JP3142643U - Lens actuator - Google Patents

Abstract

The present invention provides a lens operating device that can provide advantages such as downsizing, high operating speed, quietness, and low cost.
A lens operating device applied to driving a lens of a micro photographing module includes a lens mounting seat, a first hollow magnet, a hollow magnetically permeable sheet, a second hollow magnet, and an air-core coil. The sheet has a first magnetic pole surface and a second magnetic pole surface, the first magnetic pole surface is magnetically coupled to the first hollow magnet, and the second magnetic pole surface is magnetically coupled to the second hollow magnet. The air-core coil is arranged with a sliding clearance on the outer periphery or inner edge of the magnetically coupled lens mounting seat, the first hollow magnet, the hollow magnetic permeable sheet and the second hollow magnet, and the lens mounting seat is the first hollow magnet. Alternatively, a movable member is configured by fixedly connecting air core coils.
[Selection] Figure 2

Description

  The present invention relates to a lens actuating device, and more particularly to an actuating device used for driving a micro photographing module lens.

  In recent years, it has become increasingly popular to mount photographing modules on behavioral devices and portable devices. Due to more desirable functions and downsizing needs for behavioral devices in the product market, both higher image quality and downsizing are also required for imaging modules. In order to improve the shooting image quality, the pixels from VGA class 300,000, 2 million, 3 million, 4 million and 5 million pixels according to the market trend of behavioral device shooting modules It has developed into a high class. In addition to the improvement in pixels, the clarity of shooting is also attracting attention. For this reason, the photographing module of the behavioral apparatus also develops from a fixed focus photographing function to an optical autofocus function similar to a camera and an optical zoom function.

  The operating principle of the optical autofocus function is to move the lens of the shooting module appropriately according to the distance from the shooting object, and to focus the optical image of the shooting object accurately on the image detector, and to display a clear image Is generated. In a general-purpose photographing module, examples of the operation method for moving the lens include stepping motor operation, piezoelectric operation, and voice coil linear operation. Voice coil linear actuation is relatively easy to manufacture because it is fast and does not require the use of high precision screw rods for direct linear actuation. Further, since it can be designed to be combined with the imaging module and the entire space is arranged in the electromagnetic field, the volume of the entire imaging module can be reduced. However, in order to obtain a sufficient operating force to move the lens with a reduction in the overall volume, it is necessary to effectively generate a sufficient operating force with a limited magnetic source by a good magnetic path design. Is done.

  FIG. 1 is a conceptual diagram of a conventional voice coil motor magnetic path structure. A magnetic path member of a conventional voice coil motor (VCM) 1 includes two non-annular magnets 111 and 112, two non-annular surface yokes 121 and 122, and a bottom yoke 13 having a central annular wall. It is configured by extending and stacking along the voice coil motor axial direction. The magnetic path member of the conventional voice coil motor 1 generates a magnetic force line 15 by forming a closed magnetic path. The magnetic field lines 15 originate from the upper surfaces of the two non-annular magnets 111 and 112, pass through the two non-annular surface yokes 121 and 122 to the inner ring air gap 14, and follow the central annular wall of the bottom yoke 13. Further, the bottom yoke 13 is guided to return to the lower surfaces of the two non-annular magnets 111 and 112. According to such a closed magnetic circuit design, the two non-annular surface yokes 121 and 122 guide the magnetic lines 15 generated from the two non-annular magnets 111 and 112 and concentrate the magnetic lines 15 to generate a sufficient operating force. Effect is obtained.

  The voice coil motor 1 operates by guiding the magnetic field lines 15 through a coil (not shown) with a yoke. However, the arrangement of the yoke causes manufacturing difficulties and the arrangement of other elements. Is also limited, making it difficult to reduce the size.

  The inventor proposes the present invention in which the above drawbacks are carefully researched and developed, and the theory can be utilized to improve the above disadvantages in a rational and effective manner.

  The present invention provides a lens actuating device that is effective and optimal for the operation of a photographing module lens by using a voice coil type linear operation to meet the needs of the space limitation of the lens arrangement of the photographing module and the movement characteristics of the lens. The photographing module to which the lens operating device according to the present invention is applied can obtain advantages such as downsizing, high operating speed, quietness and low cost.

