JP3044128B2 - Image blur prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image blur correction device that corrects image blur caused by camera shake in a camera, optical equipment, or the like.

[0002]

2. Description of the Related Art The prior art to which the present invention is applied will be described below.

[0003] In modern cameras, since all important operations for photographing such as exposure determination and focusing are automated, there is a very low possibility that a person who is unskilled in camera operation will fail in photographing. It was difficult to automatically prevent only a shooting failure due to camera shake.

Therefore, a camera for preventing a photographing failure due to the camera shake has been studied. In particular, a camera for preventing a photographing failure due to a camera shake of a photographer has been actively developed and researched in recent years. Have been.

Taking the camera shake at the time of photographing as an example, the frequency is usually 1 Hz to several tens of Hz. Even if the camera shakes, the subject is aimed at the camera viewfinder. It is possible to confirm that there is no image blur at the point in time, and the camera shutter release
In order to be able to take pictures without image blur at the time of
As a basic idea, it is necessary to detect camera shake and displace the correction lens according to the detected value.

In order to achieve this object, that is, to achieve photographing without causing image shake even if camera shake occurs, first, camera shake detection is basically performed by detecting angular acceleration, angular velocity, etc. Can be performed by mounting a camera with a vibration sensor that detects the vibration and a camera shake detection system that outputs an angular displacement by integrating the sensor signal electrically or mechanically. Then, based on this detection information, a correction optical mechanism having a correction lens that decenters or tilts the photographing optical axis as an optical correction unit is driven to perform image blur correction.

Here, an outline of an image blur correction camera system using an angular accelerometer will be described with reference to FIG.

In this example, an image shake derived from a camera vertical shake 51p and a camera horizontal shake 51y in the direction of the arrow 51 is constituted, and 52 in the figure denotes a lens barrel, 53p and 53.
y Each vertical camera shake angular acceleration, in the angular accelerometer for detecting a lateral deflection angle acceleration, each of the angular acceleration detection direction 54
Indicated by p, 54y. 55p and 55y are integrators configured by using a known analog integration circuit, which integrates an angular acceleration signal and converts it into a camera shake angular displacement. The correction optical mechanism 56 (57p, 57y drives
, 58p and 58y are correction optical position sensors) are driven in the directions perpendicular to the optical axis in the directions of 51p and 51y, and the photographic optical axis is decentered to secure stability on the image plane 59 and to correct the image blur. Have gained.

Next, a correction optical mechanism suitably used as the optical correction means will be described with reference to FIG.

First, in the correction optical mechanism shown in FIG. 7, the correction lens 21 can be freely driven in two directions (pitch, yaw direction 22p, 22y) perpendicular to the optical axis and perpendicular to each other. The configuration is shown below.

The fixed frame 23 holding the correction lens 21 is
The pitch slide shaft 25p can slide on the pitch slide shaft 25p via the slide bearing 24p.
6 attached.

The shaft 220p is attached to the fixed frame 23 and is fitted in a fitting groove 26a provided in the first holding frame 26. When the fixed frame 23 slides on the pitch slide shaft 25p, the pitch This is a tilt stopper that enables sliding in a plane perpendicular to the optical axis without rotating around the slide shaft 25p.

A pitch coil 28p is mounted on the fixed frame 23. The pitch coil 28p is placed in a magnetic circuit composed of a pitch magnet 29p and a pitch yoke 210p.
3 is driven in the pitch direction 22p. The fixed frame 23 is provided with a slit 211p and a light projector 212p (infrared light emitting diode), and the light receiving device 213p (semiconductor position detecting element PSD) on the housing 214 is used for the fixed frame 23. The position in the pitch direction 22p is detected.

Here, the housing 214 is integral with a lens barrel (not shown in FIG. 7) and is formed in a plane perpendicular to the photographing optical axis.

A sliding bearing 24y is fitted to the first holding frame 26, and can slide on a yaw slide shaft 25y.
The yaw slide shaft 25y is fixed to the housing 214. Since the housing 214 is integral with the lens barrel, the first holding frame 26 can move in the yaw direction 22y with respect to the lens barrel.

The fixed frame 23 has a yaw coil 28.
y is attached. This yaw coil 28y is placed in a magnetic circuit composed of a yaw magnet 29y and a yaw yoke 210y.
Is driven in the yaw direction 22y.

