JPH11142904A - Image blurring correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an easy-to-use image blurring correcting device by shortening a standby time for starting an appropriate image blurring correction. SOLUTION: The device is provided with a shake detecting means 71 for detecting the shake, a signal processing circuit 51 for processing the output signal of the means 71 and outputting a signal to be used for the image blurring correction, time constant changing means 11k and 11n for changing the time constant of the signal processing circuit 51 from the small one to the large one in accordance with the start-up operation of the means 71, or the resetting operation of the circuit 51 and a varying means 11q for varying the changed amount of time constant from the small one to the large one by the means 11k and 11n in accordance with the state of the optical device (the output states of 52d and 52f).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an image blur correction device mounted on a camera or the like to correct image blur.

[0002]

2. Description of the Related Art In a current camera, all operations important for photographing, such as exposure determination and focusing, are automated, so that even a person unskilled in camera operation is very unlikely to fail in photographing.

[0003] Recently, a system for preventing camera shake added to a camera has been studied, and a factor which causes a photographer to make a photographing error has almost disappeared.

Here, a system for preventing camera shake will be briefly described.

The camera shake at the time of photographing is usually a vibration of 1 Hz to 10 Hz as a frequency. At the time of the release of the shutter, the camera shake is basically required to enable taking a picture without image blur even if such a camera shake occurs. As an idea, it is necessary to detect the camera shake caused by the camera shake and to displace the correction lens according to the detected value.
Therefore, in order to take a photograph in which image shake does not occur even when camera shake occurs, first, it is necessary to accurately detect the camera vibration and, secondly, to correct the optical axis change due to camera shake. Become.

In principle, this vibration (camera shake) is detected by a shake detection sensor that detects acceleration, angular acceleration, angular velocity, angular displacement, and the like, and an output of the shake detection sensor is appropriately processed for camera shake correction. This can be achieved by mounting a vibration detecting means having an arithmetic unit on the camera. Then, based on this detection information, the correction optical means for decentering the photographing optical axis is driven to perform image blur suppression.

The details of an anti-vibration system having a vibration detecting means and a correction optical means are disclosed in Japanese Patent Application Laid-Open No. 2-58037. The outline will be described with reference to FIG.

FIG. 24A is a perspective view of a compact camera equipped with an anti-vibration system, 61 is a cover of the camera, 62 is a taking lens of the camera, and is protected by a lens barrier when not taking a picture. (In FIG. 24A, the lens barrier is retracted and cannot be seen because of the shooting state.) 6
Reference numeral 3 denotes a main switch of the camera. FIG. 24A shows a photographable state in which the image stabilizing system is turned on. When the main switch 63 is set to the index "OFF", photographing is disabled. Sports mode 64
When the camera is set to the (high-speed shutter mode) or the strobe mode 65, the mode is switched to a photographable state in which the image stabilization system is turned off (since the image stabilization system is not required in such a mode). Reference numeral 66 denotes a release button. When the release button 66 is pressed, the camera performs photometry and distance measurement.
After focusing, image blur correction is started and the film is exposed. 67 automatically emits light when the subject is dark, etc.
Alternatively, it is a strobe light emitting unit that forcibly emits light.

FIG. 24B is an internal perspective view of FIG. 24A, in which reference numeral 68 denotes a camera body, and reference numeral 69 denotes a correction optical system 70 which is freely driven in the X and Y directions in the figure to perform image blur correction. The correction optical means 71p and 71y are each provided with a shake 72 in the pitch direction.
It is a vibration detecting means for detecting a shake 72y in the p and yaw directions. Reference numeral 73 denotes the above-described lens barrier, which is shown in FIG.
It opens and closes in conjunction with the knob 74 shown in FIG. The knob 74 is shown in FIG.
As shown in FIG. 4A, the main switch 63 is adjacent to the main switch 63. When the main switch 63 is operated, the knob 74 is also pushed and the lens barrier 73 is opened. When the lens barrier 73 is in the closed state, the correction optical unit 69 (specifically, a support frame supporting the correction optical system 70) is mechanically locked, and the correction optical unit 69 is unraveled when the mobile phone is not used for photographing. Prevents damage.

FIG. 25 is a block diagram showing a signal processing system from the vibration detecting means to the correcting optical means, and has the same configuration in two shake detecting directions (72p, 72y) and two image blur correcting directions X and Y. For this reason, only an image blur correction signal processing system in one direction is shown here.

The vibration detecting means 71 includes a camera operating means 53
, The detection of vibration is started by inputting the signal 53c (ON signal of the camera main switch) from. And
The signal 71a detected here is input to the signal processing unit 51, and after performing a calculation process described later, outputs the calculation result to the correction optical unit 69 as an image blur correction target value to perform image blur correction.

FIG. 26 is a block diagram showing the internal configuration of the signal processing means 51. A signal 71a from a vibration detecting means 71 is input to a high-pass filter 51b, where a DC offset component superimposed on the signal 71a is cut. Is done. Note that the camera operating means 5 is also provided in the high-pass filter 51b.
Signal 53c from 3 (ON signal of camera main switch)
Is input, and the high-pass filter 51b changes its time constant from small to large according to the input of the signal 53c.

Hereinafter, this will be described with reference to FIG.

FIG. 27A is a Bode diagram of a high-pass filter having a large time constant. The horizontal axis represents the frequency of the input signal, and the vertical axis represents the attenuation of the input signal 71a by the high-pass filter.

FIG. 27 (a) shows that low frequencies below the frequency f ₀ are attenuated, and the signal 71a from the vibration detecting means 71 is passed through the high-pass filter 51b to obtain a signal D.
The band components from C to f ₀ are cut. Therefore, the low-frequency band that is an error component is cut, but the band of camera shake (1 to 10 Hz) is not attenuated. Incidentally, are you sufficiently low frequency than the band shake the f _0, the signal phase characteristic accuracy in the vicinity of f ₀ is low, this thing is to avoid degrading the signal of the hand shake band.

However, in a high-pass filter having such characteristics, a long time is required until the DC component is cut. Because if you try to cut the DC component without affecting the camera shake frequency band 1 to 10 Hz, f ₀ becomes
It is necessary to set the frequency around 0.1 Hz, and ideally, 10 seconds, which is the reciprocal (wavelength) of the frequency, is required to sufficiently cut the 0.1 Hz signal component.

Further, f ₀ is shifted to the high frequency side, and FIG.
When a characteristic with a small time constant (f ₁ = 2 Hz) is obtained,
It takes only 0.5 seconds to cut the DC, but it is attenuated even to the low frequency side of the camera shake band, deteriorating the image stabilization accuracy.

Therefore, early DC by the high-pass filter
As a cutting method, there is a method of changing a time constant. This is because, at the beginning of the high-pass filter startup, DC cut is performed early with a characteristic having a small time constant as shown in FIG. 27B, and then a characteristic with a large time constant as shown in FIG. It is a way to prevent.

The time constant may be changed from f ₁ to f ₀ as described above. However, in order to stably output the signal continuously,
f ₁ → f ₂ → f _k ... f ₀ (f ₁ > f ₂ ...> f _k > f
₀ ) and the time constant should be changed continuously by spending a predetermined time (for example, 0.5 seconds).

[0020] Figure 28 shows a specific configuration of such a high-pass filter, high pass filter 51b, the capacitor 42 of capacitance C _1, the resistance of the resistance value R ₁ to R ₄ 43
The time constant can be changed by switching the above-mentioned resistance by switches 44b to 44d.

Now, f _{0 in} FIG. 27A is f ₀ = 1 / (2πRC), where R is calculated by the equation of the combined resistance of R _{1 to} R ₄ . Therefore, the switches 44b-4
By appropriately opening and closing 4d, the time constant of the high-pass filter 51b is freely controlled, and in FIG.
Until is input, all switches are closed and the time constant is small. For example, the capacitor 42
Capacitance C ₁ of the 10uF, the resistance value R ₁ of the resistor 43a 15
0Keiomega, the resistance value R ₂ of the resistor 43b 70KΩ, resistor 43
When the resistance value R ₃ of c 30 k.OMEGA, the resistance value R ₄ of the resistors 43d and 15K, until the signal 53c is inputted "f
₁ = 1.9 Hz ".

Then, from the input of the signal 53c, the switch 4
4d, 44c, and 44b are opened in this order to increase the time constant, thereby preventing the accuracy of the shake band component from deteriorating.

Referring back to FIG. 26, the high-pass filter 5
The signal 51c from 1b is input to the integrator 51d. The integrator 51d serves to integrate the input signal, and when the output of the vibration detecting means 71 is an angular velocity, integrates the signal and converts it into an angle.

FIG. 29 (a) is a Bode diagram showing the characteristics of the integrator 51d, which has the characteristic of integrating over the frequency f ₀ (the gain decreases in proportion to the frequency as shown in the figure). The characteristic is called an integral characteristic). Also here, the frequency f ₀ is set sufficiently lower than the camera shake band, for the same reason as in the case of the high-pass filter. Therefore, a signal having a frequency lower than the camera shake band is amplified by the gain A.