  A lens operating device according to the present invention includes a lens mounting seat, a first hollow magnet, a hollow magnetic permeable sheet, a second hollow magnet, and an air-core coil. The hollow permeable sheet includes a first magnetic pole surface and a second magnetic pole surface. The first magnetic pole surface is magnetically coupled to the first hollow magnet, and the second magnetic pole surface is magnetically coupled to the second hollow magnet. The air-core coil is disposed with a sliding gap on the outer periphery or inner edge of the magnetically coupled lens mounting seat, the first hollow magnet, the hollow magnetically permeable sheet, and the second hollow magnet. The lens mounting seat constitutes a movable member by fixedly connecting the first hollow magnet or the air-core coil.

  The first hollow magnet and the second hollow magnet are magnetically coupled to the hollow magnetically permeable sheet with the same polarity. The hollow magnetic permeable sheet absorbs and collects the magnetic lines of force generated from the first hollow magnet and the second hollow magnet, and then passes the magnetic lines through the air-core coil. When the magnetic field line passes through the air core coil, it interacts with an electromagnetic field generated by conducting the air core coil to generate an electromagnetic pressing force, thereby operating the movable member.

  The features and technical contents of the present invention will be described below with reference to the drawings, but the present invention is not limited thereby.

  FIG. 2 is a conceptual diagram of the magnetic path structure of the lens actuator (also referred to as a lens actuator) according to the first embodiment of the present invention. The lens operating device 2 according to the present invention includes a mounting seat 21 for mounting a lens, a first hollow magnet 22, a hollow magnetically permeable sheet 23, a second hollow magnet 24, an air core coil 25, and at least one of them. A fixed shaft 26 and a bottom seat (bottom base) 27 are provided. As shown in FIG. 2, the first hollow magnet 22 is fixed to the lens mounting seat 21, and a lens (not shown) for photographing is disposed on the lens mounting seat 21. The hollow magnetically permeable sheet 23 has a first magnetic pole surface and a second magnetic pole surface, the first magnetic pole surface is magnetically coupled to the first hollow magnet 22, and the second magnetic pole surface is magnetically coupled to the second hollow magnet 24. Yes.

  The air-core coil 25 is arranged with a sliding clearance around the outer periphery of the lens mounting seat 21, the first hollow magnet 22, the hollow magnetic permeable sheet 23, and the second hollow magnet 24 that are magnetically coupled. The lens mounting seat 21, the first hollow magnet 22, the hollow magnetic permeable sheet 23, and the second hollow magnet 24 form a movable member, and the air-core coil 25 is fixed to the bottom seat 27 to constitute a non-movable member.

  As shown in FIG. 2, the first hollow magnet 22 and the second hollow magnet 24 are magnetically coupled to the hollow magnetically permeable sheet 23 with the same engagement polarity. The hollow magnetic permeable sheet 23 absorbs the magnetic lines Φ1 and Φ2 emitted from the first hollow magnet 22 and the second hollow magnet 24 and guides the absorbed magnetic lines Φ1 and Φ2 through the air core coil 25. As a result, the magnetic lines of force Φ1 and Φ2 interact with the electromagnetic field generated by the air core coil 25 by electrical conduction, thereby generating an electromagnetic pressing force to operate the movable member.

  Since the first hollow magnet 22 and the second hollow magnet 24 are magnetically attached to the hollow magnetically permeable sheet 23 with the same polarity, the generated magnetic lines of force Φ1 and Φ2 are mutually discharged and are not affected by each other. The magnetic lines of force Φ1 and Φ2 are absorbed by the hollow magnetically permeable sheet 23 and concentrated. The magnetic lines of force Φ1 and Φ2 are emitted from the N pole of the first hollow magnet 22 and the N pole of the second hollow magnet 24, respectively, and are guided by the hollow magnetically permeable sheet 23 toward the air gap formed by the sliding gap. And through the air-core coil 25, return to the S pole of the first hollow magnet 22 and the S pole of the second hollow magnet 24, respectively. As a result, two closed magnetic paths are formed. When the magnetic field lines Φ1 and Φ2 pass through the air core coil 25, the magnetic field lines Φ1 and Φ2 can interact with the electromagnetic field generated by the electric conduction of the air core coil 25 to generate an electromagnetic pressing force.

