JPH0843769A - Optical device - Google Patents

Abstract

PURPOSE:To reduce cost by miniaturizing the device and reducing parts and an assembly stage. CONSTITUTION:This device is provided with apex angle detection means 9P, 9Y to 11P and 11Y arranged in the vicinity of the central plane of a variable apex angle prism 1 whose one surface is held to freely rock to a fixed member 6 and detecting the apex angle of the prism 1 in a two-dimensional direction, and a control means controlling at least two or more driving means 8P and 8Y based on the apex angle signal obtained from the apex angle detection means and a deflection signal obtained from a deflection detection means. Then, image blurring is corrected only by driving one surface of the prism 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device for controlling the drive angle of a variable apex angle prism.

[0002]

2. Description of the Related Art Conventionally, an optical device using a variable apex angle prism has a structure shown in FIG.

In FIG. 14, 101 is a variable apex angle prism, which is a transparent plate such as glass 101 _1PP and 10
1 _1Y , support frame 1 for supporting the transparent plates 101 _1P , 101 _1Y
01 _P2P and 101 _2Y, the support frame 101 _2P, 101 _2Y reinforcement to that reinforcing ring 101 _3-Way and 101 _3Y, the support frame 101 _2P and bellows film 101 ₄ linking the 101 _2Y, and is formed It is composed of a transparent liquid (not shown) having a high refractive index filled in the open space.

Reference numeral 102 is a part of a lens barrel incorporating an image blur correction device using the variable apex angle prism 101, and 103a, 103b and 103c are parts of a lens group of the optical system. Reference numeral 104 denotes a support fixed to the lens barrel 102, which includes a blind hole 104aY and a through hole 104b.
Y is formed coaxially and forms a swing axis Y-Y for swinging one surface of the variable apex angle prism 101 in the yawing direction. Further, although not shown, a swing axis P-P for swinging the other surface of the variable apex angle prism 101 in the pitching direction at a right angle to the Y-Y axis is provided.

Reference numeral 105Y designates a holding frame for holding the variable apex angle prism 101, which has a shaft-like projection which fits in the blind hole 104aY and is press-fitted with a pin 106Y so as to swing about a swing axis Y-Y. It is movably supported. Further, the pin 106Y fitted into the through hole 104bY is the leaf spring 10
It is biased by 7Y, and holds the position of a holding frame 105Y described later with respect to the blind hole 104aY. Reference numeral 105P denotes a holding frame that holds the variable apex angle prism 101, and has a structure similar to that of the swing axis Y-Y and is swingably supported about the swing axis PP in the pitching direction. Reference numeral 108 denotes a transparent protective plate that protects the mechanical portion of the variable apex angle prism 101 by external force, dust, etc., and 109 is a holding frame thereof.

The variable apex angle prism 101 has a reinforcing ring 101 _3P and a variation in thickness caused by manufacturing error.
And 101 _3Y coaxial variations exist. Reinforcement ring 101 _3Y and holding frame 10 to absorb the coaxial variation
5Y is fitted, and the reinforcing ring 101 _3P and the holding frame 105P have a gap in the radial direction. Further, in order to absorb the variation in thickness, each has a gap in the thrust direction, and by filling an adhesive in the above-mentioned gap at the time of assembly, both sides of the variable apex angle prism 101 are respectively swung with the swing axis Y-. It is swingably supported by Y and PP.

[0007]

However, in the above-mentioned conventional example, since both surfaces of the variable apex angle prism 101 are independently swung in the pitching direction and the yawing direction, respectively. In addition to the need for space, there is a problem in that when it is arranged at the forefront of the optical system, a protective member is required, the mechanical space becomes large, and the cost also becomes high.

(Object of the Invention) It is an object of the present invention to provide an optical device using a variable apex angle prism, which can reduce the cost by downsizing the device and reducing the parts and the assembling process. Is.