The shaft 220y is attached to the housing 214 via a fixing member 221, and the first holding frame 26
And has the same function as the above-described shaft 220p. That is, when the first holding frame 26 slides on the yaw slide shaft 25y, the first holding frame The fixed frame 23 attached to the frame 26 via the pitch slide shaft 25p is a tilt stopper that enables sliding in a plane perpendicular to the optical axis without rotating around the yaw slide shaft 25y.

The fixed frame 23 further includes a slit 211.
y and a light emitter 212y (infrared light emitting diode) are provided, and the yaw direction 22y of the fixed frame 23 is related to the light receiver 213y (semiconductor position detecting element PSD) on the housing 214 as in the pitch direction. Is detected.

As described above, the eccentric moving portion of the correction optical mechanism is composed of the fixed frame 23 including the correction lens 21 and the slit 211.
p, 211y, floodlights 212p, 212y, coil 28
p, 28y, and moves integrally with the correction lens 21.

The pitch direction 22p of the correction lens 21 and the yaw
In the driving in the direction 22y, the outputs of the light receivers 213p and 213y are amplified by the amplifiers 215p and 215y and the coils 28p and
28y, the fixed frame 23 is driven and executed,
Thereby, the outputs of the light receivers 213p and 213y change. Here, when the driving direction (polarity) of the coils 28p and 28y is set to a direction in which the outputs of the light receivers 213p and 213y become smaller, the outputs of the light receivers 213p and 213y are almost zero in the closed system indicated by the solid lines 218p and 218y. It becomes stable at the point where

Here, the compensation circuits 216p and 216y are circuits for further stabilizing the closed system, and the driving circuit 217
p, 217y is a circuit for supplementing the current applied to the coils 28p, 28y.

The anti-vibration system of FIG. 6 is configured in this manner.

When command signals 219p and 219y corresponding to image blur correction are externally applied to such an image stabilizing system, the correction lens 21 moves in the pitch direction 22p.
In the yaw direction 22y, the driving signal is driven faithfully in response to the command signal, and an image blur correction effect on the image plane is obtained.

[0024]

However, in the conventional example, considering the relative inclination between the optical axis 21a of the correction lens 21 and the optical axis of the photographing system, many members are required to support the correction lens 21. Therefore, the dimensional errors of each part are accumulated, and it is difficult to control the inclination within an allowable value for obtaining a predetermined optical performance.

The correction lens 21 is held by a fixed frame 23,
Taking the tilt of the optical axis 21a of the correction lens 21 in the yaw direction 22y as an example, the slide bearing 24p, the pitch slide shaft 25
p, which is determined by the shaft 220p of the tilt stopper via the first holding frame 26 and the fitting groove 26a.

The inclination of the mounting of the housing 214 with respect to the lens barrel also affects both directions. For this reason, it is necessary to reduce the dimensional accuracy of the member that affects the inclination of the optical axis 21a of the correction lens 21 and the optical axis of the imaging system to a strict one.

[0027] The present invention has been made in view of the above circumstances, without increasing the accuracy of the components, the image blurring complement capable of holding the image blur correction <br/> performance facilitate high levels
It is intended to provide a correct device.

[0028]

According to an aspect of the present invention, there is provided a correction optical system for correcting an image blur by displacing in a predetermined direction different from an optical axis direction of an optical system. Means and holding means for holding the correction optical means
When, by supporting the holding means movable, supporting means for the movable said correcting optical unit in the predetermined direction, before
The holding means is supported by the support means to maintain a movable direction.
While holding, the correction optical means with respect to the holding means
And adjustable inclination, it is an image stabilizer and a adjusting means for adjusting the inclination of the optical axis of the correction optical unit with respect to the optical axis of the optical system. Similarly, in order to achieve the above object, the present invention according to claim 2 includes a correction optical unit that corrects image blur by displacing in a predetermined direction different from the optical axis direction of the optical system, and a lens barrel. Solid
For a given base member held in Joteki, supporting means for supporting the movable said correcting optical unit in the predetermined direction, adjusting the tilt of the base member is fixed to the lens barrel
The correction light with respect to the optical axis of the optical system.
Yes and adjusting means for adjusting the inclination of the optical axis of Manabu means
An opening facing the outer peripheral direction is provided at a predetermined position of the lens barrel.
Is provided, and the adjusting means is provided on the base member,
Extends in the outer peripheral direction from a position facing the opening of the barrel
The image blur correction device is provided so as to perform

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 and FIG. 2 are views showing a main part of a first embodiment of the present invention, and the same parts as those in FIG. 7 are denoted by the same reference numerals.

