JP7269799B2 - Optical unit and manufacturing method thereof - Google Patents

Description

The present invention relates to an optical unit having a camera shake correction function and a manufacturing method thereof.

2. Description of the Related Art Compact mobile devices such as mobile phones and mobile devices, which have become popular in recent years, are equipped with an optical unit for photographing as a thin camera. Many of these optical units are provided with a camera shake correction function that suppresses disturbance of the captured image due to user's camera shake during shooting and enables clear shooting.

In the optical unit having the camera shake correction function, a movable body having an optical module such as a lens and an image sensor is supported by a rocking support mechanism such as a gimbal mechanism so as to be able to rock about two axes with respect to a fixed body. ing. Then, the movable body is oscillatingly driven based on the detection result of camera shake by a camera shake detection sensor such as a gyroscope, thereby suppressing the disturbance of the captured image due to the camera shake (see, for example, Patent Document 1).

Such an optical unit is provided with a drive mechanism for relatively swinging the movable body with respect to the fixed body based on the detection result of camera shake by the shake detection sensor. This drive mechanism is configured to oscillate drive the movable body using a magnetic drive force generated by pairs of, for example, four magnets and four coils arranged opposite to each other.

Further, the optical unit is provided with an origin position return mechanism for returning the optical axis of the optical module provided on the movable body to the normal origin position when the camera shake correction function is not activated. be.
For example, in the case of an arrangement structure in which the magnet of the drive mechanism is arranged on the fixed body and the coil is arranged on the movable body, the origin position return mechanism is arranged on the side of the movable body and faces the magnet (the side of the fixed body). For example, magnetic members such as metal pins are arranged at four locations. That is, in the origin position return mechanism, a magnetic attraction always acts between pairs of the magnets and the magnetic members facing each other, and the balance of the magnetic attraction of each pair causes the movable body to move to the above position. It is configured to take the origin position.
Even if the image stabilization function of the drive mechanism is activated and the movable body is displaced from the origin position, when the drive mechanism is in a non-operating state (OOF), the movable body is subjected to the magnetic attraction by the origin position return mechanism. Only force will work. As a result, the position of the optical axis of the optical module provided on the movable body can be returned to the normal origin position.

In the origin position return mechanism configured as described above, the assembly of the magnetic member to the movable body is accomplished by manually assembling the magnetic member, which is a minute component, with tweezers, for example, by an operator. is being done. The magnetic member incorporated in the movable body is also adhered and fixed to the movable body with an adhesive.

JP 2016-061956 A

However, in the conventional structure in which the magnetic member is manually incorporated into the movable body, workability is poor and automation is difficult, so productivity is low and labor saving is difficult. Further, when adopting a structure in which the manually assembled magnetic member is adhered and fixed to the movable body with an adhesive, extra man-hours are required for the adhesion, which reduces productivity. It also causes an increase in the cost of the product.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical unit and a method of manufacturing the same, in which a magnetic member can be incorporated efficiently with good workability and productivity can be improved.

In order to achieve the above object, the present invention provides a movable body having an optical module, a fixed body that accommodates the movable body therein, and a rocking support that supports the movable body to rockably with respect to the fixed body. a mechanism, a magnet arranged on one of the movable body and the fixed body, and a coil arranged on the other of the movable body and the fixed body, wherein the movable body is arranged relative to the fixed body; a drive mechanism for displacement, a magnetic member arranged on the movable body on which the coil is arranged or on the fixed body, and an origin position return mechanism composed of a pair of the magnet; a recess formed in the body or the fixed body and opening in the optical axis direction of the optical module, wherein the magnetic member is press-fitted into the recess, and the end faces of the ends in the press-fitting direction face each other. It is characterized by being separated from other members.
Here, the “end face” in the “end face of the tip in the press-fitting direction” is not limited to a flat surface shape, and is used in the specification of the present application to include a convex curved surface shape, a truncated cone shape, a tapered shape, and the like. there is

According to the optical unit of the present invention, since the magnetic member is assembled by press-fitting into the concave portion formed in the movable body or the fixed body, the optical unit can be efficiently assembled with good workability. productivity can be increased. In addition, the magnetic member can be firmly and accurately assembled at a predetermined position by press-fitting, without requiring a bonding process using an adhesive or the like. Moreover, since the man-hour required for assembly can be reduced, it is possible to reduce the cost of the optical unit. Further, it becomes possible to automate the press-fitting of the magnetic member, thereby saving labor and further improving productivity.

Further, in the above optical unit, the magnet is arranged on the fixed body, the coil is arranged on the movable body, the concave portion is a through hole, and the dimension of the through hole in the direction of the optical axis is the same as that of the oscillator. It is preferably set to a value that does not overlap with the dynamic support mechanism.

