JPWO2020022025A1 - Lens barrel, image pickup device, lens control method and lens control program - Google Patents

Abstract

When moving a lens in the direction of the optical axis using a moving magnet type voice coil motor, a lens barrel, an image pickup device, a lens control method, and a lens barrel that can perform highly accurate drive control even if the magnetic force fluctuates. Provides a lens control program. The lens barrel includes first and second movable units that move the first and second lenses constituting the zoom lens in the direction of the optical axis of the zoom lens. The first movable unit is a moving magnet type voice coil motor, and the magnet arranged in the movable portion receives a magnetic force according to a relative position with another magnetic body. The control unit 100-1 determines the first operation amount for position control of the first movable unit, which is calculated based on the position command value of the first lens and the current position of the first lens. The drive of the first movable unit is controlled by making corrections based on the information indicating the relative positions of the magnet and the magnetic body.

Description

The present invention relates to a lens barrel, an image pickup device, a lens control method, and a lens control program, and is particularly applicable when a moving magnet type voice coil motor is used as an actuator of a movable unit that moves a lens in the direction of the optical axis. Regarding technology.

Conventionally, a voice coil motor has been widely used as an actuator for moving a lens.

The voice coil motor includes a moving coil type voice coil motor in which a coil is arranged in a movable part and a magnet is arranged in a fixed part, and a magnet is arranged in a movable part and a coil is arranged in a fixed part. There is a moving magnet type voice coil motor.

The moving coil type voice coil motor has the advantage of being able to perform highly accurate drive control because the attractive and repulsive forces do not fluctuate between the magnet of the moving part and other magnetic materials even if the moving part moves. However, there is a problem that the outer diameter is larger than that of the moving magnet type voice coil motor.

On the other hand, in a moving magnet type voice coil motor, the attractive force and repulsive force generated between the magnet of the moving part and another magnetic material fluctuate as the moving part moves, which hinders highly accurate drive control. However, there is an advantage that the outer diameter can be reduced as compared with the moving coil type voice coil motor.

Patent Document 1 describes a zoom lens having a bending optical system composed of first to fourth groups in which a prism is arranged between the first group and the second group.

The first group is a so-called anti-vibration mechanism that moves in the direction orthogonal to the optical axis by two moving magnet type voice coil motors and reduces image deflection on the image plane caused by vibration such as camera shake. Consists of. The second group and the third group each move along the optical axis by the driving force transmitted from the two motors via the feed screw, and perform a scaling operation.

Further, Patent Document 1 states, "In a moving magnet type electromagnetic actuator in which a permanent magnet is supported on a movable first lens frame, an external magnetic material with respect to the magnetic field of the permanent magnet is used in order to perform highly accurate drive control. It is required to eliminate the influence from the above. ”(Patent Document 1 paragraph [0064]).

The zoom lens described in Patent Document 1 is a bending optics system, and the magnet (permanent magnet) held in the first lens frame of the first group driven by the voice coil motor depends on the moving direction of the first group. It approaches or moves away from the zoom drive motor, which is a magnetic material.

In the invention described in Patent Document 1, two voice coil motors of the moving magnet type are arranged in the second quadrant and the third quadrant of the first group, and the motor is compared with the case where the two voice coil motors are arranged in the first quadrant and the fourth quadrant. The distance from the (magnetic material) is increased to make it difficult for the influence from the magnetic material to reach.

Japanese Unexamined Patent Publication No. 2015-99361

In the zoom lens described in Patent Document 1, the first group is moved by a moving magnet type voice coil motor, and the first group is moved in a direction orthogonal to the optical axis to form an anti-vibration mechanism. , It is not a lens that moves in the optical axis direction.

Further, the distance from the motor (magnetic material) is compared with the case where the two voice coil motors of the moving magnet type are arranged in the second quadrant and the third quadrant of the first group and arranged in the first quadrant and the fourth quadrant. However, depending on the arrangement of the external motor (magnetic material), the influence from the magnetic material cannot be reduced, and the moving magnet type voice coil motor is used. There is a problem that drive control cannot be performed with high accuracy.

The present invention has been made in view of such circumstances, and when the lens is moved in the direction of the optical axis by using a moving magnet type voice coil motor, highly accurate drive control is performed even if the magnetic force fluctuates. It is an object of the present invention to provide a lens barrel, an image pickup apparatus, a lens control method, and a lens control program capable of performing the above.

The lens barrel according to one aspect of the present invention includes a first movable unit that moves the first lens constituting the zoom lens in the direction of the optical axis of the zoom lens, and a second lens constituting the zoom lens. The first movable unit includes a second movable unit that moves the zoom lens in the direction of the optical axis or a direction orthogonal to the direction of the optical axis, and a control unit that controls the drive of the first movable unit. Is a moving magnet type voice coil motor in which a first magnet is arranged in a movable portion and a first coil is arranged in a fixed portion, and the first magnet is a first magnet and a second magnet. The control unit receives a magnetic force from the magnetic body according to the relative position with respect to the magnetic body included in the movable unit of A first calculation unit that calculates a first operation amount for controlling the position of the unit and a relative position information acquisition unit that acquires information indicating the relative position between the first magnet and the magnetic body are provided, and the acquired relative The first operation amount is corrected based on the information indicating the position, and the drive of the first movable unit is controlled.

The first movable unit is a moving magnet type voice coil motor, and the magnets arranged in the movable portion correspond to the relative positions with other magnetic materials (magnetic materials included in the second movable unit). Receives magnetic force from a magnetic material.

According to one aspect of the present invention, the first operation amount for controlling the position of the first movable unit, which is calculated based on the position command value of the first lens and the current position of the first lens, is determined. Since the first operation amount is corrected based on the information indicating the relative position between the first magnet and the magnetic body and the drive of the first movable unit is controlled, high accuracy is obtained even if a magnetic force is received from another magnetic body. Can be driven and controlled.

In the lens barrel according to another aspect of the present invention, the control unit calculates a second operation amount for correcting the first operation amount, and a second operation for canceling the magnetic force received by the first magnet from the magnetic body. It is preferable to have a unit and control the drive of the first movable unit based on the calculated second operation amount.

According to another aspect of the present invention, the second manipulated variable corrected for the first manipulated variable is calculated so as to cancel the magnetic force (attractive force or repulsive force) received by the first magnet from the other magnetic material, and the second manipulated variable is calculated. Since the drive of the first movable unit is controlled based on the second operation amount by the operation amount of 2, good drive characteristics can be ensured.

In the lens barrel according to still another aspect of the present invention, the relative position information acquisition unit acquires the zoom position of the zoom lens, and the second calculation unit makes the first magnet magnetic based on the acquired zoom position. It is preferable to calculate the output that cancels the magnetic force received from the body, and to calculate the second operation amount from the first operation amount based on the calculated output.

Since the first movable unit moves according to the zoom position of the zoom lens, by acquiring the zoom position, the first magnet and other magnetic material arranged in the movable portion of the first movable unit can be combined with each other. Information indicating the relative position of the lens can be acquired.

In the lens barrel according to still another aspect of the present invention, the relative position information acquisition unit adds a first offset indicating individual variation of the lens barrel to the zoom position of the zoom lens, and the first offset. It is preferable to acquire the zoom position in which is added.

Since the zoom position of the zoom lens varies from individual to individual lens barrel, by adding a first offset that indicates individual variation to the zoom position of the zoom lens, the zoom position does not vary from individual to individual. (Relative position with high accuracy) can be acquired.

In the lens barrel according to still another aspect of the present invention, the relative position information acquisition unit acquires the zoom position of the zoom lens and the position of the movable unit of the first movable unit, respectively, and the second calculation unit acquires the position. It is preferable to calculate the output that cancels the magnetic force received by the first magnet from the magnetic body based on the zoom position and the position of the movable portion, and to calculate the second operation amount from the first operation amount based on the calculated output.

The entire first movable unit moves according to the zoom position of the zoom lens, and the movable portion (first magnet) of the first movable unit moves within the movable unit. Therefore, the relative position between the first magnet and the other magnetic material can be obtained more accurately by acquiring the zoom position of the zoom lens and the position of the movable portion of the first movable unit, respectively.

In the lens barrel according to still another aspect of the present invention, the relative position information acquisition unit adds a second offset indicating individual variation of the lens barrel to the position of the movable portion, and sets the second offset. It is preferable to acquire the position of the added movable part.

Since the position of the movable part of the first movable unit (the position controlled according to the zoom position) varies from individual lens barrel to individual, the position of the movable part varies from individual to individual. By adding an offset, it is possible to acquire the position of the movable part (relative position with high accuracy) that does not vary from individual to individual.

The lens barrel according to still another aspect of the present invention includes a temperature detector that detects the temperature inside the lens barrel, and the second calculation unit detects the temperature when calculating the output that cancels the magnetic force. It is preferable to correct the output that cancels the magnetic force based on the temperature.

Since the magnetic force changes in proportion to the temperature, it is possible to reduce the influence of the positional deviation during the transient response by performing control in which the magnetic force compensation is added to the temperature compensation.

In the lens barrel according to still another aspect of the present invention, the second calculation unit includes a magnetic force calculation unit that calculates the magnetic force received by the first magnet from the magnetic body based on the acquired zoom position, and the first movable unit. It is equipped with a thrust constant calculation unit that acquires the position of the movable part of the unit and calculates the thrust constant for energization of the first coil based on the acquired position of the movable part. It is preferable to calculate the output that cancels the magnetic force received by the magnet 1 from the magnetic material.

In the lens barrel according to still another aspect of the present invention, a temperature detector for detecting the temperature inside the lens barrel is provided, and the magnetic force calculation unit and the thrust constant calculation unit of the second calculation unit detect by the temperature detector. It is preferable to correct the magnetic force and the thrust constant calculated based on the calculated temperature.

The lens barrel according to still another aspect of the present invention includes a storage unit that stores position control calculation parameters according to the zoom position of the zoom lens, and the relative position information acquisition unit acquires the zoom position of the zoom lens. The second calculation unit can select the corresponding position control calculation parameter from the storage unit based on the acquired zoom position, and calculate the second operation amount from the first operation amount based on the selected position control calculation parameter. preferable.

The lens barrel according to still another aspect of the present invention includes a storage unit that stores position control calculation parameters according to the zoom position of the zoom lens and the position of the movable portion of the first movable unit, and is a relative position information acquisition unit. Acquires the zoom position of the zoom lens and the position of the movable part of the first movable unit, respectively, and the second calculation unit performs the corresponding position control calculation from the storage unit based on the acquired zoom position and the position of the movable part. It is preferable to select a parameter and calculate the second operation amount from the first operation amount according to the selected position control calculation parameter.

In the lens barrel according to still another aspect of the present invention, the second movable unit is a moving coil type voice in which a second coil is arranged in a movable part and a second magnet is arranged in a fixed part. It is preferably a coil motor.

In the lens barrel according to still another aspect of the present invention, the magnetic material contained in the second movable unit is a yoke having a second magnet.

In the lens barrel according to still another aspect of the present invention, it is preferable that the first movable unit and the second movable unit are arranged inside a zoom group that takes different movement loci by the zoom operation.

The image pickup apparatus according to still another aspect of the present invention includes the lens barrel according to any one of the above.

An imaging device according to still another aspect of the present invention includes a zoom lens including a first lens and a second lens, and a first movable unit that moves the first lens in the direction of the optical axis of the zoom lens. A second movable unit that moves the second lens in the direction of the optical axis of the zoom lens or a direction orthogonal to the direction of the optical axis, and a control unit that controls the drive of the first movable unit are provided. The first movable unit is a moving magnet type voice coil motor in which a first magnet is arranged in a movable portion and a first coil is arranged in a fixed portion, and the first magnet is a first magnet. The magnet receives a magnetic force from the magnetic material according to the relative position of the magnet and the magnetic material contained in the second movable unit, and the control unit is based on the position command value of the first lens and the current position of the first lens. A first calculation unit that calculates the first operation amount for position control of the first movable unit, and a relative position information acquisition unit that acquires information indicating the relative position between the first magnet and the magnetic body. The first operation amount is corrected based on the acquired information indicating the relative position, and the drive of the first movable unit is controlled.

In the image pickup apparatus according to still another aspect of the present invention, the control unit calculates a second operation amount for correcting the first operation amount, and a second operation for canceling the magnetic force received by the first magnet from the magnetic body. It is preferable to have a unit and control the drive of the first movable unit based on the calculated second operation amount.

