A coaxial diode PIND fixture device

Abstract

The utility model provides a coaxial diode PIND fixture device, comprising: a main body base, provided with a first positioning cavity, a second positioning cavity and a first arc-shaped surface, the first positioning cavity and the second positioning cavity are respectively located on opposite sides of the first arc-shaped surface, the first arc-shaped surface is used to support the ceramic cavity of the coaxial diode, the first positioning cavity and the second positioning cavity are respectively used to accommodate the cap and the base end of the coaxial diode; a fixed pressure plate, used to be installed on the main body base, the fixed pressure plate is provided with a second arc-shaped surface, the second arc-shaped surface and the first arc-shaped surface jointly clamp the ceramic cavity of the coaxial diode. The utility model can improve the PIND test precision and accuracy of the coaxial diode.

Description

Technical Field

[0001] The utility model relates to the field of microelectronic device testing, in particular to a coaxial diode device PIND fixture device. Background Art

[0002] The PIND (Particle Impact Noise Detection) test is a test method to detect whether there are movable free particles inside the device. It is used to eliminate failed devices that introduce redundant objects during the process of assembly, storage, transportation, testing and packaging of the device. It is a non-destructive test to improve the reliability of the device.

[0003] As an active device with a cylindrical cavity, the coaxial diode is mentioned in the installation requirements of GJB548C-2005 Method 2020.2 and GJB128B-2021 Method 2052 that small cylindrical devices with axial leads should be installed with their axes horizontally, with the side of the cylinder facing the sensor.

[0004] The installation method described in the standard does not specify how to install the parallel coupling on the sensor table to obtain the best detection sensitivity. Generally, the coaxial diode cap diameter and the bottom electrode diameter have various specifications, but there is at least one diameter that is larger than the diameter of the ceramic cylindrical cavity. The device will be tilted at an angle on the PIND sensor table and will no longer be parallel. This tilt will result in the particle signal not being able to be transmitted vertically downward when the particles collide in the cavity. At the same time, the tilt also leads to a small contact area between the device and the sensor table, unstable bonding, and the device is prone to random jumping during vibration and impact, gradually shifting the sensor center monitoring sensitive area. These deficiencies affect the precision and accuracy of the PIND test. Summary of the invention

[0005] The utility model aims to solve the problem that the coaxial diode is installed tilted and the bonding is not firm during the PIND test, which leads to low PIND test precision and accuracy. The utility model is realized by the following technical solutions and devices.

[0006] The technical solution of this utility model:

[0007] A coaxial diode PIND fixture device, comprising:

[0008] The main body base is provided with a first positioning cavity, a second positioning cavity and a first arc-shaped surface, wherein the first positioning cavity and the second positioning cavity are respectively located on opposite sides of the first arc-shaped surface, the first arc-shaped surface is used to support the ceramic cavity of the coaxial diode, and the first positioning cavity and the second positioning cavity are respectively used to accommodate the sealing cap and the base end of the coaxial diode;

[0009] A fixed pressing plate is used for being installed on the main body base. The fixed pressing plate is provided with a second arc-shaped surface. The second arc-shaped surface and the first arc-shaped surface jointly clamp the ceramic cavity of the coaxial diode.

[0010] Furthermore, a first slide groove and a second slide groove are respectively provided on opposite sides of the main body base;

[0011] The fixed pressing plate comprises:

[0012] The horizontal part of the pressure plate;

[0013] A first insertion arm, provided at one end of the horizontal portion of the pressing plate, and slidably inserted into the first sliding groove;

[0014] The second insertion arm is arranged at the other end of the horizontal portion of the pressing plate and can be slidably inserted into the second sliding groove.

[0015] Furthermore, the coaxial diode PIND fixture device further comprises:

[0016] A fixing member is used to lock the fixed pressure plate to the main body base.

[0017] Furthermore, the arc length of the first arc-shaped surface is less than or equal to half of the circumference of the ceramic cavity of the coaxial diode, and the arc length of the second arc-shaped surface is less than the arc length of the first arc-shaped surface.

[0018] Furthermore, a distance between a chord corresponding to the arc of the first arc-shaped surface and a chord corresponding to the arc of the second arc-shaped surface is 1 / 3 to 1 / 4 of a diameter of a ceramic cavity of the coaxial diode.

[0019] Furthermore, the first curved surface is coated with hydrosol.

[0020] Furthermore, the coaxial diode PIND fixture device also includes

[0021] An auxiliary pad is provided with a screw hole for threaded connection with the coaxial diode;

[0022] A plurality of metal plates are used to support the auxiliary pads and the sealing cap of the coaxial diode. The smaller device in the PIND failure waveform can be determined by adjusting the thickness of the metal plates.

[0023] Furthermore, the depth of the first insertion arm inserted into the first slide groove and the second insertion arm inserted into the second slide groove is the sum of the thickness of the metal plate that can just detect the smaller device in the PIND failure waveform plus the radius of the cylindrical ceramic cavity of the coaxial diode device, and a negative tolerance is taken.

