Knife type low-resistance test needle

Abstract

The utility model discloses a knife-type low-resistance test needle which comprises a needle seat, a test blade is arranged on the needle seat, the test blade is connected with the needle seat through an elastic mechanism, and a pressure detection mechanism used for detecting deformation of the elastic mechanism and carrying out stress detection on the test blade is arranged on the needle seat. According to the utility model, the deformation of the elastic plastic card is detected by using the change of the light intensity received by the photosensitive sensor, so that the pressure borne by the probe during detection can be accurately controlled, and the detection accuracy is ensured; and meanwhile, the probe adopts a knife-shaped structure, and the surface of the probe is coated with a nano coating, so that the problem of short circuit of the probe tip can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of flying probe testers, and particularly relates to a knife-shaped low-resistance test probe. Background Art

[0002] When testing a circuit board, it is necessary to use a probe for conduction testing. During the test, the probe needs to be moved into contact with the circuit board. Therefore, it is necessary to detect the probe pressure to avoid probe damage or damage to the circuit board. Existing probes generally adopt a spring-type telescopic structure and are equipped with a pressure sensor for pressure detection; the detection life is affected by the deformation performance of the spring itself, and the detection accuracy cannot be accurately guaranteed, and it is easy to cause scratch damage on the product surface due to overpressure; at the same time, the conventional columnar probe structure is also prone to the problem of tip short circuit, affecting the accuracy of the test results. Summary of the Utility Model

[0003] Technical Objective: Aiming at the deficiencies of the existing probe structure, the utility model discloses a knife-shaped low-resistance test probe that can avoid tip short circuit during testing and can accurately detect pressure.

[0004] Technical Solution: To achieve the above technical objective, the utility model adopts the following technical solution:

[0005] A knife-shaped low-resistance test probe includes a needle base, and a test blade is provided on the needle base. The test blade is connected to the needle base through an elastic mechanism, and a pressure detection mechanism for detecting the force on the test blade by detecting the deformation of the elastic mechanism is provided on the needle base.

[0006] Preferably, the elastic mechanism of the utility model includes an elastic plastic card. One end of the elastic plastic card is connected to the needle base through a fixed seat, and the other end is connected to the test blade. During the test, the force on the test blade causes the elastic plastic card to deform, and after the force disappears, the test blade is driven to reset by the elastic plastic card.

[0007] Preferably, the pressure detection mechanism of the utility model includes a photosensitive sensor. When the elastic plastic card deforms, the light intensity reaching the photosensitive sensor changes to monitor the pressure on the test blade.

[0008] Preferably, the photosensitive sensor of the utility model is installed on the needle base through a sensor fixing bracket. The sensor fixing bracket is slidably arranged on the needle base along the deformation direction of the elastic plastic card when it deforms, and an adjusting bolt for adjusting the position of the sensor fixing bracket is provided on the needle base.

[0009] Preferably, a buckle for pressing and fixing the sensor signal wire is provided on the sensor fixing bracket of the utility model, and both ends of the buckle are fixedly connected to the sensor fixing bracket through screws.

[0010] Preferably, the number of test blades fixed on each elastic plastic card of the present utility model is two groups, and nano - coatings are applied on the surfaces of the test blades close to each other.

[0011] Preferably, the lower end of the test blade of the present utility model is inclined, forming an angle with the direction in which the test needle seat drives the test blade to move downward. After the end of the test blade extends into the test hole, the lower edge of the test blade contacts and conducts with the copper sheet in the test hole.

[0012] Beneficial effects: The knife - type low - resistance test needle provided by the present utility model has the following beneficial effects:

[0013] 1. The probe of the present utility model adopts a knife - type structure and a nano - coating is sprayed on the surface, so that the insulation between the blades can be achieved, avoiding the problem of tip short - circuit and ensuring the accuracy of the detection results.

[0014] 2. The present utility model uses the change in light intensity received by the photosensitive sensor to detect the deformation of the elastic plastic card, so that the pressure on the probe during detection can be accurately controlled, ensuring the accuracy of the detection. At the same time, the test blade is clamped on the elastic plastic card, and different precision pressure controls can be achieved by changing the elastic deformation performance of the elastic plastic card. The greater the deformation under unit pressure, the higher the detection precision that can be achieved. In actual use, the corresponding elastic material can be selected by comprehensively considering the material's resilience ability and the detection precision requirements.

