WO2015076056A1 - 撮像モジュールおよびその製造方法 - Google Patents
撮像モジュールおよびその製造方法 Download PDFInfo
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- WO2015076056A1 WO2015076056A1 PCT/JP2014/078215 JP2014078215W WO2015076056A1 WO 2015076056 A1 WO2015076056 A1 WO 2015076056A1 JP 2014078215 W JP2014078215 W JP 2014078215W WO 2015076056 A1 WO2015076056 A1 WO 2015076056A1
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- WIPO (PCT)
- Prior art keywords
- lens group
- fixed
- imaging
- optical axis
- camera module
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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
- G02B7/08—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
- 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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- 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
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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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- 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 an imaging module capable of positioning a lens and an imaging element with high accuracy and a manufacturing method for manufacturing the imaging module.
- imaging modules are mainly used in portable devices such as mobile phones with cameras and personal digital assistants (PDAs).
- PDAs personal digital assistants
- an imaging element having a plurality of light-receiving units that photoelectrically convert image light from a subject to image and a lens for imaging incident light on the imaging element are modularized (integrated).
- the small imaging module mainly includes a sensor chip (solid-state imaging chip) disposed on a substrate such as ceramics or epoxy resin with glass.
- An image sensor having a plurality of light receiving portions in a two-dimensional shape is disposed at the center of the sensor chip.
- the small imaging module includes an actuator.
- the actuator moves a holder in which a lens for imaging incident light on the image sensor is fixed inside the small imaging module up and down.
- a camera module 100a is shown in FIG. 8 as an example of the above-described small imaging module.
- the sensor chip 110 is attached on the substrate 109 with an adhesive (not shown).
- a plurality of pads (not shown) are provided on the outer periphery of the sensor chip 110, and the pads and terminals (not shown) of the substrate 109 are wire-bonded and electrically connected by wires 111. Yes.
- the camera module 100a includes an actuator 101.
- the actuator 101 includes a holder 104, a coil 105 wound around the outer periphery of the holder 104, a yoke 107, a magnet 106, and a base 108 fixed to the substrate 109.
- the yoke 107 is a metal member and is provided on the outer periphery of the coil 105 to electrically shield the camera module 100a from the outside.
- the magnet 106 is disposed inside the yoke 107 with a predetermined gap from the coil 5.
- the barrel 103 is fixed inside the holder 104 by an adhesive (not shown).
- the barrel 103 surrounds the periphery of the lens 102, and the lens 102 is held inside the barrel 103.
- an electromagnetic force is generated between the coil 105 and the magnet 106 by passing a current through the coil 105.
- the holder 104 is displaced in the optical axis direction of the lens 102 together with the lens 102 and the barrel 103 by the electromagnetic force.
- the amount of displacement is controlled by the amount of current flowing through the coil 105.
- the structure of the actuator 101 described above is a general VCM (Voice Coil Motor) structure.
- the actuator 101 is fixed to the substrate 109 by fixing the base 108 to the substrate 109 with the adhesive 114.
- the IR cut filter 112 is inserted and fixed between the sensor chip 110 and the lens 102.
- the IR cut filter 112 eliminates infrared light incident on the sensor chip 110.
- the base 108 may move while the adhesive 114 is cured (for example, stored at a high temperature). Etc.
- Patent Document 1 and Patent Document 2 describe a camera module that further includes a lens on an image sensor and performs positioning of the image sensor and the lens with high accuracy by a positioning structure provided around the lens. And a solid-state imaging device.
- a barrel that holds a first lens, a drive mechanism that adjusts the position of the first lens in the optical axis direction of the first lens, and solid-state imaging of the first lens.
- a structure for abutting the barrel so as to face the element the first lens is sandwiched between the barrels, and the second lens is provided on the inner periphery of the structure.
- the device is described.
- the barrel is fixed by abutting with an inclined portion provided in the structure, so that the relationship between the first lens and the second lens, and further, the first lens and the solid-state imaging device The center and height relationship with can be set.
- the fixed lens 117 is provided on the substrate 109, and is disposed between the lens 102 and the sensor chip 110 (imaging device).
- a positioning member 116 that contacts the actuator 101 is formed on the outer periphery of the fixed lens 117.
- a cover 115 formed to substantially cover the lower surface of the holder 104, the coil 105, and the magnet 106 is provided.
- the lenses described in Patent Document 1 and Patent Document 2 also serve to correct distortion and incident light.
- JP 2009-116176 A Japanese Patent Publication “JP 2009-98462 (May 7, 2009)”
- the relative displacement between the fixed lens 117 and the lens 102 and the inclination of the optical axis are corrected by the positioning of the actuator 101 using the positioning member 116.
- the relative displacement between the fixed lens 117 fixed on the substrate and the sensor chip 110 (imaging device) and the inclination of the optical axis still include manufacturing variations.
- the relative positional deviation between the first lens and the second lens and the inclination of the optical axis are corrected by the contact of the barrel with the structure.
- the relative displacement between the second lens (fixed lens) and the solid-state imaging device and the inclination of the optical axis still include manufacturing variations.
- the active alignment is a method for determining the optimum position of the actuator on the substrate while performing fine adjustment of the position using an optical or electrical image to be formed as a feedback amount.
- the present invention has been made to solve the above-described problems, and an object thereof is to provide an imaging module capable of positioning a lens and an imaging device with high accuracy.
- an imaging module includes a substrate on which an imaging element is mounted, a plurality of lenses that form an image of light from a subject on the imaging element, and the plurality of lenses.
- An imaging module including a focus adjustment mechanism fixed to the substrate, wherein the focus adjustment mechanism includes a movable portion that is displaced in a direction of an optical axis of the plurality of lenses, and a direction of the optical axis.
- a second lens group comprising one or more lenses selected from the above is fixed to the non-movable part.
- an imaging module (camera module) capable of positioning a lens and an imaging element with high accuracy.
- Embodiment 1 a camera module 50 (imaging module) according to Embodiment 1 of the present invention will be described with reference to FIGS.
- FIG. 1 is a longitudinal sectional view showing an example of the configuration of the main part of the camera module 50.
- the camera module 50 moves the position of the optical lens in the optical axis direction when the subject is at infinity or at a very close macro position, and focuses the image formed on the imaging surface (focusing).
- This is a small imaging module with an auto focus (AF) function.
- the camera module 50 includes a first lens group 1, a second lens group 2, a barrel 3, an actuator 20A (focus adjustment mechanism), and an imaging unit 21, as shown in FIG.
- the actuator 20 ⁇ / b> A and the imaging unit 21 are overlapped in the optical axis direction of the first lens group 1 and the second lens group 2.
- the first lens group side (subject side) will be described as the upper side, and the imaging unit 21 side will be described as the lower side. However, this does not define the vertical direction when in use. There may be.
- the first lens group 1 includes a plurality of optical lenses 1a (lenses) and optical lenses 1b (lenses) whose optical axes coincide with each other, and guides light from the outside to the second lens group 2.