[0009]

In order to achieve the above object, the present invention provides at least two driving means for moving a movable surface of a variable apex angle prism in a two-dimensional direction, and a variable apex angle prism. An apex angle detection means arranged near a plane including the swing axis of the movable surface and perpendicular to the optical axis, for detecting an apex angle in the two-dimensional direction of the variable apex angle prism, and an apex obtained by the apex angle detection means. A control means for controlling the drive means based on an angle signal and a drive target position signal of the variable apex angle prism to drive one movable surface of the variable apex angle prism to the drive target position. The prism apex angle can be arbitrarily changed only by driving one side of the apex angle prism.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

FIG. 1 is a sectional view showing a main part of an image blur correction device according to a first embodiment of the present invention. In FIG. 1, 1 is a variable apex angle prism, which is a transparent plate such as glass. _1U and 1 _1M, the transparent plate 1 _1U, 1 supports a _1M support frame 1 _2U and 1 _2M, the support frame 1 _2U, 1 reinforcing ring that reinforces the _2M 1 _3U and 1 _3M, the support frame 1 _2U When one bellows film linking the _2M 1 _4, and, not shown filled in the formed space is composed of a transparent liquid having a high refractive index.

Reference numeral 2 denotes a part of a lens barrel incorporating an image shake correction device using the variable apex angle prism 1, 3a,
Reference numerals 3b and 3c are parts of a lens group of the optical system. Reference numeral 4 denotes a support fixed to the lens barrel 2. Reference numeral 5 is a fixed frame for fixing one surface of the variable vertical angle prism 1 to the support 4, and 6 is a support frame fixed to the other surface of the variable vertical angle prism 1.

The support frame 6 has coils 7P and 7Y.
(Not shown in FIG. 1, but shown in FIG. 3 to be described later) is fixed at a right angle by adhesion or the like. Also, the coil 7P
An upper yoke 8P ₁ and a magnet 8P ₂ and a lower yoke 8P ₃ which is a back yoke of the magnet 8P ₂ are arranged on both surfaces of the actuator 8P with a certain gap to form a magnetic circuit and constitute an actuator 8P (upper yoke, magnet , The lower yoke is held by a space member (not shown), and by energizing the coil 7P, a Lorentz force is generated to drive the support frame 6. Also, coil 7
An actuator 8Y (not shown in FIG. 1 but shown in FIG. 3 to be described later) is arranged in Y as well, and the combined force of the actuators 8P and 8Y acts on the support frame 6.

The deformation of the variable apex angle prism 1 due to this combined force will be described with reference to FIG.

When one surface of the variable apex angle prism 1 is fixed and the other surface is movable, the axes orthogonal to the central plane of the variable apex angle prism 1 are axes X and Y, and the axes orthogonal to X and Y are If Z, the degree of freedom of movement of the movable surface is the movement in each axial direction,
Six degrees of freedom of rotation about each axis are possible.

Here, the movable surface is connected to the fixed surface by a bellows-shaped film having a high stretchability in the Z-axis direction, and the inside thereof is filled with a liquid. Therefore,
Movement in the X and Y axis directions is regulated by the bellows film, and movement in the Z axis direction is regulated by the incompressibility of the sealed liquid and the tension of the bellows film. Further, since the degree of freedom of rotation about the Z axis (roll) is also regulated by the bellows-like film, the degree of freedom at which the movable surface can be easily deformed with respect to the fixed surface is the rotation about the X axis (pitc).
h) and rotation about the Y axis (yaw), and the rotation axis is located on the central plane of the variable vertical angle prism 1 if the variable vertical angle prism is symmetrical.
That is, when the combined force of the actuators 8P and 8Y in FIG. 1 acts on the support frame 6, the movable surface rotates in the combined force direction with respect to the fixed surface of the variable apex angle prism 1 to form the prism apex angle.

FIG. 3 is an exploded perspective view of a movable part, and FIG.
The same reference numerals are given to the same portions as.

In FIG. 3, reference numeral 9 denotes a reflector, which is fixed to the support frame 6 with screws and has a pitch reflecting surface 9P and a yaw reflecting surface 9Y, both reflecting surfaces forming a right angle with each other, In addition, they are also perpendicular to the center planes of the two surfaces of the variable apex angle prism 1 in the initial state. Furthermore,
Both reflecting surfaces are arranged parallel to the actuators 8P and 8Y, respectively. Reference numeral 10P denotes an iR that is a light emitting element that irradiates infrared light with a certain angle on the pitch reflection surface 9P.
Reference numeral 11P denotes an ED, which is a PSD that is an element that receives the infrared light reflected by the pitch reflecting surface 9P.

