JP5787510B2 - Bending zoom camera module - Google Patents

Description

The present invention relates to a mobile phone camera module, and more particularly, to a camera module having a high power zoom in and optical image stabilization function.

  In recent years, camera modules for mobile phones have been remarkably advanced in terms of higher pixels and higher functions, and have the same functions as digital cameras. Under such circumstances, there is an increasing demand for adding a zoom function to a camera of a mobile phone, and the demand for a mobile phone having a camera function of a small size, a high pixel, and a high magnification zoom is increasing day by day.

As the zoom of mobile phone cameras progresses, photographing on the telephoto side becomes essential, and camera shake is inevitably generated, making it difficult to obtain high-quality images.
For this reason, there is an increasing demand for a camera module having a high-power zoom and an optical camera shake prevention function in a cellular phone.

  However, since the camera module of the mobile phone is required to be smaller and thinner than anything else, it is difficult to increase the functionality of the camera module compared to a digital camera.

At present, in order to reduce the thickness, a camera module of a mobile phone is being investigated for a camera module of a bending zoom system. Bending zoom camera modules are thinned by bending light rays 90 degrees with a reflecting member such as a prism, but in general, the wide angle of the wide end of the photographic lens is in front of the reflecting member. Therefore, it is necessary to dispose a meniscus negative lens.
For this reason, lenses are arranged before and after the reflecting member, but this lens configuration is a major obstacle in manufacturing the camera module and in examining camera shake prevention.

On the other hand, with regard to camera shake correction, currently, a method of performing correction by moving the image sensor according to camera shake, a method of performing correction by moving one lens in the middle of the zoom lens group perpendicularly to the optical axis according to camera shake. Two methods have been studied.
The method of correcting the image sensor by moving it according to camera shake is a method that requires very fine control. One lens in the middle of the zoom lens group is moved perpendicularly to the optical axis according to camera shake. Both methods are extremely technically difficult because the aberration increases because the optical axis of the moved lens shifts, and a new means to correct the aberration is required. It has become.

  In the case of a bending zoom, there has been a proposal for correcting camera shake by moving a reflecting member. For example, in Patent Document 1, in a bent zoom lens module in which a subject-side lens, a reflecting member, a zoom, and a focus lens group are arranged in this order, the reflecting member is rotated around the intersection of the reflecting member and the optical axis to thereby rotate the optical axis. There has been proposed a bendable camera module with an anti-vibration means having a means for changing the direction and adjusting the eccentricity of the optical axis.

  However, in this method, when the subject side lens and the reflecting member are rotated around the intersection between the reflecting member and the optical axis, the optical axis of the subject side lens and the optical axis of the lens group downstream of the reflecting member are shifted. Will occur. If the optical axes of the optical lens group (lens center) do not match, the quality of the image will be greatly degraded, so alignment of the lens group is necessary, but alignment of the lens is very difficult, zooming The productivity of the lens module will be greatly inferior.

Further, in Patent Document 2, in a bent zoom lens module in which a subject side lens, a reflecting member, a zoom and a focus lens group are arranged in this order, the reflecting member and the front and rear lenses are integrated and reflected by the incident optical axis and the reflecting member. It has been proposed to perform camera shake correction by shifting the optical image by moving in a direction perpendicular to a plane formed by the optical axis.
However, in this method, the reflecting member and the front and rear lenses must be integrated and moved in a direction perpendicular to the plane formed by the incident optical axis and the optical axis reflected by the reflecting member. The reflected optical axis and the optical axis of the subsequent zoom system are shifted from each other, resulting in a problem that the quality of the image is deteriorated.

Furthermore, in Patent Document 3, one apex angle variable prism is arranged on the subject side of the photographing lens, and an aberration correction lens group is arranged after the apex angle changing prism to change the apex angle. Thus, a method for correcting the camera shake by changing the optical axis has been proposed.
However, in this method, not only a separate lens group is required to correct the aberration generated by the variable vertex angle prism, but the aberration correction must be optimized for every minute change in the vertex angle. There was a problem.