FIG. 29B is a Bode diagram in which the time constant of the integrator 51d is reduced to integrate higher frequencies than the frequency f ₁ (f ₁ > f ₀ ). low-frequency side of the gain from the frequency f ₁ as compared to (also shown in dashed line) (the amplification factor of the input signal) is small. This indicates that the low frequency error displacement is small, but the characteristic shown in FIG. 29 (b) does not have the integration capability sufficient to cover the camera shake frequency band, so that high-precision image stabilization cannot be performed. For this reason, although the low-frequency error does not become small, it is necessary to use an integrator having a large time constant and having the characteristics shown in FIG.

The integrated output may not be stable depending on the state of the signal input from the vibration detecting means 71. For example, when a large signal is suddenly input to the integrator 51d, or
When an output fluctuation that is regarded as a low frequency such as a discontinuous signal occurs, the characteristic of FIG. 29B having a small time constant does not matter as described above, but the characteristic of FIG. It takes time for the effects to converge.

Therefore, the method of changing the time constant is also used here. At the beginning of use of the integrator 51d, the characteristic shown in FIG. 29 (b) having a small time constant is used.
The time constant is changed to a large characteristic.

[0028] Figure 30 is a diagram showing a specific configuration of an integrator 51d, integrator 51d, the capacitor 45 of capacitance C _2, than the resistance 46a~46d and the operational amplifier 48 of the resistance value R ₅ to R ₈ It is configured. And the switch 47
When b to 47d are all open, the resistor 46a and the capacitor 4
5 determines the time constant (greater this time most time constant), when the switch 47b~47d is closed all the resistance value R ₅
Time constant determined by the total resistance and the capacitor 45 to R ₈ (the time constant is small at this time the most).

Returning to FIG. 26, the integrator 51d receives a half-press signal 53b of the release button from the camera operating means 53.
Are input, and the switches 47b to 47d are all closed until the signal 53b is input.
Are input in the order of the switches 47d, 47c, and 47b, and the time constant of the integrator 51d is set to (for example, 0.2
(Over a second).

The signal 51e from the integrator 51d is input to the gain adjuster 51f at the next stage, where the gain is adjusted.

The amount by which the correction optical means 69 is driven for image blur correction is changed depending on the state of the photographing optical system (position of zoom and focus). This is because the eccentric sensitivity of the correction optical unit 69 changes depending on the state of the photographing optical system. Therefore,
The gain adjuster 51f appropriately amplifies the signal of the input 51e from the integrator 51 based on the zoom signal 52a from the photographing state detecting means 52, and sets the amplified signal as the image blur correction target value.

The high-pass filter 51h is as shown in FIG. 31, the resistor 4 of the capacitor 49 and the resistance value R ₉ capacity C ₃
10 and an operational amplifier 412, and the switch 411 is normally closed. Therefore, the high-pass filter 51h
Is zero, and the correction optical unit 69 does not perform image blur correction driving.

Thereafter, when the signal 53a is inputted by pressing and releasing the release button in the camera operation means 53, the switch 411 is opened.

The time constant determined by the capacitor 49 and the resistor 410 is large, for example, a high-pass filter that attenuates only components at a frequency of 0.05 Hz or less, and there is no deterioration of the camera shake frequency component. Therefore, at the same time when the switch 411 is opened, the camera shake correction target value starts to be input to the correction optical unit 69, and the correction optical unit 69 performs image blur correction driving based on the input.

The exposure of the film is started by the release of the release button. When the exposure is completed, the output of the signal 53a is stopped (until the release is pressed and released again). 411 is closed and the input to the correction optical means 69 becomes zero.

[0036]

As described above, the signal processing means 51 has a role of integrating the output from the vibration detecting means 71 and a role of cutting a DC component superimposed on the output from the vibration detecting means 71. I have.

However, as described with reference to FIG. 29A, the signal component having a frequency lower than the camera shake band is greatly amplified during the integration process, and this causes the following problem.

Immediately after the start of the vibration detecting means 71, its output has a swell of an extremely low frequency component, and the output is amplified by the signal processing means 51, thereby deteriorating the vibration isolation accuracy. Of course, this extremely low frequency undulation can be settled after waiting for a while (for example, one second), but it is not practically preferable to require such a long waiting time for each photographing.

The time constant of the signal processing means 51 can be changed by
As described above, it takes a certain amount of time (for example, 0.5 seconds) to continuously change from a small (f ₁ ) to a large (f ₀ ). Becomes

(Object of the Invention) An object of the present invention is to provide an image blur correction apparatus which can shorten the standby time for starting proper image blur correction and is easy to use.

[0041]

In order to achieve the above object, the present invention is applied to an optical apparatus, and operates image blur correction means to correct image blur. An apparatus, wherein a shake detecting means for detecting a shake,
A signal processing circuit that processes an output signal of the shake detecting unit and outputs a signal used for image blur correction; and a signal processing circuit that starts the shake detecting unit or resets the signal processing circuit. Time constant changing means for changing the time constant of the processing circuit from small to large, and variable means for changing the amount of change of the time constant from small to large by the time constant changing means in accordance with the state of the optical device. And an image blur correction device having the same.

More specifically, the signal processing circuit is a high-pass filter that cuts off the DC component of the output signal of the vibration detecting means, or an integrator that integrates a signal corresponding to the output signal of the vibration detecting means. The control means changes the upper limit of the time constant of the high-pass filter or the integrator depending on the state of the optical device (in the case of a camera, at least one of the focal length and the exposure time).

According to another aspect of the present invention, there is provided an image blur correcting apparatus for operating an image blur correcting means to correct an image blur. Means, a signal processing circuit for processing an output signal of the shake detecting means and outputting a signal used for image blur correction, and starting use of the signal processing circuit after a predetermined time has elapsed after the start of output of the shake detecting means And a control means for changing the time constant of the signal processing circuit from small to large at the start of use of the signal processing circuit.

More specifically, the control means inputs the output to the signal processing circuit a predetermined time after the vibration detection means starts outputting, or controls the signal processing circuit after a predetermined time after the vibration detection means starts the output. Is configured to change the time constant.

According to another aspect of the present invention, there is provided a vibration detecting means for starting output in response to an operation of a first operation member, and a control unit which outputs a predetermined signal from the operation of the first operation member. First signal processing means for changing the time constant with a time delay, and second signal processing means for changing the time constant in response to an operation of a second operation member operated after the first operation member And an image blur correction device having the following.

According to another aspect of the present invention, there is provided a vibration detecting means for starting output in response to an operation of a main switch of a camera, and a vibration detecting means for starting a predetermined time after the operation of the main switch. A high-pass filter that changes a constant and interrupts a DC component of an output signal of the vibration detection unit, and changes a time constant in response to an operation of an operation member for starting a photographing preparation operation, and outputs the output of the high-pass filter. And an integrator that outputs a signal corresponding to the shake by integrating the image blur.

According to another aspect of the present invention, there is provided a vibration detecting means for detecting a shake and a first means for changing a time constant in response to an operation of a first operation member. Signal processing means, and second signal processing means for changing a time constant in response to an operation of a second operation member operated after the first operation member, wherein the second operation When the operation of the member is performed within a predetermined time after the operation of the first operation member, the time constant of the second signal processing unit is changed in response to the operation of the second operation member. Is not performed.

According to another aspect of the present invention, there is provided a vibration detecting means for detecting a shake, and changing a time constant in response to an operation of an operation member for starting photographing preparation. In addition, a high-pass filter that cuts off a DC component of an output signal of the vibration detection unit, and changes a time constant in response to an operation of the operation member for starting the photographing operation, and integrates an output of the high-pass filter. An integrator that outputs a signal corresponding to a shake, when the operation for starting the photographing operation is performed within a predetermined time after the operation of the operation member for starting the photographing preparation operation, the integrator is provided. Is not changed in response to the operation of the operation member for starting the photographing operation.

According to another aspect of the present invention, there is provided a vibration detecting means for detecting a shake,
A high-pass filter that is connected in series for signal processing of the output of the vibration detecting means and blocks a DC component of an output signal of the vibration detecting means, and is connected in series to the high-pass filter to integrate the output of the high-pass filter into a shake An integrator that outputs a corresponding signal; and a connection unit that connects an output of the integrator to a correction unit and causes the correction unit to perform image blur correction. The vibration detection unit includes a main switch of a camera. Starting output in response to the operation, the high-pass filter comprising:
Thereafter, after a predetermined time has elapsed, the time constant is changed, the integrator changes the time constant in response to the operation for starting the imaging preparation operation, and the connection unit operates the operation member for starting the imaging operation. An image blur correction device for connecting an output of the integrator to the correction means in response.

[0050]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

Before starting the description of the first embodiment, the basic concept of the first embodiment will be briefly described.

[0052] As described with reference to the diagram of FIG 25 after the foregoing, the characteristic high-pass filter in the signal processing means 51 for attenuating the f ₀ below, the integrator has a characteristic of integrating more than f _0, these By performing vibration isolation based on the output that has passed through,
Although mean that obtaining the free image of shake during shooting, but Yuku fading As you move the f ₀ to the high frequency side vibration damping effect, not made ineffective vibration reduction.

For example, if f _{0 is set} to f ₀ ′ (f ₀ ′> f ₀ ), a photograph without a sufficient image blurring at a focal length of 200 mm and a shutter speed of 1/15 sec has been obtained. Unless is set to 1/60 sec, a photograph without image blur cannot be taken. However, in order to take a picture without shake when the image stabilization is not used, a shutter speed of one-fourth of the focal length generally referred to (in this case, 1/2)
00 sec), the image can be taken with a slow shutter.

