A clamping fixture for restoring the polarity of a laser semiconductor diode

Abstract

The utility model discloses a clamping jig for restoring the polarity of a laser semiconductor diode, and relates to the technical field of laser semiconductor diode manufacturing. The utility model provides a base groove on one side of the top surface of the jig, one end of the base groove fixes a left terminal, and a laser semiconductor device is placed in the base groove, and a slide rail is provided on the other side of the top surface of the jig, a slider is provided on the slide rail, and a right terminal is provided on the slider; when in use, one side of a laser semiconductor chip of the laser semiconductor device is made to be in close contact with the left terminal, the slider is slid so that one end of the right terminal is in close contact with the laser semiconductor device, and a reverse voltage is applied between the left terminal and the right terminal, and the applied voltage is controlled by the slidable right terminal to have multiple contact times with the laser semiconductor device, so that the forward polarity of the laser semiconductor device is restored, and the problem of a reduced forward voltage value or a forward conduction short circuit of the semiconductor device caused by the material itself and the process temperature is offset.

Description

Technical Field

[0001] The utility model relates to the technical field of laser semiconductor diode manufacturing, in particular to a clamping fixture for restoring the polarity of a laser semiconductor diode. Background Art

[0002] Semiconductor lasers have developed rapidly due to their wide wavelength range, simple production, low cost, easy mass production, small size, light weight, and long life. They are widely used in laser medical treatment, laser beauty, laser communication, optical storage, laser printing, laser ranging, radar and other fields. With the development of the laser semiconductor field and the increase in market demand, the localization speed of laser semiconductor chips has accelerated. Due to the high process control temperature, the chip package is welded with hard solder, which usually causes abnormal forward voltage of laser semiconductors during the manufacturing process, resulting in an increase in the defective rate during the production process.

[0003] The technology currently used is to directly apply a large forward current to change the carrier concentration inside the laser semiconductor device and restore it to its normal blocking state, that is, to restore the unidirectional conductivity of the semiconductor device; however, due to the semiconductor device material itself and the process temperature, the carrier concentration changes, causing the forward voltage value of the laser semiconductor device to decrease or a short circuit to occur during testing. Utility Model Content

[0004] The embodiment of the utility model provides a clamping fixture for restoring the polarity of a laser semiconductor diode, which can solve the problem in the prior art that the forward voltage value of the laser semiconductor device is reduced or a short circuit occurs during testing due to changes in the carrier concentration caused by the semiconductor device material itself and the process temperature.

[0005] The utility model provides a clamping fixture for restoring the polarity of a laser semiconductor diode, comprising a fixture, a base groove is provided on one side of the top surface of the fixture, a left terminal is fixed on one end of the base groove, a laser semiconductor device can be placed in the base groove, and one side of the laser semiconductor chip of the laser semiconductor device is connected to the left terminal;

[0006] A slide rail is arranged on the other side of the top surface of the fixture, a slider is slidably arranged on the slide rail, a right terminal is horizontally arranged on the slider, and the slider can slide on the slide rail so that one end of the right terminal can be connected to the laser semiconductor device.

[0007] Preferably, the aluminum nitride ceramic sheet of the laser semiconductor device is in close contact with the inner bottom surface of the base groove.

[0008] Preferably, the side of the laser semiconductor chip of the laser semiconductor device is in contact with the side of the tungsten copper electrode of the laser semiconductor device;

[0009] The aluminum nitride ceramic sheet is in contact with the bottom side of the tungsten copper electrode of the laser semiconductor device.

[0010] Preferably, the other end of the left terminal is connected to the positive electrode of the CNC power supply, and the other side of the right terminal is connected to the negative electrode of the CNC power supply.

[0011] Preferably, when the slider slides on the slide rail, the right terminal can slide in the groove of the base and enable one end of the right terminal to be connected to the laser semiconductor device.

[0012] Preferably, the position of the base groove on the top surface of the jig is higher than the position of the slide rail on the top surface of the jig.

[0013] Preferably, the left binding post and the right binding post are powered on for 1 to 2 seconds each time.

[0014] Preferably, the voltage increment applied to the left binding post and the right binding post is 1-2V.

[0015] The embodiment of the utility model provides a clamping fixture for restoring the polarity of a laser semiconductor diode. Compared with the prior art, the advantageous effects thereof are as follows:

[0016] The utility model provides a base groove on one side of the top surface of the fixture, one end of the base groove fixes the left terminal, and the laser semiconductor device is placed in the base groove, and a slide rail is provided on the other side of the top surface of the fixture, a slider is provided on the slide rail, and a right terminal is provided on the slider; when in use, one side of the laser semiconductor chip of the laser semiconductor device is made to be in close contact with the left terminal, the slider is slid so that one end of the right terminal is in close contact with the laser semiconductor device, and a reverse voltage is applied between the left terminal and the right terminal, and the applied voltage is controlled by the slidable right terminal. The contact time of multiple times with the laser semiconductor device restores the forward polarity of the laser semiconductor device, thereby offsetting the problem of a reduced forward voltage value or a forward conduction short circuit of the semiconductor device caused by the material itself and the process temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of a clamping fixture for restoring the polarity of a laser semiconductor diode provided by an embodiment of the utility model;

[0018] Figure 2 A schematic diagram of a laser semiconductor device of a clamping fixture for restoring the polarity of a laser semiconductor diode provided by an embodiment of the utility model;

[0019] Figure 3 A schematic diagram of a process of recovering a laser semiconductor by a reverse voltage of a clamping fixture for recovering the polarity of a laser semiconductor diode provided in an embodiment of the utility model.