FIG. 1 shows a lens arrangement of a bending lens module using a prism as a conventional reflecting member, and a state of an optical axis when the prism is moved for camera shake correction.
In the conventional bending lens module shown in the drawing, a lens is arranged on the subject side of the prism, and the subject side lens is also moved in conjunction with the movement of the prism.
The optical axis of the lens on the subject side is incident on the reflecting surface of the prism at a constant angle even when the prism moves. For this reason, when the reflecting member is rotated for camera shake correction, a deviation occurs between the optical axis of the lens on the oblique body side and the optical axis of the lens group at the rear stage of the prism.

  With reference to FIG. 1, a description will be given of the deviation of the optical axis when the reflecting member in the conventional bending lens module is rotated. Note that the X axis and Y axis shown in the present specification and drawings are the optical axis of the zoom lens group and the light reflected from the reflecting member or the light of the subject side lens at the point where the optical axis of the zoom lens group and the reflecting member intersect. An axis perpendicular to a plane formed by the axis is an X axis, and an optical axis of the zoom lens group is a Y axis.

(1) in FIG. 1 shows the state of the optical axis when the prism is rotated +2 degrees in the positive direction with the X axis as the rotation axis. When the prism is rotated in the positive direction, it is integrated with the prism. The subject-side lens also rotates around the X-axis as the rotation axis, and the optical axis that passes through the subject-side lens is reflected by the prism and causes a deviation of +2 degrees from the original optical axis after the prism.
Similarly, (3) in FIG. 1 shows the state of the optical axis when the prism is rotated -2 degrees in the negative direction with the X axis as the rotation axis. When the prism is rotated in the negative direction, The lens also rotates in the negative direction with the X axis as the rotation axis, and the optical axis that has passed through the subject side lens is reflected by the prism and causes a deviation of -2 degrees from the original optical axis after the prism.

  In the subject image, the optical image is shifted on the optical axis that is shifted twice by the camera shake correction in (1) or (3) of FIG. If the optical axis is shifted in this way, aberration is generated and the quality of the image is lost, and the image quality cannot be maintained unless a means for correcting the aberration is separately provided.

  However, even when correcting the aberration with the lens group at the rear stage of the reflecting member, the optical axis deviation changes continuously depending on the state of camera shake, so the aberration correction is also performed with the optical axis deviation angle changing continuously. Therefore, it is necessary to correct aberrations so as to continuously follow, and there is a problem that the aberration correction mechanism becomes complicated and the structure of the lens module is unavoidable.

JP 2004-219930 A JP 2006-251037 A Japanese Patent Publication No. 2502282

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a compact, high-magnification zoom and image quality in a bendable zoom camera module. It is an object of the present invention to provide a camera module having an optical camera shake correction function that does not lower the image quality.

As described above, in the bent lens module, it is necessary to arrange the lens in front of the reflecting member, which makes it difficult to correct the camera shake.
The applicants have so far proposed a bendable zoom lens in which no lens is disposed in front of the prism (subject side) for the purpose of downsizing the zoom lens system (Japanese Patent Laid-Open No. 2007-155948). If this technology is used, it is not necessary to arrange a lens in front of the prism, so it is considered that various problems relating to camera shake correction of the bending zoom lens can be solved. It was.

  That is, the anti-vibration mechanism of the bending zoom camera module of the present invention does not have a lens that operates integrally with the reflecting member, and the reflecting member, the zoom lens group, the focus lens group, and the imaging device are arranged from the subject side. In the bent zoom lens device, an axis perpendicular to a plane formed by the optical axis of the zoom lens group and the optical axis reflected by the reflecting member at the intersection of the zoom lens group and the reflecting member, and the light of the zoom lens group The camera shake correction is performed by rotating the reflecting member about the axis.

  In the anti-vibration mechanism of the bending zoom camera module of the present invention, it is preferable that the reflecting member is a prism, and the holding member has a rotating shaft at the rotation center of the reflecting member and holds the reflecting member around the rotating shaft. It is preferable that the holding member is driven by a motor.

  Furthermore, the anti-vibration mechanism of the bending zoom camera module according to the present invention includes a motor having a motor, a first gear provided on a shaft of the motor, a second gear interlocked with the first gear, and a second gear. The screw is preferably composed of a screw screw cut into a screw and a nut attached to the screw screw, and the nut is moved up and down by forward / reverse rotation of the motor.

  In the anti-vibration mechanism of the bending zoom camera module according to the present invention, the holding member of the reflecting member has an arm portion that transmits the power of the driving device, and the arm portion is connected to the nut of the driving portion. It is preferable to rotate the holding member in conjunction with each other.

