JP2008286929A - Shake correction device and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shake correction device which obtains viscous drag suitable for image blur correction, and attains improvement in mass production stability and assembly stability and reduction of cost by unitizing a damper means. <P>SOLUTION: The shake correction device has a movable member 38 integrally supporting a correction means 12, and a fixed member 31 movably holding the movable member and has the damper means 39a and 39b constituted by unitizing a first attaching part 44a attached to the fixed member; a second attaching part 46a attached to the movable member; and a damping means 45a viscoelastically supporting a part between the first attaching part and the second attaching part and braking the correction means in the moving direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a shake correction apparatus that corrects image shake due to camera shake and the like, and an imaging apparatus having the shake correction apparatus.

  With the current camera, all the important tasks for shooting such as determining exposure and focusing are automated, and it is very unlikely that people who are unskilled in camera operation will fail to shoot. In recent years, a shake correction unit that corrects an image shake due to a shake such as a camera shake applied to a camera has been installed in many products, and there is almost no cause of a photographer's shooting mistake.

  Here, the shake correction unit will be briefly described. Camera shake, which is a typical example of camera shake at the time of shooting, is normally 1 Hz to 10 Hz as a frequency. In order to be able to take pictures without image shake even when the above-mentioned camera shake occurs at the time of shooting, the correction optical system detects the camera shake due to camera shake and cancels the shake according to the detected value. Is displaced. For this reason, firstly, it is necessary to accurately detect camera shake, and secondly, it is necessary to correct an optical axis change due to camera shake.

  In principle, shake detection such as camera shake is performed by detecting acceleration, angular acceleration, angular velocity, angular displacement, and the like and mounting a means for appropriately calculating the output for camera shake correction. Then, based on this detection information, the correction optical system that decenters the photographing optical axis is driven (moved in a plane orthogonal to the optical axis) to suppress image blur.

  As disclosed in Patent Document 1, the shake correction unit is configured to detect camera shake based on a gyro signal and correct image shake by moving a part of the optical system (correction optical system). Many things are used.

As a desirable characteristic of the mechanism constituting the shake correction unit,
1) Friction is small and tracking of the target is good. 2) The frequency characteristic is easy for the designer to operate. Various mechanisms have been proposed to achieve these.

  The feature of the mechanism disclosed in Patent Document 2 is that an elastic means and a viscosity means for restricting the displacement of the correction means and the movable portion are provided. By adopting such a mechanism, so-called open control is possible and the frequency characteristic is improved.

The feature of the mechanism disclosed in Patent Document 3 is that a plurality of balls are sandwiched between a movable lens barrel and a fixed lens barrel and pressed by an elastic body. With such a configuration, the movable lens barrel can be driven by rolling friction, and the frictional force can be reduced. Further, since the resonance frequency is determined by the ratio of the weight of the movable lens barrel and the elastic coefficient of the elastic body, the target resonance frequency can be easily obtained. As a result, a good controllability can be obtained, and the mechanism can respond appropriately even to small vibrations.
JP 60-143330 A JP-A-8-184870 JP 2001-290184 A

  According to Patent Document 2, viscous resistance can be obtained by a mechanical or electrical method. However, according to the mechanical method, since the place where the viscous means is provided is the L-shaped guide bar portion, there are problems such as difficulty in assembling and a complicated structure. In addition, according to the electrical method, there is a problem that the control system is easily affected by variations in the control target and the control system becomes complicated.

  According to Patent Document 3, it can be driven with very small friction, and can follow small camera shake. However, there is a problem that since there is no appropriate viscous resistance, the influence of main resonance and sub-resonance is large, and it is easily affected by disturbance.

(Object of invention)
The object of the present invention is to obtain a viscous resistance suitable for image shake correction, and to improve the mass production stability and assembly stability by unitizing the damper means, thereby reducing the cost. An apparatus and an imaging apparatus are to be provided.

  In order to achieve the above object, the present invention includes a correction unit that corrects image blur, a movable member that integrally supports the correction unit, and a fixed member that holds the movable member movably. In a shake correction apparatus that corrects image shake due to shake by moving the correction means in a plane orthogonal to the optical axis of the imaging optical system via a movable member, the first attachment portion attached to the fixed member; A second attachment portion attached to the movable member and a damping means for supporting viscoelasticity between the first attachment portion and the second attachment portion are formed as a unit, and the correction means moves in the moving direction. This is a shake correction device having a damper means for braking.

  Similarly, in order to achieve the above object, the present invention provides an imaging apparatus having the shake correction apparatus of the present invention.

  According to the present invention, it is possible to obtain a viscous resistance suitable for image shake correction, and to improve the mass production stability and the assembly stability by unitizing the damper means so that the shake reduction can be achieved. A device or an imaging device can be provided.

  The best mode for carrying out the present invention is as shown in Examples 1 to 3 below.

  An imaging apparatus having a shake correction function according to the first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an optical layout diagram of an imaging apparatus provided with a shake correction unit which is a shake correction apparatus described later. In FIG. 1, 1 is an imaging device, 2 is an imaging lens, 3 is a lens drive control unit, 4 is an optical axis of an imaging lens 2 that is an imaging optical system, and 5 is a lens barrel. Reference numeral 6 denotes an image sensor, 7 denotes a memory, 8 denotes a shake sensor for detecting shake such as camera shake, and 9 denotes a shake correction unit including a correction optical system described later. Reference numeral 10 denotes a power source, 11 denotes a release button, 12 denotes a correction optical system that is correction means included in the imaging lens 2, 13 denotes a so-called quick return mirror, and 14 denotes a finder optical system.

  The imaging device 1 forms a subject image in the vicinity of the imaging device 6 using the imaging lens 2 and a focus adjustment unit (not shown). Further, information on the subject is obtained from the image sensor 6 in synchronization with the operation of the release button 11 by the user, and is recorded in the memory 7.

  Next, image shake correction due to shake such as camera shake will be described. For example, when camera shake is applied during exposure or the like, the camera shake correction unit 9 is driven in a direction to suppress camera shake via the lens drive control unit 3 based on the signal of the camera shake sensor 8. Specifically, the correction optical system 12 provided in the shake correction unit 9 is moved in a plane orthogonal to the optical axis 4. Thereby, the shake of the image on the image sensor 6 is reduced, and the deterioration of the image due to the hand shake can be prevented.

  FIG. 2 is a block diagram illustrating an electrical configuration of the imaging apparatus 1. The imaging device 1 has an imaging system, an image processing system, a recording / reproducing system, and a control system. The imaging system includes an imaging lens 2 and an imaging element 6, and the image processing system includes an A / D converter 20 and an image processing unit 21. The recording / reproducing system includes a recording processing unit 23 and a memory 24, and the control system includes a camera system control unit 25, an AF sensor 26, an AE sensor 27, a shake sensor 8, an operation detection unit 29, and a lens system control unit 30. including.

  The imaging system is an optical processing system that forms an image of light from an object on the imaging surface of the imaging device 6 via the imaging lens 2, and an appropriate amount of light using a diaphragm (not shown) based on a signal from the AE sensor 27. The subject light is exposed to the image sensor 6. The image processing unit 21 included in the image processing system processes the image signal from the image sensor 6 via the A / D converter 20, and increases the resolution by a white balance circuit, a gamma correction circuit, and an interpolation operation. It has an interpolation calculation circuit and the like. A recording processing unit 23 included in the recording / reproducing system outputs an image signal to the memory 24 and generates and stores an image to be output to the display unit 22. Further, the recording processing unit 23 compresses images and moving images using a predetermined method.

