WO2022065760A1 - 줌 구동 액추에이터 및 줌 구동을 위한 위치제어방법 - Google Patents
줌 구동 액추에이터 및 줌 구동을 위한 위치제어방법 Download PDFInfo
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- WO2022065760A1 WO2022065760A1 PCT/KR2021/012257 KR2021012257W WO2022065760A1 WO 2022065760 A1 WO2022065760 A1 WO 2022065760A1 KR 2021012257 W KR2021012257 W KR 2021012257W WO 2022065760 A1 WO2022065760 A1 WO 2022065760A1
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- Prior art keywords
- carrier
- magnet
- optical axis
- axis direction
- facing
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
- G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
- G03B3/10—Power-operated focusing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/51—Housings
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0007—Movement of one or more optical elements for control of motion blur
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0046—Movement of one or more optical elements for zooming
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0053—Driving means for the movement of one or more optical element
- G03B2205/0069—Driving means for the movement of one or more optical element using electromagnetic actuators, e.g. voice coils
Definitions
- the present invention relates to a zoom driving actuator and a method for controlling a position, and more particularly, to an actuator having further improved driving precision according to an extended moving distance of a lens.
- an actuator for a zoom lens capable of variously changing the size of a subject by adjusting the focal length through zoom-in and zoom-out functions, etc. has been disclosed.
- An actuator that implements a zoom function more diversely by applying the mutual positional relationship of lenses (lens assembly) in combination is also disclosed.
- the movement distance (also referred to as a stroke) of the zoom lens moving in the optical axis direction is extended or extended than that of a general lens. should be designed to accurately detect and control feedback.
- the present invention has been devised to solve the above-mentioned problems in the background as described above, and the spatial utilization of the actuator can be implemented more effectively, as well as accurate position detection in a longer stroke range using the interrelationship of a plurality of hall sensors It is an object of the present invention to provide a zoom driving actuator in which driving precision is further improved accordingly.
- a zoom driving actuator for achieving the above object includes a first carrier mounted with a first lens and moving in an optical axis direction; a second carrier on which a second lens is mounted and moving in the optical axis direction from above or below the first carrier with respect to the optical axis direction; a housing accommodating the first carrier and the second carrier; a first magnet mounted on the first carrier; a second magnet mounted on the second carrier; a first coil portion provided in the housing and facing the first magnet; a second coil part provided in the housing and facing the second magnet; and balls respectively disposed between the housing and the first carrier and between the housing and the second carrier.
- the first carrier of the present invention includes a first mounter on which the first lens is mounted; and a first support part provided on one of the left or right sides of the first mounter and having a shape extending from the first mounter with respect to the optical axis direction, and from a corresponding point of view, the second carrier of the present invention is a second mounter on which the second lens is mounted; and the left side or the right side of the second mounter, provided on the opposite side to which the first support part is provided, and has a shape that is longer than the second mounter with respect to the optical axis direction, in a direction opposite to the extension direction of the first support part It may be configured to include a second support having an extended shape.
- the first coil part or the second coil part of the present invention may be composed of n (n is a natural number greater than or equal to 2) coils arranged vertically in the optical axis direction.
- the first magnet or the second coil part of the present invention The two magnets may be configured such that magnetic poles facing the first coil part or the second coil part consist of n+1 magnetic poles.
- the first carrier of the present invention includes a first rail formed on the first support; and a second rail formed on a portion of the first mounter that is not provided with the first support portion, wherein the second carrier of the present invention includes: a third rail formed on the second support portion; and a fourth rail formed on a portion of the second mounter where the second support part is not provided.
- the housing of the present invention may include: a first guide rail facing the first rail and formed in plurality; a third guide rail facing the third rail and formed in plurality; It may include second and fourth guide rails facing each of the second and fourth rails, and the ball of the present invention is between the first to fourth rails and the first to fourth guide rails, respectively. can be placed in
- first to fourth guide rails are arranged side by side in the optical axis direction.
- the first guide rail is formed on either one of the left or right sides of the housing, and the third guide rail is on the left side of the housing.
- the first guide rail is formed on the other side of the right side where the first guide rail is not formed, the second guide rail is formed inside the third guide rail, and the fourth guide rail is formed inside the first guide rail.
- the present invention may further include a plurality of Hall sensors provided at positions having different distances from the magnetic pole boundary of the first magnet with respect to the optical axis direction.
- the plurality of hall sensors of the present invention are arranged vertically with respect to the optical axis direction, and it is preferable to be configured to be arranged on the same line parallel to the optical axis direction.
- the number of magnetic poles facing the first coil part may be m (m is a natural number greater than or equal to 3). In this case, it is more preferable to be configured to be disposed at a position facing the same pole among the m poles.
- a zoom driving position control method for achieving another object of the present invention, a first lens and a first magnet are mounted, and a first carrier, a second lens and a second magnet moving in the optical axis direction are mounted, and based on the optical axis direction A second carrier moving in the optical axis direction from an upper or lower portion of the first carrier, a first coil portion facing the first magnet, a second coil portion facing the second magnet, and facing the first magnet
- a method for controlling a position of a zoom driving actuator including a plurality of Hall sensors the method comprising: a signal input step of receiving output signals from each of the plurality of Hall sensors; a position signal generating step of generating a position signal of the first carrier by calculating the output signal; and a position control step of controlling the position of the first carrier by using the position signal.