Conversely, the shutter speed is 1/15 sec.
At the time of f ₀ , a picture without image blurring was taken at a focal length of 200 mm at f ₀ , but at f ₀ ′, a picture without image blurring can be taken at a focal length of 80 mm, which is acceptable when there is no image stabilization Photographing is possible on the telephoto side of the focal length (in this case, 15 mm).

The advantage of changing f ₀ to f ₀ ′ is that
The time to change to f ₁ → f ₀ at the start of shooting f ₁ → f ₀ '
(F ₀ <f ₀ ′ <f ₁ ), so that the waiting time for changing the time constant can be shortened.

Considering the actual photographing situation, 1/8 sec.
1/30 sec, 1/60 sec.
There are many shooting conditions with a shutter speed of c and a focal length of about 50 mm. In such a case, even if the effect of the vibration isolation is slightly reduced (f
₀ → f ₀ ′), and paying attention to the fact that giving priority to shortening the waiting time is practically superior, and changing the change amount of the time constant according to the photographing conditions (for example, changing f ₁ → f ₀ f ₁ → f ₀ ′) is one of the points of each embodiment described below, and of course, １ ／ sec and ８ sec
In such special imaging condition in the case of tele 200mm etc. at a slow shutter speed, to enhance the vibration damping effect sufficiently in the integrator characteristics for integrating the high-pass filter and f ₀ than to attenuate f ₀ following To deal with.

In such a case, as described above, a certain waiting time (for example, one second) is required at the time of photographing. However, in the case of performing slow shutter photographing, the photographer holds the camera firmly and aims at the subject slowly and carefully. This waiting time is not a problem.

Hereinafter, a first embodiment of the present invention will be described.

FIG. 1 is a block diagram showing a schematic configuration of a main part of a camera according to the first embodiment of the present invention and other respective embodiments.

The camera microcomputer 11 receives a signal 53 from the camera operation means 53 when the camera main switch is turned on.
c, a signal 53b accompanying the half-press of the release button (hereinafter, referred to as a signal 53b)
S1) and a signal 53a (hereinafter also referred to as S2) associated with the release of the release button.
Further, from the photographing state detecting means 52, a zoom signal 52a as focal length information at the time of photographing, a focus signal 52b corresponding to a lens extension amount at the time of photographing, and shutter speed information 52c are input.

On the other hand, based on these signals, the camera microcomputer 11 outputs a signal 11 for activating the vibration detecting means 71.
a, a signal 1 for changing a time constant of a high-pass filter or an integrator, which will be described later, in the signal processing means 51 and an amplification factor of a gain adjuster
1b to 11e are output.

The camera microcomputer 11 sends the output (signal 71 a) of the vibration detecting means 71 from the signal processing means 51 to the camera microcomputer 11.
Is input.

FIG. 2 is a block diagram of the above configuration for each component, that is, the camera microcomputer 11, the signal processing unit 51, the photographing state detection unit 52, and the camera operation unit 53 shown in FIG. , Each of which is surrounded by a broken line to show its internal configuration.

In FIG. 2, the signal processing means 51
6, a high-pass filter (HPF) 51b,
Integrator 51d, gain adjuster 51f, high-pass filter 5
1h. And this signal processing means 5
1 has a function of outputting a signal 71a input from the vibration detecting means 71 to the correction optical means 69 as a signal 51a of an image blur correction target value.

When the camera operation means 53 is turned on, the signal 5
Camera main switch 53e for generating 3c, signals 53b (S1) and 53a (S2) in response to half-press and push-off.
Is provided with a release button 53d for generating
Each of the signals 53c, 53b, 53a is input to the camera microcomputer 11.

The release button 53d is a two-stage tact switch as described above. Due to its nature, when the release button 53d is half-pressed (pressed to the start position of the shooting preparation operation), only the signal S1 is generated. However, at the time of push-off (push-in to the shooting operation start position), the signal S1
And the signal S2 are generated together, and only the signal S2 is not generated.

The photographing state detecting means 52 is a focus information output circuit 5 for outputting a lens barrel extension amount based on the distance measurement result.
2e, zoom information output circuit 5 for outputting focal length state
2d, a shutter speed information output circuit 52f for outputting an exposure time, and a signal 52 outputted from each of them.
b, 52a, and 52c are input to the camera microcomputer 11.

As described above, the components of the camera microcomputer 11 are also divided into blocks according to their functions.
These blocks do not exist individually as circuits.

Next, the operation of the main part of the camera will be described with reference to the block diagram of FIG. When the camera main switch 53e is turned on, all the circuit blocks in FIG. 2 enter an operation standby state. That is, when an external signal is input, power is supplied to the circuit so that the signal can be output immediately.

When the signal 53c is generated in synchronization with the turning on of the camera main switch 53e, the signal 11a is output from the signal generating circuit 11f in response to the input of the signal 53c, and the vibration detecting means 71 starts detecting the vibration. The camera shake signal 71 a detected by the vibration detection means 71 is input to the high-pass filter 51 b in the signal processing means 15.

The signal generator 11f outputs a signal 11g to the delay circuit 11h in response to the input of the signal 53c.
The delay circuit 11h receives, for example, 5
The signal 11y is output to the AND circuit 11i with a delay of 0 msec.

When the release button 53d is half-pressed, the signal S1 is input to the AND circuit 11i, and the AND circuit 11i outputs the signal 11j only when both the signal 11y and the signal S1 are input. I do. That is, even if the photographer performs an operation to turn on the main switch 53e while holding down the release button 53d, the signal 11j is output with a delay from the turning on of the main switch 53e.

Accordingly, the time constant of the high-pass filter 51b is always changed with a delay from the driving of the vibration detecting means 71,
The unstable output of the vibration detection means 71 at the initial stage of driving does not affect the high-pass filter 51b.

The signal 11j from the AND circuit 11i is input to a time constant changing circuit 11k,
1k is synchronized with the input of the signal 11j, and the signal 11b
_1, 11b _2, 11b ₃ spent for example 0.2 seconds and sequentially outputs, by this signal, the switch 4 shown in FIG. 28
4d, 44c, and 44b are sequentially released, and the time constant of the high-pass filter is changed in the same manner as in the description of the conventional example. In the present embodiment, this time constant is changed depending on the state of the camera. Is not changed until the end (for example, the switches 44c and 44b are not opened).

The exposure time information 52c from the shutter speed information output circuit 52f and the focal length information 52a from the zoom information output circuit 52d are both time constant change amount calculation circuits 1
1q, and the time constant change amount calculation circuit 11q
Then, the product of these signals 52a and 52c is calculated. For example, shutter speed 1/50 sec, focal length 200mm
When the shutter speed is 1/200 sec, the product is "1" even at the same focal length, and the product is "0.5" when the focal length is 25 mm even at the shutter speed of 1/50 sec. It can be easily understood that the smaller this product is, the less the deterioration of the photograph due to camera shake is. Then, the time constant change amount calculation circuit 11q determines how much the time constant is changed based on the product, and
Time constant changing circuit 11k and time constant changing circuit 11
n.

The time constant changing circuit 11k changes the time constant changing amount based on the signal 11r. For example, the product is "1".
, The signals 11b ₁ , b ₂ , and b ₃ are not output (the switches 44d, 44c, and 44b remain closed), and when the product is “2”, only the signal 11b ₁ is output (the switch 44d
Only when the product is “10”, the signal 11b ₁ , 1
1b ₂ are sequentially output (the switches 44d and 44c are sequentially opened), and when the product is “20”, the signals 11b ₁ and 11b ₂ are output.
11b ₃ in order (switches 44d, 44c, 4
4b in order). Therefore, the time required for changing the time constant, 0.2 seconds is required for switching the three switches as described above. When the above-mentioned product is small, this time is shortened.

The signal 11j from the AND circuit 11i is also input to the delay circuit 11l, and the delay circuit 11l outputs the signal 11m to the time constant changing circuit 11n with a delay of, for example, 0.1 second from the input of the signal 11j. . As a result, the integrator 51d changes its time constant after the output of the high-pass filter 51b is stabilized to some extent.
No error signal is input to the

The time constant changing circuit 11n sequentially changes the time constant of the integrator 51d from a small time to a large time (for example, by spending 0.2 seconds) from the time when the signal 11m is inputted.
₁ , 11c ₂ and 11c ₃ are output, and the switch 4 shown in FIG.
7d, 47c, and 47b are released. The signal 11r from the time constant change amount calculation circuit 11q is also input to the time constant change circuit 11n.
As in the case of k, the amount of change in the time constant is limited depending on the shooting conditions.

The window comparator 11o includes an integrator 51
When the signal 51e from d is out of the predetermined range, the signal 11p
Is output. The time when the signal 51e is out of the predetermined range is a time when the direction of the camera is largely changed during framing change or panning. Signal 5 by this operation
Since the time until the fluctuation of 1e stops is shorter as the time constant is smaller, the high-pass filter 51b and the integrator 5
Decrease the time constant of 1d. That is, the signal 11p from the window comparator 11o is supplied to the time constant changing circuit 11k, 1
Is input to 1n, with the function of stopping the output of the signal 11b _1, 11b _2, 11b ₃ and _{11c 1, 11c 2, 11c 3} .

