A surface mount light emitting diode light intensity test fixture

Abstract

The application relates to a clamp for testing the light intensity of a surface-mounted light-emitting diode, and belongs to the field of surface-mounted light-emitting diode detection auxiliary equipment. The clamp comprises an LED carrier plate and an electrode carrier plate which are connected with each other. The LED carrier plate is provided with a positioning groove for mounting a surface-mounted light-emitting diode. The end face of the electrode carrier plate facing the LED carrier plate is connected with two probes, and the end face of the electrode carrier plate away from the LED carrier plate is connected with two clamp pins. The probes and the clamp pins are electrically connected in one-to-one correspondence. The upper end of the probe is arranged in the positioning groove and is used for electrically connecting with two electrodes of the surface-mounted light-emitting diode. The application is convenient for assisting the light intensity detection of a novel small-sized SMD LED. The SMD LED is convenient to disassemble and assemble, the light-emitting component is not shielded, and the electrodes of the SMD LED and the thimbles always have good contact effect.

Description

Technical Field

[0001] This application belongs to the field of auxiliary equipment for testing surface-mount light-emitting diodes, and specifically relates to a fixture for testing the light intensity of surface-mount light-emitting diodes. Background Technology

[0002] With the rapid development of electronic information technology, surface-mount LEDs (SMD LEDs) have become widely used in display panels, lighting equipment, consumer electronics, and many other fields due to their advantages such as small size, low power consumption, high luminous efficiency, and high reliability. Light intensity, as one of the core optical performance indicators of SMD LEDs, directly affects the display effect and lighting quality in its application scenarios. Therefore, precise light intensity testing is required before products leave the factory to ensure that product performance meets design standards.

[0003] Currently, SMD LED light intensity testing typically requires fixing the LED with a fixture and energizing the electrodes, then using optical detection equipment to collect the luminescence parameters. However, with the increasing trend of miniaturization and high-density integration in electronic devices, the size of new SMD LEDs is constantly shrinking. Miniature surface-mount LEDs with dimensions of only 2mm × 3mm × 1.2mm have appeared on the market. The structural characteristics of these LEDs have brought many challenges to traditional light intensity testing technologies.

[0004] Conventional power-on methods are unsuitable for the micro-LED structure. Traditional SMD LED light intensity testing often involves clamping the LED electrodes to achieve power. However, the electrodes of new micro-SMD LEDs are only 0.5mm thick, making them extremely thin. On one hand, precise positioning during side clamping is difficult, easily leading to electrode damage or LED breakage due to excessive clamping force. On the other hand, the contact area between the ultra-thin electrode side and the clamping mechanism is too small to form a stable electrical connection, easily resulting in poor contact, arcing, and other problems, leading to test interruptions or data distortion, thus failing to meet the testing requirements of micro-SMD LEDs.

[0005] The cumbersome LED handling process results in low testing efficiency. Due to the extremely small size of new SMD LEDs, existing test fixtures lack a specific design for handling. Operators must use tools such as tweezers for manual assembly and disassembly, which is not only difficult and time-consuming but also prone to causing LEDs to fall or be damaged due to improper handling, leading to test interruptions. Furthermore, the cumbersome handling steps cannot meet the high-efficiency testing requirements of mass production, severely hindering the improvement of production efficiency. Therefore, there is an urgent need to design a dedicated fixture that allows for quick and user-friendly handling.

[0006] During testing, the front of the LED is easily blocked, affecting the accuracy of the test. The light intensity test of SMD LED requires the collection of its front luminous flux and light intensity distribution. If the structural design of the test fixture is unreasonable, its components may easily block the light-emitting area of ​​the LED front.

[0007] In summary, existing light intensity testing technologies have significant shortcomings in terms of power-on method, ease of handling, and testing accuracy, given the structural characteristics of novel micro surface-mount LEDs. Developing a dedicated test fixture that is compatible with micro LEDs, easy to handle, and does not obstruct the light-emitting surface has become an urgent technical problem to be solved in the industry. Utility Model Content

[0008] The technical problem to be solved by this application is to overcome the shortcomings of the prior art and provide a fixture for testing the light intensity of surface mount LEDs. This application facilitates the detection of light intensity of novel miniaturized SMDLEDs. SMDLEDs are easy to install and remove, the light-emitting components are unobstructed, and the electrodes of the SMDLED and the ejector pins always maintain good contact.