- the plurality of Hall sensors are configured to be provided at different distances from the magnetic pole boundary of the first magnet based on the optical axis direction.
- the first magnet may have m magnetic poles facing the first coil unit (m is a natural number greater than or equal to 3).
- the position signal generating step of the present invention comprises the initial position of the first carrier. At the time of position, when the plurality of Hall sensors face the same magnetic pole of the first magnet together, the output signal is summed, and when the plurality of Hall sensors face different magnetic poles of the first magnet, respectively, the output It may be configured to subtract a signal.
- the physical structures of the plurality of carriers to be symmetrical in opposite directions to each other, it is possible to sufficiently secure the independent respective movement ranges of each lens (lens assembly) mounted on each carrier.
- the overall structure and shape of the device can be implemented in a more space-intensive form, the overall space can be minimized and the mobile terminal can be further optimized through this.
- a magnet of sufficient size can be provided in each carrier, thereby increasing the driving force of each carrier. can be enhanced more effectively.
- the magnet and the coil generating the driving force of each of the plurality of carriers can be completely separated into one side and the other side, so that the magnetic forces for driving each of the carriers in the entire stroke section do not interfere with each other Therefore, the driving performance can be implemented more clearly and precisely.
- the magnet is implemented in a form in which three or more magnetic poles are exposed, and a plurality of Hall sensors are arranged vertically based on the optical axis, but the lens is formed by differentiating the separation distance based on the magnetic pole boundary of the magnet.
- Each position detection according to the movement of each mounted carrier and feedback position control using the same can be implemented more precisely.
- FIG. 1 is a view showing the overall configuration of a zoom driving actuator and a camera module according to a preferred embodiment of the present invention
- FIG. 2 is a view showing the overall configuration of a zoom driving actuator according to a preferred embodiment of the present invention
- FIG. 3 is a view showing the detailed configuration of the first carrier and the housing according to an embodiment of the present invention.
- FIG. 4 is a view showing the detailed configuration of the second carrier and the housing according to an embodiment of the present invention.
- FIG. 5 is a view showing a guide rail structure formed in the housing
- FIG. 6 is a view showing a rail structure formed on the first and second carriers
- FIG. 7 is a view for explaining the positional relationship between a plurality of hall sensors and a magnet according to the present invention.
- FIG. 8 is a view showing output signals of a plurality of Hall sensors and their calculated signal systems
- FIG. 9 is a block diagram showing a detailed configuration of a position control device according to an embodiment of the present invention.
- FIG. 10 is a flowchart illustrating a process of a position control method for zoom driving performed in the position control device of the present invention.
- FIG. 1 is a diagram illustrating the overall configuration of a zoom driving actuator (hereinafter referred to as an 'actuator') 100 and a camera module 1000 according to a preferred embodiment of the present invention.
- the actuator 100 of the present invention may be implemented as a single device by itself, and may also be implemented as a camera module 1000 including a reflectometer module 200 and the like as shown in FIG. 1 .
- the actuator 100 of the present invention corresponds to an actuator that implements auto focus (AF) or zoom by linearly moving each of a plurality of carriers on which a lens (lens assembly) is mounted in the optical axis direction, as will be described later. do.
- AF auto focus
- zoom by linearly moving each of a plurality of carriers on which a lens (lens assembly) is mounted in the optical axis direction, as will be described later. do.
- the reflectometer module 200 which may be provided in front (based on the optical axis direction) of the actuator 100 according to the present invention, reflects or refracts the light path Z1 of the subject to the path Z in the lens direction. perform the function As described above, the light reflected or refracted in the optical axis direction is introduced into an image sensor such as CMOS or CCD through a lens (lens assembly) provided in the carrier.
- the reflectometer module 200 for changing the path of light may include a reflectometer 210 that may be formed of one selected from a mirror or a prism or a combination thereof.
- the reflectometer 210 may be implemented by various members capable of changing the light entering from the outside in the optical axis direction, but is preferably implemented with a glass material in order to improve optical performance.
- the camera module 1000 of the present invention including the reflectometer module 200 and the like is configured to refract the path of light so that light flows in the lens direction, so the device itself is not installed in the thickness direction of the portable terminal but in the longitudinal direction. Since it can be installed, the thickness of the portable terminal is not increased, and thus the portable terminal can be optimized for miniaturization or slimming.
- the reflectometer 210 may be configured to be rotated by a driving means for generating a magnetic force such as a magnet or a coil.
- a driving means for generating a magnetic force such as a magnet or a coil.
- the light of the subject reflected through the reflectometer module 200 is incident on the first lens 60 and the second lens 70 provided inside the actuator 100, and is applied to the actuator 100 of the present invention.
- each position of the first lens 60 and the second lens 70 with respect to the optical axis direction is adjusted in combination, thereby implementing functions such as zoom or AF.