The iRED10P and PSD11P are shown in FIG.
It is held by a holder 12P (not shown in FIG. 3), which will be described later, and the holder 12P is fixed to the support frame 4 shown in FIG. The aforesaid combination forms a vertical angle sensor in the pitching direction (hereinafter, simply referred to as the pitch direction). Also in the yawing direction (hereinafter, simply referred to as the yaw direction), as shown in FIG. 3, the apex angle sensor in the yaw direction is provided.

Next, the apex angle sensor will be further described with reference to FIGS. 4 (a), 4 (b) and 4 (c). The same members are designated by the same reference numerals, but the subscripts P and Y for distinguishing the pitch and the yaw are omitted.

FIG. 4A shows a state in which the swing angle is 0 degree,
The infrared light emitted from the iRED 10 is reflected by the reflecting plate 9, passes through the slit opening 12s formed in the holder 12, and is applied to the PSD 11. The surface indicated by the alternate long and short dash line C is a surface that includes the swing axis R and is perpendicular to the optical axis, and the positional relationship is such that the center of the light flux comes to the intersection of the reflection plate 9 and the alternate long and short dash line C from the iRED 10. .

FIG. 4B shows a state in which the reflecting plate 9 is swung about the swing axis R (in the center plane of the variable apex angle prism 1) by the angle θ. In this case, the infrared light emitted from the iRED 10 is reflected by the reflection plate 9 as shown in FIG.
Compared to the state of (a), since the reflection plate 9 is inclined by the angle θ, it is inclined by the angle φ. Therefore, an output corresponding to the distance from the slit opening 12s to the PSD 11 can be obtained from the PSD 11 by the light flux passing through the slit opening 12s.

Next, the output change due to the parallel movement of the reflecting surface will be described.

In FIG. 4A, it is apparent that the output obtained from the PSD 11 does not change even if the reflecting plate 9 is translated in the in-plane direction.

FIG. 4 (c) shows a state in which the reflector 9 is translated in the direction perpendicular to the surface (direction of arrow A).

At this time, the infrared light flux reflected by the reflecting plate 9 moves in the direction of arrow B as a whole, and since the infrared light flux has spread, an output corresponding to the light flux movement indicated by X on the PSD 11 is generated. Will be done. However, in this embodiment, the apex angle sensor unit is arranged in the vicinity of the center plane of the variable apex angle prism 1, and the movement of the reflecting surface 9 in the direction of arrow A shown in FIG. Thus, it is possible to obtain the apex angle sensor output according to the change in the apex angle of the variable apex angle prism 1.

Next, referring to FIG. 5, the independence of the vertical angle sensors in the pitch and yaw directions will be described.

As shown in FIG. 3, 9P and 9Y are reflectors for reflecting the infrared luminous flux in the pitch and yaw directions, and the X axis and the Y axis are swing axes in the pitch and yaw directions, respectively. It corresponds. The circle represents the movable surface of the variable apex angle prism 1.

Now, let us consider a case where the movable surface of the variable apex angle prism 1 oscillates by θ degrees about an axis of φ degree from the Y axis as shown in the figure. At this time, the inclination of the movable surface in the pitch and yaw directions is α = θsinφ β = θcosφ, and if the angles α and β can be detected by the apex angle sensors, the independence of the apex angle sensors in the pitch and yaw directions is complete. Kept in. As described above, the output of the apex angle sensor is 9P,
Since it is proportional to the inclination of 9Y, the inclinations of the reflecting surfaces 9P and 9Y are obtained. _Let each angle be α _r , β _r, and θ <<
Assuming 1 and ignoring the higher-order minute terms of θ and higher, tan α _r = tan α- (1/6) θ ³ sin φ co
s ² φ tan β _r = tan β- (1/6) θ ³ cos φ si
It becomes n ² φ. The second term on the right side is a third-order term of θ. For example, when “θ = 3 deg”, the second term is about 1/1000 of the first term even in the worst case. Therefore, although there is crosstalk in the pitch and yaw apex angle sensors, the amount is practically no problem.

Next, FIG. 6 shows a block diagram of an image blur correction device using the variable apex angle prism 1.

