JPH07218946A - Controller for preventing image blur - Google Patents

Abstract

PURPOSE:To prevent a blur detecting means and a flur preventive means from being unsuitably operated by predictively dealing with the generation of estimated factors leading to unsuitable operation of either the blur detecting means or the blur preventive means. CONSTITUTION:The real movement amount of an optical correction system 23 is detected by an optical correction system position detecting means 24, its output is compared with the output of an integrating means 6 by a comparing means, and a differential output between the amount of a blur detected with a blur sensor 5 and the displacement of the optical correction system 23 is amplified. The output of the differentially amplified result is inputted to an optical correction system driving means 25, driving power is supplied from the optical correction system driving means 25 to an optical correction system driving coil so as to eliminate the difference, and the optical correction system 23 is driven by a generated electromagnetic force. In this case, if the output per unit angle to be detected by the blur sensor and the output per unit correction angle of the optical correction system are set equal, a sufficient image blur preventive operation against camera-shakes is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image blur prevention device for preventing image blur of equipment such as a camera.

[0002]

2. Description of the Related Art Conventionally, as this type of image blur preventing device, as shown in FIG. 16, two vertical axes Y parallel to the film surface of the camera shown in FIG.
There are sensors 102 and 103 for detecting rotational shake around the axis and the P-axis, and after the outputs from both sensors are converted to predetermined signal levels by conversion circuits 104 and 105, respectively, correction optics is based on this output. The system 107 is driven in a predetermined direction to correct the image blur.

[0003]

However, in the conventional method, when the actual release sequence is started by operating the release button 101 of the camera as shown in FIG. 16, the mirror 10 is first used in the single-lens reflex camera.
After 6 is flipped up in the figure, the operation of the shutter unit 108 is started next, and the film surface is exposed. At this time, due to the impact force generated by the movement of the mechanical member such as the mirror and the shutter, an erroneous signal different from the actual camera shake or mechanical shake is generated in the sensors 102 and 103 described above. Therefore, if the signal from the sensor is input as a drive signal to the correction optical system 107 through the conversion circuits 104 and 105 without doing anything in this state, sufficient shake correction cannot be performed due to this erroneous signal during the actual exposure period. However, there was a drawback that the effect on the picture itself was very small.

[0004]

According to the present invention, at least one of shake detecting means for detecting image shake and shake preventing means for preventing image shake in response to the shake detecting means is inadequate. That the shake detection means and the shake prevention means actually cause an improper action, the occurrence of the factor is expected to occur directly or indirectly. Predicting means for predicting, coping means for coping with inappropriate operation of at least one of the shake detecting means and the shake preventing means in response to the predicting means, and the coping means for a predetermined time The present invention is characterized in that the image blur prevention performance is prevented from being deteriorated by the configuration thereof.

Further, according to the present invention, it is expected that at least one of the shake detecting means for detecting the image shake and the shake preventing means for preventing the image shake responds to the shake detecting means in an inappropriate manner. A prediction for predicting the occurrence of the factor described above, directly or indirectly, by at least one of the occurrence of the factor before the shake detection means and the shake prevention means actually perform an inappropriate action. Means for dealing with an inappropriate action of at least one of the shake detecting means and the shake preventing means in response to the fact that the factor actually occurs after the predicting means predicts the occurrence of the factor. The image blur prevention performance is prevented from being deteriorated by the configuration thereof.

Further, according to the present invention, it is expected that at least one of the shake detecting means for detecting the image shake and the shake preventing means for preventing the image shake responds to the shake detecting means in an inappropriate manner. A prediction for predicting the occurrence of the factor described above, directly or indirectly, by at least one of the occurrence of the factor before the shake detection means and the shake prevention means actually perform an inappropriate action. Means and a coping means for causing at least one of the shake detecting means and the shake preventing means to operate in a state different from a normal state in response to the predicting means. It is intended to prevent the prevention performance from deteriorating.

[0007]

【Example】

(First Embodiment) FIG. 1 is a block diagram showing the overall configuration of an image blur prevention device according to a first embodiment of the present invention. In FIG. 1, the CPU 1 simultaneously controls the entire camera and the image stabilization system. It is a control circuit composed of a microcomputer for controlling. The output of the shake sensor 5 for detecting the shake of the entire camera is directly input to the A / D converter 2 and the result of the integral calculation by the integrating means 6 is also A / D.
It is configured to be input to the D converter 2. FIG. 2 shows a concrete configuration of the sensor 5 and the integrating means 6.
Then, as the shake sensor, a vibration gyro utilizing Coriolis force or the like is used. In FIG. 2, the oscillator 50 is resonantly driven by the drive circuit 52 and the synchronous detection circuit 5
By 1, the signal level is converted into a signal level proportional to the angular velocity of the shake acting on the camera. Further, since this output signal contains a DC component unrelated to the normal shake signal, a high-pass filter including an OP amplifier 53, a capacitor 54, and resistors 55, 56 and 57 is provided to remove this component. Has been. The output of this OP amplifier 53 is shown in FIG.
It is input to the A / D converter 2 as shown in FIG. The output of this OP amplifier 53 is the OP amplifier 5
It is input to an integrating circuit composed of 8, resistors 59 and 61, and a capacitor 60, where the angular velocity is converted into angular displacement, which is input to the A / D converter 2 in FIG. In this way, the output of the shake sensor 5 and its converted output are converted into digital data by the A / D converter 2, and then C
It is taken into PU1 and a predetermined calculation is performed.

