JP2020187291A - Image shake correction device, and imaging apparatus - Google Patents

Abstract

To provide an image shake correction device capable of reducing the size, and an imaging apparatus.SOLUTION: The image shake correction device includes: a first lens tube that holds a first optical member; a second lens tube that holds a second optical member; an actuator that moves the first lens tube in the direction orthogonal to the optical axis of the first optical member with respect to the second lens tube; and a lock member that is held by the second lens tube rotatable between the lock position that regulates the movement of the first lens tube and the unlock position that allows the movement of the first lens tube. The lock member is positioned to overlap with the second optical member in the orthogonal direction.SELECTED DRAWING: Figure 7

Description

The present invention relates to an image shake correction device and an image pickup device.

Conventionally, in optical devices such as digital still cameras, video cameras, and interchangeable lenses, image shake is caused by shifting the lens with respect to the optical axis of the optical system in order to reduce image shake caused by shake such as camera shake. A correction device is installed. The image shake correction device includes a shake sensor that detects the shake of the optical device and an actuator that shifts the lens according to the output from the shake sensor. However, when the user chooses not to perform image shake correction or when the power of the optical device is off, it is necessary to limit the shift of the lens.

Patent Document 1 describes between a lock position that limits the shift of the shift lens barrel and an unlock position that releases the limit by contacting a plurality of protrusions provided on the outer periphery of the shift lens barrel that shifts integrally with the lens. An image shake correction mechanism including a lock member rotatably supported is disclosed.

Japanese Unexamined Patent Publication No. 2014-13290

However, in the image runout correction mechanism of Patent Document 1, it is necessary to secure an area for arranging the lock member when the optical member and the actuator are arranged close to each other, and the mechanism becomes large.

An object of the present invention is to provide an image shake correction device, a lens barrel device, and an image pickup device that can be miniaturized.

The image shake correction device as one aspect of the present invention relates to a first lens barrel that holds the first optical member, a second lens barrel that holds the second optical member, and a second lens barrel. An actuator that moves the first lens barrel in a direction orthogonal to the optical axis of the first optical member, a lock position that restricts the movement of the first lens barrel, and an ann that allows the movement of the first lens barrel. It has a lock member that is rotatably held in the second lens barrel between the lock position and the lock member, and the lock member is arranged so as to overlap the second optical member in a direction orthogonal to the lock position. To do.

According to the present invention, it is possible to provide an image shake correction device and an image pickup device that can be miniaturized.

It is sectional drawing of the image pickup apparatus equipped with the image shake correction apparatus which concerns on embodiment of this invention. It is an exploded perspective view of the image shake correction device. It is a front view of the image shake correction device. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 3 of the image shake correction device. FIG. 5 is a sectional view taken along line BB of FIG. 4 of an image shake correction device when the lock member is located at an unlocked position. FIG. 5 is a cross-sectional view taken along the line BB of FIG. 4 of an image shake correction device when the lock member is located at the lock position. It is sectional drawing of the image shake correction apparatus when a lock member is located at a lock position. It is sectional drawing which shows the holding position of a lock member.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In each figure, the same member is given the same reference number, and duplicate description is omitted.

FIG. 1 is a cross-sectional view of an image pickup apparatus 1000 equipped with an image shake correction apparatus 100 according to an embodiment of the present invention. The image pickup apparatus 1000 includes a lens barrel device 201 and a camera body 1 to which the lens barrel device 201 is detachably attached.

A photographing optical system is housed in the lens barrel device 201. The photographing optical system includes a focus lens 205 that moves along the optical axis of the photographing optical system for focus adjustment, an aperture 206 that adjusts the amount of light, a correction lens for vibration isolation included in the image shake correction device 100, and an image not shown. Consists of other lenses. In the following description, the optical axis direction in which the optical axis of the photographing optical system extends is defined as the X-axis direction, and the directions orthogonal to this are defined as the Z-axis direction (horizontal direction) and the Y-axis direction (vertical direction). The Z-axis direction and the Y-axis direction are collectively referred to as the Z / Y-axis direction. Further, the rotation direction around the Z axis is the pitch direction, and the rotation direction around the Y axis is the yaw direction. The pitch direction and the yaw direction are collectively referred to as the pitch / yaw direction.