  The control system controls the imaging system, the image processing system, and the recording / reproducing system in response to a detection signal from the operation detection unit 29 that detects the operation of the release button 11 and the like. The camera system control unit 25 included in this control system generates and outputs a timing signal at the time of shooting. The AF sensor 26 detects the focus state of the imaging apparatus 1. The AE sensor 27 detects the luminance of the subject. The shake sensor 8 detects shake such as hand shake. The lens system control unit 30 appropriately controls the lens and the like according to the signal from the camera system control unit 25.

  The control system controls the imaging system, the image processing system, and the recording / reproducing system in response to external operations as described above. For example, the pressing of the release button 11 is detected to control the driving of the image sensor 6, the operation of the image processing unit 21, the compression processing of the recording processing unit 23, and the like. Further, the display unit 22 controls the state of each segment of the information display device that displays information on an optical finder, a liquid crystal monitor, or the like.

  The camera system control unit 25 is connected to the AF sensor 26 and the AE sensor 27, and appropriately controls lenses, a diaphragm, and the like based on signals from these. Further, the camera system control unit 25 is connected to the shake sensor 8, and drives the shake correction unit 9 based on a signal from the shake sensor 8 in a mode in which image shake correction is performed.

  The main part of the shake correction unit 9 according to the first embodiment will be described with reference to FIGS. 3 to 11.

  3 is a perspective view of the shake correction unit 9, and FIG. 4 is an exploded perspective view of the shake correction unit 9 viewed from the subject side.

  3 and 4, reference numeral 31 denotes a base plate as a fixed member, 38 denotes a movable lens barrel (movable member), and 2a, 32b, and 32c denote spheres held between the base plate 31 and the movable lens barrel 38. Reference numeral 12 denotes a correction optical system that is fixed to the movable lens barrel 38 and corrects image shake during shooting. 33a and 33b are coils, 34a and 34b are magnets, 35 is a yoke (magnet adsorption plate), and 36a and 36b are adsorption plate fixing screws. Reference numerals 37a, 37b and 37c are elastic bodies made of springs. Reference numerals 39a and 39b denote damper units which are damper means for applying braking in the moving direction of the correction optical system 12, that is, providing viscous resistance suitable for vibration.

  From FIG. 3 to FIG. 9, which will be described later, only the main part of the shake correction unit 9 is shown, and the holding members, lead wires, and the like are not shown.

  The relative movement of the base plate 31 and the movable lens barrel 38 will be described with reference to FIGS.

  The correction optical system 12 is fixed to a movable lens barrel 38 that can move in the X and Y directions with respect to the base plate 31. The base plate 31 and the movable lens barrel 38 hold spheres 32a, 32b, and 32c, and perform relative motion via the spheres 32a, 32b, and 32c. For this reason, relative motion can be performed only under the influence of very small friction called rolling friction. Since the friction is small, it can respond appropriately even to a very small input. In addition, by manufacturing the guide surfaces by the balls 32a, 32b, and 32c with appropriate accuracy, even when the base plate 31 and the movable lens barrel 38 move relative to each other, the tilt of the movable lens barrel 38 and the direction of the optical axis can be improved. Unnecessary movement does not occur.

  FIG. 5 is a configuration diagram of the shake correction unit 9. Specifically, FIG. 5A is a front view seen from the optical axis direction, FIG. 5B is a cross-sectional view taken along the line AA in FIG. 5A, and FIG. 5C is a cross-sectional view taken along the line B- in FIG. B sectional drawing and FIG.5 (d) are CC sectional drawing in Fig.5 (a).

  As shown in FIG. 5A, the movable lens barrel 38 is elastically supported by the plurality of elastic bodies 37a, 37b, and 37c with respect to the base plate 31. In the first embodiment, three elastic bodies 37a, 37b, and 37c are arranged radially from the optical axis at intervals of 120 degrees. By adopting such a symmetrical arrangement, it is possible to suppress excitation of unnecessary resonance due to generation of moment. Furthermore, it is possible to prevent the correction optical system 12 from drooping when the power is turned off, so that an expensive lock mechanism or the like is not required, and the cost can be reduced.

  Further, by being elastically supported by the plurality of elastic bodies 37a, 37b, 37c, the movable center of the correction optical system 12 can always be positioned at the center of the optical axis, and an expensive position detection device for the correction optical system 12 can be provided. The feedback control used is not necessary. Thus, cost reduction can be achieved. A method for determining the elastic coefficients of the elastic bodies 37a, 37b, and 37c will be described later.

  As shown in FIG. 5 (b), the elastic bodies 37a, 37b, 37c are attached with appropriate inclination in the direction of the optical axis, and balls 32a, 32b, provided between the base plate 31 and the movable lens barrel 38, 32c is held.

  As shown in FIG. 5C, the coil 33 a (33 b) is fixed to the base plate 31, and the magnet 34 a (34 b) and the yoke 35 are fixed to the movable lens barrel 38. These constitute a so-called moving magnet type actuator (driving means).

  In FIG. 5A, the first electromagnetic actuator is disposed on the upper right side of the movable lens barrel 38 in the drawing. The first electromagnetic actuator includes a coil 33 a attached to the base plate 31, a magnet 34 a attached to the movable lens barrel 38, and a yoke 35. Further, a second electromagnetic actuator is disposed on the upper left side of the movable lens barrel 38 in the drawing. The second electromagnetic actuator includes a coil 33 b attached to the base plate 31, a magnet 34 b attached to the movable lens barrel 38, and a yoke 35.

  Next, attachment of the damper units 39a and 39b as damper means will be described.

  In FIG. 5D, 44a and 44b are damper holding frames of the damper units 39a and 39b, 45a and 45b are damping means, and 46a and 46b are damper resistance bars. The damper units 39a and 39b are attached to columnar holes 31a and 31b (see FIG. 4) provided in the base plate 31 by adhesion or the like. The damper resistance rods 46a and 46b are inserted into cylindrical holes 38a and 38b (see FIG. 4) provided in the movable lens barrel 38, and fixed by adhesion or the like.

  It is desirable that a plurality of damper units 39a and 39b be provided symmetrically with respect to the optical axis. In the first embodiment, as shown in FIG. 5D, two are provided at positions symmetrical with respect to the optical axis 4. By providing symmetrically with respect to the optical axis 4, when the base plate 31 and the movable lens barrel 38 perform relative motion, no moment is generated in the movable lens barrel 38 due to the force received from the damper units 39a and 39b.

  FIG. 6 is a detailed view of the damper unit 39a. FIG. 6A is a top view thereof, and FIG. 6B is a side view thereof. The damper unit 39b is the same.

  The damper resistance rod 46a is disposed so as to be substantially concentric with respect to the damper holding frame 44a, and a damping means 45a is provided in a donut shape in the gap. Although various viscoelastic bodies can be used for the attenuating means 45a, in the first embodiment, an ultraviolet ray or a thermosetting silicone gel excellent in assembling property and environmental resistance is used. The damping means 45a and 45b viscoelastically support between the damper holding frames 44a and 44b and the damper resistance rods 46a and 46b. Desirable characteristics of the viscoelastic body used as the damping means 45a and 45b will be described later.