[0009] The technical solution adopted by this application to solve its existing problems is: A fixture for testing the light intensity of surface-mount light-emitting diodes includes an LED carrier plate and an electrode carrier plate that are interconnected.

[0010] The LED carrier plate is provided with positioning slots for mounting surface-mount light-emitting diodes.

[0011] Two probes are connected to the end face of the electrode carrier plate facing the LED carrier plate, and two clamping pins are connected to the end face of the electrode carrier plate away from the LED carrier plate.

[0012] The probes are electrically connected to the fixture pins in a one-to-one correspondence. The upper end of the probe passes through the positioning groove and is used to electrically connect with the two electrodes of the surface-mount LED.

[0013] Furthermore, the bottom of the positioning groove is provided with a probe through hole, and the top of the probe passes through the probe through hole into the positioning groove.

[0014] Furthermore, a pressure plate is detachably connected to the LED carrier, and the pressure plate is provided with LED bead exposure holes, which are located directly above the surface-mount LED light-emitting components installed inside the positioning groove.

[0015] Furthermore, the LED carrier plate is provided with threaded holes, and the pressure plate is provided with through holes. The first fastening bolt passes through the through hole of the pressure plate and is inserted into the threaded hole, and the two are threadedly connected.

[0016] Furthermore, the electrode carrier is provided with two conductive plates, and a probe and a clamp pin are fixedly connected to the upper and lower sides of each conductive plate, respectively.

[0017] Furthermore, the LED carrier plate and the electrode carrier plate are connected by an elastic assembly, and the spring contained in the elastic assembly causes the electrode carrier plate to move toward the LED carrier plate.

[0018] Furthermore, the elastic assembly includes a stepped threaded sleeve, a spring, and a first fixing screw.

[0019] The LED carrier plate has a first through hole, and the electrode carrier plate has a second through hole. The top of the stepped screw sleeve passes through the second through hole and abuts against the bottom surface of the LED carrier plate. The spring is sleeved on the stepped screw sleeve and is located on the side of the electrode carrier plate away from the LED carrier plate.

[0020] The first fixing screw passes through the first through hole and is then inserted into the threaded hole of the stepped screw sleeve, and the two are connected by threads.

[0021] Furthermore, it also includes a base box, with an outer cover detachably connected to the open end of the base box. The bottom surface of the base box has two mounting holes that are fitted into the clamp pins.

[0022] Compared with the prior art, the beneficial effects of this application are as follows: (1) The design of the positioning slot not only meets the conventional vertical clamping requirements, but also simplifies the horizontal picking and placing of surface-mount LEDs by inserting them into the channel. This solves the problems of cumbersome assembly and disassembly and low efficiency of existing fixtures, adapts to the rapid material change requirements in batch testing scenarios, and improves the ease of assembly and disassembly.

[0023] (2) The spring of the elastic assembly provides a continuous upward elastic force, which causes the electrode carrier plate to drive the probe to always be in close contact with the LED electrode. This effectively avoids poor contact caused by assembly gaps, vibration or slight deviations in LED size, ensures the stability of electrical connection during testing, reduces test errors caused by contact problems, and improves the accuracy of light intensity test results.

[0024] (3) The probe and clamp pins are gold-plated, which improves the corrosion resistance and conductivity of the components and extends their service life. At the same time, the probe and clamp pins are connected in a detachable manner through a conductive plate, which enables the individual replacement of a single vulnerable component without replacing the entire clamp, thus greatly reducing maintenance costs.

[0025] (4) A detachable pressure plate is added and fixed to the LED carrier plate by the first fastening bolt. This can effectively counteract the upward pushing force exerted on the LED by the probe due to the spring force, prevent the LED from falling out of the positioning slot or shifting, ensure the LED position is stable during the test, and further guarantee the reliability of the test.