On the other hand, in FIG. 1, the actual amount of movement of the correction optical system 23 attached to a part or the front surface of the taking lens 10 is detected by the correction optical system position detecting means 24, and this output is output from the integrating means 6 described above. The output is compared with the comparison means 17, and the difference output between the shake amount detected by the shake sensor 5 and the displacement of the correction optical system 24 is amplified.

The output of the result of the differential amplification by the comparison means 17 is input to the correction optical system drive means 25, where the above-mentioned difference from the correction optical system drive means 25 to the correction optical system drive coil 2b. Drive power is supplied so that the correction optical system 2
3 is driven. Here, if the output per unit angle detected by the shake sensor and the output per unit correction angle of the correction optical system are set to be equal, a sufficient image shake prevention operation against hand shake can be realized. Incidentally, 9 is a means for detecting the focal length of the optical system by a known method, and 27 is a means for selecting whether or not to act the image blur prevention function.

Next, a concrete structure of the correction optical system 23 is shown in FIG. Correction optical system 2 shown in FIG.
3 shows the structure of a so-called shift optical system that decenters the optical path incident on the photographing optical system of the camera by shifting the lens in parallel in the xy directions perpendicular to the optical axis. In FIG. Generates electromagnetic driving force,
Reference numerals 82 and 83 denote coils forming a magnetic circuit unit that serves as a driving source in the x- and y-axis directions, and reference numerals 82 and 83 denote coils forming a pair with the yoke. Therefore, by supplying electric power to the coil portion from the correction optical system driving means 25, the lens 84 forming a part of the photographing lens is eccentrically driven in the illustrated x and y axis directions. Further, reference numeral 85 denotes a support frame and a support arm for fixing the lens 84, and the actual movement of the shift lens is performed by the iREDs 86 and 87 that move integrally with the lens and the lens barrel portion 90 that holds the entire shift lens. The non-contact detection is performed by the combination with the PSDs 92 and 93 attached to the. Further, 88 is a mechanical lock mechanism for holding the lens at the substantially optical axis center position when the power supply to the shift system is stopped, 89 is a charge pin, and 91 is a tilt stop for regulating the tilt direction of the shift system. Represents the supporting sphere as.

