JPH02120821A - Image stabilization device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image blur correction device applied to optical equipment such as an optical monitoring device and a still camera.

[Prior Art] Recently, various proposals have been made regarding image blur correction devices to be mounted on still cameras, and development of still cameras with image blur correction devices is also progressing.

Conventionally known image stabilization devices include a shake detector for detecting shake (acceleration, velocity, or displacement) of equipment such as a camera, and a shake detector for preventing image blur on the imaging plane of the equipment. a compensating optical system that is moved in a direction to offset image blur caused by the blurring of the device; an arithmetic device that calculates an amount of blur correction to be applied to the compensating optical system based on the output of the blur detector; and the arithmetic device. an actuator that drives the correction optical system based on the output of the correction optical system, a servo detector that detects the movement amount and position of the correction optical system, and a deviation between the output of the arithmetic unit and the output of the servo detector. and a correction optical system drive control device for driving the actuator, and the control system of the image blur correction device is represented by a block diagram as shown in FIG. In FIG. 11, the correction optical system movement amount detector represents the servo detector.

[Problem B to be Solved by the Invention] In a known image stabilization device configured with the control system as described above, a blur detector detects the blur of a device such as a camera, and detects the amount of movement of a correction optical system. Since the correction optical system and the movement amount detector must be mounted on the equipment, there is a disadvantage that the equipment and the equipment become large-sized, and the control system is complicated, so the electronic circuit is also complicated, and therefore the equipment The disadvantages are that the device is expensive.

Therefore, an object of the present invention is to provide a new image blur correction device that can be made smaller than conventional image blur correction devices and can be manufactured at a lower cost than conventional image blur correction devices.
It is an object of the present invention to provide a novel image blur correction device that can make an optical device equipped with an image blur correction device small in size and low in cost.

[Means for Solving the Problems] The present invention provides image blur detection so that a blur detector for detecting blur in an optical device, etc. has a function as a compensation optical system movement amount detector for detecting the amount of movement of a compensation optical system. According to the present invention, it has become possible to make optical equipment and image blur correction devices smaller and lower in cost than in the past.

Specifically, in the image blur correction device of the present invention, the blur detector has a function as a compensation optical system movement amount detector, and when the compensation optical system performs a blur correction operation, the compensation optical system It is characterized in that the output of the blur detector is configured to decrease in conjunction with the motion. Therefore, the image blur correction device of the present invention does not require a correction optical system movement amount detector, and the configuration of the control system of the image blur correction device is simpler than the conventional one, and the circuit configuration of the control device is also simplified. According to the invention, it is possible to realize an image blur correction device that is smaller and lower cost than the conventional one, and it is also possible to realize an optical device with an image blur prevention function that is smaller and cheaper than the conventional one.

In a specific embodiment of the invention described below, one element of the blur detector is fixed to the optical device, the other element of the blur detector is fixed to the correction optics, and the blur detector When the correction optical system is driven in accordance with the blur detection output of the device, the output of the blur detector is configured to decrease as the correction optical system moves.

[Function] When the detectors 31 and 32 that detect the shake of the optical device generate outputs corresponding to the shake of the optical device, the correction optical system drive actuators 33 and 34 are driven, and the correction optical system 30 is moved. . When the correction optical system 30 is moved, the light receiving element 14, which is a component of the detectors 31 and 32, is also moved together with the correction optical system, and as the correction optical system 30 moves, the outputs of the detectors 31 and 32 decrease. The movement of the correction optical system is stopped when the output of the detector becomes zero.

[Example] The present invention will be described in detail below with reference to FIGS. 1 to 10.

FIG. 1 is a perspective view of the mechanical structure of the image stabilization device according to the first embodiment of the present invention, viewed from the front, and FIG. 2 is a perspective view of the main part of the device shown in FIG. FIG. 3, which is a view from below, is a perspective view showing the main parts of the detector, the main parts of the correction optical system, and the actuator for driving the correction optical system taken out from the configuration shown in FIG.

