JPH02120822A - Image blur correcting device - Google Patents

Abstract

PURPOSE:To discriminate states of a correcting optical system and detectors with a small-size and low-cost image blur correcting device by constituting the device so that the device can generate outputs corresponding to the position of the correcting optical system in a correctible extent. CONSTITUTION:When a correcting optical system is moved, a light receiving element 14 which is a component of detectors 31 and 32 is also moved together with the optical system. Outputs of the detectors 31 and 32 are reduced as the optical system is moved and the element 14 is moved to its initial position. A discrimination circuit 64 discriminates the position of the optical system at that time from the outputs of the detectors 31 and 32. When the circuit 64 discriminates that the optical system is near the boundary of its image blur correctible extent, the circuit 64 changes restoring operations of the detectors and again positions the optical system by increasing the current supplying quantity to the coil 11 of an electromagnet for fixing floating body. Therefore, this image blur correcting device can be reduced in size and cost.

Description

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

[Prior Art] Recently, various proposals regarding image blur correction devices to be mounted on still cameras have been made, 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 cancel 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. 14, the correction optical system movement amount detector represents the servo detector.

[Problems 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 a correction device detects the amount of movement of a correction optical system. Since the optical system and the movement amount detector must be mounted on the equipment, there is a drawback that the equipment and equipment are large in size, and the electronic circuit is also complicated due to the complicated control system. 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 prevention device that can make each optical device equipped with an image blur correction device small in size and at low cost.

[Means for Solving the Problems] The present invention provides an image stabilization system in which a blur detector for detecting blur in an optical instrument, etc. has a function as a correction optical system movement amount detector for detecting movement amount of a correction optical system. The present invention is characterized by the configuration of a blur correction device, and 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.

Further, in the present invention, since the shake detector is configured to generate an output corresponding to the position within the correctable range of the compensation optical system, the state of the compensation optical system and the detection can be determined from the output of the shake detector. The state of the device can be determined, and the correction optical system can be given an operation suitable for a position within the correctable range.

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 in accordance with the amount of movement of the correction optical system. Further, the blur detector is configured such that its output changes in accordance with the position within the correctable range of the correction optical system. In the embodiment shown below, the blur detector has a light emitting element and a light receiving element,
A mask having an opening corresponding to the size of the correctable range of the correction optical system is arranged in front of the light receiving element.

Further, the image blur correction device is provided with a determination circuit that determines the position of the correction optical system and the detector from the output of the detector, and a restoring means driven by the output of the determination circuit restores the detector. The operation is controlled and the correction optical system is repositioned.

[Function] When the detectors 31 and 32 that detect the blur of the optical equipment generate outputs corresponding to the blur determination of the optical equipment, 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 light receiving element 14 is moved toward the initial position. Detectors 31 and 3
The determination circuit (64, 124) determines the current position of the correction optical system from the output of 2, and when it is determined that the correction optical system is close to the limit position of the image blur correction range, the detector 31 By increasing the amount of current applied to the coil 11 of the floating body localization electromagnet 32, the restoring operation of the detector is changed, thereby repositioning the correction optical system.

[Example] The present invention will be described in detail below with reference to FIGS. 1 to 13.

FIG. 1 is a perspective view of the mechanical structure of the image stabilization device of this embodiment seen from the front, and FIG. 2 is a perspective view of the main part of the device shown in FIG. 1 cut along a horizontal plane and viewed from below. Figure 3
This figure 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. 1.

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 a correction optical system driving actuator, which will be described later, and are fixed in an optical device such as a camera.

The front base plate 21 is provided with an optical path hole 21a and a hole 21b for supporting the correction optical system driving actuator 33.
The rear base plate 22 is also provided with an optical path hole 22a (see FIG. 2) and a hole 22b for supporting an actuator 34 for driving the correction optical system. In addition, the front base plate 2
1 and the recess formed on one side edge of the rear base plate 22 has a first
A second detector 32 (
See also Figures 2 and 3. ) is installed. 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 first two
The second detector 32 has the same structure as the first detector 31, but is arranged downward in order to detect the rotational displacement of the optical device about the vertical axis. Note that the detectors 31 and 3
The structure and function of 2 will be explained later.