[0024] Advantages of the utility model: the coaxial diode PIND fixture device provided by the utility model increases the transmission area of ​​the particle signal, ensures that the parallelism between the coaxial diode and the PIND vibration impact table remains unchanged, improves the PIND test precision and accuracy of the coaxial diode, avoids false alarms and misjudgments under conventional methods, and improves the product quality control level. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a flow chart of the PIND fixture design according to an embodiment of the present utility model.

[0026] Figure 2 This is a schematic diagram of the assembly and decomposition of the PIND clamp according to an embodiment of the utility model.

[0027] Figure 3 This is a schematic diagram of the completed assembly of the PIND clamp according to an embodiment of the utility model.

[0028] Figure 4 Schematic diagram of the completed assembly of the PIND fixture for small-size coaxial diodes.

[0029] Figure 5 Schematic diagram of the assembly explosion between the coaxial diode and the auxiliary spacer.

[0030] Figure 6 This is a schematic diagram of the assembly between the coaxial diode and the auxiliary spacer.

[0031] Figure 7 This is a diagram of the PIND test process using the PIND fixture.

[0032] Figure 8 yes Figure 7 main view.

[0033] In the figure: 1-main body base, 2-fixed pressure plate, 3-slotted cylindrical head screw, 4-auxiliary pad, 5-coaxial diode base end, 6-coaxial diode cap, 7-horizontal part of the pressure plate, 8-first insertion arm, 9-second insertion arm, 10-second arc surface, 11-countersunk through hole, 12-first positioning cavity, 13-first arc surface, 14-second positioning cavity, 15-threaded hole, 16-first slide groove, 17-second slide groove, 18-coaxial diode device, 19-small size coaxial diode PIND fixture, 20-metal gasket, 21-sensor, 22-vibration table. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, the present disclosure can be implemented in various forms and should not be limited by the embodiments described. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] Figure 1 A flow chart showing the application of the fixture provided by the utility model to the design of a coaxial diode PIND fixture; Figure 2 is an assembly exploded diagram of the coaxial diode PIND fixture device, Figure 3 This is a schematic diagram of the assembly of the coaxial diode PIND fixture device. Figure 4 Schematic diagram of the assembly of the small-size coaxial diode PIND fixture. Figure 5 is a schematic diagram of the assembly breakdown between the coaxial diode and the auxiliary spacer, Figure 6 is a schematic diagram of the coaxial diode and the auxiliary spacer after assembly, Figure 7 This is a diagram of the PIND test process using the PIND fixture.

[0036] The utility model discloses a coaxial diode device PIND fixture design method and device, which is mainly divided into the following parts:

[0037] Fixture Design Process

[0038] like Figure 1 As shown, use auxiliary pads to complete PIND batch screening → screen out PIND failed devices with smaller waveforms. Use auxiliary pads to fill metal plates and screen out PIND failed devices with smaller waveforms → PIND test. PIND test passed → thin metal plates → PIND test. PIND test failed → thicken metal plates → PIND test. Determine the thickness of the main base to complete the design → make a fixture for PIND test.

[0039] The implementation steps are to install the auxiliary pad 4 on the PIND vibration impact table using a hydrosol or film, select a batch of coaxial diode products for PIND test, and screen out the smaller devices in the PIND failure waveform. By thickening or thinning the metal plate 20 under the auxiliary pad 4, the upper surface of the metal plate 20 and the lower surface of the auxiliary pad 4 and the maximum outer diameter of the coaxial diode cap 6 fit together and are in a horizontal position. The total length of the coaxial diode device 18 and the auxiliary pad 4 after assembly is less than the maximum length of the metal plate 20. The metal plate 20 is placed in the center of the PIND equipment vibration impact table as much as possible.

[0040] The thickness of the metal plate 20 can be increased or decreased by processing metal plates of different thicknesses or by stacking and combining metal plates of different thicknesses. Find a thickness of the metal plate 20 that can just detect the smaller device in the PIND failure waveform, add this thickness to the sum of the radius of the cylindrical ceramic cavity of the coaxial diode device 18, and take the negative tolerance as the insertion depth of the insertion arm 8 and the insertion arm 9.

[0041] In order to increase the particle signal transmission area of ​​the coaxial diode in the fixture, the first curved surface 13 on the main base 1 in the fixture device and the second curved surface 10 on the fixed pressure plate 2 can be continuously tightened and pulled closer through the screws 3 and the threaded holes 15 in the two through holes 11 on the horizontal part 7 of the pressure plate, and finally the ceramic cavity part of the coaxial diode device 18 is clamped tightly.

[0042] The arc length of the first arc surface 13 is less than or equal to half of the circumference of the ceramic cavity of the coaxial diode device 18, and the arc length of the second arc surface 10 is less than the arc length of the first arc surface 13. The distance between the chord corresponding to the arc of the first arc surface 13 and the chord corresponding to the arc of the second arc surface 10 is controlled to be 1 / 3 to 1 / 4 of the diameter of the ceramic cavity of the coaxial diode device 18. By dripping a thin layer of hydrosol on the first arc surface 13, the fit between the ceramic cavity and the fixture is further improved.

