JP3720474B2 - Vibration correction device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a shake correction apparatus disposed in a camera or the like that corrects image shake caused by shake applied to an optical apparatus in which the apparatus is mounted.
[0002]
[Prior art]
Since the current camera automates all the important tasks for shooting such as determining the exposure and focusing, the possibility of shooting failure even for those who are unskilled in camera operation is very low.
[0003]
Recently, a system for preventing camera shake applied to the camera has been studied, and the cause of the photographer's shooting failure has almost disappeared.
[0004]
Here, a system for preventing camera shake will be briefly described.
[0005]
The camera shake at the time of shooting is usually a vibration of 1 Hz to 12 Hz as a frequency, but it is fundamental to enable taking a photograph without image shake even if such a shake occurs at the shutter release time. As an idea, it is necessary to detect the vibration of the camera due to the camera shake and displace the correction lens according to the detected value. Accordingly, in order to achieve the ability to take a photograph that does not cause image shake even if camera shake occurs, firstly, it is necessary to accurately detect camera vibration and secondly to correct optical axis changes due to camera shake. Necessary.
[0006]
In principle, this vibration (camera shake) is detected by means of vibration detection means for detecting angular acceleration, angular velocity, angular displacement, and the like, and the angular displacement obtained by integrating the sensor output signal electrically or mechanically. Can be performed by mounting the camera shake detection means for outputting Then, by driving a correction optical device that decenters the photographing optical axis based on this detection information, image blur can be suppressed.
[0007]
Here, the outline of the image stabilization system using the vibration detection means will be described with reference to FIG.
[0008]
The example of FIG. 27 is a diagram of a system that suppresses image blur caused by the camera vertical shake 81p and the horizontal shake 81y in the direction of the arrow 81 illustrated.
[0009]
In the figure, 82 is a lens barrel, 83p and 83y are vibration detection means for detecting camera longitudinal vibration and camera lateral vibration, respectively, and the vibration detection directions are indicated by 84p and 84y, respectively. 85 is a correction optical device (86p and 86y are coils for applying thrust to the correction optical device 85, respectively. 87p, 87y Is a position detection element for detecting the position of the correction means 85, and the correction optical device 85 is provided with a position control loop which will be described later, and is driven with the outputs of the vibration detection means 83p and 83y as target values. Ensure stability at 88.
[0010]
FIG. 28 is an exploded perspective view showing the structure of a shake correction apparatus (which will be described later in detail, comprising correction means and means for supporting and locking the correction means) that is preferably used for such purposes. Hereinafter, this structure will be described with reference to FIGS.
[0011]
The rear protruding ears 71a (three places (one place is hidden and cannot be seen)) of the base plate 71 (enlarged view in FIG. 31) are fitted into a lens barrel (not shown), and a known lens barrel or the like is screwed into the hole 71b. It is stopped and fixed to the lens barrel.
[0012]
The second yoke 72, which is a magnetic body and is subjected to light selective plating, is screwed to the hole 71c of the base plate 71 with a screw that penetrates the hole 72a. A permanent magnet (shifting magnet) 73 such as a neodymium magnet is magnetically attracted to the second yoke 72. The magnetization direction of each permanent magnet 73 is the direction of the arrow 73a shown in FIG.
[0013]
Coils 76p and 76y (shift coils) are forcibly pushed into the support frame 75 (enlarged view in FIG. 32) to which the correction lens 74 is fixed by a C-ring or the like (hereinafter referred to as “Patchon bonding”). (FIG. 32 is not bonded), and light projecting elements 77p and 77y such as IRED are also bonded to the back surface of the support frame 75, and the emitted light passes through slits 75ap and 75ay, and the position detecting element such as PSD described later. Incident to 78p, 78y.
[0014]
In the holes 75b (three places) of the support frame 75, spherical support balls 79a, 79b such as POM (polyacetal resin) and a charge spring 710 are inserted (FIGS. 29 and 29). 30 The support ball 79a is caulked and fixed to the support frame 75 (refer to the support ball 79b, which can slide in the extending direction of the hole 75b against the spring force of the charge spring 710).
[0015]
FIG. 29 is a cross-sectional view after assembling the shake correcting device. The support ball 79b, the charged charge spring 710, and the support ball 79a are inserted into the hole 75b of the support frame 75 in the direction of the arrow 79c in this order (support ball). 79a and 79b are parts of the same shape), and finally the peripheral end portion 75c of the hole 75b is caulked to prevent the support ball 79a from coming off.
[0016]
Illustration of hole 75b 29 cross sections FIG. 30A shows a cross-sectional view in the direction orthogonal to FIG. 30A, and FIG. 30B shows a plan view of the cross-sectional view of FIG. 30A viewed from the direction of the arrow 79c. of Sign The depth of the range shown to AD is shown to AD of Fig.30 (a).
[0017]
Here, since the rear end portion of the blade portion 79aa of the support ball 79a is received and regulated within the range of the depth A surface, the support ball 79a is fixed to the support frame 75 by caulking the peripheral end portion 75a. .
[0018]
Since the tip of the blade portion 79ba of the support ball 79b is received within the range of the depth B surface, the support ball 79b is not pulled out from the hole 75b in the direction of the arrow 79c by the charge spring force of the charge spring 710. .
[0019]
Of course, when the assembly of the shake correction device is completed, the support ball 79b is shown in FIG. 29 As shown in FIG. 4, since the second yoke 72 is received, it will not come out of the support frame 75, but the retaining range B surface is provided in consideration of assembly.
[0020]
The shape of the hole 75b of the support frame 75 shown in FIGS. 29 and 30 is a simple 2 in which a complicated inner diameter slide mold is not required even when the support frame 75 is formed by molding, and the mold is pulled out on the opposite side to the arrow 79c. Since it can be molded with a split mold, the dimensional accuracy can be set strictly.
[0021]
In this manner, since the support balls 79a and 79b are the same part, not only the part cost is reduced, but there is no assembly error, which is advantageous in parts management.
[0022]
For example, a fluorine-based grease is applied to the bearing portion 75d of the support frame 75, and an L-shaped shaft 711 (nonmagnetic stainless steel) is inserted therein (see FIG. 28). The other end of the L-shaped shaft 711 is The support frame 75 is housed in the base plate 71 by inserting the support balls 79 b at the three locations on the second yoke 72 together with the bearing portion 71 d (also coated with grease) formed on the base plate 71.
[0023]
Next, the positioning holes 712a (three places) of the first yoke 712 shown in FIG. 31 Are received by the first yoke 712 at the receiving surface 71e (five locations) shown in FIG. 31 and magnetically coupled to the base plate 71 (by the magnetic force of the permanent magnet 73). ).
[0024]
As a result, the back surface of the first yoke 712 comes into contact with the support ball 79a, and the support frame 75 is sandwiched between the first yoke 712 and the second yoke 72 as shown in FIG. 29, and is positioned in the optical axis direction. .
[0025]
Fluoro-based grease is also applied to the contact surfaces of the support balls 79a, 79b, the first yoke 712, and the second yoke 72, and the support frame 75 is in a plane perpendicular to the optical axis with respect to the base plate 71. It can slide freely.
[0026]
The L-shaped shaft 711 supports the support frame 75 so as to be slidable only in the directions of arrows 713p and 713y with respect to the base plate 71, and thereby the relative rotation of the support frame 75 around the optical axis with respect to the base plate 71 ( Rolling).
[0027]
Note that the backlash between the L-shaped shaft 711 and the bearing portions 71d and 75d is set large in the optical axis direction, and the optical axis direction is obtained by holding the support balls 79a and 79b with the first yoke 712 and the second yoke 72. Prevents overlapping fitting with regulations.
[0028]
The surface of the first yoke 712 is covered with an insulating sheet 714, and a hard substrate 715 having a plurality of ICs thereon (position detecting elements 78p, 78y, output amplification ICs, coils 76p, 76y driving ICs, etc.) Shows the positioning hole 715a (two places) of the main plate 71 31 Are fitted into pins 71h (two places) shown in FIG. 5 and screwed to the holes 71g of the base plate 71 together with the holes 715b and the holes 712b of the first yoke 712.
[0029]
Here, the position detection elements 78p and 78y are positioned and soldered to the hard substrate 715 by a tool, and the flexible substrate 716 for signal transmission also has a range 715c in which the surface 716a is surrounded by a broken line on the back surface of the hard substrate 715 (FIG. 28)).
[0030]
A pair of arms 716 bp and 716 by extend from the flexible substrate 716 in a plane direction perpendicular to the optical axis, and are respectively hooked on hook portions 75 ep and 75 ey (see FIG. 32) of the support frame 75, thereby projecting elements 77 p and 77 y. And the terminals of the coils 76p and 76y are soldered.
[0031]
Accordingly, the light projecting elements 77p and 77y such as IRED and the coils 76p and 76y are driven from the hard substrate 715 via the flexible substrate 716.
[0032]
Arm portions 716 bp and 716 by of the flexible substrate 716 (see FIG. 28 Reference) has refracting portions 716 cp and 716 cy, respectively, and the elasticity of the refracting portions reduces the load on the arm portions 716 bp and 716 by when the support frame 75 moves around in a plane orthogonal to the optical axis. .
[0033]
The first yoke 712 has a projecting surface 712c formed by punching, and the projecting surface 712c passes through the hole 714a of the insulating sheet 714 and is in direct contact with the hard substrate 715. A ground (GND) pattern is formed on the hard substrate 715 side of the contact surface, and the first yoke 712 is grounded by screwing the hard substrate 715 to the ground plane, and becomes an antenna on the hard substrate 715. Eliminating noise.
[0034]
A mask 717 shown in FIG. 28 is positioned on the pin 71h of the base plate 71 and fixed on the hard substrate 715 with a double-sided tape.
[0035]
A permanent magnet through hole 71i (see FIGS. 28 and 31) is formed in the base plate 71, from which the back surface of the second yoke 72 is exposed. A permanent magnet 718 (locking magnet) is incorporated in the through hole 71i and is magnetically coupled to the second yoke 72 (see FIG. 29).
[0036]
A coil 720 (locking coil) is bonded to the lock ring 719 (see FIGS. 28, 29, and 33), and a bearing 719b (see FIG. 34) is provided on the back of the ear portion 719a of the lock ring 719. The armature rubber 722 is passed through the armature pin 721 (see FIG. 28), the armature pin 721 is passed through the bearing 719b, the armature spring 723 is then passed through the armature pin 721, and the armature 724 is fitted and fixed. To do.
[0037]
Therefore, the armature 724 can slide in the direction of the arrow 725 with respect to the lock ring 719 against the charging force of the armature spring 723.
[0038]
FIG. 34 is a plan view of the shake correction apparatus after assembly is viewed from the back direction of FIG. 28. In this figure, the outer diameter notches 719c (three places) of the lock ring 719 are formed as inner diameter protrusions 71j of the main plate 71. The lock ring 719 is attached to the base plate 71 by a known bayonet connection in which the lock ring 719 is pushed into the base plate 71 in accordance with (three places), and then the lock ring is rotated clockwise to prevent it from coming off.
[0039]
Therefore, the lock ring 719 can rotate around the optical axis with respect to the main plate 71. However, the lock rubber 726 (see FIGS. 28 and 34) is press-fitted into the main plate 71 in order to prevent the lock ring 719 from rotating and the notch 719c again being in phase with the projection 71j and disconnecting the bayonet coupling. Thus, the rotation of the lock ring 719 is restricted so that only the angle θ (see FIG. 34) of the notch 719d restricted by the lock rubber 726 can be rotated.
[0040]
A permanent magnet 718 (locking magnet) is also attached to the magnetic locking yoke 727 (see FIG. 28), and the holes 727a (two locations) are fitted into the pins 71k (see FIG. 34) of the base plate 71. These are screw-connected by holes 727b (2 places) and 71n (2 places).