A correction optical system 30 constituted by a variable apex angle prism device shown in FIGS. 2 and 3 is disposed in the space formed between the front main plate 21 and the rear main plate 22, and the correction optical system 30 is supported by the front base plate 21 and the rear base plate 22.

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 IS fixed to the front frame 19, and an annular front glass plate IS fixed to 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 that are fitted at both ends to 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. It is composed of various elements such as a transparent liquid 18 (see FIG. 2).

As shown in FIG. 3, protrusions 19b and 19ch are formed at the top and bottom sides of the outer peripheral surface of the front frame 19, each having a bottle hole for rotatably inserting a vertical bottle 19a. 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 arms 21C (only the lower arm 21c is shown in FIG. 2, but another arm 21c is also provided on the upper side) protrudes from the upper side. That is, the front frame 19 is rotatably attached to the front base plate 2 about the bin 19a.
1 is supported.

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 Figure 3) has a short arm 19d projecting to the right (see Figure i2. This arm 19d is similar to the arm 20 of the rear frame 20 shown in Figure 3).
It has the same shape as b. ), and as shown in FIG. 2, a shaft 33a of a first correction optical system driving actuator 33 (hereinafter referred to as a first actuator) is fixed to the nucleus 19d.

The first actuator 33 is a so-called voice coil type electromagnetic plunger, and includes a cylindrical yoke 26 fitted and fixed in the hole 21b of the front base plate 21, a permanent magnet 24 fixed in 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. In the actuator 33, when the coil 23 is energized in the positive direction, the shaft 33a moves rearward due to the electromagnetic force generated between the permanent magnet 24 and the coil 33, and the front frame 19 is rotated about the pin 19a. perform the action of

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 protrudingly, and the protrusions 20d and 20
c is provided with a pin hole into which a pair of horizontal pins 20a (see FIGS. 2 and 3) are rotatably inserted. The bin 20a is attached to the front base plate 21 as shown in FIG.
It is implanted in an arm 21d that protrudes rearward from the rear surface (only one pin 20a is shown in FIG. 2), and the rear frame 20 is centered around the bin 20a (that is, the correction optical It is supported by the front base plate 21 so as to be rotatable (about a horizontal axis perpendicular to the optical axis of the system). 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. It also serves as a connector for the element 14.

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 core 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 bottomed cylindrical yoke 26 that is fitted and fixed in the hole 22b of the rear base plate 22, and a 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 moved forward in FIG.
The rear frame 20 is pushed forward by the arm zob of the bottle 20a.
(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 and the rear frame 20 is rotated about the pins 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 to compensate for image blur. be exposed.

Next, the structure and function of the detectors 31 and 32 will be explained with reference to FIGS. 1 to 3 again. Note that the detector 31
Since 32 and 32 have the same structure, their components are indicated by the same numbers. The detectors 31 and 32 are angular displacement detectors of a type called a hydrostatic sensor, and the image stabilization device of the present invention detects shakes of optical equipment (rotational displacement around the horizontal axis and rotational displacement around the vertical axis). ) and functions as a servo detector for detecting the amount of movement of the correction optical system.

