JP2000284337A - Deflection detecting device and blurring correction camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection detecting device and a blurring correction camera capable of performing accurate shake blur without necessitating special operation in a state where vibration is restrained to be small such as at the time of attaching a tripod. SOLUTION: This deflection detecting device and this blurring correction camera are equipped with an angular velocity sensor 10 detecting deflection, an amplification part 20 amplifying an output signal from the sensor 10, an A/D converter 30, a tripod attachment detection switch 130 and an amplification control part 140. The control part 140 changes the amplification factor of the amplification part 20 based on the detected result by the switch 130.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shake detecting device for detecting vibration due to hand shake in an optical device such as binoculars or a photographing device such as a camera, and to a shake correction camera using such a shake detecting device. It is.

[0002]

2. Description of the Related Art The operation of a conventional image stabilizer will be described below with reference to FIG. FIG. 9 is a block diagram showing a basic configuration of a conventional shake correction device including a shake detection device. The angular velocity sensor 10 is a sensor that detects a shake applied to the shake correction device, and usually uses a piezoelectric vibration type angular velocity sensor that detects a Coriolis force. The output of the angular velocity sensor 10 is converted from an analog signal to a digital signal by the A / D converter 30 and then transmitted to the reference value calculation unit 40. Digital signal processing unit 300 surrounded by a dotted line
Indicates a digitally operated part inside the MCU or the like. The reference value calculation unit 40 is a part that calculates a shake reference value from the output of the angular velocity sensor 10. The shake signal output from the angular velocity sensor 10 is transmitted to the integrator 52 after subtracting the reference value. The integration unit 52
This is a part that integrates a shake signal expressed in units of angular velocity with respect to time and converts it into a shake angle of the shake correction device.

The target drive position calculating section 54 is a section for calculating target drive position information of the shake correction lens 70 from the shake angle obtained by the integration section 52. Drive signal calculation unit 5
Reference numeral 6 denotes a shake correction lens 7 according to the target drive position information.
In order to drive 0, the difference between the target drive position information and the current position information of the blur correction lens 70 is calculated. The result calculated by the drive signal calculation unit 56 is converted by the D / A converter 31 from a digital signal to an analog signal. The voltage driver 68 supplies a drive current to the coil 63 according to the drive signal converted into an analog signal.

The driving section 60 is a section for driving the blur correction lens 70, and includes a yoke 61, a magnet 62,
It is composed of a coil 63. The coil 63 is placed in a magnetic circuit formed by the yoke 61 and the magnet 62. When a current flows through the coil 63, a force is generated in the coil 63 according to Fleming's left-hand rule. The coil 63 is attached to a lens barrel 72 containing the shake correction lens 70. Shake correcting lens 70 and lens barrel 72
Has a structure that can be moved in a direction perpendicular to the optical axis I, so that the movement of the coil 63 can drive the blur correction lens 70 in a direction perpendicular to the optical axis I.

The optical position detector 64 monitors the movement of the blur correction lens 70, and includes an infrared light emitting diode (IRED) 65, a slit plate 66 having a slit 66a, a PSD (Position Sensitive Device).
67 are provided.

[0006] The light emitted by the IRED 65 first passes through the slit 66a to narrow the width of the light beam.
It reaches SD67. The PSD 67 outputs a signal corresponding to the position of light on the light receiving surface as a current. Slit plate 66
Is attached to the lens barrel 72, the movement of the shake correction lens 70 becomes the movement of the slit 66a, and the PSD 6
7 is the movement of light on the light receiving surface. Therefore, the position of the light on the light receiving surface of the PSD 67 is equivalent to the position of the blur correction lens 70. The current output from the PSD 67 is converted to a voltage by the I / V converter 69, further converted to a digital signal by the A / D converter 32, and fed back.