  According to the present invention, there is no deviation between the optical axis reflected by the reflecting member and the optical axis of the subsequent zoom system, which has been a problem in the past, no aberration is caused by camera shake correction, and the image quality is improved. It is possible to maintain and correct camera shake.

  In addition, according to the present invention, the reflection member holding member is rotated by a compact drive device that operates a nut mounted on a threaded shaft that works in conjunction with a motor. It is possible to provide a camera module having a small and thin anti-vibration function that is optimal for the above.

Schematic diagram of lens arrangement and optical axis of a conventional bending zoom camera module Schematic diagram of lens arrangement of a bending zoom camera module according to an embodiment of the present invention. Schematic diagram of lens arrangement and optical axis of a bending zoom camera module according to an embodiment of the present invention Schematic diagram of arrangement of lens system and drive unit system of bending zoom camera module according to one embodiment of the present invention 1 is an exploded perspective view of an anti-vibration mechanism of a bending zoom camera module according to an embodiment of the present invention. Schematic of the reflection member holding member of the vibration isolating mechanism of the bending zoom camera module according to one embodiment of the present invention. Schematic which shows the connection state of the reflection member drive part and reflection member holding member of the anti-vibration mechanism of the bending type zoom camera module which concerns on one Embodiment of this invention. Schematic which shows arrangement | positioning of the reflective member of the anti-vibration mechanism of the bending type zoom camera module which concerns on one Embodiment of this invention, a reflective member holding member, and a reflective member drive part.

  The anti-vibration mechanism of the bending zoom camera module of the present invention does not have a lens that operates integrally with the reflecting member, and the reflecting member, the zoom lens group, the focus lens group, and the imaging device are sequentially arranged from the subject side. In the bending zoom lens apparatus, the light perpendicular to the plane formed by the optical axis of the zoom lens group and the optical axis reflected by the reflection member at the intersection of the zoom lens and the reflection member, and the light of the zoom lens group The camera shake is corrected by rotating the reflecting member about the axis that coincides with the axis as a rotation axis.

FIG. 2 shows a lens arrangement of a photographing optical system according to an embodiment of the present invention.
In the lens arrangement shown in FIG. 2, the reflecting member 1, the first group lens 2 and the second group lens 3 as the zoom lens group, and the third group lens 4 as the focus lens group are arranged from the subject side, and an imaging device (not shown) is provided at the subsequent stage. It is the composition which arranged.

  The reflecting member 1 is configured to bend the light beam incident from the oblique body side at an angle smaller than 180 ° and transmit it to the lens group on the imaging side. The angle at which the reflecting member 1 is bent reflects the optical axis of the zoom lens group. Any angle may be used as long as the optical axis is reflected by the member and the reflected optical axis does not return to the zoom lens group, and a known reflective member such as a prism or a reflector (mirror) can be used as appropriate. Is preferred.

The first group lens 2 has a negative optical power as a whole, and is composed of a lens L1 having a negative optical power and a lens L2 having a positive optical power for correcting distortion at the wide end. From the viewpoint, when the first group lens 2 has a positive optical power as a whole, or when the positive / negative combination of the lenses is changed, a lens must be added to correct the distortion to correct the distortion. However, there is a problem that the total lens length becomes long.
In the zoom lens system, it is more preferable that the first negative lens L1 of the first group lens 2 is an aspherical surface in terms of correction of distortion at the wide end.

  The second group lens 3 has a positive optical power as a whole, and includes a lens L3 having a positive optical power, a lens L4 having a positive optical power, and a lens L5 having a negative optical power. This is preferable from the viewpoint of correcting distortion at the wide end, similarly to the first group lens 2, and if the second group lens 3 has a negative optical power as a whole or the combination of positive and negative lenses is changed, distortion aberration is caused. A lens must be added for correction, and there is a problem that the total lens length becomes long.

  In the second group lens 3, the ratio [D / f2] of the focal length f2 of the entire second group lens and the total lens length D of the entire second group lens is 0.75 <[D / f2] <1.25. At the same time, it is preferable that the radius of curvature R2B of the rearmost surface of the second group lens has a configuration of R2B> 0.

