A pan-tilt automatic zoom voice coil motor

Abstract

The present invention discloses a pan-tilt automatic zoom voice coil motor, comprising: a lens, a light-shielding sticker, an iron shell, a spring, a carrier, a module, a cover plate, a driving magnet, and a base; the driving magnet is bonded to the inner wall of the iron shell; the cover plate is fixed to the base; the module is fixed to the lower end surface of the carrier; the spring and the carrier are riveted together; the spring frame is riveted to the base; the iron shell is bonded to the base; one side of the light-shielding sticker is bonded to the lens, and the other side is bonded to the iron shell; after the carrier is energized, an electromagnetic force is generated along the optical axis under the action of the magnetic field of the driving magnet, and the electromagnetic force is balanced with the reverse elastic force provided by the flexible circuit board and the spring on the module, so that the photosensitive chip on the module is pushed to the required position to realize the focus in the shooting function. The present invention adopts the design structure of the dynamic photosensitive chip, which makes the entire assembly process more convenient, and the entire camera module is very thin, realizing the automatic focus function of the front camera of the mobile phone.

Description

Technical Field

[0001] The present invention relates to the technical field of voice coil motors, and in particular to a voice coil motor for automatic focusing of a mobile phone camera pan / tilt. Background Art

[0002] Since the voice coil motor (VCM) has the advantages of simple structure, small size, low energy consumption, no noise, high acceleration, fast response speed, precise displacement and low price, the automatic focusing function of the voice coil motor is still the most cost-effective solution for the automatic focusing device of the camera. The traditional voice coil motor fixes the optical lens on the voice coil motor carrier, which serves as the power unit for the movement of the lens, and connects the voice coil motor carrier and the stator through a reed. When the motor is powered on, the carrier will move linearly along the optical axis of the lens, thereby realizing the automatic focusing function.

[0003] Traditional voice coil motors use a moving carrier and lens solution to achieve clear imaging by adjusting the position of the lens. Although this solution can achieve the function of autofocus, the use of a moving lens to achieve focus limits the height of the motor and makes it impossible to be very thin. With the limitations on mobile phone thickness and the market demand for front camera selfie zoom functions, how to break the traditional moving lens method while keeping the thickness of the phone unchanged has become an urgent problem that needs to be solved. Summary of the invention

[0004] In order to solve the limitation of the thickness of traditional voice coil motors, the present invention breaks the traditional dynamic lens method and adopts a dynamic imaging module solution. The imaging module is bonded to the carrier winding. After the carrier winding is energized, an electromagnetic force along the optical axis is generated under the action of the driving magnet magnetic field. The photosensitive chip on the module is pushed to the required position through the balance of the electromagnetic force and the reverse elastic force provided by the flexible circuit board and the spring on the module, thereby realizing the focus of the shooting function in a very small space.

[0005] The technical solution adopted to achieve the purpose of the present invention is:

[0006] A pan / tilt automatic zoom voice coil motor comprises: a lens, a light-shielding sticker, an iron shell, a spring, a carrier, a module, a cover plate, a driving magnet and a base; the driving magnet is bonded to the inner wall of the iron shell; the cover plate is fixed to the base; the module is fixed to the lower end surface of the carrier; the spring and the carrier are riveted together; the outer frame of the spring is riveted to the base; the iron shell and the base are bonded together; one side of the light-shielding sticker is bonded to the lens, and the other side is bonded to the iron shell; after the carrier is energized, an electromagnetic force is generated along the optical axis under the action of the magnetic field of the driving magnet, and the photosensitive chip on the module is pushed to a required position through the balance of the electromagnetic force and the reverse elastic force provided by the flexible circuit board and the spring on the module.

[0007] The beneficial effects of the present invention are:

[0008] The present invention adopts a dynamic imaging module solution. Since the distance from the dynamic imaging surface to the lens requires a smaller movement space than that of the dynamic lens solution, the entire camera module can be made very thin, and automatic focus of the mobile phone front camera can be achieved. At the same time, due to the dynamic module solution, more light can be received by the photosensitive chip of the module, thereby achieving the purpose of high pixels of the front camera, which will break the situation where the traditional front camera cannot achieve focus. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The exploded view of the pan / tilt automatic zoom voice coil motor of the present invention is shown.

[0010] Figure 2 The diagram is a schematic diagram of the upper half of a pan / tilt automatic zoom voice coil motor according to the present invention.

[0011] Figure 3 The present invention is a schematic diagram of the lower half of a pan / tilt automatic zoom voice coil motor.

[0012] Figure 4 This is a schematic diagram of a finished product of a pan-tilt automatic zoom voice coil motor of the present invention. DETAILED DESCRIPTION

[0013] The following is combined with Figure 1-4 The present invention is further explained in detail by the accompanying drawings.

[0014] like Figure 1 As shown: a pan-tilt automatic zoom voice coil motor includes 9 parts: a lens 1, a light-shielding sticker 2, an iron shell 3, a spring 4, a carrier winding 5, a module 6, a cover plate 7, a driving magnet 8, and a base 9.