In the image pickup apparatus according to still another aspect of the present invention, the relative position information acquisition unit acquires the zoom position of the zoom lens, and the second calculation unit has the first magnet made of a magnetic material based on the acquired zoom position. It is preferable to calculate the output that cancels the magnetic force received from the first operation amount and calculate the second operation amount from the first operation amount based on the calculated output.

In the invention according to still another aspect, the first movable unit that moves the first lens constituting the zoom lens in the direction of the optical axis of the zoom lens and the second lens constituting the zoom lens are the zoom lenses. The first movable unit includes a second movable unit that moves in the direction of the optical axis or a direction orthogonal to the direction of the optical axis, and the first movable unit is provided with a first magnet in the movable portion and a first in the fixed portion. It is a moving magnet type voice coil motor in which the above coils are arranged, and the first magnet exerts a magnetic force corresponding to the relative position between the first magnet and the magnetic body included in the second movable unit. In the lens control method applied to the lens barrel received from, the first step is based on the step of outputting the position command value of the first lens, the position command value of the first lens, and the current position of the first lens. A step of calculating the first operation amount for controlling the position of the movable unit, a step of acquiring information indicating the relative position between the first magnet and the magnetic body, and a first step based on the acquired information indicating the relative position. It includes a step of correcting the operation amount of 1 and controlling the drive of the first movable unit.

The present invention according to still another aspect zooms the first movable unit that moves the first lens constituting the zoom lens in the direction of the optical axis of the zoom lens and the second lens constituting the zoom lens. It includes a second movable unit that moves in the direction of the optical axis of the lens or in a direction orthogonal to the direction of the optical axis, and the first movable unit has a first magnet arranged in the movable portion and a first magnet in the fixed portion. It is a moving magnet type voice coil motor in which one coil is arranged, and the first magnet magnetically applies magnetic force according to the relative position between the first magnet and the magnetic body included in the second movable unit. In the lens control program applied to the lens barrel received from the body, the function of outputting the position command value of the first lens, the position command value of the first lens, and the current position of the first lens are used as the basis for the first position. Based on the function of calculating the first operation amount for controlling the position of one movable unit, the function of acquiring information indicating the relative position between the first magnet and the magnetic body, and the information indicating the acquired relative position. The computer realizes a function of correcting the first operation amount and controlling the drive of the first movable unit.

According to the present invention, when a moving magnet type voice coil motor is used to move a lens in the direction of the optical axis, highly accurate drive control can be performed even if the magnetic force fluctuates.

Top view showing an embodiment of an interchangeable lens to which the present invention is applied. Rear view of the interchangeable lens shown in FIG. 3-3 cross-sectional view of FIG. 2 when zooming to the wide end 4-4 sectional view of FIG. 2 when zooming to the wide end 4-4 sectional view of FIG. 2 when zooming to the telephoto end 6-6 sectional view of FIG. 7-7 sectional view of FIG. The figure which shows the moving state of each lens group at the time of a zoom operation Cross-sectional view showing the support structure of the 3rd lens group movable holding frame and the 4th lens group movable holding frame. Cross-sectional view showing the mounting structure of the front group drive actuator of the third lens group Cross-sectional view showing the mounting structure of the fourth lens group drive actuator Block diagram showing the electrical configuration of the interchangeable lens The figure which shows typically the positional relationship between the 3rd lens group and the 4th lens group at a wide end. The figure which shows typically the positional relationship between the 3rd lens group and the 4th lens group at the telephoto end. A block diagram mainly showing a first embodiment of a lens control unit of an interchangeable lens. Flowchart showing the procedure for selecting position control calculation parameters Bode plot of the amplitude characteristics of VCM56 Bode plot of the phase characteristics of VCM56 Waveform diagram showing the response characteristics of the first lens G3a to the step-like target command value A. A block diagram showing a second embodiment of a lens control unit of an interchangeable lens. A block diagram showing a third embodiment of a lens control unit of an interchangeable lens. The figure which schematically showed the operation of the 3rd Embodiment A block diagram showing a fourth embodiment of a lens control unit of an interchangeable lens. A block diagram showing a fifth embodiment of a lens control unit of an interchangeable lens. Flow chart showing the embodiment of the lens control method External view of a smartphone according to an embodiment of the imaging device of the present invention Block diagram showing the configuration of a smartphone

Hereinafter, preferred embodiments for carrying out the present invention will be described in detail in accordance with the accompanying drawings.

Here, a case where the present invention is applied to an interchangeable lens (lens lens barrel) of an interchangeable lens camera will be described as an example. This type of interchangeable lens is detachably attached to the camera body via a mount.

FIG. 1 is a plan view showing an embodiment of an interchangeable lens to which the present invention is applied. FIG. 2 is a rear view (viewed from the mount side) of the interchangeable lens shown in FIG. FIG. 3 is a 3-3 cross-sectional view of FIG. 2 when the zoom operation is performed to the wide end. FIG. 4 is a 4-4 cross-sectional view of FIG. 2 when the zoom operation is performed to the wide end. FIG. 5 is a 4-4 cross-sectional view of FIG. 2 when the zoom operation is performed to the telephoto end. FIG. 6 is a cross-sectional view taken along the line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along the line 7-7 of FIG.

The interchangeable lens 1 of the present embodiment is a so-called zoom lens, and the focal length is continuously changed by the zoom operation. The interchangeable lens 1 includes a lens barrel body 10 to which the lens is assembled and an exterior body 2 that covers the outer periphery of the lens barrel body 10.

[Exterior body]
The exterior body 2 has a cylindrical shape, accommodates the lens barrel body 10 inside, and covers the outer periphery of the lens barrel body 10. The exterior body 2 is provided with a focus ring 3 which is a focus operation member, a zoom ring 4 which is a zoom operation member, and an aperture ring 5 which is an aperture operation member. The focus of the interchangeable lens 1 is manually adjusted by rotating the focus ring 3. Further, by rotating the zoom ring 4, the focal length continuously changes within a predetermined range. Further, by rotating the aperture ring 5, the aperture value (F value) can be switched in a predetermined step.

[Lens barrel body]
The lens barrel body 10 is an example of a lens lens barrel. The lens barrel body 10 has a fixed cylinder 12 and a cam cylinder 14. The cam cylinder 14 is fitted to the inner peripheral portion of the fixed cylinder 12, and the inner peripheral portion of the fixed cylinder 12 is rotatably held in the circumferential direction.

The fixed cylinder 12 has a mount 16 at its rear end (end on the image plane side). The mount 16 is composed of a so-called bayonet mount.

The cam cylinder 14 is connected to the zoom ring 4 via a connecting member (not shown). Therefore, when the zoom ring 4 is rotated, the cam cylinder 14 also rotates in conjunction with the rotation.

[Lens configuration]
A plurality of lenses are arranged inside the fixed cylinder 12. Specifically, the first lens group G1, the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group constituting the zoom lens are sequentially arranged along the optical axis Z from the object side. G5 is placed. Each lens group is composed of at least one lens.

Further, a diaphragm St is arranged inside the fixed cylinder 12. The aperture St is arranged between the first lens group G1 and the second lens group G2.

FIG. 8 is a diagram showing a moving state of each lens group when the zoom operation is performed. In the figure, (A) shows the lens arrangement at the wide end, and (B) shows the lens arrangement at the tele end. The curves indicated by the symbols AL1 to AL4 indicate the movement locus of the lens group (zoom group) that is moved by the zoom operation. Specifically, the reference numeral AL1 is the movement trajectory of the first lens group G1, the reference numeral AL2 is the movement trajectory of the second lens group G2, the reference numeral AL3 is the movement trajectory of the third lens group G3, and the reference numeral AL4 is the fourth lens group G4. It shows the movement trajectory.

As shown in FIG. 8, the first lens group G1 to the fourth lens group G4 are lens groups that move with respect to the image plane Sim by the zoom operation. On the other hand, the fifth lens group G5 is a lens group fixed with respect to the image plane Sim by the zoom operation. The aperture St moves integrally with the second lens group G2.

As shown in FIG. 8, the third lens group G3 is composed of a third lens group front group G3a and a third lens group rear group G3b. The third lens group front group G3a is a lens group for correcting curvature of field, and corrects curvature of field by moving along the optical axis Z. Therefore, the third lens group front group G3a is configured to be movable independently of the other lens groups.

Further, the fourth lens group G4 is a lens group for adjusting the focus, and adjusts the focus by moving along the optical axis Z. Therefore, the fourth lens group G4 is configured to be movable independently of the other lens groups.

The movement of each lens group by the zoom operation is realized by the cam mechanism. The cam mechanism converts the rotation of the cam cylinder 14 into a linear motion to move each lens group along the optical axis Z. In the interchangeable lens 1 of the present embodiment, the cam mechanism is composed of a fixed cylinder 12 having a straight groove, a cam cylinder 14 having a cam groove, and a cam follower provided in a holding frame of each lens group. The lens. Each lens group of the first lens group G1 to the fourth lens group G4 moves along a predetermined movement locus AL1 to AL4 by a cam mechanism. The cam mechanism is an example of a unit drive unit.

[Holding structure of each lens group]
<< 1st lens group >>
As shown in FIGS. 3, 4 and 5, the first lens group G1 is held by the first lens group holding frame 20 and arranged in the fixed cylinder 12, and the optical axis Z in the fixed cylinder 12. It is movably supported in the direction parallel to.

The first lens group holding frame 20 is provided with three first lens group driving cam followers 32 on the outer peripheral portion thereof. The three first lens group driving cam followers 32 are arranged at equal intervals in the circumferential direction. Each first lens group driving cam follower 32 is fitted into the first lens group driving cam groove 14A provided in the cam cylinder 14 and the first lens group driving straight groove 12A provided in the fixed cylinder 12, respectively. ..

With the above configuration, the first lens group G1 is held in the fixed cylinder 12. Further, when the cam cylinder 14 is rotated by the zoom ring 4, the first lens group G1 moves along the optical axis Z in the fixed cylinder 12 by the action of the cam mechanism.

<< 2nd lens group >>
As shown in FIGS. 3, 4 and 5, the second lens group G2 is held by the second lens group holding frame 22 and arranged in the fixed cylinder 12, and the optical axis Z in the fixed cylinder 12. It is movably supported in the direction parallel to.

The second lens group holding frame 22 is provided with three second lens group driving cam followers 34 on the outer peripheral portion thereof. The three second lens group driving cam followers 34 are arranged at equal intervals in the circumferential direction. Each second lens group driving cam follower 34 is fitted into the second lens group driving cam groove 14B provided in the cam cylinder 14 and the second lens group driving straight groove 12B provided in the fixed cylinder 12, respectively. ..

With the above configuration, the second lens group G2 is held in the fixed cylinder 12. Further, when the cam cylinder 14 is rotated by the zoom ring 4, the second lens group G2 moves along the optical axis Z in the fixed cylinder 12 by the action of the cam mechanism.

As shown in FIGS. 3, 4 and 5, the diaphragm unit 30 constituting the diaphragm St is assembled to the second lens group holding frame 22. As a result, the diaphragm St is arranged in the fixed cylinder 12 and moves together with the second lens group G2.

<< Third lens group >>
As shown in FIGS. 3, 4, 5, and 6, the third lens group G3 is held by the third lens group holding frame 24, arranged in the fixed cylinder 12, and inside the fixed cylinder 12. It is movably supported in a direction parallel to the optical axis Z.

The third lens group holding frame 24 is composed of a third lens group base holding frame 24A and a third lens group movable holding frame 24B held by the third lens group base holding frame 24A. The third lens group movable holding frame 24B is arranged in the third lens group base holding frame 24A, and is movably supported in the third lens group base holding frame 24A in a direction parallel to the optical axis Z. The third lens group front group G3a is held by the third lens group movable holding frame 24B. The rear group G3b of the third lens group is held by the third lens group base holding frame 24A.

The third lens group base holding frame 24A is provided with three third lens group driving cam followers 36 on the outer peripheral portion thereof. The three third lens group driving cam followers 36 are arranged at equal intervals in the circumferential direction. Each third lens group driving cam follower 36 is fitted into the third lens group driving cam groove 14C provided in the cam cylinder 14 and the third lens group driving straight groove 12C provided in the fixed cylinder 12, respectively. .. As a result, the third lens group base holding frame 24A is held in the fixed cylinder 12. Further, when the cam cylinder 14 is rotated by the zoom ring 4, the third lens group base holding frame 24A moves in the fixed cylinder 12 along the optical axis Z.