- the first lens group 1 is fixed to an upper barrel 3a described later.
- the second lens group 2 includes at least one optical lens 2 a (lens) whose optical axis coincides with that of the first lens group 1, and the sensor chip 10 (imaging device) of the imaging unit 21 receives light from the first lens group 1. Lead to.
- the second lens group 2 is disposed between the first lens group 1 and the imaging unit 21.
- the second lens group 2 is fixed to a lower barrel 3b described later.
- a lens group in which the first lens group 1 and the second lens group 2 are combined is referred to as a joint lens group 22.
- the barrel 3 includes an upper barrel 3a and a lower barrel 3b in order to hold the first lens group 1 and the second lens group 2.
- the axes of the upper barrel 3a and the lower barrel 3b coincide with the optical axes of the first lens group 1 and the second lens group 2.
- the upper barrel 3a holds the first lens group 1 in the hollow portion.
- the upper barrel 3a is fixed to the inner peripheral wall of the holder 4 which is a part of an actuator 20A described later.
- the lower barrel 3b is disposed between the upper barrel 3a and the imaging unit 21, and holds the second lens group 2 on its inner peripheral wall.
- the lower barrel 3b is fixed to a base 8 which is a part of an actuator 20A described later.
- the actuator 20A is a device for displacing the first lens group 1 in the optical axis direction during focusing.
- the actuator 20A includes a holder 4, a coil 5, a magnet 6, a yoke 7, and a base 8.
- the holder 4 is an annular member, and holds the upper barrel 3a with an inner peripheral wall.
- the holder 4 is supported so as to be displaceable in the optical axis direction with respect to a yoke 7 and a base 8 to be described later.
- the method for supporting the holder 4 is not particularly limited.
- a spring spring configured such that the spring constant in the direction perpendicular to the optical axis is significantly larger than the spring constant in the optical axis direction is used, and the upper end portion (the end portion on the subject side) of the holder 4 is used.
- the yoke 7 is made of, for example, a metal member and has a shape surrounding the holder 4.
- the camera module 50 is electrically disconnected from the outside by the yoke 7.
- a magnet 6 is fixed to the inner peripheral wall of the yoke.
- the coil 5 is wound around the outer peripheral wall of the holder 4 and fixed.
- the magnet 6 is fixed to the inner peripheral wall of the yoke 7 with a predetermined gap between it and the coil 5.
- the holder 4 when an electric current is passed through the coil 5, an electromagnetic force is generated between the coil 5 and the magnet 6.
- this electromagnetic force acts on the holder 4, the holder 4 is displaced together with the upper barrel 3 a and the first lens group 1 in the optical axis direction. That is, the first lens group 1 can be displaced in the optical axis direction by passing a current through the coil 5.
- the base 8 is a member located below the yoke 7 and is connected to the yoke 7.
- the base 8 is placed so as to cover the outer peripheral portion of the substrate 9.
- the base 8 has a convex portion 8b that protrudes downward at the inner peripheral portion on the lower side surface and a convex portion 8c that protrudes upward at the inner peripheral portion on the upper side surface.
- the convex portion 8 b has an opening portion 8 a penetrating in the vertical direction on the imaging surface side of the sensor chip 10.
- the convex portion 8c is formed in an annular shape, and the lower barrel 3b is fixed to the inner peripheral wall. Thereby, the second lens group 2 is fixed to the base 8.
- the base 8 has a cover portion 8d that protrudes downward at the outer peripheral portion on the lower surface.
- the lower end surface of the cover portion 8d is fixed to the substrate 9 via the adhesive 14. Accordingly, the base 8 is fixed to the substrate 9 and the actuator 20A is fixed to the substrate 9.
- the actuator 20A is a device that displaces the first lens group 1 in the optical axis direction during focusing.
- the holder 4 and the coil 5 are displaced during focusing, and the magnet 6, the yoke 7, and the base 8 are not displaced during focusing. That is, the holder 4 and the coil 5 function as a focus movable part (movable part) that is displaced during focusing, and the magnet 6, the yoke 7, and the base 8 function as a focus fixing part (non-movable part) that is not displaced during focusing. Therefore, at the time of focusing, the first lens group 1 fixed to the focus movable part is displaced in the optical axis direction, and the second lens group 2 fixed to the focus fixing part is not displaced at the time of focusing.
- the camera module 50 does not include a fixed lens fixed on the substrate as shown in FIG.
- the imaging unit 21 includes a substrate 9, a sensor chip 10 (imaging device), an IR cut filter 12, and peripheral components 13.
- the IR cut filter 12 is provided in the base 8 so as to block the opening 8a, and excludes the incidence of infrared light on the sensor chip 10.
- the sensor chip 10 is mounted on the substrate 9 with an adhesive (not shown), receives light that has arrived via the first lens group 1 and the second lens group 2, performs photoelectric conversion, and then performs sensor conversion on the sensor chip 10. To obtain a subject image formed on.
- the axis of the sensor chip 10 coincides with the optical axes of the first lens group 1 and the second lens group 2.
- a plurality of pads are provided on the outer periphery of the sensor chip 10, and the pads and terminals (not shown) of the substrate 9 are wire-bonded by wires 11 and are electrically connected.
- peripheral components 13 are appropriately attached to the substrate 9.
- the upper surface of the substrate 9 and the lower end surface of the cover portion 8 d of the base 8 are fixed by an adhesive 14.
- the camera module 50 includes the first lens group 1 and the second lens group 2 as described above.
- the first lens group 1 is fixed to the focus movable part, and the second lens group 2 is fixed to the focus fixing part. For this reason, the camera module 50 can reduce the feeding amount (stroke) during focusing. Details will be described below with reference to FIGS.
- FIG. 2 is a diagram for explaining focusing in the conventional camera module 100a.
- 2A shows a state in which an image obtained when the subject is at infinity is formed on the imaging surface
- FIG. 2B shows an image obtained when the subject is at the macro position.
- FIG. 2C shows a state in which an image is formed behind the imaging surface.
- FIG. 2C shows an image formed on the imaging surface again as shown in FIG. 2B.
- a plurality of lenses 102 are all fixed to a holder 104 (see FIG. 8), and the plurality of lenses 102 are displaced together during focusing.
- an image obtained when the subject is at infinity is formed on the imaging surface.
- the image is blurred because the imaging position moves behind the imaging surface.
- a current is passed through the coil 105 fixed to the outer periphery of the holder 104 in the actuator 101, and an electromagnetic force is generated between the coil 105 and the magnet 106.
- the actuator 101 displaces the barrel 103 and the holder 104 that fix the plurality of lenses 102 by the generated electromagnetic force, and feeds the plurality of lenses 102 away from the imaging surface in the optical axis direction. This feed amount is called a stroke (between infinity and macro).
- FIG. 3 is a diagram for explaining focusing in the camera module 50 according to the present embodiment.
