JP6148947B2 - Imaging module and manufacturing method thereof - Google Patents

Description

  The present invention relates to an imaging module and a manufacturing method thereof.

  In recent years, an example in which an imaging module having an autofocus function is mounted on an electronic device such as a mobile phone is increasing. There are various types of lens drive devices built into the imaging module, such as those that use stepping motors, those that use piezoelectric elements, and those that use VCM (Voice Coil Motor). ing.

  When a lens is fixed to such a lens driving device, it is necessary to accurately set an initial position in the optical axis direction of the lens with respect to the imaging surface of the imaging device.

  In a fixed focus type camera module that does not move the lens, it is possible to increase the accuracy of the initial position of the lens by directly attaching a lens holder that holds the lens to an image sensor unit that includes the image sensor.

  However, in a camera module equipped with an autofocus function that moves the lens in the optical axis direction by the lens driving device, the lens is attached to the lens driving device, and an assembly error of the lens driving device is added when setting the initial position of the lens. Is done. For this reason, initial focus adjustment is necessary to adjust this assembly error.

  In Patent Document 1, an imaging unit and an optical unit having a lens barrel that holds the imaging lens, a movable unit that holds the optical unit inside and is movable in the optical axis direction, and a fixed position that does not fluctuate when driving the imaging lens are disclosed. An imaging module including a lens driving device including a unit is described.

  Patent Document 1 describes that after an imaging module is assembled, the position of the imaging lens in the optical axis direction is adjusted by sliding the optical unit in the optical axis direction with respect to the movable part of the lens driving device. ing.

  Patent Document 2 describes an imaging module that includes an imaging lens and an optical unit having a lens barrel that holds the imaging lens, and a lens driving device that has a lens holder that is bonded and fixed to the lens barrel.

  In this imaging module, the lens barrel is slid with respect to the lens holder in the optical axis direction, the position of the lens barrel in the optical axis direction is adjusted, and then the lens barrel and the lens holder are bonded and fixed. .

JP 2010-230910 A JP 2012-256040 A

  The technologies described in Patent Documents 1 and 2 are based on the premise that the optical axis of the lens is perpendicular to the imaging surface of the imaging device. However, the optical axis of the lens may tilt without being perpendicular to the imaging surface of the imaging device due to an assembly error between the imaging device unit including the imaging device and the lens driving device.

  If the optical axis of the lens is not perpendicular to the imaging surface of the imaging device, for example, in the captured image, the right end is blurred, but the left end is out of focus, so that the area is blurred for each region in the image. A different phenomenon will occur.

  If the number of pixels of the image sensor is small, the effect of this phenomenon on the image quality can be ignored. However, since recent imaging modules have been downsized and the number of pixels of the imaging device has been increased, the influence on the imaging quality due to the above phenomenon cannot be ignored.

  The present invention has been made in view of the above circumstances, and an imaging module capable of improving imaging quality by preventing the imaging surface of the imaging element and the optical axis of the lens from becoming non-perpendicular and a method for manufacturing the imaging module The purpose is to provide.

An imaging module of the present invention includes: a lens unit having a lens unit; and an imaging device unit including an imaging device that is fixed to the lens unit and captures a subject image through the lens unit, and the lens unit includes the lens A lens holding portion that holds the moving portion, a movable portion that is fixed to the lens holding portion and is movable in one direction with respect to the imaging surface of the imaging element, and drives the movable portion in the one direction. Driving section, a guide section provided in the lens holding section and a contact section provided in a portion of the movable section facing the guide section, and a guide section provided in contact with the guide section, or a guide provided in the movable section And a contact portion that is provided on a portion of the lens holding portion facing the guide portion and that contacts the guide portion, and the contact portion is provided outside the inner diameter of the movable portion. Is, the surface of the guide portion the abutting portion abuts, is constituted by a surface inclination of the optical axis of the lens portion is determined with respect to the movement direction of the movable portion in accordance with the contact portion of the contact portion It is what.

An image pickup module manufacturing method of the present invention includes a lens unit having a lens unit, and an image sensor unit that is fixed to the lens unit and includes an image sensor that captures a subject image through the lens unit. A lens holding unit that holds the lens unit, a movable unit that is fixed to the lens holding unit and is movable in one direction with respect to the imaging surface of the imaging element, and the movable unit is A driving portion that drives in the direction, a guide portion provided in the lens holding portion, and a contact portion provided in a portion of the movable portion that faces the guide portion, or a contact portion that contacts the guide portion, or provided in the movable portion. And a contact portion provided on a portion of the lens holding portion facing the guide portion, the contact portion contacting the guide portion, wherein the contact portion is formed from an inner diameter of the movable portion. The surface of the guide portion that is provided on the outer side and is in contact with the contact portion is a surface that determines the inclination of the lens portion in the optical axis direction with respect to the moving direction of the movable portion in accordance with the contact portion of the contact portion. A method of manufacturing an imaging module, wherein the lens holding unit is moved relative to the movable unit according to the guide unit, and a direction perpendicular to an imaging surface of the imaging element and an optical axis of the lens unit A step of matching the direction, and a step of fixing the lens holding portion to the movable portion with an adhesive after the matching step.