[0041]
A known closed magnetic path is formed by the permanent magnet 718 on the base plate 71 side, the permanent magnet 718 on the locking yoke 727 side, the second yoke 72, and the locking yoke 727.
[0042]
The lock rubber 726 is prevented from coming off by screwing a lock yoke 727. In FIG. 34, the lock yoke 727 is omitted for the above explanation.
[0043]
A lock spring 728 is hung between the hook 719e of the lock ring 719 and the hook 71m of the base plate 71 (see FIG. 34), and urges the lock ring 719 clockwise. A suction coil 730 is inserted into the suction yoke 729 (see FIGS. 28 and 34), and is screwed through a hole 729 a of the base plate 71.
[0044]
The terminal of the coil 720 and the terminal of the adsorption coil 730 are soldered to the trunk 716d of the flexible substrate 716 in a twisted pair configuration of, for example, a four-wire tetron-coated wire.
[0045]
The mechanism portion of the shake correction apparatus described above is roughly divided into three elements: a correction means for decentering the optical axis, a means for supporting the correction means, and a means for locking the correction means.
[0046]
The correction means is assembled by a lens 74, a support frame 75, coils 76p and 76y, IREDs 77p and 77y, position detection elements 78p and 78y, ICs 731p and 731y, support balls 79a and 79y, a charge spring 710, and a support shaft 711. . Further, the support means includes a base plate 71, a second yoke 72, a permanent magnet 73, and a first yoke 712. The locking means are a permanent magnet 718, a lock ring 719, a coil 720, an armature shaft 721, an armature rubber 722, an armature spring 723, an armature 724, a lock rubber 726, a yoke 727, a lock spring 728, an adsorption yoke 729, and an adsorption coil 730. It is configured.
[0047]
Among the correction means, a correction optical system is formed by the lens 74 and the support frame 75, and PSDs 78p and 79y, ICs 731p and 731y, IREDs 77p and 77y form position detection means, and coils 76p and 76y, The two yokes 72, the permanent magnets 73, and the first yoke 712 constitute driving means. In other words, the correction means mainly comprises a correction optical system, a position detection means, and a drive means for driving the correction optical system.
[0048]
The shake correction device, the vibration detection means (see FIG. 27), and the calculation means shown in FIG. 35 below constitute a vibration isolation system (anti-vibration apparatus).
[0049]
ICs 731p and 731y on the hard substrate 715 are ICs for amplifying the outputs of the position detection terminals 78p and 78y, respectively, and the internal configuration is as shown in FIG. 35 (the ICs 731p and 731y have the same configuration. Shows only 731p).
[0050]
In FIG. 35, current-voltage conversion amplifiers 731ap and 731bp convert photocurrents 78i1p and 78i2p generated in a position detection element 78p (consisting of resistors R1 and R2) by a light projecting element 77p into voltages, and a differential amplifier 731cp converts each current. The difference output between the voltage conversion amplifiers 731ap and 731bp is obtained and amplified.
[0051]
As described above, the light emitted from the light projecting elements 77p and 77y is incident on the position detecting elements 78p and 78y via the slits 75ap and 75ay. However, when the support frame 75 moves in a plane perpendicular to the optical axis, Incident positions on the detection elements 78p and 78y change.
[0052]
The position detecting element 78p has sensitivity in the direction of the arrow 78ap (see FIG. 28), and the slit 75ap expands the light beam in the direction orthogonal to the arrow 78ap (78ay direction), and the light beam is narrowed in the arrow 78ap direction. Because of its shape, the photocurrent 78i of the position detecting element 78p is only when the support frame 75 moves in the direction of the arrow 713p. ₁ p, 78i ₂ The balance of p changes, and the differential amplifier 731cp outputs in accordance with the direction of the arrow 713p of the support frame 75.
[0053]
The position detection element 78y has detection sensitivity in the direction of arrow 78ay (see FIG. 28), and the slit 75ay extends in a direction orthogonal to the arrow 78ay (78ap direction), so that the support frame 75 is in the direction of arrow 713y. The position detecting element 78y changes the output only when it is moved to.
[0054]
The summing amplifier 731dp calculates the sum of the outputs of the current-voltage conversion amplifiers 731ap and 731bp (the total amount of light received by the position detection element 78p), and the driving amplifier 731ep receiving this signal drives the light projecting element 77p accordingly.
[0055]
Since the light projection amount of the light projecting element 77p is extremely unstable with respect to temperature or the like, the photocurrent 78i of the position detection element 78p is accordingly changed. ₁ p, 78i ₁ absolute amount of p (78i ₁ p + 78i ₂ p) changes. Therefore, the position of the support frame 75 is indicated (78i ₁ p-78i ₂ The output of the differential amplifier 731cp which is p) also changes.
[0056]
However, if the light projecting element 77p is controlled by the above drive circuit so that the total amount of received light is constant as described above, the output change of the differential amplifier 731cp is eliminated.
[0057]
Figure 28 Are located in a closed magnetic path formed by the permanent magnet 73, the first yoke 712, and the second yoke 72, and a current is passed through the coil 76p to drive the support frame 75 in the direction of the arrow 713p. Then, the support frame 75 is driven in the direction of the arrow 713y by passing a current through the coil 76y.
[0058]
In general, when the outputs of the position detection elements 78p and 78y are amplified by the ICs 731p and 731y and the coils 76p and 76y are driven by the outputs, the support frame 75 is driven and the outputs of the position detection elements 78p and 78y change.
[0059]
Here, when the driving direction (polarity) of the coils 76p and 76y is set to a direction in which the output of the position detection elements 78p and 78y is reduced (negative feedback), the position detection elements 78p and 78y are driven by the driving force of the coils 76p and 76y. The support frame 75 is stabilized at a position where the output is almost zero.
[0060]
A method of driving by negatively feeding back the position detection output in this way is called a position control method. For example, when a target value (for example, a camera shake angle signal) is mixed with the ICs 731p and 731y from the outside, the support frame 75 is extremely in accordance with the target value. Driven faithfully.
[0061]
Actually, the outputs of the differential amplifiers 731 cp and 731 cy are sent to a main board (not shown) via a flexible board 716, where analog / digital conversion (A / D conversion) is performed and taken into a microcomputer.
[0062]
The microcomputer appropriately compares and amplifies it with a target value (hand shake angle signal), performs phase advance compensation (to make the position control more stable) by a known digital filter technique, passes through the flexible board 716 again, and then returns to the IC 732 (coil 76p, 76y drive). The IC 732 drives the support frame 75 by performing known PWM (pulse width modulation) driving of the coils 76p and 76y based on the input signal.
[0063]
As described above, the support frame 75 is slidable in the directions of the arrows 713p and 713y, and the position is stabilized by the above-described position control method. However, in consumer optical equipment such as a camera, power consumption is prevented. The support frame 75 cannot always be controlled from the viewpoint.
[0064]
In addition, since the support frame 75 can move freely in a plane orthogonal to the optical axis in an uncontrolled state, measures are taken against the occurrence of sound and damage of the collision at the stroke end at that time. There is a need.
[0065]
As shown in FIGS. 34 and 36, three radially projecting projections 75f are provided on the back surface of the support frame 75, and the tips of the projections 75f are formed on the inner peripheral surface 719g of the lock ring 719 as shown in FIG. It is mated. Therefore, the support frame 75 is restrained in all directions with respect to the base plate 71.
[0066]
36 (a) and 36 (b) are plan views showing the relationship between the operation of the lock ring 719 and the support frame 75, and only the main part is extracted from the plan view of FIG. For easy understanding, the layout is slightly changed from the actual assembly state. Also, figure 36 As shown in FIGS. 29 and 33, the cam portion 719f (three places) in (a) is not provided over the entire region of the cylindrical generatrix of the lock ring 719. Is not visible, but is shown for illustration.
[0067]
Figure 36 As shown in FIG. 4, the coil 720 (720a is a lead wire of four twisted wires connected to the terminal 716e on the trunk 716d of the flexible substrate 716 through the outer periphery of the lock ring 719 with a flexible substrate or the like not shown). It enters the closed magnetic path sandwiched between the permanent magnets 718, and generates a torque for rotating the lock ring 719 around the optical axis by passing a current through the coil 720.
[0068]
The driving of the coil 720 is also controlled by a command signal input to a driving IC 733 on the hard board 715 from a microcomputer (not shown) via the flexible board 716, and the IC 733 drives the coil 720 by PWM.
[0069]
In FIG. 36 (a), the winding direction of the coil 720 is set so that when the coil 720 is energized, a counterclockwise torque is generated in the lock ring 719, whereby the lock ring 719 counters the spring force of the lock spring 728. Rotate counterclockwise.
[0070]
The lock ring 719 is in contact with the lock rubber 726 by the force of the lock spring 728 and is stable before the coil 720 is energized.
[0071]
When the lock ring 719 rotates, the armature 724 contacts the suction yoke 729 and contracts the armature spring 723, and the positional relationship between the suction yoke 729 and the armature 724 is equalized, and the lock ring 719 rotates as shown in FIG. Stop.
[0072]
FIG. 37 is a timing chart of lock ring driving.
[0073]
The coil 720 is energized (PWM drive indicated by 720b) at the arrow 719i in FIG. For this reason, the armature 724 comes into contact with the suction yoke 729 and is equalized when it is equalized.
[0074]
Next, when the coil 720 is deenergized at the time indicated by 720c in FIG. 37, the lock ring 719 tries to rotate clockwise by the force of the lock spring 728, but the armature 724 is attracted to the suction yoke 729 as described above. Therefore, the rotation is restricted. At this time, since the projection 75f of the support frame 75 is located at a position facing the cam portion 719f (the cam portion 719f rotates), the support frame 75 can move by the clearance between the projection 75f and the cam portion 719f. become.
[0075]
For this reason, the support frame 75 falls in the direction of gravity G (see FIG. 36B). 37 Since the support frame 75 is also in the controlled state at the time of the arrow 719i, it does not fall.
[0076]
The support frame 75 is restrained by the inner periphery of the lock ring 719 when not controlled, but actually has a backlash corresponding to the backlash of the protrusion 75f and the inner peripheral wall 719g. That is, the support frame 75 falls in the direction of gravity G by this backlash, and the center of the support frame 75 and the center of the base plate 71 are shifted. For this reason, control is performed to slowly move to the center of the base plate 71 (the center of the optical axis) after spending, for example, one second from the point of the arrow 719i.
[0077]
This is because if the photographer is suddenly moved to the center, the photographer feels the image shake through the correction lens 74 and is uncomfortable. Even if exposure is performed during this time, image deterioration due to the movement of the support frame 75 does not occur. It is to make it. (For example, the support frame is moved 5 μm in 1/8 second)
Specifically, the outputs of the position detection elements 78p and 78y at the time of the arrow 719i in FIG. 37 are stored, and the control of the support frame 75 is started using the values as target values, and then spent 1 second at the preset optical axis center (See 75g in FIG. 37).
[0078]
After the lock ring 719 is rotated (unlocked), the support frame 75 is driven on the basis of the target value from the vibration detecting means (overlapping with the above-described movement of the center position of the support frame 75) to prevent vibration. It will start.
[0079]
Here, if the image stabilization is turned off at the point of the arrow 719j in order to end the image stabilization, the target value from the vibration detection unit is not input to the correction drive unit that drives the correction unit, and the support frame 75 is controlled to the center position. Stop. At this time, the energization to the adsorption coil 730 is stopped (730b). Then, the attracting force of the armature 724 by the attracting yoke 729 disappears, and the lock ring 719 is rotated clockwise by the lock spring 728 and returns to the state of FIG. At this time, since the lock ring 719 abuts against the lock rubber 726 and is restricted from rotating, the collision sound of the lock ring 719 at the end of the rotation can be suppressed to a low level.
