JP2016014717A - Optical element holding unit, photographic lens including the same, and photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical element holding unit capable of preferably holding an optical element which performs image blur correction driving and LPF driving, a photographic lens including the same, and a photographing device.SOLUTION: An optical element holding unit includes a lock mechanism which allows switching between a first state (unlock state) which permits both image blur correction driving and LPF driving of an optical element; a second state (half lock state) which inhibits image blur correction driving of the optical element and permits LPF driving; and a third state (full lock state) which inhibits both image blur correction driving and LPF driving of the optical element.

Description

  The present invention relates to an optical element holding unit, and a photographing lens and a photographing device having the same.

  2. Description of the Related Art Conventionally, in a photographing apparatus (digital camera or the like), a lens that forms part of a photographing optical system is used as an image blur correction lens, and the image blur correction lens is driven on the image sensor by driving image blur correction in a plane orthogonal to the optical axis. An image blur correction function for correcting image blur by displacing the imaging position of the subject image on the screen is known.

  On the other hand, in recent years, in an imaging apparatus equipped with an image blur correction function, an image blur correction lens is subjected to LPF driving (microvibration) in a plane orthogonal to the optical axis, whereby a subject luminous flux is detected in a plurality of different colors detected by the image sensor. It has been proposed to have an LPF function for obtaining an optical low-pass filter effect by entering the pixel.

  The image blur correction drive and the LPF drive of these image blur correction lenses can be performed as a combination drive, a mode where one of them is driven alone, or a mode where neither drive is performed. Further, when comparing the image blur correction drive range and the LPF drive range of the image blur correction lens, the image blur correction drive range is overwhelmingly larger than the LPF drive range.

  For this reason, in a conventional photographing apparatus having both an image blur correction function and an LPF function, an optical element holding unit capable of suitably holding an optical element that performs image blur correction driving and LPF driving is obtained. It was very difficult. That is, disadvantages such as an increase in the size of the optical element holding unit, a complicated structure, an increase in cost, an increase in power consumption, and a decrease in responsiveness to switching of driving modes cannot be avoided.

JP 2002-354336 A JP 2004-94131 A

  The present invention has been made on the basis of the above problem awareness, and provides an optical element holding unit capable of suitably holding an optical element for performing image blur correction driving and LPF driving, and a photographing lens and photographing apparatus having the optical element holding unit. The purpose is to obtain.

  An optical element holding unit of the present invention is an optical element holding unit that holds an optical element that forms at least a part of a photographing optical system that forms a subject light flux on a plurality of pixels of an image sensor as a subject image. Can be driven with a relatively large amount of movement in a direction different from the optical axis of the imaging optical system, thereby displacing the imaging position of the subject image on the image sensor to correct image blur. The optical element is driven with a relatively small amount of movement in a direction different from the optical axis of the photographing optical system, so that a subject luminous flux is made incident on a plurality of pixels of the image sensor, thereby providing an optical low-pass filter effect. A first state that allows both image blur correction driving and LPF driving of the optical element, and image blur compensation of the optical element. A lock mechanism capable of switching between a second state in which driving is prohibited and LPF driving is permitted, and a third state in which both image blur correction driving and LPF driving of the optical element are prohibited; It is characterized by.

  The optical element holding unit includes a fixing member, an optical element holding frame that holds the optical element and is supported so as to be movable in a plane orthogonal to the optical axis with respect to the fixing member, and is rotatable on the fixing member. The lock mechanism is supported, and the optical element holding frame and the lock ring cooperate to form the lock mechanism.

  The optical element holding frame has an annular rib and a plurality of protrusions projecting from the annular rib in the outer diameter direction, and the lock ring has an inner peripheral surface relative to the outer diameter direction. And a plurality of second cam recesses whose inner peripheral surfaces are relatively shallowly recessed in the outer diameter direction, and the lock mechanism includes the lock ring. The projection of the optical element holding frame is in the first state when the projection of the optical element holding frame is positioned in the first cam recess of the lock ring. Is in the second cam recess of the lock ring, the second state, and when the projection of the optical element holding frame is in contact with the inner peripheral surface of the lock ring A third state can be reached.

  The lock ring has a plurality of protrusions projecting in the inner diameter direction from the inner peripheral surface thereof, and the optical element holding frame is configured so that the annular rib and the outer peripheral surface of the annular rib are relatively in the inner diameter direction. A plurality of first cam recesses that are deeply recessed, and a plurality of second cam recesses in which the outer peripheral surface of the annular rib is relatively shallowly recessed in the inner diameter direction. In response to the rotation of the lock ring, the protrusion of the lock ring is in the first state when the protrusion of the lock ring is positioned in the first cam recess of the optical element holding frame. Is in the second cam recess of the optical element holding frame, the second state is established, and the protrusion of the lock ring contacts the outer peripheral surface of the annular rib of the optical element holding frame. When in contact, the third state can be reached.