In FIG. 6, 20 is a variable apex angle prism 1.
Is a photographic optical system in which is arranged at the forefront. Reference numeral 21 denotes a vibration gyro that is an angular velocity sensor, which is fixed to a fixing member of the device and outputs the angular velocity of the device as a signal. The angular velocity signal is processed by a signal processing circuit 22 such as BPF, integrated by an integrator 23, and output as an angle signal a of the device. Reference numeral 24 denotes the apex angle sensor described above, which outputs a signal proportional to the apex angle of the variable apex angle prism 1. This signal is amplified and filtered by the signal processing circuit 25 and output as the apex angle signal b. In the adder circuit 26, the angle signal a of the device and the variable apex angle prism 1
The apex angle signal b is added with the opposite polarity to obtain the signal c.
This signal c is amplified by the amplifier 27, converted into a drive signal by the drive circuit 28, and the actuator 29 is driven, whereby the prism apex angle of the variable apex angle prism 1 can be changed.

In this circuit configuration, from the apex angle sensor 24 to the actuator 29, the signal c becomes zero, that is, the angle signal a of the device and the apex angle signal b of the variable apex angle prism 1 become equal. A feedback circuit including the variable apex angle prism 1 is formed. Since the variable apex angle prism 1 is driven in a direction in which the movement of the device is canceled, the state of the light beam incident on the photographing optical system 20 does not change, and the image blur can be corrected.

Although FIG. 6 shows the configuration of only one axis (pitch or yaw direction), as already described,
Since the independence of the apex angle sensor in the pitch and yaw directions is practically maintained, it is possible to drive only one side of the variable apex angle prism 1 by having coaxial configurations in the pitch and yaw directions and controlling them independently. Image blur correction in the pitch and yaw directions can be realized.

The embodiment described above has the following unique effects.

1) Since the support mechanism of the movable surface of the variable apex angle prism 1 does not have a sliding bearing portion such as a pin and a hole,
There is no unnecessary load due to friction.

2) The output of the apex angle sensor 24 responds to the angle of the movable surface of the variable apex angle prism 1, and in the feedback control with respect to the target angle signal, the bellows film portion of the variable apex angle prism 1 is unnaturally deformed. Since it does not force (the movable surface swings around the axis you want to swing),
It becomes possible to drive with a minimum driving force.

3) Since the output of the apex angle sensor 24 is sensitive to angle changes, variations in manufacturing the variable apex angle prism 1 (thickness variations, coaxial variations on both sides, accordion of a bellows-like film, etc.) may occur. Even if there is, it does not adversely affect the performance of the image blur correction mechanism (the inclination of the output of the apex angle sensor 24 does not change).

4) Since the support mechanism for the movable surface of the variable apex angle prism 1 does not have bearings such as pins and holes, and the output of the apex angle sensor 24 is sensitive to changes in angle, changes in the environment. In contrast, the performance of the image blur correction function is stable. For example, even if the thickness of the variable apex angle prism 1 is slightly changed due to high or low temperature or high and low pressure, since there is no bearing portion, an increase in lateral pressure of the bearing portion does not cause an increase in load. In addition, there is no concern about running out of oil or entering of dust due to durability. Further, even if the bellows-shaped film causes a creep phenomenon due to being left at a high temperature and the position of the movable surface is slightly displaced, the inclination of the apex angle sensor output does not change.

5) Since the apex angle sensor 24 is of a reflective type, the sensitivity of the change of the movable surface angle of the variable apex angle prism 1 can be increased, so that the distance between the slit opening 12s and the PSD 11 is shortened. This is advantageous in terms of space. Further, since the electric element does not have to be arranged on the movable portion side, the load due to the wiring or the like does not increase.

(Second Embodiment) FIGS. 7 and 8 show a second embodiment in which the present invention is applied to an image blur correction device for optical equipment such as a video camera, and FIG. FIG.

In FIG. 7, 31 is a variable apex angle prism,
Reference numeral 32 is a part of a lens barrel incorporating an image blur correction device using the variable apex angle prism 31, and 33a, 33b, 33.
c is a part of the lens group of the optical system. Reference numeral 34 is a support body fixed to the lens barrel 32. Reference numeral 35 is a fixed frame for fixing one surface of the variable vertical angle prism 31 to the support 34, and 36 is a support frame fixed to the other surface of the variable vertical angle prism 31.