  Here, in the first embodiment, the damper units 39a and 39b are attached to the cylindrical holes 31a and 31b (see FIG. 4) provided on the base plate 31, and the damper resistance rods 46a and 46b are attached to the movable lens barrel 38. Glued. However, a cylindrical hole may be provided on the movable lens barrel 38, a damper unit may be attached thereto, and the damper resistance rod may be bonded to the base plate 31.

  Next, the drive means of the shake correction unit 9 will be described with reference to FIG. 7A and 7B are schematic views of the driving means. FIG. 7A is a view showing only the magnet and the coil from the optical axis direction, and FIG. 7B is a cross-sectional view when the magnet is cut near the center. Yes.

  7A and 7B, reference numeral 43 denotes a magnetization boundary. In FIG. 7B, reference numerals 42a, 42b, and 42c schematically represent typical magnetic lines of force near the magnet 34a and the coil 33a.

  As shown in FIG. 7A, the magnet 34a is magnetized in two regions 34a1 and 34a2 across the magnetization boundary 43. At this time, the magnetization boundary 43 is a direction orthogonal to the direction of the force generated by the driving means, and there is a magnetization boundary in the vertical direction of FIG. The coil 33a has an oval shape when viewed from the optical axis direction, and is disposed so that the two longitudinal portions 33a1 and 33a2 face the two regions 34a1 and 34a2 of the magnet.

  Moreover, as shown in FIG.7 (b), the yoke 35a exists in the surface on the opposite side to the coil 33a of the magnet 34a. The yoke 35a is preferably a soft magnetic material, which allows a large amount of magnetic flux to pass therethrough and lowers the permeance of the magnetic circuit. As a result, lines of magnetic force are generated relatively linearly between the magnet 34a and the coil 33a as in 42a and 42b.

  Since the yokes 35a and 35b functioning as the magnet attracting plates are fixed to the movable lens barrel 38 in the first embodiment, the thickness of the movable part increases as the thickness increases. Therefore, it is preferable to determine the yokes 35a and 35b to be in the vicinity of the saturation magnetic flux in consideration of the outer shape of the yokes 35a and 35b, the saturation magnetic flux density and the magnet shape, the surface magnetic flux density, and the like. When the coil 33a is energized in this state, a current flows in the opposite direction to the two longitudinal portions 33a1 and 33a2 in the direction perpendicular to the paper surface of FIG. Therefore, a driving force is generated according to the Fleming left-hand rule. Since the movable lens barrel 38 is elastically supported as described with reference to FIG. 6A, the relative position between the base plate 31 and the movable lens barrel 38 is such that the resultant force and the driving force of the elastic bodies 37a, 37b, 37c are balanced. Movement occurs.

  The characteristics of a suitable viscoelastic body used as the damping means 45a and 45b in the first embodiment will be described with reference to FIG.

  As shown in FIG. 8, the viscoelastic body generally changes its characteristics depending on the input frequency. As is well known, in a viscoelastic body, an increase in frequency exhibits the same physical properties as a decrease in temperature. That is, as shown in FIG. 8, with the transition region 51b interposed therebetween, rubber properties are exhibited in the low frequency region 51a (hereinafter referred to as rubber region), and glass properties are exhibited in the high frequency region 51c (hereinafter referred to as glass region). The rubber region is soft, and the glass region has a Young's modulus about 100 to 1000 times that of the rubber region. Generally, tan δ which is the ratio of the real part to the imaginary part in the complex elastic modulus is increased in the transition region 51b between the rubber region and the glass region. tan δ indicates the hysteresis of the stress-strain diagram of the viscoelastic body, and a larger value can convert kinetic energy into thermal energy more efficiently.

  Therefore, in the first embodiment, the control frequency band is set to about 0.3 Hz to 100 Hz in consideration of application to camera shake. A preferred method for setting the control frequency band will be described later. A material in which this control frequency band is included in the transition region 51b and tan δ is large is preferable. In recent years, many materials as described above have been developed, and various products such as gels and elastomers mainly composed of silicon are provided in addition to general butyl rubber. As an example, it can be said that a suitable viscoelastic material is, for example, inner and outer rubber-made honeynite, Miyasaka rubber-made Miya freak, three-bonded TB3168, or the like.

  Next, the design of the driving means will be described with reference to FIG.

  FIG. 9 is a diagram modeling movement in one axis direction of the driving unit of the correction optical system according to the first embodiment. FIG. 9A shows a model when there is no attenuation means, and FIG. 9B shows a model when the attenuation means is interposed.

  The shake correction unit 9 of the first embodiment has a plurality of elastic bodies, but when considering a specific moving direction, consider the resultant force of the plurality of elastic bodies as a virtual spring and dash pod. Can do. As shown in FIG. 9A, it can be expressed as a one-degree-of-freedom spring mass point system. The displacement x with respect to the force F at this time is expressed by the following formula (1).

  At this time, as described with reference to FIG. 6, the structure is configured to receive only a small amount of friction, so that the viscous resistance is generally small and the value of c is small. As a result, in FIG. 9 (a), the resonance is strongly observed. That is, it can be said that the mechanism can respond appropriately to an input with a small amplitude, but is easily affected by a disturbance. Here, the damping ratio ζ is defined by the following equation (2).

Using this damping ratio ζ, it is possible to grasp the resonance peak state and transient response of the spring mass system.

  FIG. 9B shows a system in which damping means 45a and 45b are interposed. Like the elastic bodies 37a, 37b and 37c, the resultant force of the damping body 45 is regarded as a virtual spring and a dash pod. It is a model figure. Reference numerals k1 and c1 denote springs and dash pods by elastic bodies, and k2 and c2 denote springs and dash pods by damping means 45a and 45b. The displacement x with respect to the force F in FIG. 9B is expressed by the following equation (3).

  When a suitable viscoelastic body as described in FIG. 8 is used as the damping means 45a and 45b, tan δ, which is the ratio of k2 and c2, shows a relatively large value in the control frequency band. Some suitable materials can be obtained on the order of 0.5. Since a large tan δ is obtained in this way, sufficient attenuation can be obtained even if k2 is a small value. That is, attenuation can be appropriately imparted without reducing the sensitivity of the actuator. The attenuation ratio at this time is clearly expressed by the following equation (4).

  Next, suitable control of the shake correction unit 9 shown in the first embodiment will be described with reference to FIG. FIG. 11 is a block diagram of a signal processing circuit that generates a control signal for the shake correction unit 9.

  In FIG. 11, 61 is an angular velocity sensor which is an example of the shake sensor 8, 62 is a low-pass filter (hereinafter referred to as LPF), 63 is a CPU, 64 is an A / D converter, and 65 is an integrator. 66 is a high-pass filter (hereinafter referred to as HPF), 67 is a memory in which various information such as zoom information of the imaging apparatus 1 is recorded, 68 is a correction optical system position converter for calculating the position of the correction optical system 12, and 69 is A correction optical system position controller, 70 is a driving means, and 9 is a shake correction unit.

  As shown in FIG. 11, an angular velocity sensor is often used as the shake sensor 8 for detecting shake such as hand shake. In the first embodiment as well, the following description will be given by taking the case where the angular velocity sensor 61 is used as an example.