- a fixed lens 50 may be provided in the front end direction of the actuator 100 as illustrated in FIG. 1 in order to improve optical performance such as zoom magnification of the actuator 100 according to the embodiment.
- an optical axis (Z axis) is defined as a direction axis corresponding to a path through which light enters the first lens 60, etc., and two axes on a plane perpendicular to the optical axis (Z axis) are defined as the X axis. and Y axis.
- FIG 2 is a view showing the overall configuration of the actuator 100 according to a preferred embodiment of the present invention.
- the actuator 100 of the present invention corresponds to the basic frame structure of the actuator 100 and accommodates the internal configuration of the housing 110, which is coupled to the housing 110 and can function as a shield can. It includes a case 190 with a first carrier 120 and a second carrier 130 .
- the first carrier 120 on which the first lens 60 is mounted and the second carrier 130 on which the second lens 70 is mounted correspond to a movable body that moves linearly in the optical axis direction (Z axis direction), respectively. From a corresponding relative point of view, the housing 110 corresponds to a stationary body.
- the second carrier 130 is positioned below the first carrier 120 with respect to the optical axis direction and linearly moves in the optical axis direction in this state.
- a first magnet M1 is provided on the first carrier 120, and a first coil portion that faces the first magnet M1 and provides a driving force to the first magnet M1 is provided on the housing 110 side. (C1) is provided.
- the first driving driver 150A When power of an appropriate magnitude and direction is applied to the first coil unit C1 by the first driving driver 150A, an electromagnetic force is generated between the first coil unit C1 and the first magnet M1, and the generated electromagnetic force Accordingly, the first carrier 120 moves forward and backward in the optical axis direction.
- the second driving driver 150B controls so that power of an appropriate size and direction is applied to the second coil unit C2
- the second magnet M2 and the second coil provided in the second carrier 130 are
- the second carrier 130 is linearly moved in the optical axis direction by the electromagnetic force generated between the portions C2.
- the drawing shows the first carrier 120 on which the first lens 60 is mounted and the second carrier 130 on which the second lens 70 is mounted, this is an example, and more Of course, the number of lenses and carriers may be provided.
- the number of carriers provided in the actuator 100 is exemplified as two for efficiency of explanation, and further, the carrier positioned at the upper part with respect to the optical axis direction of FIG. 2 is the first carrier 120 , and the carrier positioned at the lower part is referred to as a second carrier 130 .
- the fixed lens 50 may be provided in front of the first lens 60 according to the embodiment so as to conform to the optical performance or specifications of the actuator 100 .
- first carrier 120 and the housing 110 and between the second carrier 130 and the housing 110 so that the first carrier 120 and the second carrier 130 can move linearly more flexibly with minimized frictional force.
- 3 and 4 are diagrams illustrating detailed configurations of the first carrier 120 , the second carrier 130 , and the housing 110 according to an embodiment of the present invention.
- the first carrier 120 on which the first lens 60 of the present invention is mounted is a movable body that moves linearly in the optical axis direction, specifically, the first mounter 121 on which the first lens 60 is mounted. and a first support part 123 on which the first magnet M1 is mounted.
- the first mounter 121 is provided with a space corresponding to the shape of the first lens 60 so that the first lens (first lens assembly) 60 is mounted.
- a case (not shown) for preventing the lens 60 from being separated in the X-axis direction may be provided on the first mounter 121 .
- the first support part 123 on which the first magnet M1 is mounted is provided on one side of the left or right side of the first mounter 121, and as shown in the figure, the first mounter 121 is higher than the first mounter 121 in the optical axis direction as shown in the figure. It has an elongated shape.
- the first support part 123 may be formed integrally with the first mounter 121 and in the optical axis direction (Z-axis) to implement a physical structure symmetrical to the second support part 135 of the second carrier 130 to be described later. direction) is preferably configured to have a shape extending in any one direction.
- the first support part 123 of the present invention is configured to have a shape extending in the optical axis direction, the first magnet M1 having a size corresponding to the expanded area while maintaining the overall size of the first carrier 120 is Since it may be mounted, the driving force of the first carrier 120 may be further enhanced.
- the first coil unit C1 provided on the side of the housing 110 includes n coils arranged vertically in the optical axis direction to enhance the driving force. It is preferable to configure so that the magnetic pole facing the coil unit C1 becomes n+1.
- n is a natural number greater than or equal to 2.
- FIG 3 shows an embodiment of a first coil part C1 composed of two individual coils and a first magnet M1 in which three magnetic poles face the first coil part C1 as one embodiment. there is.
- the first magnet M1 when the first magnet M1 is implemented so that more magnetic poles than the number of individual coils face each other, even if the first magnet M1 moves according to the movement of the first carrier 120 in the optical axis direction, the first coil part ( Since C1) can face two or more magnetic poles of the first magnet M1, the magnetic force by the coil can be continuously transmitted to the first magnet M1, so that driving efficiency can be improved.
- the second coil unit C2 and the second magnet M2 for driving the second carrier 130 may also be applied in the same manner.