[0026] (5) The matching bottom box can not only position the fixture pins through the assembly holes to realize the orderly storage of the fixture, but also can be inverted during testing to support the fixture as a loading platform, avoiding damage to the fixture pins due to force or collision. It takes into account both storage protection and auxiliary functions, and improves the overall practicality of the fixture. Attached Figure Description

[0027] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a first structural diagram of a fixture for testing the light intensity of a surface-mount LED, according to this application, after mounting the surface-mount LED. Figure 2 This is a second structural diagram of a fixture for testing the light intensity of a surface-mount LED, according to this application, after mounting the surface-mount LED. Figure 3 for Figure 1 Side view, Figure 4 for Figure 1 The exploded diagram, Figure 5 This is a structural diagram of a fixture for testing the light intensity of a surface-mount light-emitting diode (LED). Figure 6 This is a structural diagram of the LED carrier board in a fixture for testing the light intensity of surface-mount LEDs according to this application. Figure 7 This is a structural diagram of the electrode carrier plate in a fixture for testing the light intensity of a surface-mount LED, as described in this application. Figure 8 This is a structural diagram of an elastic assembly of a fixture for testing the light intensity of a surface-mount LED, as described in this application. Figure 9 This is a structural diagram of a fixture for testing the light intensity of a surface-mount LED after it is connected to a base box, according to this application. Figure 10 This is a structural diagram of a fixture for testing the light intensity of a surface-mount LED, as described in this application, placed inside a base box. Figure 11 This is a schematic diagram of the bottom of the box.

[0029] In the diagram: 1-LED carrier, 101-positioning groove, 102-probe through hole, 103-first through hole, 104-threaded hole, 2-electrode carrier, 201-conductive plate, 202-second through hole, 3-probe, 4-clamp pin, 5-stepped screw sleeve, 6-spring, 7-first fixing screw, 8-pressure plate, 801-LED bead exposure hole, 9-second fixing screw, 10-base box, 1001-assembly hole, 11-outer cover, 12-surface mount LED. Detailed Implementation

[0030] The attached figure shows a preferred embodiment of the fixture for testing the light intensity of a surface-mount LED. The following is a more detailed description of this application in conjunction with the attached figure.

[0031] Depend on Figures 1 to 11 As shown, a fixture for testing the light intensity of surface-mount light-emitting diodes includes an LED carrier plate 1 and an electrode carrier plate 2 that are connected to each other.

[0032] The LED carrier 1 is provided with a positioning groove 101 for mounting surface-mount light-emitting diodes 12. The positioning groove 101 may be open only at the top, and the surface-mount light-emitting diodes 12 may be inserted into the positioning groove 101 from the top opening. Alternatively, the positioning groove 101 may have an insertion channel extending to the end face of the LED carrier 1 on one side in addition to the top opening. The insertion channel facilitates the removal of the surface-mount light-emitting diodes 12.

[0033] Two probes 3 are connected to the end face of the electrode carrier 2 facing the LED carrier 1, and two clamping pins 4 are connected to the end face of the electrode carrier 2 away from the LED carrier 1. The probes 3 are gold-plated probes, and the clamping pins 4 are gold-plated pins, which improves durability and service life.

[0034] The probe 3 and the clamp pin 4 are electrically connected in a one-to-one correspondence. In order to facilitate individual replacement, in this embodiment, the electrode carrier plate 2 is provided with two conductive plates 201. Each conductive plate 201 has a probe 3 and a clamp pin 4 fixedly connected to its upper and lower sides in a detachable manner.

[0035] The bottom of the positioning groove 101 is provided with a probe through hole 102, and the top of the probe 3 passes through the probe through hole 102 into the positioning groove 101 for electrical connection with the two electrodes of the surface-mount light-emitting diode 12.

[0036] The LED carrier plate 1 and the electrode carrier plate 2 are connected by an elastic assembly, and the spring 6 included in the elastic assembly causes the electrode carrier plate 2 to move toward the LED carrier plate 1.

[0037] The elastic assembly includes a stepped threaded sleeve 5, a spring 6, and a first fixing screw 7. The stepped threaded sleeve 5 includes a sleeve with a threaded hole and a nut at the bottom, the outer diameter of which is larger than the outer diameter of the sleeve.

