JPH0961876A - Correction optics - Google Patents

Abstract

(57) Abstract: It is possible to stably lock a correction means even with an elastic means having a weak elastic force. SOLUTION: A correcting means 75 for eccentricizing an optical axis, a locking means having a locking portion 719 for locking the correcting means, and an elastic means 72 for urging the locking portion in a locking direction of the correcting means.
8, the correction means is locked by the resultant force of the inertial force of the locking portion locking the correction means and the elastic force of the elastic means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to correction optics provided in a vibration control device for detecting a vibration such as a camera shake generated in an optical device such as a camera and suppressing an image shake caused by the vibration based on the vibration. It relates to an improvement of the device.

[0002]

2. Description of the Related Art In a current camera, all operations important for photographing, such as exposure determination and focusing, are automated, so that even an inexperienced person in camera operation is very unlikely to fail in photographing.

In recent years, a system for preventing a camera shake from being applied to a camera has been studied, and a factor which causes a photographer to fail in photographing has almost disappeared.

Here, a system for preventing camera shake will be briefly described.

The camera shake at the time of photographing is generally a vibration of 1 Hz to 12 Hz as a frequency. At the time of release of the shutter, even if such camera shake occurs, it is possible to take a picture without image shake. As a basic idea, it is necessary to detect the camera shake caused by the camera shake and to displace the correction lens according to the detected value. Therefore, in order to achieve the ability to take a picture without causing image shake even if camera shake occurs, first, it is necessary to accurately detect the camera vibration and secondly correct the optical axis change due to camera shake. Will be needed.

In principle, this vibration (camera shake) is detected by means of vibration detecting means for detecting angular acceleration, angular velocity, angular displacement, etc., and by integrating the output signal of the sensor electrically or mechanically. The camera shake detecting means for outputting the angular displacement can be mounted on the camera. And
By driving the correction optical device that decenters the photographing optical axis based on this detection information, image blur can be suppressed.

Here, an outline of an anti-vibration system using the vibration detecting means will be described with reference to FIG.

FIG. 6 shows an example of a system for suppressing an image blur caused by a camera vertical shake 81p and a horizontal shake 81y in a direction indicated by an arrow 81.

In the figure, reference numeral 82 denotes a lens barrel, 83p, 83
y is a vibration detecting means for detecting a camera vertical vibration and a camera horizontal vibration, respectively.
This is indicated by 84y. 85 is a correction optical device (86p, 8
6y is a coil for applying a thrust to the correction optical device 85, 8
Reference numerals 6p and 86y denote position detecting elements for detecting the position of the correction optical device 85. The correction optical device 85 is provided with a position control loop described later, and the vibration detection means 83p and 83y are provided.
It is driven with the output of y as the target value, and the stability on the image plane 88 is secured.

FIG. 7 is an exploded perspective view showing the structure of a correction optical device which is preferably used for this purpose. This structure will be described below with reference to FIGS. 8 to 16.

The rear protruding ears 71a [3 places (1 place is hidden and not visible)] of the main plate 71 (enlarged view in FIG. 10) are fitted to a lens barrel (not shown), and a known lens barrel roller or the like is bored. It is screwed to 71b and fixed to the lens barrel.

The second yoke 72, which is a magnetic material and has been subjected to selective plating, is provided with a screw penetrating the hole 72a to form a hole 7 in the main plate 71.
1c. The second yoke 72 has a permanent magnet (shift magnet) 7 such as a neodymium magnet.
3 are magnetically attracted. The magnetization direction of each permanent magnet 73 is the direction of the arrow 73a shown in FIG.

Coils 76p, 76 are provided on a support frame 75 (enlarged view in FIG. 11) to which a lens 74 is fixed by a C ring or the like.
y (shift coil) is patch-bonded (meaning a state in which it is forcedly pushed and bonded) (FIG. 11 is not bonded), and the light projecting elements 77p and 77y such as IRED are also attached to the back surface of the support frame 75. Bonded and slits 75ap, 75ay
The emitted light is incident on the position detection elements 78p and 78y such as PSD described later through.

In the holes 75b (three places) of the support frame 75, PO
Support ball 79 with a spherical tip such as M (polyacetal resin)
a and 79b and the charge spring 710 are inserted (see also FIG. 8 and FIG. 9), and the support ball 79a is thermally caulked and fixed to the support frame 75 (the support ball 79b opposes the spring force of the charge spring 710 and the hole 75b. Is slidable in the extending direction).

FIG. 8 is a transverse cross-sectional view of the correction optical device after assembly, in which the support ball 79b, the charged charge spring 710, and the support ball 79a are sequentially inserted into the hole 75b of the support frame 75 in the direction of arrow 79c. (The supporting balls 79a and 79b are parts having the same shape.) Finally, the peripheral end portion 75c of the hole 75b is thermally caulked to prevent the supporting ball 79a from coming off.

A sectional view of the hole 75b in a direction orthogonal to FIG. 8 is shown in FIG. 9 (a), and the sectional view of FIG. 9 (a) is indicated by an arrow 79c.
A plan view seen from the direction is shown in FIG.
The depth of the range shown by the symbols A to D in FIG.
~ D.

Here, since the rear end of the wing portion 79aa of the supporting ball 79a is received and regulated in the range of the depth A, the supporting ball 79a is thermally caulked at the peripheral end portion 75a so that the supporting ball 79a is supported by the supporting frame 75.
Fixed to.

Since the tip of the blade 79ba of the support ball 79b is received in the range of the depth B plane, the support ball 79b comes out of the hole 75b in the direction of the arrow 79c by the charge spring force of the charge spring 710. Nothing.

Of course, when the correction means is assembled, the support ball 7
9b is received by the second yoke 72 as shown in FIG.
Although it does not come out of the support frame 75, the disengagement prevention area B surface is provided in consideration of the assemblability.