Next, the manner of operation control by the CPU 1 of this embodiment will be described with reference to the flowcharts of FIGS. 4 and 5 and the timing chart of FIG. First, in flow 200, it is determined whether or not SW1 (indicated by 18 in FIG. 1) is turned on by the release operation of the camera. If it is determined that this switch is turned on, the flow immediately proceeds to flow 201. move on. Here, as shown in FIG. 1, after the subject light incident through the correction optical system 23 and the photographing optical system 10 is reflected by the main mirror 11, it is passed through the sub-mirror 12 and the photometric system 13 to the photometric sensor 14 in the photometric means 14. Since the light is incident and an output corresponding to this light amount level is output through the photometric circuit in the photometric means, the CPU 1 takes this output into the CPU 1 via the A / D converter 2 as photometric data. Next, in a flow 202, calculation for determining a predetermined shutter speed and aperture value is performed based on this photometric data, and the result is stored in the RAM in the CPU 1.
Next, in the flow 203, the correction optical system 23 and the photographing optical system 1
The subject light incident through 0 enters the sensor of the distance measuring means 30 through the main mirror 11, the sub-mirrors 12 and 28, and the AF optical system 29, and is amplified to a predetermined level by the amplification circuit in the distance measuring means, Output A / D sequentially
It is taken into the CPU 1 via the converter 2. continue,
In flow 204, the defocus amount is calculated based on the result from the distance measuring means 30. In flow 205, it is determined whether or not the focused state is reached. When it is determined that the in-focus state has not been reached, the flow proceeds to flow 206, and the drive of the focus lens (included in the taking lens 10) based on the defocus amount described above is performed by the motor drive unit 7 and the focus drive motor. This is done by driving 8. As described above, the operations of the flows 203 to 206 are repeated until the focus reaches the in-focus state, and when it is determined that the focus is achieved, the flow proceeds to the flow 207. Next, in flow 207, SW2 (indicated by the switch 19 in FIG. 1) for the photographer to start the actual release operation is turned off.
It is determined whether or not N is ON, and if it is not ON yet, it is again determined in step 208 whether or not SW1 is ON. If the SW1 is not turned on, the camera operation is immediately stopped and the process proceeds to the flow 200. However, if the SW1 is still turned on, the flow 207 is performed again.
Then, the switch determination of SW2 is performed. When it is determined that the SW2 is in the ON state in the flow 207, the flow 2
09, where a control signal from the CPU 1 causes
Mirror drive motor 22 via mirror drive means 21
Energize to start the up operation of the mirror 11,
In the flow 210, the timer circuit inside the CPU 1 starts the time counting operation. This operation timing chart is shown in FIG. 6, and when the mirror drive is started, the mirror starts to move. Therefore, due to the mechanical action at this time, the sensor output shows the normal camera shake as shown in FIG. When compared with the components, a high frequency signal with a large amplitude appears. Since this signal naturally includes the shake of the camera body due to the above-described camera shake and the erroneous signal of the sensor itself caused by the impact, the waveform obtained by integrating this signal by the actual integrating means 6 is as shown in FIG. The sensor integrated output of No. 6 appears as shown by the solid line. As described above, since the correction optical system 23 is driven according to this output, the correction system output of the correction optical system position detecting means 24 also has a waveform as shown by the solid line in FIG. 6, which is more than the original shake. Correction will be performed. In order to prevent this operation, in the flow 211, the control output INTLVL of the CPU 1 is immediately set to the H level, and as a result, the analog switch 63 provided in the feedback section of the integrating circuit of FIG. The resistor 62 connected in series with is effective. Therefore, finally, the capacitor 60, the resistor 6
Since 1 and 62 are all in parallel, the time constant of the integrator changes, and the frequency characteristic of this integrator shifts to a characteristic such that the gain on the reduction side becomes smaller, as shown by the dotted line in FIG. I will do it. By switching the time constant of this integrator, the result of the actual integrated output changes as shown by the dotted line in FIG.
Naturally, the output displacement of the correction system also changes as shown by the dotted line, so that it is possible to minimize the influence of the sensor error due to the mirror-up shock as described above.
In the state where the time constant is still changed, in the flow 212, it is determined whether or not the above-mentioned mirror up is completed by determining whether or not the timer circuit inside the CPU 1 has reached the predetermined time T _M. When the determination is made and it is determined that the predetermined time T _M has been reached, it is considered that the mirror-up is completed, flow 213 stops energizing the mirror-up, and then flow 214 indicates CP.
Since U1 sets the INTLVL output to the L level, the analog switch 63 in FIG. 2 is turned off, and the integrator returns to the original frequency characteristic again. The predetermined time T _M is set to a time that is considered to be required until the mirror-up causes no influence. After that, when a predetermined time elapses, the flow proceeds to the flow 215 in which the shutter driving means 15
The shutter front curtain travel is started via. Even when the front curtain travels, a high-frequency waveform as shown in the sensor output of FIG. 6 is generated.
NTLVL is set to H level, and the frequency characteristic of the integrator is shifted to the high frequency side as in the case described above. In the flow 217, the counter value of the timer circuit inside the CPU 1 is once initially set. In the flow 218, it is judged whether or not this value has reached the predetermined time T _SF. Is set to the L level, whereby the frequency characteristic of the integrator is restored to the original state.
The predetermined time T _SF is set to a time that is considered to be required until the state in which the traveling of the shutter front curtain does not affect the state. After that, in Flow 220, it is determined whether or not the count value of the internal timer of the CPU 1 described above has reached the value T _AE corresponding to the shutter speed calculated in Flow 202, and when it is detected that this time has been reached Immediately, the flow proceeds to the flow 221, and this time the shutter drive means 15
Since the trailing curtain is started to travel through this, a high-frequency signal as shown in the sensor output waveform of FIG.
The INTLVL output of is set to the H level, and the frequency characteristic of the integrator is shifted to the high frequency side. In the flow 223, the counter value of the timer circuit inside the CPU 1 described above is reset again, and in the same way as in the case of the front curtain running, it is determined in the flow 224 whether or not the time of this timer has reached the predetermined time T _SR , _{When the SR} is reached, the INTLV is again performed in the flow 225.
L is set to the L level, whereby the characteristic of the integrator is returned to the original state. The predetermined time T _SR is set to a time that is considered to be required until a state in which the traveling of the shutter rear curtain is not affected. After that, when a predetermined time elapses, the flow of electricity to the front and rear curtains is stopped in flow 226, and then the flow of current to the mirror drive motor 22 via the mirror drive means 21 is performed in flow 227. In step 228, the timer circuit in the CPU 1 is reset again. Also in this case, as in the case described above, first in the flow 229, IN
When TLVL is set to H level, the characteristic of the integrator is once shifted to the high frequency side, and it is detected that the operation of the mirror down is completed by determining that the timing of the timer has reached Tm in Flow 230, the flow is detected. At 231 the energization of the mirror drive motor 22 is stopped, and finally at step 232 I
NTLVL is set to L level again, whereby the characteristic of the integrator is returned to the original level. Note that the predetermined time Tm is set to a time that is considered to be required until a state in which the mirror down has no effect.