[0038] The LED carrier plate 1 has a first through hole 103, and the electrode carrier plate 2 has a second through hole 202. The top of the stepped screw sleeve 5 passes through the second through hole 202 and abuts against the bottom surface of the LED carrier plate 1. The spring 6 is sleeved on the stepped screw sleeve 5. The spring 6 is located on the side of the electrode carrier plate 2 away from the LED carrier plate 1. The upper and lower end faces of the spring 6 abut against the bottom surface of the electrode carrier plate 2 and the nut end face of the stepped screw sleeve 5, respectively.

[0039] The first fixing screw 7 passes through the first through hole 103 and is inserted into the threaded hole of the stepped screw sleeve 5, and the two are threadedly connected.

[0040] A set screw is provided between the LED carrier plate 1 and the electrode carrier plate 2. The set screw is threadedly connected to the threaded hole on the LED carrier plate 1. The set screw is used to limit the compression gap between the electrode carrier plate 2 and the LED carrier plate 1.

[0041] The surface-mount LED 12 is mounted via the positioning slot 101 on the LED carrier board 1, and the specific operation is as follows: The installation method is selected according to the structure of the positioning groove 101: If the positioning groove 101 has only an open top, the surface-mount LED 12 is vertically inserted into the opening at the top of the positioning groove 101, so that the bottom of the LED 12 is in contact with the bottom of the positioning groove 101. The horizontal displacement of the LED 12 is restricted by the inner wall of the positioning groove 101, thus completing the initial positioning. If, in addition to the open top, the positioning groove 101 also has an insertion channel extending to the end face of the LED carrier board 1 on one side, the surface-mount LED 12 can be horizontally pushed into the positioning groove 101 along the insertion channel until its bottom is in contact with the bottom of the positioning groove 101. The insertion channel simplifies the placement and removal of the LED 12, and horizontal positioning is also achieved through the inner wall of the positioning groove 101.

[0042] After installation, the two electrodes of the surface-mount LED 12 face downwards, corresponding to the probe through-hole 102 at the bottom of the positioning groove 101. Under the action of the spring 6, the probe 3 abuts against the electrodes of the surface-mount LED 12.

[0043] Reliable contact between probe 3 and the electrode of surface-mount LED 12 is achieved by the continuous elastic force provided by spring 6 of the elastic assembly, as follows: By tightening the first fixing screw 7, the LED carrier plate 1 is fixed relative to the stepped screw sleeve 5, at which point the spring 6 is in a compressed state. The compressed spring 6 generates an upward elastic force, which acts on the bottom surface of the electrode carrier plate 2, causing the electrode carrier plate 2 to move towards the LED carrier plate 1. As the electrode carrier plate 2 moves towards the LED carrier plate 1, the two probes 3 connected to the end face of the LED carrier plate 1 move upward synchronously with the electrode carrier plate 2. The top of the probes 3 passes through the probe through-hole 102 at the bottom of the positioning groove 101 and enters the positioning groove 101, finally abutting against the two electrodes of the surface-mount LED 12 pre-installed in the positioning groove 101. Since the spring 6 is always kept in a compressed state and provides continuous elastic force, a stable and reliable electrical connection can be formed between the probes 3 and the electrodes of the surface-mount LED 12, avoiding poor contact due to assembly gaps or vibration.

[0044] As the probe 3 applies pressure to the surface-mount LED 12 under the action of the spring 6, in order to prevent the surface-mount LED 12 from falling out of the positioning groove 101, in this embodiment, a pressure plate 8 is detachably connected to the LED carrier board 1. The pressure plate 8 is provided with an LED exposure hole 801, which is located directly above the light-emitting component of the surface-mount LED 12 installed inside the positioning groove 101.

[0045] The LED carrier plate 1 is provided with a threaded hole 104, and the pressure plate 8 is provided with a through hole. The first fastening bolt 9 passes through the through hole of the pressure plate 8 and is inserted into the threaded hole 104. The two are threadedly connected, and the pressure plate 8 and the LED carrier plate 1 are fixedly connected by the first fastening bolt 9.