That is, the switches 44b and 44 shown in FIG.
c, 44d and switches 47b, 47c,
47d is closed, the high-pass filter 51b, the integrator 51
Decrease the time constant of d. As a result, the signal 51e becomes smaller, and the signal 11e from the window comparator 11o becomes smaller.
The output of p is stopped. At this time, the time constant changing circuit 11
Since signals 11j and 11m have already been input to k and 11n, signals 11b ₁ , 11b ₂ , 11b ₃ and 11c
₁ , 11c ₂ , and 11c ₃ start outputting again sequentially based on the signal 11r, and the high-pass filter 51b and the integrator 51d
Is changed from small to large.

The signals 52a and 52b from the zoom information output circuit 52d and the focus information output circuit 52e are input to the amplification factor adjusting circuit 11x. Then, the amplification factor adjusting circuit 11x outputs the signal 11d to the gain adjuster 51f according to the state of the signals 52a and 52b. The change in the photographing magnification due to the focus or zoom state is used to correct the correction optical means 69.
The anti-vibration sensitivity changes. Specifically, the correction optical unit 6
The amount of image blur correction on the film surface for the moving force of No. 9 changes. To compensate for this, the amplification factor adjustment circuit 11x outputs the signal 11d to the gain adjuster 51f, and changes the gain according to the focus and zoom state.

The signal 11m from the delay circuit 11l is input to the delay circuit 11s, and is delayed by, for example, 0.1 second.
It is output to the AND circuit 11u as t. The signal S2 associated with the press and release of the release button 53d is also input to the AND circuit 11u. When both the signal S2 and the signal 11t are input, the signal 1U is output from the AND circuit 11u.
1v is output. The signal 11v is input to the time constant switching circuit 11w, and in response to the signal 11v, the time constant switching circuit 11w outputs the signal 11e to switch the time constant of the high-pass filter 51h.

Specifically, the switch 411 in FIG. 31 is opened. Thus, the signal 51a of the image blur correction target value is output from the high-pass filter 51h to the correction optical unit 69, and the image blur correction is started.

With the delay circuit 11s, even when the release button 53d is half-pressed and depressed at the same time, the time constants of the high-pass filter 51b and the integrator 51d are changed before the high-pass filter 51h.
An unstable target value signal does not enter the correction optical unit 69.

Exposure to the film is started by pressing the release button 53d, and during this period image blur correction is performed, but when the exposure is completed, the output of the signal 11e from the time constant switching circuit 11w is stopped. FIG. 31
Is closed, the signal 51a becomes zero, and the image blur correction ends. The signal 11e is output again when the release of the shutter release button 53d is released and the shutter release button 53d is operated again.

As described above, the image blur correction is automatically stopped in response to the completion of the exposure.

After a predetermined time (for example, 4 seconds) after the release button 53d is half-pressed, the high-pass filter 51 is released.
b, The time constant of the integrator 51d is returned from large to small. Here, the reason why the time constant is not restored for a while after the half-press is released is that the operability in the case of continuing shooting is considered,
When you press the release button continuously for the second time like this,
The high-pass filter 51b and the integrator 51d output a signal immediately and are stable, so that photographing can be performed immediately.

The main parts of the camera in the circuit configuration described above are shown in the flowcharts of FIGS.

This flow is for explaining only the image stabilizing system related to the present embodiment, and describes other elements (photometry, distance measurement, focusing drive, zoom operation, strobe, etc.) in the camera. Omitted that explanation.

This flow is based on the camera main switch 5.
The flow is started when 3e is turned on, and this flow is forcibly ended when the camera main switch 53e is turned off halfway. (Of course, all the elements are reset to the initial values.) When the camera main switch 53e is turned on, the operation from step # 1001 in FIG. 3 is started, and here, the driving of the vibration detecting means 71 is started. And the next step #
In step 1002, the timer t ₁ is started, and in the following step # 1003, the process waits until the relationship of “t ₁ ≧ ta” (ta is, for example, 50 msec or more) is satisfied.
This means that it waits until the output of the vibration detecting means 71 is stabilized (the role of the delay circuit 11h in FIG. 2).

In the next step # 1004, the process stands by until the release button 53d is half-pressed and the signal S1 is generated (hereinafter, signal S1 is turned on). When it is detected that the signal S1 is turned on, the process proceeds to step # 1005. Go ahead, photometry,
A distance measurement operation is performed, and a shutter speed (T
v) and the lens extension amount (focus (f) information) are obtained. Then, in the next step # 1006, the zoom (Z) information is input, and in the next step # 1007, the image stabilization gain is set from the obtained focus and zoom information (the amplification factor adjusting circuit 11x in FIG. 2). Do),
In a succeeding step # 1008, the gain of the gain adjuster 51f is changed. This is because, as described above, the amount of drive of the correction optical unit 69 differs in order to appropriately perform image stabilization depending on the optical state, and this is compensated for.

In step # 1009, the time constant change amount is obtained from the zoom and shutter speed information (performed by the time constant change amount calculation circuit 11q in FIG. 2). More specifically, in this step, as described above, the product of the shutter speed and the zoom information is obtained. When the product is less than "1", "k = 0", larger than "1", and when the product is less than "2". Is "k
= 1 ”and“ 2 ”, and when“ 10 ”or less,“ k =
Classification is made as "k = 3" when the number is 2 or more than "10".

Then, in the next step # 1010, it is determined whether or not "k = 0", and if so, the flow proceeds to step # 1031 in FIG. This is because there is no need for image stabilization under the shooting conditions when “k = 0”, and the high-pass filter 51
b, It is not necessary to change the time constant of the integrator 51d. Therefore, in this case, there is no waiting time for stabilization. On the other hand, if “k ≠ 0”, the process proceeds from step # 1010 to step # 1011 to select the high-pass filter 51b.
Switch 44d (see FIG. 28) is opened. As a result, the time constant of the high-pass filter 51b increases from one step smaller to larger.

In the next step # 1012, "k
= 1 ”, and if so, step # 102
Go to 0. This means that the image stabilization to some extent is sufficient under the shooting conditions at “k = 1”, so that changing the time constant of the high-pass filter 51b is stopped any longer, and the waiting time until shooting is reduced accordingly. Can be shorter. On the other hand, “k ≠
1 In the case of "the process proceeds to step # 1013, the timer is started t _2, in the next step # 1014," t
₂ ≥ tb "(tb is, for example, 70 msec). This is a waiting time until the output is stabilized after the time constant of the high-pass filter 51b is changed.

In the next step # 1015, the switch 44c (see FIG. 28) of the high-pass filter 51b is opened. Thereby, the time constant of the high-pass filter 51b is further increased. Then, the next step # 10
At 16, it is determined whether or not “k = 2”, and if so, the process proceeds to step # 1020. The reason is the same as in step # 1012. On the other hand, “k ≠ 2”
In step # 1017, the process proceeds to step # 1017 to start the timer t ₃ , and in the next step # 1018, “t ₃ ≧
tb ”is satisfied. The reason is the same as in steps # 1013 and # 1014.

In step # 1019, the switch 44b (see FIG. 28) of the high-pass filter 51b is opened to further increase the time constant of the high-pass filter 51b by one step. Then, in the next step # 1020, the timer t ₄ is started, and in the following step # 1021, the process waits until the relationship of “t ₄ ≧ tb” is satisfied. The reason is the same as in steps # 1013 and # 1014.

In step # 1022, the integrator 5
The switch 47d of 1d (see FIG. 30) is opened. As a result, the time constant of the integrator 51d increases from one step smaller to larger.
Then, the process proceeds to step # 1023 shown in FIG.
1 "is determined. As a result, if “k = 1”, the flow proceeds to step # 1031. The reason for this is the above step #
This is the same as 1012. On the other hand, if “k ≠ 1”, the process proceeds to step # 1024, the timer t ₅ is started, and in the next step # 1025, “t ₅ ≧ tb”
Wait until the relationship is satisfied. The reason is step # 1
013, the same as step # 1014.

In step # 1026, the integrator 5
The switch 47c of 1d (see FIG. 30) is opened, and the time constant of the integrator 51d is increased by another stage. Then, in the next step # 1027, it is determined whether or not “k = 2”, and if so, the flow proceeds to step # 1031. The reason is the same as in step # 1012. on the other hand,
If “k ≠ 2”, the process proceeds to step # 1028, the timer t ₆ is started, and in the next step # 1029, the process stands by until the relationship “t ₆ ≧ tb” is satisfied. The reason is the same as in steps # 1013 and # 1014.

In step # 1030, the integrator 5
The switch 47b of 1d (see FIG. 30) is opened, and the time constant of the integrator 51d is further increased by one stage. Then, the process proceeds to step # 1031, and if the state of the release button 53d is detected and the photographer keeps pressing halfway, that is, if the signal S1 is kept on, the process proceeds to step # 1032, while the user presses halfway. If the signal S1 is stopped (hereinafter, the signal S1 is referred to as off), the process proceeds to step # 1045. Step # 1045 and subsequent steps are steps for terminating the computation by the computation means 51. It is determined that the photographing has been terminated since the photographer stopped pressing the release button 53d halfway, and the process proceeds to step # 1045. I have. Of course, when the release button 53d is half-pressed again, step # 10 is performed.
Return to 32.

In step # 1032, the integrator 5
It is determined whether the signal 51e from 1d is within a certain range or not, and the window comparator 11o in FIG. 2 performs this function. As a result, when this signal 51e is out of a certain range,
That is, as described above, when a large vibration is applied due to framing change or panning of the camera, step # 1 in FIG.
033, the high-pass filter 51b and the integrator 51d
Is reset (switches 44d, 44c, 44b
And all the switches 47d, 47c, 47b are closed)
Then, the saturation in the circuit (due to the application of large vibration) is removed, and the process returns to step # 1010 to increase the time constants of the high-pass filter 51b and the integrator 51d again.

If it is determined that the signal 51e is stable within a certain range, the process proceeds from step # 1032 to step # 1034, where it is determined whether or not the signal S2 is turned on by pressing and releasing the release button 53d. It is determined, and if it is not turned on, steps # 1031 → # 1032 → #
The operation of 1034 is repeated.

Thereafter, when the release button 53d is pressed and turned off to turn on the signal S2, step # 1034 is executed.
From step # 1035 to the high-pass filter 51
The switch 411 (see FIG. 31) for h is opened, and the target value signal 51 a is output to the correction optical means 69.

In step # 1036, the correcting optical means 69 is driven based on the target value signal 51a to start image blur correction. In the next step # 1037, the shutter is opened and exposure is started, and in the next step # 1038
, The timer t ₇ is started, and the following step #
At 1039, the process waits until the relationship of “t ₇ ≧ tc” (tc is the exposure time, which is obtained from the photometry result) is satisfied, and the flow advances to step # 1040 by satisfying this relationship, and the shutter is closed to move to the film. Is completed.

In the next step # 1041, the driving of the correction optical means 69 is stopped to stop image blur correction, and in the next step # 1042, the high-pass filter 51h
The switch 411 (see FIG. 31) is closed, and in the subsequent step # 1043, the process stands by until the release of the release button 53d is released (the signal S2 is turned off). Therefore, after the end of shooting, as long as the release button 53d is kept pressed down,
This flow does not proceed.

For example, in the continuous mode (release button 5
In the case of a camera having a mode in which a plurality of frames can be continuously photographed while the 3d push-off operation is continued), if it is determined in step # 1043 in FIG. It may be configured to return to.

When the release of the release button 53d is released and the signal S2 is turned off, the process proceeds from step # 1043 to step # 1044, where the release button 53
It waits until d is half-pressed and the signal S1 is turned off. That is, this flow does not proceed until the release button 53d is half-pressed, and the calculation by the calculation means 51 is continued, so that the next shooting can be performed without waiting time.

When the half-press of the release button 53d is released and the signal S1 is turned off, the process proceeds to step # 1045, and
A timer is started t _8. Next, step # in FIG.
The process proceeds to 1046, where it is determined whether or not the release button 53d is half-pressed again to turn on the signal S1.
If it is not turned on, the process proceeds to step # 1047, where "t
Until ₈ ≧ td ”(td is, for example, 4 seconds), the process returns to step # 1046, and waits until the release button 53d is half-pressed.

This is because the photographer frequently continues to photograph, and in such a case, the high-pass filter 51 is used every time.
b, instead of changing the time constant of the integrator 51d,
This is because the output of the integrator 51d is once stabilized for a certain period of time (td) so that the photographing can be performed without waiting time during the photographing.

Thereafter, if there is no half-press operation of the release button 53d even after the elapse of the standby time, step # 1 is executed.
048, and here, for the first time, the high-pass filter 51b,
Reset the time constant of the integrator 51d (switches 44d, 4d
4c, 44b and switches 47d, 47c, 47b are closed), and the process returns to step # 1004 in FIG.

If it is determined in step # 1046 that the release button 53d has been half-pressed, the photographing conditions are set again in steps # 1049 to # 1053. The operations in steps # 1049 to # 1053 are the same as those in steps # 1005 to # 1009 in FIG. 3, and thus description thereof is omitted here.

In step # 1054, the class s of the amount of change in the time constant newly obtained in step # 1053 is compared with the previous class K (in step # 1009). If there is a relationship, it means that the current shooting condition does not require the image stabilization accuracy as compared with the previous time, and it is not necessary to further increase the calculation accuracy of the high-pass filter 51b and the integrator 51d. Returning to step # 1032 of step 4, the signal 51e from the integrator 51d is checked, and the flow waits for the release button 53d to be pushed and cut off. Therefore, when continuously photographing under the same photographing conditions, the waiting time for changing the time constant is not required for the second and subsequent frames.

On the other hand, in the case of "s>k", it is necessary to further increase the calculation accuracy of the high-pass filter 51b and the integrator 51d. Therefore, the process proceeds to step # 1055, where the value of the class k is changed to s. Replace (update the value of k),
Returning to step # 1010 in FIG. 3, the time constants of the high-pass filter 51b and the integrator 51d are redone.

Note that a step in which the time constant has already been changed may be skipped, and the time constant may be changed in the next stage to shorten the time for changing the time constant. For example, when the switch 44d of the high-pass filter 51b and the switch 47d of the integrator 51d are already open at the time of the previous time constant change, the fact is detected and steps # 1011 to # 1015 are performed, and step # 1022 is performed. From step #
Skip to 1026.

More specifically, after step # 1010, a flow for determining the state of the switch 44d is inserted.
If d is already open, go to step # 1012,
If not, the process proceeds to step # 1011. After step # 1012, a flow for determining the state of the switch 44c is inserted. If the switch 44c is already open, the process proceeds to step # 1016; otherwise, the process proceeds to step # 101.
Proceed to 3.

Similarly, after step # 1021, a flow for determining the state of the switch 47d is inserted. If the switch 47d is already open, the process proceeds to step # 1023. If not, the process proceeds to step # 1022. # 1
After 023, a state determination flow of the switch 47c is inserted.
If the switch 47c is already open, step # 1
027, otherwise proceed to step # 1024.

In the above flowchart, the role of the delay circuits 11l and 11s in FIG. 2 is not described. However, as can be seen from the flow charts of FIGS. 3 to 5, the time constant of the integrator 51d is changed after the time constant of the high-pass filter 51b has been changed, and the release button 53d is pressed and released after the time constant has been changed. Because of the standby configuration, each of the delay circuits 11l and 11s is actually functioning.

In the flowcharts of FIGS. 3 to 5, the integrator 5 is changed after the time constant of the high-pass filter 51b is changed.
Although the time constant is changed by 1d, this operation (time constant change) may be performed in parallel by the high-pass filter 51d and the integrator 51d. In this case, like the delay circuit 11l,
The start of the time constant change of the integrator 51 d
b is later than the start of changing the time constant (b.
The change of the time constant of the integrator 51d is started in the middle of the change of the time constant of b)).

According to the first embodiment described above, the time constant changing amount of the calculating means 51 is changed according to the photographing state. More specifically, when the focal length is short or the shutter speed is fast, By reducing the amount of constant change, the waiting time for stabilizing image stabilization in a normal shooting state can be shortened, and an easy-to-handle camera can be provided.

Further, the use of the calculating means 51 is started after a predetermined time from the start of the output of the vibration detecting means 71. More specifically, the time constant of the high-pass filter 51b is set to be small to large by delaying the activation of the vibration detecting means 71. By doing so, it is possible to prevent the erroneous output output when the vibration detecting means 71 is activated from affecting the arithmetic means 51, and to achieve highly accurate image stabilization at an early stage.

(Second Embodiment) In the example of the first embodiment (FIGS. 2 to 5), the camera main switch 5
The configuration is such that the vibration detecting means 71 is activated when 3e is turned on. For this reason, if the camera main switch 53e is kept on while being turned on, the vibration detecting means 71 continues to output (actually, if the camera has not been operated for 4 minutes after the camera main switch 53e is turned on, The power supply to the vibration detecting means 71 is stopped. However, this is uneconomical in terms of power consumption.

Therefore, in a second embodiment of the present invention,
The configuration is such that the activation of the vibration detecting means 71 is started in response to the half-press of the release button 53d of the camera.

FIG. 6 is a block diagram corresponding to FIG. 2 of a camera according to the second embodiment of the present invention. The difference between the camera of the first embodiment and the configuration of FIG. The point that a signal S1 accompanying the half-pressing operation of the release button 53d is input to the circuit 11f instead of the signal from the camera main switch 53e.

Therefore, the vibration detecting means 71 starts to start in synchronization with the half-press of the release button 53d.
Of course, the start of changing the time constant of the high-pass filter 51b is delayed from the start of the vibration detecting means 71 by the delay circuit 11h, so that an output error at the time of starting the vibration detecting means 71 does not affect the high-pass filter 51b.

FIGS. 7 to 10 are flowcharts according to the second embodiment of the present invention, in which parts performing the same operations as in FIGS. 3 to 5 are assigned the same step numbers.

The difference between FIG. 3 and FIG.
In FIG. 7, when the camera main switch 53e is turned on, the operation starts from step # 1004, where the release button 53d is half-pressed and waits until the signal S1 is turned on. Proceeding to step # 1001, the vibration detecting means 71 is activated, and steps # 1002 and # 1 are performed until the output error at the time of activation stops.
It is waiting at 003. Therefore, the high-pass filter 51
When the time constant b is changed, the output of the vibration detecting means 71 is stable.