  The angular velocity sensor 61 detects an angular velocity due to a shake such as a hand shake, and outputs a signal proportional to the angular velocity. The LPF 62 is provided for cutting noise and cuts high frequency noise of the angular velocity sensor 61. The CPU 63 performs computations necessary for shake correction, and includes an A / D converter 64, an integrator 65, an HPF 66, a memory 67, a correction optical system position converter 68, and a correction optical system controller 69. It has. The operation of each part will be described below.

  The A / D converter 64 digitally converts the signal that has passed through the LPF 62 at an appropriate sampling period. The sampling period is desirably about 100 times the control frequency band. For example, in the shake correction unit 9 that performs control up to 50 Hz, a sampling period of about 5000 Hz is preferable because the influence of sampling can be ignored. The integrator 65 integrates the angular velocity signal and obtains an angle due to camera shake. The HPF 66 is a filter that removes low-frequency fluctuations of the angular velocity sensor 61. The filter time constant is appropriately set in consideration of the low frequency fluctuation and the control frequency band.

  Further, the HPF 66 can acquire information on photographing conditions such as zoom information from the memory 67, and can appropriately change the time constant of the filter. The correction optical system position converter 68 calculates the amount of movement of the correction optical system 12 included in the shake correction unit 9 with respect to the input shake from information such as zoom and focus obtained from the memory 67. The correction optical system position controller 69 performs appropriate phase compensation in consideration of the frequency characteristics of the shake correction unit 9 and the like. Further, the correction optical system position controller 69 outputs the result to the drive means, and performs drive control of the shake correction unit 9.

  Here, the position of the correction optical system is detected by an arbitrary position sensor and can be moved to an arbitrary position by performing so-called feedback control.

  Next, assembly of the shake correction unit 9 in the first embodiment will be described. 12 to 15, the components other than an assembly table 47 and damper retainers 48 a and 48 b described later are the same as those shown in FIGS. 3 to 6.

  FIG. 12 is a perspective view of the shake correction unit 9 on the assembly table, and FIG. 13 is an exploded perspective view of the shake correction unit 9 viewed from the subject side. In these drawings, 47 is an assembly table, and 48a and 48b are damper pressers of the damper units 39a and 39b.

  FIG. 14 is a configuration diagram of the shake correction unit 9 when the damper units 39a and 39b are assembled. Specifically, FIG. 14A is a front view seen from the optical axis direction, FIG. 14B is a cross-sectional view taken along the line AA in FIG. 14A, and FIG. 14C is a cross-sectional view taken along the line B- in FIG. B sectional drawing and FIG.14 (d) are CC sectional drawing in Fig.14 (a).

  FIG. 15 is a detailed view of a damper unit 39a with a damper presser (regulating member) 48a. FIG. 15A is a top view thereof, and FIG. 15B is a side view thereof.

  The damper unit 39a is assembled as follows. First, the damper holding frame 44a (first mounting portion) is placed on the damper pressing member 48a. Here, the damper holding frame 44a is provided with a holding portion 44c for holding the damper presser 48a. That is, as shown in FIG. 15B, the inner diameter opening of the damper holding frame 44a attached to the base plate 31 serves as the holding portion 44c with respect to the damper pressing member 48a. Further, one end of a damper resistance rod (second attachment portion) 46a attached to the movable lens barrel 38 is fitted into the hole 48c of the damper presser 48a.

  Therefore, the damper holding frame 44a, which is the first mounting portion, and the damper resistance rod 46a, which is the second mounting portion, are fixed (restricted) by the damper presser 48a, and are incorporated into the movable lens barrel 38 and the base plate 31 that is the base plate. Sometimes it can be installed stably.

  Next, damping means 45a is provided around the damper resistance rod 46a in the damper holding frame 44a. That is, UV or thermosetting silicone gel is poured. Then, ultraviolet rays or heat is applied to cure the silicone gel.

  FIG. 16 is a flowchart showing an assembly procedure of the shake correction unit 9, and will be described with reference to FIGS.

  First, in step S101, the base plate 31 is placed on the assembly table 47 as shown in FIG. At this time, the two columns 47a and 47b (see FIG. 13) of the assembly table 47 are fitted and positioned in the holes 31c and 31d (see FIG. 13) of the base plate 31. In the next step S102, the coils 33a and 33b are placed on the base plate 31 and fixed by bonding or the like (see FIGS. 13 and 14C). The coils 33a and 33b are also fitted and positioned on the two columns 47a and 47b of the assembly table 47. In the next step S103, the balls 32a, 32b, and 32c are placed on the base plate 31 (see FIGS. 12 to 14B).

  In the next step S104, the movable lens barrel 38 is placed on the central portion of the assembly table 47 (see FIGS. 12 to 14). At this time, the movable lens barrel 38 is positioned on the assembly table 47, and the movable lens barrel 38 has a height that does not contact the balls 32a, 32b, and 32c. Therefore, a load is applied to the balls 32a, 32b, and 32c during the assembly, and the base plate 31 is not damaged such as a dent. Here, the correction optical system 12 is fixed to the movable barrel 38 in advance by heat caulking, bonding, or the like. In the next step S105, the damper units 39a and 39b with the damper pressing members 48a and 48b are fixed to the holes 31a and 31b of the base plate 31 by bonding or the like through the holes 47c and 47d (see FIG. 13) of the assembly base 47. (See FIG. 14D and FIG. 15).

  In the next step S106, the damper resistance rods 46a and 46b are inserted into the holes 38a and 38b (see FIG. 13) of the movable lens barrel 38 and fixed by bonding or the like (see FIG. 14 (d)). In the next step S107, the damper pressers 48a and 48b are removed (see FIG. 14 (d) → FIG. 5 (d)). In the next step S108, the elastic bodies 37a and 37b are hung on the base plate 31 and the movable lens barrel 38 (see FIGS. 12 to 14).

  In the next step S109, the magnets 34a and 34b and the yoke 35 are fixed to the movable barrel 38 with screws 36a and 36b (see FIGS. 13 and 14C). At this time, the columns 47a and 47b of the assembly table 47 receive the magnets 34a and 34b. In the next step S110, the coils 33a and 33b are wired (not shown) to check the operation. In step S111, the shake correction unit 9 assembled from the assembly table 47 is removed (see FIG. 14D and FIG. 5D).

  Here, the correction optical system 12 may be directly incorporated without being fixed to the movable barrel 38 in advance. Further, the magnets 34a and 34b and the yoke 35 may be previously incorporated in the movable lens barrel 38 and placed. Further, the assembly flow shown in FIG. 16 is an example of the present invention, and may be assembled in a different order.

  According to the first embodiment, the shake correction unit 9 is attached to the damper holding frames (first attachment portions) 44a and 44b attached to the base plate 31 that is a fixed member, and the movable lens barrel 38 that is a movable member. Damper resistance rods (second mounting portions) 46a and 46b. Further, damper units (damper means) 39a and 39b are formed by unitizing damping means 45a and 45b for viscoelastically supporting between the damper holding frames 44a and 44b and the damper resistance rods 46a and 46b. The damper units 39a and 39b perform braking in the moving direction of the correction optical system 12.

  By unitizing the damper units 39a and 39b as the damper means as described above, it is possible to improve the mass production stability and the assembly stability and to reduce the cost. Further, by providing the damper units 39a and 39b having a simple configuration, it is possible to obtain viscous resistance suitable for image blur correction.