In FIGS. 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 transparent liquid 3 and fixed to the housing 1, and 4 is a cylindrical body fixed to the housing 1. An impeller-shaped floating body is rotatably provided in the transparent liquid around a horizontal axis (in the case of the first detector 31), and 5 is attached to each of the four outer peripheral surfaces of the rectangular cylindrical bearing part of the floating body 4. As clearly shown in FIGS. 2 and 3, the attached slit mirror 6 has a pivot shaft that rotatably supports the floating body 4 and fits into a groove in the inner peripheral wall of the cylindrical body 2. A floating body support member fixed to the cylindrical body 2; 7 is a yoke constituting a weight for guiding the wing-shaped portion of the floating body 4 to a predetermined value and making it stationary; 8 and 9 are the yokes of the yoke; A yoke 10 is coupled to both ends and whose end portions are in contact with the outer circumferential surface of the cylindrical body 2. Reference numeral 10 denotes 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. A floating body localization and righting device support stand 11 has an arcuate groove centered on the glaze 4a of the floating body 4 and supports the yokes 7 to 9, and the floating body positioning and righting device support stand 11 is fitted into the yoke 7 and carries a lightning stone together with the yoke 7. The coils 12 are attached to the casing 1 and are attached to the arm], 2 a is a leaf spring that biases the floating object positioning support 10 in the direction away from the cylindrical body 2; 13 is a plate spring that is attached to the casing 1; fixed light emitting device (IRED),
14 is a light receiving element fixed to each of the light receiving element supporting plates 27 and 28 fixed to the front frame 19 and rear frame 20 of the variable apex angle beamosm device as shown in FIG. 3; 29 is the front surface of the light receiving element 14; The light-receiving element support plate 2
7 and 28.

The yokes 7 to 9 and the coil 11 constitute a part of a floating body localization and righting 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 A magnetic circuit of floating body 4 - yoke 9 - beast 7 is formed, and the tip of the wing-like part of floating body 4 is attracted toward the position shown in FIG. 2 opposite to the tips of yokes 8 and 9, and at this position. Electromagnetically restrained.

- The floating body localization and righting device support 10 is constructed by relatively moving the position of the pin 1a in the arcuate groove 10a (that is, by rotating the floating body localization device support 10 around the axis 4a of the floating body 4). ) can change the relative position with respect to the cylindrical body 2, and therefore the position of the tips of the yokes 8 and 9 with respect to the cylindrical part 2 can be changed.

A gear portion 10b is formed on the outer peripheral edge of the waist plate 10 in order to rotate the floating body localization and righting device support base 10. The support stand 10 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 based on 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 rotated relative to the light emitting element 13 and the light receiving element 14, and as a result, the light receiving element 1
4, the direction of the light incident from mirror 5 changes, and the light receiving element 1
4, an output representing the rotational position of the optical device will be generated.

The first function of the floating body localization and righting device consisting of the coil 11 and the yokes 7 to 9 is to keep the wing-like portions of the floating body 4 stationary at the tips of the yokes 8 and 9 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,
A magnetic circuit of yoke 7 -> yoke 8 -> floating body 4 - yoke 9 - yoke 7 is formed, whereby the floating body 4 is positioned at the position shown in FIG. 2, and the detector is reset.

The second function of the floating body localization and righting device is to detect by the detector output that the correction optical system has reached the limit position of the correction operation range, and sometimes to restore the floating body to its initial position. to return the correction optical system to the center position of the correction operation range. Note that this second function will be explained later with reference to FIG. 6 and the like.

In order to cause the floating body localization restoring device to perform the second function as described above, a means for changing the amount of current applied to the coil 11 is formed in the electrical control device to be described later. The electrical control device included in the device will be explained later.

A horizontally long rectangular opening 29a is formed in the mask 29 disposed in front of the light receiving element 14.
Width of opening 29a (vertical dimension in Figure 2)
corresponds to the size of the correction operation range of the correction optical system. Therefore, when the correction optical system is moved to the limit position of the correction operation range, the light beam from the mirror 5 toward the light receiving element 14 passes through one edge of the aperture 29a and passes through the light receiving element 14.
At this time, a portion of the light beam is eclipsed by the edge of the aperture 29a, so the amount of light incident on the light receiving element 14 is reduced, and as a result, the output of the light receiving element 14 is reduced and the "correction optical The fact that the system is located at the limit position of the correctable range is detected from the output of the detector.