The detection of whether or not a camera or an optical device incorporating such a shake correction device is attached to a tripod, and the processing when the attachment to a tripod is detected are described in Japanese Patent Application Laid-Open No. 328534 and JP-A-02-
181741, JP-A-02-301732 and the like. In these prior arts, a tripod attachment detection switch is provided at the bottom of the camera body, or the attachment of the tripod is detected from the output of a shake detection sensor. Then, when the tripod is attached, the power supply to the shake detection sensor and the shake correction unit is stopped, etc.
A common method is to stop blur correction. Further, as described in Japanese Patent Application Laid-Open No. 02-173625, a method of extending the frequency band of shake detection to a low frequency region has also been proposed.

However, even if the camera is mounted on a tripod, the camera may vibrate under strong winds or when the tripod stands on an unstable place.
Also, when it is attached to a monopod, basically,
The camera vibrates because it is handheld. If you stop image stabilization in such a situation,
The resulting photo is blurred. Therefore, in such a situation, it is better to perform shake correction. Regarding blur correction when a tripod is attached, Japanese Patent Application Laid-Open No. 04-328534 discloses a method of changing the blur correction characteristics of a blur correction device when a tripod is detected.

[0009]

However, detecting the shake of the apparatus by using the above-mentioned prior art has the following problems. In general, an angular velocity sensor that detects an angular velocity is used to detect shake. The angular velocity sensor outputs a voltage proportional to the applied angular velocity as an analog signal. Normally, the output of the angular velocity sensor alone is small, so the analog signal of the voltage output from the angular velocity sensor is amplified by an amplifier circuit or the like. Then, the amplified output of the angular velocity sensor (hereinafter, shake detection signal) is converted into a digital signal by an A / D converter (hereinafter, referred to as an A / D converter) in order to perform a shake correction control calculation and a reference value calculation in the microcomputer. , Digitized) and input to an arithmetic device such as a microcomputer.

FIG. 10 schematically shows the state of digitization. FIG. 10A shows an analog shake detection signal of the angular velocity sensor 10 to which the angular velocity due to camera shake is added, which is amplified by an amplifier circuit. FIG. 10 (b)
Is a signal obtained by digitizing the analog shake detection signal. From FIG. 10B, it can be seen that in the digitization of the shake detection signal, a fine value smaller than the resolution cannot be obtained.

As described above, vibration may occur even when the camera is attached to a tripod, as well as when attached to a monopod. However, in general, even in such a case, the shake amount is small as compared with the hand-held state. This is schematically shown in FIG. Similarly to FIG. 10A, the analog shake detection signal is amplified, but the amplitude is smaller than the shake detection signal due to the hand shake shown in FIG. 10A. FIG. 10D is a digital representation of this as shown in FIG. 10B. FIG.
As can be seen from (d), a signal corresponding to the vibration is output at the analog signal stage in FIG.
Since the amplitude is small, the vibration component is buried when digitized, and the digital signal of FIG. 10D hardly detects the vibration.

In this case, even if the shake correction is performed using this shake signal, the vibration itself is not detected, so that it is the same as stopping the shake correction after all. , Can not be done. Therefore, in the related art, there is a problem that even if the blur correction is performed at the time of attaching the tripod or the monopod, the effect cannot be expected so much.

Further, as described above, in the method in which the shake correction is stopped when the tripod is attached, the shake correction is not performed when the tripod is attached.

Further, there is a method of providing a switch for stopping the image blur correction and prompting the user to stop when the tripod is mounted. In this method, when the tripod is mounted, the blur correction is not performed. The switch must be operated in the stop direction every time the camera is fixed to a tripod, which is troublesome, and there is a problem that the photograph is blurred due to forgetting to return the switch.

An object of the present invention is to provide a shake detecting device and a shake correction camera which can perform a high-precision shake correction without requiring any special operation even in a small vibration state such as when a tripod is attached. It is.

[0016]

The present invention solves the above-mentioned problems by the following means. In addition, in order to make it easy to understand, description is given with reference numerals corresponding to the embodiment of the present invention, but the present invention is not limited to this. That is, according to the first aspect of the present invention, there is provided a vibration detecting unit (10) for detecting a vibration state and outputting a detection signal, and a holding state determining unit (14) for determining a holding state of a device including the vibration detecting unit.
0, 150) and a signal processing unit (20, 3) that processes the detection signal based on the determination result of the holding state determination unit.
0, 160).