- the first Hall sensor 140A-1 and the second Hall sensor 140A-2 shown in FIG. 3 include the first circuit board 170-1 together with the first coil unit C1 and the first driving driver 150A. ), and corresponds to a configuration that detects the magnitude and direction of a magnetic field generated in the facing direction using the Hall effect and outputs a signal corresponding thereto.
- the first driving driver 150A calculates and processes the output signals input from the first Hall sensor 140A-1 and the second Hall sensor 140A-2, and the power of the magnitude and direction corresponding to the result is applied to the first core. Control to be applied to a part (C1). Details of the first Hall sensor 140A-1 and the second Hall sensor 140A-2 will be described later.
- the second carrier 130 has a physical structure corresponding to that of the first carrier 120 described above, but has a structure that is symmetrical to the first carrier 120 in opposite directions as shown in the drawings.
- the second carrier 130 includes a second mounter 131 on which the second lens 70 is mounted and a second support 133 on which the second magnet M2 is mounted.
- the second support part 133 of the second carrier 130 is provided on one side of either the left or the right side of the second mounter 131 , in the direction in which the first support part 123 of the first carrier 120 described above is provided. It is provided on one side opposite to the axial direction and has a shape that is longer than the second mounter 131 in the optical axis direction, and extends in a direction opposite to the direction in which the first support part 123 of the first carrier 120 extends. has the shape of
- the first carrier 120 and the second carrier 130 have a similar physical structure as a whole, but the first mounter 121 and the second mounter on which the first lens 60 is mounted in the middle part (based on the Y-axis) It is configured such that sufficient movement distances of the first and second lenses 60 and 70 are secured by positioning the second mounter 131 on which the lens 70 is mounted.
- the first magnet M1 for driving the first carrier 120 and the second magnet M2 for driving the second carrier 130 have a first support part 123 and a second support part 133 . Since it can be installed in a relatively larger size through the
- first magnet M1 and the second magnet M2 are spaced apart from each other on the left and right sides (based on the Y-axis), respectively, and the first coil portion C1 and the second magnet facing the first magnet M1 to correspond thereto
- the second coil portions C2 facing the two magnets M2 are also spaced apart from each other.
- the second magnet M2 and the second coil unit C2 are far apart from each other, mutual interference or influence of electromagnetic forces for driving each carrier can be fundamentally excluded, so that independent driving of the first carrier 120 and the second carrier 130 can be more precisely induced.
- the third Hall sensor 140B-1 and the fourth Hall sensor 140B-2 shown in FIG. 3 are a second circuit board 170-2 together with the second coil unit C2 and the second driving driver 150B. ), it corresponds to a configuration that detects the magnitude and direction of a magnetic field generated from the second magnet M2 in the facing direction by using the hall effect and outputs a signal corresponding thereto.
- the second driving driver 150B calculates and processes the output signals input from the third Hall sensor 140B-1 and the fourth Hall sensor 140B-2, and the power of the magnitude and direction corresponding to the result is applied to the second core. Control to be applied to a part (C2).
- FIG. 5 is a diagram illustrating a structure of a guide rail formed in the housing 110
- FIG. 6 is a diagram illustrating a structure of a rail formed in the first carrier 120 and the second carrier 130 .
- FIG. 5 is a cross-sectional view of the housing 110 cut along the YZ plane so that the first to fourth guide rails 111, 112, 113, and 114 formed on the bottom surface (based on the X-axis) of the housing 110 can protrude. corresponds to
- the first guide rail 111 and the second guide rail 112 are configured to guide the balls B1 and B2 positioned between the first carrier 120 and the housing 110, and the first guide rail ( 111) is formed on the outside in the right direction when referenced to the Y-axis of FIG. 5, and is formed in a plurality (preferably two) separated as shown in FIG.
- the first guide rail 111 is configured to face the first rail 125 (refer to FIG. 6 ) formed on the first support part 123 of the first carrier 120 in the optical axis direction as a whole to enable more stable support.
- the first ball B1 is preferably formed in a plurality of separated first guide rails 111 and between the first guide rails 111 and the first rails 125 of the first support parts 123. ) is placed.
- the first carrier 120 includes a second rail 127 formed on a portion of the first mounter 121 where the first support 123 is not provided, and the second rail ( 127 faces the second guide rail 112 formed in the housing 110 .
- the second guide rail 112 is formed on the inside in the left direction with respect to the Y axis of FIG. 5 , and is located between the second guide rail 112 and the second rail 127 .
- the second ball B2 is disposed.
- the binary first ball B1 disposed between the first rail 125 and the first guide rail 111 and the second ball B1 disposed between the second rail 127 and the second guide rail 112 ( Through the structure of B2), the first carrier 120 is treated with the housing 110 at three positions as a whole.
- the first carrier 120 as a whole while organically reflecting the physical structure of the first support 123 having a shape extending in the optical axis direction through the guiding structure of the first ball B1 and the second ball B2. Physical support can be made more stable.
- the second carrier 130 of the present invention includes a third rail 135 formed at a lower portion (based on the X axis) of the second support 133 on which the second magnet M2 is mounted, and the and a fourth rail 137 formed at a lower portion (based on the X-axis) of a portion of the second mounter 131 where the second support 133 is not provided.