  In the present invention, the magnetic field lines Φ1 and Φ2 emitted from the two hollow magnets 22 and 24 are concentrated and guided by the hollow magnetic permeable sheet 23 and are effectively passed through the air core coil 25, thereby generating the magnetic fluxes from the two hollow magnets 22 and 24. The magnetic lines of force Φ1 and Φ2 effectively apply a sufficient operating force without leaking and move the lens.

  Further, since the first hollow magnet 22 and the second hollow magnet 24 are magnetically coupled to the hollow magnetically permeable sheet 23 with the same polarity, the magnetic force lines Φ1 and Φ2 emitted from the first hollow magnet 22 and the second hollow magnet 24 have a draining force. This design can prevent the influence of magnetic flux linkage.

  Further, at least one fixed shaft 26 (two are illustrated in FIG. 2) of the lens operating device 2 according to the present invention serves as a sliding guide when the movable member slides up and down. The fixed shaft 26 is made of a magnetically permeable material. The lens operating device 2 according to the present invention may use the fixed shaft 26 as a sliding guide for the movable member, or may use a suspension member (not shown) as the sliding guide for the movable member.

  Here, the fixed shaft 26 will be described as an example. The fixed shaft 26 that can be permeable is attached to a hole formed in the lens mounting seat 21 so that the contact surface with the hole has almost tight and slight play. A gap is also maintained between the air-core coil 25 and the air-core coil 25. The magnetic lines of force Φ1 and Φ2 emitted from the first hollow magnet 22 and the second hollow magnet 24 are concentrated by the hollow magnetic permeable sheet 23, pass through the air-core coil 25, and are coupled to the fixed shaft 26 and magnetic flux linkage that can be permeable through a gap. By doing so, a closed magnetic loop is formed and a preload magnetic force is generated. The lens mounting seat 21 slides along the contact surface with the fixed shaft 26 by the resultant moment composed of the preload magnetic force, thereby realizing a sliding motion without shaking.

  The lens operating device 2 according to the present invention may control the lens localization by using a lens localization means (not shown). The lens localization means includes a control line and a preload generating element, and controls the movement of the movable member of the present invention. The control line may be an open loop control line or a closed loop control line, and the preload generating element may be any of a linear preload generating element, a magnetic preload generating element, and a piezoelectric sheet preload generating element.

  In addition, the lens localization means used in the lens operating device 2 according to the present invention may be composed of a control line and a shift detection element. The control line is a closed loop control line, and the shift detection element may be any of a light induction type shift detection element, a magnetic induction type shift detection element, and a piezoelectric induction type shift detection element.

  FIG. 3 is a conceptual diagram of the magnetic path structure of the lens operating device according to the second embodiment of the present invention. In the lens actuator 2a of the second embodiment of the present invention, the same elements as those of the lens actuator 2 of the first embodiment are denoted by the same reference numerals. The operation principle and effect of the magnetic path and electric circuit of the second embodiment are the same as those of the first embodiment, but the second embodiment is different from the first embodiment in that the first hollow magnet 22 of the first embodiment is not provided in the second embodiment. The magnetic field line Φ2 is provided only by the two hollow magnets 24. The hollow magnetic permeable sheet 23 absorbs the magnetic lines of force Φ <b> 2 emitted from the second hollow magnet 24 and allows the magnetic lines of force Φ <b> 2 to pass through the air core coil 25. The magnetic field line Φ2 interacts with the electromagnetic field generated by conducting the air-core coil 25, thereby generating an electromagnetic pressing force and operating the movable member.