According to a second aspect of the present invention, the shake detecting apparatus according to the first aspect further includes an amplifying section (20) for outputting an amplified signal obtained by amplifying the detection signal, and the signal processing section includes: A shake detection device characterized by changing an amplification factor of the amplified signal.

According to a third aspect of the present invention, in the shake detecting apparatus according to the second aspect, the signal processing unit is configured to perform the amplification when the holding state determination unit determines that the vibration of the device is small. This is a shake detection device characterized by increasing the rate.

According to a fourth aspect of the present invention, in the shake detecting apparatus according to the first aspect, the signal processing section changes a resolution at which the detection signal is A / D converted. It is.

According to a fifth aspect of the present invention, in the shake detecting apparatus according to the fourth aspect, the signal processing section performs an A / D conversion of the detection signal, and then calculates a value obtained by averaging data of several sections before and after the sampling data. A shake detection device, wherein the sampling data is used.

The invention of claim 6 is the invention of claims 1 to 5
Is a fixed state detection unit (13) for detecting whether or not the device is fixed to a fixing member.
0), wherein the holding state determination unit makes a determination based on a detection result of the fixed state detection unit.

According to a seventh aspect of the present invention, in the shake detecting device according to the sixth aspect, the fixed state detecting section includes a switch (130) whose state changes when the device is fixed to the fixing member. ).

The invention of claim 8 is the first to fifth aspects of the present invention.
3. The shake detection device according to claim 1, wherein the holding state determination unit makes a determination based on the detection signal or the amplified signal.

[0024] The ninth aspect of the present invention relates to the first to eighth aspects.
A shake detection device according to any one of the above, a reference value calculation unit (40) for calculating a shake reference value based on the detection signal or the amplified signal, and a shake correction optical system (70) for correcting shake. A drive unit (6) for driving the shake correction optical system.
0), a drive signal is calculated based on the reference value calculated by the reference value calculation unit and the detection signal or the amplified signal, and a drive control unit (5) controls the drive of the drive unit.
0).

[0025]

Embodiments of the present invention will be described below in more detail with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram for explaining an outline of a shake detection apparatus and a shake correction camera according to a first embodiment of the present invention. Note that the same reference numerals are given to portions that perform the same functions as those of the above-described conventional example, and redundant description will be omitted as appropriate.

The half-press switch SW1 is a switch that is turned on in conjunction with a half-press operation of a release button (not shown). When the half-press switch SW1 is turned ON, a series of photographing preparation operations such as photometric calculation by a photometric unit (not shown) and autofocus driving by an autofocus driving unit (not shown) are started.

The full-press switch SW2 is turned on in conjunction with a full-press operation of further pressing the release button. When this switch is turned on, a series of photographing operations such as opening and closing of a shutter by a shutter mechanism (not shown) and winding of a film by a film winding mechanism (not shown) are performed.

The half-press timer 100 includes a half-press switch S
It turns on at the same time as W1 turns on, and remains on while the half-press switch SW1 is on, and remains on for a certain period of time after the half-press switch SW1 turns off. Timer. This half-press timer 100 starts counting at the same time as
During the period, counting is continued.

The power supply section 110 is a section for supplying power to each section of the camera, here, the angular velocity sensor 10.
While the half-press timer 100 of the camera is ON, the angular velocity sensor 1
Continue to supply power to 0. When the half-press timer 100 is OFF, the power supply unit 110
Stop supplying power to the Therefore, the vibration of the camera can be detected by the angular velocity sensor 10 only while the half-press timer 100 of the camera is ON.

The angular velocity sensor 10 is a sensor for detecting the vibration applied to the camera as an angular velocity value, detects the angular velocity using the Coriolis force, and outputs the detection result as a voltage value. Normally, two angular velocity sensors 10 are mounted because it is necessary to detect angular velocity in two axial directions, but here, one axis is not shown for simplicity. Angular velocity sensor 1
The shake detection signal, which is the output of 0, is transmitted to the amplifier 20.

