment 2.

[0025] Figure 3 It is a schematic structural diagram of the transmission mechanism when it is gathered.

[0026] Figure 4 It is a schematic structural diagram of the transmission mechanism when it is expanded.

[0027] In Figures 1 to 4 , including:

[0028] Fixed platform 100,

[0029] Shell 110,

[0030] Vacuum tube 120, first through hole 121,

[0031] Vacuum plate 130, second through hole 131,

[0032] Transmission mechanism 140, toothed ring 141, wedge-shaped screw 142, rack 143,

[0033] First fixed area 150, second fixed area 160,

[0034] Suction part 200, suction hole 210. Detailed implementation mode

[0035] The technical solution of the present utility model will be further described in conjunction with the following embodiments.

[0036] Embodiment 1

[0037] A positioning fixture for a probe board of a laser trimming machine, as Figure 1 shown, is provided with a fixing platform 100 for fixing the probe board and the resistor substrate by negative pressure adsorption and a suction part 200 for discharging the welding waste gas. The suction part 200 is vertically and fixedly assembled on the fixing platform 100, and the suction part 200 is located above the fixing platform 100. The fixing platform 100 is communicated with an external negative pressure device, and the suction part 200 is communicated with an external suction and discharge pipe.

[0038] It should be noted that the present utility model adsorbs and fixes the lower surfaces of the probe board and the resistor substrate. This adsorption force is uniform and it is not easy to damage the probe board and the resistor substrate. Compared with mechanical fixing, the present utility model adsorbs the lower surface without using tools such as clips for fixing, so it does not occupy the upper surface area of the probe board and the resistor substrate, and thus does not occupy the operation space.

[0039] The fixing platform 100 is provided with a first fixing area 150 for fixing the probe board and a second fixing area 160 for fixing the resistor substrate. The second fixing area 160 is located inside the first fixing area 150.

[0040] The suction part 200 of the present utility model is provided with a plurality of suction holes 210, and the suction holes 210 face the fixing platform 100. Through the above-mentioned suction holes 210, the waste gas generated during welding can be quickly sucked away.

[0041] This positioning fixture fixes the probe board and the resistor substrate by negative pressure adsorption, and can also suck away the waste gas generated during welding in time through the suction part 200, ensuring the health of the operator.

[0042] Embodiment 2

[0043] A positioning fixture for a probe board of a laser trimming machine, as Figure 2 shown, has the same other features as Embodiment 1, and also has the following technical features: the fixing platform 100 is provided with a housing 110, a vacuum tube 120 for fixing the resistor substrate by negative pressure adsorption, a plurality of vacuum plates 130 for fixing the probe board by negative pressure adsorption, and a transmission mechanism 140 for expanding and gathering the vacuum plates 130 with the vacuum tube 120 as the center. The vacuum tube 120 is fixedly assembled on the housing 110, the transmission mechanism 140 is assembled inside the housing 110, the vacuum plates 130 are assembled with the transmission mechanism 140, and the vacuum plates 130 are located outside the housing 110. Among them, the vacuum plate 130 is a hollow plate, and the vacuum plate 130 is communicated with an external negative pressure device.

[0044] The upper surface area of the vacuum tube 120 serves as the second fixing area 160, and the area composed of all the vacuum plates 130 serves as the second fixing area 160.

[0045] The vacuum tube 120 and the vacuum plates 130 are connected and are also connected to an external negative pressure device.

[0046] The end of the vacuum tube 120 is closed and is provided with a plurality of first through holes 121; the upper surface of the vacuum plate 130 is provided with a plurality of second through holes 131; both the first through holes 121 and the second through holes 131 are connected to the external negative pressure device.

[0047] There are three vacuum plates 130, which are divided around the center of the vacuum tube 120 and are arranged relative to the vacuum tube 120. Among them, two vacuum plates 130 are arranged opposite to each other and are defined as the first vacuum plates 130, and the other vacuum plate 130 is defined as the second vacuum plate 130. The second vacuum plate 130 is perpendicular to the two vacuum plates 130. The second vacuum plate 130 is arranged opposite to the suction part 200.