The lens barrel device 201 includes a sensor 203 that detects the runout of the lens barrel device 201 in the pitch / yaw direction. The sensor 203 is composed of an angular velocity sensor. The image shake correction device 100 shifts the correction lens in a direction orthogonal to the optical axis (the central axis of the image shake correction device 100 or the optical axis of the photographing optical system) according to the shake of the lens barrel device 201 to cause image shake. Reduce (correct).

The camera body 1 includes a mount portion 11 and is detachably attached to the lens barrel device 201. A camera microcomputer 12 composed of a CPU or the like is provided in the camera body 1. The camera microcomputer 12 can communicate with the lens microcomputer 202 configured by the CPU or the like provided in the lens barrel device 201 via the contact block 13 provided in the mount portion 11.

The camera body 1 includes a shutter unit 14 arranged in the optical path of the photographing optical system, and an image sensor 15 composed of a CMOS sensor and the like.

When the power switch (not shown) provided on the camera body 1 is turned on, the camera microcomputer 12 and the lens microcomputer 202 are activated. When the release switch (not shown) provided on the camera body 1 is half-pressed, the camera microcomputer 12 performs photometry and focus detection. Photometry and focus detection are performed using a video signal generated based on the output from the image sensor 15. As a result, the focal state of the photographing optical system is detected.

The camera microcomputer 12 determines the shutter speed and the aperture value according to the photometric result. Further, the camera microcomputer 12 transmits a focus control signal to the lens microcomputer 202 according to the focus detection result. The lens microcomputer 202 controls the focus actuator 204 in response to the received focus control signal to move the focus lens 205 to the in-focus position. As a result, autofocus (AF) is performed.

When the release switch is half-pressed, the lens microcomputer 202 starts controlling the image shake correction operation (vibration isolation operation) of the image shake correction device 100. Specifically, the lens microcomputer 202 integrates the angular velocity signals output from the yaw and pitch shake sensor 203 with the runout of the lens barrel device 201 to calculate the angular displacement and its direction. Then, based on the calculated angular displacement, the shift amount and shift direction of the correction lens for reducing the image shake on the image sensor 15 are calculated, and the actuator described later is driven according to the calculated shift amount and shift direction. To do.

When the release switch is fully pressed, the camera microcomputer 12 transmits an aperture control signal corresponding to the aperture value determined according to the light measurement result to the lens microcomputer 202. The lens microcomputer 202 operates the aperture 206 according to the received aperture control signal. Further, the camera microcomputer 12 opens and closes the shutter unit 14 at a shutter speed determined according to the photometric result. As a result, the image sensor 15 is exposed.

The image sensor 15 photoelectrically converts the light that has passed through the lens barrel device 201 and outputs an image pickup signal as an electric signal. The image processing circuit in the camera microcomputer 12 performs various signal processing on the image pickup signal to generate a video signal. The video signal is displayed on the rear monitor of the camera body 1 or recorded on a recording medium such as a semiconductor memory.

Hereinafter, the configuration of the image shake correction device 100 will be described with reference to FIGS. 2 to 4. FIG. 2 is an exploded perspective view of the image shake correction device 100. FIG. 3 is a front view of the image shake correction device 100. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3 of the image shake correction device 100.
[Basic configuration]
The image shake correction device 100 includes a first optical member 101, a shift lens barrel 103, a base lens barrel 104, a rotation blocking plate 107, a plurality of first rolling members 108, and a plurality of second rolling members, which are correction lenses. It includes a member 109, an urging spring 110, and an actuator 105. In this embodiment, three roll members 108 and three roll members 109 are provided.

The base lens barrel (second lens barrel) 104 holds the second optical member 102, and is fixed to the lens barrel device 201 via a roller (not shown), and one end of the urging spring 110. There are three spring holding portions to which the optics are attached at three locations in the circumferential direction. Further, the base lens barrel 104 includes a flat surface receiving portion that comes into contact with the first rolling member 108.