[0080]
Thereafter (for example, after 20 msec), the control to the correction driving means is cut off, and the timing chart of FIG.
[0081]
38 and 39 are block diagrams showing an outline of the image stabilization system.
[0082]
In these figures, 91 is a figure. 27 Is a vibration detection means corresponding to the vibration detection means 83p, 83y, and a sensor output calculation for obtaining an angular displacement by integrating a shake detection sensor for detecting an angular velocity of a vibration gyro and the like after cutting a DC component of the shake detection sensor output. Consists of means.
[0083]
The angular displacement signal from the vibration detection unit 91 is input to the target value setting unit 92. As shown in FIG. 38, the target value setting means 92 is composed of a variable differential amplifier 92a and a sample and hold circuit 92b. The sample and hold circuit 92b is always input to the variable differential amplifier 92a because it is being sampled. Both signals are always equal and their output is zero. However, when the sample-and-hold circuit 92b is in a hold state by an output from the delay means 93 described later, the variable differential amplifier 92a starts to output continuously at that point in time.
[0084]
The amplification factor of the variable differential amplifier 92a is variable by the output of the image stabilization sensitivity setting means 94. This is because the target value signal of the target value setting unit 92 is a target value (command signal) for causing the correction unit 910 to follow, but the correction amount (anti-vibration sensitivity) of the image plane with respect to the driving amount of the correction unit 910 is This is to compensate for the change in the anti-vibration sensitivity in order to change due to optical characteristics based on the focus change such as zoom and focus.
[0085]
Accordingly, as shown in FIG. 38, the image stabilization sensitivity setting unit 94 receives zoom focal length information from the zoom information output unit 95 and focus focal length information based on distance measurement information from the exposure preparation unit 96, and Based on the information, the image stabilization sensitivity is calculated or the image stabilization sensitivity information set in advance based on the information is extracted, and the amplification factor of the variable differential amplifier 92a in the target value setting unit 92 is changed.
[0086]
The correction drive unit 97 corresponds to the ICs 731p, 731y, and 732 mounted on the hard board 715 in FIG. 28, and the target value from the target value setting unit 92 is input as a command signal.
[0087]
The correction starting means 98 is a switch for controlling the connection between the IC 732 on the hard board 715 of FIG. 28 and the coils 76p and 76y provided in the correction means 910. 39 As shown in the figure, normally, the switch 98a is connected to the terminal 98c so that both ends of the coils 76p and 76y are short-circuited. When the signal from the AND means 99 is input, the switch 98a is connected to the terminal 98b. And the correction means 910 is in a controlled state (not yet corrected for shake, but power is supplied to the coils 76p and 76y, and the correction means 910 is stabilized at a position where the signals of the position detection elements 78p and 78y become almost zero. Leave). At the same time, the output signal from the logical product means 99 is also input to the locking means 914, whereby the locking means 914 releases the locking of the correction means 910.
[0088]
The correction means 910 inputs the position signals of the position detection elements 78p and 78y to the correction drive means 97, and performs position control as described above.
[0089]
When both the SW1 signal generated by half-pressing the release means 911 and the output signal of the image stabilization switching means 912 are input to the logical product means 99, the ANDAND 99a (see FIG. 38), which is a component, outputs the signal. That is, as shown in FIG. 38, when the photographer operates the anti-shake switch of the anti-shake switching means 912 and half-presses the release means 911, the correcting means 910 is unlocked and enters the control state.
[0090]
As shown in FIG. 38, the SW1 signal generated by half-pressing the release unit 911 is input to the exposure preparation unit 96, thereby performing photometry, distance measurement, and lens focusing drive, and the focus information obtained here. Is input to the image stabilization sensitivity setting means 94.
[0091]
The delay means 93 receives the output signal of the logical product means 99 and outputs it after one second, for example, and outputs the target value signal from the target value setting means 92 as described above.
[0092]
Although not shown, the vibration detecting unit 91 starts to be activated in synchronization with the SW1 signal generated by half-pressing the release unit 911. As described above, the sensor output calculation including a large time constant circuit such as an integrator requires a certain amount of time from the start to the stabilization of the output.
[0093]
The delay means 93 plays a role of outputting the target value signal to the correction means 910 after waiting until the output of the vibration detection means 91 becomes stable, and starts to prevent vibration after the output of the vibration detection means 91 becomes stable. I have to.
[0094]
The exposure means 913 performs mirror up by SW2 signal input generated by the push-off operation of the release means 911, opens and closes the shutter at the shutter speed determined based on the photometric value of the exposure preparation means 96, and performs mirror down. To finish shooting.
[0095]
When the photographer releases the release means 911 and turns off the SW1 signal after the photographing is finished, the AND means 99 stops the output, the sample hold circuit 92b of the target value setting means 92 enters the sampling state, and the variable differential The output of the amplifier 92a becomes zero. Accordingly, the correction unit 910 returns to the control state where the correction drive is stopped.
[0096]
Since the output of the logical product means 99 is turned off, the locking means 914 locks the correction means 910, and then the switch 98a of the correction starting means 98 is connected to the terminal 98c, and the correction means 910 is not controlled. .
[0097]
The vibration detecting unit 91 continues to operate for a certain time (for example, 5 seconds) after the operation of the release unit 911 is stopped by a timer (not shown), and then stops. This is because the photographer frequently performs the release operation after stopping the release operation, so that the vibration detection means 91 is prevented from starting every time in such a case, and the waiting time until the output is stabilized is shortened. Therefore, when the vibration detecting means 91 has already been activated, the vibration detecting means 91 sends an activated signal to the delay means 93 to shorten the delay time.
[0098]
FIG. 40 is a flowchart showing a series of operations when the above-described operations are processed by the microcomputer, which will be briefly described below.
[0099]
When the camera is turned on, the microcomputer first checks the state of the image stabilization switch. If it is on, the microcomputer next determines whether or not the SW1 signal is generated by half-pressing the release means 911 (# 5001). → # 5002). If the SW1 signal has been generated, the internal timer is started (# 5003), and then the metering, distance measurement, shake detection is started, and further, the lock release is performed to enable the image stabilization control by the correction means 910. (# 5004).
[0100]
Next, it is checked whether or not the time measured by the timer has reached a predetermined time t1, and if not, the process stays at this step until it reaches (# 5005). As described above, this is a process for waiting for a time until the sensor output is stabilized. Thereafter, when a predetermined time t1 elapses, the correction unit 910 is driven based on the target value signal, and the image stabilization control is started (# 5006).
[0101]
Next, it is checked whether or not the SW2 signal is generated by pressing the release means 911 (# 5007), and if it is not generated, it is determined again whether or not the SW1 signal is generated. If it has not occurred (NO in # 5008), the image stabilization control is stopped and the correction means 910 is locked at a predetermined position (# 5011 → # 5012).
[0102]
If the SW2 signal is not generated but the SW1 signal is generated, the operations of steps # 5007 → # 5008 → # 5007... Are repeated. When the release means 911 is pressed in this state and the SW2 signal is generated (YES in # 5007), the film is exposed (# 5009). Then, the state of the SW1 signal is checked (# 5010). When the SW1 signal is not generated, the image stabilization control is stopped and the correction unit 910 is locked at a predetermined position (# 5011 → # 5012).
[0103]
When the above operation is completed, the timer is then reset once and restarted (# 5013), and it is determined again whether the SW1 signal is generated within a predetermined time (here, within 5 seconds) (# 5014). → # 5015 → # 5014 ……). If the SW1 signal is generated again within 5 seconds after stopping the image stabilization (YES in # 5015), the photometry, distance measuring operation and the correcting means 910 are released (# 5016), and the shake detection is performed. Since it continues as it is, drive control of the correction means 910 is immediately performed based on the target value signal (# 5006), and the same operation as described above is repeated thereafter.
[0104]
That is, by performing such processing, when the photographer continues the release operation after stopping the release operation as described above, the vibration detecting means 91 is activated each time and the standby until the output is stabilized. Inconvenience can be eliminated.
[0105]
On the other hand, if the SW1 signal is not generated within 5 seconds after stopping the vibration isolation (YES in # 5014), the vibration detection is stopped (the drive of the vibration detecting means 91 is stopped) (# 5017). Thereafter, the process returns to step # 5001 to enter a state where the image stabilization switch is on standby.
[0106]
[Problems to be solved by the invention]
In the shake correction device of the vibration isolation system described above, the terminals of the coils 76p and 76y fixed to the support frame 75 are soldered to the arm portions 716bp and 716by of the flexible substrate 716. Here, since the coils 76p and 76y are bonded and fixed to the support frame 75, the amount of bonding must be strictly controlled. Specifically, if the amount of adhesion is large, the adhesive interferes with other members and the support frame 75 cannot be driven smoothly. If the amount of adhesion is small, problems such as dropping off of the coils 76p and 76y occur. It was unreliable.
[0107]
Also, since the coil terminal is soft, it is necessary to keep the coil terminal in contact with the soldering land with tweezers when soldering, which not only deteriorates workability but also causes poor soldering as described above. Problems occurred and were not reliable.
[0108]
Further, the coil 720 of the lock ring 719 is also soldered to the trunk portion 716d of the flexible substrate 716 from the back surface (the right side in FIG. 28), but the coil 76p and the coil 76y are connected to the flexible substrate 716 (the arm portions 716bp and 716by). Since it is different from the soldering direction, that is, each of the coil 76p, the coil 76y, and the coil 720 is soldered to the flexible substrate 716. However, since the soldering directions are different, the assembly workability is poor and the soldering reliability is low. turn into.
[0109]
Further, since the coils 76p and 76y and the coil 720 are disposed with the ground plate 71 interposed therebetween, there is a problem that the thickness of the entire apparatus becomes thick.
[0110]
(Object of the invention) the purpose An object of the present invention is to provide a shake correction device capable of simplifying assembly of the device and improving the reliability of shake correction.
[0112]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides: Comprising a permanent magnet on the component surface; Correction means for correcting shake; A correction drive coil for driving the correction means on the first surface facing the permanent magnet; Support means for supporting the correction means; Provided to face a second surface opposite to the first surface of the support means; The correction means rotation A shake correction apparatus having locking means for locking Because , On the first surface of the support means, Drive the locking means for Locking drive coil In which a position detecting means for detecting movement of the correcting means is mounted on the print surface The substrate is sandwiched between the correction means. opposite side Arranged in connection with the support means The pin terminals of the correction driving coil and the locking driving coil are extended and connected to the printed surface. This is a shake correction device.
[0123]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on illustrated embodiments.
[0124]
1 to 10 are diagrams showing details of each member showing the shake correction apparatus according to the first embodiment of the present invention, and FIG. 1 is a main part of the shake correction apparatus according to the first embodiment. FIG. 2 is a perspective view showing the components of FIG. 2 in an exploded view, and FIG. 2 is a view seen from the left direction of FIG. 1 (for the sake of explanation, the hard board 111 corresponding to the hard board 715 is removed so that the inside can be seen). 3A is a view as seen from the direction of the arrow A in FIG. 2, FIG. 3B is a view showing a configuration of a portion related to position detection of the correction lens 11, and FIG. 4 is a cross-sectional view taken along the line BB ′ in FIG. 5 is a diagram showing a plane, a side surface, and a cross section of the coil unit, FIG. 6 is a diagram for explaining a configuration of a part related to a means for driving the correction lens 11 in comparison with a conventional example, and FIG. 7 is a diagram in FIG. FIG. 8 is a view showing the hard substrate 111, and FIG. 8 shows the support frame 112 and the base plate 13 also shown in FIG. FIG. 9 is a view showing the lock ring 113 and the rolling regulating ring 112 shown in FIG. 1 as seen from the face of FIG. 2, and FIG. It is a figure for doing.