The holes 75b of the support frame 75 shown in FIGS.
The shape of does not require a complicated inner diameter slide die even when the support frame 75 is formed by molding, and can be formed by a simple two-division die in which the die is removed on the side opposite to the arrow 79c, so that the dimensional accuracy can be improved accordingly. Can be set strictly.

As described above, since the support balls 79a and 79b are the same part, not only the cost of parts is reduced, but also
There are no assembly mistakes and it is advantageous in parts management.

The bearing portion 75d of the support frame 75 is coated with, for example, fluorine-based grease, and an L-shaped shaft 711 is applied thereto.
(Non-magnetic stainless steel) (see FIG. 7), and the other end of the L-shaped shaft 711 is a bearing 71 d formed on the base plate 71.
(Grease is applied in the same manner), and three supporting balls 7
9b is placed on the second yoke 72, and the support frame 75 is
Put it in 1.

Next, the positioning holes 712a (3 places) of the first yoke 712 shown in FIG. 7 are fitted to the pins 71f (3 places) of the main plate 71 shown in FIG. 10, and the receiving surface 71e (also shown in FIG. 10). The first yoke 712 is received at five locations and magnetically coupled to the base plate 71 (by the magnetic force of the permanent magnet 73).

As a result, the back surface of the first yoke 712 comes into contact with the support ball 79a, and as shown in FIG.
It is sandwiched between the yoke 712 and the second yoke 72 to perform positioning in the optical axis direction.

Support balls 79a, 79b and first yoke 71
2. Fluoro-based grease is also applied to the contact surfaces of the second yoke 72 with each other, and the support frame 75 is freely slidable with respect to the base plate 71 in a plane orthogonal to the optical axis.

The L-shaped shaft 711 is supported by the support frame 75 and the base plate 71.
On the other hand, it means that it is slidably supported only in the directions of arrows 713p and 713y, whereby the base plate 7 of the support frame 75 is supported.
Relative rotation (rolling) around the optical axis with respect to 1 is regulated.

The L-shaped shaft 711 and the bearings 71d, 7d
The fitting backlash of 5d is set to be large in the optical axis direction, and the support balls 79a and 79b, the first yoke 712, and the second yoke 7 are provided.
This prevents overlapping with the optical axis direction regulation due to the clamping of 2.

An insulating sheet 714 is covered on the surface of the first yoke 712, and a hard substrate 715 having a plurality of ICs thereon (position detecting elements 78p, 78y, output amplifying ICs, coils 76p, 76y for driving). ICs) are fitted in the positioning holes 715a (two places) to the pins 71h (two places) shown in FIG. 10 of the main plate 71, and are screwed to the holes 715b, the holes 712b of the first yoke 712, and the holes 71g of the main plate 71. It

Here, the position detecting elements 78p and 78y are positioned on the hard substrate 715 by a tool and soldered, and the flexible substrate 716 for signal transmission is also provided on the surface 716.
a is a range 715c surrounded by a broken line on the back surface of the hard substrate 715
(See FIG. 7).

A pair of arms 716 bp and 716 by extend from the flexible substrate 716 in a plane direction orthogonal to the optical axis, and hook portions 75 ep and 7 ep of the support frame 75 respectively.
5ey (see FIG. 11), and the light emitting element 77
The terminals p and 77y and the terminals of the coils 76p and 76y are soldered.

Thus, the light emitting element 77 such as an IRED
The driving of p, 77y and the coils 76p, 76y is performed from the hard substrate 715 via the flexible substrate 716.

The arm 716 of the flexible substrate 716
bp and 716by (see FIG. 7) have refraction portions 716c, respectively.
p, 716 cy, and the elasticity of the refraction reduces the load on the arms 716 bp, 716 by when the support frame 75 moves around in a plane perpendicular to the optical axis.

The first yoke 712 has a projecting surface 712c formed by die cutting, and the projecting surface 712c is
4 through the hole 714a and is in direct contact with the hard substrate 715. A ground (GND: ground) pattern is formed on the hard board 715 side of this contact surface, and the first yoke 71 is screwed to the ground board to connect the hard board 715 to the ground plate.
Numeral 2 is grounded to prevent an antenna from giving noise to the hard substrate 715.

The mask 717 shown in FIG. 7 is positioned on the pins 71h of the base plate 71, and is fixed on the hard substrate 715 with a double-sided tape.

The base plate 71 has a permanent magnet through hole 71i.
(See FIGS. 7 and 10) are opened, and the second
The back surface of the yoke 72 is exposed. The permanent magnet 718 (locking magnet) is incorporated in the through hole 71i, and is magnetically coupled to the second yoke 72 (see FIG. 8).

Lock ring 719 (FIGS. 7, 8, and 12)
(Refer to FIG. 13), the coil 720 (locking coil) is bonded, and the bearing 719b (see FIG. 13) is provided on the back surface of the ear 719a of the lock ring 719.
1 (see FIG. 7), the armature rubber 722 is passed through, the armature pin 721 is passed through the bearing 719b, and then the armature spring 723 is passed through the armature pin 721, and the armature 724 is fitted and fixed by caulking.

Therefore, the armature 724 opposes the charging force of the armature spring 723 and acts on the lock ring 71.
9 can slide in the direction of arrow 725.

FIG. 13 is a plan view of the correction means after the assembly is completed, as viewed from the rear side of FIG. 7. In this figure, the outer diameter cutouts 719c (3 places) of the lock ring 719 are connected to the inner diameter of the main plate 71. The lock ring 719 is attached to the main plate 71 by a known bayonet connection in which the lock ring 719 is pushed into the main plate 71 in accordance with the projections 71j (three places), and then the lock ring is rotated clockwise to prevent the lock ring from coming off.