The shift lens barrel (first lens barrel) 103 holds the first optical member 101 and shifts in the Z / Y axis direction together with the first optical member 101. The shift lens barrel 103 is provided with a flat surface receiving portion that comes into contact with the second rolling member 109 and two V-shaped grooves extending in the Y-axis direction that come into contact with the second rolling member 109. Further, the shift lens barrel 103 is provided with spring holding portions at three locations in the circumferential direction to which one end of the urging spring 110 is attached.
[Actuator]
The actuator 105 drives the shift lens barrel 103 in the Z / Y axis direction. The actuator 105 includes a first coil 111a, a second coil 111b, a first magnet group 112a, a second magnet group 112b, a third magnet group 112c, a fourth magnet group 112d, a first yoke 114, a second yoke 115, and a support column. A member 116 is provided.

The first coil 111a and the second coil 111b are fixed to the shift lens barrel 103 with a UV adhesive or the like. The first coil 111a is located between the first magnet group 112a and the second magnet group 112b, and drives the shift lens barrel 103 in the Y-axis direction. The second coil 111b is located between the third magnet group 112c and the fourth magnet group 112d, and drives the shift lens barrel 103 in the Z-axis direction.

The first yoke 114 and the second yoke 115 are made of a magnetic material. The first yoke 114 is fixed to the base lens barrel 104 with screws or the like, and magnetically attracts and holds the first magnet group 112a and the third magnet group 112c. The second yoke 115 magnetically attracts and holds the second magnet group 112b and the fourth magnet group 112d. The first yoke 114 and the second yoke 115 are magnetically attracted to each other by the first to fourth magnet groups 112a to 112d, and hold a predetermined interval by sandwiching the support column member 116.

When the first coil 111a is energized, an electromagnetic force acting between the first magnet group 112a and the second magnet group 112b generates a force in the Y-axis direction in the first coil 111a, and the shift lens barrel 103 moves in the Y-axis direction. Driven to. The driving direction of the shift lens barrel 103 is reversed depending on the direction of energization of the first coil 111a. The lens microcomputer 202 controls the current flowing through the first coil 111a to freely drive the first optical member 101 held in the shift lens barrel 103 in the Y-axis direction to correct image shake. The same applies to the drive in the Z-axis direction by energizing the second coil 111b.
[Anti-roll]
One of the first rolling members 108 is sandwiched between the flat receiving portion of the base lens barrel 104 and the flat receiving portion of the rotation blocking plate 107, and two are V-shaped grooves extending in the Z-axis direction of the first yoke 114. And a V-shaped groove extending in the Z-axis direction of the rotation blocking plate 107. Further, one of the second rolling members 109 is sandwiched between the flat receiving portion of the first yoke 114 and the flat receiving portion of the shift lens barrel 103, and two of them extend in the Y-axis direction of the rotation blocking plate 107. It is sandwiched between the character groove and the V-shaped groove extending in the Y-axis direction of the shift lens barrel 103. By rolling the first rolling member 108 and the second rolling member 109, the shift lens barrel 103 is guided in the Z / Y axis direction without a load, and the rotation around the X axis is regulated.

The urging spring 110 is attached to the shift lens barrel 103 and the base lens barrel 104, and is based on the shift lens barrel 103 via the first rolling member 108, the second rolling member 109, and the rotation blocking plate 107. The lens barrel 104 is urged in the X-axis direction. Therefore, the shift lens barrel 103 is movably supported in the Z / Y axis direction in the X axis direction.

The cover member 117 is attached to the base lens barrel 104 with a screw or the like, has a predetermined gap between the cover member 117 and the shift lens barrel 103, and has a front contact surface in the X-axis direction (not shown). When an impact is applied to the image shake correction device 100 and the urging force of the urging spring 110 is lost and the shift lens barrel 103 cannot be supported in the X-axis direction and floats up, the shift lens barrel 103 and the front contact surface in the X-axis direction Abut with. As a result, it is possible to suppress the lifting of the shift lens barrel 103 and prevent the member from falling off or being damaged.
[Lock ring]
The shift lens barrel 103 includes a plurality of (eight in this embodiment) first protrusions 103a extending in the X-axis direction from the outer peripheral portion of the first optical member 101.