  ADVANTAGE OF THE INVENTION According to this invention, the imaging module which can prevent that the imaging surface of an image sensor and the optical axis of a lens become non-perpendicular, and can improve imaging quality, and its manufacturing method can be provided.

It is a cross-sectional schematic diagram which shows the cross section containing the optical axis of the imaging module 100 which is one Embodiment of this invention. It is a disassembled perspective view of the lens barrel 13 and the movable part 14 of the imaging module 100 shown in FIG. It is the perspective view which looked at the lens barrel 13 shown in FIG. 2 from the movable part 14 side. It is the front view which looked at the lens barrel 13 shown in FIG. 2 from the movable part 14 side. It is a figure for demonstrating the attitude | position adjustment state of the lens barrel 13 at the time of manufacture of the imaging module 100 shown in FIG. It is a perspective view which shows the movable part 140 which is a modification of the movable part 14 of the imaging module 100 shown in FIG. It is a cross-sectional schematic diagram which shows the cross section containing the optical axis Ax of the imaging module 200 which is a modification of the imaging module 100 shown in FIG. It is a disassembled perspective view when the movable part 34 of the imaging module 200 shown in FIG. 7, the voice coil 15, and the lens barrel 33 are seen from the to-be-photographed object side. It is a perspective view when the movable part 34 of the image pick-up module 200 shown in FIG. 7 is seen from the image pick-up element 24 side. It is a cross-sectional schematic diagram which shows the cross section containing the optical axis Ax of the imaging module 300 which is a modification of the imaging module 100 shown in FIG. It is a disassembled perspective view when the movable part 44 of the imaging module 300 shown in FIG. 10, the voice coil 15, and the lens barrel 43 are seen from the to-be-photographed object side. It is a perspective view when the movable part 44 of the image pick-up module 300 shown in FIG. 10 is seen from the image pick-up element 24 side. 3 is a flowchart for explaining a manufacturing process of the imaging module 100 shown in FIG. 1.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view showing a cross section including an optical axis Ax of an imaging module 100 according to an embodiment of the present invention.

  The imaging module 100 includes a lens unit 10 having a lens group 12 as a lens unit, and an imaging element unit 20 having an imaging element 24 that is fixed to the lens unit 10 and images a subject through the lens group 12.

  The image sensor unit 20 includes an image sensor 24 such as a CCD image sensor or a CMOS image sensor, a substrate 21 to which the image sensor 24 is fixed, a cover holder 22 provided on the substrate 21 so as to surround the image sensor 24, a cover A cover glass 23 fitted in the holder 22.

  The lens unit 10 includes a lens group 12 including at least one (three in the example of FIG. 1, 12 a to 12 c) imaging lens, a cylindrical lens barrel 13 as a lens holding unit that holds the lens group 12, and The image sensor unit 20 includes a cover holder 22, a bottom block 18, and a lens driving device 19, which are accommodated in the housing 11.

  The lens driving device 19 includes a movable portion 14, a voice coil 15, a magnet 16, and a holder 17.

  The movable part 14 is a cylindrical member fixed to the lens barrel 13, and a part of the lens barrel 13 is inserted into the hollow part.

  The voice coil 15 is fixed to the outer periphery of the movable portion 14 so that a current can flow from outside.

  The magnet 16 is disposed to face the voice coil 15 and is supported by the holder 17. The holder 17 is fixed to the housing 11.

  The lens driving device 19 moves the voice coil 15 by passing an electric current through the voice coil 15, and the movable part 14 integrated with the voice coil 15 and the lens barrel 13 integrated with the movable part 14 are connected to the imaging element. The actuator is driven in one direction intersecting the 24 imaging planes (in an ideal state where there is no manufacturing error or assembly error, the direction is orthogonal to the imaging plane).

  That is, the voice coil 15 and the magnet 16 constitute a drive unit that drives the movable unit 14 in the one direction.

  The configuration of the drive unit is not limited to a configuration using a voice coil motor, and the movable unit 14 may be driven using, for example, a stepping motor or a piezoelectric element.

  FIG. 2 is an exploded perspective view of the lens barrel 13 and the movable portion 14 of the imaging module 100 shown in FIG. 1 when viewed from the subject side. FIG. 3 is a perspective view of the lens barrel 13 shown in FIG. 2 as viewed from the movable portion 14 side. FIG. 4 is a front view of the lens barrel 13 shown in FIG. 2 as viewed from the movable portion 14 side.

  As shown in FIGS. 2 and 3, the lens barrel 13 includes a small diameter portion 130 and a large diameter portion 131.

  The small diameter portion 130 is a cylindrical member, and holds the lens group 12 therein.

  The large diameter portion 131 has a length in the direction orthogonal to the optical axis of the lens group 12 larger than that of the small diameter portion 130. An opening is formed at the center of the large-diameter portion 131, and the lens 12 a closest to the subject among the lenses of the lens group 12 is exposed from the opening.

  Two pairs of notch portions (notch portions) arranged side by side in a direction perpendicular to the optical axis direction across the optical axis Ax of the lens group 12 are disposed at the end of the large diameter portion 131 on the subject side in the optical axis direction. Part 131A, 131C and notch 131B, 131D).

  The arrangement direction of the notches 131A and 131C is orthogonal to the arrangement direction of the notches 131B and 131D.

