Patent Publication Number: US-2022239186-A1

Title: Voice coil motor base, voice coil motor, and camera module

Description:
TECHNICAL FIELD 
     The present invention relates to the field of electronic equipment, in particular to a voice coil motor base, a voice coil motor using the voice coil motor base, and a camera module. 
     DESCRIPTION OF RELATED ART 
     The camera module is an important part of electronic equipment with camera function, such as a mobile phone or a tablet computer. The camera module generally includes a printed circuit board, an image sensor, a holder, a voice coil motor, and a lens. However, during the production of the base of the traditional voice coil motor, terminal connection leading-out pins are disposed on two sides of the motor, and after tapes are cut, the led-out pin are exposed to the outside and are connected to the circuit, thus there is a very high risk of short-circuiting between the pin and a housing. 
     SUMMARY 
     In light of the shortcomings in the prior art, the objective of the present invention is to provide a voice coil motor base to solve the above problems. 
     The technical problems solved by the present invention can be realized by adopting the following technical solutions. 
     A voice coil motor base includes a base body and two electrode terminals disposed on one side edge of the base body, and further includes a molding tape embedded in the base body. The molding tape is connected to the electrode terminals, the molding tape is provided with pins, and the pins connected to a circuit are disposed inside a voice coil motor. 
     Further, the pins are formed at joints of the molding tape and a scrap tape during processing. 
     Further, the electrode terminals are disposed perpendicular to the molding tape, one end of each of the electrode terminals are disposed in the base body, and the other end of each of the electrode terminals extends in a height direction of the base body and protrudes downward from the base body. 
     Further, the molding tape includes main tapes and auxiliary tapes connected to the scrap tape, and the pins led out after joints between the main tapes and the scrap tape are cut are disposed inside the voice coil motor and connected to the circuit. 
     Further, there are two main tapes respectively and symmetrically disposed on left and right sides in the base body, there are two auxiliary tapes respectively and symmetrically disposed on front and rear sides in the base body, and the two electrode terminals are respectively connected to the two main tapes. The scrap tape includes an outer ring scrap tape and an inner ring scrap tape, each of the main tapes and an adjacent one of the auxiliary tapes are connected by the inner ring scrap tape, a middle part of the base body is provided with a through hole, the inner ring scrap tape is disposed in the through hole, and the pins led out after joints between the main tapes and the inner ring scrap tape are cut are connected to the circuit. The outer ring scrap tape is disposed on an outer side of the base body, and outer sides of the auxiliary tapes are connected to the outer ring scrap tape. 
     Further, each of the main tapes includes a main tape body, and a first tape and a second tape that are connected to an inner side surface of the main tape body, an end of the first tape and an end of the second tape form the pins connected to the circuit, and the electrode terminal is integrally formed with an end of the main tape body. The auxiliary tape includes an auxiliary tape body, and a third tape and a fourth tape that are connected to the inner side surface of the auxiliary tape body. The first tape is connected to the third tape on a corresponding side, and the second tape is connected to the fourth tape on a corresponding side. 
     A voice coil motor includes the voice coil motor base described above. 
     A camera module includes the voice coil motor described above. 
     Compared with the prior art, the beneficial effects of the present invention are as follows. 
     The tapes are cut from the inside to the outside, the pins connected to the circuit are inside the voice coil motor, that is, the pins on the first tapes and the second tapes are inside the voice coil motor, and although the cut pins on the auxiliary tapes are outside the voice coil motor and are in contact with a housing, the auxiliary tapes are not charged; or the tapes and the electrode terminals are designed as separate structures, so the whole device is compact in structure and easy to process and assemble, and well avoids the risk of short-circuiting between the PINs led out after the tapes are cut off and the housing. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic structural diagram of a voice coil motor base according to a first embodiment of the present invention. 
         FIG. 2  is a schematic structural diagram of a molding tape and a scrap tape according to the present invention. 
         FIG. 3  is a cross-sectional view of a base body and a molding tape according to the present invention. 
         FIG. 4  is a schematic structural diagram of a voice coil motor base according to a second embodiment of the present invention. 
         FIG. 5  is a schematic structural diagram of a voice coil motor according to the present invention. 
         FIG. 6  is a schematic structural diagram of a camera module according to the present invention. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention will be further explained below in conjunction with specific embodiments. 
     Referring to  FIG. 1  to  FIG. 6 , a voice coil motor base according to the present invention includes a base body  10  and two electrode terminals  20  disposed on one side edge of the base body  10 . The voice coil motor base further includes a molding tape embedded in the base body  10 , and the molding tape is connected to the flat electrode terminals  20 . The molding tape is provided with pins, and the pins connected with a circuit are disposed inside a voice coil motor. 
     The pins are formed at joints of the molding tape and a scrap tape during processing. 
     The electrode terminals  20  are disposed perpendicular to the molding tape, one end of each of the electrode terminals  20  is disposed in the base body  10 , and the other end of each of the electrode terminals  20  extends in a height direction of the base body  10  and protrudes downward from the base body  10 . 