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 light receiving element 14 in the detectors 31 and 32, a circuit for controlling the electromagnet of the floating body localization and righting device in the detectors 31 and 32, and a coil of the correction optical system actuator. A circuit that controls the energization of
A microcomputer ((:P
(denoted as U) 56 is 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 a known PSD is actually used, but the output of the PSD also depends on the light incident on it. There are two outputs A and B representing the position.) 52 is a detection circuit consisting of an adder/subtractor circuit, which generates signals representing (A-B) and (A+8) as outputs.

The output (A+B) is the total output of the light receiving element 14, and the output (A+B) is the total output of the light receiving element 14.
A-B) represents the incident position of the light beam onto the light-receiving element 14, and also represents whether or not the correction optical system is tracking the detector.

The received light level detection circuit 61 is a circuit consisting of a known comparator, and is based on the reference level KVC set in the reference level setter 62 and the human input signal (A+) from the detection circuit 52.
B), the input signal (A+B) is at the reference level vC
When the value is lower than , the light emitting element miO circuit 5 generates an output.

63 is a light emission level detection circuit that detects the magnitude of the current flowing from the light emitting element driving circuit 58 to the light emitting element 13 and generates an output representing the detected value; 64 is an output of the light emission level detection circuit 63 and a light emission level to be described later; This is a determination circuit that generates an output corresponding to the difference from the storage level in the storage circuit 65 and determines the state of the correction optical system and the detector.

When the variable apex angle prism device is located at the center of the correction operation range, the light emission level storage circuit 65 stores the light emission level detection circuit 6 in response to a control signal from the Pt156.
It has the function of storing the output of 3. Reference numeral 60 denotes a start switch for starting the operation of the image blur correction device, and is also used as a power switch, a function switch, etc. of the optical equipment.

The circuit group consisting of the luminescence level infiltration circuit 63, the luminescence level storage circuit 65, the judgment circuit 64, and the electromagnet drive circuit 57, and the detector are designed to prevent large vibrations that exceed the correctable range of the correction optical system from being applied to the optical equipment. The floating object localization and restoring control means repositions the correction optical system by controlling the restoring operation of the detector when the optical device is moved or special imaging is applied to the optical device.

In addition, with respect to this floating body localization and restoring control means, the detection circuit 52 and the actuator drive circuit 53 constitute the main control means for the actuator.

FIG. 5 is a flowchart of a program executed in CPυ56 of FIG. Further, FIGS. 6 and 7 are diagrams showing various states of the detector 32 and the correction optical system 30.

The operation of the image blur correction apparatus of this embodiment will be explained below with reference to FIGS. 1 to 7.

In FIG. 4, when the switch 60 is retracted, CPυ5
6 operates its own built-in timer 1 as shown in FIG.
The drive circuit 57 is operated. Therefore, the coils 11 of the electromagnets in the detectors 31 and 32 are energized, and the coil 1
The power supply to timer 1 continues until the timer 1 ends its operation. When the coil 11 is energized, the yokes 8 and 9
is magnetized, the wing-like portions of the floating body 4 are connected to the yokes 8 and 9.
After being moved to a position aligned with the tips of the yokes 8 and 9, it stops at the position shown in FIG. 2 aligned with the tips of the yokes 8 and 9, thereby resetting the detectors 31 and 3z. At this time,
If there is no vibration about the horizontal axis or vertical axis in the optical equipment, the respective postures of the light emitting element 13 and the light receiving element 14 in the detectors 31 and 32, the mirror 5, and the variable apex angle prism device of the correction optical system. is in the state shown in FIG. 6(a). In FIG. 6, 40 is a photographing lens of the optical device, 41 is an imaging plane of the optical device, and the parallel light beams a, b, and c incident on the correction optical system 30 consisting of a variable apex angle prism device are An image is focused on a point P on the optical axis on the imaging plane 41.