  A through hole K is formed in each of the cutout portions 131B, 131C, and 131D, and this through hole serves as an adhesive pool when the lens barrel 13 and the movable portion 14 are bonded.

  An end surface 131a on the image sensor 24 side in the optical axis direction of the large diameter portion 131 is a surface perpendicular to the optical axis Ax, and three convex portions 131b are formed on the end surface 131a (FIGS. 3 and 4). reference).

  As shown in FIG. 4, the three convex portions 131 b are arranged at intervals along the outer periphery of the small diameter portion 130. It is preferable that the intervals between the three convex portions 131b are equal. Each of the three convex portions 131b is a curved surface. For example, the three convex portions 131b are each hemispherical.

  The movable portion 14 is formed of a cylindrical member, and the diameter of the hollow portion is larger than the length of the small diameter portion 130 of the lens barrel 13 in the direction perpendicular to the optical axis direction, and the optical axis of the large diameter portion 131 of the lens barrel 13. It is smaller than the length in the direction orthogonal to the direction.

  The movable portion 14 has a stepped structure in which the length in the direction orthogonal to the moving direction is increased at the subject side end portion (hereinafter referred to as the tip portion) in the moving direction.

  The outer peripheral surface of the distal end portion of the movable portion 14 includes a ring-shaped plane 14A perpendicular to the moving direction of the movable portion 14 and a cylindrical surface 14C.

  When viewed from the subject side, the outer diameter of the flat surface 14A is smaller than the outer diameter of the cylindrical surface 14C.

  The outer peripheral surface of the distal end portion of the movable portion 14 further includes a slope 14B that is a surface connecting the flat surface 14A and the cylindrical surface 14C and is inclined in a direction that is not perpendicular to the moving direction (see FIGS. 1 and 2).

  In a state where the small diameter portion 130 of the lens barrel 13 is inserted into the hollow portion of the movable portion 14, each of the three convex portions 131 b illustrated in FIG. 4 abuts on the inclined surface 14 </ b> B of the movable portion 14.

  The convex portion 131b is a curved surface, and the inclined surface 14B that contacts the convex portion 131b is an inclined surface. For this reason, in a state before the lens barrel 13 and the movable portion 14 are bonded and fixed, by applying force to the movable portion 14 side with respect to any of the cutout portions 131A to 131D of the lens barrel 13, the contact with the inclined surface 14B is achieved. The contact location of the projecting portion 131b in contact can be changed. As a result, the relative posture between the lens barrel 13 and the movable portion 14 can be changed.

  Thus, the slope 14B of the movable portion 14 functions as a guide portion that guides the posture of the lens barrel 13 so that the posture of the lens barrel 13 with respect to the movable portion 14 can be changed.

  The guide part (inclined surface 14B) and the contact part (three convex parts 131b) are in contact with each other, and the optical axis Ax is movable around an arbitrary point on the optical axis Ax of the lens group 12 as a tilting center. It is configured to be tiltable with respect to the moving direction of the portion 14. In the example of FIG. 1, this arbitrary point is designed to be on the imaging surface 24 a of the imaging device 24.

  Note that it is conceivable that the positional relationship between the optical axis Ax and the imaging surface 24a changes due to assembly errors and manufacturing errors. For this reason, the arbitrary point in the actual product may slightly deviate from the imaging surface 24a. In this case, however, the arbitrary point is treated as being substantially on the imaging surface 24a.

  As described above, the imaging module 100 includes the guide portion (slope 14B) and the abutting portions (three convex portions 131b) that abut on the guide portion, so that the attitude of the lens barrel 13 with respect to the movable portion 14 during the manufacture thereof. Can be changed.

  In the imaging module 100, after the structural members other than the lens barrel 13 holding the lens group 12 are assembled, the lens barrel 13 is inserted into the hollow portion of the movable portion 14.

  In this state, as described above, each of the three convex portions 131b shown in FIG. 4 abuts on the inclined surface 14B of the movable portion 14, and the posture of the lens barrel 13 relative to the movable portion 14 can be changed.

  If there is an assembly error or a component manufacturing error in the steps so far, for example, the moving direction of the movable portion 14 is not perpendicular to the imaging surface 24a of the imaging element 24, and the optical axis Ax and the imaging surface 24a are perpendicular. It may not be.

  In addition, although the moving direction of the movable portion 14 is perpendicular to the imaging surface 24a, the optical axis of the lens group 12 with respect to the moving direction of the movable portion 14 due to manufacturing errors between the movable portion 14 and the lens barrel 13. The direction is inclined, and the optical axis Ax and the imaging surface 24a may not be perpendicular.

  The manufacturing apparatus for manufacturing the imaging module 100 inserts the small-diameter portion 130 of the lens barrel 13 into the hollow portion of the movable portion 14, and then changes the posture of the lens barrel 13 according to the inclined surface 14 </ b> B that is the guide portion. The posture of the lens barrel 13 is adjusted so that the optical axis Ax of the lens and the imaging surface 24a are perpendicular to each other.

  Specifically, the notch 131A and the notch 131C are grasped from both sides by a small arm provided in the manufacturing apparatus, and the notch 131B and the notch 131D are grasped from both sides by another small arm.

  By operating these arms, one of the two cutout portions is pushed into the movable portion 14 side, and the other is pulled up toward the subject, thereby changing the posture of the lens barrel 13 relative to the movable portion 14.