  In the lens operating device 2a of the second embodiment of the present invention, the magnetic force line Φ2 is emitted from the N pole of the second hollow magnet 24, concentrated by the hollow magnetic permeable sheet 23, and slid by the guide of the hollow magnetic permeable sheet 23. Heading to the air gap formed by the gap, the line of magnetic force Φ2 passes through the air gap and the air core coil 25 and then returns to the S pole of the second hollow magnet 24, thereby forming a closed magnetic circuit. When the magnetic field line Φ2 passes through the air core coil 25, it interacts with the electromagnetic field generated by the air core coil 25 being electrically conducted to generate an electromagnetic pushing force.

  FIG. 4 is a conceptual diagram of the magnetic path structure of the lens operating device according to the third embodiment of the present invention. The operation principle and effect of the magnetic path and electric circuit of the third embodiment are the same as those of the first embodiment, but the main difference is that the magnetic path structure of the lens operating device 2 in the first embodiment is the same. The ring-shaped hollow magnets (22, 24), the ring-shaped hollow magnetically permeable sheet 23, and the ring-shaped air core coil 25 are configured. In the third embodiment, the magnetic path structure of the lens actuator 2b is a square hollow magnet (32 , 34), a square hollow magnetic permeable sheet 33 and a square air core coil 35.

  FIG. 5 is a conceptual diagram of the magnetic path structure of the lens operating device according to the fourth embodiment of the present invention. In the lens actuator 2c of the fourth embodiment of the present invention, the same elements as those of the lens actuator 2 of the first embodiment are denoted by the same reference numerals. The operation principle and effect of the magnetic path and electric circuit of the fourth embodiment are the same as those of the first embodiment. However, in comparison, the air core coil 25 is fixed to the lens mounting seat 21 in the fourth embodiment. In addition, the first hollow magnet 22, the magnetically permeable sheet 23, and the second hollow magnet 24 that are magnetically coupled to each other are disposed at the inner edge with a gap therebetween, and the movable member is formed by the lens mounting seat 21 and the air core coil 25. The first hollow magnet 22, the hollow magnetic permeable sheet 23, and the second hollow magnet 24 are formed on the bottom seat 27 to form a non-movable member.

  FIG. 6 is a conceptual diagram of the magnetic path structure of the lens operating device according to the fifth embodiment of the present invention. In the lens actuator 2d according to the fifth embodiment of the present invention, the same elements as those in the lens actuator 2c according to the fourth embodiment are denoted by the same reference numerals. The operation principle and effect of the magnetic path and electric circuit of the fifth embodiment are the same as those of the fourth embodiment, but the main difference is that the fifth embodiment is different from the second hollow magnet of the fourth embodiment in comparison. There is no 24, and the magnetic force line Φ1 is provided only by the first hollow magnet 22. Similarly, the line of magnetic force Φ1 emitted from the first hollow magnet 22 is absorbed by the hollow magnetically permeable sheet 23 and passes through the air core coil 25 to interact with the electromagnetic field generated by the air core coil 25 being conducted. Thus, an electromagnetic pressing force is generated to operate the movable member.

  FIG. 7 is a conceptual diagram of the magnetic path structure of the lens operating device according to the sixth embodiment of the present invention. In the lens actuator 2e of the sixth embodiment of the present invention, the same elements as those of the lens actuator 2d of the fifth embodiment are denoted by the same reference numerals. The operation principle and effect of the magnetic path and electric circuit of the sixth embodiment are the same as those of the fifth embodiment. However, if compared, the main difference is that the first hollow magnetic permeable sheet 23 and the second are different in the sixth embodiment. The hollow magnetic permeable sheet 29 is where the first magnetic pole surface and the second magnetic pole surface of the first hollow magnet 22 are magnetically coupled. The first hollow magnetic permeable sheet 23 and the second hollow magnetic permeable sheet 29 constitute a non-movable member together with the first hollow magnet 22.

  In the lens actuator 2e of the sixth embodiment of the present invention, the magnetic force line Φ1 is emitted from the N pole of the first hollow magnet 22, is absorbed and concentrated in the first hollow magnetic permeable sheet 23, and is guided by the hollow magnetic permeable sheet 23. It goes to the air gap formed by the sliding gap, passes through the air gap and the air core coil 25, and is concentrated by the absorption of the second hollow magnetic permeable sheet 29, and is guided by the second hollow magnetic permeable sheet 29. Return to the south pole of the hollow magnet 22. Thereby, a closed magnetic circuit is formed. When the magnetic field line Φ1 passes through the air core coil 25, it interacts with the electromagnetic field generated by the air core coil 25 being conducted, thereby generating an electromagnetic pressing force to operate the movable member.

