WO2014034360A1 - レンズ駆動装置、およびカメラモジュール - Google Patents
レンズ駆動装置、およびカメラモジュール Download PDFInfo
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- WO2014034360A1 WO2014034360A1 PCT/JP2013/070639 JP2013070639W WO2014034360A1 WO 2014034360 A1 WO2014034360 A1 WO 2014034360A1 JP 2013070639 W JP2013070639 W JP 2013070639W WO 2014034360 A1 WO2014034360 A1 WO 2014034360A1
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- Prior art keywords
- lens
- base
- holder
- driving device
- lens holder
- Prior art date
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- 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
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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- 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
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
-
- 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
-
- 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
-
- 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
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/035—DC motors; Unipolar motors
- H02K41/0352—Unipolar motors
- H02K41/0354—Lorentz force motors, e.g. voice coil motors
- H02K41/0356—Lorentz force motors, e.g. voice coil motors moving along a straight path
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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
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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
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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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
- 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
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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
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
Definitions
- the present invention relates to a lens driving device capable of realizing an autofocus function, and a camera module including the lens driving device and having an autofocus function.
- the initial focus position adjustment at infinity (that is, the search for the focus position at infinity) is performed mainly in the following manner.
- an image sensor, an image sensor cover, a lens driving device, and the like are mounted on a substrate.
- the lens barrel holding the imaging lens is incorporated into the lens holder from the upper surface of the lens driving device.
- the lens barrel height is adjusted, for example, in the following manner.
- Threads that engage each other are provided on each of the outer wall side surface of the lens barrel and the inner wall side surface of the lens holder. Then, the lens barrel is assembled into the lens holder by screwing the thread of the lens barrel into the thread of the lens holder. At the time of this incorporation, the height of the lens barrel (and hence the imaging lens) relative to the imaging device can be adjusted according to the screwing amount of the thread of the lens barrel.
- the bottom part of the leg of the lens barrel is a base (including one formed integrally with the sensor cover) constituting the upper surface of the sensor cover or the bottom part of the lens driving device. It abuts on the upper surface.
- the imaging lens is held on the inner wall of the lens holder without using a lens barrel in order to achieve a reduction in size.
- VCM voice coil motor
- initial focus position adjustment at infinity is performed in the following manner.
- an image sensor is mounted on a substrate by die bonding and wire bonding, a lower cylinder is attached thereto, and then a lens driving device is assembled on the upper surface of the lower cylinder.
- an imaging lens formed by fitting a plurality of lenses is placed on an IR (infrared) cut filter, and inspection light is condensed on the light receiving surface of the image sensor by the imaging lens.
- the output signal of the image sensor is measured, and the interval between the image sensor and the imaging lens is adjusted so that the focal position is appropriate based on the measurement result.
- the initial focus position adjustment at infinity is performed.
- the imaging lens is fitted into the lens holder and fixed with an adhesive.
- Japanese Patent Publication Japanese Patent Laid-Open No. 2010-134409 (published on June 17, 2010)” Japanese Patent Publication “JP 2007-121849 A (published May 17, 2007)”
- the performance of the camera module depends not only on the performance of the parts (imaging lens, imaging device, etc.) but also on the dimensional variation of the parts and the accuracy of assembly. For this reason, high accuracy is required for the assembly process of the camera module.
- assembly accuracy it is preferable that the positional deviation between the optical axis of the imaging lens and the center of the light receiving surface of the imaging device is small, and that the optical axis of the imaging lens is parallel to the normal of the imaging device. preferable.
- the “positional deviation” means a positional deviation in a direction perpendicular to the optical axis of the imaging lens accommodated in the lens holder.
- the “center” means a portion constituting the center in the direction perpendicular to the optical axis of the imaging lens accommodated in the lens holder.
- the “center” is a line.
- the “center” is an axis (axial center).
- the position corresponding to the “center” may be a space.
- the “normal line of the image sensor” corresponds to the normal line when the light receiving surface of the image sensor is a geometric surface, and preferably passes through the center of the light receiving surface.
- the “angle deviation between the optical axis of the imaging lens and the normal of the imaging device” means that the angle formed by the optical axis of the imaging lens and the light receiving surface of the imaging device is not desired (ie, 90 °). This is equal to the tilt shift in the imaging lens.
- the positional deviation between the optical axis of the imaging lens and the center of the light receiving surface of the imaging element is the amount of positional deviation between the center of the light receiving surface of the imaging element and the center of the sensor cover, the center of the sensor cover, and the base of the lens driving device.
- the total amount of positional deviation from the center of the lens, the amount of positional deviation between the center of the base and the center of the lens holder, and the amount of positional deviation between the center of the lens holder and the center of the imaging lens is the amount of positional deviation between the center of the light receiving surface of the imaging element and the center of the sensor cover, the center of the sensor cover, and the base of the lens driving device.
- angle deviation (tilt) between the optical axis of the imaging lens and the normal of the imaging element is that when the imaging element, the substrate, the sensor cover, the base, the lens holder, and the imaging lens are assembled. It can be interpreted as a slope of.