- the third guide rail 113 is configured to face the third rail 135 formed on the second support part 133 , and extends in the optical axis direction as a whole to enable more stable support like the first guide rail 111 . It is preferable to have a shape, but to be formed in the housing 110 as a plurality of separated ones.
- the third guide rail 113 is formed further outward in the left direction than the second guide rail 112 on the Y axis of FIG. 5 , and is formed in the housing 110 .
- the fourth guide rail 114 faces the fourth rail 137 of the second carrier 130 and is formed inside the first guide rail 111 .
- the binary third ball B3 disposed between the third rail 135 and the third guide rail 113 and the fourth ball B3 disposed between the fourth rail 137 and the fourth guide rail 114 ( Through the structure of B4), the second carrier 120 as a whole faces the housing 110 at three positions.
- the overall shape of the second carrier 130 is Physical support can be made more stable.
- the part on which the lens is mounted and the part on which the driving magnet is mounted are dualized, and the part on which the magnet is mounted extends in the optical axis direction.
- shape, and the first carrier 120 and the second carrier 130 themselves are configured to have a symmetrical physical structure based on different directions.
- the structure for the guiding rail can be further extended in the optical axis direction, and based on this, the movement distance in the optical axis direction of the first carrier 120 and the second carrier 130 without interference or physical obstruction due to movement can be increased. can be expanded more effectively.
- Balls B1, B2, B3, B4 are part of rails 125, 127, 135, 137 or/and at least one of guide rails 111, 112, 113, 114 so that effective guiding for linearity is realized. It is preferable to be provided in a form that is accommodated.
- FIG. 7 is a diagram for explaining the positional relationship between a plurality of Hall sensors and a magnet according to the present invention
- FIG. 8 is a diagram illustrating output signals of the plurality of Hall sensors and their calculated signal systems.
- first magnet M1 and the first Hall sensor 140A-1 and the second Hall sensor 140A-2 for detecting the position of the first magnet M1 will be described as the basis, but for these Of course, the description can be applied as it is to the second magnet M2 and the third Hall sensor 140B-1 and the fourth Hall sensor 140B-2 that detect the positions of the second magnet M2.
- the Hall sensor detects the magnitude and direction of a magnetic field of a magnet disposed at a facing position using the Hall effect, and outputs a corresponding electrical signal.
- the Hall sensor when the Hall sensor is located in the middle of a specific magnetic pole (N or S pole) of the magnet, the change in the signal value output by the Hall sensor according to the movement of the magnet is small, and the Hall sensor is located at the boundary of the magnetic pole. In this case, the change in the value of the output signal of the hall sensor according to the movement of the magnet becomes large.
- the movement range of the carrier is extended as in the case of high magnification zoom
- the movement range of the magnet installed in the carrier is also extended. and dynamically face each other.
- the exact position of the magnet can be detected because the difference in signal value is clear in a certain range. it may not be As described above, if accurate position detection of the magnet is not performed, position control for zoom or AF driving cannot be precisely implemented.
- the present invention includes a Hall sensor for detecting the position of the first magnet M1 as shown in FIG. 7 , but the magnetic pole boundary of the first magnet M1 with respect to the optical axis direction It includes a plurality of Hall sensors provided at positions having different distances from each other (A1 and A2 in FIG. 7 ).
- the first driving driver 150A of the present invention generates the position information of the first magnet M1 by using the output signals output from the plurality of Hall sensors together, and drives the first carrier 120 based on this. is configured to control
- the drawing shows two Hall sensors, a first Hall sensor 140A-1 and a second Hall sensor 140A-2, as a plurality of Hall sensors, this is an example and a larger number of Hall sensors are provided according to the embodiment. Of course it could be.
- the second Hall sensor 140A-2 is disposed at a position S1 close to the magnetic pole boundary A1 as shown in the center plan view of FIG. 7, and the first Hall sensor 140A-1 is the same magnetic pole boundary A1. It is configured to be disposed at a position S2 farther than the second hall sensor 140A-2 with respect to .
- the first Hall sensor 140A-1 and the second Hall sensor (140A-1) and the second Hall sensor (140A-1) so that processing using the output signal values of the first Hall sensor (140A-1) and the second Hall sensor (140A-2) together can be implemented more precisely 140A-2) is arranged vertically with respect to the optical axis direction, and is preferably arranged on the same line parallel to the optical axis direction.
- the state shown in FIG. 7 is a state according to the initial position of zoom or AF driving, and when zoom or AF is driven by the first driving driver 150A, the first magnet M1 is +Z
- the output signal of the first Hall sensor 140A-1 and the output signal of the second Hall sensor 140A-2 according to the movement of the first magnet M1 are shown in Fig. 8(a), respectively. ) and FIG. 8(b).
- the first Hall sensor 140A-1 faces the middle portion of the magnetic pole (N pole) of the first magnet M1, so that in the T1 section, the first Hall sensor Although the signal change value of 140A-1 is small, since the second Hall sensor 140A-2 is disposed in a position close to the magnetic pole boundary A1 of the first magnet M1, in the T1 section, the second Hall sensor ( The signal change value of 140A-2) becomes large.