[0015] like Figure 2 As shown: the upper part of a pan / tilt automatic zoom voice coil motor includes: an iron shell 3 and a driving magnet 8; the iron shell 3 is made of magnetic conductive material; on the optical axis of the lens 1, the inner side of the upper surface contains an optical path through hole 10, and the driving magnet 8 is glued to the inner side of the iron shell 3 by glue to provide a stable magnetic field for the driving coil 16; a stepped structure is left on the outer side wall of the iron shell 3 to protect the flexible circuit board 18 on the module 6.

[0016] like Figure 3As shown: the lower part of a pan / tilt automatic zoom voice coil motor, including: a spring piece 4, a carrier winding 5, a module 6, a cover plate 7, a driving magnet 8, and a base 9. The driving coil 16 is wound around one of the winding posts 17 of the carrier 5 as a starting line, and is wound around the coil side limiting boss 20 through the wire groove, and after winding around the other side limiting boss 20, it returns to the other winding post 17 as an ending line; the module 6 is bonded to the groove at the bottom of the carrier 5; the cover plate 7 is bonded to the limiting groove of the base 9 for sealing and light isolation;

[0017] Assemble the spring clip 4 to the carrier positioning column 14 of the carrier winding 5 and fix it by riveting; assemble the outer frame of the spring clip 4 to the base positioning column 14 of the base 9, and after riveting, weld the pad 13 of the spring clip 4 and the coil on the winding column 14 together; weld the spring clip 4 and the built-in metal terminal 19 of the base 9 together, and now the current passes through the metal terminal 19 in the base 9, the spring clip 4, the winding column 17 on the carrier 5, the driving coil 16, the spring clip 4 on the other side, and the metal terminal 19 on the other side to form a complete circuit; after powering the metal terminal 19, the driving coil 16 moves up and down due to the electromagnetic force under the magnetic field generated by the driving magnet 8, and at the same time, the spring clip 4 and the flexible circuit board 18 on the module 6 provide reverse elastic force, and finally the carrier 5 stops at the required focusing position due to the balance of the three forces of electromagnetic force, self-gravity and elastic force, thereby realizing the focusing function.

[0018] like Figure 4 As shown: finally, the upper and lower parts are assembled together, and finally the lens 1 and the light-isolating sticker 2 are bonded to the upper surface of the iron shell 3 to form a pan-tilt automatic zoom voice coil motor mentioned in the present invention.

[0019] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A pan / tilt automatic zoom voice coil motor, characterized in that: include: Lens (1), light-shielding sticker (2), iron shell (3), spring piece (4), carrier (5), module (6), cover plate (7), driving magnet (8), base (9); The driving magnet (8) is bonded to the inner wall of the iron shell (3); The cover plate (7) is fixed on the base (9); The module (6) is fixed together with the lower end surface of the carrier (5); the spring sheet (4) is fixed together with the carrier (5) by riveting; the outer frame of the spring sheet (4) is riveted to the base (9); the iron shell (3) is bonded to the base (9); one side of the light-isolating sticker (2) is bonded to the lens (8), and the other side is bonded to the iron shell (3); after the carrier (5) is energized, an electromagnetic force is generated along the optical axis under the action of the magnetic field of the driving magnet (8), and the electromagnetic force is balanced with the reverse elastic force provided by the flexible circuit board and the spring sheet (4) on the module (6), so that the photosensitive chip on the module (6) is pushed to a required position; The iron shell (1) is made of magnetic conductive material, and the side is provided with an iron shell (1) for protecting the soft board of the module (6). The iron shell (1) for protecting the module (6) and the iron shell (1) for protecting the internal driving structure are integrally stamped and are in a stepped shape; a light-through hole is left on the upper surface; The base (9) adopts an injection molding structure, and is inlaid with metal terminals inside. The metal terminals extend from one side of the base (9) to supply power to the carrier (5). The current passes through the metal terminals in the base (9), the spring sheet (4) on one side, the winding column on the carrier (5), the driving coil, the spring sheet (4) on the other side, and the metal terminals on the other side to form a complete circuit; a limiting groove for limiting the bonding cover plate (7) is provided at the bottom of the base (9); bosses are pulled up at the four corners, and positioning columns are provided on the top of the bosses for riveting and fixing the spring sheet (4); a platform is pulled out from the side of the base (9) to protect the module (6); When powered on, the carrier (5) generates an upward force, which is balanced with the elastic force provided by the spring sheet (4), the flexible circuit board in the module (6) and its own gravity, thereby achieving the purpose of precise positioning.

2. The pan / tilt automatic zoom voice coil motor according to claim 1, characterized in that: A through hole is reserved in the middle of the carrier (5) for passing the optical path; the winding wire is evenly wound on the winding bosses on both sides of the carrier (5) by side winding; the upper surface of the carrier (5) is designed with a riveted column for fixing the spring sheet (4); the lower part is reserved with a limiting groove for limiting the fixation and bonding of the module (6); and limiting bosses are reserved on the upper, lower and side surfaces of the carrier (5).

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