The tripod mounting screw hole 120 is provided for the tripod screw 1
Reference numeral 25 denotes a screw hole for attaching a camera to a tripod or monopod, and a tripod attachment detection switch 130 is provided at the bottom.

The tripod attachment detection switch 130 is a switch for detecting whether or not a tripod is attached to the camera body 90. FIGS. 2A and 2B are diagrams illustrating the relationship between the tripod attachment detection switch 130 and the tripod screw 125 in a state where the tripod is not attached and in a state where the tripod is attached, respectively. The tripod mount detection switch 130 includes a switch body 132 and a pin 134 that can be freely inserted into the switch body 132.
Consists of When the tripod screw 125 is not attached as shown in FIG. 2A, the pin 134 extends from the switch body 132, and the tip of the pin 134 projects into the tripod mounting screw hole 120. ing.
When the tripod is attached to the camera, the tripod screw 125 on the tripod side connects the pin 134 to the switch body 1 as shown in FIG.
32, and the attachment of the tripod is detected. The signal indicating the state of the tripod attachment detection switch 130 is transmitted to the amplification control unit 140.

The amplification control unit 140 determines the holding state of the camera based on the state of the tripod attachment detection switch 130, and changes the amplification factor of the amplification unit 20.
When the tripod attachment detection switch 130 detects the attachment of the tripod, it sends a command to the amplification unit 20 to increase the amplification factor. If no tripod attachment is detected, a command is sent to lower the amplification factor. Information on which amplification factor to use is also sent to the drive signal calculation unit 50.

The amplifying unit 20 is an amplifying unit that amplifies the output voltage value (vibration detection signal) of the angular velocity sensor 10. The amplification unit 20 changes the amplification factor based on a command from the amplification control unit 140. The first embodiment has a two-stage state of a high amplification state and a low amplification state, and is usually set to the lower state. However, when the attachment of the tripod is detected by the tripod attachment detection switch 130 and the amplification control unit 140 sends a command to set a state at the time of detection of attachment of the tripod, the amplification factor is changed to a high state.
The amplified shake detection signal is transmitted to the A / D converter 30.

The A / D converter 30 is a signal converter that converts an analog shake detection signal sent from the amplifier 20 into a digital signal. By converting the shake detection signal into a digital signal, arithmetic processing in the one-chip microcomputer 200 becomes possible.

The reference value calculating section 40 calculates a reference value for calculating a drive signal from the shake detection signal transmitted from the A / D converter 30. As an example of an arithmetic expression of the reference value,

[0037]

(Equation 1)

The moving average value of the shake detection signal represented by
You. Here, ω is a shake detection signal, ω ₀Is the run-out standard
Values and the suffixes attached to these variables are
This is a variable representing elapsed time (sampling). Reference value performance
The reference value calculated by the calculation unit 40 is sent to the drive signal calculation unit 50.
Sent.

The drive signal calculation unit 50 includes an A / D converter 30
A drive signal for driving the blur correction lens 70 is calculated based on the shake detection signal transmitted from the controller and the information on the reference value transmitted from the reference value calculator 40 and the amplification factor transmitted from the amplification controller 140. This is a drive signal calculation (control) unit. Here, the angular velocity signal is converted into an angular displacement signal by subtracting a reference value from the shake detection signal and performing an integration operation, and is further multiplied by a coefficient based on the amplification factor information to drive the blur correction lens 70. Convert to a signal. The following expression is an example of a drive signal calculation.

[0040]

(Equation 2)

Here, C is a coefficient that changes according to the amplification factor and also changes according to the focal length of a photographic lens (not shown) and other conditions. The drive signal calculated in this way is transmitted to the drive unit 60.

The driving section 60 is a driving section for driving the blur correction lens 70 based on the driving signal transmitted from the driving signal calculating section 50.

The blur correction lens 70 is a part of an image forming optical system built in a lens barrel 80 of the photographing apparatus, and has a light axis I
A single lens that can move in a plane substantially orthogonal to
Alternatively, it is a lens group composed of a plurality of lenses. Driven by the drive unit 60 in a direction substantially orthogonal to the optical axis I, the optical axis I of the imaging optical system is changed.