Accordingly, the lock ring 719 is rotatable around the optical axis with respect to the main plate 71. However, the lock ring 719 rotates, and the notch 719 c again
j to prevent the bayonet connection from coming off, a lock rubber 726 (see FIGS. 7 and 13) is pressed into the main plate 71, and the lock ring 719 is
The angle θ of the notch 719d regulated by the angle 26 (see FIG. 13)
(See Reference).

A permanent magnet 718 (locking magnet) is also attached to the magnetic yoke 727 (see FIG. 7), and its holes 727a (two locations) are fitted to pins 71k (see FIG. 13) of the main plate 71. And fit into the hole 727b
(2 places) and 71n (2 places).

The permanent magnet 718 on the base plate 71 side, the permanent magnet 718 on the locking yoke 727 side, and the second yoke 7
2. A known closed magnetic path is formed by the locking yoke 727.

The lock rubber 726 is prevented from coming off by the screw connection of the locking yoke 727. In FIG. 13, the lock yoke 727 is omitted for the above description.

The hook 719e of the lock ring 719
A lock spring 728 is hung between the hook 71m of the base plate 71 and the hook 71m (see FIG. 13), and urges the lock ring 719 clockwise. The suction coil 730 is inserted into the suction yoke 729 (see FIGS. 7 and 13), and
It is screwed together by one hole 729a.

Terminal of Coil 720 and Adsorption Coil 730
The terminal of the flexible substrate 716 has a twisted pair configuration of, for example, a four-stranded tetron covered wire.
Soldered to d.

The IC 731p on the hard substrate 715,
731y is an IC for amplifying the output of the position detection terminals 78p and 78y, respectively. The internal configuration is as shown in FIG. 20 (since the ICs 731p and 731y have the same configuration, only 731p is shown here).

In FIG. 14, the current-voltage conversion amplifier 7
31 ap and 731 bp convert the photocurrents 78i1p and 78i2p generated in the position detecting element 78p (consisting of the resistors R1 and R2) by the light projecting element 77p into a voltage, and the differential amplifier 7
31cp is each current-voltage conversion amplifier 731ap, 731
The difference output of bp is obtained and amplified.

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 as described above, but the support frame 75 is in a plane perpendicular to the optical axis. When moved, the position detecting element 78p,
The position of incidence on 78y changes.

The position detecting element 78p has sensitivity in the direction of the arrow 78ap (see FIG. 7), and also has a slit 75a.
Since p has a shape in which the light beam spreads in a direction (78ay direction) orthogonal to the arrow 78ap and the light beam is narrowed in the direction of the arrow 78ap, the position detecting element is only used when the support frame 75 moves in the arrow 713p direction. 78p photocurrent 78i ₁ p, 7
The balance of 8i ₂ p changes, and the differential amplifier 731cp outputs according to the direction of the arrow 713p of the support frame 75.

The position detecting element 78y has detection sensitivity in the direction of arrow 78ay (see FIG. 7), and the slit 75ay has a shape extending in the direction (78ap direction) orthogonal to the arrow 78ay. The position detection element 78y changes the output only when it moves in the direction of the arrow 713y.

The addition amplifier 731dp obtains the sum of the outputs of the current-voltage conversion amplifiers 731ap and 731bp (total light receiving amount of the position detecting element 78p), and the driving amplifier 731ep receiving this signal drives the light projecting element 77p accordingly.

Since the light emitting quantity of the light emitting element 77p changes extremely unstable with temperature or the like, the absolute amount (78i) of the photocurrents 78i ₁ p and 78i ₁ p of the position detecting element 78p is accordingly changed.
i ₁ p + 78i ₂ p) changes. Therefore, the support frame 75
The output of the differential amplifier 731cp a showing the position _{(78i 1 p-78i 2 p} ) also changes.

However, if the light emitting element 77p is controlled by the aforementioned driving circuit so that the total amount of received light is constant as described above, the output of the differential amplifier 731cp does not change.

The coils 76p and 76y shown in FIG. 7 are located in a closed magnetic circuit formed by the permanent magnet 73, the first yoke 712 and the second yoke 72, and the support frame 75 is formed by passing a current through the coil 76p. The support frame 75 is driven in the arrow 713p direction (known Fleming's left-hand rule), and the support frame 75 is driven in the arrow 713y direction by passing a current through the coil 76y.

Generally, when the outputs of the position detecting 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 detecting elements 78p and 78y change. Becomes

Here, when the driving direction (polarity) of the coils 76p and 76y is set so that the output of the position detecting elements 78p and 78y becomes smaller (negative feedback), the coils 76p and 76y are turned off.
The support frame 75 is stabilized at a position where the outputs of the position detecting elements 78p and 78y become substantially zero by the driving force of 6y.

The method of performing driving by negatively feeding back the position detection output in this manner is called a position control method. For example, when a target value (for example, a shake angle signal) is externally mixed with the ICs 731p and 731y, the support frame 75 moves to the target position. It is driven very faithfully according to the value.

Actually, the differential amplifiers 731cp and 731c
The output of y is sent to the main substrate (not shown) via the flexible substrate 716, where analog-digital conversion (A / D conversion) is performed and the result is captured by the microcomputer.

In the microcomputer, the target value (camera shake angle signal) is appropriately compared and amplified, and phase advance compensation (to stabilize the position control) is performed by a known digital filter method, and then the flexible board 716 is passed again. IC7
32 (for driving the coils 76p and 76y). IC
732 indicates the coils 76p and 76 based on the input signal.
y is driven by a known PWM (pulse width modulation) to drive the support frame 75.

As described above, the support frame 75 has the arrow 713p,
It is slidable in the 713y direction, and the position is stabilized by the position control method described above. However, in consumer optical devices such as cameras, the support frame 75 is always controlled from the viewpoint of preventing power consumption. I can't keep it.