- the first Hall sensor 140A-1 is relatively close to the magnetic pole boundary A1
- the second Hall sensor 140A-2 moves away from the magnetic pole boundary (A1) and faces the center of the other adjacent magnetic pole (S pole). Accordingly, in the T2 section, the signal change value of the first Hall sensor 140A-1 is relatively clear, while the signal change value of the second Hall sensor 140A-2 is slowed down.
- the output signal value of the second Hall sensor 140A-2 is used, and in the T2 section, the position of the first magnet M1 is determined using the output signal value of the first Hall sensor 140A-1.
- the position of the first magnet M1 is determined using the output signal value of the first Hall sensor 140A-1.
- an electric circuit is configured to calculate the output signal values of the first Hall sensor 140A-1 and the second Hall sensor 140A-2 (addition operation or subtraction operation, etc.) or a driving algorithm , it is possible to omit an additional process such as physically or electrically distinguishing each section, thereby improving the efficiency of data processing processing.
- the first Hall sensor 140A-1 is spaced apart from the first magnetic pole boundary A1 by an amount corresponding to S1
- the second Hall sensor 140A-2 is the first It corresponds to the embodiment spaced apart by the stimulus boundary (A2) and S2 (S2>S1).
- the output signal output by the Hall sensor differs only in sign value (positive or negative), and the magnitude is the same as in the embodiment described above. Since it corresponds to the technical idea of the present invention described above can be implemented.
- the embodiment of the present invention is shown in FIG. It should be construed as not limited to the examples.
- the first magnet M1 is configured to have m magnetic poles facing the first coil unit C1, and the plurality of Hall sensors, that is, the first Hall sensor 140A-1 and the second Hall sensor Reference numeral 140A-2 may be configured such that, when the first carrier 120 is positioned at the default position, it is disposed at a position facing the same pole among the m poles.
- m is a natural number greater than or equal to 3.
- the first coil portion C1 facing the first magnet M1 is divided into a first sub-coil C1-1 and a second sub-coil C1-2 as shown in FIG. 7 . can be configured.
- the size of the first magnet M1 can be extended to correspond to the extended movement distance of the first carrier 120, and different first sub-coils C1-1 facing different magnetic poles and A driving force may be provided using the mutual relationship between the second sub-coils C1 - 2 , and thus driving efficiency may be further increased.
- the first Hall sensor 140A-1 and the second Hall sensor 140A-2 face the same magnetic pole among the poles of the first magnet M1.
- the process of setting the initial position of the first carrier 120 can be omitted, so that the position detection and It is possible to further increase the efficiency of the used feedback position control.
- FIG. 9 is a block diagram illustrating a detailed configuration of the position control device 300 according to an embodiment of the present invention
- FIG. 10 is a position control method for zoom driving performed in the position control device 300 of the present invention. It is a flowchart showing the process for
- the position control device 300 of the present invention described below is to the actuator.
- it may be implemented with the first driving driver 150A or the second driving driver 150B described above according to the embodiment.
- Each component of the position control device 300 of the present invention shown in FIG. 9 should be understood as a logically divided component rather than a physically divided component.
- each configuration corresponds to a logical component for realizing the technical idea of the present invention, even if each component is integrated or configured separately, if the function performed by the logical configuration of the present invention can be realized, the present invention It should be construed as being within the scope, and if it is a component that performs the same or similar function, it should be construed as being within the scope of the present invention regardless of whether the name is consistent.
- the position control device 300 of the present invention may include an input unit 310 , a signal generation unit 320 , a DB unit 330 , and a driving control unit 340 .
- the input unit 310 is connected to an interface that receives signals from a plurality of Hall sensors, that is, the first Hall sensor 140A-1 and the second Hall sensor 140A-2 in an embodiment (S910). corresponding configuration.
- the input unit 310 of the present invention receives a signal from a plurality of Hall sensors 140A-1, -2 ... disposed at a position facing the first magnet M1. It may be configured to receive an input (S910), and in this case, the position control device 300 of the present invention is configured to generate a position signal of the first carrier 120 using a plurality of signals of all or a selected combination of the plurality of signals. it might be
- the first magnet M1, the first coil unit C1, the first hall sensor 140A-1 for detecting the positions of the first magnet M1 related to the position control of the first carrier 120, and the first hole The following content, which will be described based on the sensor 140A-1, detects the positions of the second magnet M2, the second coil unit C2, and the second magnet M2 related to the position control of the second carrier 130. Of course, it can be applied to the third Hall sensor 140B-1 and the fourth Hall sensor 140B-2.
- the signal generator 320 of the present invention When the output signal (first signal) output by the first Hall sensor 140A-1 and the output signal (second signal) output by the second Hall sensor 140A-2 are input through the interfacing of the input unit 310 , (S910)
- the signal generator 320 of the present invention generates a position signal that is a signal for the current position of the first carrier 120 by calculating the first and second signals (S950).
- the plurality of Hall sensors (the first Hall sensor 140A-1, the second Hall sensor 140A-2) are connected to the first magnet ( When the same stimulus of M1) is faced together, the position signal is generated using the processing (S930) based on the addition operation of the output signals (the first signal and the second signal) of each Hall sensor (S950).