Thus, in this embodiment, the mirror is moved up / down.
The frequency characteristic of the integrator is switched appropriately according to the timing of the down / shutter front / rear curtain traveling. The integrator characteristic depends on the output of the sensor.
It is also possible to switch to a plurality of stages above the stage. or,
Since the actual picture is affected only during the shutter control period, in some cases, the switching operation of the integrator when the mirror is up / down is omitted, and the integrator is switched only when the shutter is moving forward or rearward. Is also effective.

It is also possible to move the flow 211 before the flow 209 and the flow 229 before the flow 227 in FIG. Similarly, the flow 213 and the flow 214, the flow 215 and the flow 216, and the flow 221.
The flow 222, the flow 225 and the flow 226, and the flow 231 and the flow 232 may be replaced with each other.

Further, detection means for directly detecting the state of the mirror is provided, and in steps 211 and 229, the characteristics of the integration circuit are detected in response to the detection of the mirror up or down start by the detection means. May be changed.

Similarly, detection means for directly detecting the states of the shutter front and the rear curtain are provided respectively, and the flow 21 of FIG.
In 6 and 222, it is also possible to change the characteristics of the integrating circuit in response to the fact that each of the above-mentioned detecting means detects that the leading and trailing curtains have started running.

Further, the flow 211, 216, 222 of FIG.
It is also possible to switch to different integral characteristics in each case.

Further, in step 214 of FIG. 4, the integral characteristic is restored to the characteristic before the flow 211.
Here, the integral characteristic can be switched to an intermediate characteristic between the characteristic before switching and the characteristic after switching in the flow 211. The same can be done in steps 219 and 225 of FIG.

Further, instead of switching the integral characteristic, the characteristic of the high-pass filter is changed by changing the time constant of the high-pass filter composed of the capacitors 54, resistors 55, 56 and 57 of FIG. It is also possible to do so.

Further, the flows 211, 214 and 21 of FIG.
It is also possible to configure so that the respective integral characteristics changed in 6, 219, 222, 225, 229 and 232 are changed according to the shooting conditions such as the focal length and the shutter speed.

The above-described flow charts of FIGS. 4 and 5 correspond to the case where the shutter time is relatively long. For example, when the shutter time is shorter than a predetermined value, camera shake or the like is too much in the photographing result. This is applied when the image blur prevention is not performed because it does not affect, and the image blur prevention is set when the shutter speed is longer than a predetermined value.

However, when the image blur prevention is set to be performed even when the shutter speed is relatively short, the flowcharts of FIGS. 4 and 5 show that when the shutter speed is short (T _AE <T
_The exposure time will be incorrect for _SF ). Therefore, in order to cope with a relatively short shutter speed, it is possible to change the flows 218 to 220 of FIG. 4 to the flows 240 to 242 of FIG. 8 as a modification of the first embodiment.

Since this corresponds to a relatively short shutter speed, the timer value T _AE corresponding to the shutter speed is used.
Is shorter than the measured value T _SF in the flow 240.

Referring to FIG. 8, if the glyph value reaches T _SF in flow 240, the flow proceeds to flow 241, the integral characteristic is restored, and then flow proceeds to flow 242, while the measured value in flow 240 is T _SF. If not reached, the flow proceeds to flow 242. In the flow 242, if the measured value has reached T _AE , the flow proceeds to the flow 221, and if not, the flow returns to the flow 240.

That is, in the flow chart of FIG. 8, when T _SF > T _AE , even if the timer has not reached T _SF , the trailing curtain travel is started at the time when T _AE is reached, and the integration is performed. Regarding the time constant, the value for the shutter measure is maintained until the subsequent flow 225.

Further, when the shutter speed is relatively short, the influence of the mirror, the leading and trailing curtains on the photographing result of the shutter is small. Therefore, as a modification of the first embodiment,
In such a case, it may be considered not to change the characteristic of the shutter measure.

FIG. 9 shows a flowchart relating to the modified example, and the flow 215 of the flowchart of FIG.
And a flow 218 are provided between the flow 218 and the flow 216.
20 is changed to flows 240 to 242 (similar to FIG. 7), and further, a flow 251 is provided between the flows 221 and 222. The operation will be described with reference to FIG.

When it is determined in the flow 250 that the shutter speed T _AE is longer than the predetermined value T _th , the flow proceeds to a flow 216, and when it is determined that the shutter speed T _AE is shorter than the predetermined value T _th , the flow 216. The flow proceeds to flow 217 without passing through. The operations of the flows 216, 217 and 221 are shown in FIG. 4 and the flow 2
Since 40 to 242 are the same as those in FIG. 8, their description will be omitted here.

When it is determined in the flow 251 that the shutter speed T _AE is longer than the predetermined value T _th , the flow proceeds to flow 222, and when it is determined that the shutter speed T _AE is shorter than the predetermined value T _th , the flow is executed. 222 through 225, flow 22
Go to 6. Since the flows 222 to 226 are the same as those in FIGS. 4 and 5, the description thereof will be omitted here.