[0046] To facilitate the storage of the light intensity testing fixture and to prevent damage to the fixture pins 4 when installing the surface-mount LED 12, this embodiment also includes a base box 10. An outer cover 11 is detachably connected to the open end of the base box 10. Two mounting holes 1001 are recessed on the bottom surface of the base box 10, and the mounting holes 1001 are engaged with the fixture pins 4 for insertion.

[0047] Depend on Figure 10 As shown, when the light intensity testing fixture is not suitable, it is placed inside the bottom box 10, and then the outer cover 11 is closed for easy storage. A label is affixed to the outside of the bottom box 10 for easy categorization and storage.

[0048] When the light intensity testing fixture is used, it is taken out from inside the base box 10, the base box 10 is inverted, the fixture pin 4 is inserted into the assembly hole 1001, the stepped screw sleeve 5 abuts against the bottom surface of the base box 10, the base box 10 supports it, and it is used as a loading platform.

[0049] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A fixture for testing the light intensity of surface-mount light-emitting diodes, characterized in that: It includes an interconnected LED carrier plate (1) and an electrode carrier plate (2); The LED carrier board (1) is provided with a positioning groove (101) for mounting surface-mount light-emitting diodes (12). Two probes (3) are connected to the end face of the electrode carrier (2) facing the LED carrier (1), and two clamp pins (4) are connected to the end face of the electrode carrier (2) away from the LED carrier (1). The probe (3) is electrically connected to the clamp pin (4) in a one-to-one correspondence. The upper end of the probe (3) is inserted into the positioning groove (101) for electrical connection with the two electrodes of the surface-mount light-emitting diode (12).

2. The fixture for testing the light intensity of surface-mount light-emitting diodes according to claim 1, characterized in that: The bottom of the positioning groove (101) is provided with a probe through hole (102), and the top of the probe (3) passes through the probe through hole (102) into the positioning groove (101).

3. The fixture for testing the light intensity of surface-mount light-emitting diodes according to claim 2, characterized in that: A pressure plate (8) is detachably connected to the LED carrier board (1). The pressure plate (8) is provided with an LED bead exposure hole (801). The exposure hole (801) is located directly above the surface mount LED (12) light-emitting component installed inside the positioning groove (101).

4. A fixture for testing the light intensity of surface-mount light-emitting diodes according to claim 3, characterized in that: The LED carrier plate (1) is provided with a threaded hole (104), and the pressure plate (8) is provided with a through hole. The first fastening bolt (9) passes through the through hole of the pressure plate (8) and is inserted into the threaded hole (104), and the two are threadedly connected.

5. A fixture for testing the light intensity of surface-mount light-emitting diodes according to claim 1, 2, 3, or 4, characterized in that: The electrode carrier plate (2) is provided with two conductive plates (201), and a probe (3) and a clamp pin (4) are fixedly connected to the upper and lower sides of each conductive plate (201).

6. A fixture for testing the light intensity of surface-mount light-emitting diodes according to claim 2, 3, or 4, characterized in that: The LED carrier plate (1) and the electrode carrier plate (2) are connected by an elastic assembly, and the spring (6) included in the elastic assembly causes the electrode carrier plate (2) to move toward the LED carrier plate (1).

7. A fixture for testing the light intensity of surface-mount light-emitting diodes according to claim 6, characterized in that: The elastic assembly includes a stepped threaded sleeve (5), a spring (6), and a first fixing screw (7); The LED carrier plate (1) is provided with a first through hole (103), and the electrode carrier plate (2) is provided with a second through hole (202). The top of the stepped screw sleeve (5) passes through the second through hole (202) and abuts against the bottom surface of the LED carrier plate (1). The spring (6) is sleeved on the stepped screw sleeve (5). The spring (6) is located on the side of the electrode carrier plate (2) away from the LED carrier plate (1). The first fixing screw (7) passes through the first through hole (103) and is inserted into the threaded hole of the stepped screw sleeve (5), and the two are threadedly connected.

8. A fixture for testing the light intensity of surface-mount light-emitting diodes according to claim 1, 2, 3, 4, or 7, characterized in that: It also includes a base box (10), with an outer cover (11) detachably connected to the open end of the base box (10). The bottom surface of the base box (10) is recessed with two mounting holes (1001), which are engaged with the clamp pins (4).

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