Coils 37P and 37 are provided on the support frame 36.
Y (not shown in FIG. 7) forms a right angle and is fixed by adhesion or the like. Also, maintaining a certain gap on both sides of the coil 37P, the upper yoke 38P ₁ and the magnets 38P ₂ ,
Lower yoke 38 which is the back yoke of the magnet 38P _2.
P-3 is arranged to form a magnetic circuit, and the actuator 3
8P (the upper yoke, the magnet, and the lower yoke are held by a space member (not shown)).
When the coil 37P is energized, a Lorentz force is generated to drive the support frame 36. An actuator 38Y (not shown in FIG. 8) is also arranged in the coil 37Y in a similar configuration, and the combined force of the actuators 38P and 38Y acts on the support frame 36.

39P and 39Y (not shown in FIG. 7)
Is a Hall element for detecting the magnetic field strength generated by the magnets 38P ₂ and 38Y ₂ , and the variable apex angle prism 31
Plane that includes the swing axis of the movable surface of and is perpendicular to the optical axis (dashed line D
(Shown by) is fixed at the central positions of the coils 37P and 37Y by adhesion or the like so as to form an angle of 90 ° with each other. This structure constitutes the apex angle detecting means.

FIG. 8 is an exploded perspective view of a movable part, and FIG.
The same numbers are attached to the same parts as.

Next, the independence of the two apex angle detecting means will be described with reference to FIG.

In FIG. 9, the X-axis and the Y-axis are in-plane axes including the swing axis of the movable surface of the variable apex angle prism 31 and perpendicular to the optical axis. The pitch and the vertical angle in the yaw direction are proportional to the amount of movement of the point at a distance r from the center indicated by points A and B in the paper surface direction.
Since the X-axis and the Y-axis are in the plane in which the rotation axis of the variable apex angle prism 31 exists, when rotation about the X-axis or rotation about the Y-axis occurs, the points on the rotating axes are It is obvious that only one of the apex angle outputs changes because it does not move in the paper surface direction.

Now, let us consider a case in which the Y axis is rotated by an angle θ on the middle axis.

At this time, the vertical angles α and β in the pitch and yaw directions
Is α = θ · sin φ β = θ · cos φ. The amount of movement of the points A and B in the pitch and yaw directions in the paper surface direction is r.sin.phi.sin.theta.r.cos.phi.sin.theta .. Now, when .theta. Is ".theta. <<1," θ.apprxeq.sin.theta. = R.theta..sin.phi. = R.alpha.r.cos.phi.sin.theta. = R.theta..cos.phi. = R.beta., That is, it is proportional to the apex angle in the pitch and yaw directions. Therefore, by detecting the amount of movement of the points A and B in the paper surface direction, it becomes possible to independently detect the pitch and the apex angle in the yaw direction.

The amount of movement of the points A and B in FIG. 9 in the paper surface direction is detected by the actuator 38 and the Hall element 39 (subscripts P and Y for distinguishing pitch and yaw are omitted).

FIG. 10 shows the magnetic flux density distribution in the direction perpendicular to the gap of the actuator 38, the horizontal axis represents the displacement in the moving direction of the Hall element, and the vertical axis represents the magnetic flux density.

In the range of the displacement amount shown by the chain double-dashed line, the magnetic flux density changes so that it can be regarded as a straight line in practical use, and the Hall element oscillates within this range. Since an electric output proportional to the magnetic flux density is obtained by the Hall element, the apex angle detecting means is constituted by the combination of this actuator and the Hall element, and an electric signal proportional to the apex angle formed by the variable apex angle prism 31 is obtained. .

FIG. 11 shows a signal processing circuit of the Hall element.

In FIG. 11, 39 is a Hall element and 40
Is combined with the resistors 40a, 40b, 40c to supply the Hall element 39 with a constant current.
The output for the magnetic field strength (magnetic flux density) of the operational amplifier 41
And differentially amplified by the resistors 41a, 41b, 41c, 41d. The resistor 41e is a variable resistor, and the output with respect to the magnetic field intensity can be shifted by changing the resistance value. When the apex angle formed by the variable apex angle prism is 0 (zero), that is, when the two surfaces are parallel to each other. Is adjusted so that the output becomes equal to the reference voltage Vc (zero point of control). The operational amplifier 42, in combination with the resistors 42a and 42b, amplifies and inverts the output of the operational amplifier 41 around the reference voltage Vc, and changes the resistance value of the variable resistor 42b to determine the ratio of the change in the output voltage with respect to the change in the magnetic field strength. Adjust to the value.