[0020] Among them: 1. left terminal, 2. laser semiconductor device, 3. base groove, 4. slide rail, 5. slider, 6. right terminal, 7. laser semiconductor chip, 8. tungsten copper electrode, 9. aluminum nitride ceramic sheet. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0027] See also Figure 1-2 The embodiment of the utility model provides a clamping fixture for restoring the polarity of a laser semiconductor diode, including a left terminal 1, a laser semiconductor device 2, a base groove 3, a slide rail 4, a slider 5, a right terminal 6, a laser semiconductor chip 7, a tungsten copper electrode 8 and an aluminum nitride ceramic sheet 9.

[0028] In order to solve the problem of low forward voltage or forward conduction of semiconductor devices caused by the process of manufacturing, the utility model utilizes the reverse recovery principle of semiconductor diodes to restore the forward polarity of semiconductor devices by applying reverse voltage at both ends of the semiconductor devices.

[0029] The forward voltage of the currently used gallium arsenide semiconductor device (single) is about 0.8~1.2V, and the forward voltage value of an abnormal semiconductor device is 0~0.6V. When the forward voltage value is infinitely close to zero, the semiconductor device will fail and cannot work normally, and the device cannot output laser normally (not light up). The process manufacturing process is: apply forward voltage and forward current at both ends of the semiconductor device (multiple), the forward current is 0.5~2A, and the forward voltage value is 2V×the number of semiconductor devices, and test the semiconductor laser output performance.

[0030] It has been verified through experiments that when the reverse voltage applied across a single semiconductor device is 20-24V (current 0.5A), the semiconductor device will burn out. That is, the reverse breakdown voltage of a single semiconductor device is 20-24V. Therefore, the reverse voltage applied across the semiconductor device should be less than 20V.

[0031] like Figure 3 As shown, specifically:

[0032] Only by using a multimeter to test laser semiconductor devices with abnormal forward voltage (0-0.6V) can the forward polarity be restored using reverse voltage; for devices with normal forward voltage tests, applying reverse voltage will change the carrier concentration inside the laser semiconductor device, causing the device to fail.

[0033] The forward voltage test data of each abnormal laser semiconductor device is different, and the carrier changes inside the device are also different; the applied reverse voltage parameter range is 4~18V, the current parameter range is 0.5~2A, and the power-on time is 1~2s; the CNC power supply is not equipped with water cooling function. When the current parameter is too large, it will cause the device temperature to rise, and in severe cases, the device will burn out. The reverse current parameter should not be too large, and the fixed parameter is 0.5~2A; the power-on time should be controlled within 1~2s. Too long power-on time may also cause internal damage to the device and cause failure.

[0034] When a reverse voltage is applied to a single laser semiconductor device, the reverse voltage parameter should be gradually increased by 1 to 2V each time, and the current parameter remains unchanged; after each application of the reverse voltage, the reverse voltage of the device should be measured with a multimeter to promptly confirm changes in the forward voltage value; when the forward voltage value of the device returns to normal levels, the direction of the device can be reversed or the positive and negative terminals can be swapped to perform a low-light test (to confirm that the output of the semiconductor device is normal, the test parameters are 0.5 to 2A, 2V).

[0035] When restoring the polarity of the laser semiconductor diode, the reverse voltage should be gradually increased and the forward voltage value should be confirmed repeatedly. When the applied reverse voltage value reaches 18V, the forward voltage of the tested laser semiconductor device still has not returned to the normal level. The abnormality of the device polarity may not be caused by changes in carrier concentration, but may be caused by a short circuit in the indium silver solder connection during the packaging process or internal damage to the laser semiconductor chip.

[0036] The specific workflow is:

[0037] Use a multimeter to test the forward voltage value of the laser semiconductor device. During the test, the black test lead (negative pole) of the multimeter is connected to one side of the laser semiconductor chip 7, and the red test lead (positive pole) is connected to one side of the tungsten copper electrode 8.

[0038] The control standard for the forward voltage process manufacturing process of a single laser semiconductor device is greater than 0.6V. When the test value is between 0 and 0.6V, the reverse voltage can be used to restore the polarity of the laser semiconductor.