A first main shaft 48 and a first sub-shaft 50 are provided in the third lens group base holding frame 24A. The first main shaft 48 and the first sub-axis 50 are respectively arranged along the optical axis Z (see FIG. 3). Further, the first main shaft 48 and the first sub-shaft 50 are arranged at positions facing each other with the optical axis Z interposed therebetween (see FIG. 6). More specifically, it is arranged on a straight line passing through the optical axis Z in a cross section orthogonal to the optical axis Z.

The third lens group movable holding frame 24B includes a first main guide portion 52 that slides along the first main shaft 48 and a first sub guide portion 54 that slides along the first sub shaft 50. The third lens group movable holding frame 24B is slidably supported by the first main shaft 48 and the first sub shaft 50 via the first main guide portion 52 and the first sub guide portion 54.

FIG. 9 is a cross-sectional view showing a support structure of the third lens group movable holding frame and the fourth lens group movable holding frame.

As shown in the figure, the first main guide portion 52 has a tubular shape and has sliding portions 52A at both ends in the axial direction thereof. The sliding portion 52A has an inner diameter corresponding to the outer diameter of the first spindle 48. In the first main guide portion 52, the sliding portions 52A at both ends slide along the first main shaft 48.

The first sub-guide portion 54 has a U-shaped groove portion 54A at its tip. The first sub-guide portion 54 slides along the first sub-shaft 50 by fitting the first sub-shaft 50 into the groove portion 54A.

In the third lens group movable holding frame 24B, the first main guide portion 52 is slidably supported by the first main shaft 48, and the first sub guide portion 54 is slidably supported by the first sub shaft 50. As a result, the lens group base holding frame 24A is movably supported along the optical axis Z.

The third lens group movable holding frame 24B moves along the optical axis Z in the third lens group base holding frame 24A by being driven by the third lens group front group driving actuator 56. The third lens group front group drive actuator 56 is an example of the first actuator. Further, the third lens group front group G3a is an example of the first optical element.

The third lens group front group drive actuator 56, which functions as a first movable unit for moving the first lens (third lens group front group G3a) constituting the zoom lens in the direction of the optical axis of the zoom lens, is moving. It is composed of a magnet type (movable magnet type) voice coil motor (VCM). The moving magnet type VCM is a type of VCM in which the magnet moves in the magnetic field created by the yoke and the coil. The VCM is one of the electromagnetic actuators using electromagnetic force. A plurality of driving magnets (first magnets) 56A and a plurality of inner yokes 56B configured by the moving magnet type VCM are arranged on the third lens group movable holding frame 24B which is a movable portion. Further, a driving coil 56C (first coil) constituting a moving magnet type VCM and a plurality of outer yokes 56D are arranged on the third lens group base holding frame 24A which is a fixed portion.

FIG. 10 is a cross-sectional view showing a mounting structure of a third lens group front group drive actuator.

As shown in the figure, the drive coil 56C is wound so as to surround the outer peripheral portion of the third lens group movable holding frame 24B, and is attached to the inner peripheral portion of the third lens group base holding frame 24A. The third lens group movable holding frame 24B moves inside the driving coil 56C along the optical axis Z.

The plurality of driving magnets 56A are grouped and arranged in two groups. Specifically, the two groups are arranged symmetrically with respect to the straight line L passing through the optical axis Z in a cross section orthogonal to the optical axis Z. The first main shaft 48 and the first sub-shaft 50 are arranged on the straight line L. Therefore, the two groups of the driving magnets 56A are symmetrically arranged with respect to the straight line L passing through the first main shaft 48 and the first sub-shaft 50.

In the present embodiment, six drive magnets 56A are provided, and the six drive magnets 56A are arranged in two groups. Therefore, each group is provided with three driving magnets 56A. The driving magnets 56A of each group are arranged at equal intervals along the peripheral surface of the third lens group movable holding frame 24B.

The plurality of inner yokes 56B are arranged corresponding to the driving magnets 56A. Each inner yoke 56B is integrated with the corresponding drive magnet 56A and attached to the third lens group movable holding frame 24B.

The plurality of outer yokes 56D are arranged corresponding to the plurality of inner yokes 56B. Each outer yoke 56D is arranged so as to face the corresponding inner yoke 56B with the drive coil 56C interposed therebetween.

With the above configuration, the third lens group G3 is held in the fixed cylinder 12. Further, when the cam cylinder 14 is rotated by the zoom ring 4, the third lens group G3 moves along the optical axis Z in the fixed cylinder 12 by the action of the cam mechanism. That is, the front group G3a of the third lens group and the rear group G3b of the third lens group integrally move in the fixed cylinder 12 along the optical axis Z. Further, when the third lens group front group drive actuator 56 is driven, the third lens group front group G3a moves independently along the optical axis Z. The curvature of field is corrected by moving the third lens group front group G3a alone by the third lens group front group drive actuator 56.

<< 4th lens group >>
As shown in FIGS. 3, 4, 5, and 7, the fourth lens group G4 is held by the fourth lens group holding frame 26, arranged in the fixed cylinder 12, and inside the fixed cylinder 12. It is movably supported in a direction parallel to the optical axis Z.

The fourth lens group holding frame 26 is composed of a fourth lens group base holding frame 26A and a fourth lens group movable holding frame 26B held by the fourth lens group base holding frame 26A. The fourth lens group movable holding frame 26B is arranged in the fourth lens group base holding frame 26A, and is movably supported in the fourth lens group base holding frame 26A in a direction parallel to the optical axis Z. The fourth lens group G4 is held by the fourth lens group movable holding frame 26B.

The fourth lens group base holding frame 26A is provided with three cam followers 38 for driving the fourth lens group on the outer peripheral portion thereof. The three cam followers 38 for driving the fourth lens group are arranged at equal intervals in the circumferential direction. Each fourth lens group driving cam follower 38 is fitted into the fourth lens group driving cam groove 14D provided in the cam cylinder 14 and the fourth lens group driving straight groove 12D provided in the fixed cylinder 12, respectively. .. As a result, the fourth lens group base holding frame 26A is held in the fixed cylinder 12. Further, when the cam cylinder 14 is rotated by the zoom ring 4, the fourth lens group base holding frame 26A moves in the fixed cylinder 12 along the optical axis Z.

A second main shaft 58 and a second sub-shaft 60 are provided in the fourth lens group base holding frame 26A. The second main shaft 58 and the second sub-axis 60 are respectively arranged along the optical axis Z (see FIG. 3). Further, the second main shaft 58 and the second sub-shaft 60 are arranged at positions facing each other with the optical axis Z interposed therebetween (see FIG. 7). Further, the second main shaft 58 is arranged at the same position as the first main shaft 48 in the circumferential direction of the circle centered on the optical axis Z. Therefore, the second main shaft 58 and the second sub-axis 60 are arranged on the same straight line as the first main shaft 48 and the first sub-axis 50 in the cross section orthogonal to the optical axis Z. In addition, "same" here includes a range recognized as substantially the same.

The fourth lens group movable holding frame 26B includes a second main guide portion 62 that slides along the second main shaft 58 and a second sub guide portion 64 that slides along the second sub shaft 60. The fourth lens group movable holding frame 26B is slidably supported by the second main shaft 58 and the second sub shaft 60 via the second main guide portion 62 and the second sub guide portion 64.

As shown in FIG. 9, the second main guide portion 62 has a tubular shape and has sliding portions 62A at both ends in the axial direction thereof. The sliding portion 62A has an inner diameter corresponding to the outer diameter of the second main shaft 58. In the second main guide portion 62, the sliding portions 62A at both ends slide along the second main shaft 58.

The second sub-guide portion 64 has a U-shaped groove portion 64A at the tip thereof. In the second sub-guide portion 64, the groove portion 64A slides along the second sub-shaft 60.

In the fourth lens group movable holding frame 26B, the second main guide portion 62 is slidably supported by the second main shaft 58, and the second sub guide portion 64 is slidably supported by the second sub shaft 60. As a result, the lens group base holding frame 26A is movably supported along the optical axis Z.

The fourth lens group movable holding frame 26B is driven by a plurality of fourth lens group drive actuators 68. The fourth lens group drive actuator 68 is an example of the second actuator. The fourth lens group G4 is an example of the second optical element.

The fourth lens group drive actuator 68, which functions as a second movable unit for moving the second lens (fourth lens group G4) constituting the zoom lens in the direction of the optical axis of the zoom lens, is a moving coil system (movable). It is composed of a voice coil motor (VCM) 68 of a coil system). The moving coil type VCM is a type of VCM in which only the coil moves in the magnetic field created by the magnet (permanent magnet). As described above, the VCM is one of the electromagnetic actuators utilizing the electromagnetic force.

FIG. 11 is a cross-sectional view showing a mounting structure of the fourth lens group drive actuator.

The plurality of fourth lens group drive actuators 68 are grouped and arranged in two groups. Specifically, the two groups are arranged symmetrically with respect to the straight line L passing through the optical axis Z in a cross section orthogonal to the optical axis Z. The second main shaft 58 and the second sub-shaft 60 are arranged on the straight line L. Therefore, the two groups are symmetrically arranged with respect to the straight line L passing through the second spindle 58 and the second layshaft 60.

In the present embodiment, four fourth lens group drive actuators 68 are provided, and four fourth lens group drive actuators 68 are grouped and arranged in two groups. Therefore, each group includes two fourth lens group drive actuators 68. In each group, the two fourth lens group drive actuators 68 are arranged at predetermined intervals along the peripheral surface of the fourth lens group movable holding frame 26B.

Each fourth lens group drive actuator 68 includes a drive coil (second coil) 68A, a drive magnet (second magnet) 68B, an inner yoke 68C, and an outer yoke 68D.

The drive coil 68A of each fourth lens group drive actuator 68 is arranged on the fourth lens group movable holding frame 26B, which is a movable portion. The fourth lens group movable holding frame 26B has a coil holding portion 70 on the outer peripheral portion thereof, and the driving coil 68A of each fourth lens group driving actuator 68 is held by the coil holding portion 70.

The inner yoke 68C and the outer yoke 68D of the fourth lens group drive actuator 68 are arranged so as to face each other with the drive coil 68A interposed therebetween. The inner yoke 68C and the outer yoke 68D are integrally formed. In the integrally formed inner yoke 68C and outer yoke 68D, the portion of the outer yoke 68D is held by the inner peripheral portion of the fourth lens group base holding frame 26A, which is a fixed portion, and is arranged at a predetermined position.

The drive magnet 68B of each fourth lens group drive actuator 68 is attached to the inside of the outer yoke 56D and is arranged at a predetermined position. The drive magnet 68B of each fourth lens group drive actuator 68 is an example of a plurality of second drive magnets.

With the above configuration, the fourth lens group G4 is held in the fixed cylinder 12. Further, when the cam cylinder 14 is rotated by the zoom ring 4, the fourth lens group G4 moves along the optical axis Z in the fixed cylinder 12 by the action of the cam mechanism. Further, when the fourth lens group drive actuator 68 is driven, the fourth lens group G4 moves independently along the optical axis Z. Focus adjustment is performed by moving the fourth lens group G4 alone by the fourth lens group drive actuator 68.

<< Fifth lens group >>
As shown in FIGS. 3, 4 and 5, the fifth lens group G5 is held by the fifth lens group holding frame 28 and arranged in the fixed cylinder 12.

[Position detection structure of each lens group]
<< Position of each lens group by zoom operation >>
By the zoom operation, each lens group of the first lens group G1 to the fourth lens group G4 moves along a predetermined movement locus AL1 to AL4 (see FIG. 6). Therefore, the relative positional relationship (distance relationship) of each lens group by the zoom operation is known.

<< Position detection of the front group G3a of the third lens group and the G4 of the fourth lens group >>
The front group G3a of the third lens group and the fourth lens group G4 can move independently of the other lens groups. Therefore, the positions of the third lens group front group G3a and the fourth lens group G4 are separately detected. The position of the third lens group front group G3a is detected by the third lens group front group position detector (hereinafter referred to as "movable part position detector") 80, and the fourth lens group G4 is the fourth lens group. The position is detected by the position detector 90.