  In the third state, the lock mechanism can hold the optical element at the center position between the image blur correction drive range and the LPF drive range.

  The photographic lens of the present invention includes a photographic optical system that forms a subject light beam on a plurality of pixels of an image sensor as a subject image; and an optical element holding unit that holds an optical element that forms at least a part of the photographic optical system. A photographic lens, wherein the optical element is driven by a relatively large amount of movement in a direction different from the optical axis of the photographic optical system, thereby displacing the imaging position of the subject image on the image sensor and image blurring Image blur correction drive is possible; the optical element is driven in a direction different from the optical axis of the photographing optical system with a relatively small amount of movement, whereby the subject luminous flux is applied to a plurality of pixels of the image sensor. LPF driving to obtain an optical low-pass filter effect upon incidence is possible; and the optical element holding unit is configured to perform image blur correction driving and LP of the optical element. A first state in which both driving are allowed, a second state in which image blur correction driving of the optical element is prohibited and LPF driving is allowed, and both image blur correction driving and LPF driving of the optical element are prohibited. A locking mechanism that can be switched between the third state and the third state.

  An image pickup apparatus according to the present invention includes an image sensor having a plurality of pixels that form a subject light flux that has passed through a shooting optical system as a subject image; and an optical element holding unit that holds an optical element that forms at least a part of the shooting optical system. An imaging device having a displacement of a subject image on the image sensor by driving the optical element in a direction different from the optical axis of the imaging optical system with a relatively large amount of movement. An image blur correction drive that corrects the image blur by driving the optical element in a direction different from the optical axis of the photographing optical system with a relatively small amount of movement, so that a plurality of light fluxes of the subject can be obtained. LPF driving to obtain an optical low-pass filter effect by being incident on the pixel of the optical element; and the optical element holding unit is configured to correct image blur of the optical element. Both the first state in which both of the optical element and the LPF drive are allowed, the second state in which the image blur correction drive of the optical element is prohibited and the LPF drive is allowed, and both the image blur correction drive and the LPF drive of the optical element A lock mechanism that is switchable between a third state and a third state.

  According to the present invention, an optical element holding unit capable of suitably holding an optical element that performs image blur correction driving and LPF driving, and a photographing lens and a photographing apparatus having the optical element holding unit are obtained.

It is a schematic perspective view which shows the external appearance structure of the digital camera (imaging device) by this invention. FIG. 3 is a partial exploded perspective view of an image shake correction unit (moving optical element holding unit) according to the present invention as viewed from the subject side. It is an expanded sectional view along the longitudinal direction of a post in the state where an image blur correction unit (moving optical element holding unit) according to the present invention is assembled. It is a figure which shows the LPF drive which obtains an optical low-pass filter effect by driving an image blur correction lens (moving optical element) so that a circular locus may be drawn in an optical axis orthogonal plane. It is a figure which compares and shows the image blur correction drive range and LPF drive range of an image blur correction lens (moving optical element). 6A to 6C are diagrams showing switching of the lock state of the lock mechanism according to the rotation position of the lock ring, and FIG. 6A is a first state (unlock) of the lock mechanism. State), FIG. 6B shows a second state (half-locked state) of the locking mechanism, and FIG. 6C shows a third state (full-locked state) of the locking mechanism.

  A digital camera (photographing apparatus) 10 according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the digital camera 10 includes a body main body 20 and a photographic lens 30 that can be attached to and detached from the body main body 20 (lens exchangeable).

  The taking lens 30 includes a taking lens group (shooting optical system) 40 and an image blur correction lens (shooting optical system, moving optical element) 50 in order from the subject side to the image plane side. In FIG. 1, the photographing lens group 40 is depicted as a single lens. However, the actual photographing lens group 40 is, for example, a fixed lens, a variable magnification lens that moves during zooming, a focusing lens that moves during focusing, or the like. Consists of multiple lenses. The image blur correcting lens 50 is moved by an image blur correcting unit (moving optical element holding unit) 100 in a plane including the X axis direction and the Y axis direction orthogonal to the optical axis Z of the photographing lens group 40 (hereinafter referred to as “optical axis orthogonal”). It is supported so as to be movable in a plane. A detailed configuration of the image blur correction unit 100 will be described later.

  The body main body 20 includes an image sensor 60 that forms a subject light beam that has passed through the photographing lens group 40 and the image blur correction lens 50 as a subject image. A subject image by the image sensor 60 is converted into an electrical pixel signal by a plurality of pixels arranged in a matrix, and is output to a DSP (not shown) as image data. The DSP performs predetermined image processing on the image data input from the image sensor 60, displays this on an LCD (not shown), and stores it in an image memory (not shown).

  Although not shown, the photographing lens 30 has a communication memory that stores various information such as resolving power information of the photographing lens group 40 and the image blur correction lens 50 and aperture diameter information of a diaphragm (not shown). ing. When the photographic lens 30 is mounted on the body main body 20, various information stored in the communication memory of the photographic lens 30 is read into the DSP of the body main body 20.