After the detectors 31 and 32 are reset as described above, (
: The PII 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 light emitting element 13 and the mirror 5
Furthermore, since the relative positional relationship of the light receiving elements 14 is in the initial state as shown in FIG. 6(a), the correction optical system is not driven.

When the optical device shakes (rotates) around the horizontal axis or the vertical axis from the initial state, the cylindrical body 2 of either of the detectors 31 and 32 rotates with the optical device around the glaze of the floating body 4. However, the floating body 4 remains at the original position without moving due to the inertial force of the liquid 3 within the cylindrical body 2, and as a result, the relative position between the light emitting element 13 and the mirror 5 changes and the floating body 4 moves away from the mirror 5. The position of the light beam incident on the light receiving element 14 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 bin 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 moving from position P to position Q, so-called image blur occurs.

When the optical device shakes as shown in FIG. 6(b), the relative positional relationship between the mirror 5 and the light receiving element 14 changes, so the output (A-B) of the detection circuit 52 is no longer zero, so the actuator drive circuit 53 is driven according to the output (A-B) of the detection circuit 52, the coil 23 of the actuator 33 is energized, and the actuator 33 is driven.

When the actuator 33 is driven, ? Ii normal optical system 30 square frame 19 is rotated around the bin 19a,
Since the light receiving element 14 integrated with the front frame 19 is also rotated around the bin 19a, the relative positional relationship between the mirror 5 and the light receiving element 14 changes from the state shown in FIG. 6(b) to the state shown in FIG. 6(c). The shake detection output of the detector 32 (A-B)
decreases as the amount of rotation of the front frame 19 increases. Therefore, the human power applied to the actuator drive circuit 53 is also limited to the front frame 1.
The operating amount of the correction optical system decreases with the rotation of 9 and is mechanically fed back to the actuator drive (M).

When the front frame 19 of the correction optical system 30 is rotated, for example, to the position shown in FIG.
4, the output (A-B) of the detection circuit 52 also becomes positive at this time, so the drive of the actuator 33 is stopped, and therefore the rotation of the front frame 19 is also stopped. . At this time, the image of the parallel rays a- and -Q entering the correction optical system 30 is focused on a point P on the imaging plane 41, so that image blur correction has been performed.

Next, before explaining the function and necessity of the floating body localization and restoring means including the determination circuit 64 and the electromagnet drive circuit 57, a problem that occurs in an optical device equipped with an image blur correction device will be explained.

Generally, in an optical device such as a camera equipped with an image blur correction device, there is an inherent risk that image blur correction will not be performed properly in the following cases.

That is, when a camera or the like is actually used, the following situation is expected to occur.

(a) When the camera vibrates with a large amplitude that exceeds the correctable range of the correction optical system.

(b) When the camera continues to vibrate with a small amplitude near the center of the correctable range of the correction optical system, then shakes significantly, and then vibrates slightly at the position where the large shake occurred.

In the case of (a) above, the correction optical system performs correct correction within the correctable range, but as soon as the correction range is exceeded, correction becomes impossible. If we look at this as image shake on the imaging plane, the image that was stationary due to correction up to a certain point will shake significantly after that point, which will result in even more image shake. become.

Furthermore, since the image suddenly begins to shake after a certain point, when an image shake correction device is attached to a video camera, binoculars, etc., the viewer will feel uncomfortable.

On the other hand, in case (b) above, after the camera shakes significantly, the compensation optical system is located biased to one side of the compensation range, so the next time a large shake is applied, the compensation optical system is mostly located. Therefore, image blur correction cannot be performed normally in this case as well. Moreover, in this case, even though the correction optical system can hardly move, the actuator for driving the correction optical system continues to be energized, resulting in unnecessary power consumption and increased battery consumption. occurs.

Therefore, in order to prevent the image blur from expanding or the correction optical system not operating properly in cases like (a) and (b) above, the following measures should be taken. It becomes necessary. That is, in order to prevent sudden image blurring in the case (a), it is desirable to control the correction optical system so that the correction speed decreases as the correction optical system approaches the limit value of the correctable range.