<Movable part position detector>
The movable portion position detector 80 detects the position of the third lens group movable holding frame 24B within the third lens group base holding frame 24A, and detects the position of the third lens group front group G3a. More specifically, the position of the third lens group movable holding frame 24B with respect to the reference position set in the third lens group base holding frame 24A is detected, and the position of the third lens group front group G3a with respect to the reference position. Is detected.

As shown in FIGS. 3 and 9, the movable portion position detector 80 is a position detector for detecting the positions of the position detection magnet 82 provided in the third lens group movable holding frame 24B and the position detection magnet 82. It is composed of 84 and. In particular, in the present embodiment, the position detector 84 is composed of a hall sensor which is a magnetic sensor. The position detector 84 composed of a hall sensor detects a magnetic field that changes according to the position of the position detection magnet 82, and outputs a signal proportional to the magnitude of the detected magnetic field as a position signal.

The position detector 84 is provided in the third lens group base holding frame 24A. As shown in FIGS. 6 and 10, the position detector 84 is arranged at the installation position of the first sub-axis 50 in a cross section orthogonal to the optical axis Z. More specifically, it is arranged on a straight line L passing through the optical axis Z and the first sub-axis 50. Further, as shown in FIGS. 3 and 9, the position detector 84 is arranged behind the first sub-axis 50 (on the image plane side) in a cross section parallel to the optical axis Z.

The position detection magnet 82 is provided on the third lens group movable holding frame 24B. The position detection magnet 82 is arranged close to the position detector 84. Specifically, as shown in FIGS. 3 and 9, in a cross section orthogonal to the optical axis Z, the first sub-guide portion 54 is arranged at the installation position and faces the position detector 84 with a predetermined gap. Is placed. As a result, the position detection magnet 82 and the position detector 84 are both arranged on a straight line L passing through the optical axis Z and the first sub-axis 50 in a cross section orthogonal to the optical axis Z.

According to the movable part position detector 80 having the above configuration, the position of the position detection magnet 82 provided on the third lens group movable holding frame 24B is detected by the position detector 84, whereby the third lens group front group The position of G3a is detected.

<4th lens group position detector>
The fourth lens group position detector 90 detects the position of the fourth lens group movable holding frame 26B within the fourth lens group base holding frame 26A, and detects the position of the fourth lens group G4. More specifically, the position of the 4th lens group movable holding frame 26B with respect to the origin position set in the 4th lens group base holding frame 26A is detected, and the position of the 4th lens group G4 with respect to the origin position is detected. To do. The fourth lens group position detector 90 is an example of the second optical element position detector.

The fourth lens group position detector 90 includes an origin position detector 92 that detects that the fourth lens group G4 is located at the origin position, a displacement amount detector 94 that detects the displacement amount of the fourth lens group G4, and the like. Consists of. The fourth lens group position detector 90 detects that the fourth lens group G4 is located at the origin position by the origin position detector 92, detects the displacement amount from the origin position by the displacement amount detector 94, and obtains the first position. 4 The position of the lens group G4 is detected.

As shown in FIGS. 7 and 11, the origin position detector 92 is composed of a shading plate 92A and a photo interrupter 92B. The light-shielding plate 92A is provided on the first main guide portion 52, and the photo interrupter 92B is provided on the fourth lens group base holding frame 26A. The origin position detector 92 detects that the fourth lens group G4 is located at the origin position by detecting the light-shielding plate 92A by the photo interrupter 92B (the fourth lens by detecting the light-shielding by the light-shielding plate 92A). It is detected that the group G4 is located at the origin position.) Therefore, the light-shielding plate 92A and the photo interrupter 92B are installed so that the light-shielding plate 92A is detected at the timing when the fourth lens group G4 is located at the origin position (at the timing when the fourth lens group G4 is located at the origin position). The light-shielding plate 92A is installed so as to shield the photo-interrupter 92B from light-shielding.)

As shown in FIGS. 3, 7, and 11, the displacement amount detector 94 is an MR sensor (Magneto Resistive Sensor) that detects the magnetic scale 94A and the north and south poles of the magnetic scale 94A. It is composed of 94B and. The MR sensor 94B is one of the magnetic sensors.

The magnetic scale 94A has a bar shape, and has a structure in which the north and south poles are magnetized at a constant pitch along the longitudinal direction thereof. The magnetic scale 94A is provided in the second main guide portion 62 and is arranged along the moving direction of the fourth lens group G4. That is, it is arranged along the optical axis Z.

The MR sensor 94B is provided in the fourth lens group base holding frame 26A. The MR sensor 94B is arranged in close proximity to the magnetic scale 94A. More specifically, as shown in FIG. 11, in a cross section orthogonal to the optical axis Z, the second main guide portion 62 is arranged at the installation position and is arranged so as to face the magnetic scale 94A with a predetermined gap. Orthogonal. As a result, the magnetic scale 94A and the MR sensor 94B are both arranged on a straight line L passing through the optical axis Z and the second main axis 58 in a cross section orthogonal to the optical axis Z.

According to the fourth lens group position detector 90 having the above configuration, the fourth lens group G4 is located at the origin position by detecting the light-shielding plate 92A provided on the second main guide portion 62 with the photo interrupter 92B. Is detected. Further, by detecting the displacement amount of the second main guide portion 62 with the MR sensor 94B via the magnetic scale 94A, the displacement amount of the fourth lens group G4 is detected. The position of the fourth lens group G4 with respect to the origin position is detected by detecting that the fourth lens group G4 is located at the origin position with the photo interrupter 92B and detecting the amount of displacement from the origin position with the MR sensor 94B. ..

<Layout of drive system for sensors>
As described above, the position detector 84 is arranged at the position of the first sub-axis 50 in the cross section orthogonal to the optical axis Z (see FIG. 10). Further, the MR sensor 94B is arranged at the position of the second main guide portion 62 in the cross section orthogonal to the optical axis Z. The position of the second main guide portion 62 is the position of the second main shaft 58 (see FIG. 11). The first spindle 48 and the first sub-axis 50 and the second spindle 58 and the second sub-axis 60 are arranged on a straight line L passing through the optical axis Z in a cross section orthogonal to the optical axis Z. Therefore, the position detector 84 and the MR sensor 94B are arranged on a straight line L passing through the optical axis Z in a cross section orthogonal to the optical axis Z.

On the other hand, in the third lens group front group drive actuator 56 that drives the third lens group front group G3a, a plurality of drive magnets 56A, a plurality of inner yokes 56B, and a plurality of outer yokes 56D, which are constituent elements thereof, form an optical axis. In a cross section orthogonal to Z, it is arranged symmetrically with respect to a straight line L passing through the optical axis Z (see FIG. 10). That is, the elements constituting the magnetic material are arranged symmetrically with respect to the straight line L passing through the optical axis Z in the cross section orthogonal to the optical axis Z.

Further, the plurality of fourth lens group drive actuators 68 for driving the fourth lens group G4 are arranged symmetrically with respect to the straight line L passing through the optical axis Z in a cross section orthogonal to the optical axis Z (see FIG. 10). ). Also in this case, the elements constituting the magnetic material are arranged symmetrically with respect to the straight line L passing through the optical axis Z in the cross section orthogonal to the optical axis Z.

As described above, in the interchangeable lens 1 of the present embodiment, the elements constituting the magnetic body are arranged symmetrically with respect to the position detector 84 and the MR sensor 94B in the cross section orthogonal to the optical axis Z. As a result, the influence of each sensor on the magnetic material can be made uniform, and more accurate detection becomes possible.

Further, in the interchangeable lens 1 of the present embodiment, the first spindle 48 and the first sub-spindle 50 are arranged on the inner diameter side of the second spindle 58 and the second sub-spindle 60. As a result, it is possible to stably support a movable lens group in a compact configuration. That is, by arranging the positions of the first spindle 48 and the first sub-spindle 50 with respect to the second spindle 58 and the second sub-spindle 60 in the radial direction, the size in the optical axis direction is increased as a whole. Without this, the lengths of the first spindle 48 and the second spindle 58 can be secured. Thereby, the front group G3a of the third lens group and the fourth lens group G4 can be stably supported. That is, by increasing the lengths of the first main shaft 48 and the second main shaft 58, the lengths of the first main guide portion 52 and the second main guide portion 62 can be increased, and the third lens group front group G3a and the fourth lens can be increased. Group G4 can be supported stably.

Even when the magnetic material is symmetrically arranged with respect to each sensor as described above, if the positional relationship with the magnetic material changes, the detection accuracy is lowered due to the influence of the change. .. In particular, since the Hall sensor is configured to detect the absolute position, if the positional relationship with the magnetic material changes, the detection accuracy is lowered due to the influence of the change. In the interchangeable lens 1 of the present embodiment, the positional relationship between the position detector 84, which is a hall sensor, and the fourth lens group drive actuator 68 changes depending on the zoom. Therefore, the output of the position detector 84 is corrected according to the change in the positional relationship due to the zoom. This point will be described in detail later.

[Electrical configuration of interchangeable lens]
FIG. 12 is a block diagram showing the electrical configuration of the interchangeable lens.

The interchangeable lens 1 includes a third lens group front group driving unit 110 that drives the third lens group front group G3a, a movable unit position detector 80 that detects the position of the third lens group front group G3a, and a fourth lens group G4. The driving fourth lens group driving unit 112, the fourth lens group position detector 90 that detects the position of the fourth lens group G4, the aperture driving unit 114 that drives the aperture St, and the temperature detector that detects the temperature inside the interchangeable lens. 116, focus operation detector 118 that detects focus operation, zoom position detector 120 that detects zoom position, aperture setting detector 122 that detects aperture operation, and lens control unit 100 that comprehensively controls the overall operation of the interchangeable lens 1. To be equipped with.

The lens control unit 100 is composed of, for example, a CPU (Central Processing Unit) and a memory or the like in which a lens control program or the like is stored, and controls each part of the interchangeable lens 1 in an integrated manner according to the lens control program.

The third lens group front group drive unit 110 includes a third lens group front group drive actuator 56 and a drive circuit thereof. The third lens group front group drive unit 110 drives the third lens group front group drive actuator 56 in response to a command from the lens control unit 100, and moves the third lens group front group G3a along the optical axis Z. Let me.

The movable portion position detector 80 includes a position detector 84, and the position detector 84 detects the position of the position detection magnet 82 provided on the third lens group movable holding frame 24B to detect the position of the position detection magnet 82 in front of the third lens group. The position of group G3a is detected. The position here is a position with respect to a reference position set in the third lens group base holding frame 24A. The position detector 84 composed of a hall sensor detects a magnetic field that changes according to the position of the position detection magnet 82, and outputs a signal proportional to the magnitude of the detected magnetic field to the position signal of the third lens group front group G3a. Is output to the lens control unit 100. The lens control unit 100 processes the signal output from the position detector 84 to detect the position of the third lens group front group G3a. At this time, the position of the third lens group front group G3a is detected by performing processing in consideration of the positional relationship between the position detector 84 and the fourth lens group drive actuator 68.

The fourth lens group drive unit 112 includes a plurality of fourth lens group drive actuators 68 and a drive circuit thereof. The fourth lens group drive unit 112 drives each fourth lens group drive actuator 68 in response to a command from the lens control unit 100, and moves the fourth lens group G4 along the optical axis Z.

The fourth lens group position detector 90 includes an origin position detector 92 and a displacement amount detector 94. The origin position detector 92 includes a photo interrupter 92B and detects that the fourth lens group G4 is located at the origin position. Further, the displacement amount detector 94 includes an MR sensor 94B and detects the displacement amount of the fourth lens group G4. The position of the fourth lens group G4 is detected by detecting that the fourth lens group G4 is located at the origin position by the origin position detector 92 and detecting the displacement amount from the origin position by the displacement amount detector 94. The lens.

The diaphragm drive unit 114 includes a diaphragm drive actuator (not shown) for driving the diaphragm St, and a drive circuit thereof. The diaphragm drive actuator is composed of, for example, a step motor. The aperture drive unit 114 drives the aperture drive actuator in response to a command from the lens control unit 100 to expand or contract the aperture St.

The temperature detector 116 includes a temperature sensor (not shown), and the temperature sensor detects the temperature inside the interchangeable lens. The temperature sensor is provided in, for example, the diaphragm unit 30. The temperature detector 116 outputs the temperature information in the interchangeable lens detected by the temperature sensor to the lens control unit 100.