- 3A shows a state where an image obtained when the subject is at infinity is formed on the imaging surface
- FIG. 3B shows an image obtained when the subject is at the macro position.
- FIG. 3C shows a state in which an image is formed behind the imaging surface
- FIG. 3C shows an image formed on the imaging surface again after the imaging surface as shown in FIG. 3B. Indicates the state of the
- an image obtained when the subject is at infinity is formed on the imaging surface.
- the image is blurred because the imaging position moves behind the imaging surface.
- an electric current is passed through the coil 5 fixed to the outer periphery of the holder 4 in the actuator 20 ⁇ / b> A to generate an electromagnetic force between the coil 5 and the magnet 6.
- the actuator 20A displaces the upper barrel 3a that fixes the first lens group 1 and the holder 4 by the generated electromagnetic force, and feeds the first lens group 1 away from the imaging surface in the optical axis direction.
- the lens group extended to the side away from the imaging surface in the optical axis direction is only the first lens group 1, and the second lens group 2 is fixed to the focus fixing portion and thus is not displaced.
- the optical lenses 1a, 1b, and 2a with respect to the optical axis is steeper than the angle with respect to the optical axis of light traveling from the second lens group 2 toward the imaging surface (light emitted from the second lens group to the sensor chip 10) (
- the optical lenses constituting the first lens group 1 and the second lens group 2 are designed so as to be larger.
- the camera module 50 according to the first embodiment has a larger stroke amount than the conventional camera module 100a.
- the stroke amount is smaller.
- the required stroke amount in the 1 / 1.33 optical inch system is 400 ⁇ m in the conventional camera module, whereas the camera module 50 may be 250 ⁇ m.
- the camera module 50 can perform more efficient focusing than the conventional camera module 100a, and can form an image obtained from the subject with a small stroke amount on the imaging surface.
- the camera module 50 has a small stroke amount required for focusing, and only the first lens group 1 is displaced during focusing due to the above configuration. For this reason, the amount of displacement of the focus movable part during focusing is small and the weight is light. As a result, the moving tilt generated by the actuator 20A is suppressed, and image quality deterioration such as blurring is improved.
- the camera module 50 has a small stroke amount required for focusing, the image quality obtained in the macro mode can be kept relatively good.
- the first lens group 1 and the second lens group 2 are designed so that an image can be obtained with optimum image quality when the subject is at infinity. For this reason, when the first lens group 1 is moved by the stroke, the image quality of the obtained image is not optimal.
- the camera module 50 according to the first embodiment requires a small stroke amount at the time of focusing, the difference between the image quality of the image obtained at the macro time and the optimum image quality is reduced. Therefore, the image quality of the image obtained optimally in the macro mode is kept relatively good.
- the height of the camera module 50 can be lowered by a reduced stroke amount.
- the weight of the focus movable part is reduced. Therefore, the design of the actuator 20A can be afforded, the actuator 20A can be downsized, and the camera module 50 can be downsized.
- the camera module 50 requires a small stroke amount for focusing and the weight of the focus movable part is light. Therefore, power consumption during focusing can be reduced.
- the second lens group 2 is disposed between the first lens group 1 and the IR cut filter 12, and is fixed to the base 8 via the lower barrel 3b. For this reason, it is possible to suppress the occurrence of a stain defect due to a foreign matter generated by a strong impact or the like.
- the holder 104 for fixing the lens 102 is fixed to the yoke 107 and the base 108 by a spring or the like, for example. Therefore, when the holder 104 receives a strong impact or the like, the holder 104 easily collides with the peripheral member, and foreign matter is generated by rubbing between the holder 104 and the peripheral member. At that time, since there is nothing to block, the foreign matter may fall on the surface of the IR cut filter 112 located above the sensor chip 110. Since the sensor chip 110 and the IR cut filter 112 are at a short distance, the foreign matter forms an image on the sensor chip 110, resulting in an electrically blurred image.
- the second lens group 2 is disposed between the first lens group 1 and the IR cut filter 12. Therefore, the foreign matter falls on the second lens group 2. Since the second lens group 2 is located away from the sensor chip 10, the foreign matter does not form an image on the sensor chip 10. Therefore, it is possible to suppress the occurrence of a stain defect due to a foreign matter generated by a strong impact or the like.
- the first lens group 1 is fixed to the focus movable part, and the second lens group 2 is fixed to the focus fixing part.
- the first lens group 1 can be fixed to the focus movable part after the second lens group 2 is fixed to the focus fixing part. Therefore, as will be described later, when the first lens group 1 is fixed to the focus movable part, it can be fixed after performing optical active alignment. As a result, it is possible to prevent the occurrence of positional deviation and optical axis deviation between the first lens group 1 and the second lens group 2.
- the same effect can be expected when the second lens group 2 is fixed to the focus fixing part after the first lens group 1 is fixed to the focus movable part.
- the actuator 20A in which the positions of the first lens group 1 and the second lens group 2 are adjusted is fixed to the substrate 9. For this reason, as will be described later, when the actuator 20A is fixed to the substrate 9, it can be fixed after executing electrical active alignment. As a result, it is possible to prevent occurrence of positional deviation and optical axis deviation between the sensor chip 10 (imaging device) mounted on the substrate 9 and the first lens group 1 and the second lens group 2 (joint lens group 22). can do. Details will be described below.
- FIG. 4 is a diagram illustrating production steps of the camera module 50 according to the first embodiment of the present invention. In addition, description is abbreviate
- FIG. 4 is a diagram illustrating production steps of the camera module 50 according to the first embodiment of the present invention. In addition, description is abbreviate
- step 1 the second lens group 2 including the optical lens 2a is fixed to the lower barrel 3b.
- the second lens group 2 and the lower barrel 3b are fixed by, for example, an adhesive.
- the lower barrel 3b is fixed to the base 8 with an adhesive (not shown).
- the lower barrel 3 b is fixed at a predetermined position inside the convex portion 8 c in the base 8. The predetermined position is determined in advance by adjusting the height with a jig or the like. Accordingly, the second lens group 2 is fixed to the base 8 of the actuator 20A together with the lower barrel 3b.
- step 2 the first lens group 1 including the optical lens 1a and the optical lens 1b is fixed to the upper barrel 3a.
- the first lens group 1 and the upper barrel 3a are fixed by, for example, an adhesive.
- the upper barrel 3a is fixed to the holder 4 with an adhesive (not shown) (first lens group fixing step).
- first lens group fixing step the upper barrel 3 a is fixed to the holder 4 after adjusting the fixing position. The adjustment of the fixed position will be described below.
- step 2 in order to adjust the fixed position, a resolution pattern or the like is optically imaged by the first lens group 1 and the second lens group 2, and data of the imaged image is fed back to Optical active alignment is executed to finely adjust the fixed position of the barrel 3a in the holder 4 to the optimum position.
- the optical active alignment is a fine adjustment of the position of the upper barrel 3a in the holder 4 and includes not only the vertical direction but also a fine adjustment of the tilt (first lens group adjustment step).