- the camera module disclosed in Patent Document 1 does not have a structure for determining the positional relationship between the center of the base and the center of the lens holder. For this reason, if the dimensions and / or assembly accuracy of the members related to the base and the lens holder are not sufficient, the positional deviation between the optical axis of the imaging lens and the center of the light receiving surface of the imaging device increases, and the performance of the camera module May not be fully demonstrated.
- the imaging apparatus disclosed in Patent Document 2 can keep the distance between the image sensor and the imaging lens constant, it determines the positional relationship between the optical axis of the imaging lens and the center of the light receiving surface of the imaging element. It is thought that it does not have the structure of. For this reason, if the dimensions and / or assembly accuracy of all the members are not sufficient, the amount of positional deviation between the optical axis of the imaging lens and the center of the light receiving surface of the imaging device increases, and the performance of the camera module can be sufficiently exerted. There is a risk of disappearing.
- the angle deviation between the optical axis of the imaging lens and the normal of the imaging element depends on the assembly accuracy. For this reason, unless a high-accuracy assembly apparatus is used, there is a possibility that the amount of angular deviation becomes large (the imaging lens is tilted), and the performance of the camera module cannot be fully exhibited.
- the imaging device disclosed in Patent Document 2 needs to adjust the initial focus position at infinity as described above. This adjustment is complicated. Therefore, in manufacturing the imaging device disclosed in Patent Document 2, it is necessary to use a highly accurate assembly device, which causes a problem that the manufacturing cost increases.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a lens driving device capable of determining the position of the imaging lens with respect to the imaging element with higher accuracy at a low cost, and this It is an object of the present invention to provide a camera module having a lens driving device.
- a first lens driving device of the present invention includes a lens holder that houses an imaging lens therein, and a base that constitutes a bottom portion and supports the lens holder.
- the lens holder is provided with a holder taper surface having a tapered shape whose diameter decreases from the upper surface side to the bottom surface side of the base, and the base engages with the holder taper surface.
- a holder taper engagement surface is provided, and when the lens holder is supported by the base, the holder taper surface engages with the holder taper engagement surface.
- a second lens driving device of the present invention includes a lens holder that houses an imaging lens therein, and a base that forms a bottom and supports the lens holder.
- the base is an annular member
- the lens holder includes a first protrusion formed on a bottom portion of the lens holder and a second protrusion formed on an outer wall of a side surface of the lens holder.
- a lens driving device that can determine the position of an imaging lens with respect to an imaging element with higher accuracy at a low cost, and a camera module including the lens driving device. Can do.
- FIG. 1 is a cross-sectional view showing the configuration of the lens driving device according to the first embodiment.
- the lens driving device 101 shown in FIG. 1 includes a lens holder 1, a driving unit 2, a base 3, and an upper cover 4.
- the lens driving device 101 shown in FIG. 1 includes a lens holder 1, a driving unit 2, a base 3, and an upper cover 4.
- the upper cover 4 side is expressed as “upper (ie, upper, upper, etc.)” and the base 3 side is expressed as “lower (ie, lower, lower, etc.)”.
- the lens holder 1 is a cylindrical member and is configured to accommodate the imaging lens 50 therein.
- the axis of the lens holder 1 (the center of the lens holder) coincides with the optical axis La of the imaging lens 50.
- the diameter of the opening 11 a on the top surface (top surface) of the lens holder 1 is smaller than that of the opening 11 b on the bottom surface of the lens holder 1. The reason for this is to make it easier to hold the imaging lens 50 on the inner wall of the upper surface of the lens holder 1 and to limit the diameter of light incident on the imaging lens 50 (that is, to function as an aperture stop).
- the imaging lens 50 shown in FIG. 1 is a lens unit composed of a plurality of lenses.
- the imaging lens 50 may be composed of a single lens.
- the driving unit 2 displaces the lens holder 1 in the direction of the optical axis La of the imaging lens 50 housed in the lens holder 1.
- the drive unit 2 includes a drive coil 21, a permanent magnet 22, an upper leaf spring 23 a and a lower leaf spring 23 b, and a yoke 24.
- the drive coil 21 is attached to the outer wall on the side surface of the lens holder 1.
- the permanent magnet 22 is provided so as to face the drive coil 21 and constitutes a magnetic circuit.
- the upper leaf spring 23 a has one end attached to the outer wall of the upper surface of the lens holder 1 and the other end attached to the upper surface of the yoke 24.
- One end of the lower leaf spring 23 b is attached to the outer wall of the side surface of the lens holder 1, and the other end is attached to the upper surface of the base 3.
- the yoke 24 is a cylindrical member and constitutes the side surface of the drive unit 2.
- the yoke 24 is fixed on the base 3.
- the drive coil 21 and the permanent magnet 22 generate electromagnetic force.
- the upper plate spring 23a and the lower plate spring 23b displace the lens holder 1 in the direction of the optical axis La of the imaging lens 50 according to this electromagnetic force. In this way, the lens holder 1 can be displaced in the drive unit 2.
- the base 3 constitutes the bottom of the lens driving device 101.
- the lens holder 1, the drive unit 2, and the upper cover 4 are provided on the base 3.
- the base 3 is configured to support the lens holder 1. Details of the support of the lens holder 1 by the base 3 will be described later.