Further, since the support frame 75 can freely move around in the plane orthogonal to the optical axis in the non-controlled state, countermeasures against the sound generation and damage of the collision at the stroke end at that time are taken. You need to do it.

As shown in FIGS. 11 and 13, on the back surface of the support frame 75, three radially projecting projections 75f are provided. As shown in FIG. 13, the tips of the projections 75f are the inner circumference of the lock ring 719. It is fitted to the surface 719g. Therefore, the support frame 75 is restrained in all directions with respect to the main plate 71.

The lock ring 71 is shown in FIGS.
9 is a plan view showing the relationship between the operation of the support frame 9 and the support frame 75.
FIG. 3 is a diagram in which only essential parts are extracted from the plan view of FIG. Note that the layout is slightly changed from the actual assembled state to make the description easy to understand. Also, the cam portion 719f of FIG.
As shown in FIGS. 8 and 12, the (three places) are not provided over the entire area of the lock ring 719 in the generatrix direction of the cylinder, so that they cannot actually be seen from the direction of FIG.
It is shown for explanation.

As shown in FIG. 8, the coil 720 (720
a is a not-shown flexible substrate or the like and a lock ring 71.
9, the flexible substrate 7 from the terminal 719h.
The four-stranded wire connected to the terminal 716 e on the stem 716 d of the sixteen is in a closed magnetic path sandwiched by permanent magnets 718, and the current flows through the coil 720 to cause the lock ring 719 to move the optical axis. Generates torque to rotate around.

The coil 720 is also driven by the microcomputer (not shown) via the flexible substrate 716 and the hard substrate 71.
5 is controlled by a command signal input to the driving IC 733 on the IC 5, and the IC 733 performs PWM driving of the coil 720.

In FIG. 15A, the winding direction of the coil 720 is set so that a counterclockwise torque is generated in the lock ring 719 when the coil 720 is energized.
Accordingly, the lock ring 719 rotates counterclockwise against the spring force of the lock spring 728.

The lock ring 719 has a coil 720
Before power is supplied to the lock rubber 72, the force of the lock spring 728 is used.
6 and stable.

When the lock ring 719 rotates, the armature 724 comes into contact with the suction yoke 729 to contract the armature spring 723 and equalize the positional relationship between the suction yoke 729 and the armature 724 to lock the lock ring 719.
Stops the rotation as shown in FIG.

FIG. 16 is a timing chart of the lock ring drive.

The coil 720 is energized (PWM drive indicated by 720b) at the same time as the arrow 719i in FIG. 16 and at the same time the energization magnet 730 is energized (730a). Therefore, the armature 724 comes into contact with the suction yoke 729 and, when equalized, the armature 724 is moved to the suction yoke 729.
Is adsorbed on.

Next, when the coil 720 is de-energized at the time indicated by 720c in FIG. 16, the lock ring 719 tries to rotate clockwise by the force of the lock spring 728.
Since the armature 724 is adsorbed by the adsorption yoke 729 as described above, the rotation is restricted. At this time, since the protrusion 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 be moved by the clearance between the protrusion 75f and the cam portion 719f. become.

For this reason, the support frame 75 falls in the direction of gravity G [see FIG. 15 (b)].
Since the support frame 75 is also in the control state at the time of 19i, it does not fall.

When the support frame 75 is not controlled, the lock ring 71
9, but actually has a play corresponding to the fitting play between the projection 75f and the inner peripheral wall 719g. That is, the support frame 75 falls in the direction of gravity G by this amount of backlash, and the center of the support frame 75 and the center of the main plate 71 are displaced.

Therefore, from the time point of arrow 719i, for example, 1
It takes a second to slowly move to the center of the base plate 71 (center of the optical axis).

When this is moved to the center abruptly, the lens 7
This is because the photographer feels the image shake through 4 and is uncomfortable, and even if exposure is performed during this period, the image deterioration due to the movement of the support frame 75 does not occur. (Eg 1/8
(The support frame is moved by 5 μm in seconds.) Specifically, the outputs of the position detection elements 78p and 78y at the time point of arrow 719i in FIG. 16 are stored, the control of the support frame 75 is started with the value as a target value, and then the second frame is spent for 1 second. And moves to a target value when the center of the optical axis is preset (see 75g in FIG. 16).

After the lock ring 719 is rotated (unlocked state), based on the target value from the vibration detecting means (overlapped with the center position moving operation of the support frame 75 described above).
The support frame 75 is driven, and the image stabilization starts.

Here, when the image stabilization is turned off at the time of arrow 719j to end the image stabilization, the target value from the vibration detection means is not input to the correction means, and the support frame 75 is controlled to the center position and stops. At this time, the power supply to the attraction coil 730 is stopped (730b). Then, the attraction force of the armature 724 by the attraction yoke 729 disappears, and the lock ring 719 is rotated clockwise by the lock spring 728 to return to the state of FIG. At this time, the lock ring 719 is in contact with the lock rubber 726 and its rotation is restricted, so that the collision sound of the lock ring 719 at the end of the rotation can be suppressed small.

After that (for example, after 20 msec), the control of the correction means is cut off, and the timing chart of FIG. 16 ends.

FIG. 17 is a block diagram showing the outline of the image stabilization system.

In FIG. 17, reference numeral 91 denotes the vibration detecting means 83p and 83y shown in FIG. 6, which is a shake detection sensor for detecting an angular velocity of a vibration gyro and a DC component of the output of the shake detection sensor is cut and then integrated to obtain an angular displacement. The sensor output calculation means for obtaining

The angular displacement signal from the vibration detecting means 91 is input to the target value setting means 92. The target value setting means 92 is a variable differential amplifier 92 a and a sample hold circuit 9.
2b, and a sample hold circuit 92b
Is always being sampled, the two signals inputted to the variable differential amplifier 92a are always equal and the output thereof is zero. However, when the sample-and-hold circuit 92b is put into a hold state by an output from a delay unit 93, which will be described later, the variable differential amplifier 92a starts outputting continuously with the time being zero.

The amplification factor of the variable differential amplifier 92a is variable by the output of the image stabilization sensitivity setting means 94. The reason is that the target value signal of the target value setting means 92 is a target value (command signal) that causes the correction optical device to follow, but the correction amount (anti-vibration sensitivity) of the image plane with respect to the drive amount of the correction optical device is zoomed. This is because the change depends on the optical characteristics based on the focus change such as the focus, so that the change in the image stabilization sensitivity is compensated.

Therefore, the image stabilization sensitivity setting unit 94 receives the zoom focal length information from the zoom information output unit 95 and the focus focal length information based on the distance measurement information of the exposure preparation unit 96, and based on the information The variable differential amplifier 92a of the target value setting means 92 is calculated by calculating the vibration sensitivity or extracting the vibration isolation sensitivity information that is set in advance based on the information.
Change the amplification factor of.

The correction driving means 97 are ICs 731p, 731y, 732 mounted on the hard board 715, and the target value from the target value setting means 92 is the command signal 730p, 7
It is input as 30y.

The correction starting means 98 is a switch for controlling the connection between the IC 732 on the hard board 715 and the coils 76p and 76y. Normally, by connecting the switch 98a to the terminal 98c, each of the coils 76p and 76y is connected. Both ends are short-circuited, and when the signal of the logical product means 99 is input, the switch 98a is connected to the terminal 98b, and the correction optical mechanism 9 is connected.
10 is in the control state (vibration correction is not yet performed,
6p, 76y, and supplies power to the position detecting elements 78p, 7y.
The correction optical mechanism 910 is set at a position where the 8y signal becomes almost zero.
Keep it stable). At the same time, the output signal of the logical product means 99 is also input to the locking means 914, whereby the locking means unlocks the correction optical mechanism 910. The correction optical mechanism 910 and the correction driving means 97 constitute the correction optical device described above.

The correction optical mechanism 910 inputs the position signals of the position detecting elements 78p and 78y to the correction driving means 97 to perform the position control as described above.

When the logical product means 99 receives both the release half-press SW1 signal of the release means 911 and the output signal of the image stabilization switching means 912, the AND gate 99a, which is a component thereof, outputs the signal. That is, when the photographer operates the anti-vibration switch of the anti-vibration switching means 912 and the release means 911 presses the release halfway, the correction optical mechanism 910 is unlocked and put into a control state.

The SW1 signal of the release means 911 is input to the exposure preparation means 96, whereby photometry, distance measurement, and lens focusing drive are performed, and as described above, the image stabilization sensitivity setting means 94 is provided with focus focal length information. Is entered.

The delay means 93 receives the output signal of the logical product means 99, outputs it after one second, for example, and causes the target value setting means 92 to output the target value signal as described above.

Although not shown, the vibration detecting means 91 also starts to operate in synchronization with the SW1 signal of the release means 911. As described above, the sensor output calculation including the large time constant circuit such as the integrator requires a certain period of time from the start until the output is stabilized.

The delay means 93 is the vibration detecting means 91.
Of the correction optical mechanism 910 after waiting until the output of the
The vibration detection means 91 plays the role of outputting a target value signal to the
The image stabilization is started after the output of is stabilized.

The exposure means 913 performs the mirror-up by the release push-off SW2 signal input of the release means 911, opens and closes the shutter at the shutter speed obtained based on the photometric value of the exposure preparation means 96 to perform the exposure, and the mirror-down. Then, the shooting ends.

After the photographing, the photographer releases the shutter 911.
When the hand is released and the SW1 signal is turned off, the logical product means 99 stops the output, the sample hold circuit 92b of the target value setting means 92 enters the sampling state, and the output of the variable differential amplifier 92a becomes zero. Therefore, the correction optical mechanism 910 returns to the control state in which the correction drive is stopped.

Since the output of the logical product means 99 is turned off, the locking means 914 locks the correction optical device 910,
After that, the switch 98a of the correction starting means 98 is connected to the terminal 98
connected to c, the correction optics 910 are out of control.

The vibration detecting means 91 continues its operation for a fixed time (for example, 5 seconds) after the operation of the release means 911 is stopped by a timer (not shown), and then stops.
This is because the photographer frequently performs the release operation after the release operation is stopped, so that it is possible to prevent the vibration detection unit 91 from being activated every time in such a case, and to shorten the standby time until the output is stabilized. Vibration detection means 9
When 1 is already activated, the vibration detecting means 91 sends an activated signal to the delay means 93 to shorten the delay time.

[0095]

[Problems to be Solved by the Invention] As described in FIG.
When stopping the vibration isolation, the support frame 75 is kept in a controlled state, the attraction magnet 730 is deenergized, and the lock ring 719 is rotated to lock the support frame 75.

Actually, however, various usage conditions are conceivable, and for example, the battery may suddenly be exhausted during vibration isolation.

In such a case, it becomes impossible to control the support frame 75 as the center, and as shown in FIG. 18A, the support frame 75 falls in the direction of gravity G (downward in the figure).

Since the power supply is exhausted, the power supply to the attraction magnet 730 also stops, the attraction force between the attraction yoke 729 and the armature 724 disappears, and the lock ring 7
19 is rotated clockwise by the elastic force of the lock spring 728. Therefore, the protrusion 7 of the support frame 75 is pressed by the force of the cam portion 719f.
5f is pushed up, and the support frame 75 returns to the center.