The blur of a photograph or the like is caused by the movement of an image on an image forming surface (film surface) during exposure due to vibration such as camera shake applied to a camera or the like. However, in a shake correction camera as shown in FIG. 1, a vibration detection sensor such as an angular velocity sensor 10 is built in.
The vibration applied to the camera or the like can be detected by the vibration detection sensor. Then, when the vibration applied to the camera or the like is detected, the movement of the image on the imaging surface due to the vibration can be known, so that the blur correction lens 70 is driven so that the movement of the image on the imaging surface stops. By doing so, it is possible to correct the movement of the image on the imaging plane, that is, the blur.

FIG. 3 is a diagram showing the internal configuration of the amplification section 20. The amplifier 20 includes an OP amplifier 22 and a changeover switch 2
4 and an inverting amplifier including resistors R, R1, and R2.
Here, the magnitude relationship between the resistors R, R1, and R2 is R1> R2
> R.

The changeover switch 24 is a switch for switching the connection between the terminal A and the terminal B based on a command from the amplification control section 140. In the first embodiment, the terminal A is switched to the terminal A when the attachment of the tripod is detected, and to the terminal B when the attachment of the tripod is not detected.

Here, the input from the angular velocity sensor 10 is V
ω, the output of the amplifier 20 is Vω ′, and the reference voltage applied to the non-inverting input terminal of the OP amplifier 22 is Vs.
And Vω ′ are as follows.

[0048]

(Equation 3)

In the above two equations, the second term on the right side is a term representing signal amplification. The difference between the input Vω from the angular velocity sensor 10 and the reference voltage Vs, that is, the shake detection signal is a constant determined by the resistance ratio. It shows that it is amplified. Therefore, R1
> R2, in FIG. 3, the amplification factor is higher when the changeover switch 24 is on the A side.

When the camera is fixed on a tripod,
The swing amount is smaller than when the hand is held. Then, as described in the problem, a situation in which the shake detection signal is buried in the resolution of the A / D converter easily occurs.
In order to avoid such a situation, in the first embodiment, when a tripod attachment is detected by the tripod attachment detection switch 130, the amplification control unit 140 switches the changeover switch 24.
Is set to the A side, and the amplification factor of the amplification unit 20 is increased. By doing so, it is also possible to detect a vibration having a small amplitude that is generated when the tripod is attached.

FIG. 4 is a graph comparing the shake detection signals from the amplifier 20 and the A / D converter 30 before and after increasing the gain. FIG. 4A is a graph showing a shake detection signal obtained by amplifying the vibration when the tripod is attached by the small amplification factor (conventional amplification factor) on the B side by the changeover switch 24. FIG. 4B is a graph showing a shake detection signal obtained by converting the shake detection signal of FIG. 4A into a digital signal by the A / D converter 30.

As can be seen from a comparison between FIG. 4A and FIG. 4B, in the analog shake detection signal shown in FIG. Although the shake detection signal shown in FIG.
The vibration is buried in the resolution, and the vibration is not reproduced by a digital signal.

FIG. 4C shows the same vibration as in FIG.
11 is a graph showing a shake detection signal amplified by a changeover switch 24 at a large amplification factor on the A side. FIG. 4 (d)
5 is a graph showing a shake detection signal obtained by converting the shake detection signal of FIG. 4C into a digital signal by the A / D converter 30.

As can be seen from FIGS. 4C and 4D, by detecting the attachment of the tripod and increasing the amplification factor, a shake detection signal having a large amplitude can be obtained even from a small vibration when the tripod is attached. It can be seen that even if this is converted into a digital signal (FIG. 4D), the vibration can be sufficiently reproduced.

As described above, in the first embodiment, when the attachment of the tripod is detected, the amplification rate of the amplification unit 20 that amplifies the shake detection signal from the angular velocity sensor 10 is increased to increase the amplitude of the small vibration. Thus, the reproducibility of the vibration when it is formed is improved, and even if a very small vibration occurs for some reason when the tripod is attached, the blur correction can be performed with high accuracy. In addition, since the photographer does not need to perform any special operation such as turning off the shake correction when the tripod is attached, the usability is improved.