  Further, a plurality of balls 32 a, 32 b, 32 c sandwiched between the movable lens barrel 38 and the base plate 31, and a plurality of elastic bodies 37 a, 37 b, 37 c that urge the movable lens barrel 38 toward the base plate 31 are provided. ing. Therefore, the movable lens barrel 38 can be moved with respect to the base plate 31 by a small friction called rolling friction, and shake correction can be performed appropriately.

  In addition, since the plurality of elastic bodies 37a, 37b, and 37c attached between the movable barrel 38 and the base plate 31 are provided, the movable center of the correction optical system 12 can always be positioned at the center of the optical axis 4. In addition, an expensive position detection device can be dispensed with.

  In addition, since the driving means is arranged on substantially the same plane perpendicular to the optical axis 4, the apparatus can be thinned.

  A plurality of attenuating means 45 a and 45 b are provided in line symmetry or point symmetry with respect to the optical axis 4. Therefore, when the movable lens barrel 38 moves relative to the base plate 31, no moment is generated in the movable lens barrel 38 due to the force received from the damper units 39a and 39b. The attenuating means 45a and 45b are made of gel, elastomer, butyl rubber, or the like whose main component is silicon.

  Further, since the drive means is controlled to be open, the control system can be made simple.

  A shake correction unit according to the second embodiment of the present invention will be described with reference to FIGS.

  Hereinafter, the shake correction unit 190 according to the second embodiment will be described in detail with reference to FIGS. The difference from the shake correction unit 9 of the first embodiment is that the configuration of the damper units 139a and 139b and the driving means use a so-called moving coil type.

  Since the imaging apparatus in which the shake correction unit 190 of the second embodiment is incorporated and the electrical configuration thereof are the same as those of the first embodiment, the description thereof is omitted here.

  17 is a perspective view of the shake correction unit 190, and FIG. 18 is an exploded perspective view of the shake correction unit 190 as viewed from the subject side.

  19 and 20, 131 is a base plate (fixed member), 138 is a movable lens barrel (movable member), and 132a, 132b, and 132c are spheres held between the base plate 131 and the movable lens barrel 138. Reference numeral 120 denotes a correction optical system that is fixed to the movable lens barrel 138 and corrects image blur during photographing. 133a and 133b are coils, 134a and 134b are magnets, 135a and 135b are yokes, and 137a, 137b, and 137c are elastic bodies.

  Note that FIGS. 17 to 21 show only the main part of the shake correction unit 190, and do not show the holding members, lead wires, and the like.

  Next, the relative movement between the base plate 131 and the movable lens barrel 138 will be described with reference to FIGS.

  The correction optical system 120 is fixed to a movable barrel 138 that can move in the X and Y directions with respect to the base plate 131. The base plate 131 and the movable lens barrel 138 sandwich the balls 132a, 132b, and 132c, and perform relative motion via the balls 132a, 132b, and 132c. For this reason, relative motion can be performed only under the influence of very small friction called rolling friction. Since the friction is small, it can respond appropriately even to a very small input. In addition, by manufacturing the guide surfaces by the balls 132a, 132b, and 132c with appropriate accuracy, even when the base plate 131 and the movable lens barrel 138 perform relative movement, the tilt of the movable lens barrel 138 and the direction of the optical axis can be improved. Unnecessary movement does not occur.

  FIG. 19 is a plan view of the shake correction unit 190. 19A is a front view seen from the optical axis direction, FIG. 19B is a cross-sectional view taken along the line AA in FIG. 19A, and FIG. 19C is a cross-sectional view taken along the line BB in FIG. FIG. 19 (d) is a cross-sectional view taken along the line CC in FIG. 19 (a).

  As shown in FIG. 19A, the movable member is supported by the same method as in the first embodiment. In other words, the movable barrel (movable member) 138 is elastically supported by the plurality of elastic bodies 137a, 137b, and 137c with respect to the base plate (fixed member) 131. In the second embodiment, three elastic bodies 137a, 137b, and 137c are arranged radially from the optical axis 104 at intervals of 120 degrees. By adopting such a symmetrical arrangement, it is possible to suppress excitation of unnecessary resonance due to generation of moment. Further, it is possible to prevent the correction optical system 120 from drooping when the power is turned off, so that an expensive lock mechanism or the like is not necessary, and the cost can be reduced. Further, by being elastically supported by the plurality of elastic bodies 137a, 137b, and 137c, the movable center of the correction optical system 120 can always be positioned at the optical axis center. Therefore, feedback control using an expensive position detection device for the correction optical system 120 is not required, and the cost can be reduced.

  As shown in FIG. 19B, the elastic bodies 137a, 137b, and 137c are attached with appropriate inclination in the optical axis direction, and balls 132a, 132b, and 132b provided between the base plate 131 and the movable lens barrel 138, respectively. 132c is held.

  As shown in FIG. 19C and the like, the coil 133a (133b) is fixed to the movable barrel 138, and the magnet 134a (134b, 134c) and the yoke 135a (135b) are fixed to the base plate 131. ing. This constitutes a so-called moving coil type actuator (driving means).

  In FIG. 19A, the first electromagnetic actuator is disposed on the upper right side of the movable barrel 138 in the drawing. The first electromagnetic actuator includes a first coil 133a attached to the movable lens barrel 138, a magnet 134a and a yoke 135a attached to the base plate 131. Further, a second electromagnetic actuator is disposed on the upper left side of the movable lens barrel 138 in the drawing. The second electromagnetic actuator includes a second coil 133b attached to the movable lens barrel 138, a magnet 134b attached to the base plate 131, and a yoke 135b.

  Next, attachment of the damper units 139a and 139b which are damper means will be described.

  In FIG. 19D and the like, 144a and 144b are damper holding frames of the damper units 139a and 139b, 145a and 145b are damping means, and 146a and 146b are damper inner frames. The damper units 139a and 139b are attached to the cylindrical holes 138a and 138b (FIG. 18) provided in the movable barrel 138 by bonding or the like. Further, cylindrical shafts 131a and 131b (see FIG. 18) provided on the base plate 131 are press-fitted into the damper inner frames 146a and 146b of the damper units 139a and 139b.

  It is desirable to provide a plurality of damper units 139a and 139b symmetrical to the optical axis. In the second embodiment, as shown in FIG. 19D, two are provided at positions symmetrical to the optical axis 104. By providing symmetrically with respect to the optical axis 104, when the base plate 131 and the movable lens barrel 138 move relative to each other, a moment is generated in the movable lens barrel 138 by the force received from the damper units 139a and 139b as the damper means. There is no.

  FIG. 20 is a detailed view of the damper unit 139a. FIG. 20A is a side view thereof, and FIG. 20B is a bottom view thereof. The damper unit 139b is the same.

  The damper inner frame 146a is disposed so as to be substantially concentric with respect to the damper holding frame 144a, and a damping means 145a is provided in a donut shape in the gap. Although various viscoelastic bodies can be used for the attenuating means 145a, in the second embodiment, ultraviolet rays or thermosetting silicone gel excellent in assembling property and environmental resistance are used.