Also in the second embodiment, the variable apex angle prism 3 is provided by providing the same control means in the pitch and yaw directions as the block diagram shown in FIG. 6 of the first embodiment.
It is possible to realize image blur correction in an arbitrary direction of the pitch and yaw directions by driving only one side of 1.

(Third Embodiment) FIG. 12 is a sectional view of the principal part showing a third embodiment in which the present invention is applied to an image blur correction device for optical equipment such as a video camera.

In FIG. 12, 51 is a variable vertical angle prism, 52 is a part of a lens barrel incorporating an image blur correction device using the variable vertical angle prism 52, 53a, 53b,
53c is a part of the lens group of the optical system. Reference numeral 54 is a support body fixed to the lens barrel 52. Reference numeral 55 is a fixed frame for fixing one surface of the variable apex angle prism 51 to the support 54, and 56 is a support frame fixed to the other surface of the variable apex angle prism.

The support frame 56 has coils 57P and 57P.
Y (not shown) forms a right angle and is fixed by adhesion or the like. Also, an upper yoke 58P ₁ and a magnet 58P ₂ and a lower yoke 58P-3, which is a back yoke of the magnet 58P ₂ , are arranged while maintaining a certain gap on both sides of the coil 57P to form a magnetic circuit to form an actuator 58P. Coil 57 (the upper yoke, the magnet, and the lower yoke are held by a space member not shown)
When P is energized, Lorentz force is generated to drive the support frame 56. An actuator 58Y (not shown) is also arranged in the coil 57Y in a similar configuration, and the combined force of the actuators 58P and 58Y acts on the support frame 56.

59P is an iRED emitting infrared light,
It is fixed to the support frame 56. 60P is iRED59P
It is a PSD that receives the infrared light of. The infrared light emitted from the iRED 59P passes through a hole 58P ₁ a provided in the center of the upper yoke 58P ₁ , is narrowed down by a slit opening 55PS provided in the fixed frame 55, and is irradiated onto the PSD 60P to output a position output. can get.

With the above structure, the pitch direction apex angle detecting means is formed, and the yaw direction also has a yaw direction apex angle detecting means (not shown) with the same structure. 90 degrees to each other in the vicinity of a plane including the swing axis of the movable surface of the variable apex angle prism 51 and perpendicular to the optical axis. Are arranged so as to form an angle.

With this configuration, the apex angle of the variable apex angle prism in the pitch and yaw directions can be independently detected for the same reason as explained in FIG. 10 of the second embodiment.

Next, the mechanism of apex angle detection will be described with reference to FIGS. 13 (a) and 13 (b). The same parts as those in FIG. 12 are denoted by the same reference numerals. However, the subscripts P and Y that distinguish the pitch and the yaw direction are omitted.

FIG. 13A shows the case where the support frame 56 including the iRED 59 is at the reference position, and the luminous flux emitted by the iRED 59 is slit opening 55s provided in the fixed frame 55.
It is focused by and is irradiated onto the center of the light receiving surface of the PSD. i
The RED 59, the slit opening 55S, and the PSD 60 are arranged in the vicinity of a plane (indicated by a chain line E) including the swing axis of the movable surface of the variable apex angle prism and perpendicular to the optical axis.

FIG. 13B shows a state in which the holding frame 56 is swung about the swing axis R by the angle δ. IR as shown
The light flux emitted from the ED 59 passes through the inner slit opening 55S and is obliquely applied to the PSD 60. At the light-receiving portion, the light strikes the position X from the center, and the PSD 60 produces an output change proportional to the position. To be

Also in this embodiment, by providing the same control means as the block diagram shown in FIG. 6 in the first embodiment in the pitch and yaw directions, it is possible to drive the pitch and yaw by driving only one surface of the variable apex angle prism. It is possible to realize image blur correction in any direction.

(Correspondence between Invention and Embodiment) Taking the first embodiment as an example, the vibration gyro 21 corresponds to the shake detecting means of the present invention, and the actuators 8P, 8Y and the actuator 29 serve as the driving means of the present invention. Corresponding to the reflectors 9P, 9Y
The iREDs 11P and 11Y and the holder 12 and the apex angle sensor 24 correspond to the apex angle detecting means of the present invention, and the signal processing circuits 22 and 25, the integrator 23, the adding circuit 26, and the amplifier 2 are included.
7 and the drive circuit 28 correspond to the control means of the present invention.