On the other hand, in order to enable the correction operation of the correction optical system in case (b) above, after the first large shake occurs in the camera, the correction optical system must be adjusted in preparation for the next large vibration. It is desirable to slowly return to the center of the correctable range.

In the image stabilization device of the present invention, the above-mentioned floating body localization and restoring means is provided in order to give the above-mentioned operation (b) to the correction optical system, and the correction optical system is positioned close to the limit value of the correctable range. , the correction optical system is returned to its initial position by the floating body localization and restoring means.

That is, in the image blur correction device of the present invention, for example, when the correction optical system is stopped near one limit position of the correctable range as shown in FIG. By the following operations, the floating body is slowly returned to the initial position shown in FIG. 2, and thereafter, it is prepared to be able to normally perform the correction operation again.

Therefore, even in the case (b), image blur correction is always possible.

Therefore, in the present invention, the state of the correction optical system (such as the state where the correction optical system is near the limit of its correctable range) is determined from the change in the output of the light emitting element or the output of the light receiving element, and By controlling the correction optical system as described above based on the results, it is possible to correct image blur even when complex vibrations are applied to the optical equipment.

That is, as shown in FIG. 7, when the correction optical system has reached the limit position of the correctable range, the light beam from the mirror 5 toward the light receiving element 14 brushes the edge of the aperture 29a of the mask 29 and passes through the aperture 29a. As a result, the amount of light incident on the light receiving element 14 decreases, and the output (A+B) of the detection circuit 52 decreases. Therefore, since the input to the received light level detection circuit 61 decreases, the received light level detection circuit 61 generates an output to the light emitting element driving circuit 58 when the input is smaller than the reference level KVC, thereby driving the light emitting element 13. The current is increased. When the light emitting level detection circuit 63 detects the light emitting element drive circuit flow at this time, the detected value is input to the judgment circuit 64.
Now, the current state of the detector (i.e., the light receiving element 14, the light emitting element 13, and the mirror 5
(relative positional relationship with the corrective optical system 30) and the position of the correction optical system 30 are determined. Specifically, the determination circuit 64 produces an output when the correction optical system is located near the limit value of the correctable range or beyond the range, and otherwise outputs an output. Produces no output.

When an output is generated in the determination circuit 64, the electromagnet drive circuit 57 increases the current applied to the coil 11 of the electromagnet according to the output of the determination circuit 64, thereby moving the wing-shaped portion of the floating body 4 into the yoke 8.
As a result, the detector 32 is reset and the correction optical system 30 is returned to the center position of the correctable range. And the detector 32
is reset, the output of the detection circuit 52 (A
-B) becomes 0, so the power supply to the actuator 33 is also stopped.

FIGS. 8 and 9 are flowcharts of the electrical configuration and control program of an image blur correction apparatus according to a second embodiment of the present invention. Note that the mechanical structure of the image blur correction device of this embodiment is the same as that of the device of the first embodiment, so illustration thereof is omitted.

In FIG. 8, 120 is a CPU, 121 is a light emitting element drive circuit, and 122 is an output signal A and B of the light receiving element 14.
123 is a received light level recorder, ρ circuit, and 124 has the same configuration and function as the judgment circuit 64 shown in FIG. 4. A determination circuit having: Note that the circuit elements indicated by the same symbols as in FIG. 4 are the same as those in the first embodiment, and the various circuits mentioned above indicated by the same names as in FIG. The illustrated circuit is a circuit having the same function.

That is, the light emitting element drive circuit 121 is a circuit that operates to flow a constant current to the light emitting element 13, and the light reception level storage circuit 123 is a circuit that operates to cause a constant current to flow through the light emitting element 13. The judgment circuit 124 is a circuit that stores the current received light level output (A+B) when the level falls below the received light level (A+B) according to a signal from the CPU 120. The output (A+
B) is a circuit that generates an output to the electric filament drive circuit 57 when B) is smaller than a predetermined value with respect to the storage level.