  Here, in the second embodiment, the damper units 139a and 139b are attached to the cylindrical holes 138a and 138b provided on the movable lens barrel 138, and the cylindrical shafts 131a and 131b provided on the base plate 131 are attached. It is press-fitted into the damper inner frame 146a. However, a cylindrical hole may be provided on the base plate 131, a damper unit may be attached thereto, and a cylindrical shaft provided on the movable barrel 138 may be press-fitted into the damper inner frame.

  Next, with reference to FIG. 21, a driving unit including the above-described coil 133a (133b), magnet 134a (134b), and yoke 135a (135b) of the shake correction unit 190 will be described.

  FIG. 21 is a schematic diagram of the driving means. FIG. 21A is a view of only the magnet 134a (134b) and the coil 133a (133b) seen from the optical axis direction, and FIG. 21B is a view of the magnet 134a (134b). It is sectional drawing when cut | disconnecting center vicinity.

  In FIGS. 21A and 21B, reference numeral 143 denotes a magnetization boundary. In FIG. 21B, 142a, 142b, and 142c schematically represent typical magnetic lines of force near the magnet 134a (134b) and the coil 133a (133b).

  As shown in FIG. 21, the magnet 134a is magnetized in two regions 134a1 and 134a2 across the magnetization boundary 143. At this time, the magnetization boundary 143 is a direction orthogonal to the direction of the force generated by the driving means, and there is a magnetization boundary in the vertical direction in FIG. The coil 133a has an oval shape when viewed from the optical axis direction, and is arranged so that the two longitudinal portions 133a1 and 133a2 face the two magnets 134a1 and 134a2.

  As shown in FIG. 21B, a fixed yoke 135a is provided on the surface of the magnet 134a opposite to the coil 133a. The fixed yoke 135a is preferably a soft magnetic material, and transmits a large amount of magnetic flux as shown in FIG. 21 (b) to lower the permeance of the magnetic circuit. As a result, magnetic lines of force are generated relatively linearly between the magnet 134a and the coil 133a as in 142a and 142b.

  Since the fixed yokes 135a and 135b are fixed to the base plate 131, the thickness can be made appropriate so that the magnetic flux is not saturated without worrying about the weight. When the coil 133a is energized in this state, a current flows in the opposite direction to 133a1 and 133a2 in the direction perpendicular to the paper surface of FIG. Thereby, a driving force is generated according to the Fleming left-hand rule. Since the movable lens barrel 138 is elastically supported as described with reference to FIG. 21A, the movable lens barrel 138 is relatively positioned between the base plate 131 and the movable lens barrel 138 until the resultant force and the driving force of the elastic bodies 137a, 137b, and 137c are balanced. Movement occurs.

  Here, the viscoelastic body as the damping means 145a and 145b suitable for the second embodiment is the same as that of the first embodiment. Further, the control method of the shake correction unit 190 shown in the second embodiment is also the same as that in the first embodiment, and is omitted. Further, the position can be moved to an arbitrary position by detecting the position with an arbitrary correction optical system position sensor and performing so-called feedback control.

  Next, assembly of the shake correction unit 190 in the second embodiment will be described. 22 to 24, the components other than an assembly table 147 and damper retainers 148a and 148b described later are the same as those shown in FIGS.

  FIG. 22 is a perspective view of the shake correction unit 190 on the assembly table, and FIG. 23 is an exploded perspective view of the shake correction unit 190 viewed from the subject side. 22 and 23, in these drawings, reference numeral 147 denotes an assembly table, and reference numerals 148a and 148b denote damper pressing members of the damper units 139a and 139b.

  FIG. 24 is a configuration diagram of the shake correction unit 190. Specifically, FIG. 24A is a front view seen from the optical axis direction, FIG. 24B is a cross-sectional view taken along line AA in FIG. 24A, and FIG. 24C is B- in FIG. B sectional view and Drawing 24 (d) are CC sectional views in Drawing 24 (a).

  FIG. 25 is a detailed view of a damper unit 139a with a damper presser (regulating member) 148a. Specifically, FIG. 25A is a side view thereof, and FIG. 25B is a bottom view thereof.

  The damper retainer 148a is placed on the damper holding frame (second mounting portion) 144a of the damper unit 139a. Here, the damper unit 139a is provided with a holding portion for holding the damper presser 148a. Specifically, in FIG. 25A, the damper presser 148a is held by the damper unit 139a with the inner diameter opening of a damper holding frame (second mounting portion) 144a attached to the movable lens barrel 138 as a holding portion 144c. . The hole 148c of the damper presser 148a is fitted to the outer peripheral portion 146a1 of the damper inner frame (first mounting portion) 146a attached to the columnar shaft 131a (see FIG. 18) provided in the base plate 131. ing.

  Therefore, the damper holding frame 144a, which is the second mounting portion, and the damper inner frame 146a, which is the first mounting portion, are fixed (restricted) by the damper presser 148a and are stable when incorporated in the movable lens barrel 138 and the base plate 131. Can be incorporated.

  Next, damping means 145a and 145b are provided between the damper holding frames 144a and 144b and the damper inner frames 146a and 146b. That is, UV or thermosetting silicone gel is poured. Next, ultraviolet rays or heat is applied to cure the silicone gel.

  Since the assembly flowchart is almost the same as that of the first embodiment, it is omitted here.

  According to the second embodiment, the shake correction unit 190 includes the damper inner frames (first attachment portions) 146a and 146b attached to the base plate 131 that is a fixing member. Furthermore, it has damper holding frames (second mounting portions) 144a and 144b attached to the movable lens barrel 138 which is a movable member. Further, damper units (damper means) 139a and 139b are formed by unitizing damping means 145a and 145b that viscoelastically support between the damper holding frames 144a and 144b and the damper inner frames 146a and 146b. The damper units 139a and 139b perform braking in the moving direction of the correction optical system 120.

  By unitizing the damper units 139a and 139b as the damper means as described above, it is possible to improve the mass production stability and the assembly stability and to reduce the cost. Further, by providing the damper units 139a and 139b having a simple configuration, it is possible to obtain a viscous resistance suitable for image blur correction.

  Other effects are the same as those of the first embodiment.

  26 to 29 show an imaging apparatus according to Embodiment 3 of the present invention and a shake correction unit 290 provided in the imaging apparatus. The difference between the shake correction unit 9 in the first embodiment and the shake correction unit 290 in the third embodiment uses an image sensor 206 instead of the correction optical system 12 as a correction means. Then, the image pickup device 206 is moved in a plane orthogonal to the optical axis by the driving means to perform image shake.

  FIG. 26 is a diagram illustrating an imaging apparatus in which the shake correction unit 290 is incorporated.

  In FIG. 26, 201 is an imaging device, 202 is an imaging lens, 203 is a lens driving unit, 204 is an optical axis of the imaging lens 202, 205 is a lens barrel, and 206 is an imaging element. Reference numeral 207 denotes a memory, 208 denotes a shake sensor used as shake detection means, 209 denotes an image sensor driving unit, 210 denotes a power source, 211 denotes a release button, 213 denotes a so-called quick return mirror, and 214 denotes a finder optical system. Reference numeral 290 denotes a shake correction unit (image sensor unit), which includes an image sensor 206.

  FIG. 27 is a block diagram illustrating an electrical configuration of the imaging apparatus 201. The imaging apparatus 201 has an imaging system, an image processing system, a recording / reproducing system, and a control system. The imaging system includes an imaging lens 202 and an imaging element 206, and the image processing system includes an A / D converter 220 and an image processing unit 221. The recording / reproducing system includes a recording processing unit 223 and a memory 224. The control system includes a camera system control unit 225, an AF sensor 226, an AE sensor 227, a shake sensor 208, an operation detection unit 229, an image sensor control unit 212, and a lens system control unit 230.