The difference from the conventional example of FIG. 7 is that the shafts 220p and 220y of FIG. 7 are replaced by eccentric shafts 301p and 301y having spherical end portions.

The spherical eccentric shafts 301p, 301p
The function of y is shown in FIG.
2 will be described with reference to FIG.

The cylindrical portion 301p _{1 of the} eccentric shaft 301p
It is inserted into the hole 302a of the fixed frame 23, a slit 301p ₂ from the driver - hole 302a centerline 3 of at
01a ₁ is rotatable. Center line 301a of the center of the spherical portion 301p ₃ of eccentric shaft 301p is well 302a
It is eccentric with respect to ₁ by A and is fitted in the fitting groove 26a of the first holding frame 26. Then, the eccentric shaft 301p integrated with the fixed frame 23 slides in a direction perpendicular to the paper surface of FIG. 2 (axial direction of the pitch slide shaft 25p in FIG. 1).

[0034] Therefore, by rotating the eccentric shaft 301p to the center line 301a _1, the fixing frame 23 first
2 can be slid in the direction perpendicular to the plane of FIG. 2 in a state of being displaced by a maximum A with respect to the fitting groove 26a of the holding frame 26 of FIG.

Returning to FIG. 1, the fixing frame 23 is fixed to the center of the pitch slide shaft 25p, the fitting groove 26a and the shaft 30.
Assuming that the distance between the contact point of the spherical portion 301p3 of 1p and the contact point is L1, the maximum angle .theta.
It indicates that rotation is possible by ₁ (= A / L1).

This means that the optical axis 21a of the correction lens 21 held by the fixed frame 23 is inclined by the maximum angle θ ₁ (= A / L1) in a plane formed by the optical axis 21a and the yaw direction 22y. Is possible.

Another eccentric shaft 301y has the same shape as the eccentric shaft 301p, and is rotatably press-fitted into the fixing member 221 instead of the hole 302a of the fixing frame 23. Therefore, by rotating the eccentric shaft 301y, the first holding frame 26
Assuming that the distance between the center of 5y, the fitting groove 26b and the contact point of the spherical portion of the shaft 301y is L2, the yaw slide shaft 2
It is rotatable around 5y by the maximum angle θ ₂ (= A / L2).

This is because the fixed frame 23 has the pitch slide shaft 2
The structure attached to the first holding frame 26 via 5p indicates that the fixed frame 23 is rotatable by the maximum angle θ ₂ (= A / L2) about the yaw slide shaft 25y.

This means that the maximum angle θ ₂ (= A / L2) in the plane formed by the optical axis 21a of the correction lens 21 held by the fixed frame 23 and the optical axis 21a in the pitch direction 22p.
Indicates that it is possible to tilt only.

If the amount of eccentricity A of the eccentric shafts 301p and 301y is set to a value which can always adjust the relative inclination between the optical axis 21a of the correction lens 21 and the optical axis of the photographing system within a predetermined value. The relative inclination between the optical axis 21a of the directional correction lens 21 and the optical axis of the photographing system also varies with the eccentric shaft 301.
By rotating p and 301y, it is possible to make an adjustment to always suppress the relative inclination within a predetermined value.

Such adjustment can also be performed by a collimator based on the mounting position of the correction optical mechanism alone.
Further, after the adjustment, if the eccentric shafts 301p and 301y are adhered or the like so as not to rotate, the performance at the time of the adjustment can be maintained.

In the first embodiment, the fixed frame 23 holding the correction lens 21 is tilted with respect to the optical axis of the photographing system by the eccentric shafts 301p and 301y in the correction optical mechanism as the optical correction means. The correction lens 21
The relative inclination between the optical axis 21a and the optical axis of the photographing system can be adjusted.

With such a configuration, 1) a correction lens 2 of a correction optical mechanism as an optical correction means
The relative inclination between the first optical axis 21a and the optical axis of the photographing system can be adjusted within a predetermined value.