If the ratio [D / f2] of the total lens length D of the entire second group lens is larger than 1.25, the total length of the second lens group becomes longer, resulting in an obstacle to compactness. If the ratio is smaller than 0.75, astigmatism Cannot be corrected sufficiently.
Also, by setting the radius of curvature R2B of the rearmost surface of the second group lens 3 to R2B> 0, the principal point position is formed closer to the subject, so the focal length of the second group lens 3 can be reduced and the system can be made compact. R2B <0 is not preferable because the focal length of the second lens group 3 cannot be reduced.
In the zoom lens system, the second group lens 3 having the above-described configuration can realize compactness and good correction of astigmatism.

  The third group lens 4 is preferably composed of a lens L6 having a positive optical power from the viewpoint of correcting distortion, and a cover glass 5 of the image sensor and the image sensor 6 are arranged at the subsequent stage of the third group lens 4. Is done.

In this zoom lens system, the zoom magnification can be determined by changing the distance and position between the first group lens 2 and the second group lens 3 constituting the zoom lens group.
The optical axes of the lenses L1 to L5 constituting the zoom lens group need to match, and the optical axis of the zoom lens group and the optical axis of the autofocus lens group also need to match. .

  If the optical axis is deviated, an eccentricity phenomenon occurs, an aberration occurs in the image on the image sensor, and the image quality of the image formed on the image sensor is greatly deteriorated. Therefore, in the design of the lens module, the lens manufacture and the variation of the lens holding frame and the lens are strictly controlled so that the eccentricity by these lens groups is within 1 to 3 μm.

In addition, the zoom lens system according to the present invention has a configuration in which no lens is disposed on the subject side of the reflecting member 1, and no lens that operates integrally with the reflecting member 1 is provided behind the reflecting member 1. The reflecting member 1 operates independently of other lens systems.
A more detailed lens configuration of the zoom lens system according to the present invention is described in detail in JP-A-2007-155948.

When the optical axis on the subject side is bent by the reflecting member 1 so as to coincide with the optical axes of the zoom lens group, the autofocus lens group, and the image sensor, and the camera shake occurs, the imaging state is changed in the vertical and horizontal directions. The image is doubled to form an image.
In order to correct this camera shake situation, it is necessary to detect a deviation from the initially determined angle of view and to correct and follow the original angle of view.

  The anti-vibration mechanism of the present invention detects the correction direction of the deviation due to camera shake, and rotates the reflecting member about the two set axes as rotation axes, thereby changing the imaging state in the direction to correct the initial angle of view. It is what you bring.

One of the axes for rotating the reflecting member is the intersection of the optical axis of the zoom lens group and the reflecting surface of the reflecting member, and is perpendicular to the plane formed by the optical axis of the zoom lens group and the optical axis reflected by the reflecting member. The other axis is an axis that coincides with the optical axis (hereinafter referred to as the Y axis) of the zoom lens group.
The vibration isolating mechanism of the present invention corrects both vertical blur and horizontal blur due to camera shake by slightly rotating the reflecting member about the two axes as rotation axes.

  The anti-vibration mechanism of the present invention includes a shake detection unit for detecting a state of camera shake, a controller for controlling a drive unit of the reflection member based on a signal output from the shake detection unit, and a drive for rotating the reflection member And a reflection member holding member that moves the reflection member by transmitting the movement of the drive unit by holding the reflection member.

For example, an angular velocity sensor such as a vibration gyroscope can be used as the shake detection means for detecting camera shake.
The information detected by the shake detection means is sent to a controller that controls the drive unit of the reflecting member, and the controller controls the drive and drive speed of the drive unit for each of the X axis and the Y axis.

The drive unit for rotating the reflecting member is preferably an independent drive unit for the X-axis and the Y-axis, and a motor such as a stepping motor can be used as the drive source.
The camera module having the vibration isolation mechanism of the present invention is desirably as small as possible in order to be used for a mobile phone or the like. Therefore, when the motor is used as a drive source, the drive unit can be saved in space by converting the rotational motion of the motor into a linear motion and transmitting it to the reflecting member.

To convert the rotational motion of the motor to linear motion, for example, a threaded shaft connected to the motor and a gear is installed adjacent to the motor, and a nut with a rotation stopper is attached to the shaft to rotate the motor. This can be achieved by converting the movement into a vertical movement of the nut.
According to this method, it is not necessary to install a motor in the same direction as the rotation axis of the reflecting member, and the motor can be installed in a space where the module is vacant, and the module can be reduced in size.