(Second Embodiment) FIG. 5 is a block diagram showing an outline of a shake detecting device and a shake correction camera according to a second embodiment of the present invention. In the second embodiment, the holding state of the camera is determined by the holding state determination unit 150 provided in the one-chip microcomputer 200 without using the tripod attachment detection switch 130. In the description of the second embodiment and the third embodiment, description of parts common to the first embodiment will be omitted.

The A / D converter 3
The determination unit determines the holding state of the camera from the digital shake detection signal output from 0 and determines the amplification factor. For example, when the amplitude of the shake detection signal from the A / D converter 30 continues to be smaller than a predetermined value (tentatively V), it is determined that the tripod is attached, and the amplification factor of the amplification unit 20 is maximized. A command is sent to the amplification unit 20 to raise the power. When the amplitude of the shake detection signal from the A / D converter 30 is larger than V, the optimum amplification factor is determined based on the amplitude, and the amplification factor is transmitted to the amplification unit 20. The holding state determination unit 150 also transmits information on the determined amplification factor to the drive signal calculation unit 50.

FIG. 6 shows an amplifier 2 according to the second embodiment.
FIG. 3 is a diagram illustrating an internal configuration of a “0”. The amplifying unit 20 according to the second embodiment includes the changeover switch 24 according to the first embodiment,
A resistor Rc and a variable resistor Rv are provided instead of the resistors R1 and R2. Based on the command related to the amplification factor transmitted from the holding state determination unit 150, the amplification unit 20
Since the value of v is changed, the amplification factor of the amplifying unit 20 also changes in conjunction with this.

As described above, in the second embodiment, since the tripod attachment detection switch 130 is not required, it is not necessary to attach the tripod to the tripod as in the first embodiment. Can respond to the situation. Also, it is possible to cope with a case where a photographer with a small camera shake, such as an advanced user and a professional photographer, uses the camera. Further, since there is no tripod mounting detection switch, the number of parts is reduced, and as a result, the cost is reduced and the number of failures is reduced.

On the other hand, the holding state determination unit 150 determines the holding state based on the amplitude of the actual vibration of the camera, so that the determination can be made more accurately and the optimal amplification factor suitable for the magnitude of the vibration can be obtained. Can be set steplessly, so that more precise blur correction can be performed.

(Third Embodiment) FIG. 7 is a block diagram showing an outline of a shake detection device and a shake correction camera according to a third embodiment of the present invention. The third embodiment is different from the second embodiment in that the amplification factor of the amplification unit 20 is fixed, and another method is used to deal with small-amplitude vibration. Hereinafter, portions different from the second embodiment will be described.

The amplification section 20 has a fixed amplification factor for amplifying the shake detection signal, and transmits the amplified shake detection signal to the A / D converter 30.

The holding state judging section 150 judges the holding state of the camera in the same manner as in the second embodiment.
The determination unit selects the number of samples of the shake detection signal to be averaged at 0. The holding state determination unit 150 selects a small number of samples when the holding state of the camera is determined to be a state of large shake, and selects a large number of samples when determined to be a state of small shake, and stores the information. Average calculation unit 160
Send to

The averaging section 160 includes the holding state determination section 15
The average of the shake detection signals digitized by the A / D converter 30 is obtained according to the number of samples determined by 0. An example of an equation used for calculating the average is shown below.

[0065]

(Equation 4)

Here, K2 is the number of samples selected by the holding state determination unit 150, and changes according to the detected vibration.

FIG. 8 shows an amplifier 2 according to the third embodiment.
7 is a graph showing an example of an output signal output from the averaging unit 160 via 0 and the A / D converter 30. FIG.
(A) is a graph showing a shake detection signal obtained by amplifying the vibration when the tripod is attached by the amplifying unit 20. Since it is fixed to a tripod, the amplitude of the vibration obtained here is thus small. FIG. 8B shows the detection signal of FIG.
5 is a graph showing a signal converted into a digital signal by the / D converter 30. This waveform has a low resolution, and thus has a waveform like a rapidly changing vibration. FIG. 8 (c)
9 is a graph showing a signal obtained by averaging the detection signal of FIG. in this way,
When averaging is performed, the resolution is improved in a pseudo manner, so that the waveform becomes smooth and approximates the actual vibration waveform.