- the resolution pattern is generated by the second lens group 2 fixed to the base 8 of the actuator 20A and the first lens group 1 fixed to the upper barrel 3a temporarily disposed above the second lens group 2. Make an image.
- the position and angle of the first lens group 1 are adjusted so that the imaging position does not change even if the first lens group 1 is displaced. The adjustment is repeated until the imaging position does not change.
- step 2 when the upper barrel 3a to which the first lens group 1 is fixed is fixed to the holder 4, the images formed by the first lens group 1 and the second lens group 2 are fed back, Adjustment of the optical axis of one lens group 1 and adjustment of the distance from the first lens group 1 to the second lens group 2 are performed.
- step 3 the substrate 20, sensor chip 10, wire 11, IR cut filter 12, and peripheral component 13 are already fixed to the actuator 20 ⁇ / b> A in which the first lens group 1 and the second lens group 2 are fixed at optimal positions. It fixes to the imaging part 21 with an adhesive agent (focus adjustment mechanism fixing step). At this time, the actuator 20A is fixed to the imaging unit 21 after adjusting the fixing position. In other words, the joint lens group 22 composed of the first lens group 1 and the second lens group 2 is fixed after adjusting the fixing position with respect to the sensor chip 10. The adjustment of the fixed position will be described below.
- step 3 the first lens group 1 and the second lens group 2, that is, the joint lens group 22 and the sensor chip 10 are used to fix the image in the imaging unit 21 of the actuator 20A based on the image data of the electrical image formed by the sensor chip 10. Electrical active alignment is executed to finely adjust the position to the optimum position (focus adjustment mechanism adjustment step).
- a resolution pattern is imaged by the joint lens group 22 and the sensor chip 10, and a reference image is compared with the imaging result. Based on the comparison, the position and angle of the actuator 20A with respect to the imaging unit 21 are adjusted so that the difference between the reference image and the imaging is eliminated. The adjustment is repeated until there is no difference between the reference image and the image formation.
- the actuator 20A is fixed to the imaging unit 21. More specifically, the cover portion 8d of the base 8 is fixed to the substrate 9 with an adhesive.
- step 3 when the actuator 20 ⁇ / b> A is fixed to the substrate 9, an image formed by the joint lens group 22 and the sensor chip 10 is fed back to adjust the optical axis of the joint lens group 22, and the joint lens group. The distance from 22 to the sensor chip 10 is adjusted. It should be noted that the specified analysis level is set as appropriate.
- Step 4 after fixing the actuator 20A and the imaging unit 21 in Step 3, a predetermined test such as an imaging test is performed, and the camera module 50 is completed.
- the upper barrel 3a to which the first lens group 1 is fixed is fixed to the holder 4, the position and angle of the first lens group 1 with respect to the second lens group 2 are adjusted and then the upper barrel 3a is adjusted.
- the holder 4 can be fixed. For this reason, it is possible to prevent the occurrence of positional deviation and optical axis deviation that occur between the first lens group 1 and the second lens group 2.
- the actuator 20A when the actuator 20A is fixed to the imaging unit 21, it can be fixed after adjusting the position and angle of the joint lens group 22 with respect to the sensor chip 10. For this reason, it is possible to prevent the occurrence of positional deviation and optical axis deviation that occur between the joint lens group 22 and the sensor chip 10.
- the first lens group 1 and the second lens group 2 can be positioned with high accuracy, and further, the first lens group 1 and the second lens group 2 (joint lens group 22) and the sensor chip 10 (imaging). Element) can be positioned with high accuracy. For this reason, it is possible to prevent the camera module 50 from shading or blurring.
- step 1 the upper barrel 3a to which the first lens group 1 is fixed is fixed to the holder 4 (first lens group fixing step).
- step 2 the lower barrel 3b to which the second lens group 2 is fixed is fixed to the base 8 (second lens group fixing step).
- second lens group fixing step the images formed by the first lens group 1 and the second lens group 2 are fed back, so that the second lens group 2 Optical active alignment for adjusting the position and angle is executed.
- step 3 and step 4 are the same as step 3 and step 4 described above.
- FIG. 5 is a longitudinal sectional view showing an example of the configuration of the main part of the camera module 51.
- the camera module 51 according to the second embodiment is different from the camera module 50 according to the first embodiment in the following points.
- the camera module 50 fixes the actuator 20 ⁇ / b> A and the imaging unit 21 by fixing the cover portion 8 d of the base 8 and the substrate 9. At that time, the actuator 20A is fixed after adjusting the fixing position in the imaging unit 21 by electrical active alignment.
- the base 8 further includes a chip abutting portion 15 (abutting portion), and by bringing the chip abutting portion 15 into abutment with the sensor chip 10, the actuator 20A and the imaging unit are arranged. 21 is fixed.
- the actuator 20A and the imaging unit 21 can be fixed with high accuracy without performing the electrical active alignment in step 3. Therefore, electrical active alignment can be omitted in the manufacturing process of the camera module 51. This will be explained in detail below.
- the base 8 includes a tip abutting portion 15 protruding downward at a part of the lower end surface of the convex portion 8 b.
- the chip abutting portion 15 is formed so as to be arranged in a quadrilateral shape around the light receiving pixel area of the sensor chip 10 where light enters.
- the shape and number of the tip abutting portions 15 are not particularly limited.
- the chip abutting portions 15 may be formed in a column shape, and the number is preferably 3 or 4, but may be many.
- the actuator 20A When the actuator 20A is attached to the substrate 9 by bringing the lower end surface of the chip abutting portion 15 serving as the reference surface on the bottom surface side of the base 8 into contact with the upper surface of the sensor chip 10 without using an adhesive, the accuracy of the attachment device Therefore, it is possible to eliminate the tilt generated in the manufacturing. That is, by bringing the lower end surface of the chip abutting portion 15 into contact with the upper surface of the sensor chip 10, the joint lens group 22 can be positioned with respect to the sensor chip 10 in the optical axis direction with high accuracy regardless of the mounting device. .
- the chip abutting portion 15 in order to bring the chip abutting portion 15 into contact with the sensor chip 10, there is a gap caused by tolerance between the substrate 9 and the cover portion 8 d of the base 8. After filling the gap with an adhesive (not shown), the chip abutting portion 15 is brought into contact with the sensor chip 10. Then, heat is applied to cure the adhesive, and the base 8 and the substrate 9 are fixed. In the meantime, the chip contact portion 15 is kept in contact with the sensor chip 10.
- the tilt generated in manufacturing the actuator 20A and the sensor chip 10 can be improved. Therefore, it is possible to reduce the positional deviation and the optical axis deviation between the joint lens group 22 and the sensor chip 10 without performing electrical active alignment. As a result, it is possible to significantly improve blurring and the like. it can.
- FIG. 6 is a longitudinal sectional view showing an example of the configuration of the main part of the camera module 52.
- the camera module 52 according to the third embodiment is different from the camera module 50 according to the first embodiment in the following points.