The focus operation detector 118 detects the amount of rotation operation of the focus ring 3 and outputs the detection result to the lens control unit 100. The lens control unit 100 detects the amount of focus operation based on the output from the focus operation detector 118.

The zoom position detector 120 detects the set position of the zoom ring 4 and outputs the detection result to the lens control unit 100. The lens control unit 100 detects the zoom position (focal length set value) based on the output from the zoom position detector 120.

The aperture setting detector 122 detects the set position of the aperture ring 5 and outputs the detection result to the lens control unit 100. The lens control unit 100 detects the set aperture value (F value) based on the output from the aperture setting detector 122. The aperture value that can be set includes auto, and when auto is selected, the aperture value is set based on an instruction from the camera body.

The lens control unit 100 controls the operation of each unit based on the operations of the focus ring 3, the zoom ring 4, and the aperture ring 5. Specifically, when the manual focus is set, the fourth lens group drive actuator 68 is driven and the fourth lens group G4 is moved based on the rotation operation amount of the focus ring 3. At this time, the fourth lens group G4 is moved based on the position of the fourth lens group G4 detected by the fourth lens group position detector 90.

Further, the third lens group front group drive actuator 56 and the fourth lens group drive actuator 68 are driven based on the zoom position changed by the operation of the zoom ring 4, and the third lens group front group G3a and the fourth lens group G4 are driven. To a predetermined position. At this time, the third lens group front group G3a is moved to a predetermined position based on the position of the third lens group front group G3a detected by the movable portion position detector 80. Further, the fourth lens group G4 is moved to a predetermined position based on the position of the fourth lens group G4 detected by the fourth lens group position detector 90.

Further, the aperture drive unit 114 is driven to operate the aperture St based on the aperture value switched by the operation of the aperture ring 5.

Further, the lens control unit 100 controls the operation of each unit in response to a command from the camera to which the interchangeable lens 1 is mounted. For example, based on the autofocus information from the camera, the fourth lens group drive actuator 68 is driven to move the fourth lens group G4 to a predetermined position. Further, based on the aperture setting information from the camera, the aperture drive unit 114 is driven to operate the aperture St.

The lens control unit 100 communicates with the camera control unit 131 of the camera and receives a drive command for each unit from the camera control unit 131. Further, zoom setting information, aperture setting information, focus position information, and the like are transmitted to the camera control unit 131. Communication between the lens control unit 100 and the camera control unit 131 is performed via the terminal 16A provided on the mount 16 (see FIG. 2).

Further, the lens control unit 100 drives the third lens group front group drive actuator 56 based on the temperature detected by the temperature sensor, and moves the third lens group front group G3a to a predetermined position. As a result, the curvature of field caused by the temperature change is corrected.

The lens control unit 100 is composed of, for example, a computer equipped with a CPU (CPU: Central Processing Unit), a ROM (ROM: Read Only Memory), and a RAM (RAM: Random Access Memory), and by executing a predetermined program. , Realize various control functions.

FIG. 13 is a diagram schematically showing the positional relationship between the third lens group and the fourth lens group at the wide end, and FIG. 14 is a diagram showing the positional relationship between the third lens group and the fourth lens group at the telephoto end. It is a figure which shows typically.

The third lens group G3 and the fourth lens group G4 are lens groups adjacent to each other. Further, the third lens group G3 and the fourth lens group G4 are both lens groups that move by zoom operation. However, the amount of movement by zooming is different from each other. Therefore, the relative positional relationship between the third lens group G3 and the fourth lens group G4 changes depending on the zoom operation. Specifically, the position gradually changes from the wide end toward the tele end (see FIG. 8). Therefore, the third lens group G3 and the fourth lens group G4 are closest to each other at the wide end (see FIG. 13) and farthest from each other at the telephoto end (see FIG. 14).

The lens control unit 100 functions as a relative position acquisition unit that acquires a relative position between the third lens group movable holding frame 24B and the fourth lens group movable holding frame 26B based on the output from the zoom position detector 120.

In the case of the third lens group front group drive actuator 56 which is a moving magnet type VCM, the yoke having the drive magnet 56A and another magnetic material (in this example, the drive magnet 68B of the fourth lens group movable holding frame 26B). (Inner yoke 68C and outer yoke 68D)), and if the attractive force or repulsive force fluctuates according to the relative position of the two, it may hinder high-precision drive control.

In the embodiment according to the present invention shown below, it is based on the information indicating the relative position between the driving magnet 56A of the third lens group front group driving actuator 56 and another magnetic body (yoke) acquired according to the zoom position. By correcting the current (thrust) that energizes the drive coil 56C of the front group drive actuator 56 of the third lens group, drive control can be performed with high accuracy even if a magnetic force is received from another magnetic material.

[First Embodiment]
FIG. 15 is a block diagram mainly showing a first embodiment of a lens control unit of an interchangeable lens, and particularly shows a control unit that drives and controls a third lens group front group drive actuator (hereinafter, referred to as “VCM”) 56. ing.

In FIG. 15, a zoom position detection signal is applied to the movable portion position commander 123 from the zoom position detector 120, and the movable portion position commander 123 has a position according to the zoom position indicated by the zoom position detection signal. A position command value indicating a target position for correcting curvature of field is output by the front group (hereinafter referred to as “first lens”) G3a of the three lens groups.

The position command value from the movable part position commander 123 is added to the control unit 100-1.

The control unit 100-1 is mainly composed of an adder 124 that functions as a first calculation unit, a position control calculation unit 130 that functions as a second calculation unit, a parameter selection unit 140-1, and a driver 150. There is.

The position command value is added from the movable part position commander 123 to the positive input of the adder 124, and the movable part position detector 80 indicates the current position of the first lens G3a to the negative input of the adder 124. A part position detection signal is added, and the adder 124 adds these two inputs to calculate the deviation (first operation amount) for position control of the VCM 56, and positions the deviation signal indicating the deviation. Output to the control calculation unit 130.

The parameter selection unit 140-1 includes a storage unit 142 that stores a group of position control calculation parameters according to the zoom position of the zoom lens, and selects a position control calculation parameter corresponding to the zoom position from the position control calculation parameter group. Is output to the position control calculation unit 130.

FIG. 16 is a flowchart showing a procedure for selecting a position control calculation parameter. As shown in the figure, the parameter selection unit 140-1 acquires the zoom position from the zoom position detector 120 (step S1), and stores the position control calculation parameters corresponding to the acquired zoom position in the storage unit 142. The position control calculation parameter corresponding to the zoom position is selected from the existing position control calculation parameter group (step S2). Then, the selected position control calculation parameter is output to the position control calculation unit 130, and the position control calculation parameter in the position control calculation unit 130 is set (step S3). The parameter selection unit 140-1 repeatedly executes steps S1 to S3 to sequentially update the position control calculation parameters in the position control calculation unit 130 according to the zoom position.

By the way, between the driving magnet 56A of the VCM 56 and another magnetic material (the yoke having the driving magnet 68B of the fourth lens group movable holding frame 26B), the magnetic force (attractive force or repulsive force) according to the relative position of the two. Acts, and this causes disturbance of the control system of the VCM56 of this example, which hinders high-precision drive control.

17 and 18 are Bode plots showing the amplitude characteristics and phase characteristics of the VCM 56, respectively. In FIGS. 17 and 18, T indicates a drive characteristic when the zoom position is at the tele end, and W indicates a drive characteristic when the zoom position is at the wide end.

As shown in FIGS. 17 and 18, the drive characteristics of the VCM 56 differ depending on the zoom position, and the optimum position control calculation parameters at each zoom position differ.

Returning to FIG. 15, the position control calculation unit 130 sets a second manipulated variable (command value indicating magnetic force) for reducing the deviation corresponding to the deviation signal (first manipulated variable) input from the adder 124. The calculation is performed and output to the driver 150, but the second operation amount is calculated (corrected) by switching the position control calculation parameter according to the zoom position input from the parameter selection unit 140-1.

As a result, the driving magnet 56A of the VCM 56 cancels the magnetic force received from other magnetic materials, enabling highly accurate drive control. As the position control calculation parameters, parameters of a proportional element that reduces the current deviation, parameters of an integral element that reduces the accumulation of deviations, and parameters of a differential element that reduces fluctuations in deviation can be considered. Further, when a steady-state deviation is generated by a magnetic force that becomes a disturbance, a parameter for canceling (correcting the deviation) this steady-state deviation can be considered.

The driver 150 causes a current corresponding to the second operation amount (command value) input from the position control calculation unit 130 to flow through the VCM 56 (driving coil 56C), and the VCM 56 moves the first lens G3a, which is a movable portion, to the target position. Move to.

FIG. 19 is a waveform diagram showing the response characteristics of the first lens G3a to the step-shaped target command value A.

In FIG. 19, the waveform B shows the response when a positive magnetic force (attractive force) acts on the driving magnet 56A of the VCM 56, and the waveform C shows the response when the magnetic force does not act, and the waveform D shows. Shows the response when a negative magnetic force (repulsive force) acts.

According to the first embodiment of this example, good driving performance (for example, the characteristic shown in the waveform C) can be ensured by switching to the optimum position control calculation parameter according to the zoom position.

[Second Embodiment]
FIG. 20 is a block diagram mainly showing a second embodiment of a lens control unit of an interchangeable lens, and particularly shows a control unit that drives and controls the VCM 56. In the second embodiment shown in FIG. 20, the same reference numerals are given to the parts common to the first embodiment shown in FIG. 15, and detailed description thereof will be omitted.

In the control unit 100-2 of the second embodiment shown in FIG. 20, the parameter selection unit 140-2 is different from the parameter selection unit 140-1 of the first embodiment.

That is, a zoom position detection signal indicating the zoom position is applied to the parameter selection unit 140-2 from the zoom position detector 120, and the movable unit position indicating the current position of the first lens G3a from the movable unit position detector 80 A detection signal has been added.

The parameter selection unit 140-2, which functions as a relative position information acquisition unit, has a zoom position from the position control calculation parameter group stored in the storage unit 142 based on the zoom position detection signal and the movable unit position detection signal. And the position control calculation parameter corresponding to the movable part position is selected.

That is, the relative position of the driving magnet 56A of the VCM 56 and the other magnetic material (the yoke having the driving magnet 68B of the fourth lens group movable holding frame 26B) is from the current zoom position as in the first embodiment. Although it can be inferred, according to the second embodiment, since the current position of the first lens G3a is acquired in addition to the current zoom position, more accurate relative position information can be acquired.

[Third Embodiment]
FIG. 21 is a block diagram mainly showing a third embodiment of a lens control unit of an interchangeable lens, and particularly shows a control unit that drives and controls the VCM 56. In the third embodiment shown in FIG. 21, the same reference numerals are given to the parts common to the first embodiment shown in FIG. 15, and detailed description thereof will be omitted.

In the control unit 100-3 of the third embodiment shown in FIG. 21, an adder 132 is provided between the position control calculation unit 130 and the driver 150, and a magnetic force (attractive force) applied as a disturbance by the adder 132 as described later. And repulsive force) are offset.

In FIG. 21, a zoom position detection signal indicating the zoom position is applied to the magnetic force calculation unit 160-1 from the zoom position detector 120, and the movable unit position detector 80 indicates the current position of the first lens G3a. A part position detection signal is added.

Based on these zoom position detection signals and movable unit position detection signals, the magnetic force calculation unit 160-1 uses the drive magnet 56A of the VCM 56 and another magnetic material (the drive magnet 68B of the fourth lens group movable holding frame 26B). The position relative to the yoke) is specified, and the magnetic force from another magnetic material that affects the driving magnet 56A is calculated. The magnetic force from another magnetic material that affects the driving magnet 56A is small when the distance between the two is large, and large when the distance between the two is short. Further, the magnetic force from another magnetic material that affects the driving magnet 56A is measured in advance according to the zoom position and the movable part position (relative position), and a table or calculation formula based on the measurement result is obtained to zoom. The corresponding magnetic force can be read from the table based on the position and the position of the movable part, or the magnetic force can be calculated by a calculation formula.

A movable part position detection signal indicating the current position of the first lens G3a is added to the thrust constant calculation unit 170-1 from the movable part position detector 80, and the thrust constant calculation unit 170-1 is the first. The thrust constant (the magnitude of the thrust generated per unit current flowing through the drive coil 56C) is calculated according to the current position of the lens G3a (that is, the position of the drive magnet 56A). As the thrust constant, a value corresponding to the position of the driving magnet 56A determined by the VCM 56 can be used.