- the position signal is generated using processing (S940) based on a subtraction operation of the output signals (first signal and second signal) of each Hall sensor (S950).
- DB information such as a lookup table in which the electric signal value (code value) output from the Hall sensor and the control value information on the magnitude and direction of the power delivered to the first coil unit (C1-1, C1-2) is interconnected may be stored (S900).
- the processing for calculating the first signal and the second signal may be implemented by a hardware configuration such as a circuit that electrically connects the first Hall sensor 140A-1 and the second Hall sensor 140A-2, according to the embodiment Accordingly, of course, it may be implemented by a circuit design in the first driving driver 150A or software mounted in the first driving driver 150A.
- the driving control unit 340 of the present invention reads information stored in the DB unit 330 and selects control value information corresponding to the position signal ( S960).
- the driving control unit 340 of the present invention controls so that power of the magnitude and direction corresponding to the control value information is applied to the first coil units C1, C1-1, C1-2.
- the position or movement of the first carrier 120 is controlled (S970).
- modifiers such as 1st and 2nd are merely instrumental terms used to relatively distinguish components from each other, so they are used to indicate a specific order, priority, etc. It should not be construed as a term that is
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Abstract
Description
Claims (11)
- 제1렌즈가 탑재되며 광축 방향으로 이동하는 제1캐리어;제2렌즈가 탑재되며 광축 방향을 기준으로 상기 제1캐리어의 상부 또는 하부에서 광축 방향으로 이동하는 제2캐리어;상기 제1캐리어 및 제2캐리어를 수용하는 하우징;상기 제1캐리어에 장착되는 제1마그네트;상기 제2캐리어에 장착되는 제2마그네트;상기 하우징에 구비되며 상기 제1마그네트와 대면하는 제1코일부;상기 하우징에 구비되며 상기 제2마그네트와 대면하는 제2코일부; 및상기 하우징과 상기 제1캐리어 사이 그리고 상기 하우징과 상기 제2캐리어 사이에 각각 배치되는 볼을 포함하는 것을 특징으로 하는 줌 구동 액추에이터.
- 제1항에 있어서, 상기 제1캐리어는,상기 제1렌즈가 탑재되는 제1마운터; 및상기 제1마운터의 좌측 또는 우측 중 하나에 구비되며, 광축 방향을 기준으로 상기 제1마운터보다 연장된 형상을 가지는 제1지지부를 포함하는 것을 특징으로 하는 줌 구동 액추에이터.
- 제 2항에 있어서, 상기 제2캐리어는,상기 제2렌즈가 탑재되는 제2마운터; 및상기 제2마운터의 좌측 또는 우측 중 상기 제1지지부가 구비된 반대측에 구비되며, 광축 방향을 기준으로 상기 제2마운터보다 연장된 형상을 가지되, 상기 제1지지부의 연장 방향과 반대 방향으로 연장된 형상을 가지는 제2지지부를 포함하는 것을 특징으로 하는 줌 구동 액추에이터.
- 제1항에 있어서, 상기 제1코일부 또는 제2코일부는,광축 방향을 기준으로 상하로 배열되는 n(n은 2이상의 자연수)개의 코일로 이루어지며,상기 제1마그네트 또는 제2마그네트는,상기 제1코일부 또는 제2코일부와 대면하는 자극이 n+1개의 자극으로 이루어지는 것을 특징으로 하는 줌 구동 액추에이터.
- 제3항에 있어서, 상기 제1캐리어는,상기 제1지지부에 형성되는 제1레일; 및상기 제1마운터 중 제1지지부가 구비되지 않은 부분에 형성되는 제2레일을 더 포함하고,상기 제2캐리어는,상기 제2지지부에 형성되는 제3레일; 및상기 제2마운터 중 제2지지부가 구비되지 않은 부분에 형성되는 제4레일을 더 포함하고,상기 하우징은,상기 제1 및 제3레일 각각과 대면하며 분리된 복수 개로 형성되는 제1및 제3가이드레일; 및상기 제2 및 제4레일 각각과 대면하는 제2 및 제4가이드레일을 포함하고,상기 볼은, 상기 제1레일 내지 제4레일과 상기 제1내지 제4가이드레일 사이 각각에 배치되는 것을 특징으로 하는 줌 구동 액추에이터.
- 제5항에 있어서, 상기 제1 내지 제4가이드레일은,상기 광축 방향으로 나란히 배치되며,상기 제1가이드레일은 상기 하우징의 좌측 또는 우측 중 어느 일측에 형성되며, 상기 제3가이드레일은 상기 하우징의 좌측 또는 우측 중 상기 제1가이드레일이 형성되지 않은 타측에 형성되고,상기 제2가이드레일은 제3가이드레일의 내측에 형성되며, 제4가이드레일은 제1가이드레일 내측에 형성되는 것을 특징으로 하는 줌 구동 액추에이터.
- 제1항에 있어서,광축 방향을 기준으로 상기 제1마그네트의 자극 경계로부터 이격된 거리가 서로 다른 위치에 구비되는 복수 개 홀센서를 더 포함하는 것을 특징으로 하는 줌 구동 액추에이터.