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 or embodiments shown in the claims or the embodiments It goes without saying that any structure may be used as long as it can achieve the function of.

(Modification) In this embodiment, a vibration gyro which is an angular velocity sensor is used as the shake detecting means.
Any angular acceleration sensor, an acceleration sensor, a speed sensor, an angular displacement sensor, a displacement sensor, and a method for detecting the image shake itself may be used as long as the shake can be detected.

Further, in this embodiment, as the driving means for the variable apex angle prism, two driving means for driving in each of the pitch and yaw directions are provided, but it may be two or more.

Further, in the present invention, the shake detecting means and the variable apex angle prism (including the driving 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. Is.

Further, 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 shake detecting means may be provided in the camera body, the variable apex angle prism (including the driving 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.

Furthermore, the present invention can be applied not only to cameras such as single-lens reflex cameras, lens shutter cameras, and video cameras, but also to optical equipment such as binoculars and other devices,
Furthermore, it can be applied as a constituent unit.

Furthermore, the present invention may be constructed by appropriately combining the above embodiments or their techniques.

[0073]

As described above, according to the present invention,
An apex angle detecting means which is arranged in the vicinity of a plane including the swing axis of the movable surface of the variable apex angle prism and perpendicular to the optical axis, and which detects an apex angle of the variable apex angle prism in a two-dimensional direction, and the apex angle detection means. Control means for controlling the driving means based on the apex angle signal obtained from the means and a drive target position signal for the variable apex prism, and for driving a movable surface on one side of the variable apex prism to the drive target position. The prism apex angle can be arbitrarily changed only by driving one surface of the variable apex angle prism.

Therefore, it is possible to reduce the cost by downsizing the device, reducing the number of parts and the assembling steps.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of an image blur correction device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing directions in which the variable apex angle prism of FIG. 1 can move.

FIG. 3 is a perspective view showing the variable apex angle prism of FIG. 1 and its driving means.

FIG. 4 is a cross-sectional view showing the structure of the apex angle sensor of FIG.

FIG. 5 is a diagram for explaining variable apex angles of the variable apex prism in the present embodiment.

FIG. 6 is a block diagram showing a circuit configuration of an image blur correction device according to a first embodiment of the present invention.

FIG. 7 is a sectional view showing a main part of an image blur correction device according to a second embodiment of the present invention.

FIG. 8 is an exploded perspective view of a movable part of FIG.

FIG. 9 is a diagram for explaining independence of two apex angle detecting means in the second embodiment of the present invention.

FIG. 10 is a diagram showing a magnetic flux density distribution in a direction perpendicular to a gap of an actuator according to a second embodiment of the present invention.

FIG. 11 is a circuit diagram showing a signal processing circuit of a Hall element according to a second embodiment of the present invention.

FIG. 12 is a sectional view showing a main part of an image blur correction device according to a third embodiment of the present invention.

FIG. 13 is a diagram for explaining the mechanism of apex angle detection in the third embodiment of the present invention.

FIG. 14 is a sectional view showing a main part of a conventional image blur correction device.

[Explanation of symbols]

 1, 31, 51 Variable apex prism 5 Fixed frame 6 Support frame 7 Drive coil 8, 29 Actuator 9 Reflector 10 iRED 11 PSD 12 Holder 21 Vibration gyro 22, 25 Signal processing circuit 23 Integrator 24 Vertical angle sensor 26 Summing circuit 27 amplifier 28 drive circuit

Claims (1)

[Claims] 1. A variable apex angle prism having a movable surface that is swingably held with respect to a fixed surface, and at least two or more driving means that move the movable surface of the variable apex angle prism in a two-dimensional direction. An apex angle detecting means that is arranged in the vicinity of a plane that includes a swing axis of a movable surface of the variable apex angle prism and is perpendicular to the optical axis, and that detects an apex angle in a two-dimensional direction of the a variable apex angle prism; Control for controlling the drive means based on an apex angle signal obtained from an angle detection means and a drive target position signal of the variable apex angle prism to drive one movable surface of the variable apex angle prism to the drive target position. An optical device comprising: