TWI420231B - Testing apparatus for voice coil motor - Google Patents

Description

Voice coil motor test device

The present invention relates to the field of voice coil motors, and more particularly to a test apparatus for life testing of a voice coil motor.

The voice coil motor has the advantages of small size, low power consumption and low price, and is suitable as an actuator in electronic products (such as digital cameras, mobile phones, digital video cameras, etc.) (see Design of a voice coil motor used in the focusing). System of a digital video camera, Magnetics, IEEE Transactions on Volume 41, Issue 10, Oct. 2005 Page(s): 3979-3981).

A common voice coil motor mainly includes a fixing frame and a loading tube and at least one elastic piece movably mounted in the fixing frame. The cartridge is used to mount a lens barrel or a focusing lens group or a zoom lens group, and the elastic piece is used to protect the voice coil motor. When energized, the voice coil motor drives the cartridge to change the distance between the lens barrel or the focus lens group or the zoom lens group and the image sensor, thereby achieving focus or zoom.

When the number of reciprocating movements of the loading cylinder relative to the fixing frame reaches a certain limit value, the voice coil is aging due to the glue in the voice coil motor, or the friction damage of the components in the voice coil motor caused by the vibration is loose, and the like. The motor will fail and stop moving to reach its ultimate life. However, if the assembly is not standardized or the design is wrong, the number of reciprocating movements of the cartridge relative to the holder cannot reach a preset number, which is far below the preset limit life, which is a non-conforming product. Therefore, a life test of the voice coil motor is required to determine whether the batch assembled voice coil motor can reach a preset exercise life. If you can't, you can find the cause and make improvements. However, the existing voice coil motor generally uses an electrode that connects a power source to the voice coil motor to test the voice coil motor one by one. Since the life test of the voice coil motor lasts for a long time, when the number of samples is large, the means of testing one by one seriously affects the test progress and extends the development and production cycle. In addition, the power supply wire is connected to the voice coil motor one by one, and the wire needs to be repeatedly disconnected, which is cumbersome to operate and wastes time and manpower.

Therefore, it is necessary to provide a test apparatus that can simultaneously test the life of a complex voice coil motor with a simple circuit connection.

A voice coil motor testing device will now be described in the context of a specific embodiment.

A voice coil motor testing device includes a base, at least one fixing portion, at least one needle seat and at least one elastic member, the base includes a mounting portion, and the mounting portion is provided with a plurality of motors for receiving the voice coil to be tested The at least one fixing portion is fixed on at least one side of the base, and the needle holder is provided with a probe, and the two ends of the elastic member are respectively connected with the fixing portion and the needle seat, so that the needle seat is elastically pressed against The mounting portion and thus the probe can be in contact with an electrode on the voice coil motor to be tested.

Compared with the prior art, the voice coil motor testing device of the present technical solution has the following advantages: First, the plurality of receiving holes can accommodate a plurality of voice coil motors to be tested, so that the voice coil motor testing device can simultaneously apply to a plurality of voice coils. The life test is carried out, which greatly shortens the test time. Secondly, the two ends of the elastic element are respectively connected to the fixing portion and the needle seat, so that the needle seat is elastically pressed against the mounting portion, so that the probe can be in contact with the electrode on the voice coil motor to be tested, thereby The needle supplies power to the voice coil motor to drive the voice coil motor for life test, which can conveniently insert and remove the voice coil motor, reduce the trouble of repeatedly disconnecting the wires, and the circuit connection is simple and convenient.

The voice coil motor testing device of the present technical solution will be further described in detail below with reference to the accompanying drawings and the embodiments.

The structure of the voice coil motor 100 to be subjected to the life test in the present embodiment will be briefly described below. Referring to FIG. 1 , the voice coil motor 100 includes a fixing frame 101 , a loading cylinder 102 , a spring piece 103 , and two electrodes 104 . The cartridge 102 is movably mounted in the holder 101. The elastic piece 103 can be fixed to both ends of the loading cylinder 102 by dispensing. The two electrodes 104 are for connection with an external circuit (not shown) to drive the barrel 102 to reciprocate.