[0125]
First, the configuration of the shake correction apparatus will be briefly described with reference to FIG.
[0126]
The correction lens 11 is supported by the support frame 12, and the support frame 12 is coupled to the base plate 13. Then, the correction means consisting of the correction lens 11 and the support frame 12 is driven in the pitch direction 114p and the yaw direction 114y by a drive means consisting of permanent magnets and coils, which will be described later, and the image blur is corrected. Reference numeral 113 denotes a lock ring. When the output of a step motor, which will be described later, is transmitted to the rack 113a, the support frame 12, that is, the correcting means is locked (locked) at a predetermined position. Reference numeral 112 denotes a rolling restricting member, which includes three shaft portions 112a. ₁ ~ 112a _Three Is fitted to the support frame 12 via the base plate 13 to restrict rolling of the support frame 12 around the optical axis. Reference numeral 111 denotes a hard substrate (printed substrate) on which various terminals such as the above-described step motor and coil, as well as a hall element to be described later constituting the position detecting means are concentrated and wired on the same plane.
[0127]
Hereinafter, a detailed configuration will be described with reference to FIGS.
[0128]
Reference numeral 12 denotes a support frame (see FIGS. 2 and 8) that supports the correction lens 11 corresponding to the support frame 75 of FIG. 28. The support frame 12 has permanent magnets 14p and 14y (in FIG. 2, hidden by yokes 15p and 15y). The yokes 15p and 15y that have been attracted are fixed by caulking or screwing.
[0129]
In general, it is difficult to complicate the shape of the permanent magnet. Therefore, when attaching to the support frame 12, an operation such as adhesion is required. However, there is a problem that the bonding work is difficult to manage and has low reliability.
[0130]
Therefore, in this embodiment, crimping holes and screw holes are provided in the yokes 15p and 15y, which can be arbitrarily shaped (not visible because they are the back surface in FIG. 2), and the yokes 15p and 15y are fixed to the support frame 12, A method of fixing the permanent magnets 14p and 14y on the yokes 15p and 15y (see FIG. 3B) and fixing them (see FIG. 4B) eliminates the bonding process and improves the reliability. .
[0131]
Reference numeral 13 denotes a ground plate corresponding to the ground plate 71 of FIG. 28, and coils 16p and 16y are attached to the surface of the ground plate 13 facing the permanent magnets 14p and 14y (see FIG. 4B). As shown in FIG. 5, the coil 16p (same as 16y) is integrally formed with a resin material (ABS) coil frame 16a and is a terminal pin (stud pin) which is a conductive member press-fitted into the coil frame 16a. Both terminals of the coil 16p are connected to 16b to form a unit. 5 (a) is a plan view of the coil unit 16, FIG. 5 (b) is a side view, and FIG. 5 (c) is a cross-sectional view along CC ′ in FIG. 5 (b).
[0132]
In general, when attaching a coil to a member, it is necessary to first bond the coil to the member, then solder both terminals of the coil to the connection, and then assemble the lead wires of both terminals. If the process is performed, for example, in the main work process incorporated in the main plate 13, the time of the main work becomes long, which is not preferable. In addition, replacement of the defective coil is troublesome. Since the lead wire is soft even when the coil terminal is soldered, it is necessary to pinch the lead wire with tweezers or the like and solder it, and it is not preferable to collect the lead wire in the main operation process as well.
[0133]
In this embodiment, the coil is unitized and the coil 16p (16y) is patched to the base plate 13 by the positioning pins 16c and the claws 16d provided on the coil frame 16a. are doing.
[0134]
The lead wire is already connected to the firm terminal pin 16b, and is penetrated and soldered to the hard substrate 111 described later. Therefore, the electrical connection of the coil terminals is very easy and reliable.
[0135]
The relationship between the yokes 15p and 15y, the permanent magnets 14p and 14y, and the coils 16p and 16y that constitute the driving means of the correcting means configured as described above will be described with reference to FIG. 6A shows the first embodiment, FIG. 6B shows an inappropriate example, and FIG. 6C shows a conventional example.
[0136]
In the conventional example of FIG. 6C, the coils 76 p and 76 y are attached to the support frame 75. And the permanent magnet 73 forms the closed magnetic path shown with the broken line 73b by the 1st yoke 712 and the 2nd yoke 72 like illustration. The reason why the closed magnetic circuit is formed in this way is that the flow of magnetic flux is thereby adjusted and the driving efficiency is improved.
[0137]
In the present embodiment, when the permanent magnets 14p (14y) are attached to the support frame 12, in order to form a closed magnetic path, as shown in FIG. The counter yokes 15ap and 15ay may be provided at positions facing this. Thereby, the closed magnetic path 14a is formed.
[0138]
However, in the first embodiment, the balance between the improvement in driving efficiency by providing the opposing yokes 15ap and 15ay and the deterioration in follow-up caused by the increase in weight by attaching the opposing yokes 15ap and 15ay as well. From the viewpoint, as shown in FIG. 6A, the open yoke is used without providing the opposing yoke. In other words, the configuration focuses on the fact that the absolute value of power consumption can be reduced by not increasing the weight, rather than improving the driving efficiency.
[0139]
In addition, the provision of the yoke 15p (15y) as described above simplifies the attachment of the permanent magnet 14p (14y) to the support frame 12, but the yoke 15p (15y) As shown in FIG. 6A, the magnetic flux 14a flows, thereby preventing the magnetic flux density from being lowered. As the thickness of the permanent magnet 14p (14y) increases, the magnetic flux density to the opposing coil 16p (16y) can be increased. Further, even if the permanent magnet 14p (14y) is not thick, the same applies if the total thickness when the yoke 15p (15y) is attached is not thick.
[0140]
Therefore, in the present embodiment, even when the open magnetic circuit is used, the yoke 15p (15y) is effectively utilized to simplify the collection of the permanent magnet 14p (14y), and the magnetic flux density can be reduced even with the thin permanent magnet 14p (14y). The permanent magnet 14p (14y) can be reduced in cost.
[0141]
As shown in FIGS. 2 and 8, the support frame 12 has arm portions 12a extending radially in three directions, and rollers 17 are screwed to the arm portions 12a. The base plate 13 is inserted into the guide groove 13a (see FIGS. 1 and 3A). Since the guide groove 13a is a long hole extending in the direction of the arrow 13b as shown in FIG. 3A, each of the three rollers 17 can move in this direction. That is, the support frame 12 can freely slide in all directions within the plane including the base plate 13 (the position is restricted only in the optical axis direction 13c in FIG. 3A).
[0142]
During assembly, the roller 17 is screwed to one or two of the three arm portions 12a of the support frame 12, and the screwed roller 17 is inserted into the guide groove 13a of the base plate 13 for support. The frame 12 is placed on the base plate 13, and finally the remaining roller 17 is screwed to the arm 12a of the support frame 12 through the remaining guide groove 13a. To do.
[0143]
The backlash of the roller 17 and the guide groove 13a in the optical axis direction 13c needs to secure “40 μm” in consideration of, for example, a temperature variation “20 μm” and a dimensional tolerance variation “20 μm”. The inclination of 11 becomes loose. However, since the three guide grooves 13a are provided in the peripheral portion of the base plate 13, the mutual spans are long, so that the tilt play of the support frame 12 with respect to the base plate 13 due to the fitting play is accommodated within the optical tolerance.
[0144]
As described above, the support of the support frame 12 by the roller 17 and the guide groove 13a greatly improves the assembly workability as compared with the sandwich support method used in FIG. 28. In the sandwich support described in FIG. The friction between the support balls 79a and 79b and the first yoke 712 and the second yoke 72 exerted by the charging force of the spring 710 deteriorates the driving accuracy. However, in this embodiment, the charging support is not provided. Driving friction can also be reduced.
[0145]
Here, it is possible to adjust the inclination of the correction lens 11 by using the above-described roller 17 as an eccentric roller as shown in FIG. 4A (FIG. 4A is an example of FIG. 4B). It is the figure which expanded the part). That is, by rotating the roller 17, the arm portion 12 a moves back and forth in the optical axis direction. Therefore, by adjusting the position of the three arm portions 12 a in the optical axis direction with the roller 17, the inclination of the correction lens 11 is adjusted. The roller 17 can be made unrotatable to the arm portion 12a by tightening the screw 17a after adjustment.
[0146]
Thus, by making the roller 17 an eccentric roller, a special tilt adjusting means can be eliminated, and the entire apparatus can be made compact.
[0147]
A lock ring 113 shown in FIGS. 9A-1 and 9A-2 is rotatably supported on the base plate 13 from the back side in FIG. 2, and a step motor 19 (also attached to the base plate 13 ( A pinion (not shown) that is an output shaft of FIG. 2 meshes with the rack 113a to drive the lock ring 113 in the rotational direction. The four cams 113b provided on the lock ring 113 lock and unlock the support frame 12 in relation to the four-point protrusion 12b shown in FIG.
[0148]
That is, when the lock ring 113 shown in FIG. 9 (a-1) is rotated counterclockwise, the cam portion 113b of the lock ring 113 is separated from the protrusion 12b of the support frame 12, so that the support frame 12 is attached to the lock ring 113. However, when the lock ring 113 is rotated clockwise, the flat portion 113c of the cam portion 113b comes into contact with the projection 12b, and the support frame 12 and the lock ring 113 are engaged. That is, the support frame 12 is locked with respect to the main plate 13.
[0149]
Accordingly, when shake correction is performed, the lock ring 113 is driven counterclockwise by the step motor 19 to bring the support frame 12 into a free state with respect to the lock ring 113. On the other hand, at the end of shake correction, the lock ring 113 is turned clockwise. The support frame 12 is locked with respect to the main plate 13 by being rotated around.
[0150]
In the prior art, a three-point protrusion was used as shown in FIG. 36, but in this embodiment, a four-point protrusion is used as shown in FIG. This is because when the support frame 12 is locked, the amount in the direction of gravity applied during photographing of the backlash between the lock ring 113 and the support frame 12 is reduced. This will be described with reference to FIGS. 10 (a) and 10 (b).
[0151]
10A-1 is a schematic diagram of a conventional support frame 75 and a lock ring 719 with a three-point protrusion, and FIG. 10B-1 is a diagram of the support frame 12 and the lock ring 113 with a four-point protrusion according to the present embodiment. It is a schematic diagram.
[0152]
In both cases, it is assumed that the radial gap (fitting play) from the tips of the protrusions 75f and 12b to the lock ring inner peripheral walls 719g and 113g is “0.2 mm” (see FIGS. 10A-2 and 10B-2). See enlarged view). In addition, the direction of gravity applied to the support frames 75 and 12 during photographing is the same as the pitch direction 114p (hereinafter also referred to as 114 direction).
[0153]
In the case of FIG. 10A-2, the play in the gravity direction (114p direction) is “0.39 mm” from FIG. Protrusion 75f ₁ Is 0.2 mm because it extends along the direction of gravity. Therefore, the play in the 114p direction is “total 0.59 mm”. Also, from the figure, the play in the horizontal direction (114y direction) is “± 0.23 mm”. At the time of shooting, it is common to hold the camera with the 114p or 114y direction as the direction of gravity. If the play is "0.59 mm" at this time, the support frame 75 is displaced from the center of the optical axis by that amount (due to the influence of gravity). . For example, when shooting with the 114p direction set as the direction of gravity, the projection 75f ₁ Is in contact with the inner peripheral wall 719g of the lock ring, and a gap of "0.59mm" is formed in the upward direction.