The predetermined value T _th is set to a value corresponding to the limit shutter time when it is considered that the effect of camera shake or the like will not affect the photographing result.

(Second Embodiment) Next, the operation of the image blur prevention device according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a block diagram showing the shake detection sensor shown in FIG. 2 and a part of its processing circuit,
The description from the vibration gyro 50 as the shake detection sensor to the feedback resistor 57 of the OP amplifier 53 is exactly the same as in FIG. In FIG. 10, the output of the OP amplifier 53 is connected to the input of the OP amplifier 70 via the analog SW 71 and the resistor 72, and the capacitor 73 is connected between the input end of the OP amplifier 70 and the ground. ing. Here, the analog SW 71 is controlled by an inversion control signal of the control signal LVLSET from the CPU 1 by the inverter 78, and the circuit configuration of the analog SW 71 and the capacitor 73 forms a sample old circuit. Further, the output of the OP amplifier 70 is input to an integrating circuit composed of an OP amplifier 74, resistors 75 and 76, and a capacitor 77, where the shake angular velocity output is converted into a predetermined shake displacement output.

Next, the flow of the control operation of the CPU 1 in this embodiment will be described with reference to the flowcharts of FIGS. 11 and 12 and the timing chart of FIG. Flows 300 to 309 in the flowchart of FIG. 11 are exactly the same as the flows 200 to 209 of FIG. 4, and therefore the description thereof will be omitted. When the up-driving of the mirror 11 of the camera body is started in the flow 309, immediately in the flow 310, as shown in FIG.
The A / D conversion of the sensor output which is the output of the OP amplifier 53 of 0 is started. In flow 311, it is determined whether or not this sensor output is greater than or equal to a predetermined value, and if the result is smaller than the predetermined value, LVLSET is set to L level in flow 312, whereby the analog SW 71 is turned on.

Therefore, in this state, the cutoff frequency of the low-pass filter composed of the resistor 72 and the capacitor 73 is set to a value sufficiently higher than the camera shake signal band, so that the output of the OP amplifier 70 is the output of the OP amplifier 53. Is exactly the same as the sensor output, and this output is converted into a predetermined displacement output by the integrating circuit in the subsequent stage.

On the other hand, when it is determined in the flow 311 that the sensor output is larger than the predetermined value, the flow proceeds to the flow 313, where LVLSET is set to H, whereby the analog SW71 is turned off this time. In this case, the operation of the capacitor 73 in the OP amplifier 70 causes
Since the level of the OP amplifier 53 immediately before the analog SW 71 is turned off is maintained, a constant signal level is output thereafter, and based on this output, it is converted into a predetermined displacement output by the integrating circuit in the subsequent stage. The above operation will be described with reference to FIG. 13. When the mirror is started, the sensor output shows a high-frequency high-vibration signal as shown in the figure. These values are the positive side predetermined level and the negative side predetermined level shown in FIG. When the voltage exceeds the level, the LVLSET by the CPU 1 becomes H, the hold operation of the sample hold circuit is performed, and a certain limiter acts on the sensor output. As a result, the sensor integrated output changes as shown by the dotted line in the figure, and as a matter of course, the displacement output of the correction system that operates to follow this sensor integrated output also changes as shown by the dotted line. It is possible to minimize the effect of sensor error due to mirror-up shock. Next, in flow 314, it is determined whether or not the mirror-up is completed,
If the mirror up is not completed, the above flow 3
The operations of 10 to 313 are repeated.

Further, when the completion of the mirror up is detected in the flow 314, the drive current for the mirror up is immediately stopped in the flow 315, and the control output LVLSET of the CPU 1 is forcibly set to the L level in the flow 316, whereby the analog output is completed. The SW 71 is turned on, and the normal integration operation for the sensor output is restarted thereafter. Then flow 31
After starting the front curtain running in 7 and starting the timer in flow 318, again in flows 319 to 322, the determination operation for the sensor output is performed in exactly the same manner as in flows 310 to 313, and thereby the predetermined value is set. The limiter operates for the above sensor output. In Flow 323, it is determined whether or not the time of the timer has reached the time T _AE corresponding to the shutter speed obtained in Flow 302, and when it is detected, the rear curtain running is started in Flow 324. . Once the timer is reset in the flow 325, the same determinations as those in the flows 320 to 323 are performed again in the flows 326 to 329. Therefore, in this operation, the sensor output is judged during the shutter exposure period. In flow 330, it is determined whether the timer value has reached the predetermined time T _SR, and when it is detected that the predetermined time has elapsed, flow 331 stops the front and rear curtain drive, and flow 332 forces LVLSET. The L level.

Next, in the flow of FIG. 12, the operation for mirror down is performed. First, in the flow 333, the mirror down drive is started, and in the flows 334 to 337, the process for removing the influence of the sensor error signal generated by the mirror down is executed just as in the above flows 310 to 313. In the flow 338, it is determined whether or not the mirror down is completed, and when the completion is detected, the flow 3
The drive of the mirror down is stopped at 39, and finally the flow 34
At 0, LVLSET is set to L level, and a series of operations is completed. As described above, in this embodiment, the influence of the sensor error is minimized by detecting the high-frequency large-amplitude signal generated at the sensor output when driving the mirror or the shutter and operating the predetermined limiter for this signal. It is the one.

As a modified example of this embodiment, a circuit (high-pass filter, circuit for processing the sensor output as in the first embodiment when the sensor output exceeds a predetermined value).
It is also possible to change the time constant of the integrating circuit).

Further, the flows 311, 320 and 3 in FIG.
It is also possible to set the respective predetermined values in 27 so as to be different from each other.

Similarly, the flows 311 and 32 shown in FIG.
It is also possible to change each of the predetermined values of 0 and 327 to a value suitable for the situation according to the shooting conditions such as the focal length and the shutter speed.

(Third Embodiment) FIG. 14 shows the third embodiment of the present invention.
2 is a configuration diagram showing a control circuit of a correction optical system used in the embodiment of FIG. 1, in which an OP amplifier 150 has an output from an integrating means 6 shown in FIG. 1 via resistors 151 and 152, respectively.
The position output from the correction optical system position detecting means is input, and a combination with the feedback resistor 153 constitutes a differential amplifier circuit for both inputs.

Further, the resistor 154 and the analog SW 155 are connected to the feedback section of this OP amplifier, and when the analog SW 155 is turned on by the control output from the CPU, the resistors 154 and 155 are connected in parallel. , The gain itself of this control system will be changed.

The output of the OP amplifier 150 is input to the phase compensation circuit composed of the resistors 157 and 158 and the capacitor 161, and the potential at the connection point of the resistors 157 and 158 is supplied to the OP amplifier 156. It is buffered and output to the correction optical system driving means. Here, the resistor 158 has a resistor 159 and an analog SW as shown in the figure.
Since 160 are connected in parallel, when the analog SW 160 is turned on by the control signal from the CPU 1, the resistance 1
Since 58 and 159 are connected in parallel, the phase compensation itself of the control system changes. In the actual release operation of the camera, as shown in the flow charts of FIGS. 4 and 5 as the first embodiment and FIGS. 11 and 12 as the second embodiment, the mirror up / down and the shutter tip / shutter are set. The control output from the CPU 1 changes at a predetermined timing such as the trailing curtain drive at a predetermined time or when the sensor output exceeds a predetermined value, and the drive characteristic of the correction optical system changes. FIG. 15 shows the timing waveform at this time, and the correction system output changes as shown by the dotted line with respect to the sensor integrated output, and the influence of the sensor error caused by the operation of the mirror and the shutter is reduced.

In each of the above-described embodiments, an example corresponding to the erroneous detection of the image blur detecting means which occurs according to the operation of the mirror or the operation of the shutter curtain is shown. However, other factors causing the erroneous detection, For example, it may be set so as to support film feeding and the like.

Further, regarding each embodiment or a combination of those technical elements, for example, regarding the determination of the motion that causes an impact, the determination of the mirror map is performed according to the external operation as in the first embodiment, and the shutter is released. It is also possible to set the curtain running determination according to the output of the image blur sensor as in the second embodiment. Also, various combinations are possible for the method of preventing the influence of impact (changing the characteristics of the integrating circuit or the high-pass filter, limiting the sensor output).

In each of the above-described embodiments, a vibration gyro, which is an example of an angular velocity meter, is used as the image blur detecting means, but another angular velocity meter, a displacement meter, an angular displacement meter, a speedometer, The image blur detecting means includes any accelerometers, angular accelerometers, and methods for detecting image shake itself, as long as the shake can be detected.

Further, in each of the above-mentioned embodiments, as the image blur preventing means, the one for deflecting the light flux by moving the optical member in the plane perpendicular to the optical axis to prevent the image blur is used. Deflection means, for example, a variable apex angle prism, or a means for correcting by image processing may be used.

Further, the present invention is a single-lens reflex camera as long as it has a factor causing an erroneous detection of the image blur detecting means,
It can be applied to any of a lens shutter camera, a video camera, and other optical devices.

When the present invention is applied to a lens shutter camera, for example, the operations for the shutter front and rear curtain running of each embodiment stop at the maximum opening position when the shutter changes from the closed state to the open state. It is set so as to be an action against an impact that occurs sometimes and an action against an impact that occurs when the shutter stops at a predetermined closing position when the shutter changes from the open state to the closed state.

Further, both the image blur detection means and the image blur prevention means may be provided in one device, or may be separately provided in two or more devices which form an image blur prevention system by being attached to each other. Good (for example, a camera is provided with image blur detection means, and an interchangeable lens is provided with image blur prevention means).

Further, even if the image blur prevention means prevents the image blur by correcting the image blur, a display, a sound, etc., indicating that the image blur has occurred or may occur However, even if the image blur is prevented from occurring as a result by alerting the user with the warning, and any image blur can be prevented, it is included.