  The reflection member holding member that holds the reflection member and is connected to the drive unit to transmit the movement of the drive unit to move the reflection member includes an X-axis holding member that holds the reflection member and has an X-axis rotation axis, It is preferable that the arm unit includes two Y-axis holding members each having a rotation shaft, each of which is connected to the driving unit and transmits the movement of the driving unit.

  The X-axis holding member holding the reflecting member is held by the Y-axis holding member so as to be rotatable about the X-axis, and the Y-axis holding member is rotatably held by the module exterior by a shaft that passes through the rotation center of the Y-axis. It is preferable.

  Next, camera shake correction of the anti-vibration mechanism of the bending zoom camera module according to the present invention will be described with reference to FIG.

FIG. 3 is a diagram showing the state of the optical axis in the bending zoom camera module according to the present invention.
The system according to an embodiment of the present invention shown in FIG. 3 uses a prism as a reflecting member, does not place a lens on the subject side of the reflecting member, and has a lens that operates integrally with the reflecting member at the subsequent stage of the reflecting member. It has a configuration that does not have.

(1) in FIG. 3 shows a case where the reflecting member (prism) is rotated twice in the positive direction with the X axis as the rotation axis, and A1 shows them using specific angles.
As shown in (1) of FIG. 3, the angle between the optical axis on the subject side of the reflecting member (prism) and the optical axis of the lens group at the rear stage of the reflecting member (prism) is caused by the rotation of the reflecting member (prism). Although tilted by 4 degrees, the optical axis at the rear stage of the reflecting member (prism) is not shifted.

Similarly, (3) in FIG. 3 is a case where the prism is rotated twice in the negative direction with the X axis as the rotation axis, and a specific angle in this case is indicated by A3.
According to A3, as in A1, the angle between the optical axis on the subject side and the optical axis of the rear lens group of the reflecting member (prism) is inclined by 4 degrees, but the optical axis of the rear stage of the reflecting member (prism) is not shifted. Absent.

  In the anti-vibration mechanism of the bending zoom camera module of the present invention, no lens is disposed on the subject side of the reflecting member, so the reflecting member is equivalent to a mirror, and even if the reflecting member is rotated, there is no problem with image quality. There is no camera shake prevention mechanism with a very simple structure.

In other words, when camera shake occurs, camera shake can be corrected by rotating the reflecting member about the X axis and / or Y axis as the rotation axis. Even if the reflecting member is moved, the optical axis after the reflecting member changes. Therefore, it is not necessary to have a means for correcting aberrations, which can easily maintain the initial quality of the image, is very simple, and tends to occur when camera shake is corrected.
Therefore, according to the present invention, it is possible to provide a camera module having a camera shake correction function that is very small and inexpensive.

  Hereinafter, an anti-vibration mechanism according to an embodiment of the present invention will be described with reference to FIGS.

FIG. 4 is a schematic diagram showing an overall configuration of a bending zoom camera module having a vibration isolation mechanism according to an embodiment of the present invention.
As shown in FIG. 4, in the photographing optical system, a reflecting member (prism) 1 is disposed as a reflecting member on the most object side, and a first lens group 2, a second lens group 3, an autofocus lens group as a zoom lens group in the subsequent stage. 3 group lens 4, image sensor cover glass (also used as IR cut filter) 5, and image sensor 6 are arranged.

A driving unit system for moving the lens group and the reflecting member is disposed around the photographing optical system. The first lens driving unit 10 moves the zoom lens group, that is, the first group lens 2 and the second group lens 3 to move the second lens group and the second group lens 3. The lens driving unit 20 moves the third group lens 4. The first lens driving unit 10 and the second lens driving unit 20 can be driven independently without being interlocked.
The reflection member (prism) 1 is driven by the first reflection member drive unit 30 and the second reflection member drive unit 40. The first reflection member drive unit 30 rotates the reflection member (prism) 1 about the X axis as a rotation axis. The second reflecting member driving unit 40 is a driving unit for rotating the reflecting member (prism) 1 about the Y axis as a rotation axis.