[0154]
It is assumed that the optical adjustment is performed at the time of shipment so that the optical performance becomes the best in such a state. When the camera is repositioned and the 114y direction is the gravitational direction, gravity is not applied in the horizontal direction (114p direction), so the support frame 75 can be positioned at any position in the horizontal direction with a play of “0.59 mm”. In some cases, the loss of optical balance will increase.
[0155]
In the case of this embodiment, as can be seen from FIG. 10B-2, the backlash reaches the range of “± 0.2 mm” in both the gravity direction 114p and the horizontal direction 114y. That is, the four-point protrusion can suppress the backlash maximum amount to 2/3 compared to the three-point protrusion. Of course, even in the case of a four-point protrusion, if the direction of 45 degrees obliquely is changed to the direction of gravity, the amount of play increases by √ (2) times. However, since such shooting is rare, it is considered that there is substantially no problem.
[0156]
The advantages of the four-point protrusion over the three-point protrusion are summarized as follows. ₁ , 12b _Three Is 114p direction, 12b ₂ , 12b _Four Can be arranged in the direction in which gravity is applied to the photographer (114p or 114y). Therefore, the backlash at the time of locking is the same for each protrusion. The protrusions that do not follow the direction of gravity are that the backlash in the direction of gravity is larger than the minimum backlash (diameter, 0.2 mm in FIG. 10 (a-2)).
[0157]
If there is no gap between the lock ring 113 and the support frame 12, there is a risk that the lock ring 113 will not rotate well due to friction between the lock frame 113. ing. At this time, the play in the gravity direction and the horizontal direction at the time of shooting is larger than the set play in the case of the three-point protrusion, but the protrusions are arranged in the gravity direction and the right angle direction (horizontal direction) with the four-point protrusion. Thus, the play in the gravitational direction and the horizontal direction at the time of shooting can be made the same amount as the set play.
[0158]
As described above, the support frame 12 is coupled to the base plate 13 by the rollers 17 and the guide grooves 13a, and the position of the support frame 12 is regulated in the optical axis direction. This support method is excellent in assemblability, and the guide groove 13a is formed integrally with the base plate 13, and the fitting management between the roller 17 and the hole of the guide groove 13a is easy to perform (generally, many lens barrels are used). It is easy to understand considering the relationship between the roller and cam used). Furthermore, by making the roller 17 a known eccentric roller, there is an advantage that the inclination between the support frame 12 and the base plate 13 can be adjusted by the rotation of the roller 17.
[0159]
However, in the case of the above support method, the support frame 12 can freely move in the pitch direction 114p and the yaw direction 114y (shake correction direction) shown in FIG. 2 and also rotates in the rolling direction 114r. This rotation deteriorates the shake correction accuracy.
[0160]
Therefore, in the present embodiment, the following three methods are adopted in order to reduce the influence of the rolling.
[0161]
1) Rolling is gradually expanded when the central axis of the thrust by the coil and the central axis in the position detection direction of the support frame are displaced. In the conventional example of FIG. 28, for example, the thrust center of the coil 76p is on the axis 713p that coincides with the center of gravity of the correction lens 74, but the center axis of the position detection direction is 78ap, and both directions are aligned. The position is misaligned. Therefore, if rolling occurs when the support frame 75 moves in the 713p direction by the thrust of the coil, a phase shift occurs between the movement of the support frame 75 on the shaft 78ap and the movement of the support frame 12 on the shaft 713. Cannot be performed well. (In the conventional example, the support shaft 711 is provided for the countermeasure, but it is not possible to take measures against the minute rolling caused by the backlash between the support shaft 711 and the support frame 75).
In this embodiment, for example, the above measures are taken by matching (114p, 114y) the sensitivity axes of Hall elements 110p, 110y, which are position detection means described later, and the thrust central axes of coils 16p, 16y.
[0162]
2) FIG. 8B is a view of only the base plate 13 of FIG. 2 seen from the back side, and is a long hole 13d extending in the 114y direction. ₁ , 13d ₂ , 13d _Three Is provided. This long hole 13d ₁ , 13d ₂ , 13d _Three Further, a shaft portion 112a extending in the direction opposite to the paper surface from the rolling restricting ring 112 shown in FIGS. 9B-1 and 9B-2. ₁ 112a ₂ 112a _Three Each penetrates. The shaft portion 112a ₁ And long hole 13d ₁ , Shaft 112a _Three And long hole 13d _Three Are in a fitting relationship, and from these two points, the rolling restricting ring 112 can move only in the 114y direction with respect to the main plate 13.
[0163]
The long hole 13d ₂ Is a long hole 13d ₁ , 13d _Three (Although drawn in the drawing in a similar manner), the shaft 112a ₂ The mating play is increased. This is because the three shaft portions 112a ₁ 112a ₂ 112a _Three This is because, if they are both fitted, overlapping fitting occurs, and the movement between the rolling regulation ring 112 and the main plate 13 becomes astringent. That is, it is preferable to open any one of the three long holes.
[0164]
Now, the long hole 13d ₁ The span in the 114y direction is a long hole 13d. ₂ Longer hole 13d _Three Is longer. Therefore, the long hole 13d ₁ And long hole 13d _Three Is a fitting hole, the shaft portion 112a ₁ 112a _Three Even when the fitting play occurs, the rolling play between the rolling restricting ring 112 and the main plate 13 can be reduced. (Long hole 13d ₁ And long hole 13d ₂ ) Is the fitting hole, the rolling back of the both will be large because the span in the 114y direction is short)
The rolling regulating ring 112 is patched in the optical axis direction by claws 13k (see FIGS. 4B and 8B) provided on the base plate 13. Shaft portion 112a of the rolling regulating ring ₁ 112a ₂ 112a _Three Is a long hole 12c extending in the 114p direction provided on the back surface of the support frame 12 through the base plate 13. ₁ , 12c ₂ , 12c _Three (See the rear view of the support frame in FIG. 8A and FIG. 4B). Again, the long hole 12c ₁ And shaft part 112a ₁ , 12c ₂ And shaft part 112a ₂ Is a fitting relationship, and the elongated hole 12c _Three By setting a large value, overlapping mating is avoided. At this time, the long hole 12c _Three The reason for opening a large hole is the same as in the case of the long hole 13d. Therefore, the support frame 12 can move only in the 114p direction with respect to the rolling restriction ring 112.
[0165]
With the configuration as described above, the support frame 12 can move only in the 114p and 114y directions with respect to the base plate 13, and is restricted in the rolling direction 114r.
[0166]
The rolling restricting method of the correcting means (comprising the support frame 12 and the correcting lens 11) described above has the following merits as compared with the conventional example.
[0167]
The support shaft 711 for restricting rolling in the conventional example of FIG. 28 is provided on the same plane as the support frame 75. As can be seen from FIG. 4B, the rolling restricting ring 112 in this embodiment is provided on the opposite surface with the ground plate 13 (supporting means) of the support frame 12 (correcting means) interposed therebetween. For this reason, the step motor 19 can be arranged in an empty space where the support shaft 711 has existed (see FIG. 2). Since the rolling restricting ring 112 is thin, the dimension does not increase even if it is provided on the back surface of the main plate 13. (If the stepping motor 19 is provided on the back surface of the base plate 13 due to its thickness, the entire shake correction device is enlarged accordingly.)
Further, by arranging the coils 16p and 16y on the same plane, all the terminals of the step motor 19 and the coils 16p and 16y can be directed in the same direction.
[0168]
3) Although the rolling of the support frame 12 is restricted by the action of the rolling restricting ring 112 as described above, in reality, the minute rolling due to the fitting play between the shaft portion 112a and the elongated holes 13d and 12b still remains.
[0169]
In FIG. 2, a spring 18 is provided between a hook 12d provided on the arm 12a on the support frame 12 and a hook 13e provided around the base plate 13 (see FIGS. 2 and 4).
[0170]
As shown in FIG. 2, the springs 18 extend radially from the center of the support frame 12 in three directions, and pull the support frame 12 in a split state. Since the hook 12d is provided at a position far away from the center of the support frame 12 in the radial direction, when a force in the rolling direction acts on the support frame 12, the force is suppressed by the elastic force of the springs arranged in the eight split directions. I can do it. That is, since the rolling regulation is elastically performed, it is possible to prevent a minute rolling play from occurring.
[0171]
Due to the operations 1) to 3), the shake correction apparatus according to the present embodiment can significantly reduce the influence of rolling.
[0172]
As described above, the terminal pin 16b of the coil formed as a unit extends in the upward direction in the drawing of FIG. The terminal pin 19a of the drive coil of the step motor 19 also extends in this direction.
[0173]
FIG. 7 shows a hard substrate 111 provided in the shake compensation apparatus according to the present embodiment. Hall elements 110p and 110y (position detection means described later) are provided on the back side of the illustrated patterns 111cp and 111cy. Only the positional relationship is shown) is connected by reflow. In addition, although the example using a Hall element is shown as the position detection means, any magnetic detection means such as an MR element may be used. Further, optical detection means such as a photo reflector may be used.
[0174]
The hard board 111 is attached to the ground board 13 using the positioning pins 13f of the base board 13 and the holes 111d of the hard board 111 as a guide, and screws are passed through the holes 111e and fixed to the screw holes 13g. At this time, both the terminal pins 16b and 19a naturally penetrate the holes 111b and 111a, respectively. The holes 111a and 111b are through holes, and are electrically connected to the terminal pins 16p and 19a by soldering.
[0175]
In this way, positioning for soldering (for example, soldering while holding a lead wire with a pincette is held on a terminal) is unnecessary, and all the soldering directions are on one plane. Workability is very good and reliability is high.
[0176]
As the position detection means attached to the hard substrate 111, the Hall elements 110p and 110y are used as described above (see FIG. 3B and FIG. 6B).
[0177]
Hereinafter, the operation will be described with reference to FIG.
[0178]
The Hall element 110p (110y) changes its output in response to changes in the surrounding magnetic field. In FIG. 6B, the Hall element 110p (110y) faces the permanent magnet 14p (14y) magnetized in both poles, and becomes permanent with the Hall element 110p (110y) as the support frame 12 is driven (for example, in the 114p direction). Since the relationship between the magnets 14p (14y) is deviated, the magnetic field strength applied to the Hall element 110p (110y) changes, and the Hall element 110p (110y) outputs a corresponding output to thereby change the position of the support frame 12. To detect.
[0179]
The position of the Hall element 110p (110y) can be detected simply by facing the permanent magnet 14p (14y) as described above. As in the conventional example, the IREDs 77p and 77y and the PSDs 78p and 78y are provided, and the IREDs 77p and 77y There is a merit that the work is easier than the electrical connection work (the work of soldering to the arm portions 716 bp and 716 by of the flexible substrate 716). However, it has the following disadvantages.
[0180]
First, the magnetic field strength of the permanent magnet 14p (14y) varies greatly with temperature, and the sensitivity of the Hall element 110p (110y) is highly temperature dependent. Second, since the magnetic field generated by the coil 16p (16y) also affects the Hall element 110p (110y), the magnetic field change caused by the movement of the actual permanent magnet 14p (14y) and the magnetic field change caused by the coil 16p (16y) are also detected. As a result, the detection error increases.
[0181]
In the present embodiment, the problems due to the Hall element are solved by the following two configurations.
[0182]
1) A yoke 15p (15y) is provided between the Hall element 110p (110y) and the permanent magnet 14p (14y) facing each other. By providing the yoke in this manner, the magnetic flux of the permanent magnet 14p (14y) almost flows in the yoke 15p (15y) as in 14a, but the leakage magnetic flux is still applied to the Hall element 110p (110y).