- 제7항에 있어서, 상기 복수 개 홀센서는,광축 방향을 기준으로 상하로 배치되되, 광축 방향과 나란한 동일선상에 배치되는 것을 특징으로 하는 줌 구동 액추에이터.
- 제7항에 있어서, 상기 제1마그네트는,상기 제1코일부와 대면하는 자극이 m(m은 3이상의 자연수)개이며,상기 복수 개 홀센서는,상기 제1캐리어가 초기 포지션에 위치하는 경우, 상기 m개의 자극 중 동일한 자극에 함께 대면하는 위치에 배치되는 것을 특징으로 하는 줌 구동 액추에이터.
- 제1렌즈 및 제1마그네트가 탑재되며 광축 방향으로 이동하는 제1캐리어, 제2렌즈 및 제2마그네트가 탑재되며 광축 방향을 기준으로 상기 제1캐리어의 상부 또는 하부에서 광축 방향으로 이동하는 제2캐리어, 상기 제1마그네트와 대면하는 제1코일부, 상기 제2마그네트와 대면하는 제2코일부와, 상기 제1마그네트와 대면하는 복수 개 홀센서를 포함하는 줌 구동 액추에이터의 위치제어방법으로서,상기 복수 개 홀센서 각각으로부터 출력신호를 입력받는 신호입력단계;상기 출력신호를 연산하여 상기 제1캐리어의 위치신호를 생성하는 위치신호생성단계; 및상기 위치신호를 이용하여 상기 제1캐리어의 위치를 제어하는 위치제어단계를 포함하고,상기 복수 개 홀센서는 광축 방향을 기준으로 상기 제1마그네트의 자극 경계로부터 이격된 거리가 서로 다른 위치에 구비되는 것을 특징으로 하는 줌 구동을 위한 위치제어방법.
- 제10항에 있어서, 상기 제1마그네트는,상기 제1코일부와 대면하는 자극이 m(m은 3이상의 자연수)개이며,상기 위치신호생성단계는,상기 제1캐리어의 초기 포지션 위치 시, 상기 복수 개 홀센서가 상기 제1마그네트의 동일한 자극에 함께 대면하는 경우 상기 출력신호를 덧셈 연산하고, 상기 복수 개 홀센서가 상기 제1마그네트의 서로 다른 자극에 각각 대면하는 경우 상기 출력신호를 뺄셈 연산하는 것을 특징으로 하는 줌 구동을 위한 위치제어방법.
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| US18/041,739 US12242168B2 (en) | 2020-09-28 | 2021-09-09 | Zoom driving actuator and position control method for zoom driving |
| CN202180066118.2A CN116324613A (zh) | 2020-09-28 | 2021-09-09 | 变焦驱动致动器和用于变焦驱动的位置控制方法 |
| EP21872790.7A EP4220296B1 (en) | 2020-09-28 | 2021-09-09 | Zoom driving actuator and position control method for zoom driving |
| US18/915,354 US12596292B2 (en) | 2020-09-28 | 2024-10-15 | Zoom driving actuator and position control method for zoom driving |
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| KR10-2020-0125428 | 2020-09-28 |
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| US18/915,354 Continuation US12596292B2 (en) | 2020-09-28 | 2024-10-15 | Zoom driving actuator and position control method for zoom driving |
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| WO2022065760A1 true WO2022065760A1 (ko) | 2022-03-31 |
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| US20220100058A1 (en) * | 2020-09-29 | 2022-03-31 | Samsung Electro-Mechanics Co., Ltd. | Camera module |
| US12556789B2 (en) * | 2021-04-15 | 2026-02-17 | Lg Innotek Co., Ltd. | Camera actuator, and camera device and optical device comprising same |
| KR102871827B1 (ko) * | 2022-04-19 | 2025-10-23 | 자화전자(주) | 줌 구동용 액추에이터 |
| KR102762883B1 (ko) | 2022-05-03 | 2025-02-07 | 삼성전기주식회사 | 연속 줌 카메라 장치 |
| KR20240141963A (ko) * | 2023-03-21 | 2024-09-30 | 엘지이노텍 주식회사 | 카메라 엑추에이터 및 이를 포함하는 카메라 모듈 |
| WO2026084185A1 (ko) * | 2024-10-16 | 2026-04-23 | 자화전자(주) | 카메라 액추에이터 |
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| CN105511047B (zh) * | 2015-12-29 | 2019-09-20 | 上海比路电子股份有限公司 | 一种光学变焦马达 |
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| EP4220296A1 (en) | 2023-08-02 |
| EP4220296B1 (en) | 2026-05-06 |
| EP4220296A4 (en) | 2024-05-22 |
| US12242168B2 (en) | 2025-03-04 |
| US12596292B2 (en) | 2026-04-07 |
| KR20220042528A (ko) | 2022-04-05 |
| KR102696885B1 (ko) | 2024-08-20 |
| CN116324613A (zh) | 2023-06-23 |
| KR20240125534A (ko) | 2024-08-19 |
| US20250036009A1 (en) | 2025-01-30 |
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