The shake sensor 5 of FIG. 1 in each of the above-described embodiments corresponds to the shake detecting means of the present invention, and the correction optical means 23 of FIG. 1 corresponds to the shake preventing means of the present invention.

Further, a flow chart showing the operation of the CPU 1 Flows 207, 209, 215 and 22 of FIGS.
1, 227 or the flows 307 and 3 in FIGS. 11 and 12.
Reference numeral 09 corresponds to a prediction unit that indirectly predicts the occurrence of a factor in which at least one of the shake detection unit and the shake prevention unit according to the present invention is expected to perform an inappropriate action, and includes a mirror, a shutter tip, and a rear curtain. Directly detecting the motion corresponds to the predicting means for directly predicting the occurrence of the factor of the present invention.

Furthermore, the flows 211 and 21 of FIGS.
6, 222, 229, the flow 313 of FIGS. 11 and 12,
322, 329 and 337 correspond to the coping means of the present invention,
The clock circuit inside the CPU 1 corresponds to the clock means of the present invention,
Flows 311, 320, 327, and 33 of FIGS.
5 corresponds to the detecting means of the present invention.

The configuration of each of the above-described embodiments corresponds to the configuration of the present invention, but the present invention is not limited to each of the above-described embodiments, and the functions shown in each claim are achieved. If so, it is included in the present invention.

[0054]

As described above, according to the present invention,
At least one of the shake detection means and the shake prevention means causes a factor that is expected to perform an inappropriate action, for example, up of a mirror in a single-lens reflex camera,
Even when the shake detection means outputs an error signal different from the output corresponding to the shake due to down or movement of the shutter, by predicting and coping with the occurrence of the factor, the shake detection means and It has become possible to prevent the shake preventing means from acting inappropriately.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of an image blur prevention device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a specific configuration of a sensor and an integrating means in FIG.

FIG. 3 is a diagram showing a specific configuration of the correction optical system in FIG.

FIG. 4 is a flowchart showing an operation of the image blur prevention device shown in FIG.

5 is a flowchart showing an operation of the image blur prevention device shown in FIG. 1. FIG.

FIG. 6 is a timing chart showing the operation of the image blur prevention device shown in FIG. 1.

FIG. 7 is a diagram showing how the integration characteristic of the integrating means in FIG. 2 changes.

FIG. 8 is a flowchart showing a part of the operation of the image blur prevention device of the modification of the first embodiment.

FIG. 9 is a flowchart showing a part of the operation of the image blur prevention device of the modification of the first embodiment.

FIG. 10 is a diagram showing a part of the circuit configuration of an image blur prevention device according to a seventh embodiment of the present invention.

FIG. 11 is a flowchart showing the operation of the image blur prevention device of the second embodiment of the present invention.

FIG. 12 is a flowchart showing the operation of the image blur prevention device of the second embodiment of the present invention.

FIG. 13 is a timing chart showing the operation of the image blur prevention device of the second embodiment of the present invention.

FIG. 14 is a diagram showing part of the circuit configuration of an image blur prevention device according to a third embodiment of the present invention.

FIG. 15 is a timing chart showing the operation of the image blur prevention device of the seventh embodiment of the present invention.

FIG. 16 is a perspective view showing a configuration when the image blur prevention device is applied to a single-lens reflex camera and an interchangeable lens attachable to the camera.

[Explanation of symbols]

 1 CPU 5 shake sensor 6 integrating means 23 correcting optical system 25 correcting optical system driving means 53 OP amplifier 54 condenser 55, 56, 57 resistance

Claims (36)