[0183]
When the permanent magnet 14p (14y) is adjacently magnetized to the opposite pole, the change in the magnetic field at the boundary is abrupt, but the range of change is narrow, and the Hall element 110p (110y) is replaced by the permanent magnet 14p ( 14y) When it is provided in the vicinity, the detection stroke cannot be increased. (When the Hall element 110p (110y) is separated from the permanent magnet 14p (14y), the stroke increases, but the device becomes larger)
Providing the yoke 15p (15y) is equivalent to disposing the hall element 110p (110y) away from the permanent magnet 14p (14y), and the detection stroke can be expanded while the apparatus is compact.
[0184]
And, as this yoke 15p (15y), a known magnetic shunt alloy or so-photoferrite whose magnetic resistance changes with temperature can be used, so that the temperature change of the leakage magnetic flux can be reduced, and the Hall element 110p (110y) Sensitivity temperature change can be reduced. Since the temperature change of the Hall element 110p (110y) is linear and there are few solid differences, in addition to the above countermeasures, the output can be electrically corrected using a temperature sensitive element to reduce the influence of temperature.
[0185]
2) As shown in FIG. 6A, in this configuration, a permanent magnet 14p (14y) and a yoke 15 are provided between the coil 16p (16y) and the Hall element 110p (110y).
[0186]
Generally, since the Hall element is provided on the same side as the coil, the Hall element detects the magnetic field fluctuation due to the coil. However, in this configuration, the magnetic field fluctuation of the coil 16p (16y) generates a stronger magnetic field. Since it is shielded by the permanent magnet 14p (14y) and the yoke 15, it does not reach the Hall element 110p (110y). Therefore, with this configuration, the influence of the magnetic field change due to the drive current of the coil 16p (16y) does not affect the output of the Hall element 110p (110y), and the position can be detected with high accuracy.
[0187]
The specific method for assembling the shake correction apparatus described above is summarized as follows.
(A) A pair of unitized coils 16p and 16y are patched to the main plate 13.
(B) The support frame 12 to which the correction lens 11 is fitted and the yoke 15p (15y) to which the permanent magnet 14p (14y) is attracted is screwed is placed on the base plate 13, and the roller 17 is passed through the guide groove 13a. The support frame 12 and the base plate 13 are coupled to each other by screwing to 12.
(C) Screw the step motor 19 to the main plate 13.
(D) Hang the spring 18 between the hooks 12c and 13e.
(E) The hard substrate 111 (the Hall elements 110p and 110y are already provided) is screwed to the base plate 13.
(F) The terminal pins 16p and 19a are soldered to the hard substrate 111.
(G) The lock ring 113 is put on the back surface of the base plate 13, and the rolling restricting ring 112 is patched to the claw 13h (the lock ring 113 is restricted in the optical axis direction by the claw 13h together with the rolling restricting ring 112).
[0188]
Since the shake correction apparatus can be assembled by only the simple assembly process described above, the apparatus can be made highly productive and highly reliable.
[0189]
The features of the present embodiment are summarized below.
(1) Since the permanent magnets 14p and 14y are provided on the support frame (movable side) 12, wiring to the movable side becomes unnecessary, and assembly reliability is improved.
(2) By using the permanent magnets 14p and 14y as an open magnetic circuit, high-speed response of shake correction can be maintained.
(3) Since the permanent magnets 14p and 14y are provided with the yoke 15p (15y), a strong magnetic field is realized by the thin permanent magnets 14p and 14y, and the cost of the permanent magnets can be reduced.
(4) The permanent magnets 14p and 14y are attracted to the yoke 15p (15y), and the yoke 15p (15y) is attached to the support frame 12, so that troublesome bonding of the permanent magnets 14p and 14y can be omitted.
(5) The coils 16p and 16y are unitized (insert molding integrated with the coil frame and the terminal pins), so that the mounting to the base plate 13 is facilitated, and the coils 16p and 16y are securely attached to the base plate 13.
(6) Since the roller 17 and the guide groove 13a support the base plate 13 and the support frame 12, the assembly is easy and the mounting accuracy is high.
(7) By making the roller 17 an eccentric roller, the inclination of the correction lens 11 can be adjusted without providing any special inclination adjusting means.
(8) Since the fitting portions of the lock ring 113 and the support frame 12 are four points along the direction of gravity at the time of photographing, the fitting play can be reduced.
(9) Since the sensitivity axes of the Hall elements 110p and 110y, which are position detection means, and the thrust central axes of the coils 16p and 16y are matched, the position detection error due to rolling can be reduced.
(10) The rolling regulation ring 112 enables rolling regulation with a simple configuration.
(11) By rolling the tension spring 18 on the hook in the radial direction and away from the center and pulling the support frame 12, the rolling play could be absorbed elastically.
(12) By using the Hall elements 110p and 110y as position detecting means, complicated processes such as mounting of IRED and wiring can be omitted.
(13) By making the Hall elements 110p and 110y face the permanent magnets 14p and 14y via the yoke 15p (15y), the detection stroke can be increased and the size can be reduced even if the mutual gap is narrow.
(14) By using a magnetic shunt alloy as the yoke 15p (15y), the change in sensitivity temperature of the Hall elements 110p and 110y can be reduced.
(15) Since the Hall elements 110p and 110y are provided on the opposite surfaces of the coils 16p and 16y with the permanent magnets 14p and 14y sandwiched therebetween, the influence of the magnetic field fluctuation due to the coils is eliminated, and the position detection accuracy can be improved.
(16) Since the rolling regulating ring 112 is arranged on the back surface of the main plate 13, the stepping motor 19 for driving the rolling can be installed on the support frame 12 side of the main plate 13, so that the entire apparatus becomes compact.
(17) Since the coils 16p and 16y and the step motor 19 are arranged on the same surface and each terminal pin is provided in the same direction, the soldering operation when assembling the board becomes easy.
[0190]
(Second Embodiment)
FIGS. 11 to 18 are diagrams related to a shake correction apparatus according to the second embodiment of the present invention. For easy understanding, each figure schematically shows the first embodiment in FIG. FIG. 2B shows an outline of only the changed elements from the first embodiment as the second embodiment.
[0191]
Note that the shake correction apparatus including the changing elements shown in the respective drawings (b) described below is the second embodiment as described above, but this is for convenience of description, and at least one or more A device provided with a changing element is considered as a shake correction device according to the second embodiment. (In the actual explanation, for example, the example in which the configuration of the permanent magnet is changed as the changing element is referred to as the second embodiment, and the permanent magnet comes out while explaining other changing elements as the second embodiment. In this case, the configuration is described with the configuration including the permanent magnet before the change, that is, in the first embodiment.)
FIG. 11A is a diagram showing a part related to the configuration of the drive means for driving the support frame 12 (correction means) in the first embodiment, that is, the relationship between the permanent magnet 14p (14y) and the coil 16p (16y). FIG. 11B is a diagram showing the relationship between the permanent magnet 31p (31y) and the coil 16p (16y) in the second embodiment of the present invention.
[0192]
In the second embodiment, as shown in FIG. 11B, the magnetization direction of the permanent magnet 31p (31y) attached to the support frame 12 and the direction 114p (114y) of the winding center of the coil 32p (31y). ) Is orthogonal to the direction 13c of the first embodiment (see FIG. 11A). In such a configuration, by controlling the energizing direction and amount of the coil 32p, the permanent magnet 31p (31y) is attracted or repelled in the core to drive the support frame 12.
[0193]
In the case of such a system, since an empty space is created in the portion indicated by the arrow D in FIG. 11B, the above-described spring 18 or the roller 17 fitted in the guide groove can be provided. ， No need for special space for rollers, making compact.
[0194]
FIG. 12A is a side view showing the coil unit in the first embodiment, and FIGS. 12B-1 and 12B-2 show the coil unit in the second embodiment of the present invention. It is the side surface and back view which show.
[0195]
The coil 16p (16y) is the second embodiment described above. Is The coil 16p (16y) is not integrally formed with the coil frame 16a as in the first embodiment shown in FIG. 12 ( As shown in (b-1) and (b-2), for example, the coil 16p (16y) p is wound around an ABS bobbin 33a. In this method, a coil is formed simply by winding a wire rod around the bobbin 33a. As shown in FIG. 12A, the coil is wound with another tool, and then baked and bonded, and then integrally formed with the coil frame 16a. Compared with, there is a merit that it is cheaper, and there is no warpage due to aging, etc., and dimensional control can be strict.
[0196]
As shown in FIG. 12A, the bobbin 33a is provided with a pair of terminal pins 16b. After winding the wire around one of the terminal pins 16b, the bobbin 33a starts to be wound, and after the winding is finished, the other pin 16b is wound. The wire is wound around the terminal pin 16b.
[0197]
As is clear from the above, the terminal pin 16b serves as both an end presser at the beginning of coil winding, a fraying stop after the end of winding, and a connection to the hard substrate 111.
[0198]
When the bobbin 33a is viewed from the direction of the arrow 34 in FIG. 12 (b-1), a screw hole 33b is provided as shown in (b-2) and is coupled to the base plate 13 by screws. Since this screw connection can be made stronger than the patching stop of the first embodiment, there is no backlash of the coil 16p (16y) and the controllability is stabilized.
[0199]
Note that the screw is a magnetic body, and if it is attached in the vicinity of the coil, an absorbing force works between the permanent magnet of the support frame 12 and the driving accuracy may be deteriorated. However, if the distance between the two is separated to some extent (for example, 3 mm), the influence of the mutual absorption force is reduced, and the above problem is reduced by setting the mounting alignment. The above problem can also be avoided by using a non-magnetic material (such as stainless steel) for the screw.
[0200]
FIG. 13 (a) is an enlarged view of the vicinity of the guide groove (13a) in the first embodiment, and FIGS. 13 (b-1) and (b-2) are views in the second embodiment of the present invention. It is an enlarged view of the guide groove (35) vicinity, and a front view which shows the base plate and support frame which comprise this guide groove.
[0201]
The difference from the first embodiment is that the guide groove 35 is notched, and the support frame 12 is integrally formed with a roller portion 12e.
[0202]
As shown in FIG. 13 (b-2), the rim 35a and the roller portion 12e of the guide groove 35 are shifted in phase with each other, and the support frame 12 is rotated in the direction of the arrow 36, as shown in FIG. The roller part 12e is inserted from the notch part of the guide groove 35.
[0203]
In the case of this method, the operation of screwing the roller 17 into the support frame 12 can be omitted, and the mounting error between the roller 17 and the support frame 12 does not occur (for integral molding), so that the correction lens 11 can be supported with high accuracy. After the assembly, the rolling restricting ring 112 and the spring 18 restrict the rotation of the arrow 36 and the opposite direction, so that the support frame 12 does not come out of the base plate 13 again.
[0204]
FIG. 14A is a front view showing a part of the lock ring 113 and the support frame 12 in the first embodiment. 14 (B) is a front view which shows a part of lock ring 113 and the support frame 12 in the 2nd Embodiment of this invention.
[0205]
In the second embodiment, compared to the first embodiment shown in FIG. 14A, in addition to the protrusions 12b along the gravity direction (114p, 114y direction) at the time of shooting, an angle of 45 degrees with them The protrusion 12f is also provided in the direction of forming. This is because the backlash in the gravitational direction is “0.2 mm” in the first embodiment, but the backlash in the diagonal direction is to avoid the increase of √ (2) times, as shown in FIG. With such a configuration, the substantial play can be made almost the same (0.2 mm) in all directions.
[0206]
FIG. 15A is a cross-sectional view showing the positional relationship between the support frame 12, the base plate 13, and the rolling restricting ring 112 in the first embodiment, and FIGS. 15B-1 and 15B-2 show the positional relationship. It is sectional drawing which shows the positional relationship of the support frame 12, the base plate 13, and the rolling control ring 37 in 2nd Embodiment of invention.