- the upper cover 4 is provided on the upper surface of the yoke 24 and constitutes the upper surface of the lens driving device 101.
- the upper cover 4 is provided with an opening 41 in order to ensure an optical path of light incident on the imaging lens 50.
- the yoke 24 may have the function of the upper cover 4 and the upper cover 4 may be omitted (in this case, the opening 41 is provided in the yoke 24).
- the lens driving device 101 is a VCM type lens driving device.
- the lens holder 1 is provided with a holder taper surface 12.
- the holder taper surface 12 has a tapered shape whose diameter decreases from the upper surface side to the bottom surface side of the base 3.
- the base 3 is provided with a holder taper engagement surface 31 that engages with the holder taper surface 12.
- the holder taper engagement surface 31 has a shape opposite to (symmetrical to) the taper shape provided as the holder taper surface 12, and can be said to be a surface adjacent to the tapered space.
- the lens holder 1 is supported by the base 3. At this time, the holder taper surface 12 and the holder taper engagement surface 31 come into contact with each other, whereby the holder taper surface 12 and the holder taper engagement surface 31. And engage.
- the lens holder 1 can be fixed to the base 3. Further, when fixed, the positional relationship between the center of the base 3 and the center of the lens holder 1 is uniquely determined, and the inclination of the lens holder 1 with respect to the base 3 is also uniquely determined.
- the lens driving device 101 when the lens driving device 101 is combined with an image sensor (details will be described later) or the like to form a camera module, the amount of positional deviation between the optical axis La of the image pickup lens 50 and the center of the light receiving surface of the image sensor. Can be reduced. In this case, it is also possible to reduce the amount of angular deviation between the optical axis La of the imaging lens 50 and the normal line of the imaging element. Therefore, the position of the imaging lens 50 with respect to the imaging device can be determined with higher accuracy.
- the lens holder 1 and the base 3 are brought into contact with and engaged with each other via a tapered portion having a symmetrical shape.
- the base 3 is an annular member.
- the lens holder 1 is provided with a first protrusion 13 at the bottom of the lens holder 1 and a second protrusion 14 on the outer wall of the side surface of the lens holder 1.
- the lens holder 1 is supported by the base 3. At this time, the first projecting portion 13 penetrates the space defined by the base 3, and the second projecting portion 14 captures the image. It abuts on the upper surface of the base 3 so as to suppress the tilt of the lens 50.
- the first protrusion 13 passes through a hollow portion in the base 3 as a space defined by the base 3. Further, the second protrusion 14 adjusts the inclination of the lens holder 1 according to the inclination angle of the surface in contact with the upper surface of the base 3, thereby realizing the suppression of the inclination of the imaging lens 50. .
- the camera module when configured by combining the lens driving device 101 with an imaging device or the like, it is possible to reduce the amount of angular deviation between the optical axis La of the imaging lens 50 and the normal line of the imaging device.
- the first projecting portion 13 can be surely brought into contact with a sensor cover (details will be described later) that cover the imaging device, and with this contact, the imaging lens for the imaging device.
- the determination of 50 positions can be performed more reliably. Therefore, the position of the imaging lens 50 with respect to the imaging device can be determined with higher accuracy.
- the lens driving device 101 can determine the position of the imaging lens 50 with respect to the imaging element with sufficiently high accuracy without adjusting the initial focus position at infinity. Therefore, it is not necessary to use a high-precision assembly device, and a reduction in the manufacturing cost of the camera module can be expected.
- the lens driving device 101 has all of the holder taper surface 12 and the holder taper engagement surface 31, the first projecting portion 13, and the second projecting portion 14, but has all of them. That is not essential. That is, the lens driving device according to the present invention may be configured to include at least the holder taper surface 12 and the holder taper engagement surface 31, or may include at least the first protrusion 13 and the second protrusion 14. It may be.
- FIG. 1 shows a configuration in which the imaging lens 50 is accommodated in the lens holder 1 of the lens driving device 101.
- the lens driving device 101 is merely included in the lens holder 1 as an imaging lens. 50 can be accommodated.
- the imaging lens 50 is not included in the components of the lens driving device 101. The same applies to lens driving devices 102 to 104 described later.
- the lens driving device 101 has a convex portion 32 on the bottom surface of the base 3.
- FIG. 2 is a cross-sectional view illustrating a configuration of a lens driving device according to the second embodiment.
- the lens driving device 102 shown in FIG. 2 is different from the lens driving device 101 shown in FIG. 1 in that the convex portion 32 is not provided and the concave portion 33 is provided.
- the concave portion 33 is provided on the bottom surface of the base 3 in the same manner as the convex portion 32.
- the lens driving device 102 can obtain the same effects as the lens driving device 101.
- FIG. 3 is a cross-sectional view illustrating a configuration of a lens driving device according to the third embodiment.
- the lens driving device 101 shown in FIG. 1 and the lens driving device 102 shown in FIG. 2 did not include a lens barrel. That is, both the lens driving device 101 and the lens driving device 102 have a structure in which the imaging lens 50 is held on the inner wall of the lens holder 1 without using a lens barrel.