- the camera module 50 has an AF function. Further, the lower barrel 3 b is fixed to the convex portion 8 c of the base 8.
- the camera module 52 further has an optical image stabilization (OIS: Optical Image Stabilizer) function.
- OIS optical Image Stabilizer
- the camera module 52 includes an actuator 20B, and the actuator 20B includes an OIS mechanism 23a. Further, the lower barrel 3b is fixed to the OIS mechanism 23a of the actuator 20B.
- the camera module 52 includes a first lens group 1, a second lens group 2, a barrel 3, an actuator 20 ⁇ / b> B, and an imaging unit 21.
- the first lens group 1, the second lens group 2, and the imaging unit 21 have the same configuration as the camera module 50.
- the barrel 3 and the actuator 20B are different from the camera module 50. This is explained below.
- the barrel 3 includes an upper barrel 3a and a lower barrel 3b.
- the upper barrel 3 a is the same as the upper barrel 3 a of the camera module 50.
- the lower barrel 3b holds the second lens group 2 therein.
- the lower barrel 3b is fixed to an OIS mechanism 23a of an actuator 20B described later.
- the actuator 20B displaces the first lens group 1 in the optical axis direction during focusing, and displaces the first lens group 1 and the second lens group 2 (joint lens group 22) in a direction perpendicular to the optical axis during camera shake correction. It is a device.
- the actuator 20B includes a holder 4, a coil 5, a magnet 6, a cover 16, a base 8, and an OIS mechanism 23a.
- the holder 4 is an annular member, and holds the upper barrel 3a with an inner peripheral wall.
- the holder 4 is supported so as to be displaceable in the optical axis direction with respect to an OIS mechanism 23a described later.
- the method for supporting the holder 4 is not particularly limited.
- a spring (spring) configured so that the spring constant in the direction perpendicular to the optical axis is significantly larger than the spring constant in the optical axis direction is used, and the upper and lower ends of the holder 4 are connected to the OIS mechanism 23a. It may be fixed.
- the cover 16 is formed in a shape surrounding the holder 4 and the OIS mechanism 23a.
- An OIS coil (not shown) is fixed to the inner peripheral wall of the cover 16.
- the axis of the OIS coil is perpendicular to the optical axes of the first lens group 1 and the second lens group 2.
- the coil 5 is wound around the outer peripheral wall of the holder 4 and fixed.
- the magnet 6 is fixed to the inner peripheral wall of the OIS mechanism 23a with a predetermined gap between the magnet 6 and the coil 5.
- the holder 4 when an electric current is passed through the coil 5, an electromagnetic force is generated between the coil 5 and the magnet 6. Therefore, when the electromagnetic force acts on the holder 4, the holder 4 is displaced in the optical axis direction together with the upper barrel 3 a and the first lens group 1. That is, the first lens group 1 can be displaced in the optical axis direction by passing a current through the coil 5.
- the base 8 does not have the convex portion 8c, and the lower barrel 3b is not fixed to the base 8.
- the lower barrel 3b is fixed to an OIS mechanism 23a described later.
- the OIS mechanism 23a is, for example, a member that is open at the top and bottom and is formed only by the bottom surface and the side surface, and is disposed between the holder 4, the cover 16, and the base 8.
- a magnet 6 is fixed to the inner peripheral wall of the OIS mechanism 23a.
- an OIS magnet (not shown) is fixed to the outer peripheral wall of the OIS mechanism 23a with a predetermined gap so as to face the OIS coil.
- the OIS mechanism 23a is supported so as to be displaceable in a direction perpendicular to the optical axis with respect to the base 8.
- the method for supporting the OIS mechanism 23a is not particularly limited.
- the OIS mechanism 23a may be supported using a suspension wire.
- the OIS mechanism 23a when an electric current is passed through the OIS coil, an electromagnetic force is generated between the OIS coil and the OIS magnet.
- this electromagnetic force acts on the OIS mechanism 23a, the OIS mechanism 23a is integrated with the lower barrel 3b and the second lens group 2, the holder 4, and the upper barrel 3a and the first lens group 1 to be integrated with the optical axis. Displace in the vertical direction. That is, the joint lens group 22 can be displaced in a direction perpendicular to the optical axis by passing a current through the OIS coil.
- the actuator 20B only the holder 4 and the coil 5 are displaced in the optical axis direction during focusing, and the magnet 6, the cover 16, the base 8, and the OIS mechanism 23a are not displaced during focusing. That is, the holder 4 and the coil 5 function as a focus movable part (movable part) that is displaced during focusing, and the magnet 6, the cover 16, the base 8, and the OIS mechanism 23a are used as a focus fixed part (non-movable part) that is not displaced during focusing. Function.
- the first lens group 1 fixed to the focus movable part is displaced in the optical axis direction during focusing.
- the second lens group 2 fixed to the focus fixing part is not displaced during focusing.
- the holder 4, the coil 5, the magnet 6 and the OIS mechanism 23a are displaced when the camera shake is corrected, and the cover 16 and the base 8 are not displaced when the camera shake is corrected. That is, the holder 4, the coil 5, the magnet 6, and the OIS mechanism 23 a function as an OIS movable part that is displaced during camera shake correction, and the cover 16 and the base 8 function as an OIS fixing part that is not displaced during camera shake correction.
- the OIS mechanism 23a (camera shake correction mechanism) displaces the focus movable part (movable part) and the second lens group 2 in a direction perpendicular to the optical axis with respect to the base 8 and the cover 16.
- the first lens group 1 and the second lens group 2 fixed to the OIS movable portion, that is, the joint lens group 22 are displaced in a direction perpendicular to the optical axis during camera shake correction.
- the OIS mechanism 23a is displaced integrally with the congruent lens group 22 in the direction perpendicular to the optical axis and performs camera shake correction. Therefore, the position of the second lens group 2 with respect to the first lens group 1 does not shift during camera shake correction.
- FIG. 7 is a vertical cross-sectional view illustrating an exemplary configuration of a main part of the camera module 53.
- the camera module 53 according to the fourth embodiment differs from the camera module 50 according to the first embodiment in the following points.
- the camera module 50 has an AF function.
- the camera module 53 further has an OIS function.
- the camera module 53 includes an actuator 20C, and the actuator 20C includes an OIS mechanism 23b. Further, the lower barrel 3b is fixed to the base 8 of the actuator 20C.
- the camera module 53 includes a first lens group 1, a second lens group 2, a barrel 3, an actuator 20 ⁇ / b> C, and an imaging unit 21.
- the first lens group 1, the second lens group 2, the barrel 3, and the imaging unit 21 have the same configuration as the camera module 50.
- the actuator 20C is different from the first embodiment. This is explained below.
- the actuator 20C is a device for displacing the first lens group 1 in the optical axis direction during focusing and displacing the first lens group 1 in a direction perpendicular to the optical axis during camera shake correction.
- the actuator 20C includes a holder 4, a coil 5, a magnet 6, a cover 16, a base 8, and an OIS mechanism 23b.