  Next, a detailed configuration of the image blur correction unit (moving optical element holding unit) 100 will be described.

  As shown in FIG. 2, the image shake correction unit 100 includes a base plate (fixing member) 110 that forms an all-round shape or an incomplete ring shape that surrounds the optical axis Z in order from the subject side to the image plane side. 1 yoke (fixing member) 120, image blur correction lens holding frame (moving optical element holding frame) 130, second yoke (fixing member) 140, fixing frame (fixing member) 150, and lock ring 160. doing. The base plate 110, the first yoke 120, the second yoke 140, and the fixed frame 150 are fixedly supported in the lens barrel of the photographing lens 30. The image blur correction lens holding frame 130 holds the image blur correction lens 50, and the optical axis with respect to the base plate 110, the first yoke 120, the second yoke 140, and the fixed frame 150 in the lens barrel of the photographing lens 30. It is supported so as to be movable in an orthogonal plane. The lock ring 160 is rotatably supported with respect to the base plate 110, the first yoke 120, the second yoke 140, and the fixed frame 150 in the lens barrel of the photographing lens 30.

  The fixed frame 150 is formed in a short cylindrical container shape in which a part of a circumferential wall centering on the optical axis Z is cut out and a central portion is opened. The fixed frame 150 is provided with three ball retainers 151 located at three locations in the circumferential direction of the bottom surface in the cylinder when the fixed frame 150 is viewed from the subject side. On the fixed frame 150, a lock ring drive motor 152 for rotating the lock ring 160 is mounted. A Y guide portion 153 extending in the Y direction (vertical direction) is integrally formed on the fixed frame 150.

  The image shake correction lens holding frame 130 includes a resin-made frame portion 131 and a metal support plate portion 132, both of which are substantially circular with the optical axis Z as the center. The frame 131 has an image blur correction lens 50 fitted and supported in a central circular opening. The support plate portion 132 is attached along the circumference of the front surface of the frame portion 131. An X driving coil 133X extending in the Y direction (vertical direction) and a Y driving coil 133Y extending in the X direction (horizontal direction) are provided on the support plate portion 132 of the image blur correction lens holding frame 130 along the circumference thereof. Is provided. Each of the X drive coil 133X and the Y drive coil 133Y is formed by winding a thin wire so as to be an oval shape having a long axis in the circumferential tangential direction, and penetrates the image blur correction lens holding frame 130 in the plate thickness direction. Thus, it is exposed to both sides in the optical axis direction. An X position detection magnet 134X and a Y position detection magnet 134Y are provided on the frame portion 131 of the image shake correction lens holding frame 130. The image blur correction lens holding frame 130 is formed with a pair of through-holes 135 each having a small opening size, which are rectangular, facing each other in the circumferential direction, penetratingly formed in the plate thickness direction. An X guide portion (not shown) extending in the X direction (horizontal direction) is integrally formed on the image plane side of the image shake correction lens holding frame 130.

  The second yoke 140 is formed of a magnetically permeable metal plate having a substantially semicircular arc shape centered on the optical axis Z. On the subject side surface of the second yoke 140, an X magnet 141X extending in the Y direction (vertical direction) and a Y magnet 141Y extending in the X direction (horizontal direction) are provided. The second yoke 140 is provided with a pair of posts 142 having a required length protruding from the subject side along the optical axis direction, positioned at both ends of the substantially semicircular arc shape. Each of the pair of posts 142 has a dumbbell shape in which small diameter portions 142a are formed at three positions, both ends in the length direction and an intermediate portion, and the rear ends (thin diameter portions 142a) are the second yoke 140. It is fixed by caulking.

  Similar to the second yoke 140, the first yoke 120 is formed of a magnetically permeable metal plate having a substantially semicircular arc shape centered on the optical axis Z. On the image side surface of the first yoke 120, an X magnet 121X extending in the Y direction (vertical direction) and a Y magnet 121Y extending in the X direction (horizontal direction) are provided. The first yoke 120 is formed with a pair of support holes 122 that are positioned at both ends of the substantially semicircular arc shape and into which a pair of posts 142 erected on the second yoke 140 can be respectively fitted. .

  According to the first yoke 120 and the second yoke 140, the X magnet 121X and the X magnet 141X face each other with the X drive coil 133X interposed therebetween, and the Y magnet 121Y and the Y magnet 141Y face each other with the Y drive coil 133Y interposed therebetween. The magnetic flux density of each magnet 121X, 121Y, 141X, 141Y can be increased.