  For example, as shown in FIG. 5, when the imaging surface 24a of the imaging device 24 is inclined and the imaging surface 24a is non-perpendicular to the moving direction of the movable portion 14, as indicated by the black arrow. The imaging surface 24a and the optical axis Ax of the lens group 12 can be made vertical by performing an operation of pushing down the cutout portion 131A and pushing up the cutout portion 131C.

  The manufacturing apparatus adjusts the lens barrel 13 so that the optical axis Ax of the lens group 12 and the imaging surface 24a are perpendicular to each other, and then fixes the lens barrel 13 and the movable portion 14 while maintaining the adjusted posture.

  For example, the lens barrel 13 and the movable portion 14 are bonded and fixed by injecting an adhesive into the through hole K formed in the lens barrel 13 and curing it.

  Thus, according to the imaging module 100, the optical axis Ax of the lens group 12 and the imaging surface 24a can be made vertical due to the presence of the guide portion and the abutting portion that abuts on the guide portion. The error can be absorbed to prevent the degradation of the image quality.

  The arbitrary point that is the center of tilting of the optical axis Ax may be a point on the optical axis between the imaging surface 24a and the lens barrel 13, or may be a point closer to the substrate 21 than the imaging surface 24a. .

  As described above, if the arbitrary point is located on the imaging element 24 side with respect to the lens barrel 13, the design of the guide portion is facilitated, and the manufacturing cost of the imaging module 100 can be reduced.

  If the arbitrary point is on the image pickup surface 24a of the image pickup device 24 as shown in FIG. 1, the deviation between the optical axis Ax and the center of the image pickup surface 24a accompanying the change in the attitude of the lens barrel 13 can be minimized. Therefore, it is particularly preferable.

  Further, in the large-diameter portion 131 of the lens barrel 13, a configuration in which a hole is provided adjacent to the notches 131A to 131D and this hole is used as an adhesion pool is also conceivable. However, the notches 131A to 131D are adhered and accumulated. According to the configuration, the manufacturing cost can be reduced because there is no need to provide a hole.

  Up to this point, three convex portions 131b are provided on the surface 131a of the lens barrel 13, but three or more convex portions 131b may be provided. For example, when there are four convex portions 131b provided on the surface 131a of the lens barrel 13, each convex portion 131b can be disposed adjacent to the notches 131A to 131D.

  According to such an arrangement, when the cutout portions 131A to 131D are used as an adhesion pool, it is possible to perform adhesion near the contact region between the convex portion 131b and the inclined surface 14B, and the lens barrel 13 and the movable portion. 14 can be stably fixed.

  FIG. 6 is a perspective view showing a movable portion 140 that is a modification of the movable portion 14 of the imaging module 100 shown in FIG. FIG. 6 is a perspective view of the movable part 140 viewed from the same direction as the movable part 14 of FIG.

  The movable part 140 is different from the movable part 14 in that the slope functioning as a guide part is composed of a plurality of slopes whose positions in the moving direction of the movable part 140 are different. Details will be described below.

  The slope that functions as the guide part of the movable part 140 is composed of three slopes 14a, three slopes 14b, and three slopes 14c.

  The position of the slope 14a in the movement direction of the movable part 140 is the same as the position of the slope 14B in FIG. 2 in the movement direction of the movable part 14.

  The inclined surface 14b is located closer to the imaging element 24 than the inclined surface 14a in the moving direction of the movable portion 140.

  The slope 14c is located closer to the image sensor 24 than the slope 14b in the moving direction of the movable portion 140.

  The three slopes 14a are preferably arranged at equal distances on the circumference when the movable part 140 is viewed from the subject side.

  The three inclined surfaces 14b are preferably arranged at equal distances on the circumference when the movable part 140 is viewed from the subject side.

  The three inclined surfaces 14c are preferably arranged at equal distances on the circumference when the movable part 140 is viewed from the subject side.

  In the imaging module 100 equipped with the movable portion 140, the small-diameter portion 130 of the lens barrel 13 is inserted into the hollow portion of the movable portion 140 so that the three convex portions 131b are in contact with the inclined surface 14a, for example, and then the lens barrel 13 is mounted. By rotating clockwise around the optical axis Ax, the guide part of the movable part 140 brought into contact with the three convex parts 131b can be switched in the order of the slope 14c and the slope 14b.

  In this manner, by making it possible to select from among the three guide portions of the movable portion 140 that is brought into contact with the three convex portions 131b, the distance between the lens group 12 and the image sensor 24 can be changed in three stages.

  For this reason, even when the configuration of the lens group 12 and the configuration of the image sensor 24 change depending on the model of the imaging module, and the distance adjustment between the lens group 12 and the image sensor 24 is necessary, this can be easily handled.

  Therefore, it is not necessary to make the structure of the movable part 140 and the lens barrel 13 different for each model, and the manufacturing cost can be reduced.

  Here, an example has been described in which the movable portion 140 is provided with three guide portions having different positions in the moving direction of the movable portion 140. However, if there are two or more types of guide portions, the above-described effects can be obtained.

  In FIG. 1, the guide barrel and the contact portion are configured so that the posture of the lens barrel 13 can be changed with the point on the image pickup device 24 side of the lens barrel 13 on the optical axis Ax of the lens group 12 as the tilting center. It was.