The lock member 106 is rotatably held by the base lens barrel 104 around the X-axis by a bayonet structure between the base lens barrel 104 and the actuator 105. Further, the lock member 106 includes a plurality of (eight in this embodiment) second protrusions 106a extending in the X-axis direction from the outer peripheral portion of the second optical member 102. When the first protrusion 103a and the second protrusion 106a are in contact with each other, the shift of the shift lens barrel 103 in the Z / Y axis direction is restricted.

The lock actuator 113 rotates the lock member 106 around the X-axis to switch between a state in which the first protrusion 103a and the second protrusion 106a are in contact with each other and a state in which the second protrusion 106a is not in contact.
[Lock ring contact position]
Hereinafter, the contact position between the lock member 106 and the shift lens barrel 103 will be described with reference to FIGS. 5 and 6. FIG. 5 shows BB of FIG. 4 of the image shake correction device 100 when the lock member 106 is located at the unlocked position where the shift restriction of the shift lens barrel 103 is released (the shift of the shift lens barrel 3 is allowed). It is a line sectional view. FIG. 6 is a sectional view taken along line BB of FIG. 4 of the image shake correction device 100 when the lock member 106 is located at a lock position that regulates the shift of the shift lens barrel 103.

As shown in FIG. 5, when the locking member 106 rotates in the counterclockwise direction (CCW direction) when viewed from the negative direction in the X-axis direction, and the locking member 106 is located in the unlocked position, the first The protrusion 103a and the second protrusion 106a do not come into contact with each other. The second protrusion 106a is located between the circumferential directions of the first protrusion 103a. The distance between the second protrusion 106a and the first protrusion 103a in the Z / Y axis direction is sufficiently far from the movable region of the shift lens barrel 103. Further, the base lens barrel 104 and the actuator 105 are located outside the movable region of the shift lens barrel 103 in the Z / Y axis direction, and have a shape that does not hinder the driving of the shift lens barrel 103.

As shown in FIG. 6, when the lock member 106 rotates in the clockwise direction (CW direction) when viewed from the negative direction in the X-axis direction, and the lock member 106 is located at the lock position, the first protrusion The 103a and the second protrusion 106a are in contact with each other. The first protrusion 103a and the second protrusion 106a face each other in the X-axis direction, and the circumscribed circle on the outer periphery of the first protrusion 103a and the inscribed circle on the inner circumference of the second protrusion 106a. Is in a fitting relationship with a small gap. When the second protrusion 106a overlaps with at least a part of the first protrusion 103a in the phase around the X axis, the lock member 106 limits the driving of the shift lens barrel 103 in the Z / Y axis direction.
[Space saving in X direction]
7 (a) and 7 (b) are a sectional view taken along line CC and a sectional view taken along line DD of FIG. 6, respectively. FIG. 7A shows the positional relationship between the second optical member 102 and the lock member 106 in the X-axis direction and the first protrusion 103a and the second protrusion 106a. FIG. 7B shows the positional relationship between the second optical member 102 and the actuator 105 in the X-axis direction.

The arrangement region L of the lock member 106 in the X-axis direction overlaps with the arrangement region G2 of the second optical member 102 in the X-axis direction in the X-axis direction. Further, the contact region M between the first protrusion 103a and the second protrusion 106a in the X-axis direction also overlaps with the region G2 in the X-axis direction. Further, at least a part of the arrangement region N of the actuator 105 in the X-axis direction also overlaps with the region G2 in the X-axis direction.

With the above configuration, the lock member 106 is arranged on the outer periphery of the second optical member 102, and the actuator 105 is arranged on the outer periphery of the first optical member 101 by extending the first protrusion 103a to the region G2. You can make space. Further, by arranging the actuator 105 so as to hang on the region G2, the thickness of the image shake correction device 100 in the X-axis direction can be suppressed, and the space-saving image shake correction device 100 can be realized.
[High accuracy]
Hereinafter, with reference to FIG. 8, the holding accuracy of the shift lens barrel 103 in the Z / Y axis direction when the lock member 106 is located at the locked position will be described. FIG. 8 is an enlarged view of a part of the cross-sectional view taken along the line CC of FIG. 6 of the image shake correction device 100, in which the holding position of the lock member 106 in the Z / Y axis direction and the lock member 106 are located at the lock positions. It shows how the impact load is transmitted when doing so.

The lock member 106 includes a sliding side surface portion 104a of the base lens barrel 104 and an outer peripheral side surface portion 106b that slides around the X axis, and is held with high accuracy in the Z / Y axis direction with respect to the base lens barrel 104. The sliding side surface portion 104a is located so as to face the outer peripheral direction of the optical member holding portion (holding surface) 104b that holds the second optical member 102 of the base lens barrel 104.

If the shift lens barrel 103 is restricted from moving in the Z / Y axis direction when the lock member 106 is located at the unlocked position, the member interposed between the shift lens barrel 103 and the base lens barrel 104 is the lock member 106. Only, it is possible to minimize backlash and the like at the contact portion of each member.

Subsequently, a case where an impact is applied to the image shake correction device 100 when the lock member 106 is located at the lock position will be described. When the lock member 106 is located at the unlocked position and an impact due to vibration or dropping is applied to the image shake correction device 100, an inertial force F1 in the Z / Y axis direction acts on the shift lens barrel 103. Along with this, the first protrusion 103a collides with the second protrusion 106a, and a load F2 in the Z / Y axis direction is applied to the lock member 106. The first protrusion 103a and the second protrusion 106a have a cantilever shape and bend when a load is applied to act like a spring, so that the time when the load is applied in the Z / Y axis direction is dispersed. , The impact can be mitigated. Further, since the first protrusion 103a does not overlap with the holding portion 103b holding the first optical member 101 of the shift lens barrel 103 in the X-axis direction, the load applied to the first optical member 101 can be reduced. .. Further, the sliding side surface portion 104a receives a load F3 from the lock member 106 in the Z / Y axis direction. Therefore, no load is applied to the optical member holding portion 104b in the Z / Y axis direction, and the load applied to the second optical member 102 can be reduced. As a result, it is possible to suppress the holding deviation of the first optical member 101 and the second optical member 102 due to the impact in the Z / Y axis direction.

With the above configuration, when the lock member 106 is located at the locked position, the shift lens barrel 103, the first optical member 101, the base lens barrel 104, and the second optical member 102 are held with high accuracy in the Z / Y axis direction. Can be realized.

As described above, according to the configuration of the present embodiment, the image shake correction device 100 can be miniaturized. Further, it is possible to hold the shift lens barrel 103 with high accuracy when locked.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

100 Image runout correction device 101 First optical member 102 Second optical member 103 Shift lens barrel (first lens barrel)
104 Base lens barrel (second lens barrel)
105 Actuator 106 Lock member

Claims (5)

A first lens barrel that holds the first optical member,
A second lens barrel that holds the second optical member,
An actuator that moves the first lens barrel with respect to the second lens barrel in a direction orthogonal to the optical axis of the first optical member.
A lock member rotatably held in the second lens barrel between a lock position that restricts the movement of the first lens barrel and an unlock position that allows the movement of the first lens barrel. Have and
An image shake correction device, characterized in that the lock member is arranged so as to overlap the second optical member in the orthogonal direction. The first lens barrel includes a first protrusion extending in the orthogonal direction.
The lock member includes a second protrusion extending in the orthogonal direction.
When the lock member is located at the lock position, the first protrusion and the second protrusion come into contact with each other at a position where they overlap with the second optical member in the orthogonal direction. The image shake correction device according to claim 1, wherein the movement of the lens barrel is restricted. The second lens barrel includes a holding surface for holding the second optical member.
The image shake correction device according to claim 1 or 2, wherein the lock member is held by the second lens barrel on a surface different from the holding surface. The image shake correction device according to any one of claims 1 to 3, wherein at least a part of the actuator overlaps with the second optical member in the orthogonal direction. The image shake correction device according to any one of claims 1 to 4,
An image pickup device including an image pickup element that photoelectrically converts light that has passed through the first optical member.