This embodiment differs from the first embodiment shown in FIG. 4 in that the input data to the determination circuit 124 is obtained from the light receiving element related circuit, and the light emission intensity of the light emitting element 13 is
It is always kept constant by the light emitting element drive circuit 121. Therefore, in this embodiment, as shown in FIG. 7, the correction optical system 30 has its maximum operating range (correctable range).
is located near the limit value, a part of the light beam from the mirror 5 toward the light receiving element 14 is eclipsed by the edge of the aperture 29 of the mask 29, and as a result, the total output (A + B) of the light receiving element 14 is If the difference between the output (A+B) and the storage level of the received light level storage circuit 123 is smaller than a predetermined value, an output is generated from the determination circuit 124 and the electromagnet drive circuit 57
The current to coil 11 is increased by .

Note that the flowchart in FIG. 9 is the same as the flowchart in FIG. 5, so a description thereof will be omitted.

FIG. 10 is a diagram showing the electrical configuration of an image blur correction device according to a third embodiment of the present invention, and FIG. 11 is a flowchart of control operations executed in the configuration of FIG. 10. In addition,
In FIG. 10, circuit elements and circuits labeled with the same reference numerals as in FIG. 4 are the same as those shown in FIG. 4, and therefore their explanations will be omitted.

In this embodiment, the input to the determination circuit 131 is the detection circuit 5.
2 (A-B) output, and the judgment circuit 13
1, the reference signal to be compared with the detection circuit output (A-B) is set by the reference level 132, which is unrelated to the output of the light emitting element or the light receiving element.
This is different from the embodiments (FIGS. 4 and 8).

The first and second embodiments include a correction optical system and a light receiving element so that the light flux generated from the light emitting element 13 enters the center of the light receiving element 14 (that is, so that the output IA-Bl of the detection circuit 52 becomes zero). However, in reality, due to the delay in the control system, if control is performed so that l A - B l = O, there is a risk that it will take a long time to stop the operation. there were. Therefore, A-Bl=α
The control system is configured to control the movement of the correction optical system and the light-receiving element so that It is desirable that the settings enable quick control operations.

The present embodiment is constructed based on the above viewpoint, and the reference level 132 serving as the reference signal of the determination circuit 131 is
is the value of α above. Further, the reference signal in the received light level detection circuit 61 is set to a reference level 62 that is unrelated to the above-mentioned α.

In this embodiment, in the case of normal operation, the output IA of the detection circuit 52 is
-Bl does not exceed α, but as shown in FIG. 7, when the correction optical system 30 is driven to its maximum operating range (limit value of the correctable range), the output IA-Bl becomes α
As a result, an output is generated in the determination circuit 131, and the electromagnet drive circuit 57 causes the electromagnet to pass through the coil 11.
N, the current is increased.

Note that the control operation in this embodiment is almost the same as in the first and second embodiments, as can be seen from the flowchart in FIG. 11, so a description thereof will be omitted.

In the embodiment of the present invention shown above, the detectors 31 and 32
Although shown as an optical detector including a light transmitting element and a light receiving element, it is clear that any other type of detector may be used in place of the light transmitting element and the light receiving element. Also,
In the embodiment described above, when the correction optical system is at a position close to the limit value of the correctable range, the position of the correction optical system is controlled by changing the magnetic field for the floating body in the detector, but it is not possible to directly control the actuator. You may also do so.

Note that the optical equipment user may be informed of the state of the correction optical system by inputting the output of the determination circuit for determining the state of the correction optical system to a suitable display device. Furthermore, the mask is not limited to an optical mask, but may also be a magnetic mask or the like.