- the holder 4 is an annular member, and holds the upper barrel 3a with an inner peripheral wall.
- the holder 4 is supported so as to be displaceable in the optical axis direction with respect to an OIS mechanism 23b described later.
- the method for supporting the holder 4 is not particularly limited.
- a spring spring configured so that the spring constant in the direction perpendicular to the optical axis is significantly larger than the spring constant in the optical axis direction is used, and the upper and lower ends of the holder 4 are connected to the OIS mechanism 23b. It may be fixed.
- the cover 16 is formed in a shape surrounding the holder 4.
- An OIS coil (not shown) is fixed to the inner peripheral wall of the cover 16.
- the axis of the OIS coil is perpendicular to the optical axes of the first lens group 1 and the second lens group 2.
- the coil 5 is fixed by being wound around the outer periphery of the holder 4.
- the magnet 6 is fixed to the inner peripheral wall of the OIS mechanism 23b with a predetermined gap between it and the coil 5.
- the holder 4 when an electric current is passed through the coil 5, an electromagnetic force is generated between the coil 5 and the magnet 6. Therefore, when the electromagnetic force acts on the holder 4, the holder 4 is displaced in the optical axis direction together with the upper barrel 3 a and the first lens group 1. That is, the first lens group 1 can be displaced in the optical axis direction by passing a current through the coil 5.
- the base 8 has the same configuration as the camera module 50.
- the OIS mechanism 23b is, for example, a hollow member that is open at the top and bottom, and is disposed between the holder 4, the cover 16, and the base 8.
- a magnet 6 is fixed to the inner peripheral wall of the OIS mechanism 23b.
- an OIS magnet (not shown) is fixed to the outer peripheral wall of the OIS mechanism 23b with a predetermined gap so as to face the OIS coil.
- the OIS mechanism 23 b is supported so as to be displaceable in a direction perpendicular to the optical axis with respect to the base 8.
- the support method of OIS mechanism 23b is not specifically limited.
- the OIS mechanism 23b may be supported using a suspension wire.
- the OIS mechanism 23b when an electric current is passed through the OIS coil, an electromagnetic force is generated between the OIS coil and the OIS magnet.
- this electromagnetic force acts on the OIS mechanism 23b, the OIS mechanism 23b is integrated with the holder 4, the upper barrel 3a, and the first lens group 1 and is displaced in a direction perpendicular to the optical axis. That is, the first lens group 1 can be displaced in a direction perpendicular to the optical axis by passing a current through the OIS coil.
- the holder 4 and the coil 5 are displaced in the optical axis direction during focusing, and the magnet 6, the cover 16, the base 8, and the OIS mechanism 23b are not displaced during focusing. That is, the holder 4 and the coil 5 function as a focus movable part (movable part) that is displaced in the optical axis direction during focusing, and the magnet 6, the cover 16, the base 8, and the OIS mechanism 23b are focus fixing parts (non-displaceable during focusing). It functions as a movable part).
- the first lens group 1 fixed to the focus movable part is displaced in the optical axis direction during focusing.
- the second lens group 2 fixed to the focus fixing part is not displaced during focusing.
- the holder 4, the coil 5, the magnet 6 and the OIS mechanism 23b are displaced in the direction perpendicular to the optical axis when the camera shake is corrected, and the cover 16 and the base 8 are not displaced during the camera shake correction. That is, the holder 4, the coil 5, the magnet 6, and the OIS mechanism 23 b function as an OIS movable portion that is displaced during camera shake correction, and the cover 16 and the base 8 function as an OIS fixing portion that is not displaced during camera shake correction.
- the OIS mechanism 23b (camera shake correction mechanism) displaces the focus movable portion (movable portion) in a direction perpendicular to the optical axis with respect to the base 8 and the cover 16.
- the second lens group 2 is not displaced integrally with the first lens group 1 during camera shake correction. For this reason, the optical axis of the second lens group 2 that is not displaced in the direction perpendicular to the optical axis is shifted from the optical axis of the first lens group 1 that is displaced in the direction perpendicular to the optical axis due to camera shake correction. As a result, there is a possibility that a defect occurs in light collection, and it is conceivable that the image quality deteriorates.
- a lens having a large curvature is employed in the second lens group 2 to prevent image quality deterioration.
- the correction amount by the camera shake correction is an absolute value such as +/ ⁇ 0.1 mm, and by adopting a lens having a large curvature with respect to the first lens group 1 in the second lens group 2, the deviation of the optical axis is achieved.
- the sensitivity of the second lens group 2 with respect to the amount decreases. Thereby, the influence of the optical axis shift between the first lens group 1 and the second lens group 2 can be reduced.
- the setting of the curvature of the second lens group 2 is not particularly limited.
- the entire first lens group 1 is designed as a lens having negative power (concave type lens), and its power is increased as much as possible.
- the curvature of the second lens group 2 may be set larger than the curvature of the first lens group 1 by making the curvature as small as possible.
- the imaging module (camera modules 50, 51, 52, and 53) according to the first aspect of the present invention forms an image of light from a subject on the substrate (9) on which the imaging element (sensor chip 10) is mounted and the imaging element.
- An imaging module including a plurality of lenses (optical lenses 1a, 1b, and 2a) to be adjusted and a focus adjustment mechanism (actuators 20A, 20B, and 20C) that adjusts the focus of the plurality of lenses and is fixed to the substrate.
- the focus adjustment mechanism includes a movable part (holder 4 and coil 5) that is displaced in the direction of the optical axis of the plurality of lenses, and a non-movable part (magnet 6, yoke 7, base 8, and so on) that is not displaced in the direction of the optical axis.
- the first lens group (1) comprising two or more lenses selected from the plurality of lenses is movable, including an OIS mechanism 23a and an OIS mechanism 24b).
- a fixed, not included in the first lens group and the second lens group consisting of one or more lenses selected from the plurality of lenses (2) is fixed to the immovable part.
- the first lens group is fixed to the movable part, and the second lens group is fixed to the non-movable part that is not displaced in the direction of the optical axis of the focus adjustment mechanism. For this reason, the first lens group can be fixed to the movable portion after the second lens group is fixed to the non-movable portion. For this reason, the first lens group can be fixed to the movable portion after performing optical active alignment. Therefore, it is possible to prevent the occurrence of positional deviation and optical axis deviation that occur between the first lens group and the second lens group.
- a focus adjustment mechanism in which the positions of the first lens group and the second lens group are adjusted is fixed to the substrate. For this reason, the focus adjustment mechanism can be fixed to the substrate after the electrical active alignment is performed. Therefore, it is possible to prevent the occurrence of positional deviation and optical axis deviation between the image sensor mounted on the substrate and the first lens group and the second lens group.
- the first lens group and the second lens group can be positioned with high accuracy, and further, the first lens group, the second lens group, and the imaging device can be positioned with high accuracy.
- the lens and the image sensor can be positioned with high accuracy, it is possible to prevent the camera module from shading or blurring.