  On the other hand, the posture of the lens barrel 13 may be configured so that the guide portion and the contact portion are tilted at a point closer to the subject side than the lens barrel 13 on the optical axis Ax of the lens group 12. . Hereinafter, this configuration will be described.

  FIG. 7 is a schematic cross-sectional view showing a cross section including an optical axis Ax of an imaging module 200 which is a modification of the imaging module 100 shown in FIG. FIG. 8 is an exploded perspective view of the movable part 34, the voice coil 15, and the lens barrel 33 of the imaging module 200 as viewed from the subject side. FIG. 9 is a perspective view when the movable portion 34 is viewed from the image sensor 24 side.

  The imaging module 200 has substantially the same configuration as the imaging module 100 except that the lens barrel 13 is changed to the lens barrel 33 and the movable portion 14 is changed to the movable portion 34. For this reason, below, only the structure of the lens barrel 33 and the movable part 34 is demonstrated.

  The movable portion 34 is provided with four notches 34D (see FIG. 8) arranged at equal intervals on the circumference at the end of the movable portion 14 in FIG. 1 on the image sensor 24 side. It is the structure which turned upside down the movable part 14 to have.

  That is, the movable part 34 is configured to have a slope 14B as a guide part at the end on the image sensor 24 side in the moving direction.

  The lens barrel 33 includes a small-diameter portion 330 that holds the lens group 12 therein, and a large-diameter portion 331 that has the same inner diameter as the small-diameter portion 330 but has an outer diameter larger than that of the small-diameter portion 330.

  The outer diameter of the small diameter portion 330 is smaller than the inner diameter of the movable portion 34, and the small diameter portion 330 is inserted into the hollow portion of the movable portion 34.

  The large diameter portion 331 is provided on the image sensor 24 side in the optical axis Ax direction of the small diameter portion 330. A subject-side surface 331a of the large-diameter portion 331 is a plane perpendicular to the optical axis Ax, and three convex portions 331b are formed on the surface 331a.

  The three convex portions 331b are arranged at equal intervals on the circumference of a circle centered on the optical axis Ax.

  The inclined surface 14B and the three convex portions 331b are arranged such that the small diameter portion 330 of the lens barrel 33 is inserted into the hollow portion of the movable portion 34 and the inclined surface 14B and the three convex portions 331b are in contact with each other. The optical axis of the lens group 12 is configured to be tiltable with respect to the moving direction of the movable unit 34, with a point closer to the subject than 33 as the center of tilting.

  Two pairs of notch portions arranged in a direction orthogonal to the optical axis direction across the optical axis Ax (a pair of the notch portions 330A and 330C and a notch portion 330B and 330D) are arranged on the subject side end of the small diameter portion 330. Set).

  The arrangement direction of the cutout portions 330A and 330C and the arrangement direction of the cutout portions 330B and 330D are orthogonal to each other.

  Further, at the subject side end of the small diameter portion 330, an adhesive margin 330E is provided between the cutout portions. The four bonding margins 330E are arranged at equal intervals on the circumference of a circle centered on the optical axis Ax.

  When the imaging module 200 is manufactured, the small diameter portion 330 of the lens barrel 33 is inserted into the hollow portion of the movable portion 34. At this time, the small diameter portion 330 of the lens barrel 33 is inserted into the hollow portion of the movable portion 34 so that one bonding margin 330E of the lens barrel 33 is close to one notch portion 34D of the movable portion 34.

  In this state, the manufacturing apparatus applies a force to the notches 330A to 330D at the subject side end of the lens barrel 33 using the arm, so that the posture of the lens barrel 33 is changed according to the inclined surface 14B as the guide portion. The posture of the lens barrel 33 is adjusted so that the optical axis of the lens group 12 and the imaging surface 24a are perpendicular to each other.

  Thereafter, the manufacturing apparatus applies the adhesive across the notch portion 34D and the margin 330E in a state where the lens barrel 13 is maintained in the adjusted posture, and cures the lens barrel 33 and the movable portion 34. To fix.

  As described above, even if the three convex portions as the contact portions are provided at the end of the lens barrel 33 on the image sensor 24 side, the optical axis of the lens group 12 and the imaging surface 24a are made vertical. It is possible to absorb manufacturing errors and assembly errors, and to prevent deterioration in image quality.

  FIG. 10 is a schematic cross-sectional view showing a cross section including an optical axis Ax of an imaging module 300 which is a modification of the imaging module 100 shown in FIG. FIG. 11 is an exploded perspective view of the movable portion 44, the voice coil 15, and the lens barrel 43 of the imaging module 300 as viewed from the subject side. FIG. 12 is a perspective view when the movable portion 44 is viewed from the image sensor 24 side.

  The imaging module 300 has substantially the same configuration as that of the imaging module 100 except that the lens barrel 13 is changed to the lens barrel 43 and the movable portion 14 is changed to the movable portion 44. Only the configuration of the barrel 43 and the movable portion 44 will be described.

  The movable portion 44 changes the end surface of the movable portion 34 in FIG. 7 on the image sensor 24 side to a plane 441a perpendicular to the moving direction of the movable portion 34 (see FIG. 12), and this plane 441a is as shown in FIG. In addition, three convex portions 441b arranged at equal intervals on the circumference are provided.