- the lens barrel 6 is a cylindrical member and is accommodated in the lens holder 7 and the imaging lens 50 is accommodated therein.
- the lens holder 7 is a cylindrical member, and accommodates and holds the lens barrel 6 in which the imaging lens 50 is accommodated.
- the lens holder 7 is the same as the lens holder 1 in that the holder taper surface 12, the first protrusion 13, and the second protrusion 14 are provided.
- the combined shape of the lens barrel 6 and the lens holder 7 is substantially the same as the shape of the lens holder 1, but the present invention is not limited to this.
- the configuration in which the lens barrel 6 in which the imaging lens 50 is accommodated is accommodated in the lens holder 7 is also an example of a configuration in which “the imaging lens is accommodated in the lens holder”.
- the top opening 71a of the lens holder 7 has substantially the same diameter as the bottom opening 71b of the lens holder 7.
- the lens barrel 6 is inserted into a hollow portion of a cylindrical lens holder 7.
- the upper opening 61 a of the lens barrel 6 is smaller in diameter than the bottom opening 61 b of the lens barrel 6. The reason for this is to make it easier to hold the imaging lens 50 on the inner wall of the upper surface of the lens barrel 6 and to limit the diameter of light incident on the imaging lens 50 (that is, to function as an aperture stop).
- the lens driving device 103 shown in FIG. 3 is provided with a convex portion 32 on the bottom surface of the base 3 in the same manner as the lens driving device 101, and the outer shape of the convex portion 32 is tapered. This is different from the lens driving device 101.
- the lens driving device 103 can obtain the same effects as those of the lens driving device 101.
- FIG. 4 is a cross-sectional view illustrating a configuration of a lens driving device according to the fourth embodiment.
- the imaging lens 51 shown in FIG. 4 has a substantially truncated cone shape. In other words, the imaging lens 51 shown in FIGS. Is different.
- the optical axis of the imaging lens 51 is shown as an optical axis Lb.
- the axis of the lens holder 1 (the center of the lens holder) coincides with the optical axis Lb of the imaging lens 51.
- the lens driving device 104 shown in FIG. 4 is different from the lens driving device 101 shown in FIG. 1 in that a lens engaging surface 15 that engages with the outer shape of the imaging lens 51 is provided on the inner wall of the lens holder 1. Yes.
- the lens engaging surface 15 has a shape opposite to (symmetrical to) the tapered shape provided as the outer wall of the imaging lens 51, and can be said to be a surface adjacent to the tapered space.
- the imaging lens 51 is held by the lens holder 1. At this time, the outer wall of the imaging lens 51 and the lens engagement surface 15 come into contact with each other. The lens engaging surface 15 is engaged.
- the imaging lens 51 can be fixed to the lens holder 1. Further, when fixed, the positional relationship between the center of the lens holder 1 and the center of the imaging lens 51 is determined uniquely, and the inclination of the imaging lens 51 with respect to the lens holder 1 is also determined uniquely.
- the lens driving device 104 is combined with an image pickup device (details will be described later) and the like to form a camera module
- the positional deviation between the optical axis Lb of the image pickup lens 51 and the center of the light receiving surface of the image pickup device. Can be reduced.
- the amount of angular deviation between the optical axis Lb of the imaging lens 51 and the normal line of the imaging element can be reduced. Accordingly, it is possible to determine the position of the imaging lens 51 with respect to the imaging element with higher accuracy.
- the lens driving device 104 shown in FIG. 4 is configured not to include a lens barrel, but may include a lens barrel. That is, the characteristic configuration of the lens driving device 104 can be applied to a lens driving device having a lens barrel.
- the outer configuration of the imaging lens 51 can be further applied to the outer configuration of the lens barrel 6.
- the outer shape of the lens barrel 6 is tapered, and a barrel engaging surface (not shown) that engages with the outer shape of the lens barrel 6 is provided on the inner wall of the lens holder 7.
- the lens barrel 6 can be fixed to the lens holder 7. Further, when fixed, the positional relationship between the center of the lens holder 7 and the center of the lens barrel 6 is uniquely determined, and the inclination of the lens barrel 6 with respect to the lens holder 7 is also uniquely determined.
- FIG. 5 is a cross-sectional view showing the configuration of the camera module according to the present embodiment.
- any of the lens driving devices 102 to 104 is used each time. Is specified.
- the camera module 200 shown in FIG. 5 includes a lens driving device 101, an image sensor (sensor) 112, a sensor cover 113, a substrate 114, a bonding wire 115, and an infrared cut filter 116.
- the imaging element 112 receives light that has passed through the imaging lens 50 housed in the lens holder 1 of the lens driving device 101.
- a CCD (Charge-Coupled Device) sensor, a CMOS (Complementary Metal Oxide Semiconductor) sensor, or the like can be used as the imaging element 112 .
- the image sensor 112 is arranged such that the center 112c of the light receiving surface of the image sensor 112 is positioned on the optical axis La of the imaging lens 50 (however, the light receiving surface itself is not shown).
- the sensor cover 113 covers the image sensor 112.
- the sensor cover 113 covers the image sensor 112 while avoiding the light receiving surface of the image sensor 112.