  The base plate 110 is formed in a substantially annular plate shape with the optical axis Z as the center. The base plate 110 is formed with a pair of support holes 111 facing each other in the radial direction and spaced apart in the circumferential direction. The pair of support holes 111 are formed at positions corresponding to the pair of insertion holes 135 of the image blur correction lens holding frame 130 and the pair of support holes 122 of the first yoke 120. The front end portions (small-diameter portions 142a) of the pair of posts 142 that have passed through the pair of insertion holes 135 and the pair of support holes 122 of the first yoke 120 are fitted and fixed. The base plate 110 is provided with three ball retainers 112 positioned at three locations in the circumferential direction so as to correspond to the three ball retainers 151 of the fixed frame 150. The base plate 110 supports Hall element tables 113X and 113Y, respectively. The Hall element bases 113X and 113Y are respectively attached to the base plate 110 by the support arms 113, and the attachment positions of the Hall element bases 113X and 113Y on the base plate 110 are adjusted by adjusting the attachment positions of the support arms 113. Can be fine-tuned. Further, a flexible substrate 170 is attached to the rear surface of the base plate 110. The flexible substrate 170 has element substrates 172X and 172Y on which the Hall elements 171X and 171Y are mounted on the rear surface. When mounted on the base plate 110, the Hall elements 171X and 171Y are the Hall element bases 113X and 113Y, respectively. It is supported so that it may oppose. The flexible substrate 170 has two electrodes 173 extending on both sides thereof, and these two electrodes 173 are the electrodes of the X drive coil 133X and the Y drive coil 133Y mounted on the image blur correction lens holding frame 130, respectively. Connected to.

  The base plate 110, the first yoke 120, the image blur correction lens holding frame 130, and the second yoke 140 are assembled on the front surface of the fixed frame 150 in a state where they are stacked in this order in the optical axis direction. FIG. 3 is an enlarged cross-sectional view along the longitudinal direction of the post 142 in a state where the image blur correction unit 100 is assembled. The second yoke 140 is disposed along the front surface of the fixed frame 150, and the rear end portion (small diameter portion 142 a) of the post 142 protruding from the rear surface of the second yoke 140 is a fixing hole provided in the fixed frame 150. By being inserted into 154, connection and positioning with respect to the fixed frame 150 are performed. Next, the image blur correction lens holding frame 130 is provided from the front side, and the insertion hole 135 of the image blur correction lens holding frame 130 is inserted into the small-diameter portion 142a of the post 142 of the second yoke 140, thereby causing image blur. The correction lens holding frame 130 is positioned with respect to the second yoke 140 and the fixed frame 150. Here, since the opening size of the insertion hole 135 is larger than the diameter size of the small diameter portion 142 a of the post 142, the image blur correction lens holding frame 130 is in a plane orthogonal to the optical axis with respect to the second yoke 140 and the fixed frame 150. Relative movement is possible. Furthermore, the first yoke 120 is disposed on the front side of the image blur correction lens holding frame 130. When the support hole 122 of the first yoke 120 is fitted into the front end portion (the small diameter portion 142 a) of the post 142, the first yoke 120 is positioned with respect to the second yoke 140 and the fixed frame 150 and the second. The yoke 140 is integrated. Similarly, when the base plate 110 is disposed on the front surface side of the first yoke 120, the support hole 111 of the base plate 110 is fitted into the front end portion (the small diameter portion 142a) of the post 142, whereby the base plate 110 is moved to the first yoke 120. It is positioned with respect to the yoke 120 and is integrated with the first yoke 120.

  When the base plate 110, the first yoke 120, the image shake correction lens holding frame 130, the second yoke 140, and the fixed frame 150 are assembled in this way, the image shake correction lens holding frame 130 becomes the ball retainer 112 and the fixed frame 150 of the base plate 110. The ball retainer 151 sandwiches the image shake correction lens holding frame 130 in the optical axis direction at three positions spaced apart in the circumferential direction. In this state, the image shake correction lens holding frame 130 is maintained in a posture oriented perpendicular to the optical axis direction, and the optical axis between the ball retainer 112 of the base plate 110 and the ball retainer 151 of the fixed frame 150. It is possible to move smoothly in an orthogonal plane.

  Further, when the base plate 110, the first yoke 120, the image blur correction lens holding frame 130, the second yoke 140, and the fixed frame 150 are assembled in this way, the X magnet 121X and the X magnet 141X face each other with the X drive coil 133X interposed therebetween. Thus, the X magnetic actuator XM (FIG. 1) is configured, and the Y magnet 121Y and the Y magnet 141Y face each other with the Y drive coil 133Y interposed therebetween, thereby configuring the Y magnetic actuator YM (FIG. 1). The X magnet 121X and the X magnet 141X are constituted by end face two-pole magnets in which the S pole and the N pole are magnetized adjacent to each other without providing a neutral zone (a non-magnetized zone). The S pole and the N pole are opposed to each other. Therefore, a magnetic circuit is formed between the X magnet 121X and the X magnet 141X along the opposing direction, and a driving signal (driving current) is passed through the X driving coil 133X disposed in the magnetic circuit, so that X A driving force in the X direction is generated in the driving coil 133X, and the image blur correction lens holding frame 130 is moved in the X direction. Similarly, the Y magnet 121Y and the Y magnet 141Y are end face dipole magnets in which the S pole and the N pole are magnetized adjacent to each other without providing a neutral zone (a non-magnetized zone). The S pole and the N pole are opposed to each other. Therefore, a magnetic circuit is formed between the Y magnet 121Y and the Y magnet 141Y along the facing direction, and a drive signal (drive current) is supplied to the Y drive coil 133Y disposed in the magnetic circuit, thereby allowing Y A driving force in the Y direction is generated in the drive coil 133Y, and the image blur correction lens holding frame 130 is moved in the Y direction.