The first reflecting member driving unit 30 and the second reflecting member driving unit 40 can rotate the reflecting member (prism) 1 in an arbitrary direction by moving them simultaneously.
That is, no matter which direction the camera shake occurs, the first reflecting member driving unit 30 and the second reflecting member driving unit 40 are driven to cause the reflecting member (prism) 1 to follow the hand shaking direction. Camera shake can be corrected.

  Around the first reflecting member driving unit 30 and the second reflecting member driving unit 40, a shake detecting means 70 and a controller 60 are arranged. The controller 60 controls the driving and driving speed of the first reflecting member driving unit 30 and the second reflecting member driving unit 40 based on the signal output from the shake detecting means 70.

Next, the reflecting member holding member and the reflecting member driving unit of the vibration isolation mechanism according to the embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 5 is an exploded perspective view of the drive unit and the reflection member holding member of the anti-vibration mechanism of the bending zoom camera module according to the embodiment of the present invention, and FIG. 6 is a reflection composed of an X-axis member and a Y-axis member. FIG. 7 is a schematic view showing a connection state of the reflection member driving unit and the reflection member holding member, and FIG. 8 is a schematic view of the reflection member, the reflection member holding member, and the reflection member driving unit. Fig. 2 shows a schematic view housed in the housing of the module.

  The reflection member holding member 50 is a member that holds the reflection member (prism) 1 and is connected to the first and second reflection member driving units to rotate the reflection member in the camera shake correction direction. The shaft member 52 is composed of two members.

The reflecting member (prism) 1 is bonded to the X-axis member 51 with an adhesive and is held by the X-axis member 51. The X-axis member 51 has an X-axis rotation protrusion 51a and an X-axis arm 51b.
The X-axis rotation protrusion 51a is provided at a position that is the same as the X-axis center on both side surfaces of the X-axis member 51, serves as a rotation axis about the X-axis center of the reflecting member (prism) 1, and It becomes a connection part with 52.

The X-axis arm portion 51b has a shape protruding in the Y-axis direction from the lower portion of the X-axis member 51, and has an X-axis connection cutout portion 51c at the tip.
The X-axis coupling notch 51 c is coupled to the X-axis nut protrusion 35 a of the X-axis nut 35 of the X-axis drive unit, and the movement of the X-axis nut 35 is transmitted to the X-axis member 51. Further, the X-axis connection notch 51 c has a shape that is longer in the horizontal direction than in the vertical direction so as to be able to cope with the shift of the connection part due to the vertical movement of the X-axis nut 35.

  The first reflecting member drive unit 30, which is a rotation drive unit for the X axis, is attached to the X axis motor 31, the X axis first gear 32, the X axis second gear 33, and the X axis second gear 33, and cuts the screw. And an X-axis nut 35 attached to the X-axis screw screw 34.

The X-axis nut 35 is formed with an X-axis nut protrusion 35a, and the X-axis nut protrusion 35a is attached to an X-axis coupling notch 51c provided at the end of the X-axis arm 51b.
The X-axis nut 35 is provided with an X-axis rotation stop (not shown) for stopping the rotation of the X-axis nut 35, and the X-axis rotation stop is a rotation stop groove (not shown) provided in the module housing. ) So that it can move up and down. With this rotation stop, the X-axis nut 35 is not rotated by the rotation of the X-axis motor 31, but the X-axis screw screw 34 is turned by the X-axis nut 35 by the forward / reverse rotation of the X-axis motor 31. Drive up and down.

  The vertical movement of the X-axis nut 35 is transmitted to the X-axis arm 51b, the X-axis member 51 rotates about the X-axis rotation protrusion 51a, and the reflection member (prism) 1 is rotated to the X-axis rotation protrusion. 51a is rotated about the rotation axis (X axis).

A Y-axis notch 52 a provided on the Y-axis member 52 is connected to the X-axis rotation protrusion 51 a of the X-axis member 51 that holds the reflecting member (prism) 1. A shaft (not shown) serving as a rotation axis of the Y axis is inserted into the Y axis rotation hole 52 c provided in the Y axis member 52.
The Y-axis member 52 has a Y-axis arm portion 52b formed in the same plane as the Y-axis rotation hole portion 52c, and a Y-axis connection hole 52d is formed at the tip of the Y-axis arm portion 52b.