  The lens barrel 43 is obtained by changing the large diameter portion 331 in the lens barrel 33 of FIG.

  The large diameter portion 431 has a surface 431 </ b> A that can be seen from the subject side as an inclined surface that comes into contact with the three convex portions 431 b of the movable portion 44. The surface 431A is a surface inclined in a direction non-perpendicular to the moving direction of the movable portion 44, and functions as the guide portion described above.

  The inclined surface 431A and the three convex portions 441b are arranged such that the small diameter portion 330 of the lens barrel 43 is inserted into the hollow portion of the movable portion 44 and the inclined surface 431A and the three convex portions 441b are in contact with each other. The optical axis of the lens group 12 is configured to be tiltable with respect to the moving direction of the movable portion 44 with the point closer to the subject than 43 as the center of tilting.

  The imaging module 300 inserts the small diameter portion 330 of the lens barrel 43 into the hollow portion of the movable portion 44 at the time of manufacture. At this time, the small diameter portion 330 of the lens barrel 43 is inserted into the hollow portion of the movable portion 44 so that one bonding margin 330E of the lens barrel 43 is close to one notch portion 34D of the movable portion 44.

  In this state, the manufacturing apparatus applies the force to the notch portions 330A to 330D at the subject side end portion of the lens barrel 43 using the arm, so that the posture of the lens barrel 43 is changed according to the inclined surface 431A as the guide portion. The posture of the lens barrel 43 is adjusted so that the optical axis of the lens group 12 and the imaging surface 24a are perpendicular to each other.

  Thereafter, in a state where the lens barrel 43 is maintained in the adjusted posture, the manufacturing apparatus applies an adhesive across the notch portion 34D and the margin 330E, and cures the lens barrel 43 and the movable portion 44. To fix.

  As described above, even when the movable portion 44 is provided with the three convex portions 441b as the contact portions and the lens barrel 43 is provided with the inclined surface 431A as the guide portion, the optical axis of the lens group 12 and the imaging are also obtained. The surface 24a can be made vertical, and manufacturing errors and assembly errors can be absorbed to prevent degradation of image quality.

  Note that the imaging module 100 in FIG. 1 may have a configuration in which the subject-side end surface of the movable portion 14 is entirely inclined 14B.

  In the imaging module 100 of FIG. 1, the subject-side end surface of the movable portion 14 is all a flat surface 14A, and three convex portions as contact portions are arranged on the flat surface 14A, and the large-diameter portion 131 of the lens barrel 13 is It is good also as a structure which formed the slope as a guide part contact | abutted with these three convex parts.

  Even in this configuration, since the posture of the lens barrel 13 can be changed according to the guide portion, it is possible to prevent deterioration in image quality.

  Up to this point, an inclined surface is taken as an example of the guide portion, and three convex portions are taken as an example of the contact portion that comes into contact with the guide portion. As a modified example, the guide portion may be a curved surface.

  That is, if the guide portion is a slope or a curved surface and a contact portion that contacts the guide portion at a point is provided, the posture of the lens barrel can be changed with respect to the movable portion.

  When the abutting portion that abuts on the guide portion at a point is adopted, at least three points are necessary as the abutting points on the guide portion. By contacting the guide portion at at least three points, the posture of the lens barrel can be stably guided.

  All the guide portions described above are provided outside the hollow portion of the cylindrical movable portion. By doing in this way, design of a guide part and a contact part becomes easy.

  Finally, the manufacturing process of the imaging module having the above configuration will be described.

  FIG. 13 is a flowchart for explaining a manufacturing process of the imaging module 100 shown in FIG.

  After the image sensor unit 20 is bonded and fixed to the part other than the lens barrel 13 of the lens unit 10, the image pickup module manufacturing apparatus directs the opening of the housing 11 toward the chart surface on a line perpendicular to the chart surface of the measurement chart. The imaging module being manufactured is held (step S1).

  In this state, the lens barrel 13 containing the lens group 12 is inserted from the opening of the housing 11 to obtain the state shown in FIG. 1 (step S2).

  The imaging module manufacturing apparatus causes the imaging chart 24 to image the measurement chart in the state shown in FIG. 1 (step S3).

  The imaging module manufacturing apparatus determines whether or not the imaging surface of the imaging element 24 and the optical axis of the lens group 12 are perpendicular based on the captured image obtained by imaging with the imaging element 24 (step S4). ).

  When the determination in step S4 is NO, the imaging module manufacturing apparatus obtains how much the angle formed by the imaging surface and the optical axis is deviated from a right angle, and the notch portion of the lens barrel 13 corresponding to the deviated angle. 131A to 131D are gripped by the arm, and the inclination of the lens barrel 13 is adjusted according to the guide portion (step S5).

  The imaging module manufacturing apparatus performs step S3 again after step S5.

  When the determination in Step S4 is YES, the imaging module manufacturing apparatus adheres and fixes the lens barrel 13 and the movable portion 14 (Step S6).

  As described above, the following items are disclosed in this specification.