  The image shake correction lens holding frame 130 is moved in the plane orthogonal to the optical axis (X) by a Y guide portion 153 provided on the fixed frame 150 and an X guide portion (not shown) provided on the image shake correction lens holding frame 130. (Movement in the axial direction and the Y-axis direction) is regulated. As shown in FIG. 2, a thin rod-shaped guide member 180 is disposed between the image shake correction lens holding frame 130 and the fixed frame 150. The guide member 180 is formed in a substantially L shape having an X side portion 180X extending in the X direction (horizontal direction) and a Y side portion 180Y extending in the Y direction (vertical direction) from one end portion of the X side portion 180X. Has been. The Y guide portion 153 provided on the fixed frame 150 guides the Y side portion 180Y of the guide member 180, and the X guide portion (not shown) provided on the image blur correction lens holding frame 130 is the X side of the guide member 180. Guide part 180X.

  In order to detect the position (X-axis direction and Y-axis direction positions) of the image shake correction lens holding frame 130 in the plane orthogonal to the optical axis, the image shake correction lens holding frame 130 includes X position detection magnets 134X and Y. A position detecting magnet 134Y is supported, and Hall elements 171X and 171Y are mounted on the base plate 110 on Hall element bases 113X and 113Y by a flexible substrate 170. An X position sensor XS (FIG. 1) is configured by the X position detection magnet 134X and the Hall element 171X, and a Y position sensor YS (FIG. 1) is configured by the Y position detection magnet 134Y and the Hall element 171Y.

  In the X position sensor XS, when the image blur correction lens holding frame 130 moves in the X direction, the magnetic field formed by the X position detection magnet 134X is also moved simultaneously, and the magnetic flux density with respect to the Hall element 171X changes. In the X position sensor XS, the movement position of the X position detection magnet 134X, that is, the position of the image shake correction lens holding frame 130 in the X direction is detected by detecting the change in the output current of the Hall element 171X accompanying the change in the magnetic flux density. Can be detected. Similarly, in the Y position sensor YS, when the image shake correction lens holding frame 130 moves in the Y direction, the magnetic field formed by the Y position detection magnet 134Y is also moved simultaneously, and the magnetic flux density with respect to the Hall element 171Y changes. . The Y position sensor YS detects the movement position of the Y position detection magnet 134Y, that is, the position of the image shake correction lens holding frame 130 in the Y direction by detecting the change in the output current of the Hall element 171Y accompanying the change in the magnetic flux density. Can be detected.

  The image shake correction unit 100 of the present embodiment displaces the image formation position of the subject image on the image sensor 60 by driving the image shake correction lens 50 with a relatively large amount of movement in the plane orthogonal to the optical axis. “Image blur correction drive” for correcting image blur is possible. The digital camera 10 includes gyro sensors XG and YG that detect shake detection signals indicating shake in the plane orthogonal to the optical axis of the body main body 20 (FIG. 1). A lens CPU (not shown) mounted on the photographing lens 30 performs a predetermined calculation based on shake detection signals detected by the gyro sensors XG and YG and position detection signals from the X position sensor XS and the Y position sensor YS. The calculated drive signal (drive current) is passed through the flexible substrate 170 to the X drive coil 133X and the Y drive coil 133Y. As a result, the X magnetic actuator XM and the Y magnetic actuator YM are driven, and the image blur correction lens holding frame 130 (image blur correction lens 50) is driven with a relatively large amount of movement in the plane orthogonal to the optical axis. By shifting the image formation position of the subject image on the image sensor 60, it is possible to correct image shake caused by camera shake. Although not shown, the body main body 20 of the digital camera 10 is provided with a switch for switching on / off “image blur correction driving” by the image blur correction unit 100.

  The image blur correction unit 100 according to the present embodiment drives the image blur correction lens 50 with a relatively small amount of movement (microvibration) in a plane orthogonal to the optical axis, thereby causing subject light flux to enter a plurality of pixels of the image sensor 60. Thus, “LPF driving” is possible to obtain an optical low-pass filter effect. Although not shown, the body body 20 of the digital camera 10 is provided with a switch for switching on / off “LPF driving” by the image blur correction unit 100. A lens CPU (not shown) mounted on the photographic lens 30 outputs a high-frequency drive signal for driving the LPF when the “LPF drive” by the image blur correction unit 100 is turned on by this switch. Through the X drive coil 133X and the Y drive coil 133Y. Accordingly, for example, as shown in FIG. 4, the image blur correction lens holding frame 130 (image blur correction lens 50) is driven so as to draw a circular locus in the optical axis orthogonal plane. Then, the subject light beam (light beam) incident on the center of the four color filters R, G, B, G (pixel 60a) of the image sensor 60 is equally incident on the four color filters R, G, B, G. Therefore, the same effect as the optical low-pass filter can be obtained. That is, since light rays incident on any of the color filters R, G, B, G (pixel 60a) are necessarily incident on the surrounding color filters R, G, B, G (pixel 60a), the optical low-pass filter is also very much optical. The effect equivalent to that of the light beam passing through is obtained.