  As described above, according to the present invention, the two hollow magnets arranged so that the magnetic poles face each other are provided concentrically with the lens optical axis on the outer periphery of the lens. The hollow magnetically permeable sheet is disposed between the two hollow magnets, absorbs the magnetic lines generated from the opposing magnetic poles of the two hollow magnets, and deflects the absorbed magnetic lines in a direction perpendicular to the optical axis. An air-core coil is further arranged on the outer periphery of the two hollow magnets. The two hollow magnets are slidably arranged with an air core coil and a sliding gap.

  According to the above arrangement, the magnetic field lines generated from the hollow magnet are deflected in a direction perpendicular to the optical axis by the hollow magnetic permeable sheet, and further pass through the air core coil to generate an electromagnetic field generated by conducting the air core coil. Interacting with each other generates possible electromagnetic pushing forces that actuate the lens. Therefore, the present invention can effectively use magnetic lines of force generated from a small magnet in a limited space, and generate a sufficient electromagnetic pressing force to operate the lens.

  Therefore, the present invention has a requirement to be able to receive a utility model registration, and applies for a request for utility model registration based on the Patent Law.

  The above is only a preferred embodiment of the present invention, and the present invention is not limited thereby, and equivalent modifications made based on the scope of claims of the invention registration and the contents of the specification according to the present invention. All modifications and changes are included in the scope of the claim for registration of the present invention.

The conventional voice coil motor magnetic path structure conceptual diagram. The magnetic path structure conceptual diagram of the lens actuator of 1st Embodiment of this invention. The magnetic path structure conceptual diagram of the lens actuator of 2nd Embodiment of this invention. The magnetic path structure conceptual diagram of the lens actuator of 3rd Embodiment of this invention. The magnetic path structure conceptual diagram of the lens actuator of 4th Embodiment of this invention. The magnetic path structure conceptual diagram of the lens actuator of 5th Embodiment of this invention. The magnetic path structure conceptual diagram of the lens actuator of 6th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Voice coil motor 111, 112 Non-annular magnet 121, 122 Non-annular surface yoke 13 Bottom yoke 14 Air gap 15 Magnetic field line 2, 2a, 2b, 2c, 2d, 2e Lens actuator 21 Lens mounting seat 22, 32 1st hollow magnet 24, 34 Second hollow magnets 23, 33 Hollow magnetically permeable sheets 25, 35 Air-core coil 26 Fixed shaft 27 Bottom seats Φ1, Φ2 Magnetic field lines

Claims (28)