Referring to FIG. 2 to FIG. 4 , the voice coil motor testing device 200 provided by the first embodiment of the present invention includes a base 10 , at least one fixing portion 20 , at least one needle holder 30 , and at least one elastic member 40 .

The base 10 has a mounting portion 11. The mounting portion 11 is plate-shaped having an opposite upper surface 111 and a lower surface 112, and opposite side surfaces 113 connecting the upper surface 111 and the lower surface 112. A plurality of receiving pockets 114 are opened from the upper surface 111 to the mounting portion 11. The size and shape of the receiving hole 114 are matched with the size and shape of the voice coil motor 100 to accommodate the fixed plurality of voice coil motors to be tested. 100. In this embodiment, the receiving holes 114 are in two rows, which are arranged in a matrix. Of course, the receiving hole 114 can also be disposed in the mounting portion 11 in other arrangements.

A plurality of guide grooves 115 are respectively opened from the both side faces 113 into the mounting portion 11. Each of the guiding grooves 115 corresponds to the receiving hole 114 adjacent to the side surface 113, respectively. However, the guiding groove 115 is not in direct communication with the receiving hole 114, and has a blocking wall 116 therebetween. A through hole 117 is defined between the guiding groove 115 and the receiving hole 114. The through hole 117 penetrates the retaining wall 116 and corresponds to the position of the two electrodes 104 of the voice coil motor 100 to be tested accommodated in the receiving cavity 114. Of course, the through hole 117 can be a slot or a circular hole opposite to the electrode 104.

The fixing portion 20 is disposed at a side end of the base 10 and opposite to the mounting portion 11 , that is, on opposite sides of the side surfaces 113 of the mounting portion 11 . The fixing portion 20 can be fixed to the base 10 by a screw connection. Of course, the fixing portion 20 may be formed integrally with the mounting portion 11. A groove 202 is defined between the mounting portion 11 and the fixing portion 20.

The hub 30 is received in the recess 202 between the mounting portion 11 and the fixing portion 20. The hub 30 has a first side 301 and a second side 302 opposite thereto. The first side surface 301 is opposite to the mounting portion 11 and the second side surface 302 is opposite to the fixing portion 20. Both ends of the hub 30 have guide holes 303 extending through the first side surface 301 and the second side surface 302. The needle holder 30 extends from the first side surface 301 toward the mounting portion 11 to form a plurality of guide blocks 32. The guide block 32 corresponds to the guide groove 115 of the mounting portion 11, respectively. The guiding block 32 is sized to match the size of the guiding groove 115, so that when the needle holder 30 is moved toward the mounting portion 11, the guiding block 32 can be received in the guiding groove 115 of the mounting portion 11.

The needle holder 30 has a probe protruding from the guide block 32 toward the mounting portion 11 34. Therein, each guide block 32 has two probes 34. The two probes 34 are disposed at positions opposite to the positions of the two electrodes 104 of the voice coil motor 100 to be tested, and the positions of the two probes 34 are opposite to the positions of the through holes 117 of the retaining wall 116 of the mounting portion 11. Thus, the two probes 34 can pass through the through holes 117 to contact the two electrodes 104 of the voice coil motor 100 to be tested accommodated in the receiving holes 114 to power the voice coil motor 100 to drive its movement.

The two ends of the elastic member 40 are respectively connected to the fixing portion 20 and the needle holder 30, so that the needle holder 30 is elastically pressed against the mounting portion 11, so that the probe 34 can be in contact with the electrode 104 on the voice coil motor 100 to be measured. . In this embodiment, the elastic member 40 is a spring.

The voice coil motor testing device 200 further includes a guide rod 50 extending from the fixing portion 20 toward the mounting portion 11, the spring being sleeved on the guide rod 50. The guide rod 50 is fixedly coupled between the mounting portion 11 and the fixing portion 20 and penetrates the needle holder 30. In this embodiment, one side of the voice coil motor testing device 200 has two guiding rods 50, and the two guiding rods 50 respectively pass through the guiding holes 303 at both ends of the needle holder 30, so that the needle holder 30 can be installed along the guiding rod 50. The portion 11 moves between the portion 11 and the fixed portion 20.