However, the support frame 7 is attached to the lock spring 728.
There was a problem that it was difficult to have enough elastic force to return 5 to the center.

Since the coil (locking coil) 720 of the correction optical device must be housed in a lens barrel (not shown), it cannot be made large.

When the support frame 75 is unlocked, the coil 7
20 to the lock ring 719 and the lock spring 728.
Must be rotated to the angle at which the armature 724 is equalized to the suction yoke 729 by rotating the armature 724 against the elastic force of.

However, since the coil 720 has a dimensional restriction, it is impossible to generate a sufficiently large driving force, and if the elastic force of the lock spring 728 is increased, the armature 724 is increased.
Lock ring 7 up to the angle at which
19 is no longer driven. Therefore, the elastic force of the lock spring 728 cannot be increased.

Therefore, even if the lock ring 719 rotates in the locking direction of the support frame 75 from the state where the support frame 75 falls in the gravity G direction as described above, the cam portion 719f causes the projection 7 to move.
There was a problem that the lock ring 719 stopped rotating because it could not generate enough force to lift 5f.

Looking at this problem in detail, there are two phenomena.

(A) The lock ring 719 does not rotate at all when the support frame 75 is dropped [state of FIG. 18 (a)].

(B) The lock ring 719 rotates,
It stops on the way [see FIG. 18 (b)].

The cause (A) is caused by the protrusion 75f and the cam portion 7.
This is the effect of 19f static friction. The static friction is extremely larger than the dynamic friction, and it is impossible to lift the support frame 75 while overcoming the static friction only by the elastic force of the lock spring 728.

The cause of the above (B) is the lock ring 719.
The lock spring 728 contracts with the rotation (locking direction), and the elastic force gradually weakens. At that time, the support frame 75 was lifted at the beginning of the rotation of the lock ring 719, but it was impossible to lift the support frame 75 midway.

As described above, since the driving force of the coil 720 has no margin, the correction means (the support frame 75, the lens 74, the coil 76) may be taken after the vibration isolation is completed depending on the usage state of the vibration isolation system.
p, 76y, etc., which is a portion of the mechanical portion of the correction optical device that is moved relative to the main plate 71 in the direction orthogonal to the optical axis, is a locking means (a portion that locks the correction means). However, there is a problem that it cannot be locked by the lock ring 719, the coil 720, the lock spring 728, etc.).

(Object of the Invention) An object of the present invention is to provide a correction optical device capable of stably locking the correction means.

[0111]

In order to achieve the above object, the present invention as set forth in claims 1 and 2 provides a locking operation of the correction means in a locking portion of the locking means for locking the correction means. A running section is provided in which the correction means is not locked, and the correction means is locked by the resultant force of the inertial force of the locking portion and the elastic force of the elastic means stored in this running section.

In order to achieve the above object, the present invention according to claim 3 changes the shape of the cam portion provided in the engaging portion of the engaging means according to the elastic force of the elastic means. In other words, the elastic means has a shape in which it falls asleep (the cam angle becomes gentler) as the elastic force of the elastic means weakens, and it has a weak elastic force.
The elastic force of the elastic means is complemented.

Further, in order to achieve the above object, the present invention according to claim 4 is such that the conversion rate of the shape of the cam portion provided in the locking portion of the locking means into the force for locking the correction means. However, the cam portion is made to increase as it is driven in the direction of locking the correction means, and the friction between the correction means and the locking portion is gradually reduced. Is being absorbed.

In order to achieve the above object, the present invention according to claim 5 is such that the cam angle of the cam portion provided in the engaging portion of the engaging means is the range of movement of the correcting means into the engaged state. In this configuration, an accelerating force is applied to the movement of the locking portion in the locking direction for guiding the correction means to the locked state at the cam angle portion that is reversed. .

[0115]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on the illustrated embodiments.

FIG. 1 is a perspective view of a lock ring 719 provided in the correction optical apparatus according to the first embodiment of the present invention, which is different from the conventional lock ring 719 (FIGS. 15 and 18). This is the shape of the cam portion 719f ′ of the lock ring 719. Other configurations are the same as the conventional ones, and thus the description thereof is omitted.

One of the three parts of the cam part 719f 'is enlarged and shown in FIG. 2, and the conventional cam part 719f is shown for comparison.
An enlarged view of is shown in FIG.

2 (a) and 3 (b), the support frame 75 is still in control. Then, FIGS. 2 and 3B are diagrams in which the power source is suddenly consumed and the support frame 75 drops and abuts on the lock ring 719. 2 and 3
(C) shows the initial state of rotation of the lock ring 719, FIG.
FIG. 3D shows the latter state, and the state in which the locking is completely completed is shown in FIG. 4A.

The states of FIGS. 2 and 3 (a) and 3 (b) are the same in this embodiment and the conventional example. However, in the state of (c) at the initial stage of rotation (when rotated by θ), in the present embodiment of FIG. 2, the cam portion 719f of the protrusion 75f in the rotation angle range at this time (between the straight lines 21 and 22). Since the contact surface with respect to is a circular arc concentric with the rotation center of the lock ring 719, it does not have a force that causes the support frame 75 to be centered.

Then, as the lock ring 719 rotates, the elastic force of the lock spring 728 (not shown) becomes weaker, and the inertial force of the lock ring 719 is absorbed. The cam angle of the cam portion 719f 'comes to rest from around the arrow 24 of 2 (d) (lock ring 7
If the rotation amount of 19 is constant, the lift amount of the support frame 75 at that time decreases when the cam is laid down.
If the rotation force of the lock ring 719 is constant, the support frame lift force at that time increases. Therefore, even if the lock ring 719 has a weak rotation force, the support frame can be lifted.