As described above, the third embodiment has the following effect in addition to the effect of not requiring the tripod attachment detection switch 130, as in the second embodiment. That is, as compared with the shake detection apparatus and the shake correction camera according to the prior art, it is possible to cope with a vibration state with a small amplitude without increasing the number of electric circuit components, so that the occurrence of failures is reduced, and the shake detection apparatus and the shake correction apparatus. The reliability of the correction camera is improved. In addition, since it is not necessary to add a new component, it is possible to provide a shake detection device and a shake correction camera that can cope with a vibration state having a small amplitude at the same cost as a conventional product.

(Modifications) Various modifications and changes are possible without being limited to the embodiments described above, and they are also within the equivalent scope of the present invention.

(1) In the first to third embodiments, the A / D converter 30, the reference value calculator 40, the drive signal calculator 50, the amplification controller 140, and the holding state determiner 150
Is used in the one-chip microcomputer 200. However, the present invention is not limited to this example. For example, a part may be provided externally or all may be provided as separate parts.

(2) In the second embodiment, the amplification factor is
Although there is no step, the present invention is not limited to this, and a plurality of steps having different resistance values may be arranged according to the magnitude of the vibration and changed to a plurality of steps.

(3) In the first to third embodiments, only one direction of vibration is shown for simplicity, but normally, vibration in two directions (hereinafter referred to as X and Y directions) is used. Since detection and processing are performed, signal processing may be performed on the detection signals in the X and Y directions. For example, when the shake in the X direction is large and the shake in the Y direction is small, the gain in the Y direction may be increased while the original gain in the X direction remains unchanged.

(4) In the first to third embodiments, the tripod detection switch 130 and the holding state determination unit 150
Is shown as another embodiment, the method of changing the amplification factor and the method of calculating the average value are also shown as another embodiment,
These may be used in appropriate combination. For example, the tripod detection switch 130 is combined with the holding state determination unit 150, and the tripod detection switch 130 is turned on (O
N), but if the shake does not become smaller than the predetermined value, it is determined to be a monopod. May be increased.

(5) In the first to third embodiments, the processing such as the change of the amplification factor is performed once, but is not limited to this, and may be performed a plurality of times. For example, when the vibration is further reduced during vibration detection with the amplification factor increased, the amplification factor may be further increased.

(6) In the first to third embodiments, the processing itself performed by the A / D converter has been described as an example in which the resolution itself of the A / D converter can be changed. It may be used, or a plurality of A / D converters may be selected.

(7) In the first to third embodiments, the arithmetic expression of the reference value is not limited to the method shown in Expression 1, and for example, a low-pass filter may be used.

(8) In the first embodiment, the tripod attachment detection switch 130 is moved
Although an example in which the tripod screw 125 is detected has been described, the present invention is not limited to this. For example, an optical sensor or the like may be used.

[0078]

As described above in detail, according to the first aspect of the present invention, a detection signal for detecting the state of vibration is output, and the detection signal is processed based on the determination result of the holding state of the apparatus. Therefore, the detection signal of the vibration used for various control of the apparatus can be made an optimal signal for signal processing for each state of the vibration, and more reliable and highly effective control of the apparatus can be performed.

According to the second aspect of the present invention, the signal processing unit comprises:
Since the amplification rate of the amplified signal that has amplified the detection signal is changed,
Regardless of the magnitude of the vibration, a signal optimal for signal processing can be obtained, and more reliable and highly effective control of the device can be performed.

According to the third aspect of the present invention, the signal processing unit comprises:
When the holding state determination unit determines that the apparatus is in the holding state in which the vibration of the apparatus is small, the amplification factor is increased. Therefore, even in an apparatus in which the vibration is small and in a relatively stable state, it is necessary for signal processing. An amplitude can be obtained, and a shake detection device that can respond to even a slight vibration can be provided.