As shown in Table 1, the driving mode of the image blur correction lens 50 is “mode 1” in which image blur correction driving and LPF driving are combined as these driving modes, and “mode 2” in which only image blur correction driving is performed. “Mode 3” in which only the LPF drive is performed alone and “mode 4” in which neither the image blur correction drive nor the LPF drive is performed are possible.

  As shown in FIG. 5, when the image blur correction drive range and the LPF drive range of the image blur correction lens 50 are compared, the image blur correction drive range is overwhelmingly larger than the LPF drive range. As shown in the figure, the image blur correction unit 100 performs the image blur correction lens 50 in the “mode 4” in which neither the image blur correction drive nor the LPF drive of the image blur correction lens 50 is performed. It is held at the center position between the correction drive range and the LPF drive range.

  The image blur correction unit 100 according to the present embodiment includes a “first state (unlock state)” that allows both image blur correction driving and LPF driving of the image blur correction lens 50, and image blur of the image blur correction lens 50. The “second state (half-lock state)” in which correction driving is prohibited and LPF driving is allowed, and the “third state (full lock) in which both image blur correction driving and LPF driving of the image blur correction lens 50 are prohibited. "Lock mechanism" that can be switched between "status)". This “lock mechanism” is configured by the cooperation of the image blur correction lens holding frame 130 and the lock ring 160.

  A lock ring 160 having an annular plate shape centered on the optical axis Z is disposed and supported on the rear surface side of the fixed frame 150. The lock ring 160 is disposed around an annular rib 136 (FIG. 6) formed on the rear surface of the image blur correction lens holding frame 130, and is supported so as to be rotatable around the optical axis. A gear 161 is formed on a part of the circumference of the lock ring 160, and this gear 161 meshes with a pinion 152 a (FIG. 6) of the lock ring drive motor 152 supported by the fixed frame 150. By rotating the lock ring drive motor 152, the lock ring 160 is rotationally driven with respect to the fixed frame 150. A photo interrupter 155 for detecting the rotational position of the lock ring 160 is provided on a part of the circumference of the fixed frame 150.

  As shown in FIGS. 6A to 6C, the image blur correction lens holding frame 130 has four protrusions (locking mechanisms) 137 protruding from the annular rib 136 in the outer diameter direction. . The lock ring 160 has four first cam recesses (lock mechanisms) 162 whose inner peripheral surface is recessed relatively deeply in the outer diameter direction, and whose inner peripheral surface is recessed relatively shallowly in the outer diameter direction. It has four second cam recesses (lock mechanism) 163. Each of the four protrusions 137, the first cam recess 162, and the second cam recess 163 are arranged at 90 ° intervals in the circumferential direction.

  As shown in FIG. 6A, when the driving mode of the image blur correction lens 50 is “Aspect 1” or “Aspect 2” in Table 1 above, the lock ring 160 is automatically operated via the lock ring drive motor 152. By controlling the rotational drive at, the four protrusions 137 of the image blur correction lens holding frame 130 are positioned in the four first cam recesses 162 of the lock ring 160. As a result, the “lock mechanism” enters a “first state (unlocked state)” that allows both the image blur correction drive and the LPF drive of the image blur correction lens 50. That is, the image blur correction lens 50 can freely move within the image blur correction drive range shown in FIG.

  As shown in FIG. 6B, when the drive mode of the image blur correction lens 50 is “mode 3” in Table 1 above, the lock ring 160 is automatically rotated and controlled via the lock ring drive motor 152. As a result, the four protrusions 137 of the image blur correction lens holding frame 130 are positioned in the four second cam recesses 163 of the lock ring 160. As a result, the “lock mechanism” enters a “second state (half-lock state)” in which the image blur correction drive of the image blur correction lens 50 is prohibited and the LPF drive is allowed. That is, the image blur correction lens 50 can freely move only within the LPF drive range shown in FIG. 5 (it cannot move freely within the image blur correction drive range).

  As shown in FIG. 6C, when the driving mode of the image blur correction lens 50 is “Aspect 4” in Table 1, the lock ring 160 is automatically rotated and controlled via the lock ring driving motor 152. As a result, the four protrusions 137 of the image blur correction lens holding frame 130 come into contact (engagement) with the inner peripheral surface of the lock ring 160. As a result, the “lock mechanism” enters a “third state (full lock state)” in which both the image blur correction drive and the LPF drive of the image blur correction lens 50 are prohibited. That is, as shown in FIG. 5, the image blur correction unit 100 holds the image blur correction lens 50 at the center position between the image blur correction drive range and the LPF drive range.