[Effects of the Invention] As explained above, in the image stabilization device of the present invention, the blur detector that detects the blur of an optical device, etc. is used as the compensation optical system movement amount detector that detects the amount of movement of the compensation optical system. Therefore, it is possible to make the image blur correction device smaller and lower in cost, and it is also possible to reduce the size and cost of the optical device. Further, since the image blur correction device of the present invention is configured to determine the state of the correction optical system from the operation of the blur detector and cause the correction optical system to perform an operation that passes through S/71, the optical Appropriate image stabilization is always possible even when complex vibrations occur, but when image blur correction is not possible, unnecessary power is not applied to the correction optical system actuator, resulting in unnecessary power consumption. There is no fear.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a perspective view of the mechanical structure of the image stabilization device of the present invention seen from the front, and FIG. FIG. 3 is a view of the device viewed from below, and shows 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. FIG. 4 is a diagram showing the electrical components of the image blur correction device according to the first embodiment of the present invention, and FIG. 5 is a diagram showing the control executed in the configuration shown in FIG. 4. Flowchart of operation, FIG. 6(a) is a plan view when the correction optical system is not driven and the detector 32 is in the initial position (non-operating state), FIG. 6(b) is the optical equipment FIG. 6(c) is a plan view showing the state of the detector 32 and the correction optical system 3o when the image forming surface is rotated around the vertical axis and image blur occurs on the imaging plane, FIG. 6(c) is similar to FIG. 6(b) FIG. 7 is a plan view showing a state in which the correction optical system 3o is rotated to perform image blur correction after the state described above has occurred, and image blur correction has been performed. FIG. FIG. 8 is a diagram showing the electrical configuration of the image blur correction device according to the second embodiment of the present invention, and FIG. 9 is the electrical configuration shown in FIG. 8. 10 is a diagram showing the electrical configuration of the image blur correction device of the third embodiment of the present invention, and FIG. 11 is a flowchart of the 11 control operations executed in the electrical configuration of FIG. 10. FIG. 12 is a flowchart of the control operation and is a block diagram showing a control system of a conventional image blur correction device. 1...Detector housing 2...Cylindrical body 3...Transparent liquid 4...Floating body 5...Mirror 6...Floating body support member 7=9
(of the electromagnet for floating body localization)...Yoke 10...Floating body localization device support stand 11...(of the electromagnet for floating body localization) Coil 12...Plate spring 13...Light emitting element 14...Light receiving element 19...Front frame 0 (of the correction optical system)...Back frames 5 and 16 (of the correction optical system)...Glass plate 8...Transparent liquid 1...(for supporting the correction optical system) Front base plate 3... Coil 2 (of the actuator for driving the correction optical system)... Rear base plate 0 (for supporting the correction optical system)... Correction optical system 7 and 28... Light receiving element support plate 9. ...Mask 31...First detector 2...
Second detector 3A and 34... Actuator for driving the correction optical system ¥3 Figure 4 Figure 10 Figure 11

Claims (1)

[Scope of Claims] 1. A detector for detecting blur of an optical device, a correction optical system for correcting image blur on an imaging plane of the optical device, and a correction optical system for correcting image blur on an image forming plane of the optical device, and a correction optical system for correcting image blur on an image forming plane of the optical device. and a control means for controlling the operation of the detector, and the detector includes an energy generating element and an energy sensitive element, and outputs a blur detection output according to the correction movement amount of the correction optical system. A mask having an opening corresponding to the correctable range of the correction optical system is provided in front of the energy sensitive element, and the correction optical system is configured to reduce the correction optical system based on the output of the detector. An image blur correction apparatus characterized in that the control means is provided with a determination means for determining at which position within the correctable range the system and the detector are located. 2. If the determining means determines that the detector and the correction optical system are located outside the correctable range or near the limit value of the correctable range, the detector and the correction optical system are returned to the initial position. 2. The image blur correction apparatus according to claim 1, wherein the control means is provided with a restoring means for restoring the image to a normal state.