[Claims] 1. At least one of a shake detecting unit for detecting image shake and a shake preventing unit for preventing image shake in response to the shake detecting unit is expected to have an improper action. Prediction means for predicting occurrence of a factor by at least one of direct and indirect occurrence of the factor before the shake detection means and the shake prevention means actually perform an inappropriate action. And a coping means for coping with an inappropriate action of at least one of the shake detecting means and the shake preventing means in response to the predicting means, and a clocking means for operating the coping means for a predetermined time. A control device for preventing image blur, which has. 2. The control device for preventing image blur according to claim 1, wherein the coping means has a varying means for changing the predetermined time in response to an exposure time. 3. The variable means changes the predetermined time so that when the predetermined time is longer than the exposure time, the action time of the coping means is until the end of the exposure. Image blur prevention device. 4. The predetermined time is set to a time required until an inappropriate action of at least one of the shake detection means and the shake prevention means caused by the occurrence of the factor is substantially ended. The control device for image blur prevention according to claim 1. 5. The control device for image blur prevention according to claim 1, wherein the factor is generated by a mechanical operation of a device which is an object of image blur prevention by the shake prevention means. 6. The image blur prevention according to claim 5, wherein the factor is vibration generated by movement or collision of the shutter, and the predicting unit directly or indirectly detects movement of the shutter. Control device. 7. The image blur prevention according to claim 5, wherein the factor is vibration generated by movement or collision of the mirror, and the predicting unit directly or indirectly detects movement of the mirror. Control device. 8. The vibration is generated by the film feeding, and the predicting unit directly or indirectly detects the film feeding operation.
Control device to prevent image blurring of the image. 9. The control device for preventing image blur according to claim 1, wherein the coping means changes a detection characteristic of the blur detecting means. 10. The control device for image blur prevention according to claim 1, wherein the coping means modifies the control in a stage subsequent to the shake detection means, and modifies the operation of the shake prevention means. 11. The control device for preventing image blur according to claim 10, wherein the coping means changes an operation characteristic of the blur prevention means. 12. The control device for image blur prevention according to claim 9, wherein the coping unit changes a detection frequency characteristic of the blur detecting unit. 13. The control device for preventing image shake according to claim 9, wherein the coping means prevents the shake detecting means from outputting an output corresponding to the shake when the shake exceeds a predetermined amplitude. . 14. The coping means changes a gain of a control system of the shake preventing means.
1. A control device for preventing image blurring. 15. At least one of a shake detecting unit for detecting image shake and a shake preventing unit for preventing image shake in response to the shake detecting unit is expected to exert an inappropriate action. Prediction means for predicting occurrence of a factor by at least one of direct and indirect occurrence of the factor before the shake detection means and the shake prevention means actually perform an inappropriate action. When,
Detecting means for detecting that the factor has actually occurred after the predicting means has predicted the occurrence of the factor, and at least one of the shake detecting means and the shake preventing means in response to the detecting means. And a coping means for coping with the improper action of the above. 16. The control device for image blur prevention according to claim 15, wherein the factor is generated by a mechanical operation of a device which is a subject of image blur prevention by the shake prevention means. 17. The image blur prevention according to claim 16, wherein the factor is vibration generated by movement or collision of the shutter, and the predicting unit directly or indirectly detects the operation of the shutter. Control device. 18. The image blur prevention according to claim 16, wherein the factor is vibration generated by movement or collision of the mirror, and the predicting unit directly or indirectly detects movement of the mirror. Control device. 19. The image blur prevention according to claim 16, wherein the factor is a vibration generated by the film feeding, and the predicting unit directly or indirectly detects the film feeding operation. Control device. 20. The control device for image blur prevention according to claim 15, wherein the coping unit changes a detection characteristic of the blur detecting unit. 21. The control device for image blur prevention according to claim 15, wherein the coping means modifies control in a stage subsequent to the shake detection means and modifies the operation of the shake prevention means. 22. The control device for image blur prevention according to claim 21, wherein the coping means changes an operation characteristic of the shake prevention means. 23. The coping means changes a detection frequency characteristic of the shake detecting means.
Control device to prevent image blurring of the image. 24. The control device for preventing image shake according to claim 20, wherein the coping means prevents the shake detecting means from outputting an output corresponding to the shake with respect to a shake having a predetermined amplitude or more. . 25. The coping means changes a gain of a control system of the shake preventing means.
2. A control device for preventing image blurring. 26. It is expected that at least one of a shake detecting unit for detecting an image shake and a shake preventing unit for preventing an image shake in response to the shake detecting unit has an inappropriate action. Prediction means for predicting occurrence of a factor by at least one of direct and indirect occurrence of the factor before the shake detection means and the shake prevention means actually perform an inappropriate action. When,
A control device for preventing image blur, comprising: coping means for operating at least one of the shake detection means and the shake prevention means in a state different from a normal state in response to the prediction means. . 27. The control device for image blur prevention according to claim 26, wherein the factor is generated by a mechanical operation of a device which is a subject of image blur prevention by the blur prevention unit. 28. The image blur prevention according to claim 27, wherein the factor is vibration generated by movement or collision of the shutter, and the predicting unit directly or indirectly detects movement of the shutter. Control device. 29. The image blur prevention according to claim 27, wherein the factor is vibration generated by movement or collision of the mirror, and the predicting unit directly or indirectly detects movement of the mirror. Control device. 30. The factor is a vibration generated by film feeding, and the predicting unit directly or indirectly detects the film feeding operation.
7 is a control device for preventing image blur. 31. The control device for image blur prevention according to claim 26, wherein the coping means changes a detection characteristic of the blur detection means. 32. The control device for image blur prevention according to claim 26, wherein the coping means modifies control at a stage subsequent to the shake detection means and modifies the operation of the shake prevention means. 33. The control device for image blur prevention according to claim 32, wherein the coping means changes an operation characteristic of the blur prevention means. 34. The coping means changes a detection frequency characteristic of the shake detecting means.
Control device to prevent image blurring of the image. 35. The control device for preventing image shake according to claim 31, wherein the coping means prevents the shake detecting means from outputting an output corresponding to the shake with respect to a shake having a predetermined amplitude or more. . 36. The coping means changes a gain of a control system of the shake preventing means.
3 is a control device for preventing image blurring.