- the sensor cover 113 includes a leg portion 1131 and a leg portion 1132.
- the leg portion 1131 is placed on the substrate 114.
- the leg portion 1132 is placed on the upper surface (excluding the light receiving surface) of the image sensor 112. Thereby, the space
- the substrate 114 is a substrate on which the image sensor 112 and the sensor cover 113 are mounted.
- the bonding wire 115 realizes electrical connection between the image sensor 112 and the substrate 114.
- the infrared cut filter 116 is a filter having a function of blocking infrared rays, and is provided between the imaging lens 50 and the light receiving surface of the imaging element 112.
- the sensor cover 113 is provided with a concave portion 132 at a position facing the convex portion 32 of the base 3.
- the concave portion 132 has a shape opposite to (symmetrical to) the convex portion 32 and engages with the convex portion 32 when the lens driving device 101 is mounted on the sensor cover 113. Specifically, the convex portion 32 is inserted into the concave portion 132 without a gap.
- the camera module 200 it is possible to reduce the amount of positional deviation between the optical axis La of the imaging lens 50 and the center 112c of the light receiving surface of the imaging element 112. In this case, the amount of angular deviation between the optical axis La of the imaging lens 50 and the normal line of the imaging element 112 can also be reduced. Therefore, the position of the imaging lens 50 with respect to the imaging element 112 can be determined with higher accuracy.
- the sensor cover 113 has a shape opposite to (symmetrical to) the concave portion 33 instead of the concave portion 132.
- the driving device 102 is mounted on the sensor cover 113, if a convex portion (not shown) that engages the concave portion 33 is provided, the same effect as described above can be obtained.
- the convex portion of the sensor cover 113 is inserted into the concave portion 33 without a gap.
- the convex portion engaging surface (not shown) that engages with the outer shape of the convex portion 32 on the inner wall of the concave portion 132. If this is provided, the same effect as described above can be obtained. Specifically, the convex portion 32 having a tapered shape in its outer shape is inserted into the concave portion 132 having the convex portion engaging surface without a gap. From this, it can be understood that the “convex engaging surface” is a surface having a shape opposite to (symmetrical to) the tapered shape provided on the convex portion 32.
- the lens driving device 103 can be fixed to the sensor cover 113. Further, when fixed, the positional relationship between the center of the sensor cover 113 and the center of the lens driving device 103 is uniquely determined, and the inclination of the lens driving device 103 with respect to the sensor cover 113 is also uniquely determined.
- the first protrusion 13 is in contact with the upper surface of the sensor cover 113.
- the upper surface of the sensor cover 113 is in contact with the bottom surface of the base 3.
- the first protrusion 13 originally penetrates the space defined by the base 3, and the tip thereof is located below the bottom surface of the base 3.
- the lens holder 1 Due to the positional relationship between the base 3, the first protrusion 13, and the upper surface of the sensor cover 113, the lens holder 1 is moved by the sensor cover 113 when the first protrusion 13 is in contact with the upper surface of the sensor cover 113. , And held in a state of being lifted from the base 3. At this time, the lens holder 1 is lifted until the tip of the first protrusion 13 reaches the height of the bottom surface of the base 3. However, in the case of a lens holder that does not include the first protrusion 13, the lens holder may not be lifted.
- a lens driving device includes a lens holder that houses an imaging lens therein, and a base that forms a bottom and supports the lens holder.
- the lens holder is provided with a holder taper surface having a tapered shape whose diameter decreases from the upper surface side to the bottom surface side of the base, and the base is associated with the holder taper surface.
- a holder taper engagement surface is provided, and when the lens holder is supported by the base, the holder taper surface and the holder taper engagement surface engage with each other.
- the lens holder when the lens holder is supported by the base, the holder taper surface and the holder taper engagement surface engage with each other. Thereby, the lens holder can be fixed to the base. Further, when fixed, the positional relationship between the center of the base and the center of the lens holder is uniquely determined, and the inclination of the lens holder with respect to the base is also uniquely determined.
- a camera module when a camera module is configured by combining the lens driving device with an image sensor or the like, it is possible to reduce the amount of positional deviation between the optical axis of the image pickup lens and the center of the light receiving surface of the image sensor. In this case, it is also possible to reduce the amount of angular deviation between the optical axis of the imaging lens and the normal line of the imaging device. Therefore, it is possible to determine the position of the imaging lens with respect to the imaging element with higher accuracy.
- a lens driving device includes a lens holder that houses an imaging lens therein, and a base that forms a bottom and supports the lens holder.
- the base is an annular member
- the lens holder includes a first protrusion formed on a bottom portion of the lens holder and a first protrusion formed on an outer wall of a side surface of the lens holder.
- the first protrusion penetrates the space defined by the base, and the second protrusion is the imaging unit. It is characterized by abutting on the upper surface of the base so as to suppress the tilt of the lens.
- the second protrusion comes into contact with the upper surface of the base so as to suppress the tilt of the imaging lens.
- the camera module when configured by combining the lens driving device with an image sensor or the like, it is possible to reduce the amount of angular deviation between the optical axis of the image pickup lens and the normal line of the image sensor.