- the first lens group is fixed to the movable part that is displaced in the optical axis direction
- the second lens group is fixed to the non-movable part that is not displaced in the optical axis direction.
- the imaging module (camera module 50, 51, 52, 53) according to aspect 2 of the present invention is the above-described aspect 1, wherein the second lens group (2) includes the first lens group (1) and the imaging element ( An angle formed by light incident on the second lens group from the first lens group and light emitted from the second lens group to the image sensor; It may be larger than the angle formed by the optical axis.
- the second lens group is disposed between the first lens group and the image sensor. For this reason, generation
- the angle formed between the light incident from the first lens group to the second lens group and the optical axis is such that the light emitted from the second lens group to the image sensor and the optical axis It becomes larger than the angle formed by.
- the imaging module can reduce the stroke during focusing.
- Moving tilt generated by the focus adjustment mechanism is suppressed, and image quality degradation such as blurring is improved.
- the image quality of the image obtained at the time of macro is kept relatively good.
- the height of the imaging module can be reduced by the stroke amount that is reduced. (5) Power consumption during focusing can be reduced.
- the focus adjustment mechanism includes a contact portion that contacts the surface of the imaging element (sensor chip 10). Furthermore, you may provide.
- the contact portion of the focus adjustment mechanism and the image sensor are in contact. For this reason, the focus adjustment mechanism and the image sensor can be fixed with high accuracy without performing electrical active alignment.
- the imaging module (camera module 52) according to Aspect 4 of the present invention is the imaging module (Camera Module 52) according to any one of Aspects 1 to 3, wherein the movable part (holder 4 and coil 5) and the second lens group (2) are used as the optical axis.
- a camera shake correction mechanism (OIS mechanism 23a) that displaces in the vertical direction may be provided.
- the movable part to which the first lens group is fixed is displaced in the direction perpendicular to the optical axis together with the second lens group. For this reason, at the time of camera shake correction, the first lens group and the second lens group are displaced together, so that the optical axes of the first lens group and the second lens group do not shift.
- the imaging module (camera module 53) is the camera shake correction mechanism according to any one of the first to third aspects, wherein the movable part (the holder 4 and the coil 5) is displaced in a direction perpendicular to the optical axis.
- OIS mechanism 23b may be provided, and the lens of the second lens group (2) may have a larger curvature than the lens of the first lens group (1).
- the movable portion to which the first lens group is fixed is displaced in a direction perpendicular to the optical axis. For this reason, since only the first lens unit is displaced during focusing and camera shake correction, the movable weight during focusing and camera shake correction can be reduced. As a result, power consumption during focusing and camera shake correction can be suppressed.
- the manufacturing method of the imaging module (camera module 50 * 51 * 52 * 53) which concerns on aspect 6 of this invention is a manufacturing method of the imaging module which manufactures the imaging module of any one of the said aspects 1-5.
- a second lens group fixing step (step 1) for fixing the second lens group (2) to the non-movable part (magnet 6, yoke 7, base 8, OIS mechanism 23a, OIS mechanism 24b); By feeding back data of an image formed on the image sensor (sensor chip 10) by the one lens group (1) and the second lens group, the first lens group is moved to the movable portion (holder 4, coil 5).
- a first lens group adjustment step for performing active alignment (optical active alignment) for adjusting the position and angle fixed to A first lens group fixed step of the first lens group is fixed at the angle to the position of the movable portion (Step 2), may contain.
- the first lens group when the first lens group is fixed to the movable part after the second lens group is fixed to the non-movable part, it can be fixed after performing optical active alignment. Therefore, it is possible to prevent the occurrence of positional deviation and optical axis deviation that occur between the first lens group and the second lens group.
- the first lens group and the second lens group can be positioned with high accuracy.
- An imaging module manufacturing method is an imaging module manufacturing method for manufacturing the imaging module according to any one of aspects 1 to 5.
- the focus adjustment mechanism (actuators 20A, 20B, 20C) is fed back to the substrate (9) by feeding back the data of the images formed by the first lens group (1) and the second lens group (2).
- a focus adjustment mechanism adjustment step for performing an active alignment (electrical active alignment) for adjusting the position and angle fixed to the substrate), and a focus adjustment mechanism fixing for fixing the focus adjustment mechanism to the position on the substrate at the angle. Step (Step 3) may be included.
- the focus adjustment mechanism when the focus adjustment mechanism is fixed to the substrate, it can be fixed after performing electrical active alignment. For this reason, it is possible to prevent the occurrence of positional deviation and optical axis deviation between the imaging element mounted on the substrate and the first lens group and the second lens group.
- the first lens group, the second lens group, and the image sensor can be positioned with high accuracy.
- the manufacturing method of the imaging module (camera modules 50, 51, 52, and 53) according to Aspect 8 of the present invention is a manufacturing method of an imaging module that manufactures the imaging module according to any one of Aspects 1 to 5.
- the second lens group is fed back to the non-movable part (magnet 6, yoke 7, base 8, OIS mechanism 23a, OIS mechanism 24b) by feeding back the data of the image formed on the image sensor (sensor chip 10).
- a second lens group adjustment step for performing active alignment (optical active alignment) for adjusting the position and angle fixed to A second lens group fixed step of the second lens group is fixed at the angle to the position in the non-moving part (Step 2), may contain.
- the second lens group when the second lens group is fixed to the non-movable part after the first lens group is fixed to the movable part, it can be fixed after executing optical active alignment. Therefore, it is possible to prevent the occurrence of positional deviation and optical axis deviation that occur between the first lens group and the second lens group.
- the present invention can be widely applied in the field of using a solid-state imaging device and an imaging device including the same.
- the present invention relates to a compact imaging module that requires focus adjustment and is used in a portable device such as a mobile phone device with a camera or a portable terminal device (PDA), and is small in size, high in image quality, and low in power consumption. It can be used for conversion.