In FIGS. 1 and 2, reference numerals 21 and 22 are a front base plate and a rear base plate that support a correction optical system and an actuator for driving the correction optical system, which will be described later, and are fixed in an optical device such as a camera. An optical path hole 21a is provided through the front base plate 21, and an actuator 33 for driving the correction optical system is provided.
A hole 21b for supporting the optical path hole 22a (see FIG. 2) and a hole 22b for supporting the correction optical system driving actuator 34 are also formed through the rear base plate 22. In addition, a first detector 31 is attached to a recess formed on one side edge of the front base plate 21 and the rear base plate 22,
A second detector 32 (see also FIGS. 2 and 3) is attached to the lower surface of the same side edge of the front base plate 21 and the rear base plate 22. The first detector 31 is a detector for detecting rotational displacement of the optical device about the horizontal axis, and is disposed facing laterally as shown in FIGS. 1 and 3. On the other hand, the second detector 32 has the same structure as the first detector 31, but is placed facing downward in order to detect the rotational displacement of the optical device about the vertical axis. The structure and function of the detectors 31 and 32 will be explained later.

A correction optical system 30 constituted by a variable apex prism device is disposed in a space formed between the front main plate 21 and the rear main plate 22, and the correction optical system 30 is arranged between the front main plate 21 and the rear main plate 22. Supported by

The variable apex angle prism device that constitutes the correction optical system 30 is
As shown in FIGS. 2 and 3, there is an annular front frame 19, a circular front glass plate 15 fixed to the front frame 19, and an annular front glass plate 15 arranged at a predetermined distance behind the front frame 19. A rear frame 20, a circular rear glass plate 16 attached to the rear frame 20, and a front frame 19 and a rear frame 20 fitted at both ends of the outer periphery of the front frame 19 and the outer periphery of the rear frame 20, respectively.
A closed chamber surrounded by a bellows-shaped flexible cylindrical body 17 (see FIG. 2) extending between the front and rear glass plates 15 and 16, and the flexible cylindrical body 17 is filled and sealed. The transparent liquid 18 (see FIG. 2), etc.

As shown in FIG. 3, protrusions 19b and i9c having bottle holes for rotatably inserting a vertical bottle 19a are formed at the top and bottom positions of the outer peripheral surface of the front frame 19. The bins 19a extend rearward from the rear surface of the front base plate 21 as shown in FIG. 2 (only the lower bin is shown in FIG. 2, and only the upper bin is shown in FIG. 3). A pair of protruding arms 21c (only the lower arm is shown in FIG. 2, but another arm 21c is provided on the upper side) protrudes. In other words, front frame 1
9 is a front base plate 21 rotatable about the bin 19a.
is supported by

On the lower protrusion 19c of the front frame 19 is a light-receiving element support plate 2 to which a light-receiving element 14, which is a component of the second detector 32, is fixed.
7 is attached, and the light-receiving element support plate 27 serves as a connector for connecting the light-receiving element 14 to other circuit boards, power supplies, and the like.

One side edge of the front frame 19 (the right side edge in FIG. 3) has a short arm 19d projecting to the right (see FIG. 2. This arm 19d is the arm of the rear frame 20 shown in FIG. 3). 20b) is provided, and the arm 19
As shown in FIG. 2, a shaft 33a of a first correction optical system driving actuator 33 (hereinafter referred to as the first actuator) is fixed to d.

The first actuator 33 is a so-called voice coil type electromagnetic plunger, and includes a cylindrical yoke 26 that is fitted and fixed into the hole 2ib of the front base plate 21, a permanent magnet 24 fixed inside the yoke 26, and a pole piece. 25, shaft 33a
It is fixed to the coil 23 and is composed of various members such as a coil 23. The actuator 33 is generated between the permanent magnet 24 and the coil 33 when the coil 23 is energized in the positive direction? The shaft 33a moves rearward by the iE 6fl force, causing the front frame 19 to rotate around the bin 19a.

At lateral positions on the outer peripheral surface of the rear frame 20 are protrusions 20d (see FIG. 2) and 20C similar to the protrusions 19b and 19c.
(See FIG. 3) are provided in a protruding manner, and the protrusions 20d and 20c are provided with bottle holes into which a pair of horizontal bottles 20a (see FIGS. 2 and 3) are rotatably inserted. .

As shown in FIG. 2, the bin 20a is installed on an arm 21d that projects rearward from the rear surface of the front base plate 21 (only one bin 20a is shown in FIG. 2), and the rear frame 20 is It is supported by the front base plate 21 so as to be rotatable about the bin 20a (that is, about a horizontal axis perpendicular to the optical axis of the correction optical system). Note that, as shown in FIG. 3, a light receiving element support plate 28 is attached to the protrusion 20c to which the light receiving element 14, which is a component of the first detector 31, is fixed. Light receiving element 14
It also serves as a connector.