- the first protrusion can be reliably brought into contact with the sensor cover that covers the image pickup device, and with this contact, determination of the position of the image pickup lens with respect to the image pickup device can be performed more reliably. Can be done. Therefore, it is possible to determine the position of the imaging lens with respect to the imaging element with higher accuracy.
- the base is an annular member
- the lens holder is provided with a first protrusion formed at the bottom of the lens holder. Is supported by the base, the first protrusion penetrates the space defined by the base.
- the lens holder is provided with a second protrusion formed on the outer wall of the side surface of the lens holder, and the lens holder is supported by the base.
- the second protrusion comes into contact with the upper surface of the base so as to suppress the tilt of the imaging lens.
- a lens driving device does not include a lens barrel that is housed in the lens holder and that houses the imaging lens, and the imaging lens has a tapered outer shape.
- a lens engaging surface that engages with an outer shape of the imaging lens is provided on an inner wall.
- the imaging lens can be fixed to the lens holder. Further, when fixed, the positional relationship between the center of the lens holder and the center of the imaging lens is determined uniquely, and the inclination of the imaging lens with respect to the lens holder is also determined uniquely.
- a camera module when a camera module is configured by combining the lens driving device with an image sensor or the like, it is possible to reduce the amount of positional deviation between the optical axis of the image pickup lens and the center of the light receiving surface of the image sensor. In this case, it is also possible to reduce the amount of angular deviation between the optical axis of the imaging lens and the normal line of the imaging device. Therefore, it is possible to determine the position of the imaging lens with respect to the imaging element with higher accuracy.
- a lens driving device includes a lens barrel that is housed in the lens holder and that houses the imaging lens, and the lens barrel has a tapered outer shape.
- a barrel engaging surface that engages with the outer shape of the lens barrel is provided on the inner wall.
- the lens barrel can be fixed to the lens holder. Further, when fixed, the positional relationship between the center of the lens holder and the center of the lens barrel is uniquely determined, and the inclination of the lens barrel with respect to the lens holder is also uniquely determined.
- a camera module includes an imaging device that receives light that has passed through the lens driving device according to an aspect of the present invention and the imaging lens housed in the lens holder of the lens driving device.
- An element and a sensor cover that covers the imaging element are provided.
- the lens driving device includes the base mounted on the sensor cover, and the base includes a convex portion on a surface facing the sensor cover.
- the sensor cover is provided with a concave portion that engages with the convex portion at a position facing the convex portion.
- the lens driving device includes the base mounted on the sensor cover, and the base includes a recess on a surface facing the sensor cover.
- the sensor cover is provided with a convex portion that engages with the concave portion at a position facing the concave portion.
- the lens driving device it is possible to accurately align the lens driving device and the sensor cover.
- the camera module it is possible to reduce the amount of positional deviation between the optical axis of the imaging lens and the center of the light receiving surface of the imaging element.
- the convex portion has a tapered outer shape
- the concave portion is provided with a convex portion engaging surface that engages with the outer shape of the convex portion on the inner wall.
- the lens driving device can be fixed to the sensor cover. Further, when fixed, the positional relationship between the center of the sensor cover and the center of the lens driving device is uniquely determined, and the inclination of the lens driving device with respect to the sensor cover is also uniquely determined.
- a camera module includes an imaging device that receives light that has passed through the lens driving device according to an aspect of the present invention and the imaging lens housed in the lens holder of the lens driving device.
- An element and a sensor cover that covers the imaging element, wherein the first protrusion of the lens holder is in contact with the upper surface of the sensor cover, and the first protrusion is in contact with the upper surface of the sensor cover.
- the lens holder is held by the sensor cover while being lifted from the base.
- the present invention it is possible to reduce the deterioration of the optical characteristics due to the optical axis shift caused by the variation in the assembly accuracy, and the original performance of the image sensor and the image pickup lens is brought out.
- a small camera module can be provided.
- the lens holder leg protrudes from the bottom surface of the base. According to this, when the lens driving device is assembled to the sensor cover, the legs of the lens holder can be reliably brought into contact with the sensor cover, and high precision is achieved to such an extent that the initial focus position adjustment at infinity is unnecessary. A lens can be attached.
- a taper surface (holder taper surface) is provided on the outer wall surface of the leg portion of the lens holder, and the taper surface of the lens holder engages with a taper (holder taper engagement surface) provided on the inner wall surface of the base.
- the center of the base and the center of the lens holder can be matched with high accuracy by the engagement of the tapered surface of the outer wall surface of the leg portion of the lens holder and the taper of the inner wall surface of the base.
- the tilt of the lens holder can also be corrected.
- a convex portion (second projecting portion) is provided on the outer peripheral side surface of the lens holder, and the convex portion comes into contact with the upper surface of the base. According to this, even if the leg portion of the lens holder is not in contact with the base, the tilt of the lens holder with respect to the base can be corrected.