  The second reflecting member driving unit 40, which is a Y-axis rotation driving unit, includes a Y-axis motor 41, a Y-axis first gear 42, a Y-axis second gear 43, and screws attached to the Y-axis second gear 43. A Y-axis screw screw 44 cut and a Y-axis nut 45 attached to the Y-axis screw screw 44 are included.

The Y-axis nut 45 is formed with a Y-axis nut protrusion 45a, and the Y-axis nut protrusion 45a is attached to a Y-axis coupling hole 52d provided at the end of the Y-axis arm 52b.
Similar to the X-axis nut 35, the Y-axis nut 45 is provided with a Y-axis nut rotation stop. As the Y-axis motor 41 rotates, the Y-axis screw screw 44 is turned up and down by the Y-axis nut 45. To drive.

When the Y-axis nut 45 moves the Y-axis screw screw 44 that has been threaded up and down, the X-axis member 51 that holds the reflecting member (prism) 1 rotates around the Y-axis as a rotation axis.
In addition, the shape of the Y-axis coupling hole 52d provided at the end of the Y-axis arm portion 52b is longer in the horizontal direction than in the vertical direction so as to be able to cope with the displacement of the coupling site due to the vertical movement of the Y-axis nut 45. Is provided.

  As shown in FIG. 8, the bending zoom camera module according to an embodiment of the present invention is extremely compact by disposing a motor or the like for driving the reflecting member in a space formed after the reflecting member is disposed. Can be placed.

1 Reflective member (prism)
2 1st group lens 3 2nd group lens 4 3rd group lens L1 1st lens L2 of 1st group lens 2nd lens L3 of 1st group lens 1st lens L4 of 2nd group lens 2nd lens L5 of 2nd group lens 2nd lens L5 3 lens L6 1st lens 3 lens 3 image sensor cover glass 6 image sensor 7 subject side optical axis 8 image sensor side optical axis 10 first lens driving unit 20 second lens driving unit 30 driving first reflecting member Part 31 X-axis motor 32 X-axis first gear 33 X-axis second gear 34 X-axis screw screw 35 X-axis nut 35a X-axis nut protrusion 40 Second reflection member drive part 41 Y-axis motor 42 Y-axis first gear 43 Y-axis second gear 44 Y-axis screw 45 Y-axis nut 45a Y-axis nut protrusion 45b Y-axis nut rotation stop 50 Reflective member holding member 51 X-axis member 51a X-axis rotation Projection 51b X-axis arm 51c X-axis connection notch 52 Y-axis member 52a Y-axis notch 52b Y-axis arm 52c Y-axis rotation hole 52d Y-axis connection hole 60 Controller 70 Shake detection means 80 Reflective member housing 80a Y-axis nut rotation stop groove

Claims (1)

A reflecting member arranged closest to the subject,
A first group lens disposed downstream of the reflecting member, comprising a first lens having negative optical power and a second lens having positive optical power, and having negative optical power as a whole; Zoom lens group comprising a third lens having a positive power, a fourth lens having a positive optical power, and a fifth lens having a negative optical power, and a two-group lens having a positive optical power as a whole When,
A focus lens group disposed at a subsequent stage of the zoom lens group ;
An imaging device disposed in a subsequent stage of the focus lens group ;
An X axis perpendicular to a plane formed by the optical axis of the zoom lens group and the optical axis reflected by the reflecting member at the point where the zoom lens group and the reflecting member intersect, and the optical axis of the zoom lens group In a bendable zoom camera module having a vibration-proof mechanism that rotates the reflecting member about a Y axis that coincides with the rotation axis,
The anti-vibration mechanism is arranged around the reflecting member, and is held around the reflecting member together with the holding member that rotatably holds the reflecting member, and the holding member is centered on the rotation axis. Having a drive device for rotation;
The holding member driving device includes an X-axis motor and a Y-axis motor, a first gear provided on a shaft of each motor, a second gear respectively interlocked with each first gear, and each second gear. Each of the nuts attached to the screw screws by rotation of the X-axis and Y-axis motors is composed of a screw screw cut off each screw attached to the gear and a nut attached to each screw screw. Move up and down,
The holding member includes an X-axis member and a Y-axis member, and the X-axis member and the Y-axis member have an X-axis arm portion and a Y-axis arm portion that transmit power from the driving device, The unit is connected to each nut of the drive unit, transmits the operation of each nut, and rotates the reflecting member .

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