The spring is disposed around the guide bar 50. When the spring is released, the needle holder 30 can be pushed against the mounting portion 11 such that the probe 34 of the needle holder 30 is in pressure contact with the electrode 104 of the voice coil motor 100 to be tested. Wherein, the pressing force of the spring can be set according to the contact force required for the probe 34 and the electrode 104 to stably abut. Thus, an external circuit (not shown) can power the voice coil motor 100 via the probe 34 to drive the voice coil motor 100 to perform a life test.

Further, one end of the mounting portion 11 further has a connection port 105. The connection port 105 and each of the probes 34 of the hub 30 can be embedded in The mounting portion 11 is electrically connected to the wires of the hub 30. The connection port 105 can be connected to the external power board by a plug-in connector (not shown), and can supply power to the specific voice coil motor 100 in the receiving cavity 114 by the controller control power.

Preferably, the voice coil motor life testing device 200 further includes an upper cover 60 that is provided with a through hole 602 corresponding to the receiving hole 114 of the mounting portion 11. The through hole 602 can be used to observe whether the voice coil motor 100 in the corresponding receiving hole 114 is normally moving. The diameter of the through hole 602 is smaller than the diameter of the receiving hole 114, so that the upper cover 60 can be fixedly connected to the mounting portion 11 by screws to further fix the fixing frame 101 of the voice coil motor 100, thereby avoiding unnecessary vibration of the fixing frame 101. The normal operation of the life test of the voice coil motor 100 is affected.

Referring to FIG. 5, the voice coil motor testing device 300 provided by the second embodiment of the present technical solution is substantially the same as the voice coil motor testing device 200 of the first embodiment, except that the voice coil motor testing device 300 further Further included is a complex sensor 310 and a processor 320. The plurality of sensors 310 are respectively embedded in the bottom or side walls of the receiving holes 330. In this embodiment, the sensor 310 is embedded in the bottom of the receiving hole 330. The sensor 310 is in contact with the holder 101 of the voice coil motor 100 housed in the receiving pocket 330 to sense whether the voice coil motor 100 is normally moving. The sensor 310 can be a vibration sensor. The processor 320 is electrically connected to the plurality of sensors 310. When the sensor 310 senses that the voice coil motor 100 in the corresponding receiving pocket 330 stops moving, the sensor 310 sends a signal to the processor 320, and the processor 320 can Determining the position of the voice coil motor 100 that stops the motion and its total speed Line time.

Since the number of reciprocations of the charging cylinder 102 of the voice coil motor 100 per unit time is constant, the total number of operations can be determined according to the total running time thereof to determine whether the voice coil motor 100 has reached the standard life.

In addition, the voice coil motor test device can be provided with a multi-layer structure to accommodate more voice coil motors for testing. Moreover, the probe can also be replaced and adjusted according to the position of the electrode of the voice coil motor. After testing a batch, simply press the spring to push the needle holder to remove the voice coil motor and put another batch of voice coil motor for testing.

Compared with the prior art, the voice coil motor testing device of the present technical solution has the following advantages: First, the plurality of receiving holes can accommodate a plurality of voice coil motors to be tested, so that the voice coil motor testing device can simultaneously perform the plurality of voice coil motors. Life testing greatly reduces test time. Secondly, the two ends of the elastic element are respectively connected to the fixing portion and the needle seat, so that the needle seat is elastically pressed against the mounting portion, so that the probe can be in contact with the electrode on the voice coil motor to be tested, thereby The needle supplies power to the voice coil motor to drive the voice coil motor for life test, which can conveniently insert and remove the voice coil motor, reduce the trouble of repeatedly disconnecting the wires, and the circuit connection is simple and convenient.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