  Since the imaging apparatus 201 and its electrical configuration according to the third embodiment are substantially the same as those of the first embodiment, detailed description thereof is omitted here. The main part of the shake correction unit 290 according to the third embodiment will be described later.

  FIG. 28 is a configuration diagram of the shake correction unit 290. Specifically, FIG. 28A is a front view seen from the optical axis direction, FIG. 28B is an AA plane view in FIG. 28A, and FIG. 28C is B- in FIG. B sectional drawing and FIG.28 (d) are CC sectional drawing in Fig.28 (a).

  As shown in FIG. 28A, the movable member is supported by the same method as in the first embodiment. That is, the movable frame (movable member) 238 is elastically supported by the plurality of elastic bodies 237a, 237b, and 237c with respect to the base plate (fixed member) 231. In the third embodiment, three elastic bodies 237a, 237b, and 237c are arranged radially from the optical axis 204 at intervals of 120 degrees. By adopting such a symmetrical arrangement, it is possible to suppress excitation of unnecessary resonance due to generation of moment. Furthermore, it is possible to prevent the shake correction unit 290 from drooping when the power is turned off, which eliminates the need for an expensive lock mechanism and the like, thereby reducing costs.

  Further, by being elastically supported by the plurality of elastic bodies 237a, 237b, and 237c, the movable center of the shake correction unit 290 can always be positioned at the center of the optical axis, and the position detection device for the expensive shake correction unit 290 is provided. Feedback control using is no longer necessary. Thus, cost reduction can be achieved.

  As shown in FIG. 28 (b), the elastic body 237a (237b, 237c) is attached with an appropriate inclination in the optical axis direction, and a sphere 232a (232b, 232b, 232) provided between the base plate 231 and the movable frame 238 is attached. 232c).

  As shown in FIG. 28C, the coil 233a (233b) is fixed to the base plate 231, and the magnet 234a (234b) and the yoke 235 are fixed to the movable frame 238. Thus, a so-called moving magnet type actuator (driving means) is constituted.

  In FIG. 28A, a first electromagnetic actuator is disposed on the upper right side of the movable frame 238 in the drawing. The first electromagnetic actuator includes a coil 233 a attached to the base plate 231, a magnet 234 a attached to the movable frame 238, and a yoke 235. Further, a second electromagnetic actuator is arranged on the upper left side of the movable frame 238 in the drawing. The second electromagnetic actuator includes a coil 233b attached to the base plate 231 and a magnet 234b and a yoke 235 attached to the movable frame 238.

  Next, attachment of the damper units 239a and 239b as damper means will be described.

  In FIG. 28 (d), 244a and 244b are damper holding frames (first mounting portions) of the damper units 239a and 239b, 245a and 245b are damping means, and 246a and 246b are damper resistance rods (second mounting portions). is there.

  The damper units 239a and 239b are attached to columnar holes 231a and 231b (see FIG. 29 described later) provided in the base plate 231 by adhesion or the like. The damper resistance rods 246a and 246b are inserted into columnar holes 238a and 238b (see FIG. 29 described later) provided in the movable frame 238, and are fixed by bonding or the like. It is desirable that a plurality of damper units 239a and 239b be provided symmetrically with respect to the optical axis. In the third embodiment, as shown in FIG. 28D, two are provided at symmetrical positions with respect to the optical axis 204. By providing symmetrically with respect to the optical axis 204, when the base plate 231 and the movable frame 238 perform relative motion, no moment is generated in the movable frame 238 due to the force received from the damper units 239a and 239b as the damper means. .

  Detailed views of the damper units 239a and 239b are the same as those in the first embodiment, and will be omitted. Further, the driving means of the shake correction unit 290 is the same as that of the first embodiment, and thus the description thereof is omitted.

  Further, damping means 245a and 245b (viscoelastic bodies) suitable for the third embodiment are the same as those of the first embodiment. Further, the control method of the shake correction unit 290 shown in the third embodiment is also the same as that in the first embodiment, and is omitted.

  Further, it is possible to move to an arbitrary position by performing position detection by an arbitrary image sensor position sensor and performing so-called feedback control.

  FIG. 29 is an exploded perspective view of the shake correction unit 290 on the assembly table as viewed from the subject side. The main part of the shake correction unit 290 according to the third embodiment will be described with reference to FIG.

  Reference numeral 231 denotes a base plate (fixed member), reference numeral 238 denotes a movable frame (movable member), and reference numerals 232a, 232b, and 232c denote balls held between the base plate 231 and the movable frame 238. Reference numeral 290 denotes a shake correction unit in which the image sensor 206 is soldered to a flexible substrate (FPC). 233a and 233b are coils, 234a and 234b are magnets, 235 is a yoke (magnet adsorption plate), and 236a and 236b are adsorption plate fixing screws. Reference numerals 237a, 237b, and 237c denote elastic bodies, and 239a and 239b denote damper units. Reference numeral 247 denotes an assembly table, and 248a and 248b are damper pressing members of the damper units 239a and 239b.

  In FIG. 29, only the main part of the shake correction unit 290 is shown, and the holding member, the lead wire, and the like are not shown.

  Here, when the shake correction unit 290 of the third embodiment is incorporated in the imaging apparatus 201 as shown in FIG. 26, the damper pressing tool 247 is removed and incorporated.

  The relative movement between the base plate 231 and the movable frame 238 will be described with reference to FIG. The image sensor 206 is fixed to a movable frame 238 that can move in the X direction and the Y direction with respect to the base plate 231. The movable frame 236 is provided with projections (not shown), and the base plate 231 is provided with projections 231c and 231d, which are fitted in the guide holes 249a, 249b, 249c and 249d of the rotation restricting plate 249, respectively. Can be attached. Thus, it is configured to be slidable in the X direction and the Y direction without rotating around the optical axis.

  As described above, the base plate 231 and the movable frame 238 sandwich the balls 232a, 232b, and 232c, and perform relative motion via the balls 232a, 232b, and 232c. For this reason, relative motion can be performed only under the influence of very small friction called rolling friction. Since the friction is small, it can respond appropriately even to a very small input. Further, by manufacturing the guide surfaces by the balls 232a, 232b, and 232c with appropriate accuracy, even when the base plate 231 and the movable frame 238 perform relative motion, the movable frame 238 is tilted and unnecessary in the optical axis direction. There is no movement.

  Detailed views of the damper units 239a and 239b with the damper pressing members 248a and 248b are the same as those in the first embodiment, and therefore will be omitted.

  Also, the assembly flowchart is almost the same as that of the first embodiment, and is omitted here.

  According to the third embodiment, the shake correction unit 290 includes the damper holding frames (first attachment portions) 244a and 244b attached to the base plate 231 that is a fixing member. Furthermore, it has damper resistance rods (second attachment portions) 246a and 246b attached to the movable frame 238 which is a movable member. Furthermore, damper units (damper means) 239a and 239b are formed by unitizing damping means 245a and 245b that viscoelastically support between the damper holding frames 244a and 244b and the damper resistance rods 246a and 246b. The damper units 239a and 239b perform braking in the moving direction of the image sensor 206 serving as correction means.