[0043] In order to keep the coaxial diode always level with the PIND table during the clamping process, so as not to be clamped off-center. The first insertion arm 8 and the second insertion arm 9 of the horizontal part of the pressure plate should be as long as possible, and the insertion arms should act as vertical guide rails. However, there should be a gap of 0.1mm~0.2mm from the table to prevent the entire fixture from being lifted up due to the insertion arm being too long when it is installed on the PIND vibration impact table, resulting in a reduction in the contact area between the fixture and the table or even non-parallelism. The tolerance of each side of the first insertion arm 8 and the second insertion arm 9 and the first slide groove 16 and the second slide groove 17 should be controlled within 0.05mm.

[0044] The coaxial diode device 18 is precisely mounted on the main body base 1 through the first positioning cavity 12, the second positioning cavity 14 and the first arc surface 13. The first positioning cavity 12 is in the shape of a square groove hole, the upper edge of the groove is in contact with the top edge of the coaxial diode device cap 6, and the lower edge of the groove is in contact with the bottom edge of the coaxial diode cap 6. The second positioning cavity 14 is in the shape of a square groove, and the lower edge of the groove is in contact with the bottom edge of the coaxial diode base end 5. The first arc surface 13 is in contact with the ceramic cavity of the coaxial diode device 18.

[0045] In order to fix the product tightly, slowly place the first insertion arm 8 and the second insertion arm 9 on the fixed pressure plate 2 into the first slide groove 16 and the second slide groove 17 on both sides of the main base, let them fall freely and let the second curved surface 10 on the fixed pressure plate 2 contact the product, tighten the two screws 3 in the horizontal part 7 of the pressure plate, and complete the sample fixation.

[0046] The auxiliary pad is a slider, the middle part of which is provided with a threaded hole with a thread, and the base end of the product is fixed by screws. The height of the slider is the maximum outer dimension of the product.

[0047] In order to ensure that the fixture has good sound-conducting properties and rigidity, the main base 1, the fixed pressure block 2, and the auxiliary cushion block 4 of the fixture device are all made of 7075 aluminum alloy material.

[0048] For a coaxial diode with too small dimensions, the device is light enough, and the PIND fixture can only retain the structure of the first arc-shaped surface 13, while the fastening between the fixture can be completed by hydrosol.

[0049] The PIND fixture design method and device provided by this patent improves the PIND test precision and accuracy of coaxial diodes, avoids false alarms and misjudgments under conventional methods, and improves the product quality control level.

[0050] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A coaxial diode PIND fixture device, characterized in that: include: The main body base is provided with a first positioning cavity, a second positioning cavity and a first arc-shaped surface, wherein the first positioning cavity and the second positioning cavity are respectively located on opposite sides of the first arc-shaped surface, the first arc-shaped surface is used to support the ceramic cavity of the coaxial diode, and the first positioning cavity and the second positioning cavity are respectively used to accommodate the sealing cap and the base end of the coaxial diode; A fixed pressing plate is used for being installed on the main body base. The fixed pressing plate is provided with a second arc-shaped surface. The second arc-shaped surface and the first arc-shaped surface jointly clamp the ceramic cavity of the coaxial diode.

2. The coaxial diode PIND fixture device according to claim 1, characterized in that: The main body base is provided with a first slide groove and a second slide groove on opposite sides thereof; The fixed pressing plate comprises: The horizontal part of the pressure plate; A first insertion arm, provided at one end of the horizontal portion of the pressing plate, and slidably inserted into the first sliding groove; The second insertion arm is arranged at the other end of the horizontal portion of the pressing plate and can be slidably inserted into the second sliding groove.

3. The coaxial diode PIND fixture device according to claim 2, characterized in that: The coaxial diode PIND fixture device also includes: A fixing member is used to lock the fixed pressure plate to the main body base.

4. The coaxial diode PIND fixture device according to claim 1, characterized in that: The arc length of the first arc-shaped surface is less than or equal to half of the circumference of the ceramic cavity of the coaxial diode, and the arc length of the second arc-shaped surface is less than the arc length of the first arc-shaped surface.

5. The coaxial diode PIND fixture device according to claim 4, characterized in that: The distance between the chord corresponding to the arc of the first arc-shaped surface and the chord corresponding to the arc of the second arc-shaped surface is 1 / 3 to 1 / 4 of the diameter of the ceramic cavity of the coaxial diode.

6. The coaxial diode PIND fixture device according to claim 1, characterized in that: The first curved surface is coated with hydrosol.

7. The coaxial diode PIND fixture device according to claim 2, characterized in that: The coaxial diode PIND fixture device also includes An auxiliary pad, provided with a screw hole for threaded connection with the coaxial diode; A plurality of metal plates are used to support the auxiliary pads and the sealing cap of the coaxial diode. The smaller device in the PIND failure waveform can be determined by adjusting the thickness of the metal plates.

8. The coaxial diode PIND fixture device according to claim 7, characterized in that: The depth of the first insertion arm inserted into the first slide groove and the second insertion arm inserted into the second slide groove is the sum of the thickness of the metal plate that can just detect the smaller device in the PIND failure waveform plus the radius of the cylindrical ceramic cavity of the coaxial diode, and a negative tolerance is taken.

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