- the lens unit (imaging lens) has an outer peripheral side surface formed in a part of a cone, and a tapered surface (lens engaging surface) that engages or fits with the outer peripheral side surface of the lens unit is the lens holder. It is provided on the side of the inner wall. According to this, the center of a lens unit and the center of a lens holder can be match
- the tapered surface of the lens holder is engaged with the tapered surface which is a receiving surface provided on the object side edge of the lens unit. According to this, in the lens driving device having a structure in which the lens holder directly holds the lens unit, the lens holder and the lens unit are engaged with each other on the tapered surface of the lens holder, so that the optical center of the lens unit and the lens holder are The optical axis center can be matched.
- the convex portion on the lower surface of the base of the lens driving device and the concave portion on the upper surface of the sensor cover are engaged to determine the position of the base and the sensor cover. According to this, the convex part of the lower surface of the base of the lens driving device and the concave part of the upper surface of the sensor cover are engaged to determine the position of the base and the sensor cover, and the center of the sensor cover and the center of the base coincide. Can be made.
- the concave portion on the lower surface of the base of the lens driving device and the convex portion on the upper surface of the sensor cover are engaged to determine the position of the base and the sensor cover. According to this, the concave portion on the lower surface of the base of the lens driving device and the convex portion on the upper surface of the sensor cover are engaged to determine the positions of the base and the sensor cover, and the center of the sensor cover and the center of the base coincide with each other. Can be made.
- the taper surface provided on the convex portion or concave portion on the lower surface of the base of the lens driving device and the taper surface provided on the convex portion or concave portion on the upper surface of the sensor cover are engaged to thereby position the base and the sensor cover.
- the tapered surface of the concave portion is the convex portion engaging surface.
- the present invention can be used for a lens driving device capable of realizing an autofocus function, and a camera module including the lens driving device and having an autofocus function.
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Abstract
Description
図1は、第1の実施の形態に係るレンズ駆動装置の構成を示す断面図である。
図2は、第2の実施の形態に係るレンズ駆動装置の構成を示す断面図である。
図3は、第3の実施の形態に係るレンズ駆動装置の構成を示す断面図である。
図4は、第4の実施の形態に係るレンズ駆動装置の構成を示す断面図である。
図4に示すレンズ駆動装置104は、レンズバレルを備えていない構成であるが、レンズバレルを備えていてもよい。すなわち、レンズ駆動装置104の特徴的な構成を、レンズバレルを備えたレンズ駆動装置に応用することができる。
図5は、本実施の形態に係るカメラモジュールの構成を示す断面図である。
本発明の一態様に係るレンズ駆動装置は、上記の問題を解決するために、撮像レンズを内部に収容するレンズホルダと、底部を構成し、かつ上記レンズホルダを支持するベースとを備えているレンズ駆動装置であって、上記レンズホルダには、上記ベースの上面側から底面側に向かって径が小さくなるテーパ形状であるホルダテーパ面が設けられており、上記ベースには、上記ホルダテーパ面と係合するホルダテーパ係合面が設けられており、上記レンズホルダが上記ベースにより支持されているとき、上記ホルダテーパ面と上記ホルダテーパ係合面とが係合することを特徴としている。
VCM単独での性能評価(ベースに対するレンズホルダのTILT評価)には、レンズホルダの一部がベースに当接してなければならず、第1突出部によるテーパ面での当接、あるいは、第2突出部での当接が必須である。
2 駆動部
3 ベース
6 レンズバレル
7 レンズホルダ
12 ホルダテーパ面
13 第1突出部
14 第2突出部
15 レンズ係合面
31 ホルダテーパ係合面
32 凸部
33 凹部
50 撮像レンズ
51 撮像レンズ
101 レンズ駆動装置
102 レンズ駆動装置
103 レンズ駆動装置
104 レンズ駆動装置
112 撮像素子
113 センサーカバー
132 凹部
200 カメラモジュール
La 光軸
Lb 光軸
Claims (11)
- 撮像レンズを内部に収容するレンズホルダと、
底部を構成し、かつ上記レンズホルダを支持するベースとを備えているレンズ駆動装置であって、