  The disclosed imaging module includes: a lens unit having a lens unit; and an imaging device unit that is fixed to the lens unit and includes an imaging device that captures a subject image through the lens unit, and the lens unit includes the lens A lens holding portion that holds the moving portion, a movable portion that is fixed to the lens holding portion and is movable in one direction with respect to the imaging surface of the imaging element, and drives the movable portion in the one direction. A driving unit, a guide unit provided in the lens holding unit, and a contact unit provided in a portion of the movable unit that faces the other guide unit, and a contact unit that contacts the guide unit, or provided in the movable unit. And a contact portion provided on a portion of the lens holding portion facing the guide portion, the contact portion contacting the guide portion, wherein the contact portion is smaller than the inner diameter of the movable portion. Those provided on the side.

  With this configuration, since the posture of the lens holding unit can be adjusted by the guide unit at the time of manufacture, it is possible to prevent image quality deterioration by making the imaging surface of the imaging device and the optical axis of the lens unit perpendicular to each other. .

  In the disclosed imaging module, the guide portion is configured by a curved surface or a slope inclined in a direction non-perpendicular to the one direction.

  With this configuration, it is possible to stably guide the posture of the lens holding portion during manufacturing.

  In the disclosed imaging module, the guide unit is configured by a plurality of curved surfaces or the inclined surfaces having different positions in the optical axis direction of the lens unit, and the abutting unit is configured with respect to the curved surface or the inclined surface having the same position. It is what comes into contact.

  With this configuration, it is easy to adjust the distance between the lens unit and the image sensor at the time of manufacturing, and the lens holding unit and the movable unit do not have to be configured differently for each model of the imaging module, so that the manufacturing cost can be reduced.

  In the disclosed imaging module, the guide portion and the contact portion are configured so that the optical axis can be tilted about an arbitrary point on the optical axis of the lens portion as a tilt center.

  With this configuration, it is possible to suppress the influence on the image quality due to the posture change of the lens holding unit.

  In the disclosed imaging module, an arbitrary point on the optical axis is outside the lens holding portion.

  With this configuration, it is easy to change the posture of the lens holding portion during manufacturing.

  In the disclosed imaging module, an arbitrary point on the optical axis is closer to the imaging element than the lens holding portion.

  With this configuration, it is possible to further suppress the influence on the image quality due to the change in the attitude of the lens holding unit.

  In the disclosed imaging module, an arbitrary point on the optical axis is on the imaging surface of the imaging element.

  With this configuration, it is possible to minimize the influence on the image quality due to the posture change of the lens holding unit.

  In the disclosed imaging module, the contact portion is provided on the subject side of the lens holding portion.

  With this configuration, it is easy to change the posture of the lens holding portion during manufacturing, and the manufacturing cost can be reduced.

In the disclosed imaging module, the lens holding portion has a first portion inserted into the hollow portion of the cylindrical member, and a length in a direction perpendicular to the optical axis direction outside the hollow portion. The hollow portion is composed of a second portion larger than the length in the direction orthogonal to the one direction,
The guide part is provided between the second part and the movable part.

  With this configuration, the movable part is arranged at the time of manufacturing, and then the lens holding part is inserted into the hollow part of the moving part. In this state, the posture of the lens holding part can be changed. Cost can be reduced.

  The disclosed imaging module is disposed at an end of the lens holding unit on the subject side in the optical axis direction in a direction orthogonal to the optical axis direction with the optical axis of the lens unit sandwiched when viewed from the subject side. At least one pair of notched portions is provided.

  With this configuration, the posture of the lens holding portion can be easily changed using the cutout portion during manufacturing.

  In the disclosed imaging module, the contact portion is provided on the subject side of the lens holding portion, and the pair of notch portions is provided at the subject side end portion of the lens holding portion in the optical axis direction. Two sets are provided, and the notch portion is an adhesive pool in which an adhesive for adhering the lens holding portion and the movable portion is accumulated, and the notch portion and the contact portion are adjacent to each other. is there.

  With this configuration, an adhesive can be applied in the vicinity of the contact area between the contact portion and the guide portion at the time of manufacture, and stable adhesion becomes possible.

  In the disclosed imaging module, two sets of the pair of cutout portions are provided at an end of the lens holding portion in the optical axis direction on the subject side, and the pair of cutouts in one of the two sets is provided. The direction in which the parts are arranged and the direction in which the pair of cutout parts in the other of the two sets are arranged are orthogonal to each other.

  With this configuration, the lens holding portion can be changed to more postures using the cutout portion at the time of manufacturing. In addition, posture control becomes easy.

  In the disclosed imaging module, the cutout portion is an adhesion pool in which an adhesive that adheres the lens holding portion and the movable portion is accumulated.

  With this configuration, it is not necessary to provide a separate adhesive pool, so that the manufacturing cost can be reduced.

  The disclosed imaging module includes one in which the abutting portion abuts on the guide portion at three or more points.

  With this configuration, the lens holding portion can be stably guided.

  The disclosed method of manufacturing an imaging module is a method of manufacturing the imaging module, wherein the lens holding unit is moved with respect to the movable unit according to the guide unit, and the direction perpendicular to the imaging surface of the imaging device And the step of matching the optical axis direction of the lens portion, and the step of fixing the lens holding portion to the movable portion with an adhesive after the matching step.

  By this method, it is possible to manufacture an image pickup module in which the image pickup surface of the image pickup element and the optical axis of the lens unit are perpendicular to each other to prevent deterioration in image pickup image quality.

  The present invention is particularly convenient and effective when applied to an imaging module mounted on a portable terminal such as a cellular phone, an eyeglass-type electronic device, a wristwatch-type electronic device, or the like.

DESCRIPTION OF SYMBOLS 100 Imaging module 10 Lens unit 11 Case 12 Lens group (lens part)
13 Lens barrel (lens holder)
131b Convex part (contact part)
14 Movable part 14B Slope (guide part)
15 Voice coil 16 Magnet 17 Holder 18 Bottom block 19 Drive unit 20 Imaging device unit 24 Imaging device 24a Imaging surface

Claims (15)

A lens unit having a lens part;
An image sensor unit that includes an image sensor that is fixed to the lens unit and that captures a subject image through the lens unit;
The lens unit is
A lens holding part for holding the lens part;
A movable part made of a cylindrical member fixed to the lens holding part and movable in one direction with respect to the imaging surface of the imaging element;
A drive unit for driving the movable unit in the one direction;
A guide portion provided in the lens holding portion and a contact portion provided in a portion of the movable portion facing the guide portion and contacting the guide portion, or a guide portion provided in the movable portion and the lens holding portion. A contact portion provided at a portion of the portion facing the guide portion and contacting the guide portion,
The contact portion is provided outside the inner diameter of the movable portion,
The surface of the guide portion with which the abutting portion abuts is an image formed by a surface in which the inclination of the lens portion in the optical axis direction with respect to the moving direction of the movable portion is determined according to the abutting location of the abutting portion module. The imaging module according to claim 1,
The imaging module is configured by a curved surface or a slope inclined in a direction non-perpendicular to a moving direction of the movable unit. The imaging module according to claim 2,
The guide portion is constituted by a plurality of curved surfaces or the inclined surfaces having different positions in the optical axis direction of the lens portion,
The said contact part is an imaging module which contacts with respect to the same curved surface or the said inclined surface. The imaging module according to any one of claims 1 to 3,
The imaging module configured to tilt the optical axis about a specific point on the optical axis of the lens unit before the guide unit and the contact unit are bonded and fixed. The imaging module according to claim 4,
The specific point on the optical axis is an imaging module located outside the lens holding unit. The imaging module according to claim 4,
The specific point on the optical axis is an imaging module located on the imaging element side with respect to the lens holding unit. The imaging module according to claim 4,
The specific point on the optical axis is an imaging module on the imaging surface of the imaging element. The imaging module according to any one of claims 1 to 7,
The abutment portion is an imaging module provided on a subject side of the lens holding portion. The imaging module according to any one of claims 1 to 8,
The lens holding portion has a first portion inserted into the hollow portion of the cylindrical member of the movable portion, and a length in a direction perpendicular to the optical axis direction of the lens portion outside the hollow portion. A second portion that is larger than the length of the hollow portion in the direction orthogonal to the moving direction of the movable portion;
An imaging module in which the guide portion is provided between the second portion and the movable portion. The imaging module according to any one of claims 1 to 9,
A pair of lens holding portions disposed on the subject side end in the optical axis direction of the lens portion are arranged in a direction perpendicular to the optical axis direction across the optical axis of the lens portion when viewed from the subject side. An imaging module provided with at least one set of notches. The imaging module according to claim 10, wherein
The contact portion is provided on the subject side of the lens holding portion,
Two sets of the pair of cutout portions are provided at the end of the lens holding portion on the subject side in the optical axis direction,
The notch portion is an adhesive pool in which an adhesive that bonds the lens holding portion and the movable portion accumulates.
The imaging module in which the cutout portion and the contact portion are adjacent to each other. The imaging module according to claim 10, wherein
Two sets of the pair of cutout portions are provided at the end of the lens holding portion on the subject side in the optical axis direction,
The imaging module in which the direction in which the pair of cutout portions in one of the two sets is arranged is orthogonal to the direction in which the pair of cutout portions in the other of the two sets is arranged. The imaging module according to claim 12, wherein
The imaging module in which the cutout portion is an adhesion reservoir in which an adhesive that adheres the lens holding portion and the movable portion is accumulated. The imaging module according to any one of claims 1 to 13,
The imaging module, wherein the abutting portion abuts on the guide portion at three or more points. A lens unit that includes a lens unit; and an image sensor unit that includes an image sensor that is fixed to the lens unit and captures a subject image through the lens unit, the lens unit holding the lens unit. A movable part made of a cylindrical member fixed to the lens holding part and movable in one direction with respect to the imaging surface of the imaging element, a drive part for driving the movable part in the one direction, and the lens A guide portion provided in a holding portion and a contact portion provided in a portion of the movable portion facing the guide portion and contacting the guide portion; or a guide portion provided in the movable portion and a lens holding portion. A contact portion that is provided in a portion facing the guide portion and that contacts the guide portion, and the contact portion is provided outside the inner diameter of the movable portion, and the contact portion contacts The surface of the guide portion is a method of manufacturing an imaging module configured by a surface in which an inclination in the optical axis direction of the lens portion with respect to a moving direction of the movable portion is determined according to a contact portion of the contact portion. ,
Moving the lens holding part with respect to the movable part according to the guide part, and aligning the direction perpendicular to the imaging surface of the imaging element and the optical axis direction of the lens part;
And a step of fixing the lens holding portion to the movable portion with an adhesive after the matching step.

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