[0048] The transmission mechanism 140 is provided with a gear ring 141, a plurality of wedge-shaped screws 142 and a plurality of racks 143. The gear ring 141 is assembled inside the housing 110. The wedge-shaped screws 142 are rotatably assembled inside the housing 110. All the wedge-shaped screws 142 are engaged with the gear ring 141. One rack 143 is engaged with one wedge-shaped screw 142, and one rack 143 is fixed to one vacuum plate 130; the number of the wedge-shaped screws 142, the number of the racks 143 and the number of the vacuum plates 130 correspond one by one. The vacuum tube 120 is located inside the gear ring 141, as Figure 3 and Figure 4 .

[0049] It should be noted that the function of the transmission mechanism 140 of the present invention is to expand and gather the vacuum plates 130 simultaneously to fix probe plates of different sizes. When one of the vacuum plates 130 of the present invention is pushed, the corresponding wedge-shaped screw 142 of the vacuum plate 130 rotates accordingly, and then drives the gear ring 141 to rotate, thereby moving the other two vacuum plates 130.

[0050] In the present invention

[0051] Similar to Embodiment 1, in this embodiment, the vacuum plates 130 can be expanded and gathered, thereby fixing probe plates of different sizes.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit the protection scope of the present utility model. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present utility model.

Claims

1. A positioning fixture for a probe plate of a laser resistor trimming machine, characterized in that: A fixed platform for fixing the probe plate and the resistor substrate by negative pressure adsorption and a suction part for discharging welding waste gas are provided. The suction part is vertically fixedly assembled on the fixed platform, and the suction part is located above the fixed platform. The fixed platform is connected to an external negative pressure device, and the suction part is connected to an external suction and exhaust pipe.

2. The positioning fixture for the probe plate of the laser resistor trimming machine according to claim 1, characterized in that: The fixing platform is provided with a first fixing area for fixing the probe card and a second fixing area for fixing the resistor substrate, and the second fixing area is located inside the first fixing area.

3. The positioning fixture for the probe plate of the laser resistor trimming machine according to claim 2, characterized in that: The fixed platform is provided with a shell, a vacuum tube for fixing the resistor substrate by negative pressure adsorption, a plurality of vacuum plates for fixing the probe plate by negative pressure adsorption, and a transmission mechanism for carrying the vacuum plates to expand and gather around the vacuum tube as the center, the vacuum tube is fixedly assembled on the shell, the transmission mechanism is assembled inside the shell, the vacuum plate is assembled with the transmission mechanism, and the vacuum plate is located outside the shell; The upper surface area of ​​the vacuum tube serves as the second fixing area, and the area formed by all the vacuum panels serves as the second fixing area.

4. The positioning fixture for the probe plate of the laser resistor trimming machine according to claim 3, characterized in that: The vacuum tube is in communication with the vacuum plate and is also in communication with an external negative pressure device.

5. The positioning fixture for the probe plate of the laser resistor trimming machine according to claim 4, characterized in that: The end of the vacuum tube is closed and provided with a plurality of first through holes; The upper surface of the vacuum plate is provided with a plurality of second through holes; The first through hole and the second through hole are both communicated with an external negative pressure device.

6. The positioning fixture for the probe plate of the laser resistor trimming machine according to claim 5, characterized in that: The vacuum plates are provided with three pieces, and the three pieces are divided into the vacuum tube with the center of the vacuum tube as the center of the circle, and two of the vacuum plates are arranged opposite to each other and are defined as the first vacuum plates, and the other vacuum plate is defined as the second vacuum plate, and the second vacuum plate is perpendicular to the two vacuum plates.

7. The positioning fixture for the probe plate of the laser resistor trimming machine according to claim 6, characterized in that: The second vacuum plate is arranged opposite to the suction part.

8. The positioning fixture for the probe plate of the laser resistor trimming machine according to claim 7, characterized in that: The transmission mechanism is provided with a gear ring, a plurality of wedge-shaped screws and a plurality of racks, the gear ring is assembled inside the housing, the wedge-shaped screws are rotatably assembled inside the housing, all the wedge-shaped screws are meshed with the gear ring, the rack is meshed with one of the wedge-shaped screws, and one rack is fixed to a vacuum plate; The number of the wedge screws, the number of the racks and the number of the vacuum plates correspond one to one.

9. The positioning fixture for the probe plate of the laser resistor trimming machine according to claim 8, characterized in that: The vacuum tube is located inside the gear ring.

10. The positioning fixture for the probe plate of a laser resistor trimming machine according to any one of claims 1 to 9, characterized in that: The suction portion is provided with a plurality of suction holes, and the suction holes face the fixing platform.

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