A signal indicating the magnetic force calculated by the magnetic force calculation unit 160-1 and a signal indicating the thrust constant calculated by the thrust constant calculation unit 170-1 are added to the offset output calculation unit 180 to calculate the offset output. Based on these input signals, the unit 180 calculates a canceling output (current value) for canceling the magnetic force from another magnetic material that affects the driving magnet 56A.

The position control calculation unit 130 inputs a deviation signal (first operation amount) indicating a position deviation 125 (deviation between the position command value and the current position of the first lens G3a), and performs a second operation from the deviation signal. A quantity (command value indicating magnetic force) is calculated and output to the adder 132.

The offset output (current value) calculated by the offset output calculation unit 180 is added to the other inputs of the adder 132, and the adder 132 adds the offset output to the second manipulated variable. The second operation amount is corrected. The second manipulated variable corrected by the adder 132 is output to the driver 150.

The driver 150 adds an output 182 (current / voltage) corresponding to the second manipulated variable corrected by the adder 132 to the VCM 56. As a result, a current corresponding to the corrected second manipulated variable flows through the driving coil 56C of the VCM 56, and the first lens G3a, which is a movable portion, is not affected by the magnetic force that causes disturbance (disturbance). The drive is controlled (so that the magnetic force that becomes) is canceled.

FIG. 22 is a diagram schematically showing the operation of the third embodiment.

In FIG. 22, each symbol is as follows.

F, L: Force required to drive the target G, F: Output of the control unit (output when there is no magnetic force or before canceling the influence of the magnetic force)
H: Magnetic force that causes disturbance I: Aggregate force that the first lens G3a, which is a movable part, receives (the output of the control unit and the magnetic force that causes disturbance)
J: Output that cancels the magnetic force that causes disturbance (absolute value is the same as H)
K: Output of the control unit (output when canceling the influence of magnetic force)

[When there is no magnetic force]
When there is no magnetic force that causes disturbance, the output of the control unit matches the force F required to drive the target, and the target can be driven.

[When affected by magnetic force, before processing to cancel the effect of magnetic force]
The output G of the control unit is affected by the magnetic force H, and the resultant force I received by the movable unit is smaller than the output F required to drive the target.

[When affected by magnetic force, after processing to cancel the effect of magnetic force]
The output K of the control unit is the sum of the force F required to drive the target and the output J (positive or negative is different from the magnetic force H) that cancels the magnetic force.

As a result of the combined output K of the control unit being affected by the magnetic force H, the resultant force I received by the movable unit coincides with the force F required to drive the target, and the target can be driven.

[When driving in the opposite direction]
When the moving portion is driven in the direction opposite to the above case in the case of being affected by the magnetic force, the force L required to drive the target and the output J for canceling the magnetic force are in the opposite directions.

In this case, the output K of the control unit, which is the sum of the force L required to drive the target and the output J that cancels the magnetic force, is smaller than the force L required to drive the target, but as a result of being affected by the magnetic force H, The resultant force I received by the moving portion coincides with the force L required to drive the target, and the target can be driven.

As described above, according to the third embodiment, since the influence of the magnetic force that apparently becomes a disturbance is canceled, highly accurate drive control can be realized.

[Fourth Embodiment]
FIG. 23 is a block diagram mainly showing a fourth embodiment of the lens control unit of the interchangeable lens, and particularly shows the control unit that drives and controls the VCM 56. In the fourth embodiment shown in FIG. 23, the same reference numerals are given to the parts common to the third embodiment shown in FIG. 21, and detailed description thereof will be omitted.

In the control unit 100-4 of the fourth embodiment shown in FIG. 23, the magnetic force calculation unit 160-2 and the thrust constant calculation unit 170-2 mainly perform the magnetic force calculation unit 160-1 and the thrust constant calculation of the third embodiment. It is different from the part 170-1.

The leakage flux of the driving magnet 56A of the VCM 56 changes depending on the temperature inside the interchangeable lens 1, and the magnetic force with another magnetic body changes. For example, when the temperature is higher than the room temperature state, the leakage flux becomes small and the magnetic force with other magnetic materials also becomes small. On the other hand, when the temperature is lower than the room temperature state, the leakage flux becomes large and the magnetic force with other magnetic materials also becomes large.

Therefore, in the fourth embodiment, the temperature detector 116 for detecting the temperature inside the interchangeable lens is provided, and the magnetic force calculation unit 160-2 and the thrust constant calculation unit 170-2 are provided with the temperature T acquired by the temperature detector 116. The magnetic force and thrust constant are calculated (corrected) based on.

The magnetic force calculation unit 160-2 calculates the magnetic force X calculated by the temperature T with respect to the magnetic force calculated under the condition of room temperature Tr by the following equation.

[Number 1]
X = magnetic force x α (T-Tr)
Here, α is a temperature coefficient for correcting the magnetic force by temperature.

Further, the thrust constant calculation unit 170-2 calculates the thrust constant Y corrected by the temperature T with respect to the thrust constant calculated under the condition of room temperature Tr by the following equation.

[Number 2]
Y = thrust constant x β (T-Tr)
Here, β is a temperature coefficient for correcting the thrust constant by the temperature.

The offset output calculation unit 180 is from another magnetic material that affects the driving magnet 56A based on the magnetic force X and the thrust constant Y calculated by the magnetic force calculation unit 160-2 and the thrust constant calculation unit 170-2, respectively. Calculate the offset output to cancel the magnetic force.

According to the fourth embodiment, it is possible to calculate the canceling output that the magnetic force that causes disturbance cancels out regardless of the temperature inside the interchangeable lens 1.

[Fifth Embodiment]
FIG. 24 is a block diagram mainly showing a fifth embodiment of the lens control unit of the interchangeable lens, and particularly shows the control unit that drives and controls the VCM 56. In the fifth embodiment shown in FIG. 24, the same reference numerals are given to the parts common to the fourth embodiment shown in FIG. 23, and detailed description thereof will be omitted.

The control unit 100-5 of the fifth embodiment shown in FIG. 24 has a first offset processing unit 190, a second offset processing unit 192, and a parameter selection unit 140-3. It differs from the embodiment of 4.

The relative positional relationship between the third lens group G3 and the fourth lens group G4 for each zoom position when the interchangeable lens 1 is zoomed differs for each interchangeable lens 1 (individual difference). Similarly, there are individual differences in the position of the movable portion when the front group G3a (movable portion) of the third lens group is driven according to the zoom position. These individual differences (variations) mainly shift in the optical axis direction.

Therefore, in order to compensate for these individual differences, a first offset processing unit 190 and a second offset processing unit 192 are provided.

The first offset processing unit 190 is set with an offset of the zoom position corresponding to the individual difference of the interchangeable lens 1, and the first offset processing unit 190 is set to the zoom position detected by the zoom position detector 120. The offset for each individual is added and output to the magnetic force calculation unit 160-3.

Further, the second offset processing unit 192 is set with an offset of the movable portion position corresponding to the individual difference of the interchangeable lens 1, and the second offset processing unit 192 is detected by the movable portion position detector 80. An offset for each individual is added to the current position of the movable part (first lens G3a), and the offset is output to the thrust constant calculation unit 170-3.

As a result, the magnetic force calculation unit 160-3 and the thrust constant calculation unit 170-3 can calculate the magnetic force and the thrust constant without being affected by the individual difference of the interchangeable lens 1, and the offset output calculation unit 180 exchanges. The offset output that compensates for the individual difference of the lens 1 can be calculated.

Further, the parameter selection unit 140-3 acquires the offsets set in the first offset processing unit 190 and the second offset processing unit 192, respectively, and switches the position control calculation parameters based on the acquired offsets. The second operation amount that compensates for the individual difference of the interchangeable lens 1 is calculated (corrected).

[Other magnetic materials]
In the above embodiment, the driving magnet 56A of the VCM 56 is affected by the magnetic force of the inner yoke 68C and the outer yoke 68D of the moving coil type VCM68 that moves the fourth lens group G4 in the optical axis direction of the zoom lens. However, other magnetic materials are not limited to this, and for example, the camera shake correction lens (second lens) is moved in a direction orthogonal to the direction of the optical axis of the zoom lens. The magnetic material contained in the electromagnetic actuator may be another magnetic material.

[Lens control method]
FIG. 25 is a flowchart showing an embodiment of the lens control method according to the present invention.

The lens control method shown in FIG. 25 is applied to the interchangeable lens 1 (lens lens barrel) shown in FIGS. 1 to 14, and in particular, the third lens group front group G3a (movable portion) by the lens control unit 100 shown in FIG. ) Is a method of driving and controlling according to the zoom position.

In FIG. 25, the lens control unit 100 acquires the zoom position based on the output from the zoom position detector 120 (step S10).

The movable portion position commander 123 (FIG. 15) outputs a position command value indicating a target position for correcting curvature of field by the first lens G3a according to the zoom position (step S12).

The adder 124 calculates a deviation (first operation amount) for position control of the VCM 56 that drives the first lens G3a based on the position command value and the current position of the first lens G3a (step S14). ..

The lens control unit 100 acquires information indicating a relative position between the driving magnet (first magnet) 56A of the VCM 56 and another magnetic material based on the zoom position (step S16).

The lens control unit 100 corrects the first operation amount calculated in step S14 based on the acquired information indicating the relative position (step S18).

In the moving magnet type VCM 56, an attractive force or a repulsive force acts between the driving magnet 56A and another magnetic material, and the attractive force or the repulsive force fluctuates according to the relative position of the two. The first operation amount is corrected so as to cancel each other (step S18).

As a method of correcting the first operation amount, a method of switching the position control calculation parameter used by the position control calculation unit 130 according to the zoom position as shown in FIG. 15 and the like, and a method of switching the position control calculation parameter according to the zoom position and as shown in FIG. 21 and the like. A method of canceling the influence of an apparently disturbing magnetic force by calculating an output (offset output) for canceling a disturbing magnetic force when driving the driving magnet 56A and adding this to the operation amount. There is.

The lens control unit 100 controls the drive of the VCM 56 based on the second manipulated variable, which is the first manipulated variable after the correction (step S20).

According to the above-mentioned lens control method, the influence of the magnetic force that becomes a disturbance is canceled, so that highly accurate drive control can be realized.

[Imaging device]
In the above embodiment, the interchangeable lens (lens lens barrel) has been described, but an image pickup device provided with a lens barrel, a lens-integrated image pickup device, a digital video camera, or the like may be used, and in addition to the image pickup function, other than imaging. It is also applicable to mobile devices having other functions (call function, communication function, other computer functions).

Other aspects to which the present invention can be applied include, for example, mobile phones and smartphones having a camera function, PDAs (Personal Digital Assistants), and portable game machines. Hereinafter, an example of a smartphone to which the present invention can be applied will be described.

<Smartphone configuration>
FIG. 26 shows the appearance of the smartphone 500, which is an embodiment of the imaging device of the present invention. The smartphone 500 shown in FIG. 26 has a flat-plate housing 502, and a display input in which a display panel 521 as a display unit and an operation panel 522 as an input unit are integrated on one surface of the housing 502. The unit 520 is provided. Further, the housing 502 includes a speaker 531, a microphone 532, an operation unit 540, and a camera unit 541. The configuration of the housing 502 is not limited to this, and for example, a configuration in which the display unit and the input unit are independent can be adopted, or a configuration having a folding structure or a slide mechanism can be adopted.

FIG. 27 is a block diagram showing the configuration of the smartphone 500 shown in FIG. 26. As shown in FIG. 27, as the main components of the smartphone, a wireless communication unit 510 that performs mobile wireless communication via a base station and a mobile communication network, a display input unit 520, a call unit 530, and an operation unit 540. A camera unit 541, a recording unit 550, an external input / output unit 560, a GPS (Global Positioning System) receiving unit 570, a motion sensor unit 580, a power supply unit 590, and a main control unit 501 are provided.

The wireless communication unit 510 performs wireless communication with the base station accommodated in the mobile communication network in accordance with the instruction of the main control unit 501. Using this wireless communication, various file data such as voice data and image data, transmission / reception of e-mail data, etc., and reception of Web data, streaming data, etc. are performed.

The display input unit 520 displays images (still images and moving images), character information, and the like under the control of the main control unit 501, visually conveys the information to the user, and detects the user operation for the displayed information. It is a so-called touch panel, and includes a display panel 521 and an operation panel 522.