- a portable device such as a mobile phone device with a camera or a portable terminal device (PDA)
- PDA portable terminal device
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Abstract
Description
以下、本発明の実施形態1に係るカメラモジュール50(撮像モジュール)について、図1~図4に基づいて説明する。
図1は、カメラモジュール50の要部構成例を示す縦断面図である。カメラモジュール50は、被写体が無限遠方にある時や非常に近いマクロ位置にある時に、光学レンズの位置を光軸方向に変位させ、撮像面に結像された像のフォーカスを合わす動作(フォーカシング)を行う、オートフォーカス(AF:Auto Focus)機能付きの小型撮像モジュールである。
アクチュエータ20Aは、フォーカシング時に第1レンズ群1を光軸方向に変位させるための装置である。
撮像部21は、基板9、センサチップ10(撮像素子)、IRカットフィルタ12、および周辺部品13を備える。
カメラモジュール50は、上述したように、第1レンズ群1および第2レンズ群2を備える。また、第1レンズ群1は、フォーカス可動部に固定され、第2レンズ群2は、フォーカス固定部に固定されている。このため、カメラモジュール50はフォーカシング時の繰り出し量(ストローク)を小さくできる。詳しくは、図2および図3に基づき、下記に説明する。
次に、カメラモジュール50の製造方法として、カメラモジュール50を構成する、第1レンズ群1、第2レンズ群2、バレル3、アクチュエータ20A、および撮像部21の組立方法について図4に説明する。図4は、本発明の実施形態1におけるカメラモジュール50の生産ステップを説明する図である。なお、カメラモジュール50の上記各構成の製造方法については説明を省略する。
本発明の実施形態2に係るカメラモジュール51について、図5に基づいて説明する。なお、説明の便宜上、実施形態1にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。図5は、カメラモジュール51の要部構成例を示す縦断面図である。
図5に示すように、カメラモジュール51において、ベース8は、凸部8bの下端面の一部に、下方に突出するチップ当て部15を備える。チップ当て部15は光が入射するセンサチップ10の受光画素エリアを避け、周囲に四辺形に配置されるように形成されている。チップ当て部15の形状および数は特に限定されない。例えば、チップ当て部15は柱状に形成されてもよく、その数は3もしくは4が好ましいが、多数であってもよい。
本発明の実施形態3に係るカメラモジュール52について、図6に基づいて説明する。なお、説明の便宜上、実施形態1にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。図6は、カメラモジュール52の要部構成例を示す縦断面図である。
カメラモジュール52は、図6に示すように、第1レンズ群1、第2レンズ群2、バレル3、アクチュエータ20B、および撮像部21を備えている。第1レンズ群1、第2レンズ群2、および撮像部21に関しては、カメラモジュール50と同じ構成である。バレル3およびアクチュエータ20Bがカメラモジュール50と異なる。下記に説明する。
本発明の実施形態4に係るカメラモジュール53について、図7に基づいて説明する。
カメラモジュール53は、図7に示すように、第1レンズ群1、第2レンズ群2、バレル3、アクチュエータ20C、および撮像部21を備えている。第1レンズ群1、第2レンズ群2、バレル3および撮像部21に関しては、カメラモジュール50と同じ構成である。アクチュエータ20Cは実施形態1と異なる。下記に説明する。
本発明の態様1に係る撮像モジュール(カメラモジュール50・51・52・53)は、撮像素子(センサチップ10)が実装された基板(9)と、上記撮像素子に被写体からの光を結像させる複数のレンズ(光学レンズ1a・1b・2a)と、上記複数のレンズのフォーカスを調整し、かつ上記基板に固定されるフォーカス調整機構(アクチュエータ20A・20B・20C)とを備える撮像モジュールにおいて、上記フォーカス調整機構は、上記複数のレンズの光軸の方向に変位する可動部(ホルダ4、コイル5)と、上記光軸の方向に変位しない非可動部(マグネット6、ヨーク7、ベース8、OIS機構23a、OIS機構24b)とを備え、上記複数のレンズから選ばれる2つ以上のレンズからなる第1レンズ群(1)が上記可動部に固定され、上記第1レンズ群に含まれず、かつ上記複数のレンズから選ばれる1つ以上のレンズからなる第2レンズ群(2)が上記非可動部に固定されている。
1a・1b 光学レンズ(第レンズ)
2 第2レンズ群
2a 光学レンズ(レンズ)
3 バレル
3a 上部バレル
3b 下部バレル
4 ホルダ(可動部)
5 コイル(可動部)
6 マグネット(非可動部)
7 ヨーク(非可動部)
8 ベース(非可動部)
8b・8c 凸部
8d カバー部
9 基板
10 センサチップ(撮像素子)
15 チップ当て部(当接部)
16 カバー(非可動部)
20A・20B・20C アクチュエータ(フォーカス調整機構)
21 撮像部
22 合同レンズ群
23a OIS機構(手振れ補正機構、非可動部)
23b OIS機構(手振れ補正機構、非可動部)
50・51・52・53 カメラモジュール
Claims (6)
- 撮像素子が実装された基板と、
上記撮像素子に被写体からの光を結像させる複数のレンズと、
上記複数のレンズのフォーカスを調整し、かつ上記基板に固定されるフォーカス調整機構とを備える撮像モジュールにおいて、
上記フォーカス調整機構は、上記複数のレンズの光軸の方向に変位する可動部と、上記光軸の方向に変位しない非可動部とを備え、
上記複数のレンズから選ばれる2つ以上のレンズからなる第1レンズ群が上記可動部に固定され、上記第1レンズ群に含まれず、かつ上記複数のレンズから選ばれる1つ以上のレンズからなる第2レンズ群が上記非可動部に固定されていることを特徴とする撮像モジュール。 - 上記第2レンズ群は、上記第1レンズ群と上記撮像素子との間に配置され、
上記第1レンズ群から上記第2レンズ群へ入射する光と上記光軸とのなす角が、上記第2レンズ群から上記撮像素子へ出射する光と上記光軸とのなす角よりも大きくなることを特徴とする請求項1に記載の撮像モジュール。 - 上記フォーカス調整機構は、上記撮像素子の表面と当接する当接部をさらに備えていることを特徴とする請求項1または2に記載の撮像モジュール。
- 請求項1から3のいずれか1項に記載の撮像モジュールを製造する撮像モジュールの製造方法であって、
上記第2レンズ群を上記非可動部に固定する第2レンズ群固定ステップと、
上記第1レンズ群および上記第2レンズ群により上記撮像素子に結像された像のデータをフィードバックすることにより、上記第1レンズ群が上記可動部に固定される位置および角度を調整するアクテイブアライメントを実行する第1レンズ群調整ステップと、
上記第1レンズ群を上記可動部における上記位置に上記角度で固定する第1レンズ群固定ステップと、を含むことを特徴とする撮像モジュールの製造方法。 - 請求項1から3のいずれか1項に記載の撮像モジュールを製造する撮像モジュールの製造方法であって、
上記第1レンズ群および上記第2レンズ群により結像された像のデータをフィードバックすることにより、上記フォーカス調整機構が上記基板に固定される位置および角度を調整するアクテイブアライメントを実行するフォーカス調整機構調整ステップと、
上記フォーカス調整機構を上記基板における上記位置に上記角度で固定するフォーカス調整機構固定ステップと、を含むことを特徴とする撮像モジュールの製造方法。 - 請求項1から3のいずれか1項に記載の撮像モジュールを製造する撮像モジュールの製造方法であって、
上記第1レンズ群を上記可動部に固定する第1レンズ群固定ステップと、
上記第1レンズ群および上記第2レンズ群により上記撮像素子に結像された像のデータをフィードバックすることにより、上記第2レンズ群が上記非可動部に固定される位置および角度を調整するアクテイブアライメントを実行する第2レンズ群調整ステップと、
上記第2レンズ群を上記非可動部における上記位置に上記角度で固定する第2レンズ群固定ステップと、を含むことを特徴とする撮像モジュールの製造方法。
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