[0039] The laser semiconductor device 2 is placed in the base groove 3, with one side of the laser semiconductor chip 7 pressed against the right side of the left terminal 1, and the aluminum nitride ceramic sheet 9 at the bottom of the device pressed against the bottom surface of the groove.

[0040] The left side of the left terminal 1 is connected to the red wire (positive pole) of the CNC power supply, and the right side of the right terminal 6 is connected to the black wire (negative pole) of the CNC power supply.

[0041] Adjust and set the CNC power supply parameters, set the current parameter to 0.5~2A, and the reverse voltage parameter to 4~18V. Gradually increase the applied reverse value. The reverse voltage can be increased by 1~2V at a time. Set the CNC power supply parameters according to the above process.

[0042] Move the slider 5 to the left side of the right terminal 6 through the slide rail 4 until it is close to the laser semiconductor device. After keeping it close, turn on the CNC power switch and connect the reverse voltage for 1 to 2 seconds.

[0043] Use a multimeter to measure the forward voltage value again. If the polarity of the laser semiconductor device recovers to 0.6-1.2V, the operation is completed and the device can be put back into production. If the polarity of the device does not return to normal, repeat the above process. When the reverse voltage value reaches 18V, the device still does not restore the polarity, then the abnormal polarity may not be caused by the change in carrier concentration. The device is classified as scrap and put into inventory.

[0044] The utility model applies a small current and a reverse voltage to a single laser semiconductor device through a designed reverse voltage applying device, so that the internal space charge of the device is reestablished and the forward conduction voltage of the laser semiconductor device is restored. The forward conduction voltage can be restored more quickly and effectively, which is convenient for actual operation of personnel in production.

[0045] The utility model utilizes the reverse recovery characteristic of laser semiconductor to restore the forward voltage drop of laser semiconductor device. During the conduction period of laser diode, a large number of unbalanced carriers are stored inside. Due to the existence of these carriers, when reverse voltage is applied to the conducting diode, the diode cannot immediately restore to the blocking state, but first flows a reverse current, and the external electric field extracts the stored unbalanced carriers, holes move to the anode side, and electrons move to the cathode side. At the same time, these unbalanced carriers are also continuously recombined, and the charge causes the reverse current of the charge extraction diode. During the reverse current action, these minority carriers are completely dissipated in the form of recombination, migration, diffusion, etc., until the carriers therein completely disappear, and the device is restored to the blocking state. The process of minority carrier dissipation is called the reverse recovery process of the diode, and the reverse recovery process is essentially the process of re-establishing the space charge region inside the device.

[0046] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A clamping fixture for restoring the polarity of a laser semiconductor diode, characterized in that: include: A fixture, wherein a base groove (3) is provided on one side of the top surface of the fixture, a left terminal (1) is fixed to one end of the base groove (3), a laser semiconductor device (2) can be placed in the base groove (3), and one side of the laser semiconductor chip (7) of the laser semiconductor device (2) is connected to the left terminal (1); A slide rail (4) is arranged on the other side of the top surface of the fixture, a slider (5) is slidably arranged on the slide rail (4), a right terminal (6) is horizontally arranged on the slider (5), and the slider (5) can slide on the slide rail (4) so ​​that one end of the right terminal (6) can be connected to the laser semiconductor device (2).

2. A fixture for restoring the polarity of a laser semiconductor diode according to claim 1, characterized in that: The aluminum nitride ceramic sheet (9) of the laser semiconductor device (2) is in close contact with the inner bottom surface of the base groove (3).

3. The fixture for restoring the polarity of a laser semiconductor diode according to claim 2, characterized in that: The side of the laser semiconductor chip (7) of the laser semiconductor device (2) is connected to the side of the tungsten copper electrode (8) of the laser semiconductor device (2); The aluminum nitride ceramic sheet (9) is connected to the bottom side of the tungsten copper electrode (8) of the laser semiconductor device (2).

4. The fixture for restoring the polarity of a laser semiconductor diode according to claim 1, characterized in that: The other end of the left binding post (1) is connected to the positive pole of the numerical control power supply, and the other side of the right binding post (6) is connected to the negative pole of the numerical control power supply.

5. The fixture for restoring the polarity of a laser semiconductor diode according to claim 1, characterized in that: When the slider (5) slides on the slide rail (4), the right connecting post (6) can slide in the base groove (3) and one end of the right connecting post (6) can be connected to the laser semiconductor device (2).

6. The fixture for restoring the polarity of a laser semiconductor diode according to claim 1, characterized in that: The position of the base groove (3) on the top surface of the jig is higher than the position of the slide rail (4) on the top surface of the jig.

7. The fixture for restoring the polarity of a laser semiconductor diode according to claim 1, characterized in that: The left connecting post (1) and the right connecting post (6) are powered on for 1 to 2 seconds each time.

8. The fixture for restoring the polarity of a laser semiconductor diode according to claim 1, characterized in that: The voltage increment applied to the left binding post (1) and the right binding post (6) is 1 to 2V.

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