The display panel 521 uses an LCD (Liquid Crystal Display), an OLED (Organic Electro-Luminescence Display), or the like as a display device. The operation panel 522 is a device on which an image displayed on the display surface of the display panel 521 is visibly placed and detects one or a plurality of coordinates operated by a user's finger or a stylus. When such a device is operated with a user's finger or a stylus, a detection signal generated due to the operation is output to the main control unit 501. Next, the main control unit 501 detects the operation position (coordinates) on the display panel 521 based on the received detection signal.

As shown in FIG. 26, the display panel 521 and the operation panel 522 of the smartphone 500 illustrated as one embodiment of the image pickup apparatus of the present invention integrally constitute the display input unit 520, but the operation panel The arrangement is such that the 522 completely covers the display panel 521. When such an arrangement is adopted, the operation panel 522 may also have a function of detecting a user operation in an area outside the display panel 521. In other words, the operation panel 522 has a detection area (hereinafter, referred to as a display area) for the overlapping portion overlapping the display panel 521 and a detection area (hereinafter, non-display area) for the outer edge portion not overlapping the other display panel 521. ) And may be provided.

The size of the display area and the size of the display panel 521 may be completely matched, but it is not always necessary to match the two. Further, the operation panel 522 may include two sensitive regions, an outer edge portion and an inner portion other than the outer edge portion. Further, the width of the outer edge portion is appropriately designed according to the size of the housing 502 and the like. Further, examples of the position detection method adopted in the operation panel 522 include a matrix switch method, a resistance film method, a surface acoustic wave method, an infrared method, an electromagnetic induction method, a capacitance method, and the like, and any of these methods is adopted. You can also do it.

The call unit 530 includes a speaker 531 and a microphone 532, converts the user's voice input through the microphone 532 into voice data that can be processed by the main control unit 501, and outputs the data to the main control unit 501, or a wireless communication unit. The audio data received by the 510 or the external input / output unit 560 is decoded and output from the speaker 531. Further, as shown in FIG. 26, for example, the speaker 531 and the microphone 532 can be mounted on the same surface as the surface on which the display input unit 520 is provided.

The operation unit 540 is a hardware key using a key switch or the like, and receives an instruction from the user. For example, as shown in FIG. 26, the operation unit 540 is mounted on the side surface of the housing 502 of the smartphone 500, and is turned on when pressed with a finger or the like, and turned off by a restoring force such as a spring when the finger is released. It is a push button type switch.

The recording unit 550 includes the control program, control data, application software, address data associated with the name and telephone number of the communication partner, e-mail data sent / received, Web data downloaded by Web browsing, and Web data downloaded by Web browsing. It stores downloaded content data and temporarily stores streaming data and the like. Further, the recording unit 550 is composed of an internal storage unit 551 built in the smartphone and an external storage unit 562 having a detachable external memory slot. The internal storage unit 551 and the external storage unit 552 constituting the recording unit 550 are a flash memory type, a hard disk type, a multimedia card micro type, and the like. It is realized by using a recording medium such as a card type memory (for example, Micro SD (registered trademark) memory), RAM (Random Access Memory), and ROM (Read Only Memory).

The external input / output unit 560 serves as an interface with all external devices connected to the smartphone 500, and communicates with other external devices (for example, universal serial bus (USB), IEEE1394, etc.) or Network (for example, Internet, wireless LAN (Local Area Network), Bluetooth (Bluetooth) (registered trademark), RFID (Radio Frequency Identification), Infrared Data Association (IrDA) (registered trademark), UWB (Ultra Wideband) ( (Registered trademark), ZigBee (registered trademark), etc.) for direct or indirect connection.

Examples of external devices connected to the smartphone 500 include a presence / wireless headset, a presence / wireless external charger, a presence / wireless data port, a memory card connected via a card socket, and a SIM (Subscriber). External audio / video device connected via Identity Module Card) / UIM (User Identity Module Card) card or audio / video I / O (Input / Output) terminal, external audio / video device connected wirelessly, Yes / Wireless There are smartphones to be connected, personal computers to be connected / wirelessly connected, PDAs to be connected / wirelessly connected, earphones, and the like. The external input / output unit can transmit the data transmitted from such an external device to each component inside the smartphone 500, or can transmit the data inside the smartphone 500 to the external device.

The GPS receiving unit 570 receives GPS signals transmitted from the GPS satellites ST1 to STn according to the instruction of the main control unit 501, executes positioning calculation processing based on the received plurality of GPS signals, and determines the latitude of the smartphone 500. Detects the position consisting of longitude and altitude. When the GPS receiving unit 570 can acquire the position information from the wireless communication unit 510 or the external input / output unit 560 (for example, wireless LAN), the GPS receiving unit 570 can also detect the position using the position information.

The motion sensor unit 580 includes, for example, a three-axis acceleration sensor and a gyro sensor, and detects the physical movement of the smartphone 500 according to the instruction of the main control unit 501. By detecting the physical movement of the smartphone 500, the moving direction and acceleration of the smartphone 500 are detected. This detection result is output to the main control unit 501.

The power supply unit 590 supplies electric power stored in a battery (not shown) to each unit of the smartphone 500 according to the instruction of the main control unit 501.

The main control unit 501 includes a microprocessor, operates according to the control program and control data stored in the recording unit 550, and controls each unit of the smartphone 500 in an integrated manner. Further, the main control unit 501 includes a mobile communication control function and an application processing function that control each unit of the communication system in order to perform voice communication and data communication through the wireless communication unit 510.

The application processing function is realized by operating the main control unit 501 according to the application software stored in the recording unit 550. Examples of the application processing function include an infrared communication function that controls an external input / output unit 560 to perform data communication with an opposite device, an e-mail function that sends and receives e-mail, a web browsing function that browses a web page, and the present invention. There is an image processing function for performing HDR composition related to the above.

Further, the main control unit 501 has an image processing function such as displaying an image on the display input unit 520 based on image data (still image or moving image data) such as received data or downloaded streaming data. The image processing function refers to a function in which the main control unit 501 decodes the image data, performs image processing on the decoding result, and displays the image on the display input unit 520.

Further, the main control unit 501 executes display control for the display panel 521 and operation detection control for detecting a user operation through the operation unit 540 and the operation panel 522.

By executing the display control, the main control unit 501 displays a software key such as an icon and a scroll bar for starting the application software, or displays a window for composing an e-mail. The scroll bar is a software key for receiving an instruction to move a display portion of an image for a large image or the like that cannot fit in the display area of the display panel 521.

Further, by executing the operation detection control, the main control unit 501 detects the user operation through the operation unit 540, operates the icon through the operation panel 522, and accepts the input of the character string in the input field of the window, or scrolls. Accepts scrolling requests for displayed images through the bar.

Further, by executing the operation detection control, the main control unit 501 has an overlapping portion (display area) in which the operation position with respect to the operation panel 522 overlaps the display panel 521, or an outer edge portion (non-display area) in which the operation position does not overlap the other display panel 521. ), And a touch panel control function that controls the sensitive area of the operation panel 522 and the display position of the software key.

Further, the main control unit 501 can detect a gesture operation on the operation panel 522 and execute a preset function according to the detected gesture operation. Gesture operation is not a conventional simple touch operation, but an operation of drawing a locus with a finger or the like, specifying a plurality of positions at the same time, or combining these to draw a locus of at least one from a plurality of positions. means.

The camera unit 541 is a digital camera that performs electronic photography using an imaging element such as a CMOS (Complementary Metal Oxide Semiconductor) or a CCD (Charge-Coupled Device), and is a zoom lens similar to the interchangeable lens 1 (lens lens barrel) described above. It has. That is, the zoom lens of the camera unit 541 constitutes the zoom lens with the first movable unit (moving magnet type VCM) that moves the first lens constituting the zoom lens in the direction of the optical axis of the zoom lens. A second movable unit (electromagnetic actuator) for moving the second lens in the direction of the optical axis of the zoom lens or in the direction orthogonal to the direction of the optical axis is provided.

Further, the camera unit 541 includes a first calculation unit that calculates a first operation amount for controlling the position of the VCM based on the position command value of the first lens and the current position of the first lens, and a first calculation unit of the VCM. It has a relative position information acquisition unit that acquires information indicating the relative position of the first magnet and another magnetic material, corrects the first operation amount based on the acquired relative position information, and corrects the first operation amount of the VCM. It is equipped with a control unit that controls the drive.

Under the control of the main control unit 501, the camera unit 541 converts the image data obtained by imaging into compressed image data such as JPEG (Joint Photographic coding Experts Group) and records it in the recording unit 550 or external input / output. It can be output through the unit 560 and the wireless communication unit 510. As shown in FIG. 26, in the smartphone 500, the camera unit 541 is mounted on the same surface as the display input unit 520, but the mounting position of the camera unit 541 is not limited to this, and is mounted on the back surface of the display input unit 520. Alternatively, a plurality of camera units 541 may be mounted. When a plurality of camera units 541 are mounted, the camera units 541 used for shooting can be switched for shooting independently, or the plurality of camera units 541 can be used at the same time for shooting.

Further, the camera unit 541 can be used for various functions of the smartphone 500. For example, the image acquired by the camera unit 541 can be displayed on the display panel 521, or the image of the camera unit 541 can be used as one of the operation inputs of the operation panel 522. Further, when the GPS receiving unit 570 detects the position, the position can be detected by referring to the image from the camera unit 541. Further, referring to the image from the camera unit 541, the optical axis direction of the camera unit 541 of the smartphone 500 is used without using the 3-axis acceleration sensor or in combination with the 3-axis acceleration sensor (gyro sensor). It is also possible to judge the current usage environment. Of course, the image from the camera unit 541 can also be used in the application software.

In addition, the position information acquired by the GPS receiving unit 570 and the voice information acquired by the microphone 532 (the voice text may be converted into the text information by the main control unit or the like) in the image data of the still image or the moving image. It is also possible to add posture information or the like acquired by the motion sensor unit 580 and record it in the recording unit 550, or output it through the external input / output unit 560 or the wireless communication unit 510.

[Other]
In the present embodiment, the case where the lens (first lens) for correcting the image plane curvature is driven and controlled by the moving magnet type VCM according to the zoom position in the lens group constituting the zoom lens has been described. The lens to be controlled is not limited to this, and can be applied to drive control of any lens as long as it is a lens driven in the direction of the optical axis of the zoom lens by a moving magnet type VCM.

Further, in the present embodiment, for example, the hardware structure of the processing unit that executes various processes of the lens control unit 100 of the interchangeable lens 1 is a various processor as shown below. is there. For various processors, the circuit configuration can be changed after manufacturing the CPU (Central Processing Unit), FPGA (Field Programmable Gate Array), etc., which are general-purpose processors that execute software (programs) and function as various processing units. Programmable Logic Device (PLD), a dedicated electric circuit, which is a processor having a circuit configuration specially designed to execute a specific process such as an ASIC (Application Specific Integrated Circuit). Is done.

One processing unit may be composed of one of these various processors, or may be composed of two or more processors of the same type or different types (for example, a plurality of FPGAs or a combination of a CPU and an FPGA). You may. Further, a plurality of processing units may be configured by one processor. As an example of configuring a plurality of processing units with one processor, first, one processor is configured by a combination of one or more CPUs and software, as represented by a computer such as a client or a server. There is a form in which the processor functions as a plurality of processing units. Secondly, as typified by System On Chip (SoC), there is a form in which a processor that realizes the functions of the entire system including a plurality of processing units with one IC (Integrated Circuit) chip is used. is there. As described above, the various processing units are configured by using one or more of the above-mentioned various processors as a hardware-like structure.

Further, the hardware structure of these various processors is, more specifically, an electric circuit (circuitry) in which circuit elements such as semiconductor elements are combined.

Furthermore, the present invention is a lens control program that functions as a lens barrel or an image pickup device according to the present invention by being installed in a lens barrel or an image pickup device (computer), and a recording in which this lens control program is recorded. Includes medium.