The other difference is that step # 104 in FIG.
When the half-press of the release button 53d is released at 6 and the half-press of the release button 53d is not performed for, for example, 4 seconds thereafter (YES in step # 1047),
Proceeding to step # 1048, the high-pass filter 51b
The time constant of the integrator 51d is reset, and the next step # 1
At 056, the driving of the vibration detecting means 71 is stopped, and FIG.
That is, the process returns to step # 1004 to wait for half-pressing of the release button 53d.

By providing the configuration in which step # 1056 is provided as described above, the operation time of the vibration detecting means 71 can be shortened, and power can be saved.

(Third Embodiment) In the first and second embodiments described above, the time constant of the high-pass filter 51b is changed after the release button 53d is pressed halfway. This is because the photographing condition (Tv, Z) is obtained by half-pressing the release button 53d, and the time constant change amount is not obtained until that time. Therefore, if the time constant of the high-pass filter 51b is to be changed before the release button 53d is half-pressed, it is necessary to change the time constant to the maximum in consideration of all photographing conditions. I need.

However, the camera main switch 53
When the vibration detecting means 71 is activated by turning on e, and the time constant of the high-pass filter 51b is changed, from the time when the camera main switch 53e is turned on to the time when the release button 53d is half-pressed in a normal use state. Has a certain amount of time, during which high-pass filter 51b
The time constant has been fully completed.

Regarding the change of the time constant of the integrator 51d, the amount of change may be controlled after taking the release button 53d halfway in consideration of the photographing conditions.

FIGS. 10 to 13 are a block diagram and a flowchart of a camera according to a third embodiment of the present invention based on such a concept.

In FIG. 10, the signal 11y from the delay circuit 11h is directly input to the time constant changing circuit 11k, and the signal 11r from the time constant changing amount calculating circuit 11q is input to the time constant changing circuit 11k. It has not been. Therefore, the time constant of the high-pass filter 51b starts changing after a delay from the turning on of the camera main switch 53e, and changes the time constant to the maximum (all switches 44b, 44c, and 44d are all open).

The signal 11m from the delay circuit 11l is input to the AND circuit 11i. When the signal S1 is input from the release button 53d at the time of inputting this signal, the AND circuit 11i converts the signal 11j into a time constant changing circuit. 11n and the delay circuit 11s. Therefore, the high-pass filter 5
1b, the predetermined time has elapsed, and when the release button 53d is half-pressed, the integrator 5
1d changes the time constant based on the photographing conditions.

The other circuit configuration is the same as that shown in FIG. 2 and its description is omitted.

FIGS. 11 to 13 are flow charts showing the operation in the third embodiment of the present invention as described above. Although the order of the operations is largely changed from those in FIGS. Portions performing partial operations are assigned the same step numbers, and descriptions thereof are omitted.

The feature of this flow is that when the camera main switch 53e is turned on, the process proceeds to step # 1001, the vibration detecting means 71 is activated, and then a predetermined time is delayed (steps # 1002 and # 1003 in FIG. 11), and the high-pass filter The time constant of 51b is changed (step # 1 in FIG. 11).
011) and the time constant is unconditionally changed to the maximum (steps # 1011 to # 1019 in FIG. 11), and after the time constant change of the high-pass filter 51b is completed,
In step # 1020 of FIG. 11, the timer t ₄ is started, and then in step # 2002 of FIG. 11, the integrator 5 continues until “t ₄ ≧ ta” (ta is, for example, 0.2 seconds).
Wait for the output of the high-pass filter 51b to stabilize without changing the time constant of 1d (the delay circuit 11 in FIG. 10).
l has this function).

The change of the time constant of the integrator 51b is described in FIG.
Also, until the release button 53d is half-pressed in step # 1004 of FIG.
₄ ≧ ta ”.

The flow after the switching of the time constant of the integrator 51d is almost the same as the flow charts of FIGS.
If the output of the integrator 51b falls outside the predetermined range in step # 1032 of FIG. 12, step # 2001 of FIG.
Then, only the integrator 51d resets the time constant and returns to step # 1010, where the time constant of the integrator 51d is changed again, and a predetermined time has elapsed after the signal S1 was turned off (step # 1046 in FIG. 13). , # 1047).
In step # 2005, only the integrator 51d resets the time constant, and returns to step # 1004 in FIG.

Since the high-pass filter 51b can be set so that an output error (saturation or the like) hardly occurs due to disturbance (large output of the vibration detecting means), once the output becomes stable, the output rarely becomes unstable again. Therefore, in this flow,
If the time constant of the high-pass filter 51b is changed after the camera main switch 53e is turned on, the high-pass filter 51b is not turned off unless the camera main switch 53e is turned off.
The time constant of b is not changed, and when the release button 53d is half-pressed next time, the integrator 5 is immediately turned on.
The configuration is such that the time constant of 1b can be changed. (At this time, since the timer t ₄ is also a large value, step # 200
2 can pass through. ) Camera main switch 5
By keeping the high-pass filter 51b stable when 3e is turned off, the waiting time during photographing can be shortened.

According to the third embodiment described above, the vibration detecting means 71 is started by turning on the main switch 53e, the time constant of the high-pass filter 51b is changed later than that, and the release button 53d is pressed halfway. Integrator 51
Since the configuration is such that the time constant of d is changed, the waiting time until the image stabilization can be reduced.

After that, when the release button 53d is pressed and released, the high-pass filter 51h transmits the signal from the integrator 51d to the correction optical means 69 to start image blur correction. Shake can be performed.

(Fourth Embodiment) In the first to third embodiments described above, the high-pass filter 51b and the integrator are not used until the release button 53d is pressed and the signal S2 is turned on. The configuration is such that the change of the time constant of 51d is terminated. However, the high-pass filter 51b
If the time constant change has been completed, the integrator 51d immediately before the exposure
May be changed. The disadvantage in this case is that when the output b of the integrator 51d is not obtained until immediately before the exposure, the value is uncertain (when it is not within a certain range), and when the time constant is changed again to stabilize the output, a release time lag occurs. It is to be.

However, as an advantage, since the integrator 51b is reset until immediately before exposure, the history up to that point does not affect the image stabilization accuracy.

Therefore, in the fourth embodiment of the present invention, the time constant of the integrator 51b is changed by turning on the signal S2 by pressing and releasing the release button 53d. FIG. 14 shows a block diagram of the camera according to the fourth embodiment, and its operation is shown in the flowcharts of FIGS.

In FIG. 14, the delay circuit 11l is omitted, and a signal 11j from the AND circuit 11i is output when a predetermined time has elapsed since the camera main switch 53e was turned on and when the release button 53d is half-pressed. ) Is input to the delay circuit 11s, and the delay circuit 11s outputs the signal 11t to the AND circuit 11u after a predetermined time delay.

The signal S2 generated by pressing and releasing the release button 53d is also output to the AND circuit 11u. When a predetermined time has elapsed since the release button 53d was half-pressed and the release button 53d was pressed and released, The AND circuit 11u outputs the signal 11v to the time constant changing circuit 11n,
The time constant of the integrator 51d is changed. Further, the signal 11v is also output to the time constant switching circuit 11w, and the time constant switching circuit 11w
Switch the time constant of.

The rest of the configuration is the same as that of the block diagram of FIG.

Due to the configuration as shown in FIG. 14, the time constant of the integrator 51d is changed after the release button 53d is pushed and released.

Hereinafter, portions different from those in FIGS. 3 to 5 will be described with reference to FIGS. 15 to 18. Here, portions performing the same operations as those in FIGS. 3 to 5 are denoted by the same step numbers. Description is omitted.

When this flow starts, the first difference from the flow in FIGS. 3 to 5 is that step # 1 in FIG.
031, which detects that the release button 53d has been half-pressed. If the signal has been released, that is, if the signal S1 is off, step # 104 in FIG.
5 (this is the same as the case of shifting from step # 1031 to step # 1045 in FIG. 4).

When the signal S1 is on, FIG.
The process proceeds from step # 1031 of step # 6 to the next step # 1034, and here, the process waits by circulating steps # 1031 → # 1034 until the release button 53d is pressed.

Note that, as in FIG. 4, step # 1 in FIG.
In the case of 054, when the relation of “s ≦ k” is satisfied (when the release button 53d is pressed halfway again, and the required vibration isolation accuracy at that time is the same as the previous time, or it may be low).
Is configured to return to step # 1034 in FIG.

In step # 2006 of FIG.
Similar to step # 1010 in FIG. 3, the time constant change amount is classified and detected, and the result is used in the next step # 1010.
22, or similarly proceed to Step # 1032 in FIG. From the next step # 1022, the time constant of the integrator 51d is changed, and the subsequent flow is the same as in FIG.

Since step # 2006 of FIG. 16 has been added, steps # 1031, # 1032 and FIG.
# 1034 is omitted.

In step # 2007 of FIG. 17,
As shown in step # 1042 of FIG.
In addition to turning on the switch 411 of h, the time constant of the integrator 51d is also reset. In this way, the point that the time constant of the integrator 51d is reset every time the exposure is completed is different from the previous examples.