In FIG. 3, for example, the lock ring 719 can rotate in the state of FIG.
Since the cam angle of the cam portion 719f is constant irrespective of the rotation of the lock ring 719 even in the state of, the elastic force of the lock spring 728 (not shown) becomes weaker as the lock ring 719 rotates, At point 32, the lock ring 719 stops rotating.

When the cam angle is laid in the range 25 in FIG. 2D, there is a demerit that the amount of rotation of the lock ring 719 until the support frame 75 is completely pushed up increases. The rotation amount of the lock ring 719 is determined by the relationship between the coil 720 and the opposing permanent magnet 718, and cannot be easily increased.

Therefore, as shown in FIG. 4A, the support frame 75 is still in the range of the cam portion 719f 'of the lock ring 719 even when it is completely locked [in FIG. 15A, the support frame is a cam. It is out of the range of the part 719f].

However, as described above, the cam portion 719
Since the angle of f ′ is lying down as the support frame 75 is locked, the vibration (impact) of the support frame 75 is transmitted from the protrusion 75f to the cam portion 719f ′, and the lock ring 719 is rotated and locked. It is never released (no reversibility).

(Second Embodiment) FIG. 5 shows a second embodiment of the present invention.
2 is that the recess 51 is provided in the cam portion 719f ″ of the lock ring 719.

5 (a) to 5 (d) are the same as those shown in FIGS.
(A) to (d), and the effect in this embodiment appears from (c).

In FIG. 5C, the lock ring 719 is formed.
In the initial stage of rotation of the support frame projection 7
The contact between 5f and the cam portion 719f is released. Therefore, in this section, there is no friction between the projection 75f and the cam portion 719f ″, and the lock ring 71 is elastically moved by the lock spring 728 (not shown).
You can accelerate 9 enough.

Therefore, thereafter, the projection 75f is again formed on the cam portion 7 again.
When the support frame 75 is lifted by the cam angle while abutting against 19f ″, the lock ring 719 has a sufficient rotational energy, so that the correction means can be locked stably.

By having such a concave portion 51, that is, a cam portion having an angle opposite to the direction in which the support frame 75 is lifted up, rotational energy can be stored in the lock ring 719 at this portion, and a stable correction means can be locked. It is possible to operate.

According to each of the above embodiments, the cam section 719f 'of the lock ring 719 is provided with an approach section (between the straight lines 21 and 22 in FIG. 2C), and the inertia force of the lock ring 719 and the lock spring 728 are provided. Since the support frame 75 is locked by the resultant force of the elastic force, the problem (A) described in the conventional example can be solved. That is, even if the elastic force of the lock spring 728 is weak, it is possible to rotate the lock ring 719 to the locking position of the support frame 75 and reliably lock the support frame 75.

The cam angle of the lock ring 719 is
As the elastic force of the lock spring 728 becomes weaker, as shown in FIGS. 2 and 5, the configuration is such that the lock spring 728 lays down, so that the problem (B) described in the conventional example can be solved. That is, the elastic force of the lock spring 728 is complemented by the cam angle, and the lock ring 719 can be rotated to the locking position of the support frame 75, so that the support frame 75 can be reliably locked.

Further, although the cam angle is made to lie with the change in the elastic force of the lock spring 728 as described above, even if there is no change in the elastic force due to the rotation of the lock ring 719, for example, the above (B) The lock ring will stop halfway. For example, even if the running section is provided in the cam portion 719f ′ of the lock ring 719 as described above and the support frame 75 can be started to be locked by the inertial force of the lock ring, the projection 75f of the support frame 75 and the lock ring 719 can be locked. Cam part 7
The friction between 19f 'weakens the inertial force, and the rotation of the lock ring 719 stops.

Also for this problem, the lock ring 719
By setting the cam angle of the cam portion 719f ′ of No. 1 to lie as the support frame 75 is locked, the friction between the support frame 75 and the lock ring 719 is gradually reduced,
It is possible to prevent the lock ring inertial force from being absorbed by the brake due to friction.

Further, as shown in FIG. 5, a portion in which the angle of the cam is reversed (a cam angle in which the support frame 75 is in the unlocking direction even when the lock ring 719 is driven in the locking direction) is provided between them. Since the lock ring 719 is configured to be accelerated sufficiently, the support frame 75 can be reliably locked.

More specifically, the angle formed by the contact position (when the support frame is dropped) of the cam portion 719f ″ with the protrusion 75f in the state where the lock ring 719 is suction-held by the suction yoke 729 (maximum locking release position). Is opposite to the angle formed when the lock ring 719 rotates in the support frame locking direction and the support frame 75 is locked [see FIG. 5 (b)]. When rotating in the locking direction from the locking release position, the cam angle shape is such that the support frame is further dropped at the beginning of rotation, and then the cam angle shape is such that the support frame 75 is returned to the center.

By doing so, the run-up can be made smoother and the support frame 7 can be supported by the weak elastic force of the lock spring 728.
It becomes possible to lock 5 stably.

(Correspondence between Invention and Embodiment) In the present embodiment, the lens 74, the support frame 75, the coils 76p, 7
6y, IRED 77p, 77y, support balls 79a, 79
b, the charge spring 710 corresponds to the correction means of the present invention,
Permanent magnet 718, lock ring 719, cam portion 719
f ′ and 719f ″, coil 720, armature pin 721, armature rubber 722, armature spring 7
23, armature 724, lock rubber 726, lock yoke 727, attraction yoke 729, attraction magnet 73
0 corresponds to the locking means of the present invention, and the lock spring 728 corresponds to the elastic means.

The lock ring 719 corresponds to a locking portion, and the cam portions 719f 'and 719f "correspond to a cam portion provided on the cam portion.

The above is the correspondence relationship between each configuration of the embodiments and each configuration of the present invention, but the present invention is not limited to the configurations of these embodiments, and the functions shown in the claims,
It goes without saying that any structure may be used as long as the functions of the embodiments can be achieved.