Further, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

1 Interchangeable lens 2 Exterior 3 Focus ring 4 Zoom ring 5 Aperture ring 10 Lens barrel body 12 Fixed cylinder 12A Straight groove for driving the first lens group 12B Straight groove for driving the second lens group 12C Straight groove for driving the third lens group 12D 4th lens group drive straight groove 14 Cam cylinder 14A 1st lens group drive cam groove 14B 2nd lens group drive cam groove 14C 3rd lens group drive cam groove 14D 4th lens group drive cam groove 16 mount 16A Terminal 20 1st lens group holding frame 22 2nd lens group holding frame 24 3rd lens group holding frame 24A 3rd lens group base holding frame 24B 3rd lens group movable holding frame 26 4th lens group holding frame 26A 4th lens group Base holding frame 26B 4th lens group movable holding frame 28 5th lens group holding frame 30 1st lens frame 30 Aperture unit 32 1st lens group driving cam follower 34 2nd lens group driving cam follower 36 3rd lens group driving cam follower 38 4th lens group drive cam follower 48 1st main shaft 50 1st sub shaft 52 1st main guide part 52A Sliding part 54 1st sub guide part 54A Groove part 56 3rd lens group front group drive actuator 56 VCM
56A Drive magnet 56B Inner yoke 56C Drive coil 56D Outer yoke 58 2nd main shaft 60 2nd sub-shaft 60 Permanent magnet 61 Permanent magnet 62 2nd main guide part 62A Sliding part 64 2nd sub-guide part 64A Groove part 68 4th Lens group drive actuator 68 VCM
68A Drive coil 68B Drive magnet 68C Inner yoke 68D Outer yoke 70 Coil holder 80 Movable part position detector 82 Position detection magnet 84 Position detector 90 Fourth lens group position detector 92 Origin position detector 92A Shading plate 92B Photo interrupter 94 Displacement detector 94A Magnetic scale 94B MR sensor 100 Lens control unit 100-1, 100-2, 100-3 Control unit 110 3rd lens group Front group drive unit 112 4th lens group drive unit 114 Aperture drive unit 116 Temperature detector 118 Focus operation detector 120 Zoom position detector 122 Aperture setting detector 123 Movable part Position commander 124 Adder 125 Deviation 130 Position control calculation unit 131 Camera control unit 132 Adder 140-1, 140-2, 140-3, 100-4, 100-5 Parameter selection unit 142 Storage unit 150 Driver 160-1, 160-2, 160-3 Magnetic force calculation unit 170-1, 170-2, 170-3 Thrust constant calculation unit 180 Cancellation Output calculation unit 182 Output 190 First offset processing unit 192 Second offset processing unit 500 Smartphone 501 Main control unit 502 Housing 510 Wireless communication unit 520 Display input unit 521 Display panel 522 Operation panel 530 Calling unit 531 Speaker 532 Microphone 540 Operation unit 541 Camera unit 550 Recording unit 551 Internal storage unit 552 External storage unit 560 External input / output unit 562 External storage unit 570 Reception unit 570 GPS reception unit 580 Motion sensor unit 590 Power supply unit AL1, AL2, AL3, AL4 Movement locus G1 1 Lens group G2 2nd lens group G3 3rd lens group G3a 3rd lens group Front group G3a 1st lens G3b 3rd lens group Rear group G4 4th lens group G5 5th lens group S1, S2, S3, S10, S12, S14, S16, S18, S20 steps

Claims (21)

A first movable unit that moves the first lens constituting the zoom lens in the direction of the optical axis of the zoom lens, and
A second movable unit that moves the second lens constituting the zoom lens in the direction of the optical axis of the zoom lens or in a direction orthogonal to the direction of the optical axis.
A control unit that controls the drive of the first movable unit is provided.
The first movable unit is a moving magnet type voice coil motor in which a first magnet is arranged in a movable portion and a first coil is arranged in a fixed portion, and the first magnet is a moving magnet type voice coil motor. A magnetic force corresponding to the relative position between the first magnet and the magnetic body included in the second movable unit is received from the magnetic body.
The control unit calculates a first operation amount for position control of the first movable unit based on a position command value of the first lens and a current position of the first lens. The first operation amount is provided with a unit and a relative position information acquisition unit that acquires information indicating the relative position of the first magnet and the magnetic body, and is based on the acquired information indicating the relative position. The lens barrel that corrects the above and controls the drive of the first movable unit. The control unit includes a second calculation unit that calculates a second operation amount that corrects the first operation amount and cancels the magnetic force that the first magnet receives from the magnetic body, and the calculated operation unit is provided. The lens barrel according to claim 1, wherein the drive of the first movable unit is controlled based on the second operation amount. The relative position information acquisition unit acquires the zoom position of the zoom lens and obtains the zoom position.
The second calculation unit calculates an output that cancels the magnetic force that the first magnet receives from the magnetic body based on the acquired zoom position, and the second operation amount is used from the calculated output. The lens barrel according to claim 2, wherein the amount of operation of the lens barrel is calculated. The claim that the relative position information acquisition unit adds a first offset indicating individual variation of the lens barrel to the zoom position of the zoom lens, and acquires a zoom position to which the first offset is added. The lens barrel according to 3. The relative position information acquisition unit acquires the zoom position of the zoom lens and the position of the movable portion of the first movable unit, respectively.
The second calculation unit calculates an output that cancels the magnetic force received by the first magnet from the magnetic body based on the acquired zoom position and the position of the movable portion, and the first calculation unit is based on the calculated output. The lens barrel according to claim 2, wherein the second operation amount is calculated from the operation amount. The relative position information acquisition unit adds a second offset indicating individual variation of the lens barrel to the position of the movable portion, and acquires the position of the movable portion to which the second offset is added. The lens barrel according to claim 5. A temperature detector for detecting the temperature inside the lens barrel is provided.
The second calculation unit according to any one of claims 3 to 6, wherein the second calculation unit corrects the output for canceling the magnetic force based on the temperature detected by the temperature detector when calculating the output for canceling the magnetic force. Lens barrel. The second calculation unit acquires the positions of the magnetic force calculation unit that calculates the magnetic force received by the first magnet from the magnetic body based on the acquired zoom position and the position of the movable unit of the first movable unit. The first coil is provided with a thrust constant calculation unit that calculates a thrust constant for energization of the first coil based on the acquired position of the movable portion, and the first magnetic force and the thrust constant are calculated based on the calculated magnetic force and the thrust constant. The lens barrel according to any one of claims 3 to 7, which calculates an output that cancels the magnetic force received by the magnet from the magnetic body. A temperature detector for detecting the temperature inside the lens barrel is provided.
The eighth aspect of the present invention, wherein the magnetic force calculation unit and the thrust constant calculation unit of the second calculation unit correct the calculated magnetic force and the thrust constant based on the temperature detected by the temperature detector, respectively. Lens barrel. A storage unit for storing position control calculation parameters according to the zoom position of the zoom lens is provided.
The relative position information acquisition unit acquires the zoom position of the zoom lens and obtains the zoom position.
The second calculation unit selects a corresponding position control calculation parameter from the storage unit based on the acquired zoom position, and the second operation from the first operation amount is performed by the selected position control calculation parameter. The lens barrel according to any one of claims 2 to 9 for calculating the amount. A storage unit for storing position control calculation parameters according to the zoom position of the zoom lens and the position of the movable portion of the first movable unit is provided.
The relative position information acquisition unit acquires the zoom position of the zoom lens and the position of the movable portion of the first movable unit, respectively.
The second calculation unit selects a corresponding position control calculation parameter from the storage unit based on the acquired zoom position and the position of the movable part, and the first operation amount is based on the selected position control calculation parameter. The lens barrel according to any one of claims 2 to 9, wherein the second operation amount is calculated from the above. The second movable unit is any one of claims 1 to 11, which is a moving coil type voice coil motor in which a second coil is disposed in the movable portion and a second magnet is disposed in the fixed portion. The lens barrel according to item 1. The lens barrel according to claim 12, wherein the magnetic material included in the second movable unit is a yoke having the second magnet. The lens barrel according to any one of claims 1 to 13, wherein the first movable unit and the second movable unit are arranged inside a zoom group that takes different movement loci by a zoom operation. An imaging device provided with the lens barrel according to any one of claims 1 to 14. A zoom lens that includes a first lens and a second lens,
A first movable unit that moves the first lens in the direction of the optical axis of the zoom lens, and
A second movable unit that moves the second lens in the direction of the optical axis of the zoom lens or in a direction orthogonal to the direction of the optical axis.
A control unit that controls the drive of the first movable unit is provided.
The first movable unit is a moving magnet type voice coil motor in which a first magnet is arranged in a movable portion and a first coil is arranged in a fixed portion, and the first magnet is a moving magnet type voice coil motor. A magnetic force corresponding to the relative position between the first magnet and the magnetic body included in the second movable unit is received from the magnetic body.
The control unit calculates a first operation amount for position control of the first movable unit based on a position command value of the first lens and a current position of the first lens. The first operation amount is provided with a unit and a relative position information acquisition unit that acquires information indicating the relative position of the first magnet and the magnetic body, and is based on the acquired information indicating the relative position. An image pickup device that corrects the above and controls the drive of the first movable unit. The control unit includes a second calculation unit that calculates a second operation amount that corrects the first operation amount and cancels the magnetic force that the first magnet receives from the magnetic body, and the calculated operation unit is provided. The imaging device according to claim 16, wherein the driving of the first movable unit is controlled based on the second operation amount. The relative position information acquisition unit acquires the zoom position of the zoom lens and obtains the zoom position.
The second calculation unit calculates an output that cancels the magnetic force that the first magnet receives from the magnetic body based on the acquired zoom position, and the second operation amount is used from the calculated output. The imaging device according to claim 17, wherein the operation amount of the above is calculated. A first movable unit that moves the first lens that constitutes the zoom lens in the direction of the optical axis of the zoom lens, and a second lens that constitutes the zoom lens are moved in the direction of the optical axis of the zoom lens. Alternatively, the first movable unit includes a second movable unit that moves in a direction orthogonal to the direction of the optical axis, and the first movable unit has a first magnet arranged in a movable portion and a first coil in a fixed portion. It is a moving magnet type voice coil motor arranged, and the first magnet exerts a magnetic force corresponding to a relative position between the first magnet and a magnetic body included in the second movable unit. In the lens control method applied to the lens barrel received from the body,
The step of outputting the position command value of the first lens and
A step of calculating a first operation amount for position control of the first movable unit based on a position command value of the first lens and a current position of the first lens.
A step of acquiring information indicating the relative position of the first magnet and the magnetic material, and
A step of correcting the first operation amount based on the acquired information indicating the relative position and controlling the drive of the first movable unit.
Lens control method including. A first movable unit that moves the first lens that constitutes the zoom lens in the direction of the optical axis of the zoom lens, and a second lens that constitutes the zoom lens are moved in the direction of the optical axis of the zoom lens. Alternatively, the first movable unit includes a second movable unit that moves in a direction orthogonal to the direction of the optical axis, and the first movable unit has a first magnet arranged in a movable portion and a first coil in a fixed portion. It is a moving magnet type voice coil motor arranged, and the first magnet exerts a magnetic force corresponding to a relative position between the first magnet and a magnetic body included in the second movable unit. In the lens control program applied to the lens barrel received from the body,
A function to output the position command value of the first lens and
A function of calculating a first operation amount for position control of the first movable unit based on a position command value of the first lens and a current position of the first lens.
A function of acquiring information indicating the relative position of the first magnet and the magnetic material, and
A function of correcting the first operation amount based on the acquired information indicating the relative position and controlling the drive of the first movable unit.
A lens control program that makes a computer realize. A non-temporary, computer-readable recording medium when the instructions stored in the recording medium are read by a computer.
A first movable unit that moves the first lens that constitutes the zoom lens in the direction of the optical axis of the zoom lens, and a second lens that constitutes the zoom lens are moved in the direction of the optical axis of the zoom lens. Alternatively, the first movable unit includes a second movable unit that moves in a direction orthogonal to the direction of the optical axis, and the first movable unit has a first magnet arranged in a movable portion and a first coil in a fixed portion. It is a moving magnet type voice coil motor arranged, and the first magnet exerts a magnetic force corresponding to a relative position between the first magnet and a magnetic body included in the second movable unit. It is a lens control function applied to the lens barrel received from the body.
A function to output the position command value of the first lens and
A function of calculating a first operation amount for position control of the first movable unit based on a position command value of the first lens and a current position of the first lens.
A function of acquiring information indicating the relative position of the first magnet and the magnetic material, and
A function of correcting the first operation amount based on the acquired information indicating the relative position and controlling the drive of the first movable unit.
A recording medium that causes a computer to perform lens control functions, including.

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