[0015] 3. The photosensitive sensor of the present utility model is slidably arranged on the needle seat, and the relative position between the photosensitive sensor and the elastic plastic card can be adjusted by the adjusting bolt. Thus, for the same elastic plastic card, different pressure precision controls can be achieved.

[0016] 4. A buckle is arranged on the sensor fixing bracket of the present utility model, and the signal wire is tightly fixed through the buckle. Thus, during movement, the influence of signal wire pulling on the sensor can be avoided, and the service life of the device can also be improved.

[0017] 5. The lower end of the test blade of the present utility model is inclined. When the copper sheet is lower than the surface of the test product, the conduction between the test blade and the copper sheet can be maintained by changing the inclination angle, ensuring the test effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0020] Figure 2Explosion diagram of the structure of the present utility model;

[0021] Figure 3 Schematic diagram of the present utility model using a test blade to detect a test hole;

[0022] Among them, 1 - needle seat, 2 - test blade, 3 - elastic plastic card, 4 - fixed seat, 5 - photosensitive sensor, 6 - sensor fixing bracket, 7 - adjusting bolt, 8 - sensor signal wire, 9 - buckle, 10 - screw, 11 - adjusting nut, 12 - copper sheet. Detailed implementation manners

[0023] Now, reference will be made in detail to the embodiments of the present disclosure, one or more examples of which are set forth below in this text. Each embodiment and example is provided by way of explaining the devices, components, and materials of the present disclosure, rather than limiting. On the contrary, the following description provides a convenient illustration for implementing the exemplary embodiments of the present disclosure. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the teachings of the present disclosure without departing from the scope or spirit of the present disclosure. For example, features shown or described as part of one embodiment can be combined with another embodiment to yield yet another embodiment. It is intended that the present disclosure cover such modifications and variations that fall within the scope of the appended claims and their equivalents. Other objects, features, and aspects of the present disclosure are disclosed or will be apparent from the following detailed description. It is to be understood by those of ordinary skill in the art that this discussion is only a description of exemplary embodiments and is not intended to limit the broader aspects of the present disclosure.

[0024] As Figure 1 and Figure 2 shown, a knife-type low-resistance test needle disclosed by the present utility model includes a needle seat 1, and a test blade 2 is provided on the needle seat 1. The number of test blades 2 fixed on each elastic plastic card 3 is two groups, so as to form a loop when testing and conducting with the test object. The test blades 2 are coated with a nano-coating on the adjacent surfaces to avoid short-circuit of the needle tip; the test blade 2 is connected to the needle seat 1 through an elastic mechanism, and a pressure detection mechanism for detecting the deformation of the elastic mechanism to detect the force on the test blade 2 is provided on the needle seat 1.

[0025] In a specific embodiment, the elastic mechanism of the present utility model includes an elastic plastic card 3. One end of the elastic plastic card 3 is connected to the needle seat 1 through a fixed seat 4, and the other end is connected to the test blade 2. When testing, the force on the test blade 2 causes the elastic plastic card 3 to deform, and after the force disappears, the test blade is driven to reset by the elastic plastic card 3.

[0026] For the convenience of monitoring the deformation of the elastic plastic card 3, the pressure detection mechanism of the present utility model includes a photosensitive sensor 5. When the elastic plastic card 3 deforms, the light intensity reaching the photosensitive sensor 5 changes, so as to monitor the pressure received by the test blade 2. Since the elastic modulus of the elastic plastic card 3 remains unchanged after the material is determined, by monitoring the deformation size of the elastic plastic card 3, the accurate detection and control of the pressure can be realized; the pressure detection can also be adjusted by adjusting the distance between the elastic plastic card 3 in the initial state and the detection end of the photosensitive sensor to meet the use requirements in different pressure detection demand scenarios.

[0027] Specifically, the photosensitive sensor 5 of the present utility model is installed on the needle base 1 through a sensor fixing bracket 6. The sensor fixing bracket 6 is slidably arranged on the needle base 1 along the deformation direction when the elastic plastic card 3 deforms. An adjusting bolt 7 for adjusting the position of the sensor fixing bracket 6 is arranged on the needle base 1, and an adjusting nut 11 matched with the adjusting bolt 7 is arranged on the needle base 1. The adjusting bolt 7 is threadedly connected with the adjusting nut 11 and is rotatably connected to the sensor fixing bracket 6. By rotating the adjusting bolt 7, the position of the sensor fixing bracket 6 on the needle base 1 can be changed.