Thus, the integrator 5 is always used immediately before exposure.
1d is reset, and the output error caused by continuing the integration operation does not affect the following effects.

As in the above flow, the release button 53
By adopting a configuration in which the time constant of the integrator 51d is changed from the pushing-off of d, it is possible to prevent the deterioration of the image stabilization accuracy. Can be reduced, and the release time lag (the time from the release of the release button 53d to the start of exposure) can be shortened.

As can be seen from the circuit configuration and the flow of the present embodiment, the signals S1 and S2 associated with the half-press and release of the release button 53d are delayed by the delay circuits 11h and 11s, respectively.
The time constant is changed by the logical product of the signals. Therefore, even when the release button 53d is half-pressed and pressed simultaneously, the time constants of the high-pass filter 51b and the integrator 51d are not changed at the same time. Button 5
The operation is not performed in synchronization with the press-off of 3d, but is performed after a predetermined time from half-pressing of the release button 53d.

The fourth embodiment has the high-pass filter 51b for changing the time constant by half-pressing the release button 53d, and the integrator 51d for changing the time constant by pressing and releasing the release button 53d. When the second operation is performed within a predetermined period of time after the first operation, the time constant of the integrator 51d is not changed in response to the push-off operation of the release button 53d. Since the apparatus waits until it is stabilized, it is possible to secure the vibration isolation accuracy at the time of exposure.

(Fifth Embodiment) The first to fifth embodiments described above.
In the fourth embodiment, the time constant of the integrator is sequentially changed from small to large, so that exposure is performed after stabilization.
However, considering that the normal exposure time is not so long and that the transient response at the time of changing the time constant of the integrator does not greatly affect the exposure, the processing circuit and the sequence can be largely arranged. In other words, if the image stabilization accuracy at the time of long exposure time is somewhat sacrificed, the circuit scale can be reduced, and the entire system can be made compact.

The fifth embodiment of the present invention is based on such a concept, and shows a block diagram for realizing it in FIG.

In FIG. 19, the high-pass filter 51h and the window comparator 1 provided in FIG.
1o, the delay circuit 11s, and the time constant switching circuit 11w are omitted. The integrator according to this embodiment is shown as 51d 'in FIG.

The signal 11m from the delay circuit 11l, which is output after a predetermined time delay after half-pressing the release button 53d (turning on the signal S1), and the signal S2 associated with the release of the release button 53d are logical product circuit 11u. , A signal 11v is output to change the time constant of the integrator.

FIGS. 20 to 22 are flow charts showing the operation of the camera having the above-mentioned structure.
Steps 001 to # 1034 in FIG. 21 are the same as the flows from step # 1001 in FIG. 15 to step # 1034 in FIG. 16 in the fourth embodiment. However, in this embodiment, if the release button 53d is pressed and depressed in step # 1034 in FIG. 21, the process proceeds to step # 3001, where the integrator 5
The open switch of 1d 'is selected.

In the embodiments described above, the switches of the integrator are opened in order, and the switch to be opened is determined by the photographing condition. By gradually changing the time constant in this way, there is an advantage that the deterioration of the vibration isolation accuracy due to the transient response of the output of the integrator due to this can be reduced,
There is a disadvantage that the time for changing the time constant needs to be long.

As described above, when the exposure time is short, the deterioration of the image stabilization accuracy due to the transient response of the integrator does not greatly affect the image stabilization accuracy. The constant is switched once.

However, by changing this switching amount under the photographing conditions, the transient response fluctuation caused by excessively increasing the time constant is reduced as much as possible.

In step # 3001, the switch to be opened is selected according to the time constant change amount classification (the result of step # 1009 in FIG. 20). Specifically, k = 0 and no switch is open k = 1 Open switches 47a, 47d k = 2 Open switches 47a, 47d, 47c k> 2 Select switches 47a, 47d, 47c as open. The switch 47a is a switch that is not provided in the integrator 51d shown in FIG. 30, and is similar to the integrator 51d 'shown in FIG.
8 is a switch for short-circuiting the output terminal 8 and the inverting input terminal. Therefore, when the switch 47a is closed, the output of the integrator 51d 'is zero, and the correction optical means 69 is not driven at all.

Therefore, by closing the switch 47a until the exposure, the role of the high-pass filter 51h as the connection means (the output is not given to the correction optical means 69 until the exposure), which has been described in the above embodiments, is performed. Yes, of course "k
In a shooting condition where image blur does not occur without performing image stabilization such as "= 0", the image stabilization is not performed by closing the switch 47a even during exposure.

In the next step # 3002, FIG.
Only the selected switch of the integrator 51d 'shown in FIG. 3 is opened, and the signal output from the integrator 51d' is started.

Thereafter, step # 103 of FIG.
6, but the difference in the subsequent flow is shown in FIG.
The only difference is that in step # 3003, the open switch of the integrator 51d 'is turned on.

The reason that the window comparator can be omitted is as follows.
This is because the time constant of the integrator 51d 'is switched immediately before the exposure, so that the history up to the time of the exposure does not affect the image stabilization accuracy.

By switching the time constant of the integrator immediately before the exposure as described above, the whole system can be made compact.

Here, the effects of the configurations of the first to fifth embodiments described above and the configuration of the present invention will be listed together taking into account the correspondence between the configurations and the configuration of the present invention.

(1) The time constant of the signal processing means 51 is changed from small to large in response to photographing or photographing preparation of the camera,
By regulating the upper limit of the change amount when the focal length of the camera is short or the exposure time is short (reducing the time constant change amount from small to large), an easy-to-handle anti-shake system is provided. Has been realized.

(2) By providing a means for changing the time constant of the signal processing means 51 for calculating the output a predetermined time after the output of the vibration detecting means 71 for detecting the shake has started, an easy-to-handle anti-vibration system is provided. Has been realized.

(3) Vibration detecting means 71 which starts outputting by a first operation (such as turning on the camera main switch 53e or half-pressing the release button 53d), and a first means for changing the time constant after a predetermined time delay from this operation. Signal processing means (such as the high-pass filter 51b) and the second operation (the release button 5
3e to change the time constant by pressing halfway or pushing off 3e)
The signal processing means (eg, the integrator 51d) constitutes an anti-vibration system, thereby realizing an easy-to-handle anti-vibration system.

(3) Vibration detecting means 71 for detecting shake
First signal processing means (such as a high-pass filter 51b) for changing the time constant by a first operation (such as turning on the camera main switch 53e or half-pressing the release button 53d);
Second signal processing means (integrator 5) for changing the time constant by a second operation (half-pressing, pushing off, etc. of release button 53d)
1d), when the second operation is performed within a predetermined time after the first operation, the time constant of the second signal processing means is changed by a predetermined time after the first operation. By doing so, an easy-to-handle anti-vibration system is realized.

(4) The first operation (the camera main switch 53e is turned on) causes the vibration detecting means 71 to start detecting vibration, and the first signal processing means (high-pass filter 51b) changes its time constant after a predetermined time delay. Then, the second signal processing means (integrator 51d) changes the time constant by a second operation (half-press of the release button 53d), and the second signal by a third operation (push-off of the release button 53d). By connecting the output of the processing means to the correction means (switching the time constant) by the connection means (high-pass filter 51h) and driving the correction means to perform image blur correction, an easy-to-handle anti-shake system is realized.

(Correspondence between Invention and Embodiment) In each of the above embodiments, the signal processing means 51 corresponds to the signal processing circuit of the present invention, and the time constant change amount calculation circuit 11q corresponds to the variable means of the present invention. The high-pass filter 51b corresponds to the first signal processing means and the high-pass filter of the present invention, the integrator 51d corresponds to the second signal processing means and the integrator of the present invention, and the time constant changing circuits 11k and 11n correspond to the first and second embodiments. The vibration detecting means 71 corresponds to the vibration detecting means of the present invention, and the correcting optical means corresponds to the correcting means of the present invention.

The above is the correspondence between each configuration of the embodiment and each configuration of the present invention. However, the present invention is not limited to the configuration of the embodiment, and the functions and functions described in the claims are not limited.
Needless to say, any configuration may be used as long as the functions of the embodiment can be achieved.

(Modification) In each of the above embodiments,
Although an example is shown in which the high-pass filter and the integrator are configured by an analog circuit, the configuration is not limited to this, and a configuration in which digital computation is performed may be used.

Although the present invention has been described with reference to an example in which the present invention is applied to a single-lens reflex camera, cameras of various forms such as a video camera and an electronic still camera, optical devices and other devices other than a camera, and those cameras The present invention can also be applied to devices applied to optical devices and other devices, or to elements constituting these devices.

[0184]

As described above, according to the present invention,
The upper limit of the time constant of the high-pass filter that cuts off the DC component of the output signal of the vibration detection means or the integrator that integrates the signal corresponding to the output signal of the vibration detection means is determined by the state of the device (for a camera, the focal length and the (At least one of the exposure times).

Further, according to the present invention, the output is input to the signal processing circuit a predetermined time after the vibration detecting means starts outputting, or the signal processing circuit is activated after a predetermined time after the vibration detecting means starts outputting. It is configured to change the time constant.

Further, according to the present invention, for example, in the case of a camera, for example, a vibration detecting means for starting output in response to an operation of a main switch, and a high-pass for changing a time constant after a predetermined time delay from the operation of the main switch. The configuration includes a filter and an integrator that changes a time constant in response to operation of an operation member for starting a photographing preparation operation.