  As described above, according to the present embodiment, the image blur correction unit (optical element holding unit) 100 is in the first state in which both the image blur correction drive and the LPF drive of the image blur correction lens (optical element) 50 are allowed ( Unlocked state), a second state (half-lock state) in which image blur correction driving of the image blur correction lens (optical element) 50 is prohibited and LPF driving is allowed, and an image blur correction lens (optical element) 50 A lock mechanism (130, 137, 160, 162, 163) that can be switched between a third state (full lock state) that prohibits both image blur correction drive and LPF drive is provided. Accordingly, the image blur correction lens (optical element) 50 that performs image blur correction driving and LPF driving can be suitably held. That is, the image blur correction unit (optical element holding unit) 100 can be reduced in size, simplified in structure, reduced in cost, reduced in power consumption, and improved in responsiveness to switching of driving modes.

  In the above embodiment, the case where the four projections 137 are formed on the image blur correction lens holding frame 130 and the four first cam recesses 162 and the second cam recesses 163 are formed on the lock ring 160 will be described as an example. However, another embodiment in which this positional relationship is reversed is possible. In this alternative embodiment, the lock ring has a plurality of protrusions that protrude in the inner diameter direction from the inner peripheral surface thereof, and the optical element holding frame has an inner diameter between the annular rib and the outer peripheral surface of the annular rib. A plurality of first cam recesses that are relatively deeply recessed in the direction, and a plurality of second cam recesses in which the outer peripheral surface of the annular rib is relatively shallowly recessed in the inner diameter direction. However, when the protrusion of the lock ring is positioned in the first cam recess of the optical element holding frame in accordance with the rotation of the lock ring, the first state (unlocked state) is established, and the protrusion of the lock ring Is in the second cam recess of the optical element holding frame, the second state (half-locked state) occurs, and the protrusion of the lock ring comes into contact with the outer peripheral surface of the annular rib of the optical element holding frame. The third state (full lock state).

  In the above embodiment, the case where each of the four protrusions 137, the first cam recess 162, and the second cam recess 163 are arranged at intervals of 90 ° in the circumferential direction has been described as an example. However, it is sufficient if there are a plurality of protrusions, first cam recesses, and second cam recesses, and the number thereof is flexible, and it is not always necessary to arrange them at equal angular intervals in the circumferential direction.

  In the above embodiment, in order to execute the image blur correction drive and the LPF drive, the image blur correction lens (moving optical element) 50 is placed in the optical axis orthogonal plane via the image blur correction unit (moving optical element holding unit) 100. However, the direction in which the image blur correction lens (moving optical element) 50 is driven is not limited to this, and may be any direction different from the optical axis of the photographing optical system.

  In the above embodiment, the case where the predetermined locus drawn by the image shake correction lens (moving optical element) 50 in the LPF drive is a circular locus in the optical axis orthogonal plane has been described as an example. However, the present invention is not limited to this. For example, a mode in which a square locus, a rectangular locus, or a linear reciprocating locus in an optical axis orthogonal plane is also possible.

  In the above embodiment, the mode in which the body main body 20 and the photographing lens 30 are detachable (lens exchangeable) has been described as an example. Is also possible.

10 Digital camera (photographing device)
20 Body 30 Shooting lens 40 Shooting lens group (shooting optical system)
50 Image stabilization lens (photographing optical system, moving optical element)
60 Image sensor 60a Pixel 100 Image shake correction unit (moving optical element holding unit)
110 Base plate (fixing member)
111 Support hole 112 Ball retainer 113 Support arm 113X 113Y Hall element base 120 First yoke (fixing member)
121X X magnet 121Y Y magnet 122 Support hole 130 Image blur correction lens holding frame (moving optical element holding frame, locking mechanism)
131 Frame portion 132 Support plate portion 133X X drive coil 133Y Y drive coil 134X X position detection magnet 134Y Y position detection magnet 135 Insertion hole 136 Annular rib 137 Projection (lock mechanism)
140 Second yoke (fixing member)
141X X magnet 141Y Y magnet 142 Post 142a Small diameter portion 150 Fixed frame (fixing member)
151 Ball retainer 152 Lock ring drive motor 152a Pinion 153 Y guide portion 154 Fixing hole 155 Photo interrupter 160 Lock ring (lock mechanism)
161 Gear 162 First cam recess (lock mechanism)
163 Second cam recess (lock mechanism)
170 Flexible substrate 171X 171Y Hall element 172X 172Y Element substrate 173 Electrode 180 Guide member 180X X side portion 180Y Y side portion XM X magnetic actuator YM Y magnetic actuator XS X position sensor YS Y position sensor XG YG gyro sensor