As shown in FIG. 3, a short arm 20b is protruded from the top end of the outer peripheral surface of the rear frame 20, and a shaft (not shown) of a second actuator 34 is fixed to the arm 20b. There is.

The second actuator 34 is a voice coil type electromagnetic plunger having the same structure as the first actuator 33, and includes a mounting cylindrical yoke 26 that is fitted and fixed into the hole 22b of the rear base plate 22, and a mounting cylindrical yoke 26 that is fixed inside the yoke 26. permanent magnet 24,
It has parts such as a pole piece 25 and a coil 23 fixed to the shaft. When the coil 23 is energized in the positive direction, the shaft is pushed forward in FIG.
Since the arm 20b of the rear frame 20 is pushed forward, the rear frame 20 is pushed forward.
(i.e., around the horizontal axis) in a clockwise direction.

In the variable apex angle prism device having the above structure, when at least one of the front frame 19'EL and the rear frame 2o is rotated about the bins 19a and 20a, respectively, the front glass plate 15 and the rear glass plate are rotated. 16 is tilted with respect to the vertical plane, the light rays incident on the front glass plate 15 are refracted, and as a result, the image on the imaging plane moves in a direction perpendicular to the optical axis, thereby compensating for image blur. It will be done.

Next, the structure and function of the detectors 31 and 32 will be explained with reference to FIGS. 1 to 3 again. In addition, detector 3
1 and 32 have the same structure, their constituent parts are labeled with the same numbers. The detectors 31'Et and 32 are angular displacement detectors of a type called a hydrostatic sensor. It functions as a servo detector to detect the amount of movement of the correction optical system.

1 to 3, 1 is a housing fixed to the front base plate 21 and the rear base plate 22, 2 is a cylindrical body sealed with a transparent liquid 3 and fixed to the housing 1, 4 is a cylindrical body fixed to the housing 1; 5 is an impeller-shaped floating body rotatably provided in the transparent liquid around a horizontal axis (in the case of the first detector 31); As clearly shown in FIGS. 2 and 3, each attached slit mirror 6' has a pivot shaft that rotatably supports the floating body 4, and is fitted into a groove in the inner circumferential wall of the cylindrical body 2. 7 is a floating body support member fixed to the cylindrical body 2; 7 is a yoke forming an electromagnet for guiding the wing-shaped portion of the floating body 4 to a predetermined position and keeping it stationary; 8 and 9 are yoke 7 of the yoke 7; A yoke is connected to both ends and whose ends are in contact with the outer circumferential surface of the cylindrical body 2, and 10 is an arcuate groove 10a into which a bottle 1a protruding from the inner wall surface of the housing 1 is inserted so as to be relatively slidable therein. (A circular arc groove centered on the axis 4a of the floating body 4) and a floating body localization device support base that supports a yaw hook or a yoke 9;
11 is a coil that is fitted into the yoke 7 and constitutes an electromagnet together with the yoke 7; 12 is attached to the housing 1 (an arm 12a connects the floating body localization device support 10 to the cylindrical body 2);
13 is a light emitting element (IRED) fixed to the housing 1; 14 is a front frame 19 and a rear frame 20 of the variable apex angle prism device as shown in FIG. 3; A light receiving element 29 is fixed to each of the light receiving element supporting plates 27 and 28 fixed to the light receiving element supporting plates 27 and 28, and a mask 29 is arranged in front of the light receiving element 14 and is fixed to the light receiving element supporting plates 27 and 28.

The yokes 7 to 9 and the coil 11 constitute a floating body positioning device for guiding the floating body 4 to a fixed position and making it stationary. When the coil 11 is energized, the yokes 7 to 9 and the coil 11 move from the yoke 7 to the yoke 8 to the floating body 4 to the yoke 9. →A magnetic circuit of the yoke 7 is formed, and the tip of the wing-shaped portion of the floating body 4 is attracted toward the position shown in FIG.

The floating body localization device support stand 10 has a pin 1a in an arcuate groove 10a.
By relatively moving the position of (i.e.,
By rotating the floating body localization device support 10 around the axis 4a of the floating body 4, the relative position with respect to the cylindrical body 2 can be changed, and therefore the position of the tips of the yokes 8 and 9 with respect to the cylindrical part 2 can be changed Can be changed. A gear portion tab is formed on the outer peripheral edge of the waist plate 10 in order to rotate the floating body localization device support base 10, and the support base 10 can be rotated by rotating a gear (not shown) meshing with the gear portion 10b. It can be rotated.

