JP2010169844A - Optical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a collision noise generated when an optical element makes a collision with a mechanical stopper, in an optical device where the optical element is moved by a voice coil motor. <P>SOLUTION: The optical device has: the mechanical stoppers 6a and 306a disposed at the movable range ends of an optical element holding member 4 in an optical axis direction; the voice coil motor including a coil 401 and a magnet 402, for moving the optical element holding member in the optical axis direction; and a movable member 405 that does not come in contact with the optical element holding member in a first range among the movable range, and comes in contact with the optical element holding member that moves toward the mechanical stopper, in a second range nearer the mechanical stopper than the first range, and moves together with the optical element holding member. The movable member is configured to receive frictional force generated by attraction to a frictional surface 403 by magnetic force from the magnet, as a moving resistance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to an optical apparatus including an imaging device such as a video camera or a digital still camera, and an interchangeable lens.

Some of the optical devices described above use a voice coil motor to move an optical element such as a lens (actually a holding member that holds the optical element) in the optical axis direction. When turned off, the voice coil motor does not have a self-holding force. For this reason, when the optical device is shaken in the power OFF state, the optical element moves due to its own weight, and the optical element collides with a mechanical stopper provided at the end of the movable range, thereby generating a collision sound. .
In such an optical device, when the power is turned on, a reset operation is often performed in which the optical element is moved to a position that comes into contact with a mechanical stopper serving as a reference position (origin position) for detecting the position. Even in this reset operation, there is a possibility that the collision sound is generated.
Patent Document 1 discloses an optical device in which an elastic member is provided in the vicinity of the mechanical stopper in order to suppress the occurrence of a collision sound when the optical element strikes the mechanical stopper by manual zooming.
JP 9-318862 A

  However, when the elastic member is provided in the vicinity of the mechanical stopper, the deformation amount of the elastic member with which the optical element abuts in the reset operation may be slightly different for each reset operation. In this case, the origin position detected for each reset operation is different, and the position control of the optical element cannot be performed accurately.

  By applying a highly viscous grease between a guide bar for guiding the optical element in the optical axis direction and a sleeve portion provided on the optical element (holding member) and engaging the guide bar, There is a method of reducing the moving speed of the optical element (holding member) and reducing the collision noise. There is also a method for reducing the collision noise by bringing a damper (grease damper) using the viscosity of grease into contact with an optical element that has moved toward the mechanical stopper and reducing the moving speed of the optical element. .

However, in the former case, when the optical element is moved at a position away from the mechanical stopper, the viscosity of the grease becomes a movement resistance of the optical element, so that the output required for the voice coil motor is increased. This leads to an increase in size and, in turn, an increase in the size of optical equipment. In the latter case, the provision of the grease damper increases the cost and size of the optical device.
The present invention is an optical device that moves an optical element by using a voice coil motor, and can reduce the collision sound that occurs when the optical element collides with a mechanical stopper without causing inconvenience in detecting the origin position. A compact optical device is provided.

  An optical apparatus according to one aspect of the present invention includes an optical element holding member that holds an optical element and is movable in the optical axis direction, and a mechanical stopper provided at an end of a movable range of the optical element holding member in the optical axis direction. A voice coil motor that includes a coil and a magnet and moves the optical element holding member in the direction of the optical axis, and does not contact the optical element holding member in the first range of the movable range, and is more than the first range. And a movable member that contacts the optical element holding member that moves toward the mechanical stopper in the second range close to the mechanical stopper and moves together with the optical element holding member. The movable member is configured to receive, as a movement resistance, a frictional force generated by adsorption to a friction surface by a magnetic force from a magnet.

  According to the present invention, the movement resistance acts on the optical element holding member that moves toward the mechanical stopper in the second range via the movable member that is attracted to the friction surface by the magnetic force of the magnet. For this reason, the moving speed of the optical element holding member when abutting (collision) with the mechanical stopper can be reduced without the need for grease or a grease damper, and collision noise can be reduced. In addition, the movable member does not come into contact with the optical element holding member that moves in the first range, and the movement resistance does not act. For this reason, the enlargement of the voice coil motor can be avoided.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 shows a configuration of an imaging apparatus (optical apparatus: hereinafter referred to as a camera) such as a video camera or a digital camera according to an embodiment of the present invention. In FIG. 2, L represents a lens barrel capable of zooming, and B represents a camera body. In the camera body B, an image sensor for recording a subject image formed by the photographing optical system in the lens barrel L is provided.

  3 and 4 show the configuration of the lens barrel L shown in FIG. The photographing optical system has four lens units of convex, concave, convex, and convex arranged in order from the object side (left side of each figure: hereinafter also referred to as front side) to the image surface side (hereinafter also referred to as rear side). This is a variable magnification optical system (zoom lens system).

In these drawings, L1 is a first lens unit, and L2 is a second lens unit that performs a zooming action by moving in the optical axis direction.
L3 is a third lens unit that performs image blur correction (anti-shake) by moving (shifting) in a plane orthogonal to the optical axis (hereinafter referred to as an optical axis orthogonal plane), that is, in a direction orthogonal to the optical axis. It is. The third lens unit L3 includes a third-a lens subunit L3a and a third-b lens subunit L3b disposed on the image plane side with respect to the third-a lens subunit L3a. L4 is a fourth lens unit that performs focusing by moving in the optical axis direction.

  Reference numeral 1 denotes a front lens barrel that holds the first lens unit L1. Reference numeral 5 denotes a fixed mirror having a rear end coupled to a shift base 306 constituting a part of the shift base unit 302 and a front end coupled to the front lens barrel 1 in order to fix the first lens unit L1 in a predetermined position. It is a cylinder.

Reference numeral 2 denotes a variator moving frame that holds the second lens unit L2.
The shift unit 3 includes a shift magnet unit 301, a shift base unit 302, a holding frame 303 that holds the third-a lens subunit L3a, and a holding frame 304 that holds the third-b lens subunit L3a. After the holding frame 303 and the holding frame 304 are bonded together, the holding frame 303 is fixed to the shift magnet unit 301 with screws 305. Accordingly, the 3a and 3b lens subunits L3a and L3b and the shift magnet unit 301 can be integrally shifted with respect to the shift base unit 302 in the direction perpendicular to the optical axis.
Reference numeral 4 denotes a focus movement frame (optical element holding member) that holds the fourth lens unit (optical element) L4. Reference numeral 6 denotes a rear lens barrel that holds an image sensor (photoelectric conversion element: see 601 in FIG. 8) such as a CCD sensor or a CMOS sensor. The front end of the rear barrel 6 is coupled to the shift base 306.

  Reference numeral 8 denotes a first guide bar whose both ends are held by the fixed barrel 5 and the rear barrel 6. Further, both ends of a second guide bar (not shown) are held by the fixed barrel 5 and the shift base 306. Both ends of the third and fourth guide bars 10 and 11 are held by the shift base 306 and the rear barrel 6.

  The variator moving frame 2 is supported by the first and second guide bars 8 and 9 so as to be movable in the optical axis direction. The focus moving frame 4 is supported by the third and fourth guide bars 10 and 11 so as to be movable in the optical axis direction.

  After the shift unit 3 (shift base 306) is positioned with respect to the fixed barrel 5, it is sandwiched between the rear barrel 6 and the fixed barrel 5 and coupled thereto.

  Reference numeral 7 denotes a light amount adjusting unit that adjusts the amount of light that passes through the photographing optical system and enters the image sensor, and moves the two diaphragm blades in the direction perpendicular to the optical axis to change the aperture diameter. Further, the light amount adjustment unit 7 is provided with a gradation ND filter 706 so that it can advance and retreat with respect to the optical path independently of the aperture blade. The light quantity adjustment unit 7 is fixed to the shift base 306 with screws.

  The rear lens barrel 6 is positioned with respect to the fixed lens barrel 5 and is fixed to the fixed lens barrel 5 with screws after sandwiching the shift base 306 as described above.

  A stepping motor 201 moves the second lens unit L2 in the optical axis direction. A lead screw 202 is formed on the output shaft of the stepping motor 201. The stepping motor 201 is fixed to the fixed barrel 5 with a screw via a support member 210. A rack 203 attached to the variator moving frame 2 is engaged with the lead screw 202. For this reason, when the stepping motor 201 is energized and the lead screw 202 rotates, the second lens unit L2 is driven in the optical axis direction.

  Note that the rack 203, the variator moving frame 2, the first and second guide bars 8 and 9, and the lead screw 202 are prevented from rattling by the biasing force of the torsion coil spring 204.

  Reference numeral 205 denotes a zoom reset switch for detecting a reference position (origin position) of the variator moving frame 2. The zoom reset switch 205 is configured by a photo interrupter that detects switching between a light shielding state and a non-light shielding state due to movement of the light shielding portion 206 formed in the variator moving frame 2 in the optical axis direction. The zoom reset 205 is fixed to the fixed barrel 5 with screws 207 through the substrate.

Reference numerals 401, 402, and 403 respectively denote a drive coil, a drive magnet, and a yoke that constitute a focus motor as a voice coil motor that drives the fourth lens unit L4 in the optical axis direction. The yoke 403 is a member for closing the magnetic flux generated between the drive coil 401 and the drive magnet 402. The yoke 403 has a U shape in a side view, and the drive magnet 402 is attracted to the lower surface of the upper arm portion of the U shape. The U-shaped front opening in the yoke 403 is closed by another yoke.
When the drive coil 401 is energized, Lorentz force is generated due to the repulsion of the lines of magnetic force generated between the drive coil 401 and the drive magnet 402, and the fourth lens unit L4 is moved together with the focus moving frame 4 holding the drive coil 401. Move in the direction of the optical axis.
The focus movement frame 4 holds a sensor magnet 404 that is multipolarly magnetized in the optical axis direction. An MR sensor 405 for reading a change in magnetic field lines accompanying the movement of the sensor magnet is fixed by a screw at a position facing the sensor magnet in the rear barrel 6. By using the signal from the MR sensor 405, it is possible to detect the amount of movement, that is, the position of the focus movement frame 4 (fourth lens unit L4) from a reference position (origin position) described later.
In FIG. 3, illustration of a movable stopper 405 described later is omitted.

  FIG. 8 shows the electrical configuration of the camera of this embodiment. In this figure, the same reference numerals as those in FIGS. 2 to 6 are assigned to the components of the lens barrel described in FIGS.

  Reference numeral 201 denotes a stepping motor (hereinafter referred to as a zoom motor) which is a drive source of the second lens unit L2. Reference numeral 401 denotes a drive coil of a voice coil motor (VCM) that is a drive source of the fourth lens unit L4.

  Reference numeral 35 denotes an aperture motor that is a drive source of the light amount adjusting unit 7, and a stepping motor or the like is used.

  Reference numeral 205 denotes a zoom reset switch composed of a photo interrupter. After the zoom reset switch 205 detects that the second lens unit L2 is positioned at the reference position, the number of pulse signals input to the zoom motor 201 is continuously counted. Thereby, the movement amount (position with respect to the reference position) in the optical axis direction of the second lens unit L2 can be detected.

  Reference numeral 709 denotes a diaphragm encoder, which employs a system in which a Hall element is disposed in the diaphragm motor 35 and the rotational position of the rotor of the diaphragm motor 35 with respect to the stator is detected.

Reference numeral 37 denotes a control circuit composed of a CPU or the like that controls the camera. A camera signal processing circuit 38 performs signal processing such as predetermined amplification and gamma correction on the output from the image sensor 601. The contrast signal of the video signal subjected to these processes is supplied to the AE gate 39 and the AF gate 40.
Each of the AE gate 39 and the AF gate 40 sets an optimum signal extraction range for exposure control and focusing from the video signals of the entire screen. In some cases, the size of the gate is variable or a plurality of gates are provided.

  Reference numeral 41 denotes an AF signal processing circuit that processes an AF signal for AF (autofocus), and generates one or a plurality of outputs related to high-frequency components of the video signal.

  Reference numeral 42 is a zoom switch, and 43 is a zoom tracking memory. The zoom tracking memory 43 stores position information of the focus lens (fourth lens unit L4) corresponding to the subject distance and the position of the variator (second lens unit L2) during zooming. Note that the memory in the control circuit 37 may be used as the zoom tracking memory.

  For example, when the zoom switch 42 is operated by the photographer, the control circuit 37 controls the drive of the zoom motor 201 to move the second lens unit L2. At the same time, the control circuit 37 calculates the position of the fourth lens unit L4 relative to the movement position of the second lens unit L2 (position for maintaining the in-focus state) based on the information in the zoom tracking memory 43. Then, energization to the drive coil 401 of the voice coil motor is controlled so that the fourth lens unit L4 is moved to the calculated position.

  In the autofocus operation, the control circuit 37 controls energization to the drive coil 401 of the voice coil motor so that the output of the AF signal processing circuit 41 shows a peak.

  Further, in order to obtain an appropriate exposure, the control circuit 37 uses the average value of the output of the luminance (Y) signal that has passed through the AE gate 39 as a reference value, so that the output of the aperture encoder 709 becomes this reference value. The drive of 35 is controlled and the light quantity is controlled.

Reference numerals 51 and 52 denote shake sensors that detect shakes in the pitch direction and yaw direction of the camera. The control circuit 37 energizes the drive coil 308 of the vibration-proof actuator based on the outputs from the shake sensors 51 and 52 and the shift position of the third lens unit L3 detected by a shift position sensor (not shown). Control. As a result, the third lens unit L3 shifts and image blur due to camera shake is reduced.
Next, the configuration of the focus driving unit that drives the focus moving frame 4 will be described with reference to FIGS. 1, 5, 6, and 7. FIG. FIGS. 1A to 1E show a state in which the focus moving frame 4 is driven in the optical axis direction by the focus driving unit. FIG. 5 is a diagram showing the focus driving unit as seen from the front direction (first lens unit L1 side). FIG. 6A and FIG. 6B are views showing the focus driving unit as seen from the side surface direction and the top surface direction, respectively. FIGS. 7A to 7F are views showing the relationship between a protruding portion (contact portion) 4a which is a part of the moving focus moving frame 4 and a movable stopper (movable member) 405 described later.

As described above, the voice coil motor drives the focus moving frame 4 in the optical axis direction by energizing the drive coil 401. However, since the voice coil motor does not have a self-holding force when the drive coil 401 is not energized, the focus moving frame 4 can freely move along the guide bars 10 and 11. In other words, when the camera is turned off (power is turned off), the focus moving frame 4 can move to the end of its movable range each time the camera is tilted by being swung in the front-down state or the back-down state. There is sex.
At both ends of the movable range of the focus moving frame 4, as shown in FIG. 7A, mechanical stoppers 306a and 6a provided on the shift base 306 and the rear barrel 6 are formed as protrusions. For this reason, when the focus moving frame 4 that freely moves collides with the mechanical stoppers 306a and 6a, there is a possibility that a collision sound is generated.
Therefore, in this embodiment, the movable stopper 405 that is movable in the optical axis direction while being attracted to the yoke 403 by the magnetic force from the drive magnet 402 is used to connect the upper surface of the upper arm portion of the yoke 403 (the drive magnet 402 in the arm portion is attracted). It is placed on the opposite side of the surface. The magnetic force from the drive magnet 402 is transmitted to the outside of the voice coil motor through the yoke 403, and the movable stopper 405 is attracted to the drive magnet 402 side by the leaked magnetic force and is attracted to the upper surface of the yoke 403. The movable stopper 405 is held by the rear barrel 6 so as to be movable only in the optical axis direction. The upper surface of the yoke 403 is not a smooth surface but is formed as a friction surface having a certain degree of surface roughness.
A frictional force in the optical axis direction is generated between the friction surface of the yoke 403 and the movable stopper 405 adsorbed on the friction surface. This frictional force becomes a movement resistance for the movable stopper 405 that moves in the optical axis direction. As described above, the focus drive unit is configured such that the movable stopper 405 receives, as a movement resistance, the frictional force generated by the adsorption to the yoke 403 by the magnetic force from the drive magnet 402.
When the frictional force acting between the movable stopper 405 and the yoke 403 is set so that the focus moving frame 4 starts to move with a driving force of about 1 to 2 times its own weight of the focus moving frame 4 including the fourth lens unit L4. Good.
Stopper portions 405a and 405b are provided at both ends of the movable stopper 405 in the optical axis direction, and a protrusion 4a provided on the focus moving frame 4 is disposed between the stopper portions 405a and 405b.
The focus moving frame 4 is movable in the optical axis direction within a movable range in which both ends are determined by the mechanical stoppers 306a and 6a. However, as shown in FIGS. 7B and 7D, the movable stopper 405 moves in the range (first range) between the infinite end and the closest end in normal shooting with the power on. The protrusions 4a of the frame 4 are formed so that the stoppers 405a and 405b do not come into contact with each other. For this reason, in normal shooting, the focus moving frame 4 does not receive movement resistance via the movable stopper 405, and the driving force required for the voice coil motor is increased, or the accuracy of position control of the focus moving frame 4 is reduced. There is nothing to do.
On the other hand, in the power OFF state, the focus moving frame 4 can move to a position (second range) closer to the mechanical stoppers 306a and 6a than the first range, in other words, to a position where the focus moving frame 4 contacts the mechanical stoppers 306a and 6a. It is. As shown in FIGS. 7B, 7C, 7E, and 7F, the movable stopper 405 is a protrusion 4a of the focus moving frame 4 that moves toward the mechanical stoppers 306a and 6a in the second range. Is formed so as to contact the stopper portions 405a and 405b.
The focus moving frame 4 that moves from the first range toward the mechanical stopper 306a or 6a has a protruding portion 4a of the stopper portion 405a or 405b of the movable stopper 405, as shown in FIGS. 7B and 7E. Abut.
Here, when the camera is shaken, the self-weight including the fourth lens unit L4 and the centrifugal force generated by shaking the imaging device act on the focus moving frame 4 within the first range. If the movement of the focus moving frame 4 accelerated by the self weight and the centrifugal force is received by the frictional force generated between the movable stopper 405 and the yoke 403, the focus moving frame 4 is moved to the first range by the movable stopper 405. Stopped at the end. In this case, a collision sound between the focus moving frame 4 and the mechanical stoppers 306a and 6a is not generated.
However, when the movement of the focus moving frame 4 cannot be received by the frictional force, the focus moving frame 4 is moved to the mechanical stopper 306a or 6a with the movable stopper 405 as shown in FIGS. Move towards. As described above, the movable stopper 405 moves in the optical axis direction together with the focus moving frame 4 while receiving the movement resistance in a state where the protrusion 4a of the focus moving frame 4 is in contact with the stopper portions 405a and 405b.
At this time, the focus moving frame 4 that moves toward the mechanical stoppers 306a and 6a receives movement resistance via the movable stopper 405, and thus moves at a lower speed than when the movement resistance is not received. Therefore, even when the focus moving frame 4 collides with the mechanical stoppers 306a and 6a as shown in FIGS. 7C and 7F, the collision speed is low, and as a result, the collision sound can be reduced.
Further, as described above, the projection 4a of the focus moving frame 4 accelerated in the first range is also applied to the stoppers 405a and 405b of the movable stopper 405 as shown in FIGS. 7 (b) and 7 (e). It will collide. However, the stopper portions 405a and 405b of the movable stopper 405 are provided on the first range side with respect to the mechanical stoppers 306a and 6a. For this reason, the movable stopper 405 is not provided, and the arrival speed of the accelerated focus movement frame 4 is lower than when the focus movement frame 4 collides with the mechanical stoppers 306a and 6a as they are. For this reason, the collision sound between the focus moving frame 4 and the movable stopper 405 hardly causes a problem.
The movable stopper 405 that has moved to the one end side in the optical axis direction together with the focus movement frame 4 stays at the one end side when the focus movement frame 4 moves to the other end side in the optical axis direction. Do not move. For this reason, when the focus movement frame 4 is moved again to the one end side in a state where the movable stopper 405 is located on the one end side in the optical axis direction, the focus movement frame 4 and the mechanical stopper collide, and an impact sound is generated. appear.
However, normally, when the imaging apparatus is shaken, the front-falling state and the rear-falling state are alternately generated, and the focus moving frame 4 often moves alternately to one end side and the other end side in the optical axis direction. Therefore, it is considered that impact noise is not a problem.
Further, when the power is turned on or when the power is turned on, the control circuit (control means) 37 controls the driving of the voice coil motor (energization to the drive coil 401), and moves the focus moving frame 4 to the mechanical stopper. It is moved to a position where it abuts against 306a or 6a.
Then, the control circuit 37 sets the position at which the focus moving frame 4 is in contact with the mechanical stopper 306a or 6a as a reference position (origin position) for position control of the focus moving frame 4. Such a reference position detection operation is also referred to as a reset operation.
In order to perform the reset operation, the driving force of the voice coil motor is set to a size that allows the focus moving frame 4 that receives the movement resistance via the movable stopper 405 to move against the movement resistance. However, since the driving force of the original voice coil motor is large enough to move the focus moving frame 4 without providing the movable stopper 405, the voice coil motor is provided simply because the movable stopper 405 is provided. There is no need to increase the driving force.
Even in the reset operation, the focus moving frame 4 comes into contact with the movable stopper 405 before the mechanical stopper, and the focus moving frame 4 moves while receiving movement resistance through the movable stopper 405. For this reason, the moving speed of the focus moving frame 4 in the reset operation can be suppressed to be lower than the moving speed in the reset operation when the movable stopper 405 is not present. Therefore, it is possible to reduce the occurrence of a collision sound due to the collision between the focus moving frame 4 and the mechanical stopper in the reset operation.
However, in order to improve the reproducibility of the reference position detected for each reset operation, there may be a case where the contact force of the focus moving frame 4 with respect to the mechanical stopper should be constant for each reset operation. In this case, the control circuit 37 moves the focus moving frame 4 together with the movable stopper 405 to a position where it abuts on the mechanical stopper, and then drives the voice coil motor to move the focus moving frame 4 slightly away from the mechanical stopper. Control. Then, the driving of the voice coil motor is controlled again so that the focus moving frame 4 is moved to a position where it comes into contact with the mechanical stopper. As a result, as in the case where there is no movable stopper 405, an accurate reference position can be detected for each reset operation.

  As described above, in this embodiment, the movable stopper 405 is attracted to the yoke 403 using the magnetic force from the drive magnet 402, and a stable friction force is generated between the movable stopper 405 and the yoke 403. Then, immediately before the focus moving frame 4 moving toward the mechanical stopper comes into contact with the mechanical stopper, the focus moving frame 4 is brought into contact with the movable stopper 405, and thereafter, the focus moving frame 4 is moved together with the movable stopper 405. As a result, even when a collision of the focus moving frame 4 with the mechanical stopper occurs, the collision speed becomes slow, so that the collision sound can be reduced.

FIG. 9 shows a configuration of a focus drive unit of a camera that is Embodiment 2 of the present invention. In the first embodiment, the case where the movable stopper 405 is provided so as to be movable in the optical axis direction has been described. However, the movable stopper 1405 of the present embodiment can be rotationally moved as shown in FIG.
The basic configuration of the camera of the present embodiment and the point of performing the reset operation are the same as those of the camera of the first embodiment, and thus description thereof is omitted.
In FIG. 9, 1402 is a drive magnet for the voice coil motor, and 1403 is a yoke. Similar to the first embodiment, the drive magnet 1402 is attracted to the lower surface of the upper arm portion of the yoke 1403 having a U-shape in a side view. In FIG. 9, the driving coil of the voice coil motor is not shown.
A hole is formed in the upper surface of the upper arm of the yoke 1403, and a pin 1403a is press-fitted into the hole. The movable stopper 1405 is held so as to be rotatable along the upper surface of the upper arm portion of the yoke 1403 around the pin 1403a.
The movable stopper 1405 is attracted to the upper surface (friction surface) of the upper arm portion of the yoke 1403 by the magnetic force from the drive magnet 1402. For this reason, a frictional force with respect to the rotation of the movable stopper 1405 is generated between the movable stopper 1405 and the yoke 1403.
At both ends of the movable stopper 1405, stopper portions 1405a and 1405b are provided. A protrusion (contact portion) 1004a which is a part of the focus moving frame is disposed between the stopper portions 1405a and 1405b.
Also in this embodiment, when the focus movement frame moves within the first range described in the first embodiment, the protrusion 1004a does not contact the stopper portions 1405a and 1405b. However, when the focus movement frame moves toward the mechanical stopper (306a, 6a in FIG. 7) in the second range, the protrusion 1004a abuts against the stopper portion 1405a or 1405b, and the focus movement frame becomes the movable stopper 1405. Move while rotating.
For this reason, the focus movement frame receives the friction force as a movement resistance via the movable stopper 1405. Therefore, in both the power OFF state and the power ON state, the moving speed of the focus moving frame that moves toward the mechanical stopper in the second range decreases, and even if the focus moving frame collides with the mechanical stopper, the collision sound is reduced. The
Each embodiment described above is only a representative example, and various modifications and changes can be made to each embodiment in carrying out the present invention.
For example, in the above embodiment, the case where the movable stopper 405 is attracted to the friction surface of the yoke 403 has been described. However, a configuration in which the movable stopper is attracted to another friction surface (for example, a friction surface formed on the drive magnet or a friction surface formed on a member other than the drive magnet and the yoke) may be employed.

  In the above embodiments, the lens-integrated imaging device has been described. However, the present invention can be attached to and detached from the imaging device, and can be applied to an interchangeable lens including a photographing optical system.

FIG. 3 is a perspective view illustrating an operation state of a focus driving unit in the camera that is Embodiment 1 of the present invention. FIG. 3 is a perspective view illustrating an appearance of the camera according to the first embodiment. 2 is an exploded perspective view of a lens barrel mounted on the camera of Embodiment 1. FIG. Sectional drawing of the said lens-barrel. The front view which shows the structure of the focus drive part provided in the said lens-barrel. FIG. 4 is a side view and a top view showing the configuration of the focus driving unit. The figure which showed typically the mode of operation | movement of the movable stopper provided in the part for the said focus drive. FIG. 3 is a block diagram illustrating an electrical configuration of the camera according to the first embodiment. FIG. 6 is a top view and a side view illustrating a configuration of a focus driving unit of a camera that is Embodiment 2 of the present invention.

L lens barrel B camera L1 first lens unit L2 second lens unit L3 third lens unit L3a 3a lens subunit L3b 3b lens subunit L4 fourth lens unit 1 front lens barrel 2 variator moving frame 3 shift unit 4, 1004 Focus moving frame 5 Fixed barrel 6 Rear barrel 6a, 306a Mechanical stopper 7 Light amount adjustment unit 401 Driving coil 402, 1402 Driving magnet 403, 1403 Yoke 405, 1405 Movable stopper 601 Imaging element

Claims (4)

An optical element holding member that holds the optical element and is movable in the optical axis direction;
A mechanical stopper provided at an end of a movable range of the optical element holding member in the optical axis direction;
A voice coil motor including a coil and a magnet, and moving the optical element holding member in the optical axis direction;
The optical element holding member that does not contact the optical element holding member in the first range of the movable range and moves toward the mechanical stopper in a second range closer to the mechanical stopper than the first range. A movable member that contacts the member and moves together with the optical element holding member;
An optical apparatus, wherein the movable member is configured to receive, as a movement resistance, a friction force generated by adsorption to a friction surface by a magnetic force from the magnet. The voice coil motor includes a yoke,
The optical apparatus according to claim 1, wherein the movable stopper is attracted to a friction surface of the yoke or the magnet having the friction surface. Control means for controlling the position of the optical element holding member by controlling the driving of the voice coil motor;
The control means moves the optical element holding member to a position where the optical element holding member comes into contact with the mechanical stopper, and performs an operation of detecting an origin position in position control of the optical element holding member. The optical apparatus described in 1. In the operation of detecting the origin position, the control means moves the optical element holding member to a position where the optical element holding member abuts on the mechanical stopper, moves the optical element holding member in a direction away from the mechanical stopper, and again contacts the mechanical stopper. The optical apparatus according to claim 3, wherein the voice coil motor is controlled so as to be in contact.