2) In order to realize the above 1), there is no need to add any parts, only by replacing the shaft with an eccentric shaft, and there is no increase in space.

3) It is possible to suppress the relative inclination according to the adjustment to within the predetermined value without requiring the strict component precision to suppress the relative inclination within the predetermined value as in the related art. is there.

4) Such adjustment can be performed by the correction optical mechanism alone. There is such an effect.

(Second Embodiment) FIGS. 3 to 5 are views showing the main parts of a second embodiment of the present invention, and the same parts as those in FIG. 1 are denoted by the same reference numerals.

The difference from the first embodiment is that the housing 214 shown in FIG. 1 has a shape which can be attached to a lens barrel 511 having three rollers which engage with cams of other lens barrels. In that it is mounted with one concentric pin 512 and two eccentric pins 513a and 513b having two eccentric amounts C used for the mounting.

Projections 514a are provided on the outer periphery of the housing 514 at three equal positions, and three holes 514b into which the small diameter sides of one concentric pin 512 and two eccentric pins 513a and 513b are press-fitted are provided on the outer periphery. It is evenly distributed. The housing 514 fits into the groove 511a of the lens barrel 511 with three equally-sized projections 514a as rotation stoppers. Thus, the housing 514 is positioned with respect to the lens barrel 511 without rotating around the optical axis.

On the outer peripheral side of the three grooves 511a of the lens barrel 511, elongated holes 515a having a width B in the circumferential direction, which are fitted to the large diameter side of the eccentric pins 513a and 513b and the concentric pin 512, are provided.
515b and 515c exist.

After the housing 514 is inserted into the lens barrel 511, the large-diameter side of the eccentric pins 513a and 513b is inserted into the elongated holes 515a and 515b from the outer peripheral side of the lens barrel 511.
The housing 514 is attached to the lens barrel 511 by pressing the large diameter side of the concentric pin 512 into the hole 514 b of the housing 514 while fitting each other.

In this mounted state, the housing 514 is fitted with the concentric pin 512 and the elongated hole 515c of the lens barrel 511 by turning the two eccentric pins 513a and 513b at the large diameter end with a screwdriver or the like. Two eccentric pins 513a and 513b and a long hole 515 are provided with the joint as a fulcrum.
a and 515b can be moved in the optical axis direction at two positions.

As a result, the optical axis of the correction lens 21 attached to the housing 514 can be moved in any direction.

Here, if the amount of eccentricity of the eccentric pins 513a and 513b is set to a value which can always adjust the relative inclination between the optical axis 21a of the correction lens 21 and the optical axis of the photographing system within a predetermined value, The relative inclination between the optical axis 21a of the correction lens and the optical axis of the photographing system in any direction can be determined by the eccentric pins 513a and 513b.
By rotating, it is possible to make an adjustment that always suppresses the relative inclination within a predetermined value.

FIG. 4 is a sectional view of the eccentric pin 513a.

When the eccentric pin 513a is rotated, the housing 514 is inclined with respect to the lens barrel 511, so that a clearance is provided on the outer peripheral side. Also, during adjustment, the eccentric pin 513a is inserted into the elongated hole 515 even if the housing 514 is tilted.
The fitting portion between the elongated hole 515a and the eccentric pin 513a is also substantially point-contact in the cross-sectional view so as not to be restricted by the fitting portion with a.

FIG. 5 shows the eccentric pins 513 a and 51
Even if the housing 514 is greatly inclined using the eccentric pin 513 d in which the tip shape of 3b is changed to a spherical shape, the eccentric pin 513 d is not restricted by the fitting portion with the long hole 515 a,
5 shows a modification of FIG. 4 in which an adjustment corresponding to the amount of eccentricity C can be performed.

In this embodiment, the adjustment can be made by a collimator based on the mounting position of the correction optical mechanism alone. After the adjustment, the eccentric pins 513a, 51
The performance at the time of adjustment can be maintained by applying adhesion or the like to 3b so as not to rotate.

In the second embodiment described above, the entire correction optical mechanism is tilted with respect to the optical axis of the photographing system at the portion supporting the correction optical mechanism, which is an optical correction means, so that the optical axis of the correction lens 21 is adjusted. The relative inclination between the optical axis 21a and the optical axis of the photographing system can be adjusted.

With such a configuration, 1) a correction lens 2 of a correction optical mechanism as an optical correction means
The relative inclination between the first optical axis 21a and the optical axis of the photographing system can be adjusted within a predetermined value.

2) In order to realize the above 1), the correction optical mechanism can be mounted on the lens barrel only by replacing it with two eccentric pins, and there is almost no increase in cost and space.

3) It is possible to suppress the relative inclination according to the adjustment to within the predetermined value without requiring strict component accuracy to suppress the relative inclination within the predetermined value as in the related art. is there.

4) Such adjustment can be performed after the correction optical mechanism is attached to the lens barrel. There is such an effect.

This is because even if a lens barrel for supporting another photographing lens around the lens barrel 511 is installed, if there is a hole or space for rotating the two eccentric pins, the optical axis 2 of the correction lens 21 can be adjusted.
The relative inclination between 1a and the optical axis of the photographing system can be adjusted within a predetermined value.

(Correspondence between Invention and Embodiment) In the above embodiment, the correction lens 21 is used as the correction optical unit of the present invention.
The holding frame 26 serves as the holding means of the present invention,
The shaft fixing portion of the housing 214 to which the shaft and the shaft are fixed is attached to the supporting means of the present invention.
01p and the fitting groove 26a of the holding frame 26 are the adjusting means of the present invention according to claim 1, and the lens barrel 511 is the present invention according to claim 2.
3. The invention according to claim 2, wherein the housing 514 is provided in the lens barrel.
The yaw slide shaft 25y and the shaft are fixed to the base member.
Shaft fixing portion of the housing 214
Ride shaft 25p and shaft fixing of holding frame 26 to which the shaft is fixed
The fixed portion corresponds to the supporting means of the present invention according to claim 2 , the eccentric pins 513a and 513b correspond to the adjusting means of the present invention according to claim 2, and the elongated holes 515a and 515b correspond to the supporting means of the present invention according to claim 2.
Each corresponds to an opening .

As described above, according to the present invention, it is possible to provide an image blur correction device that can easily maintain the image blur correction performance at a high level without increasing the accuracy of the components. is there.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main configuration of a vibration isolator according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining an optical axis adjustment by the eccentric pin of FIG. 1;

FIG. 3 is a perspective view showing a main configuration of a vibration isolator according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view for explaining an optical axis adjustment by the eccentric pin of FIG. 3;

FIG. 5 is a sectional view showing a partially modified example of FIG. 4;

FIG. 6 is a perspective view showing a schematic configuration of a vibration-proof camera in which this kind of vibration-proof device is incorporated.

FIG. 7 is a diagram showing a schematic configuration of a conventional vibration damping device.

[Explanation of symbols]

 Reference Signs List 21 correction lens 21a correction lens optical axis 23 fixed frame 26 first holding frame 301p, 301y eccentric shaft 511 lens barrel 512 concentric pin 513a, 513b eccentric pin 514 housing

Claims (2)

(57) [Claims] 1. A correction optical unit for correcting image blur by displacing in a predetermined direction different from the optical axis direction of an optical system, a holding unit for holding the correction optical unit, and the holding unit
By supporting the the movable, supporting means for the movable said correcting optical unit in the predetermined direction, said holding means before
While maintaining the movable direction supported by the support means,
Adjustable inclination of the correction optical means with respect to the holding means
And then, image stabilizer and having an adjustment means for adjusting the inclination of the optical axis of the correction optical unit with respect to the optical axis of the optical system. 2. A correction optical means for correcting image blur by displacing in a predetermined direction different from the optical axis direction of the optical system, and a predetermined base member fixedly held in a lens barrel.
Te, a support means for supporting the movable said correcting optical unit in the predetermined direction, wherein the base member is fixed to the lens barrel
By adjusting the inclination, the optical axis of the optical system can be adjusted.
Adjusting means for adjusting the inclination of the optical axis of the correcting optical means , wherein a predetermined position of the lens barrel is directed to an outer peripheral direction.
An opening is provided, and the adjusting means is provided on the base member.
From the position facing the opening of the lens barrel to the outer periphery
An image blur correction device provided to extend in a direction .