The light-receiving element 14 is constituted by a known semiconductor device detection element (PSD), and the light-receiving element support plates 27 and 28 also serve as connectors for transmitting the output of the light-receiving element to a detection circuit to be described later.

The detectors 31 and 32 detect the shake (angular displacement) of the optical device according to the following principle. That is, when the optical device moves around the horizontal axis or the vertical axis, the cylindrical body 2, the light emitting element 13, and the light receiving element 14 that are integrated with the optical device also rotate around the horizontal axis or the vertical axis together with the optical device. However, due to the inertial force of the transparent liquid 3 within the cylindrical body 2, the floating body 4 does not rotate about the axis 4a and remains at its original position. Therefore, the mirror 5 attached to the floating body 4 is moved once relative to the light emitting element 13 and the light receiving element 14, and as a result, the direction of the light incident from the mirror 5 to the light receiving element 14 changes. , an output representing the rotational position of the optical device is generated at the light receiving element 14.

The function of the floating body localization device consisting of the coil 11 and the yokes 7 to 9 is to position the arm 4 of the floating body 4 before the detectors 31 and 32 start operating.
In other words, the detector is reset by positioning the floating body 4 at the initial position.

That is, in the detector, the coil 11 is energized immediately before the start of the measurement operation of the detector, and a magnetic circuit of yoke 7 → yoke 8 → floating body 4 → yoke 9 → yoke 7 is formed, and as a result, the floating body 4 is positioned at the ";position" shown in FIG. 2, and the detector is reset.

FIG. 4 is a diagram showing a schematic configuration of an electrical control device included in the image blur correction device of this embodiment. The control device includes various circuits related to the light emitting element 13 and the light receiving element 14 in the detectors 31 and 32, and the detectors 31 and 32.
A circuit for controlling the electromagnet of the floating body localization device, a circuit for controlling energization of the coil of the correction optical system actuator, and a microcomputer (hereinafter referred to as CPU) 56 for controlling the various circuits mentioned above are included.

In FIG. 4, 14a and 14b are two diodes constituting the light receiving element 14. When light enters the light receiving element 14 from the light emitting element 13, an output voltage A is generated from the diode 14a, and an output voltage A is generated from the diode 14b. An output voltage B is generated. (In Fig. 4, the light receiving element 14 is modeled and displayed as two diodes, and in reality a publicly known PSD is used, but the output of the PSE) also depends on the incident light on it. There are two outputs A and B representing the position of the light. ) 52 is a detector-B circuit including an addition/subtraction circuit and a division circuit, and generates a signal representing A+B as an output. Note that the output (A+B) is the total output of the light-receiving element 14, and the output (A-B) represents the incident position of the light beam on the light-receiving element 14, and also indicates whether the correction optical system is tracking the detector. It represents.

58 is a light emitting element drive circuit for controlling the current of the light emitting element 13, and 57 is a communication circuit for the coil 11 of the electromagnet for floating body localization. i
An electromagnet drive circuit controls the f current; 60 is a start switch for the image blur correction device; and 53 is an actuator drive circuit that controls energization of the coils 23 of the actuators 33 and 34.

FIG. 5 is a flowchart of a program executed by the CPU 56 of FIG.

FIG. 6 is a diagram showing various states of the correction optical system 30 and the detector 32.

The operation of the image blur correction apparatus of this embodiment will be explained below with reference to FIGS. 1 to 6. Note that before the image blur correction device starts operating, the detector 32 and the correction optical system 30 are in the sixth position.
Assume that it is stationary in the state shown in Figure (a).

In FIG. 4, when the switch 6o is turned on, the CPII
56 operates its own built-in timer as shown in FIG. 5, and then operates an electromagnet drive circuit 57 that is interlocked with the timer. For this reason, the detectors 31 and 32
The coil 11 of the electromagnet inside is energized, and the coil 1! The energization continues until the timer ends its operation. When the coil 11 is energized, the yokes 8 and 9 are magnetized, so the wing-shaped portion of the floating body 4 is moved to a position where it is aligned with the tips of the yokes 8 and 9, and then aligned with the tips of the yokes 8 and 9. It stops at the position shown in Figure 2, and as a result,
The detectors 31 and 32 are reset. At this time, if there is no vibration in the optical instrument about the horizontal or vertical axis, the light emitting elements 13 in the detectors 31 and 32
The postures of the light receiving element 14, the mirror 5, and the variable apex angle prism device of the correction optical system are as shown in FIG. 6(a). In addition, in FIG. 6, 4o is a photographing lens of the optical device, 41 is an imaging plane of the optical device, and parallel light beams a, b, c entering the variable apex angle prism device
focuses an image on a point P on the optical axis on the imaging plane 41.

After the detection devices 31 and 32 are reset as described above,
The CPO 56 drives the light emitting element drive circuit 58 to cause the light emitting element 14 to emit light. At this time, if the optical device does not shake as described above, the relative positional relationships among the light emitting element 13, mirror 5, and light receiving element 14 are in the initial state as shown in FIG. 6(a), so the correction optical system is driven. Not done.

When the optical device shakes (rotates) from the initial state, for example, about the vertical axis, the cylindrical body 2 of the detector 32
is rotated together with the optical device about the axis of the floating body 4, but the floating body 4 remains at its original position without moving due to the inertia of the liquid 3 within the cylindrical body 2, and as a result, the light emitting element 13 and The relative position with the mirror 5 changes, and the light receiving element 14 changes from the mirror 5.
(The position of the incident light beam also changes).

FIG. 6(b) shows the above state,
The optical device is in a state where it has been rotated around the vertical axis (the axis parallel to the pin 19a), and therefore the imaging lens 40 and the imaging surface 41 are also tilted, and the image on the imaging surface 41 is at the initial imaging position. When the image moves from P to position Q, so-called image blur occurs. At this time, since the incident position of the light flux from the mirror 5 to the light receiving element 14 is changing, output signals A and B are generated at both ends of the light receiving element 14, respectively, and these output signals are input to the actuator drive circuit 53. , the actuator 33 is excited, and the front frame 19 of the correction optical system 30 is connected to the pin 1.
9a as the center, for example, as shown in Fig. 6(c) (
When a state like D occurs, the parallel rays M~C incident on the variable apex angle prism are refracted, and the image formed by the photographing lens 40 is focused on a point -, thereby correcting image blur. In this case, when the front frame 19 of the correction optical system 3° is rotated around the pin 19a, the light receiving element 14 in the detector 31, which is integrated with the front frame 19, is also rotated around the pin 19a. Therefore, the position of the incident light flux from the mirror 5 to the light receiving element 14 also changes, and the output of the detection circuit 52 decreases as the amount of rotation of the front frame 19 increases, and the movement of the correction optical system
is mechanically fed back. And the detection circuit 5
When the output of No. 2 becomes zero (ie, IA-Bl-0), the actuator drive circuit 53 stops operating, and the actuator 33 also stops operating.

7 and 8 show modified embodiments of the detectors 31 and 32. In this embodiment, the correction optical system is configured by the same variable apex angle prism device as in the first embodiment, so the explanation regarding the correction optical system is omitted, and the constituent members of the correction optical system are the same as those in FIGS. 1 to 3. It is indicated by a symbol.

This embodiment is equipped with a detector 32A (only one detector will be explained) having a different structure from that of the first embodiment.

The detector 32A of this embodiment is the same hydrostatic sensor as the detectors 31 and 32 of the first embodiment, but uses photoelectric conversion as a detection element for detecting relative position changes between the floating body 4 and the cylindrical body 2. The detector differs from the first embodiment in that it incorporates a semiconductor magnetoresistive element 301 instead of an element.

The semiconductor magnetoresistive element 301 is supported by the element support plate 29 between the tip 9a of the yoke 9 and the arm 4b of the floating body 4 placed opposite thereto.

When the arm 4b of the floating body 4 is aligned with the tip 9a of the yoke 9 as shown in FIGS. 7 and 8(a), the magnetic field of the yoke 7 - yoke 9 - floating body 4 → yoke 8 → yoke 7 is generated as described above. A circuit is formed.4 At this time, as shown in FIG. 8(a), the magnetic flux J passes through the center of the semiconductor magnetoresistive element 301, so that the magnetic flux J passes through the center of the semiconductor magnetoresistive element 301, so that the magnetic flux J passes between the central terminal 301c of the element 301 and the terminals 301a and 301b at both ends. (301c and 301
(resistance between 301c and 301a)
are equal, and the output of the secondary detection circuit 52 becomes male.

However, when a relative positional change occurs between the floating body 4 and the yoke 9 as shown in FIG. 8(b), the magnetic flux J shifts from the center of the semiconductor magnetoresistive element 301 toward the terminal 301a.
The electrical resistance between the terminal 301c and the terminal 301a increases and the electrical resistance between the terminal 301c and the terminal 301b decreases, so that an output is generated in the detection circuit 52.

9 and 10 show modified embodiments of the correction optical system. In this example, the hydrostatic sensor with a built-in photoelectric conversion element shown in FIGS. 1 to 3 is used as a detector. is displayed.

The correction optical system of this embodiment is not a variable apex angle prism device as in the first embodiment, but is constructed as a cantilever type correction optical system.

In FIG. 9, reference numeral 203 denotes a Y flat lens holding frame that holds the correction lens 205;
03 is cantilevered at the tip of a four-piece flexible support rod 204 arranged parallel to the optical axis of the lens 205. The flexible support rod 204 has a core made of a metal rod or metal wire, and the outside of the core is covered with an elastic and stretchable material such as rubber, and the rear end of the support rod 204 is made of a metal rod or wire. is fixed to the main body frame 201 of the optical device.

Since the tip of the support rod 204 can bend in a direction perpendicular to the optical axis, the lens holding frame 203 can also move in a direction perpendicular to the optical axis.

A notch is formed in the center of two sides of the lens holding frame 203, and a coil 213 and a yoke 212 of an actuator 211 for horizontal driving are arranged in one of the notches. The coil 209 of the actuator 210 for vertical driving and the yoke 20B are arranged in the other one. The coils 213 and 209 of each actuator 211 and 2LO are fixed to the lens holding frame 203 via a winding frame. On the other hand, the yokes 206 and 212 of each actuator are fixed to a stationary structural member such as the optical device main body frame 201, and have an E-shaped cross section as shown in FIGS. 9 and 10.

Yoke 206 includes a central piece inserted into coil 209;
It has an outer piece arranged parallel to the outside of the coil 209, and permanent magnets 207 and 208 are fixed inside the outer piece as shown in FIG. Each actuator 210 and 211 is composed of the yoke, a permanent magnet, and a coil, and the coil 209 and 21
By energizing each of 3, the lens holding frame 20
3 can be driven vertically or horizontally.

A light receiving element 14 included in the detector 31 is fixed to the back surface of the lens holding frame 203, and the reflected light from the mirror 5 attached to the floating body 4 enters the light receiving element 14. .

Note that the electrical components of the image blur correction device of this embodiment are the same as those shown in FIG. 4, and therefore illustration thereof is omitted.

FIG. 10 shows various states of the image blur correction device having the mechanical structure shown in FIG. 9.

FIG. 10(a) shows a state in which there is no blurring in the optical device, and at this time, the imaging plane 202, lens 205, and lens holding frame 203 of the optical device are aligned with a vertical plane perpendicular to the lens optical axis. The light beams are parallel to each other, and the light beam that is incident on the light receiving element 14 from the mirror 5 of the floating body 4 is incident on the center of the light receiving element 14. Therefore, the outputs A and B generated at both ends of the light receiving element 14 are equal, and the output of the detection circuit 52 is a drop. In addition, the parallel light rays a-c incident on the lens 205 form an image at the center P of the imaging plane 202, and no image blur occurs.

FIG. 10(b) shows a state in which the optical device is rotated clockwise about the horizontal axis (the axis perpendicular to the plane of the paper in FIG. 10), and at this time, the imaging plane 202 and the lens 2
05 and the lens holding frame 203 are also rotated together with the optical device, the parallel rays a to C incident on the lens 205 are focused on a point Q on the image forming plane 202, resulting in image blurring. At this time, since the floating body 4- in the detector 31 remains at the position shown in FIG. The light is incident at a position off the center, and as a result, outputs A and B at both ends of the light receiving element 14 are no longer equal, and outputs A and B are generated in the detection circuit 52.

A+B Therefore, the actuator drive circuit 53 supplies the current corresponding to the output of the detection circuit 52 to the coil 2 of the actuator 210.
09 to drive the actuator 210. When the coil 209 is energized, a downward force parallel to its own axis is applied to the coil 209 due to the interaction between the current in the coil 209 and the magnetic fields of the permanent magnets 207 and 208, so that the lens holding frame 203 The lens 205 is moved downward in a direction perpendicular to the optical axis of the lens 205 from the position shown in FIG. Deflect. Then, the lens 205 and the lens holding frame 203 are attached as shown in FIG.
), the parallel ray a y c @ image that enters the lens 205 moves from point Q to point P, and as a result, image blur correction is performed. When the lens 205 and the lens holding frame 203 are lowered to the position shown in FIG. 10(C), the reflected light from the mirror 5 enters the center of the light receiving element 14 again, and as a result, the output of the detection circuit 52 becomes τ and is activated by the actuator. The power supply to the coil 209 of 210 is stopped. and,
When the image blur correction is completed, a shutter mechanism (not shown) is operated to expose the image plane to light, and photographing is completed.

Note that although a hydrostatic sensor is used as a detector in the image blur correction apparatus of the present invention described above, it is clear that a detector other than a hydrostatic sensor can also be used as a detector.

[Effects of the Invention] As explained above, the image blur correction device of the present invention does not have a detector for detecting the amount of movement of the correction optical system, and the blur detector for detecting the movement of the optical equipment, etc. is used in the correction optical system. Since the output is reduced according to the operation of the image stabilizing device, it is smaller than the conventional image blur correction device and can be manufactured at a lower cost than the conventional device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the mechanical structure of the image stabilization device according to the first embodiment of the present invention, viewed from the front, and FIG. 2 shows the main parts of FIG. FIG. 3 is a view from below, with the correction optical system 30, detectors 31 and 32, and actuators 33 and 34 for driving the correction optical system taken out from the mechanical structure shown in FIGS. 1 and 2. 4 is a schematic diagram showing the electrical components included in the image blur correction device of the present invention. FIG. 5 is a flowchart of the program executed by the CPU 56 shown in FIG. 4. FIG. 6(a) is a diagram showing the state of the image stabilization device when it is not in operation, and FIG. 6(b) is a diagram showing the state in which the image stabilization device is not in operation. Figure 6(C) is a diagram showing a state where image blurring occurs on the imaging plane. Figure 6(C) is a diagram showing a state when image blurring is corrected from the state of Figure 6(b). Figure 7 is a view of the device according to the second embodiment of the present invention seen from below in the same state as in Figure 2; Figure 9 is a perspective view of the main parts of the device according to the third embodiment of the present invention seen from the front; Figure 111 is a diagram showing various states of the device according to the third embodiment; FIG. 2 is a diagram showing the configuration and control system of the blur correction device. 1... Detector housing 2... Cylindrical body 3... Transparent liquid 4... Floating body 5... Mirror
6... Floating body support members 7 to 9... Yoke 10 (of the electromagnetic stone for floating body localization) 10... Floating body localization device support stand 11... Coil 12 (of the electromagnetic stone for floating body localization)...
- Leaf spring 13...Light emitting element 14...Light receiving elements 15 and 16...Glass plate 18...Transparent liquid 19...(Correction optical system) Front frame 2o...(Correction optical system) ) Rear frame 21... Front base plate 22 (for supporting the correction optical system)...
Rear base plate 7 and 28 (for supporting the correction optical system)...Light receiving element support plate O...Correction optical system 1...First detector 32...Second detector 3 and 34...・・Actuator for driving the correction optical system '212 ・・Body frame of optical unit 1 etc. ・・Imaging surface 203 ・・Lens holding frame・・
・Flexible support rod 205...Correction lens...
Yoke of actuator 210 and 208...Yoke of actuator 210...
Coil of actuator 210 Actuator Yoke of actuator 211 Coil of actuator 211 Semiconductor magnetoresistive element and 4 others Figure 3 Figure 4 Figure 5 Figure 7 (b) Figure 9

Claims (1)

[Claims] 1. A detector for detecting blur of an optical device, and a correction optical system for correcting image blur on an image forming plane of the optical device, and the detector has a detector that detects a blur of an optical device, and a correction optical system for correcting image blur on an image forming plane of the optical device, and the detector has a Image blur correction characterized in that the output is reduced in conjunction with the correction optical system, and the detector also has a function as a detector for the amount of operation of the correction optical system. Device.