According to the above configuration, the dimension of the through hole in the optical axis direction is set to a value that does not overlap with the swing support mechanism. Accordingly, even if the through hole, which is the concave portion, is formed in the movable body in which the coil is arranged, it is not necessary to increase the size of each part. Therefore, it is possible to reduce the size of the optical unit having a structure in which the magnetic member can be fixed by press-fitting.

Further, in the optical unit, the magnetic member is press-fitted so that the end surface on the side opposite to the press-fitting direction and the opening end surface of the recess on the side opposite to the press-fitting direction of the magnetic member are flush with each other. In the above, it is preferable that the center position of the magnetic member in the longitudinal direction is set to a length that coincides with the center position of the magnet.

According to the above configuration, the length of the center position of the magnetic member in the longitudinal direction is set to coincide with the center position of the magnet. It can be fixed in a state of being positioned with high accuracy.

Further, in the optical unit, it is preferable that a periphery of the concave portion on a side opposite to the press-fitting direction of the magnetic member is flat.

According to the above configuration, since the periphery of the concave portion on the side opposite to the press-fitting direction of the magnetic member is flat, the tip end surface of the jig for pushing the magnetic member is aligned with the flat surface around the opening end of the concave portion. The magnetic member can be accurately fixed at a predetermined position simply by press-fitting the magnetic member until it abuts.

Further, in the optical unit, it is preferable that the magnetic member is configured by a cylindrical pin member.

According to the above configuration, since the magnetic member is composed of a cylindrical pin member, it is possible to press-fit the magnetic member composed of the pin member into the concave portion by an automatic machine. As a result, the working efficiency of assembly is enhanced, productivity is improved, and labor can be saved.
Further, since the magnetic member is a cylindrical pin member, the concave portion for receiving the magnetic member has a circular hole shape. As a result, when the movable body or the fixed body in which the concave portion is formed is made of resin, the magnetic member has a planar shape other than a cylindrical shape. The molding precision of the concave portion is good. As a result, the positional accuracy of the magnetic member press-fitted into the recess can be improved with respect to the magnet.

Further, in the optical unit, it is preferable that both ends of the magnetic member in the longitudinal direction have a symmetrical shape in the longitudinal direction with respect to the center in the longitudinal direction.

According to the above configuration, when the magnetic member is press-fitted into the recess, the press-fitting has no directionality because of the symmetrical shape. Thus, the magnetic member may be pushed into the recess with either end in the longitudinal direction being first. Therefore, the magnetic member can be press-fitted into the recess with good workability.

Further, in the optical unit, it is preferable that both longitudinal ends of the magnetic member have a tapered shape.

According to the above configuration, since both ends of the magnetic member in the longitudinal direction are tapered, the magnetic member can be press-fitted into the concave portion smoothly and with high accuracy.

In the optical unit, the movable body or the fixed body in which the recess is formed has a groove-shaped guide surface that contacts and guides the magnetic member press-fitted into the recess. It is preferable that the radius of curvature of the guide surface formed along the press-fitting direction of the magnetic member and in the direction perpendicular to the press-fitting direction of the magnetic member is larger than the radius of curvature of the guide surface in the direction perpendicular to the press-fitting direction of the magnetic member. .

According to the above configuration, the radius of curvature of the groove-shaped guide surface in the direction perpendicular to the press-fitting direction of the magnetic member is larger than the radius of curvature in the direction perpendicular to the press-fitting direction of the magnetic member. As a result, the magnetic member can be pushed in along the guide surface, thereby facilitating the work of attaching the magnetic member to the concave portion.

Further, in the optical unit, it is preferable that the magnetic member has an outer diameter such that the entirety of the magnetic member can be accommodated within a region surrounded by the groove-shaped guide surface and the groove opening surface.

According to the above configuration, the magnetic member has an outer diameter that allows the entirety to fit within the area surrounded by the groove-shaped guide surface and the groove opening surface. That is, the magnetic member has a structure in which it does not protrude from the outer surface of the movable body or the like on which the groove-shaped guide surface is formed. As a result, even when the components of the rocking support mechanism (for example, a gimbal mechanism) are arranged at positions facing the groove-shaped guide surface, the magnetic member is in contact with the components of the rocking support mechanism. Therefore, it is possible to reduce the risk of impeding the rocking movement.

The method of manufacturing an optical unit according to the present invention is characterized in that the magnetic member is press-fitted into the recess, and the end face of the tip in the press-fitting direction is arranged at a position separated from the opposing member.

According to the optical unit manufacturing method of the present invention, the magnetic member can be efficiently assembled with good workability, and the productivity of the optical unit can be enhanced. In addition, the magnetic member can be firmly and accurately assembled at a predetermined position by press-fitting.

Further, in the method for manufacturing the optical unit, it is preferable that the magnetic member is press-fitted into the concave portion from the side opposite to the subject.

According to the manufacturing method described above, in an optical unit in which an optical module such as a lens is arranged on the subject side, there are relatively few other parts on the side opposite to the subject. Therefore, it is easy to form a flat surface around the recess, and using this flat surface, the magnetic member can be press-fitted into the recess with good workability using a jig.

Moreover, in the method for manufacturing the optical unit, it is preferable that after the magnetic member is press-fitted into the concave portion, the contact portion between the magnetic member and the guide surface is adhered and fixed with an adhesive.

According to the above manufacturing method, the magnetic member press-fitted into the recess is firmly adhered and fixed to the guide surface with an adhesive, so that the possibility of the magnetic member dropping out of the recess can be reduced.

Further, in the optical unit manufacturing method, an adhesive may be supplied from the end face side opposite to the press-fitting direction of the magnetic member, and the adhesive may enter a contact portion between the magnetic member and the guide surface. preferable.
According to the manufacturing method described above, it is possible to easily adhere and fix with an adhesive.

Moreover, in the method for manufacturing the optical unit, it is preferable that the adhesive is a photocurable adhesive.
According to the above method, only by irradiating the photocurable adhesive with light such as ultraviolet rays, the photocurable adhesive hardens and the magnetic member is strongly adhered to the guide surface, so that adhesive fixation by the adhesive is facilitated. can be done.

According to the present invention, the magnetic member can be incorporated efficiently with good workability, and the productivity of the optical unit can be enhanced.

1 is an external perspective view of an optical unit according to an embodiment of the invention; FIG. 4 is a longitudinal sectional view of the optical unit according to the same embodiment; FIG. It is a perspective view of the main part of the optical unit according to the same embodiment. 4 is a cross-sectional view taken along line AA of FIG. 3; FIG. It is the perspective view which looked at the principal part of the optical unit which concerns on the same embodiment from the diagonally downward direction. It is a perspective view of the movable body of the optical unit according to the same embodiment. FIG. 7 is a cross-sectional view taken along line BB of FIG. 6; It is a front view of the magnetic member of the same embodiment. FIG. 9 is a cross-sectional view taken along line CC of FIG. 8; 4A to 4C are partial cross-sectional views showing steps (a) to (c) of press-fitting of a magnetic member in the optical unit according to the same embodiment. FIG. 11 is a cross-sectional view taken along line DD of FIG. 10(c);

An optical unit according to the present invention will be described in detail below based on embodiments shown in FIGS. 1 to 10. FIG.
As shown in FIG. 1, the optical unit 1 according to the present embodiment is an optical unit having at least pitching (vertical shake) and yawing (horizontal shake) correction functions of the optical module 11 . The optical module 11 is used, for example, as a thin camera mounted on a camera-equipped mobile phone, a tablet PC, or the like. The main structure of the optical unit 1 is an actuator portion that holds the optical module 11 and corrects the pitching and yawing directions of the optical module 11 .
A specific configuration of the optical unit 1 will be described in detail below.

<Basic configuration of the optical unit>
First, the basic configuration of the optical unit according to this embodiment will be described below with reference to FIGS. 1 and 2. FIG.
In the following description, the three mutually orthogonal axes are the X-axis, the Y-axis, and the Z-axis, respectively, as shown in FIG. In this case, the direction of the optical axis L of the optical module 11 coincides with the direction along the Z axis, and the upper side of FIG. 1 is the subject side. Among the vibrations in each direction, rotation around the X axis corresponds to pitching, rotation around the Y axis corresponds to yawing, and rotation around the Z axis corresponds to rolling. Equivalent to. 1 and 2, the subject side will be referred to as the "upper side", and the side opposite to the subject will be referred to as the "lower side".

The optical unit 1 shown in FIGS. 1 and 2 has a camera shake correction function, and includes a movable body 10 having an optical module 11, a fixed body 20 housing the movable body 10, and a fixed body 20 which accommodates the movable body 10. A gimbal mechanism 30 (see FIGS. 2, 3 and 6) as a rocking support mechanism that rockably supports the movable body 10 with respect to the fixed body 20, and a driving mechanism 40 (see FIG. 2 ) and an origin position return mechanism 50 (see FIG. 2) for returning the movable body 10 to the origin position.

Here, the configurations of the movable body 10, the fixed body 20, the gimbal mechanism 30, the drive mechanism 40, and the origin position return mechanism 50, which are basic components of the optical unit 1, will be described in order below.

<Movable body>
As shown in FIG. 2, the movable body 10 has a lens holder 12 that holds the lens of the optical module 11, and the optical module 11 is fitted and fixed inside the cylindrical portion 12A of the lens holder 12. . A rectangular plate-shaped base portion 12B is integrally formed at the end portion (lower end portion in FIG. 2) of the lens holder 12 on the side opposite to the object (lower end portion in FIG. 2). A shaped coil holding portion 12C is integrally formed toward the subject (upward in FIG. 2). A protrusion 12a for holding a coil 41 (see FIG. 2) constituting a part of the drive mechanism 40 described later integrally protrudes outward (in the Y-axis direction) from each coil holding portion 12C. is set.

As shown in FIG. 2, an imaging device 13 is arranged inside the lens holder 12. The imaging device 13 is directly or indirectly connected to one end of a flexible printed circuit board (FPC) 14 for signal output. It is mounted via the illustrated mounting board. That is, the optical module 11 and the imaging device 13 are provided on the movable body 10 .

Furthermore, electronic components such as a gyroscope 15 and a capacitor 16, which are shake detection sensors, are mounted on one end of the flexible wiring board 14. FIG.

The movable body 10 configured as described above is swingably supported with respect to the fixed body 20 by a gimbal mechanism 30 which will be described later.

<Fixed body>
As shown in FIGS. 1 and 2, the fixed body 20 is a rectangular box-shaped member in the present embodiment, and includes a first case 21 and a first rectangular tubular case 21 stacked in the Z-axis direction (vertical direction). The second case 22 , a rectangular plate-like cover 23 that covers the upper opening of the first case 21 , and a rectangular plate-like bottom plate 24 that covers the lower opening of the second case 22 . A circular opening 23a is formed in the center of the cover 23, and the optical module 11 provided on the movable body 10 faces the opening 23a.

As shown in FIG. 2, the movable body 10 is housed inside the fixed body 20 configured as described above in a state of being rockably supported with respect to the fixed body 20 by the gimbal mechanism 30. ing.

<Gimbal mechanism>
As shown in FIGS. 2, 3, and 6, the gimbal mechanism 30 for swingably supporting the movable body 10 with respect to the fixed body 20 includes the cylindrical portion 12A and the coil holding portion 12C of the lens holder 12 of the movable body 10. and a movable frame 31 disposed between. Here, the movable frame 31 is configured as a rectangular frame and has four corners around the optical axis L. As shown in FIG. First swing fulcrums 3, 3 (FIG. 3) are provided at two corners of the movable frame 31 that are diagonal in the direction of the first axis R1 shown in FIG. Second swing fulcrums 5, 5 (FIG. 3) are provided at two corners that are diagonal in the direction of the two axes R2.

Therefore, the movable body 10 can swing around the first axis R1 centering on the two first swing fulcrums 3, 3 provided on the diagonal line of the movable frame 31. It is possible to swing around the second axis line R2 centering on two second swing fulcrums 5, 5 provided on the . That is, the movable body 10 is supported by the gimbal mechanism 30 so as to be swingable about the first axis R1 and the second axis R2 with respect to the fixed body 20 .

<Drive Mechanism>
A driving mechanism 40 for relatively displacing the movable body 10 with respect to the fixed body 20 is arranged between the lens holder 12 of the movable body 10 and the first case 21 of the fixed body 20, as shown in FIG. In the present embodiment, the drive mechanism 40 includes a total of four coils 41 respectively provided on the four side surfaces of the movable body 10 and a position facing each coil 41 on the inner surface of the first case 21 of the fixed body 20 . It has four fixed plate-shaped magnets (permanent magnets) 42 .
The drive mechanism 40 moves the movable body 10 along the first axis R1 and second axis R1 shown in FIG. Shaking is corrected by rocking around the axis R2.

Here, each coil 41 is configured as an oval ring-shaped air-core coil attached to protrusions 12a projecting from coil holding portions 12C provided on four side surfaces of the movable body 10. As shown in FIG. In addition, each magnet 42 is divided into an N pole and an S pole in the direction of the optical axis L (vertical direction), and the magnetization patterns on the inner surface side and the outer surface side of the four magnets 42 are the same. Therefore, the magnets 42 adjacent in the circumferential direction are not attracted to each other. Also, the first case 21 of the fixed body 20 is made of a magnetic material and functions as a yoke for each magnet 42 .

<Flexible wiring board>
Here, one end of a flexible printed circuit board (FPC) 43 shown in FIG. 2 is electrically connected to each of the four coils 41. It is housed inside the second case 22 of the fixed body 20 while being alternately curved in the opposite direction a plurality of times (three times) in a horizontal U shape when viewed from the side.

The flexible wiring board 14 extending from the image pickup device 13, that is, the flexible wiring board 14 extending horizontally from the image pickup device 13, is curved in a horizontal U-shape when viewed from the side, and then extends substantially horizontally toward the left in FIG. It is curved in a horizontal U-shape when viewed from the side with a large radius of curvature again. The flexible wiring board 14 extends horizontally rightward in FIG.
After that, the flexible wiring board 14 is curved in a horizontal U shape when viewed from the side, and its end is inserted into and electrically connected to a control IC 44 mounted on the bottom plate 24 of the fixed body 20, and is curved. A part of the portion protrudes outside from a rectangular opening 22B formed in the lower case 22 .

<Origin position return mechanism>
The origin position return mechanism 50 adjusts the inclination of the optical axis L of the optical module 11 provided on the movable body 10 when the camera shake correction function is not working in the optical unit 1, that is, when it is in a non-operating state (OFF state). It performs the function of correcting and returning the optical axis L to the normal origin position.
The origin position return mechanism 50 includes four magnets 42 arranged at four positions on the four inner surfaces of the first case 21 of the fixed body 20, and magnetism incorporated at four positions opposite to the magnets 42 of the movable body 10. It is configured by a member 51 . 4 and 5 are diagrams showing the movable body 10 and fixed body 20 (upper case 21) of the optical unit 1 before the magnetic member 51 is incorporated. The provided optical module 11 is not shown.

Here, in this embodiment, the magnetic member 51 is configured as a cylindrical pin member. As shown in FIG. 8, the magnetic member 51 has a symmetrical shape in the longitudinal direction (vertical direction in FIG. 8) bordering on the longitudinal center position (center line CL in the drawing). Both longitudinal ends (upper and lower ends in FIG. 8) of the magnetic member 51 are tapered. Specifically, tapered surfaces 51a that taper toward each end (up and down in FIG. 8), in other words, have a reduced diameter are formed at both ends in the longitudinal direction of the magnetic member 51. .

<Concave portion, through hole>
As shown in FIGS. 4 and 5, four points of the flat base portion 12B of the lens holder 12 of the movable body 10, that is, the cylindrical portions 12A on two orthogonal axes (X axis and Y axis) passing through the optical axis L are sandwiched. Circular through-holes 12b as recesses that open in the optical axis L direction (Z-axis direction) are formed in each of the two locations facing each other. Here, the dimension of the through hole 12b in the optical axis direction, that is, the thickness t (see FIG. 10A) of the base portion 12B of the lens holder 12 does not overlap (interfere) with the gimbal mechanism 30 (see FIG. 2). set to a value.
In addition, in the present embodiment, the concave portion is configured by the through hole 12b, but the concave portion may be a circular hole (circular groove) that does not penetrate.

In the optical unit 1 according to this embodiment, as will be described later, four magnetic members 51 are press-fitted into through holes 12b formed at four locations on the movable body 10 side (base portion 12B of the lens holder 12). are assembled together. These magnetic members 51 are press-fitted from the side opposite to the subject (lower side in FIGS. 4 and 7) (see FIGS. 10A to 10C). For this reason, the inner diameter d (see FIG. 10A) of the through hole 12b formed in the resin-made movable body 10 is set slightly smaller than the outer diameter D (see FIG. 9) of the metal magnetic member 51. (d<D).

In this embodiment, as shown in FIG. 7, four through holes 12b are formed in the bottom surface of the base portion 12B of the lens holder 12 provided in the movable body 10 (the end surface on the side opposite to the press-fitting direction of the magnetic member 51). (only one is shown in FIG. 7) is flat. As will be described later, the magnetic member 51 is press-fitted into the through hole 12b using a jig 100 (see FIG. 10). The area is set larger than the opening area of the through hole 12b.

Further, as shown in FIG. 4, magnetic members 51 press-fitted into the respective through-holes 12b are provided at four locations (only one location is shown in FIG. 4) where the through-holes 12b of the lens holder 12 of the movable body 10 are formed. A groove-shaped guide surface 12c is formed along the press-fitting direction of the magnetic member 51, that is, along the vertical direction in FIG.

[Method for Manufacturing Optical Unit]
Next, a method for press-fitting the magnetic member 51 as one step of the method for manufacturing the optical unit 1 according to the present invention will be described below with reference to FIGS. 10 and 11. FIG.

When the magnetic member 51 is press-fitted into the four through holes 12b (only one is shown in FIG. 10) formed on the side of the movable body 10 (the base portion 12B of the lens holder 12), as shown in FIG. 10 (lens holder 12) is turned upside down. That is, the lens holder 12 is turned upside down so that the base portion 12B of the lens holder 12 formed with the through hole 12b is on the upper side in FIG.

In the above state, as shown in FIG. 10(a), the magnetic member 51 is set vertically upright above the through hole 12b. Next, as shown in FIG. 10(b), the magnetic member 51 is inserted and press-fitted into the through hole 12b from its tip (lower end in FIG. 10(b)). In this embodiment, the press-fitting of the magnetic member 51 is performed by an automatic machine (driving machine) (not shown), and the tip of a jig 100 provided in the automatic machine is the end surface of the magnetic member 51 opposite to the press-fitting side (FIG. 10). ), the magnetic member 51 is press-fitted into the through-hole 12b.
Here, as described above, the area of the tip surface of the jig 100 is set to be larger than the opening area of the through hole 12b. It can be pressed in by hammering.
In addition, as described above, both ends of the magnetic member 51 in the longitudinal direction are symmetrical in the longitudinal direction (vertical direction in FIG. 8) with the longitudinal center (center line CL) of the magnetic member 51 as a boundary. Therefore, the press-fitting of the magnetic member 51 has no directionality, and the magnetic member 51 may be driven into the through hole 12b with either end in the longitudinal direction of the magnetic member 51 coming first. Therefore, the magnetic member 51 can be press-fitted into the through hole 12b with good workability.

Furthermore, in the present embodiment, as described above, tapered surfaces 51a are formed at both ends of the magnetic member 51 in the longitudinal direction, as shown in FIG. It can be smoothly fitted and press-fitted into the through hole 12b with high accuracy.

Then, from the state shown in FIG. 10B, the magnetic member 51 is further driven into the through hole 12b, and finally, as shown in FIG. The magnetic member 51 is driven in until it is flush with the plane around the opening (same plane). As a result, the magnetic member 51 can be press-fitted into the through hole 12 b and securely fixed to the base portion 12 B of the lens holder 12 . When the magnetic member 51 is completely press-fitted into the through-hole 12b, the end surface of the magnetic member 51 in the press-fitting direction (lower end surface in FIG. 10C) is not in contact with the lens holder 12. That is, The end surface of the tip in the press-fitting direction is separated from the opposing member.

By the way, in this embodiment, as described above, the lens holder 12 in which the through hole 12b is formed has contact with the magnetic member 51 being press-fitted to guide the entrance of the magnetic member 51, as shown in FIG. Since there is the guide surface 12c, the magnetic member 51 can be smoothly guided along the guide surface 12c and securely press-fitted into the through hole 12b.

As described above, in the present embodiment, the magnetic member 51 is moved to a predetermined position simply by press-fitting the magnetic member 51 into the through-hole 12b until the tip surface of the jig 100 abuts on the flat surface around the opening end of the through-hole 12b. can be fixed easily and accurately. Here, the length H of the magnetic member 51 (see FIG. 8) is such that the central position CL in the longitudinal direction coincides with the central position 45 of the magnet 42 indicated by the dashed line, as shown in FIG. 10(c). is set to Therefore, the magnetic member 51 can be positioned and fixed to the magnet 42 with high accuracy only by the length H of the magnetic member 51 .

Further, as described above, the dimension t (see FIGS. 7 and 10A) of the through hole 12b in the optical axis direction is set to a value that does not overlap with the gimbal mechanism 30 (FIG. 7). Therefore, even if the through hole 12b is formed in the lens holder 12 of the movable body 10 in which the coil 41 is arranged, the magnetic member 51 can be fixed by press-fitting without increasing the size of each component. An effect is obtained that the size of the optical unit 1 can be reduced.

10A to 10C described above, the magnetic member 51 is press-fitted into the through-hole 12b and fixed. In the present embodiment, as shown in FIG. The radius of curvature of the formed guide surface 12c in the direction perpendicular to the press-fitting direction of the magnetic member 51 (horizontal direction in FIG. 11) is set larger than the radius of curvature of the magnetic member 51 (through hole 12b). Therefore, when the magnetic member 51 is press-fitted into the through hole 12b, a radial gap is formed between the guide surface 12c and the magnetic member 51. As shown in FIG.

In this embodiment, as shown in FIG. 11, the outer diameter of the magnetic member 51 is such that the entirety of the magnetic member 51 can be accommodated within the region E surrounded by the groove-shaped guide surface 12c and the groove opening surface 12e. In other words, the magnetic member 51 is structured so as not to protrude from the outer surface 12d of the lens holder 12 on which the groove-shaped guide surface 12c is formed. That is, the outer diameter D of the magnetic member 51 is formed smaller than the depth S of the groove-shaped guide surface 12c.
According to the present embodiment, since the magnetic member 51 is configured so as not to protrude, even when the movable frame 31 of the rocking support mechanism 30 is arranged at a position facing the concave groove-shaped guide surface 12c, the magnetic member 51 does not protrude. , the risk of the magnetic member 51 coming into contact with the movable frame 31 and hindering the swing can be reduced.

In this embodiment, an adhesive (not shown) is poured into the gap between the guide surface 12c and the magnetic member 51 from the side opposite to the press-fitting direction of the magnetic member 51 (upper side in FIG. 10(c)). Then, the magnetic member 51 is firmly adhered and fixed to the guide surface 12c of the lens holder 12 by the adhesive.
Incidentally, in this embodiment, a photocurable adhesive is used as the adhesive. By irradiating the photo-curable adhesive with light such as ultraviolet rays, the photo-curable adhesive hardens and strongly adheres the magnetic member 51 to the guide surface 12c. Fear can be reduced.

[Action of Optical Unit]
When the gyroscope 15 detects the hand shake of the user when taking a still image by the optical unit 1 configured as described above, the result is transmitted to the control IC 44 via the flexible wiring board 14 shown in FIG. , the control IC 44 that has received the detection result drives and controls the driving mechanism 40 . That is, the control IC 44 supplies a driving current that cancels the camera shake detected by the gyroscope 15 to each of the four coils 41 via the flexible wiring board 14, and controls the balance of the supplied driving current. . As a result, the movable body 10 swings about the first axis R1 and the second axis R2 shown in FIG. 1 with respect to the fixed body 20, and camera shake is corrected.

[Description of effects of the present embodiment]
As is clear from the above description, according to the present embodiment, the magnetic member 51 is press-fitted into the through hole 12b formed in the lens holder 12 of the movable body 10, so that the magnetic member 51 can be efficiently assembled with good workability. and the productivity of the optical unit 1 can be improved.
In addition, the magnetic member 51 can be firmly and accurately assembled at a predetermined position by press-fitting without requiring an adhesion step using an adhesive or the like. Moreover, since the man-hour required for assembly can be reduced, the cost of the optical unit 1 can be reduced.
Furthermore, since the press-fitting of the magnetic member 51 can be performed by an automatic machine (a hammering machine), labor can be saved and productivity can be further improved by automation.
In particular, in this embodiment, since the magnetic member 51 is formed of a cylindrical pin member, it becomes easy to press-fit the magnetic member 51 into the through hole 12b by an automatic machine (a driving machine).

Further, in this embodiment, since the shape of the through hole 12b is a circular hole, when the lens holder 12 having the through hole 12b formed thereon is made of resin, the magnetic member 51 can have a plane shape other than a cylindrical shape. The through hole 12b is formed with higher accuracy than when it has a shape, and the positional accuracy of the magnetic member 51 press-fitted into the through hole 12b with respect to the magnet 42 can be easily increased.

Further, in the present embodiment, the magnetic member 51 is press-fitted into the through hole 12b from the side opposite to the subject (lower side in FIG. 7, upper side in FIG. 10). In the optical unit 1 according to the present embodiment in which an optical module such as the optical module 11 is arranged on the object side, there are relatively few other parts on the side opposite to the object. Therefore, in this embodiment, it is easy to form a flat surface around the through hole 12b formed in the base portion 12B of the lens holder 12. Using this flat surface, the magnetic member 51 is attached to the through hole 12b using the jig 100. can be easily press-fitted into the

[Other embodiments]
The optical unit 1 according to the present invention is basically configured as described above, but it is also possible to change or omit the partial configuration without departing from the gist of the present invention. Of course it is possible.

In the above embodiment, of the coil 41 and the magnet 42 that constitute the drive mechanism 40 , the coil 41 is arranged on the movable body 10 , the magnet 42 is arranged on the fixed body 20 , and the magnetism that constitutes the origin position return mechanism 50 is described. Although the through-hole 12 for press-fitting the member 51 is formed on the movable body 10 side, a configuration opposite to this may be employed. That is, of the coil 41 and the magnet 42 that constitute the drive mechanism 40, the coil 41 is arranged on the fixed body 20, the magnet 42 is arranged on the movable body 10, and the magnetic member 51 that constitutes the origin position return mechanism 50 is press-fitted. A through-hole 12b for this purpose may be formed on the fixed body 20 side.

1... optical unit, 3... first rocking fulcrum, 5... second rocking fulcrum,
10... movable body, 11... lens (optical module),
12... Lens holder, 12A... Cylindrical part of lens holder,
12B... base portion of lens holder, 12C... coil holding portion of lens holder,
12a... Protrusion of coil holding portion, 12b... Through hole (recess),
12c... concave groove guide surface of lens holder, 12d... outer surface of lens holder,
12e... concave groove opening surface, 13... imaging element (optical module),
14... Flexible printed circuit board (FPC),
15 Gyroscope (shake detecting means) 16 Capacitor 20 Fixed body
21... First case of fixed body, 22... Second case of fixed body,
22A ... base portion of the second case, 22B ... opening of the second case,
23... cover of fixed body, 23a... opening of cover, 24... bottom plate of fixed body,
30... gimbal mechanism (swing support mechanism), 31... movable frame of gimbal mechanism,
40... drive mechanism, 41... coil, 42... magnet,
43... Flexible printed circuit board (FPC), 44... IC for control,
45...Center of magnet, 50...Origin position return mechanism, 51...Magnetic member,
100... jig, d... inner diameter of through-hole, D... outer diameter of magnetic member,
E ... the area surrounded by the concave groove-shaped guide surface and the concave groove opening surface,
H... Length of magnetic member, L... Optical axis, S... Depth of groove-shaped guide surface,
R1... first axis line, R2... second axis line, t... dimension of through-hole in optical axis direction