     The molding tape includes main tapes  31  and auxiliary tapes  32  connected to the scrap tape, and the pins led out after the joints between the main tapes  31  and the scrap tape are cut are disposed inside the voice coil motor and connected to the circuit. 
     There are two main tapes  31  respectively and symmetrically disposed on left and right sides in the base body  10 , and there are two auxiliary tapes  32  respectively and symmetrically disposed on front and rear sides in the base body  10 . The two electrode terminals  20  are respectively connected to the two main tapes  31 . The scrap tape includes an outer ring scrap tape  41  and an inner ring scrap tape  42 . The main tapes  31  and the adjacent auxiliary tapes  32  are connected by the inner ring scrap tape  42 . The middle part of the base body  10  is provided with a through hole, and the inner ring scrap tape  42  is disposed in the through hole. The pins led out after the joints between the main tapes  31  and the inner ring scrap tape  42  are cut are connected to the circuit. The outer ring scrap tape  41  is disposed on the outer side of the base body  10 , and the outer sides of the auxiliary tapes  32  are connected to the outer ring scrap tape  41 . 
     The main tape  31  includes a main tape body  311 , and a first tape  312  and a second tape  313  that are connected to the inner side surface of the main tape body  311 . An end of the first tape  312  and an end of the second tape  313  form the pins connected to the circuit. The electrode terminal  20  is integrally formed with an end of the main tape body  311 , and the electrode terminal  20  is formed by bending the end of the main tape  31  downward and is perpendicular to the main tape  31 . The other end of the main tape body  311  is provided with a flat soldering pad  314 , and the soldering pad  314  is bonded to the end surface of the base body  10 . 
     The auxiliary tape  32  includes an auxiliary tape body  321 , and a third tape  322  and a fourth tape  323  that are connected to the inner side surface of the auxiliary tape body  321 . The first tape  312  is connected to the third tape  322  on the corresponding side, and the second tape  313  is connected to the fourth tape  323  on the corresponding side. 
     In order to adapt to the reasonable arrangement of internal components of the voice coil motor, the shapes of the main tape body  311 , the first tape  312 , the second tape  313 , the auxiliary tape body  321 , the third tape  322  and the fourth tape  323  may be adjusted according to the specific circuit layout, that is, each tape may be of a flat strip structure or arc-shaped or a number of tapes are spliced into a strip structure. The inner ring scrap tape  42  may be of a U-shaped structure or a strip structure, as long as the structure can connect the main tape  31  and the auxiliary tape  32 . 
     During processing, the molding tape and the scrap tape are integrated. The tapes are made of metal. The tapes are installed in a mold for injection molding. The plastic base body  10  formed by plastic and the tapes form an integrated structure, which facilitates processing. After the injection molding is completed, the scrap tape and the molding tape are cut off, and the auxiliary tape bodies  321  are cut from the outer ring scrap tape  41 . Two ends of the inner ring scrap tape  42  are separated from the corresponding first tapes  312 , second tapes  313 , third tapes  322  or fourth tapes  323  by cutting, so that the tapes are cut from the inside to the outside, and the pins connected to the circuit are inside the voice coil motor. At this time, the pins on the first tapes  312  and the second tapes  313  are inside the voice coil motor. Although the cut pins on the auxiliary tapes  32  are outside the voice coil motor and are in contact with a housing  60 , the auxiliary tapes  32  are not charged, so the risk of short-circuiting with the housing  60  is well avoided. 
     Second Embodiment: 
     In order to avoid short-circuiting between the pins connected to the circuit and the housing  60 , the tapes and the electrode terminals may also be designed as separate structures. The outer wall of a second molding tape  51  is connected with a rectangular frame-type second scrap tape (not shown in the figures), the annular second molding tape is formed in a second base body  52  by injection molding, and one end of a second electrode terminal  53  is fixedly inserted into the second base body  52 . 
     Embodiment of Camera Module: 
     The present invention further provides a voice coil motor having the voice coil motor base as described in the first or second embodiment above. In addition, the present invention further provides a camera module having the voice coil motor as described above. The base body  10  is a frame-type member, and the base body  10  is buckled on an open end of the housing  60 , so that an accommodating cavity is formed between the base body  10  and the housing  60 . A lens is installed in the voice coil motor, the voice coil motor is fixed on a holder  70 , the holder  70  is installed on a circuit board  80 , the circuit board  80  in the holder  70  is provided with an image sensor  81 , and the image sensor  81  is electrically connected to the circuit board  80 . The electrode terminals  20  include a positive terminal and a negative terminal. The two electrode terminals  20  are electrically connected to the circuit board to provide high and low levels for driving the voice coil motor to operate. The base body  10 , the holder  70  and the circuit board  80  are connected by a module conductive adhesive tape  90 . 
     The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments, the above embodiments and the description only illustrate the principles of the present invention, the present invention will have various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements all fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and equivalents thereof.