[0028] At the same time, to ensure that during the moving adjustment process, the signal of the sensor can be stably transmitted, and to avoid the signal line and the sensor being pulled against each other during movement, resulting in signal disconnection, a buckle 9 for tightly fixing the sensor signal line 8 is arranged on the sensor fixing bracket 6 of the present utility model. Both ends of the buckle 9 are fixedly connected to the sensor fixing bracket 6 through screws 10.

[0029] When the low-resistance test needle provided by the present utility model is in use, first adjust the relative position of the photosensitive sensor 5 on the sensor fixing bracket 6 and the elastic plastic card 3 through the adjusting bolt 7 according to the pressure detection requirement to control the accuracy. After confirming the distance, install the test needle on the testing machine, and the testing machine drives the test needle to move to conduct a conduction test on the circuit board. To achieve Figure 3In the case of small and medium apertures, the contact position of the copper sheet 12 is lower than the detection of the detection surface, ensuring that the test blade 2 can contact the copper sheet. The lower end of the test blade 2 of the present utility model is inclined, forming an angle with the direction of the test needle seat driving the test blade 2 to move downward. After the end of the test blade 2 extends into the test hole, the lower edge of the test blade 2 contacts and conducts with the copper sheet in the test hole. The inclination angle of the lower end of the test blade 2 can be adjusted as needed. Moreover, the conduction method of the present utility model can avoid the problem of the probe breaking due to being too thin in the traditional use of the probe for detection; during the detection process, when the end of the test blade 2 contacts the circuit board, the elastic plastic card 3 will deform under force. When the deformation position reaches the detection point of the photosensitive sensor 5, it causes a change in the light intensity received by the light surface sensor 5 and converts the change into an electrical signal and transmits it to the control end of the testing machine. Based on this, it can be judged that the elastic plastic card 3 is deformed in place and the pressure between the test blade 2 and the circuit board reaches the set value. After the test is completed, the test blade 2 is separated from the circuit board, and the elastic plastic card 3 rebounds to drive the test blade 2 to reset, and the detection of the next position can be carried out.

Claims

1. A knife-shaped low-resistance test needle, characterized in that: The needle seat (1) comprises a needle seat (1), on which a test blade (2) is arranged, the test blade (2) and the needle seat (1) are connected via an elastic mechanism, and a pressure detection mechanism is arranged on the needle seat (1) for detecting deformation of the elastic mechanism and performing force detection on the test blade (2).

2. A knife-shaped low-resistance test needle according to claim 1, characterized in that: The elastic mechanism comprises an elastic plastic card (3), one end of the elastic plastic card (3) being connected to the needle seat (1) via a fixing seat (4), and the other end being connected to the test blade (2); when the test blade (2) is subjected to force during testing, the elastic plastic card (3) is deformed, and after the force disappears, the test blade is driven to reset via the elastic plastic card (3).

3. A knife-shaped low-resistance test needle according to claim 2, characterized in that: The pressure detection mechanism comprises a photosensitive sensor (5). When the elastic plastic card (3) is deformed, the intensity of light reaching the photosensitive sensor (5) changes, thereby monitoring the pressure exerted on the test blade (2).

4. A knife-shaped low-resistance test needle according to claim 3, characterized in that: The photosensitive sensor (5) is mounted on the needle seat (1) via a sensor fixing bracket (6); the sensor fixing bracket (6) is slidably arranged on the needle seat (1) along the deformation direction of the elastic plastic card (3) when it is deformed; and an adjusting bolt (7) for adjusting the position of the sensor fixing bracket (6) is arranged on the needle seat (1).

5. A knife-shaped low-resistance test needle according to claim 4, characterized in that: The sensor fixing bracket (6) is provided with a pressing buckle (9) for pressing and fixing the sensor signal line (8), and two ends of the pressing buckle (9) are fixedly connected to the sensor fixing bracket (6) by screws (10).

6. The knife-shaped low-resistance test needle according to claim 1, characterized in that: The number of test blades (2) fixed on each elastic plastic card (3) is two groups, and the test blades (2) are coated with a nano coating on adjacent surfaces.

7. A knife-shaped low-resistance test needle according to any one of claims 1 to 6, characterized in that: The lower end of the test blade (2) is arranged obliquely to form an angle with the direction in which the needle seat drives the test blade (2) to move downward during testing. After the end of the test blade (2) extends into the test hole, the lower edge of the test blade (2) contacts and conducts with the copper sheet in the test hole.

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