Claims (14)

a movable body comprising an optical module;
a fixed body that accommodates the movable body therein;
a rocking support mechanism that rockably supports the movable body with respect to the fixed body;
A drive for relatively displacing the movable body with respect to the fixed body, comprising a magnet arranged on one of the movable body and the fixed body and a coil arranged on the other of the movable body and the fixed body a mechanism;
an origin position return mechanism composed of a pair of a magnetic member arranged on the movable body or the fixed body on which the coil is arranged, and the magnet;
a recess formed in the movable body or the fixed body in which the coil is arranged and opening in the optical axis direction of the optical module;
The magnetic member is
It is arranged in the recess in a press-fit state,
The end face of the tip in the press-fitting direction is separated from the opposing member ,
The magnetic member is press-fitted so that the end face on the side opposite to the press-fitting direction and the opening end face on the side opposite to the press-fitting direction of the magnetic member of the recess are flush with each other. The optical unit is characterized in that the central position of the direction is set to a length that coincides with the central position of the magnet . a movable body comprising an optical module;
a fixed body that accommodates the movable body therein;
a rocking support mechanism that rockably supports the movable body with respect to the fixed body;
A drive for relatively displacing the movable body with respect to the fixed body, comprising a magnet arranged on one of the movable body and the fixed body and a coil arranged on the other of the movable body and the fixed body a mechanism;
an origin position return mechanism composed of a pair of a magnetic member arranged on the movable body or the fixed body on which the coil is arranged, and the magnet;
a recess formed in the movable body or the fixed body in which the coil is arranged and opening in the optical axis direction of the optical module;
The magnetic member is
It is arranged in the recess in a press-fit state,
The end face of the tip in the press-fitting direction is separated from the opposing member ,
The movable body or the fixed body in which the recess is formed has a groove-shaped guide surface along the press-fitting direction of the magnetic member that contacts and guides the magnetic member press-fitted into the recess. formed by
The optical unit according to claim 1, wherein the radius of curvature of the guide surface in a direction orthogonal to the press-fitting direction of the magnetic member is larger than the radius of curvature of the guide surface in a direction orthogonal to the press-fitting direction of the magnetic member. 3. The optical unit according to claim 2 ,
The optical unit according to claim 1, wherein the magnetic member has an outer diameter such that the entirety of the magnetic member can be accommodated within a region surrounded by the groove-shaped guide surface and the groove opening surface. In the optical unit according to any one of claims 1 to 3 ,
the magnet is arranged on the fixed body, the coil is arranged on the movable body,
The optical unit according to claim 1, wherein the concave portion is a through hole, and the size of the through hole in the optical axis direction is set to a value that does not overlap with the swing support mechanism. The optical unit according to any one of claims 1 to 4 ,
The optical unit according to claim 1, wherein a periphery of the concave portion on a side opposite to the press-fitting direction of the magnetic member is flat. In the optical unit according to any one of claims 1 to 5 ,
The optical unit according to claim 1, wherein the magnetic member comprises a cylindrical pin member. The optical unit according to any one of claims 1 to 6 ,
An optical unit, wherein both ends of the magnetic member in the longitudinal direction are symmetrical in the longitudinal direction with respect to the center in the longitudinal direction. The optical unit according to claim 7 , wherein
An optical unit, wherein both longitudinal ends of the magnetic member are tapered. In the method for manufacturing the optical unit according to any one of claims 1 and 4 to 8 ,
A method of manufacturing an optical unit, comprising: press-fitting the magnetic member into the recess, and arranging the end surface of the tip in the press-fitting direction at a position separated from another member facing the magnetic member. 4. In the method for manufacturing an optical unit according to claim 2 or 3 ,
A method of manufacturing an optical unit, comprising: press-fitting the magnetic member into the recess, and arranging the end surface of the tip in the press-fitting direction at a position separated from another member facing the magnetic member. In the method for manufacturing an optical unit according to claim 9 ,
A method of manufacturing an optical unit, wherein the magnetic member is press-fitted into the concave portion from the side opposite to the subject. In the method for manufacturing an optical unit according to claim 10 ,
A method of manufacturing an optical unit, comprising: after press-fitting the magnetic member into the concave portion, a contact portion between the magnetic member and the guide surface is adhered and fixed with an adhesive. In the method for manufacturing an optical unit according to claim 12,
A method of manufacturing an optical unit, comprising: supplying an adhesive from an end face side opposite to the press-fitting direction of the magnetic member, and allowing the adhesive to enter a contact portion between the magnetic member and the guide surface. 14. In the method for manufacturing an optical unit according to claim 12 or 13,
A method of manufacturing an optical unit, wherein the adhesive is a photocurable adhesive.

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