[0207]
In the first embodiment, as shown in FIG. 15A, the shaft portion 112 a extending from the rolling restricting ring 112 passes through the long hole 13 d of the base plate 13 and enters the long hole 12 c of the support frame 12. Yes. In the case of this configuration, the rolling restricting ring 112 has a thin disk shape, and therefore, when the shaft portion 112a is provided, there is a possibility that the fall may be a problem.
[0208]
On the other hand, in the second embodiment shown in FIGS. 15 (b-1) and 15 (b-2), the shaft portion 12 g is extended from the support frame 12, and the shaft portion 12 g is formed on the base plate 13. Through the hole 13i (diameter securing the correction stroke of the support frame 12 as shown by the broken line in FIG. 15 (b-2)) and fitting into the elongated hole 37y of the rolling regulating ring 37 on the disk. Match. The shaft portion 13j of the base plate 13 is fitted in the elongated hole 37p (perpendicular to the elongated hole 37y) of the rolling regulating ring 37.
[0209]
In the above configuration, when the rolling restriction of the support frame 12 is performed, there is a demerit of providing a large hole 13i in the base plate 13. However, since the rolling restriction ring 37 can be a thin disk without a shaft portion, there is a concern about shaft collapse or the like. The processing accuracy can be increased.
[0210]
FIG. 16 (a) is a front view showing the positional relationship of the support frame 12, the base plate 13, and the spring 18 in the first embodiment, and FIG. 16 (b) is a support in the second embodiment of the present invention. It is a front view which shows the positional relationship of the frame 12, the base plate 13, and the spring 18. FIG.
[0211]
As shown in FIG. 16A, the spring 18 may be hooked not only in three directions but also in eight directions as shown in FIG. 16B.
[0212]
In the configuration of FIG. 16A, the spring force of the spring 18 is not linear with respect to the driving amount in the 114p and 114y directions (for three directions). As a result, control instability and load increase (the spring constant increases toward the end) occurs. However, when the springs are arranged in four directions as shown in FIG. 16B, the relationship between the drive amount and the spring force is Since it is linear, there is an advantage that driving can be stabilized.
[0213]
FIG. 17A is a cross-sectional view for explaining a method of attaching (electrically connecting) the terminal pin 16b to which the step motor 19 and the coil terminal are connected to the hard substrate 111 in the first embodiment. FIG. 17B is a cross-sectional view for explaining a method of attaching the terminal pin 38 to which the step motor 19 and the coil terminal are connected to the hard substrate 111 in the second embodiment of the present invention.
[0214]
In the second embodiment, as shown in FIG. 17B, the tips of the coil 16p (16y) and the terminal pin 38 of the step motor 19 are tapered, and the hard substrate 111 is attached to the shaft of the ground plane 13. When the screws 39 are screwed to 13k, the terminal pins 38 are inserted into the hard substrate 111.
[0215]
The hard board 111 has a small hole (having a smaller diameter than the diameter of the body of the terminal pin 38) in advance at the contact position, and electrical connection can be achieved when the terminal pin 38 is formed. The soldering step required between the terminal pin 16b and the hard substrate 111 in the first embodiment shown in FIG. 17A can be eliminated.
[0216]
FIG. 18A is a cross-sectional view showing the positional relationship among the Hall element 110p (110y), the yoke 15, the permanent magnet 14p (14y), and the coil 16p (16y) in the first embodiment, and FIG. -1) and (b-2) are front and cross-sectional views of the positional relationship among the Hall element 110p (110y), the yoke 310, the permanent magnet 14p (14y), and the coil 16p (16y) according to the second embodiment of the present invention. FIG.
[0217]
The position detection by the Hall element 110p (110y) can be performed only in a linear range where the magnetic field distribution is linear. In the first embodiment shown in FIG. 18A, a linear magnetic field change can be obtained only in the range 14a of the adjacent permanent magnets 14p (14y) having opposite polarities.
[0218]
In contrast, in the second embodiment shown in FIGS. 18B-1 and 18B-2, the central portion of the yoke 310 is missing. By attaching such a deformed yoke 310 to the permanent magnet 14p (14y), the distribution of the magnetic field can be changed and the detection stroke can be controlled.
[0219]
The yoke 310 may have a convex shape or a concave shape as shown in FIGS. 18C and 18D to control the magnetic field distribution.
[0220]
(Third embodiment)
FIGS. 19 to 26 are diagrams relating to a shake correction apparatus according to a third embodiment of the present invention, and show only an outline of changing elements from the first or second embodiment.
[0221]
In this embodiment as well, the shake correction apparatus including the changing elements described below is the third embodiment as described above, but this is for convenience of description, and at least one or more A device provided with a changing element is considered as a shake correction device according to the third embodiment.
[0222]
FIG. 19 is a cross-sectional view showing a part related to the driving means of the support frame 12 (correcting means) according to the third embodiment of the present invention, which corresponds to the changed part of FIGS. 11 (a) and 11 (b). .
[0223]
As in the first embodiment (see FIG. 11A), a permanent magnet 61 magnetized in the direction of the arrow 13c is provided on the support frame 12. An electromagnet 62 composed of a U-shaped core 62a and a coil 62b is disposed opposite to the permanent magnet 61. By switching the energization direction to the coil 62b, the permanent magnet 61 is attracted and repelled. The support frame 12 can be driven by the control.
[0224]
The merit of this drive method is that the support frame 12 is locked (locked) because the permanent magnet 61 is pulled by the core 62a when the coil is not energized (when no shake correction is required). Therefore, no special means (step motor 19 and lock ring 113) for locking the support frame 12 is required.
[0225]
Even when the lock ring 113 is provided to correctly position the support frame 12, there is an advantage that the lock backlash is absorbed by the attractive force of the permanent magnet 61 and the core 62 a.
[0226]
FIGS. 20 (a) and 20 (b) are views showing the side surface and the back surface of the coil unit according to the third embodiment of the present invention, which correspond to the changed portions of FIGS. 12 (a) and 12 (b). To do.
[0227]
The coil 63 is a printed coil or a laminate coil, and a terminal pin 16b is soldered to the terminal 63c of the resin base 63a. The coil 63 is screwed to the base plate 13 using a hole 63 b provided integrally with the coil 63.
[0228]
In this way, when a printed coil or a laminated coil is used as the coil, compared with the coil having the configuration in the first embodiment, the warpage of the coil is small and the dimensional control can be made strict, and as in the second embodiment. When using a bobbin, there is an advantage that the driving force can be increased because there is no need to widen the gap with the bobbin flange (0.2 mm) permanent magnet.
[0229]
FIG. 21 is a cross-sectional view showing the positional relationship between the support frame 12, the base plate 13 and the like according to the third embodiment of the present invention, and this corresponds to the changed portion of FIGS. 13 (a) and 13 (b).
[0230]
As shown in FIG. 21, a guide groove 66 is provided in the flange 67 on the support frame 12 side, and a shaft 65 fitted to the guide groove 66 is screwed into the hole 64a on the flange 64 on the base plate 13 side. You may stop it.
[0231]
In this case, it is possible to reduce the weight because it is not necessary to attach the roller to the support frame. Further, the permanent magnet 14p (14y), the coil 16p (16y), and the yoke 15p (15y) are provided on the back side of the arm portion 12a to save space. I can do it. (In the first and second embodiments, the arm portion 12a becomes thick as the roller 17 is provided on the support frame 12, and a permanent magnet or the like cannot be provided in the same direction as the arm portion 12a).
Needless to say, other members such as a spring may be provided in the same direction as the arm portion 12a.
[0232]
FIG. 22 is a front view showing the positional relationship between the support frame 12 and the lock ring 113 according to the third embodiment of the present invention, which corresponds to the changed portions of FIGS. 14 (a) and 14 (b).
[0233]
The difference from the first embodiment (see FIG. 14A) is that, as shown in FIG. 22, a projection 113d is provided on the lock ring 113 side, and a cam 12g is provided on the support frame 12 side. It is.
[0234]
The lock ring 113 is a thin ring. When the cam 113d is provided on the lock ring 113 side as shown in FIG. 14A, the thickness of the portion is further reduced, which may cause deformation. Since the correction lens is fitted on the support frame 12 side, deformation does not occur during use even if the wall thickness is somewhat thin. Therefore, the component rigidity can be increased in the configuration of FIG.
[0235]
FIG. 23 is a cross-sectional view showing the positional relationship among the support frame 12, the base plate 13, and the rolling restricting ring 37 according to the third embodiment of the present invention. This is a modified part of FIGS. 15 (a) and 15 (b). Equivalent to.
[0236]
The rolling restriction ring 37 is sandwiched between the support frame 12 and the fixed frame 69, and a smooth shaft 68 of metal is fixed. Since the shaft 68 is sandwiched and supported by the support frame 12 and the fixed frame 69, the shaft can be prevented from falling (the shaft 68 falling relative to the support shaft 12). Further, since the shaft 68 is a smooth metal pin, the friction between the shaft 68 and the hole 37y is extremely small.
[0237]
Here, the fact that the friction between the shaft 68 and the hole 37y is concerned will be described.
[0238]
In general, when the direction of gravity when shooting with a camera is 610, the support frame 12 is controlled by a coil and a magnet against gravity. At this time, since the rolling restricting ring 37 is also pulled in the direction of gravity 610, the weight of the rolling restricting ring 37 is applied to the shaft 68. Therefore, since the vertical drag between the shaft 68 and the long hole 37y is larger than the drag between the long hole 37p and the shaft 13j, the friction is increased only in this direction, and the driving accuracy is deteriorated.
[0239]
For this reason, the shaft 68 is used as a metal pin to improve sliding with the long hole 37y. Further, since the shaft 68 is sandwiched between the support frame 12 and the fixed frame 69, the bending in the rolling direction is reduced, and the regulation accuracy in this direction can be increased.
[0240]
FIG. 24 is a front view showing the positional relationship between the support frame 12, the base plate 13, and the spring 18 according to the third embodiment of the present invention, and this corresponds to the changed portion of FIGS. 16 (a) and (b). .
[0241]
The difference from the first embodiment (see FIG. 16A) is that the spring 18 is spirally hung as shown in FIG. Therefore, the support frame 12 receives a rotational force in the direction of the arrow 611. However, since the rolling direction of the support frame 12 is suppressed by the rolling restricting ring 112 (not shown), it does not rotate in the arrow 611 direction.
[0242]
In the case of such a configuration, minute fitting backlash between the rolling regulation ring 112 and the base plate 13 and between the rolling regulation ring 112 and the support frame 12 is absorbed by being precharged by the rotational force of the spring 18 in the arrow 611 direction. Therefore, it is possible to make a shake correction device without rolling play.
[0243]
Needless to say, the number of springs 18 is not limited to three as shown in the figure, but may be four as shown in FIG.
[0244]
FIG. 25 is a cross-sectional view for explaining a method for attaching (electrically connecting) the terminal pins connected to the step motor 19 and the coil terminals to the hard substrate 111 in the third embodiment of the present invention. Corresponds to the changed portion of FIGS. 17 (a) and 17 (b).
[0245]
The step motor 19 is attached to the hard board 111 in advance, and the soldering operation is completed. The step motor 19 is not coupled to the base plate 13 with screws or the like. (The base plate 13 only guides the position of the step motor 19)
As described above, when the step motor 19 is attached in advance to the hard substrate 111 side and unitized, the operation of attaching the step motor 19 to the main plate 13 and the operation of soldering the hard substrate 111 and the terminal 19a of the step motor 19 are the main operations. It can be omitted from the assembly process. Therefore, the assembly process is further simplified and the reliability is improved.