(Modification) In the present invention, as the vibration detecting means, an angular accelerometer, an accelerometer, an angular velocity meter, a speedometer, an angular displacement meter, a displacement meter, or a method for detecting the image shake itself is used. Anything that can be detected may be used.

In the present invention, the vibration detecting means and the correcting means can be separately provided in a plurality of devices which can be attached to each other, for example, a camera and an interchangeable lens which can be attached thereto.

In the present invention, each structure or a part of the structures of the claims or the embodiments may be provided in a separate device. For example, the vibration detection means may be provided in the camera body, the correction means may be provided in the lens barrel mounted in the camera, and the control means for controlling them may be provided in the intermediate adapter.

Further, although the present invention has been described as applied to a camera such as a single-lens reflex camera, a lens shutter camera, a video camera, etc., it may be applied to other optical devices and other devices, and also as a constituent unit. Is something that can be done.

[0144]

As described above, according to the present invention,
The catching portion of the catching means for catching the correcting means is provided with a running section where the correcting means is not locked, and the resultant force of the inertial force of the locking section and the elastic force of the elastic means stored in this running section. The correction means is locked by.

Further, according to the present invention, the shape of the cam portion provided in the engaging portion of the engaging means is changed in accordance with the elastic force of the elastic means, that is, as the elastic force of the elastic means becomes weaker. The shape is such that it comes in (the cam angle becomes gentle), and the elastic force of the elastic means is complemented.

Therefore, even the elastic means having a weak elastic force can stably lock the correcting means.

Further, according to the present invention, the conversion rate of the shape of the cam portion provided in the locking portion of the locking means into the force for locking the correction means is such that the cam portion locks the correction means. The friction between the correction means and the locking portion is gradually decreased so that the inertial force of the locking portion is not absorbed by the brake due to the friction.

Further, according to the present invention, the cam angle of the cam portion provided on the locking portion of the locking means has a portion which is reversed in the moving range of the correction means to the locked state. In the opposite cam angle portion, the acceleration force is applied to the movement of the locking portion in the locking direction for guiding the correction means to the locked state.

Therefore, the correction means can always be stably locked.

[Brief description of drawings]

FIG. 1 is a perspective view showing a lock ring included in a correction optical device according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining a shape of a cam portion provided in the lock ring of FIG.

FIG. 3 is a diagram for explaining a shape of a cam portion provided in the lock ring of FIG.

FIG. 4 is a view showing a state when the lock ring of FIG. 1 is driven.

FIG. 5 is a diagram for explaining the shape of a cam portion of a lock ring included in the correction optical device according to the second embodiment of the present invention.

FIG. 6 is a perspective view showing a schematic configuration of a conventional anti-vibration system.

7 is an exploded perspective view showing the structure of the correction optical device in FIG.

FIG. 8 is a view for explaining the shape of a hole of a support frame into which the holding means of FIG. 7 is inserted.

FIG. 9 is a cross-sectional view illustrating a state where a support frame is incorporated into the base plate of FIG. 7;

FIG. 10 is a perspective view showing the main plate shown in FIG. 7;

FIG. 11 is a perspective view showing the support frame shown in FIG. 7;

FIG. 12 is a perspective view showing the lock ring shown in FIG. 7;

FIG. 13 is a front view showing a support frame and the like in FIG. 7;

FIG. 14 is a circuit diagram showing a configuration of an IC for amplifying the output of the position detecting element of FIG.

FIG. 15 is a diagram showing a state when the lock ring of FIG. 7 is driven.

16 is a diagram showing signal waveforms at the time of lock ring driving in FIG.

FIG. 17 is a block diagram illustrating a circuit configuration of an image stabilizing system of a camera equipped with the image stabilizing system.

FIG. 18 is a diagram for explaining a case where the battery is exhausted when the lock ring of FIG. 7 is driven.

[Explanation of symbols]

 74 Lens 75 Support Frame 76p, 76y Coil 77p, 77y Infrared Light Emitting Diode (IRED) 79a, 79b Support Ball 710 Charge Spring 718 Permanent Magnet 719 Lock Ring 719f 'Cam Part (First Embodiment) 719f "Cam Part ( Second embodiment) 720 Coil 721 Armature pin 722 Armature rubber 723 Armature spring 724 Armature 726 Lock rubber 727 Lock yoke 728 Lock spring 729 Adsorption yoke 730 Adsorption magnet

Claims (5)

[Claims] 1. A locking means having a locking portion for locking a correction means for eccentricizing an optical axis, and an elastic means for urging the locking portion in a locking direction of the correction means, The correction optical device, wherein the stop means locks the correction means by a resultant force of an inertial force of a locking portion that locks the correction means and an elastic force of the elastic means. 2. The correction optical device according to claim 1, wherein the locking portion has a run-up section that is unrelated to locking in a certain section from the start of the locking operation of the correction means. 3. A locking means having a locking portion for locking a correction means for eccentricizing an optical axis, and an elastic means for urging the locking portion in a locking direction of the correction means, The stop portion has a cam portion for guiding the correction means from the non-locked state to the locked state, and the shape of the cam portion changes according to the elastic force of the elastic means. Correcting optical device. 4. A locking means having a locking part for locking a correction means for eccentricizing an optical axis, wherein the locking part guides the correction means from a non-locked state to a locked state. The cam portion has a shape in which a conversion rate to a force for locking the correction means increases as the cam portion is driven in a direction to lock the correction means. A correction optical device characterized by. 5. A locking means having a locking cam portion for locking a correction means for eccentricizing an optical axis, wherein the locking portion guides the correction means from a non-locked state to a locked state. The cam angle of the cam portion is
A correction optical device having an opposite portion in a moving range of the correction means to the locked state.