Further, according to the present invention, for example, in the case of a camera, when an operation for starting a photographing operation is performed within a predetermined time after operating an operation member for starting a photographing preparation operation,
The time constant of the integrator that integrates the output of the high-pass filter and outputs a signal corresponding to the shake is not changed in response to the operation of the operation member for starting the photographing operation.

According to the present invention, vibration detecting means for starting output in response to operation of a main switch of a camera,
A high-pass filter that changes the time constant after a predetermined time has elapsed after the operation of the main switch, an integrator that changes the time constant in response to the operation for starting the shooting preparation operation, and an operation member for starting the shooting operation Connecting means for connecting the output of the integrator to the correcting means in response.

Therefore, it is possible to provide an easy-to-use image blur correction apparatus with a short standby time for starting appropriate image blur correction.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a camera according to each embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of the camera according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing a part of the operation of the camera according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing a continuation of the operation in FIG. 3;

FIG. 5 is a flowchart showing a continuation of the operation in FIG. 4;

FIG. 6 is a block diagram illustrating a circuit configuration of a camera according to a second embodiment of the present invention.

FIG. 7 is a flowchart showing a part of the operation of the camera according to the second embodiment of the present invention.

FIG. 8 is a flowchart showing a continuation of the operation in FIG. 7;

FIG. 9 is a flowchart showing a continuation of the operation in FIG. 8;

FIG. 10 is a block diagram showing a circuit configuration of a camera according to a third embodiment of the present invention.

FIG. 11 is a flowchart showing a part of the operation of the camera according to the third embodiment of the present invention.

FIG. 12 is a flowchart showing a continuation of the operation in FIG. 11;

FIG. 13 is a flowchart showing a continuation of the operation in FIG. 12;

FIG. 14 is a block diagram illustrating a circuit configuration of a camera according to a fourth embodiment of the present invention.

FIG. 15 is a flowchart showing a part of the operation of the camera according to the fourth embodiment of the present invention.

FIG. 16 is a flowchart showing a continuation of the operation in FIG. 15;

FIG. 17 is a flowchart showing a continuation of the operation in FIG. 16;

FIG. 18 is a flowchart showing a continuation of the operation in FIG. 17;

FIG. 19 is a block diagram illustrating a circuit configuration of a camera according to a fifth embodiment of the present invention.

FIG. 20 is a flowchart showing a part of the operation of the camera according to the fifth embodiment of the present invention.

FIG. 21 is a flowchart showing a continuation of the operation in FIG. 20;

FIG. 22 is a flowchart showing a continuation of the operation in FIG. 20;

FIG. 23 is a circuit diagram showing details of an integrator of a camera according to a fifth embodiment of the present invention.

FIG. 24 is a perspective view showing a camera equipped with a conventional image stabilization system.

FIG. 25 is a block diagram showing a schematic configuration of a conventional image stabilization system mounted on a camera.

FIG. 26 is a block diagram showing the configuration of the calculation means of FIG.

FIG. 27 is a Bode diagram when the time constant of the high-pass filter 51b in FIG. 26 is increased and reduced.

FIG. 28 is a circuit diagram showing a configuration of a high-pass filter 51b capable of switching the characteristics of FIG. 27.

FIG. 29 is a Bode diagram when the time constant of the integrator 51d in FIG. 26 is increased and reduced.

FIG. 30 is a circuit diagram showing a configuration of an integrator enabling the characteristic switching of FIG. 29.

FIG. 31 is a circuit diagram showing a configuration of a high-pass filter 51h of FIG. 26.

[Explanation of symbols]

 Reference Signs List 11 camera microcomputer 51 calculation means 52 shooting state detection means 53 camera operation means 69 correction optical means 71 vibration detection means

Claims (16)

[Claims] 1. An image blur correction device applied to an optical device and operating an image blur correction unit to correct image blur,
A shake detection unit that detects a shake, a signal processing circuit that processes an output signal of the shake detection unit and outputs a signal used for image shake correction, and activates the shake detection unit or resets the signal processing circuit. Time constant changing means for changing the time constant of the signal processing circuit from small to large, and the amount of change of the time constant from small to large by the time constant changing means according to the state of the optical device. And a variable means for changing the image blur according to the image blur. 2. The method according to claim 1, wherein the time constant changing unit starts the shake detection operation from a state where the shake detection unit is not performing the shake detection operation, or temporarily changes the time constant of the signal processing circuit from large to small. 2. The image blur correction device according to claim 1, wherein a time constant of the signal processing circuit is changed from a small value to a large value in response to the reset operation. 3. A high-pass filter for blocking a DC component of an output signal of the vibration detecting means,
3. The image blur correction device according to claim 1, wherein the image blur correction device is an integrator that integrates a signal corresponding to an output signal of the vibration detection unit. 4. The image blur correction device according to claim 3, wherein the variable unit changes an upper limit of a time constant of the high-pass filter or the integrator depending on a state of the optical device. 5. The apparatus according to claim 1, wherein the optical device is a camera, and the changing unit changes a change amount of the time constant from small to large according to at least one of a focal length of the camera and an exposure time. Item 2. An image blur correction device according to Item 1. 6. The image blur according to claim 5, wherein the variable means reduces the amount of change in the time constant when the focal length of the camera is short or when the exposure time is short. Correction device. 7. An image blur correction device for operating an image blur correction unit to correct an image blur, comprising: a shake detection unit for detecting a shake; an output signal of the shake detection unit; A signal processing circuit for outputting a signal to be used, and the use of the signal processing circuit is started after a predetermined time has elapsed after the start of output of the shake detection means, and the time constant of the signal processing circuit at the start of use of the signal processing circuit And a control means for changing the value from small to large. 8. The image blur correction device according to claim 7, wherein the control unit inputs the output to the signal processing circuit a predetermined time after the vibration detection unit starts outputting. 9. An image according to claim 7, wherein said control means has a time constant changing means for changing a time constant of said signal processing circuit a predetermined time after the vibration detecting means starts outputting. Image stabilizer. 10. A vibration detecting means for starting output in response to an operation of a first operating member, a first signal processing means for changing a time constant after a predetermined time delay from the operation of said first operating member, An image blur correction apparatus, comprising: second signal processing means for changing a time constant in response to an operation of a second operation member operated after the first operation member. 11. A vibration detecting means for starting output in response to an operation of a main switch of a camera, a time constant changing with a predetermined time delay from the operation of the main switch, and a DC component of an output signal of the vibration detecting means. A high-pass filter that cuts off a signal, and an integrator that changes the time constant in response to the operation of the operation member for starting the photographing preparation operation and that integrates the output of the high-pass filter and outputs a signal corresponding to shake. An image blur correction device, comprising: 12. A vibration detecting means for detecting a vibration, wherein
A first signal processing means for changing the time constant in response to the operation of the operating member, and changing the time constant in response to the operation of the second operating member operated after the first operating member. A second signal processing unit, wherein when the operation of the second operation member is performed within a predetermined time after the operation of the first operation member, the operation of the second signal processing unit is performed. An image blur correction apparatus, wherein the constant is not changed in response to an operation of the second operation member. 13. An operation of the second operation member is performed by the first operation member.
When the operation of the first operation member is performed within a predetermined time after the operation of the operation member is performed, the second signal is transmitted after a predetermined time longer than the predetermined time has elapsed after the operation of the first operation member is performed. 2. The method according to claim 1, wherein the time constant of the processing means is changed.
2. The image blur correction device according to 2. 14. A vibration detecting means for detecting a vibration, a high-pass filter for changing a time constant in response to an operation of an operation member for starting photographing preparation, and cutting off a DC component of an output signal of said vibration detecting means. An integrator that changes a time constant in response to an operation of the operation member for starting the photographing operation, integrates an output of the high-pass filter, and outputs a signal corresponding to a shake, When the operation for starting is performed within a predetermined time after the operation of the operation member for starting the imaging preparation operation, the time constant change of the integrator is responded to the operation of the operation member for starting the imaging operation. An image blur correction device, which is not performed. 15. When the operation of the operation member for starting the shooting operation is performed within a predetermined time after the operation of the operation member for starting the shooting preparation operation is performed, the operation of the operation member for starting the shooting operation is performed. 15. The image blur correction device according to claim 14, wherein the time constant of the integrator is changed after a predetermined time longer than the predetermined time has elapsed after the operation of the operation member. 16. A vibration detecting means for detecting a vibration, a high-pass filter connected in series for signal processing of an output of the vibration detecting means, for blocking a DC component of an output signal of the vibration detecting means, and a series connected to the high-pass filter. An integrator that is connected and outputs a signal corresponding to a shake by integrating the output of the high-pass filter; and a connecting unit that connects an output of the integrator to a correction unit and causes the correction unit to perform a shake correction. The vibration detecting means starts outputting in response to the operation of the main switch of the camera, the high-pass filter changes the time constant after a predetermined time has elapsed, and the integrator
Change the time constant in response to the operation for starting the shooting preparation operation,
The image blur correction apparatus according to claim 1, wherein the connection unit connects an output of the integrator to the correction unit in response to an operation of an operation member for starting a photographing operation.