Claims (7)

An optical element holding unit that holds an optical element that forms at least a part of a photographing optical system that forms a subject luminous flux as a subject image on a plurality of pixels of an image sensor,
Image blur correction that corrects image blur by displacing the imaging position of a subject image on the image sensor by driving the optical element in a direction different from the optical axis of the photographing optical system with a relatively large amount of movement. Can be driven;
LPF drive for obtaining an optical low-pass filter effect by causing the subject light flux to enter a plurality of pixels of the image sensor by driving the optical element in a direction different from the optical axis of the photographing optical system with a relatively small amount of movement. And a first state in which image blur correction driving and LPF driving of the optical element are allowed, and a second state in which image blur correction driving of the optical element is prohibited and LPF driving is allowed. And a lock mechanism that can be switched between a third state in which both image blur correction driving and LPF driving of the optical element are prohibited;
An optical element holding unit. The optical element holding unit according to claim 1, wherein
The optical element holding unit includes a fixing member, an optical element holding frame that holds the optical element and is supported so as to be movable in a plane orthogonal to the optical axis with respect to the fixing member, and is rotatable on the fixing member. And a supported lock ring,
An optical element holding unit in which the optical element holding frame and the lock ring cooperate to constitute the lock mechanism. The optical element holding unit according to claim 2,
The optical element holding frame has an annular rib and a plurality of protrusions protruding from the annular rib in the outer diameter direction,
The lock ring includes a plurality of first cam recesses whose inner peripheral surface is recessed relatively deep in the outer diameter direction, and a plurality of second cams whose inner peripheral surface is recessed relatively shallow in the outer diameter direction. Having a recess,
The lock mechanism is in the first state when the protrusion of the optical element holding frame is positioned in the first cam recess of the lock ring according to the rotation of the lock ring, When the projection of the optical element holding frame is located in the second cam recess of the lock ring, the second state is established, and the projection of the optical element holding frame is an inner peripheral surface of the lock ring. An optical element holding unit that is in the third state when in contact with the optical element. The optical element holding unit according to claim 2,
The lock ring has a plurality of protrusions protruding in the inner diameter direction from the inner peripheral surface thereof,
The optical element holding frame has an annular rib, a plurality of first cam recesses in which the outer peripheral surface of the annular rib is relatively deeply recessed in the inner diameter direction, and the outer peripheral surface of the annular rib is relative to the inner diameter direction. A plurality of second cam recesses that are shallowly recessed,
The lock mechanism is in the first state when the protrusion of the lock ring is located in the first cam recess of the optical element holding frame in response to the rotation of the lock ring, When the projection of the lock ring is located in the second cam recess of the optical element holding frame, the second state is established, and the projection of the lock ring is the ring of the optical element holding frame. The optical element holding unit that is in the third state when being in contact with the outer peripheral surface of the rib. The optical element holding unit according to any one of claims 1 to 4,
In the third state, the lock mechanism is an optical element holding unit that holds the optical element at the center position between the image blur correction drive range and the LPF drive range. A photographic lens having a photographic optical system that forms a subject light beam as a subject image on a plurality of pixels of an image sensor; and an optical element holding unit that holds an optical element that forms at least a part of the photographic optical system,
Image blur correction that corrects image blur by displacing the imaging position of a subject image on the image sensor by driving the optical element in a direction different from the optical axis of the photographing optical system with a relatively large amount of movement. Can be driven;
LPF drive for obtaining an optical low-pass filter effect by causing the subject light flux to enter a plurality of pixels of the image sensor by driving the optical element in a direction different from the optical axis of the photographing optical system with a relatively small amount of movement. And a first state in which the optical element holding unit permits both image blur correction driving and LPF driving of the optical element, and prohibits image blur correction driving of the optical element and LPF driving. A lock mechanism that can be switched between a second state in which the optical element is permitted and a third state in which both the image blur correction drive and the LPF drive of the optical element are prohibited;
This is a photographic lens. An imaging apparatus comprising: an image sensor having a plurality of pixels that forms a subject light flux that has passed through a photographing optical system as a subject image; and an optical element holding unit that holds an optical element that forms at least a part of the photographing optical system. And
Image blur correction that corrects image blur by displacing the imaging position of a subject image on the image sensor by driving the optical element in a direction different from the optical axis of the photographing optical system with a relatively large amount of movement. Can be driven;
LPF drive for obtaining an optical low-pass filter effect by causing the subject light flux to enter a plurality of pixels of the image sensor by driving the optical element in a direction different from the optical axis of the photographing optical system with a relatively small amount of movement. And a first state in which the optical element holding unit permits both image blur correction driving and LPF driving of the optical element, and prohibits image blur correction driving of the optical element and LPF driving. A lock mechanism that can be switched between a second state in which the optical element is permitted and a third state in which both the image blur correction drive and the LPF drive of the optical element are prohibited;
An imaging device characterized by the above.

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