Voice coil motor ‧‧100

Fixing frame ‧ ‧ 101

Loading ‧‧‧102

Shrapnel ‧‧‧103

Electrode ‧‧104

Voice coil motor test device ‧‧200,300

Pedestal ‧‧10

Fixed Department ‧‧20

Needle ‧ ‧ 30

Elastic element ‧‧40

Installation Department ‧‧11

Upper surface ‧‧‧111

Lower surface ‧‧‧112

Side ‧‧‧113

Containment holes ‧‧‧114, 330

Guide slot ‧‧‧115

Barrier ‧‧116

Through hole ‧‧117,602

Groove ‧‧‧202

First side ‧ ‧ 301

Second side ‧‧‧302

Guide hole ‧‧ 303

Guide block ‧‧32

Probe ‧‧ ‧

Guide ‧‧50

Connection port ‧‧‧105

Upper cover ‧‧‧60

Sensor ‧‧310

Processor ‧‧320

FIG. 1 is a schematic diagram of a voice coil motor to be tested according to the technical solution.

2 is a schematic diagram of a voice coil motor testing device provided by a first embodiment of the present technical solution.

Figure 3 is a schematic diagram of the voice coil motor test using the voice coil motor test apparatus of Figure 2.

Figure 4 is a partial cross-sectional view showing the use of the voice coil motor of Figure 3.

FIG. 5 is a schematic diagram of a voice coil motor testing device provided by a second embodiment of the present technical solution.

Voice coil motor tester ‧‧‧ 200

Barrier ‧‧116

Pedestal ‧‧10

Through hole ‧‧117,602

Fixed Department ‧‧20

Groove ‧‧‧202

Needle ‧ ‧ 30

First side ‧ ‧ 301

Elastic element ‧‧40

Second side ‧‧‧302

Installation Department ‧‧11

Guide hole ‧‧ 303

Upper surface ‧‧‧111

Guide block ‧‧32

Lower surface ‧‧‧112

Probe ‧‧ ‧

Side ‧‧‧113

Guide ‧‧50

Containment hole ‧‧114

Connection port ‧‧‧105

Guide slot ‧‧‧115

Upper cover ‧‧‧60

Claims (10)

A voice coil motor testing device includes a base, at least one fixing portion, at least one needle seat and at least one elastic member, the base includes a mounting portion, and the mounting portion is provided with a plurality of motors for receiving the voice coil to be tested The at least one fixing portion is fixed on at least one side of the base, and the needle holder is provided with a probe, and the two ends of the elastic member are respectively connected with the fixing portion and the needle seat, so that the needle seat is elastically pressed against The mounting portion and thus the probe can be in contact with an electrode on the voice coil motor to be tested. The voice coil motor testing device of claim 1, wherein the mounting portion and the needle holder are provided with a guiding groove corresponding to the receiving hole on a side opposite to the needle seat, and the guiding groove and the receiving hole are provided for the probe to pass through. The through hole is provided with a guiding block matched with the guiding groove, and the probe is disposed on the guiding block and protrudes toward the mounting portion. The voice coil motor testing device of claim 1, further comprising an upper cover, the upper cover and the mounting portion being fixed by a screw connection to press the voice coil motor in the receiving hole, and the upper cover A through hole is formed at a position corresponding to the receiving hole, and the diameter of the through hole is smaller than the diameter of the receiving hole. The voice coil motor testing device of claim 1, wherein one end of the mounting portion has a connection port electrically connected to each probe of the needle holder. The voice coil motor testing device of claim 1, wherein a sensor is embedded in a bottom of each of the receiving holes, and the sensor is configured to sense a movement condition of the voice coil motor, and the mounting portion is A processor is embedded at one end, and the processor is electrically connected to the plurality of sensors, and the processor returns according to the sensor The signal determines the position of the voice coil motor that has stopped moving and records its total running time. The voice coil motor testing device of claim 1, wherein the needle holder has two probes corresponding to each receiving hole, and the voice coil motor has two electrodes, and the two probes are respectively in contact with the two electrodes to drive the sound. Circle motor. The voice coil motor testing device of claim 1, wherein a recess is defined between the mounting portion and the fixing portion, and the hub is received in the recess. The voice coil motor testing device according to claim 1, wherein the mounting portion is integrally formed with the fixing portion. The voice coil motor testing device of claim 1, wherein the elastic member is a spring. The voice coil motor testing device of claim 9, further comprising a guide rod extending from the fixing portion to the mounting portion, the spring being sleeved on the guiding rod.