上記レンズホルダには、上記ベースの上面側から底面側に向かって径が小さくなるテーパ形状であるホルダテーパ面が設けられており、
上記ベースには、上記ホルダテーパ面と係合するホルダテーパ係合面が設けられており、
上記レンズホルダが上記ベースにより支持されているとき、上記ホルダテーパ面と上記ホルダテーパ係合面とが係合することを特徴とするレンズ駆動装置。 - 撮像レンズを内部に収容するレンズホルダと、
底部を構成し、かつ上記レンズホルダを支持するベースとを備えているレンズ駆動装置であって、
上記ベースは、環状の部材であり、
上記レンズホルダには、
上記レンズホルダの底部に形成された第1突出部と、
上記レンズホルダの側面の外壁に形成された第2突出部とが設けられており、
上記レンズホルダが上記ベースにより支持されているとき、
上記第1突出部は、上記ベースにより規定される空間を貫通し、
上記第2突出部は、上記撮像レンズの傾きを抑制するように、上記ベースの上面に当接することを特徴とするレンズ駆動装置。 - 上記ベースは、環状の部材であり、
上記レンズホルダには、
上記レンズホルダの底部に形成された第1突出部が設けられており、
上記レンズホルダが上記ベースにより支持されているとき、
上記第1突出部は、上記ベースにより規定される空間を貫通することを特徴とする請求項1に記載のレンズ駆動装置。 - 上記レンズホルダには、
上記レンズホルダの側面の外壁に形成された第2突出部が設けられており、
上記レンズホルダが上記ベースにより支持されているとき、
上記第2突出部は、上記撮像レンズの傾きを抑制するように、上記ベースの上面に当接することを特徴とする請求項3に記載のレンズ駆動装置。 - 上記レンズホルダの内部に収容され、かつ上記撮像レンズを内部に収容するレンズバレルを備えておらず、
上記撮像レンズは、外形がテーパ形状であり、
上記レンズホルダは、内壁に、上記撮像レンズの外形と係合するレンズ係合面が設けられていることを特徴とする請求項1に記載のレンズ駆動装置。 - 上記レンズホルダの内部に収容され、かつ上記撮像レンズを内部に収容するレンズバレルを備えており、
上記レンズバレルは、外形がテーパ形状であり、
上記レンズホルダは、内壁に、上記レンズバレルの外形と係合するバレル係合面が設けられていることを特徴とする請求項1に記載のレンズ駆動装置。 - 請求項1に記載のレンズ駆動装置と、
上記レンズ駆動装置の上記レンズホルダの内部に収容された上記撮像レンズを通過した光を受光する撮像素子と、
上記撮像素子を覆うセンサーカバーとを備えていることを特徴とするカメラモジュール。 - 上記レンズ駆動装置は、上記ベースが上記センサーカバーに搭載されており、
上記ベースは、上記センサーカバーと対向する面に凸部が設けられており、
上記センサーカバーは、上記凸部と対向する位置に、該凸部と係合する凹部が設けられていることを特徴とする請求項7に記載のカメラモジュール。 - 上記レンズ駆動装置は、上記ベースが上記センサーカバーに搭載されており、
上記ベースは、上記センサーカバーと対向する面に凹部が設けられており、
上記センサーカバーは、上記凹部と対向する位置に、該凹部と係合する凸部が設けられていることを特徴とする請求項7に記載のカメラモジュール。 - 上記凸部は、外形がテーパ形状であり、
上記凹部は、内壁に、上記凸部の外形と係合する凸部係合面が設けられていることを特徴とする請求項8に記載のカメラモジュール。 - 請求項2に記載のレンズ駆動装置と、
上記レンズ駆動装置の上記レンズホルダの内部に収容された上記撮像レンズを通過した光を受光する撮像素子と、
上記撮像素子を覆うセンサーカバーとを備えており、
上記レンズホルダの第1突出部は、上記センサーカバーの上面に当接し、
上記第1突出部が上記センサーカバーの上面に当接しているとき、上記レンズホルダは、上記センサーカバーにより、上記ベースから持ち上げられた状態で保持されていることを特徴とするカメラモジュール。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CN201380045558.5A CN104603660A (zh) | 2012-08-31 | 2013-07-30 | 透镜驱动装置和摄像机组件 |
JP2014532892A JPWO2014034360A1 (ja) | 2012-08-31 | 2013-07-30 | レンズ駆動装置、およびカメラモジュール |
US14/423,539 US20150301305A1 (en) | 2012-08-31 | 2013-07-30 | Lens drive apparatus and camera module |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2012-192492 | 2012-08-31 | ||
JP2012192492 | 2012-08-31 |
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JP (1) | JPWO2014034360A1 (ja) |
CN (1) | CN104603660A (ja) |
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WO (1) | WO2014034360A1 (ja) |
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JP6262536B2 (ja) * | 2014-01-08 | 2018-01-17 | 新光電気工業株式会社 | カメラモジュールの製造方法 |
JP6630226B2 (ja) * | 2016-04-27 | 2020-01-15 | 日立オートモティブシステムズ株式会社 | 撮像モジュールおよび撮像装置 |
TWI696878B (zh) * | 2019-08-01 | 2020-06-21 | 大陸商廣州立景創新科技有限公司 | 攝影裝置與攝影裝置的製造方法 |
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2013
- 2013-07-30 US US14/423,539 patent/US20150301305A1/en not_active Abandoned
- 2013-07-30 JP JP2014532892A patent/JPWO2014034360A1/ja active Pending
- 2013-07-30 WO PCT/JP2013/070639 patent/WO2014034360A1/ja active Application Filing
- 2013-07-30 CN CN201380045558.5A patent/CN104603660A/zh active Pending
- 2013-08-13 TW TW102129030A patent/TW201413317A/zh unknown
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JP2002250853A (ja) * | 2001-02-22 | 2002-09-06 | Ricoh Co Ltd | レンズ保持装置 |
JP2003131112A (ja) * | 2001-10-29 | 2003-05-08 | Fujitsu Ltd | カメラモジュール及びその製造方法 |
JP2004070024A (ja) * | 2002-08-07 | 2004-03-04 | Mitsui Chemicals Inc | 撮像装置および撮像装置用成形基板 |
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JPWO2014034360A1 (ja) | 2016-08-08 |
US20150301305A1 (en) | 2015-10-22 |
CN104603660A (zh) | 2015-05-06 |
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