  By unitizing the damper units 239a and 239b as the damper means as described above, the mass production stability and the assembly stability can be improved, and the cost can be reduced. In addition, by providing the damper units 239a and 239b having a simple configuration, it is possible to obtain viscous resistance suitable for image blur correction.

  Other effects are the same as those of the first embodiment.

(Correspondence between the present invention and the embodiment)
In the first embodiment, the correction optical system 12 corresponds to a correction unit of the present invention, the movable lens barrel 38 corresponds to a movable member that integrally holds the correction unit, and the base plate 31 corresponds to a fixed member. The cylindrical damper holding frames 44a and 44b and the rod-shaped damper resistance rods 46a and 46b correspond to one or the other of the first mounting portion and the second mounting portion of the present invention. Further, the damping means 45a and 45b correspond to the damping means, and the damper units 39a and 39b correspond to the damper means, respectively.

  In the second embodiment, the correction optical system 120 corresponds to a correction unit of the present invention, the movable lens barrel 138 corresponds to a movable member that integrally holds the correction unit, and the base plate 131 corresponds to a fixed member. The cylindrical circular damper inner frames 146a and 146b and the damper holding frames 146a and 146b arranged concentrically on the outer sides thereof correspond to one or the other of the first mounting portion and the second mounting portion of the present invention. To do. Further, the damping means 145a and 145b, which are provided between the first mounting part and the second mounting part and are configured by a viscoelastic body capable of supporting them, are used as the damping means, and the damper units 139a and 139b are used as the damper means. , Respectively.

  In the third embodiment, the image sensor 206 corresponds to a correction unit of the present invention, the movable frame 238 corresponds to a movable member that integrally holds the correction unit, and the base plate 231 corresponds to a fixed member. The cylindrical damper holding frames 244a and 244b and the rod-shaped damper resistance bars 246a and 246b correspond to one or the other of the first mounting portion and the second mounting portion of the present invention. Further, the damping means 245a and 245b correspond to the damping means, and the damper units 239a and 239b correspond to the damper means, respectively.

1 is an optical layout diagram illustrating an imaging apparatus according to Embodiment 1 of the present invention. 1 is a block diagram illustrating an electrical configuration of an imaging apparatus according to Embodiment 1 of the present invention. It is a perspective view which shows the shake correction unit which concerns on Example 1 of this invention. It is a disassembled perspective view which shows the shake correction unit which concerns on Example 1 of this invention. It is a block diagram which shows the detail of the shake correction unit which concerns on Example 1 of this invention. It is a block diagram which shows the damper unit which concerns on Example 1 of this invention. It is a block diagram which shows the drive means which concerns on Example 1 of this invention. It is a figure for demonstrating the frequency characteristic of the viscoelastic body in Example 1 of this invention. It is a figure which shows the analysis model of the shake correction unit which concerns on Example 1 of this invention. It is a frequency response diagram in the presence or absence of an attenuation means in Example 1 of this invention. It is a block diagram which shows the control system of the shake correction unit which concerns on Example 1 of this invention. It is a perspective view at the time of the assembly of the shake correction unit which concerns on Example 1 of this invention. It is a disassembled perspective view at the time of the assembly of the shake correction unit which concerns on Example 1 of this invention. It is a block diagram at the time of the assembly of the shake correction unit which concerns on Example 1 of this invention. It is a block diagram which shows the time of the damper unit incorporation which concerns on Example 1 of this invention. It is a flowchart which shows the assembly procedure of the shake correction unit which concerns on Example 1 of this invention. It is a perspective view which shows the shake correction unit which concerns on Example 2 of this invention. It is a disassembled perspective view which shows the shake correction unit which concerns on Example 2 of this invention. It is a block diagram which shows the shake correction unit which concerns on Example 2 of this invention. It is a block diagram which shows the damper unit which concerns on Example 2 of this invention. It is a block diagram which shows the drive means which concerns on Example 2 of this invention. It is a perspective view which shows the shake correction unit mounted on the assembly stand in Example 2 of this invention. It is a disassembled perspective view at the time of the assembly of the shake correction unit which concerns on Example 2 of this invention. It is a block diagram at the time of the assembly of the shake correction unit which concerns on Example 2 of this invention. It is a block diagram which shows the time of the damper unit incorporation which concerns on Example 2 of this invention. It is an optical arrangement | positioning figure which shows the imaging device which concerns on Example 3 of this invention. It is a block diagram which shows the electric constitution of the imaging device which concerns on Example 3 of this invention. It is a block diagram which shows the shake correction unit which concerns on Example 3 of this invention. It is a disassembled perspective view which shows the shake correction unit which concerns on Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Imaging lens 6 Imaging element 8 Shake sensor 9 Shake correction unit 12 Correction optical system 31 Base plate 32a, 32b, 32c Sphere 33a, 33b Coil 34a, 34b Magnet 35 Yoke 37a, 37b, 37c Elastic body 38 Movable lens barrel 39a, 39b Damper unit 44a, 44b Damper holding frame 45a, 45b Damping means 46a, 46b Damper resistance rod 47 Assembly table 48a, 48b Damper presser 120 Correction optical system 131 Base plate 132a, 132b, 132c Ball 133a, 133b Coil 134a, 134b Magnet 135 Yoke 137a, 137b, 137c Elastic body 138 Movable lens barrel 139a, 139b Damper unit 144a, 144b Damper holding frame 145a, 145b Damping means 146a, 146b Dunn Par inner frame 147 Assembly table 190 Shake correction unit 201 Imaging device 206 Imaging device 231 Base plate 232a, 232b, 232c Sphere 233a, 233b Coil 234a, 234b Magnet 235 Yoke 237a, 237b, 237c Elastic body 238 Movable frame 239a, 239b Damper unit 244a, 244b Damper holding frame 245a, 245b Damping means 246a, 246b Damper resistance rod 247 Assembly table 290 Vibration correction unit

Claims (8)

Correction means for correcting image blur;
A movable member that integrally supports the correction means;
A fixed member that holds the movable member movably,
In a shake correction apparatus that corrects image shake due to shake by moving the correction means in a plane orthogonal to the optical axis of the imaging optical system via the movable member,
A first attachment portion attached to the fixed member; a second attachment portion attached to the movable member; and a damping means for supporting viscoelasticity between the first attachment portion and the second attachment portion. Is a unit, and has a damper means for braking in the moving direction of the correction means.   One of the first mounting portion and the second mounting portion is constituted by a cylindrical damper holding frame, and the other is constituted by a rod-like damper resistance rod arranged at the center of the damper holding frame. The shake correction apparatus according to claim 1.   One of the first mounting portion and the second mounting portion is configured by a cylindrical damper inner frame, and the other is configured by a damper holding frame disposed concentrically on the outside of the damper inner frame. The shake correction apparatus according to claim 1.   4. The shake correction apparatus according to claim 1, wherein the attenuation means is a silicone gel.   The shake correction apparatus according to claim 4, wherein the silicone gel is a gel that is cured by ultraviolet rays or heat.   6. The shake correction apparatus according to claim 1, wherein the correction unit is a correction optical system.   The shake correction apparatus according to claim 1, wherein the correction unit is an image sensor that is movable to correct image shake.   An image pickup apparatus comprising the shake correction apparatus according to claim 1.

Images