A first hollow magnet;
A hollow magnetically permeable sheet having a first magnetic pole surface and a second magnetic pole surface, wherein the first magnetic pole surface is magnetically coupled to the first hollow magnet;
A second hollow magnet magnetically coupled to the second magnetic pole surface of the hollow magnetically permeable sheet;
The first hollow magnet magnetically coupled, the hollow magnetic permeable sheet, and the outer periphery of the second hollow magnet are arranged with a sliding gap, or the first hollow magnet, the hollow magnetic permeable sheet, An air-core coil disposed on an inner edge of the second hollow magnet;
A lens operating device comprising: a lens mounting seat for fixedly connecting the first hollow magnet or the air-core coil.   The lens operating device according to claim 1, wherein the first hollow magnet and the second hollow magnet are magnetically coupled to the first magnetic pole surface and the second magnetic pole surface of the hollow magnetically permeable sheet with the same polarity. .   The lens mounting seat, the first hollow magnet, the hollow magnetic permeable sheet, and the second hollow magnet constitute a movable member, or the lens mounting seat and the air-core coil constitute a movable member. The lens actuator according to claim 1.   Further, a bottom seat is provided, and the air-core coil is fixed by the bottom seat to constitute a non-movable member, or the first hollow magnet, the hollow magnetic permeable sheet, and the second hollow magnet are fixed by the bottom seat, and the non-movable member The lens operating device according to claim 3, comprising:   The hollow magnetically permeable sheet absorbs the magnetic lines of force generated from the first hollow magnet and the second hollow magnet, passes the magnetic lines through the air core coil, and causes the magnetic field lines to interact with the electromagnetic field generated by the conduction of the air core coil. The lens actuating device according to claim 1, wherein an electromagnetic pushing force is generated.   The lens operating device according to claim 4, further comprising at least one fixed shaft that is connected between the bottom seat and the lens mounting seat and serves as a sliding guide for the movable member.   The lens operating device according to claim 6, wherein the at least one fixed shaft is made of a magnetically permeable material.   The lens operating device according to claim 4, further comprising a suspension member that slides and guides the movable member.   5. The lens operating device according to claim 4, further comprising a lens localization unit that includes a control line and a preload generating element and controls movement of the movable member.   The lens operating device according to claim 9, wherein the control line is an open loop control line or a closed loop control line.   The lens operating device according to claim 9, wherein the preload generating element is one of a linear preload generating element, a magnetic preload generating element, and a piezoelectric sheet preload generating element.   5. The lens operating device according to claim 4, further comprising a lens localization unit configured to control a movement of the movable member, the control line being configured by a control line and a shift detecting element.   The lens operating device according to claim 12, wherein the control line is a closed loop control line.   The lens operating device according to claim 12, wherein the shift detection element is one of a light induction shift detection element, a magnetic induction shift detection element, and a piezoelectric induction shift detection element. A hollow magnet,
A first hollow permeable sheet magnetically coupled to the first magnetic pole surface of the hollow magnet;
An air-core coil disposed at the outer periphery of the magnetically coupled hollow magnet and the first hollow magnetic permeable sheet with a sliding gap, or disposed at an inner edge of the hollow magnet and the hollow magnetic permeable sheet;
A lens operating device comprising: a lens mounting seat for fixedly connecting the hollow magnet or the air-core coil.   16. The lens mounting seat, the hollow magnet, and the first hollow magnetic permeable sheet constitute a movable member, or the lens mounting seat and the air-core coil constitute a movable member. The lens operating device according to 1.   Further, a bottom seat is provided, and the air-core coil is fixed by the bottom seat to constitute a non-movable member, or the hollow magnet and the first hollow magnetic permeable sheet are fixed by the bottom seat to constitute a non-movable member. The lens actuator according to claim 16, wherein   The first hollow magnetically permeable sheet absorbs the magnetic field lines generated from the hollow magnet, passes the magnetic field lines through the air core coil, and electromagnetically pushes the magnetic field lines by interacting with the electromagnetic field generated by conducting the air core coil. The lens operating device according to claim 17, wherein a force is generated to operate the movable member.   The lens operating device according to claim 17, further comprising at least one fixed shaft provided between the bottom seat and the lens mounting seat to guide the movable member to slide.   The lens operating device according to claim 19, wherein the at least one fixed shaft is made of a magnetically permeable material.   The lens operating device according to claim 17, further comprising a suspension member that guides sliding of the movable member.   The lens actuating device according to claim 17, further comprising a lens localization means for controlling movement of the movable member, comprising a control line and a preload generating element.   The lens operating device according to claim 22, wherein the control line is an open loop control line or a closed loop control line.   23. The lens operating device according to claim 22, wherein the preload generating element is one of a linear preload generating element, a magnetic preload generating element, and a piezoelectric sheet preload generating element.   18. The lens operating device according to claim 17, further comprising a lens localization unit configured to control a movement of the movable member, the control line being configured by a control line and a shift detection element.   26. The lens operating device according to claim 25, wherein the control line is a closed loop control line.   26. The lens operating device according to claim 25, wherein the shift detection element is one of a light induction shift detection element, a magnetic induction shift detection element, and a piezoelectric induction shift detection element.   And a second hollow magnetically permeable sheet that is magnetically coupled to the second magnetic pole surface of the hollow magnet, wherein the second hollow permeable sheet, the hollow magnet, and the first hollow permeable sheet constitute a non-movable member. The lens actuator according to claim 17.

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