According to the fifth aspect of the present invention, the signal processing unit comprises:
After A / D conversion of the detection signal, a value obtained by averaging data in several sections before and after the sampling data is used as the sampling data, so that the data after the A / D conversion changes smoothly,
A vibration detection device that can obtain a vibration detection signal close to an actual vibration waveform can be provided.

According to the sixth aspect of the present invention, the determination of the holding state is performed based on the detection result of whether or not the device is fixed to the fixing member, so that the determination is reliable and accurate signal processing can be performed. I can do it.

According to the seventh aspect of the present invention, since the fixed state detecting section is a switch that changes its state when the apparatus is fixed to a tripod, the determination when the apparatus is fixed to a tripod can be assured. And a shake detection device capable of performing accurate signal processing.

According to the eighth aspect of the present invention, since the holding state determination unit determines the holding state based on the detection signal or the amplified signal, a special fixed state detection unit is not required. A shake detection device capable of performing accurate signal processing at a low price can be provided.

According to the ninth aspect of the present invention, since the above-described shake detecting device is provided in the shake correcting camera, optimal signal processing can be performed for each detected vibration, so that accurate and highly effective shake correction can be performed.

[0086]

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a tripod attachment detection switch 130 according to the first embodiment.

FIG. 3 is a diagram illustrating details of an internal configuration of an amplification unit 20 according to the first embodiment.

FIG. 4 is a graph comparing before and after amplification of a shake detection signal according to the first embodiment.

FIG. 5 is a diagram illustrating a second embodiment of the present invention.

FIG. 6 is a diagram illustrating details of an internal configuration of an amplification unit 20 according to the second embodiment.

FIG. 7 is a diagram illustrating a third embodiment of the present invention.

FIG. 8 is a graph comparing before and after averaging of a shake detection signal in a third embodiment.

FIG. 9 is a diagram illustrating a conventional technique.

FIG. 10 is a graph showing a shake detection signal according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Angular velocity sensor 20 Amplification part 30 A / D converter 40 Reference value calculation part 50 Drive signal calculation part 60 Drive part 70 Shake correction lens 130 Tripod attachment detection switch 140 Amplification control part 150 Holding state judgment part 160 Average calculation part

Claims (9)

[Claims] A vibration detection unit that detects a state of vibration and outputs a detection signal; a holding state determination unit that determines a holding state of a device including the vibration detection unit; and a determination result of the holding state determination unit. And a signal processing unit that processes the detection signal based on the detection signal. 2. The shake detection device according to claim 1, further comprising: an amplification unit that outputs an amplified signal obtained by amplifying the detection signal, wherein the signal processing unit changes an amplification factor of the amplified signal in the amplification unit. A shake detection device. 3. The shake detection device according to claim 2, wherein the signal processing unit increases the amplification factor when the holding state determination unit determines that the vibration of the device is in a small holding state. A shake detection device characterized by the following. 4. The shake detection apparatus according to claim 1, wherein the signal processing unit changes a resolution at which the detection signal is subjected to A / D conversion. 5. The shake detection apparatus according to claim 4, wherein the signal processing unit performs A / D conversion on the detection signal and averages data of several sections before and after the sampling data to obtain the sampling data. A shake detection device, characterized in that: 6. The shake detection device according to claim 1, further comprising: a fixed state detection unit configured to detect whether the device is fixed to a fixing member, wherein the holding state determination unit includes: Making a determination based on a detection result of the fixed state detection unit. 7. The shake detection device according to claim 6, wherein the fixed state detection unit is a switch whose state changes when the device is fixed to the fixing member. Shake detection device. 8. The shake detection device according to claim 1, wherein the holding state determination unit makes a determination based on the detection signal or the amplified signal. 9. A shake detecting device according to claim 1, a reference value calculating unit for calculating a shake reference value based on the detection signal or the amplified signal, and a shake correction. A shake correction optical system, a drive unit for driving the shake correction optical system, a reference value calculated by the reference value calculation unit, and a drive signal based on the detection signal or the amplified signal. A drive control unit that controls driving of the drive unit.