[0246]
Note that the terminal pin 38 connected to the coil terminal of the coil 16p (16y) has a tapered tip as in the second embodiment (see FIG. 17B). Can be electrically connected to the shaft 13k of the base plate 13 with a screw 39.
[0247]
26 is a cross-sectional view showing the positional relationship among the Hall element 110p (110y), the yoke 310, the permanent magnet 14p (14y), and the coil 16p (16y) in the third embodiment of the present invention.
[0248]
In the third embodiment, the Hall element 110p (110y) is provided at the end of the yoke 15p (15y) as shown in FIG.
[0249]
In the case of the first embodiment (see FIG. 18 (a)), the magnetic field changes drastically in the adjacent portion of the two poles, and the sensitivity can be increased, but the magnetic field change cannot be made linear over a long stroke. The range of linear output in the detection stroke is limited.
[0250]
On the other hand, in the case of the configuration as shown in FIG. For this reason, the linear range of change in the magnetic field is widened, and the range in which linear output can be obtained can be widened.
[0251]
According to each embodiment described above, the following effects are obtained.
(1) Since the permanent magnet is provided on the support frame (movable side), wiring to the movable side becomes unnecessary, and the assembly reliability is improved.
(2) High-speed response was secured by using an open magnetic circuit for the permanent magnet.
(3) By providing the yoke on the permanent magnet, a strong magnetic field was realized with a thin permanent magnet, and the cost of the permanent magnet could be reduced.
(4) The permanent magnet is attracted to the yoke, and the yoke is attached to the support frame, so that troublesome adhesion of the permanent magnet can be omitted.
(5) Since the coil winding center is aligned in the driving direction, and the permanent magnet is attracted and repelled, the coil can be used effectively for other members (for example, support rollers). Made compact.
(6) Since the permanent magnet of the support frame is driven by attracting and repelling with the electromagnet on the ground plane side, the support frame can be locked with the mutual attractive force when not in use, and the locking means can be omitted. Furthermore, I was able to eliminate the rock play.
(7) The coil has become a unitized frame and terminal pin integrated insert molding, which makes it easy to attach to the ground plane.
(8) The coil can be wound around the bobbin, thereby reducing costs and strict dimensional control.
(9) By making the coil a printed coil or a laminated coil, the gap with the permanent magnet can be reduced (because there is no warping or undulation of the coil), and the driving force can be increased.
[0252]
Furthermore, it has the following effects.
(10) Since the base plate and the support frame are supported by the rollers and the guide grooves, the assembly is easy and the mounting accuracy is high.
(11) By making the roller an eccentric roller, the inclination of the correction lens can be adjusted without providing any special inclination adjusting means, and the entire apparatus can be made compact.
(12) Since the notch is provided in the indoor groove, the mounting of the support frame to the base plate is further facilitated, and the roller can be integrated with the support frame, so that the dimensional accuracy can be strict.
(13) By providing an indoor groove on the support frame side, the support frame can be reduced in weight (because it is not necessary to attach a roller), and the periphery of the guide groove can be effectively used for other members (for example, permanent magnets), making it compact. It was.
(14) The engagement play between the lock ring and the support frame can be made small by using four points along the direction of gravity during photographing.
(15) By providing fitting portions between the lock ring and the support frame along the gravitational direction during shooting and the 45 deg direction, fitting play in all directions can be reduced.
(16) By providing the fitting protrusion on the lock ring side, the part rigidity can be increased.
(17) By making the sensitivity axis of the position detection sensor coincide with the thrust central axis of the coil, the position detection error due to rolling can be reduced.
(18) By arranging the rolling regulating ring on the back surface of the main plate, another member (step motor) can be installed on the support frame side of the main plate, and the entire apparatus is compact.
(19) The rolling restricting ring has a thin disk shape, and a method in which the pins from the support frame and the base plate are fitted to achieve compactness and high rigidity.
(20) Pins from the support frame that fit into the rolling restricting ring are metal pins, and by connecting the tip of each pin to each other, the pin can be tilted and bent more rigidly, and the restricting force in the rolling direction is increased. done. Also, by using a metal pin, the frictional force with the long hole can be reduced.
[0253]
Furthermore, it has the following effects.
(21) The rolling play could be elastically absorbed by hooking the tension spring on the hook in the radial direction and away from the center and pulling the support frame.
(22) By using a tension spring as a cross, the change in spring force could be made linear.
(23) It was possible to eliminate rolling play by arranging the spring force of the tension spring in the rolling direction and precharging the regulating force of the rolling regulating ring.
(24) Since the coil and the step motor are arranged on the same surface and each terminal pin is provided in the same direction, the soldering work when mounting the hard board becomes easy.
(25) The tip of the terminal pin of the coil and the step motor is scraped and sunk into the hard board, thereby eliminating the soldering work.
(26) By attaching the stepping motor to the hard board in advance and soldering, the troublesome work for that is omitted from the main assembly process, and the production capacity is improved.
(27) By using a Hall element as the position detection sensor, complicated processes such as IRED mounting and wiring can be omitted.
(28) By making the Hall element face the permanent magnet through the yoke, the detection stroke can be increased even if the gap between each other is narrow.
(29) By making the yoke differently shaped, the distribution of the magnetic field can be controlled and the detection linearity range of the Hall element can be widened.
(30) The linearity range can be widened by installing the Hall element at a position where the end magnetic field of the permanent magnet is detected.
(32) By using a magnetic shunt alloy as the yoke, the temperature change in the sensitivity of the Hall element can be moderated.
(33) By providing the Hall element and the coil on the opposite surface sandwiching the permanent magnet, the influence of the magnetic field fluctuation due to the coil energization can be eliminated and the position detection accuracy can be improved.
[0254]
(Modification)
The present invention is suitable for a photographing apparatus such as a single-lens reflex camera or a video camera, but is not limited thereto, and is applied to an optical apparatus that exhibits an effective function by including a vibration isolation system. Is also possible. In addition, when applied to an imaging apparatus as described above, shake correction can be performed in the same manner even in a configuration including an imaging element such as a CCD instead of the correction lens in each of the above embodiments. Needless to say.
[0255]
【The invention's effect】
As explained above, The present invention According to Assembling of the shake correction device can be simplified, and the reliability of shake correction can be improved. .
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing main components of a shake correction apparatus according to a first embodiment of the present invention.
2 is a front view showing the shake correction apparatus of FIG. 1 with a hard substrate removed. FIG.
3 is a diagram showing an internal configuration of a side surface and main parts from the direction of arrow A in FIG. 2;
4 is a cross-sectional view taken along the line BB ′ of FIG.
FIG. 5 is a diagram showing a configuration of a coil unit according to the first embodiment of the present invention.
FIG. 6 is a cross-sectional view for explaining the configuration of a shake correction driving unit according to the first embodiment of the present invention by comparison with a conventional configuration.
FIG. 7 is a front view showing a hard substrate in the first embodiment of the present invention.
FIG. 8 is a diagram showing a support frame and a ground plane in the first embodiment of the present invention from the back side of FIG. 2;
FIG. 9 is a diagram showing a lock ring and a rolling restricting ring according to the first embodiment of the present invention.
FIG. 10 is a front view for explaining the configuration of the means for locking the correcting means in the first embodiment of the present invention by comparison with the conventional configuration.
FIG. 11 is a cross-sectional view for explaining the configuration of a shake correction drive unit according to the second embodiment of the present invention by comparison with the configuration according to the first embodiment.
FIG. 12 is a diagram for explaining the configuration of a coil unit according to a second embodiment of the present invention by comparison with the first embodiment.
FIG. 13 is a diagram for explaining the positional relationship between a support frame and a ground plane in a second embodiment of the present invention by comparison with the first embodiment.
FIG. 14 is a front view for explaining the configuration of the means for locking the correction means in the second embodiment of the present invention by comparison with the first embodiment.
FIG. 15 is a diagram for explaining the positional relationship among a support frame, a ground plane, and a rolling restricting ring according to a second embodiment of the present invention by comparison with the first embodiment.
FIG. 16 is a front view for explaining the positional relationship among the support frame, the ground plane, and the spring in the second embodiment of the present invention by comparison with the first embodiment.
FIG. 17 is a cross-sectional view for explaining a method of attaching a step motor or the like to a hard board in the second embodiment of the present invention by comparison with the first embodiment.
FIG. 18 is a cross-sectional view for explaining the configuration of the means for detecting the position of the correcting means in the second embodiment of the present invention by comparison with the first embodiment.
FIG. 19 is a cross-sectional view showing a configuration of shake correction drive means according to the third embodiment of the present invention.
FIG. 20 is a diagram showing a configuration of a coil unit according to a third embodiment of the present invention.
FIG. 21 is a cross-sectional view showing a positional relationship between a support frame and a ground plane in a third embodiment of the present invention.
FIG. 22 is a front view showing a positional relationship between a support frame and a lock ring according to a third embodiment of the present invention.
FIG. 23 is a cross-sectional view showing a positional relationship among a support frame, a main plate, and a rolling restricting ring according to a third embodiment of the present invention.
FIG. 24 is a front view showing a positional relationship among a support frame, a ground plane, and a spring in the third embodiment of the present invention.
FIG. 25 is a cross-sectional view for explaining a method of attaching a step motor or the like to a hard board in the third embodiment of the present invention.
FIG. 26 is a cross-sectional view for explaining the configuration of the means for detecting the position of the correcting means in the third embodiment of the present invention by comparison with the first embodiment.
FIG. 27 is a perspective view showing a schematic configuration of a conventional vibration isolation system.
28 is an exploded perspective view showing the structure of the shake correction device of FIG. 27. FIG.
29 is a view for explaining the shape of the hole of the support frame into which the holding means of FIG. 28 is inserted.
30 is a cross-sectional view showing a state when a support frame is incorporated in the main plate of FIG.
31 is a perspective view showing the main plate shown in FIG. 28. FIG.
32 is a perspective view showing the support frame shown in FIG. 28. FIG.
33 is a perspective view showing the lock ring shown in FIG. 28. FIG.
34 is a front view showing the support frame and the like of FIG. 28. FIG.
35 is a circuit diagram showing a configuration of an IC that amplifies the output of the position detection element of FIG. 28;
FIG. 36 is a diagram showing a state when the lock ring of FIG. 28 is driven.
FIG. 37 is a diagram showing signal waveforms when the lock ring is driven in FIG. 36;
FIG. 38 is a block diagram showing a part of a circuit configuration of an image stabilization system of a camera equipped with an image stabilization system.
FIG. 39 is a block diagram showing the remaining part of the circuit configuration of the image stabilization system of the camera equipped with the image stabilization system.
40 is a flowchart showing a schematic operation of the camera in the circuit configuration of FIGS. 27 and 28. FIG.
[Explanation of symbols]
11 Correction lens
12 Support frame
13 Ground plane
13a Guide groove
14p, 14y permanent magnet
15p, 15y yoke
16b terminal pin
16c Locating pin
16d nails
16p, 16y coil
18 Spring
111 Hard substrate
112 Rolling restriction ring
113 Lock ring

Claims (1)

A correction means for correcting a shake , comprising a permanent magnet on a component surface;
Support means for supporting the correction means , comprising a correction drive coil for driving the correction means on the first surface facing the permanent magnet ;
Wherein the first surface of the supporting means provided opposite to the second surface opposite to a stabilizing device comprising a locking means for rotation locking said correction means,
A locking driving coil for driving the locking means is disposed on the first surface of the support means ,
A printed circuit board on which a position detection unit for detecting the movement of the correction unit is mounted on the printed surface is arranged in connection with the support unit on the opposite side across the correction unit ,
The shake correction apparatus according to claim 1, wherein pin terminals of the correction drive coil and the locking drive coil are extended and connected to the print surface .

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