JPH08219869A - Vibration detecting apparatus - Google Patents

Abstract

PURPOSE: To detect the information of both rotary movement and parallel movement with high precision and at low cost by adding and subtracting output signals from a plurality of accelerating sensors. CONSTITUTION: In the case where a middle point C and a rotary center point (O) of accelerating sensors 1a, 1b are mutually conformed, the acceleration signals S1 , S2 sent out of the sensors 1a, 1b have the same amplitude and different phases by 180 degrees. An adder 4 of a signal processing part 3 carries out addition process for the signals S1 , S2 and sends out a zero level signal S3 . Meanwhile, a computer 5 carries out subtraction process of the signal S2 from the signal S1 and sends out a signal S4 with the same phase as that of the signal S1 and amplitude two times as high as that of the signal S1 . On the other hand, in the case where the sensors 1a, 1b move in parallel in vertical directions, the signals S1 and S2 have the same amplitude and the same phase and the signal S3 has the same phase as that of the signal S1 and an amplitude two times as high as that of the signal S1 and the signal S4 becomes a zero level signal. In this way, the signal S3 and the signal S4 can respectively show information of parallel movement degree and movement degree in the rotary direction of the base 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration detecting device, and is suitable for detecting vibration generated when a video camera is used for photographing.

[0002]

2. Description of the Related Art In recent years, a camcorder in which a video camera and a VTR are combined and integrated has become popular. Some of these camcorders have a camera shake correction function, and a vibration detection device is installed to detect camera shake.

The vibration detecting device has, for example, two angular velocity sensors.
Individual pieces are provided, and the angular velocity sensor detects the vertical and horizontal rotation movements. For example, a camcorder is designed to perform a predetermined process on a detection signal detected by the vibration detecting device to correct an image to prevent shaking.

[0004]

By the way, since the vibration detecting device is designed to detect the angular velocity by the angular velocity sensor, it is possible to detect the movement in the up and down and left and right rotation directions, but there is no change in the angle. It has a drawback that it cannot detect vertical and horizontal translations.

For this reason, for example, in the case of photographing a long-distance subject in which the hand shake of the user causes vibration in the rotation direction, image correction is performed, but a short-distance subject in which the hand shake of the user causes vibration in the vertical direction is taken. Image correction could not be performed when shooting.

Further, since the angular velocity sensor is expensive,
There is also a problem that the vibration detecting device is expensive.

The present invention has been made to solve such a problem, and an object thereof is to provide a vibration detecting device capable of detecting both rotational movement and parallel movement.

[0008]

In order to achieve the above object, a plurality of vibration detecting means fixed on a base and a required calculation are performed on signals detected by the plurality of vibration detecting means, And a signal processing means capable of outputting the rotational movement information and the parallel movement information. The vibration detecting means is formed by an acceleration sensor.

[0009]

According to the present invention, the signal processing means performs a required calculation on the signals detected by the plurality of vibration detection means, and the movement information in the rotation direction and the movement information in the parallel direction can be output.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is a diagram showing a vibration detecting device according to a first embodiment of the present invention. The acceleration sensors 1a and 1b are composed of, for example, an electret condenser or the like, and are configured to be able to detect acceleration on a directional detection surface. That is, if the detection surface is provided in the horizontal direction, it is possible to detect the vertical acceleration, and in this case, the horizontal acceleration is not detected. The acceleration sensors 1a and 1b are fixed to both ends of the base 2.

The signal processing unit 3 is composed of an adder 4 and a subtractor 5, and the adder 4 and the subtractor 5 perform predetermined arithmetic processing on the acceleration signals detected by the acceleration sensors 1a and 1b. A parallel control signal and a rotation control signal are output.

The operation of the vibration detecting device as described above will be described below with reference to FIGS. FIG. 2 is a diagram showing the operation of the vibration detecting device of this embodiment when the midpoint C of the acceleration sensors 1a and 1b and the center point O of rotation coincide with each other. In this case, the acceleration sensors 1a and 1b provided on the base 2 detect the same acceleration in vertically different directions with respect to the center point O and output it as an acceleration signal.

That is, as shown in FIG. 2, the acceleration signal S ₁ output from the acceleration sensor 1a and the acceleration signal S ₂ output from the acceleration sensor 1b have the same amplitude but different phases by 180 degrees. Becomes

The acceleration signal S ₁ and the acceleration signal S ₂ are added / subtracted by an adder 4 and a subtractor 5 provided in the signal processing unit 3. Since the adder 4 performs addition processing on the acceleration signal S ₁ and the acceleration signal S ₂ having the same amplitude but different phases by 180 degrees, the signal S ₃ output from the adder 4 is a zero level signal as shown in FIG. Becomes

On the other hand, since the subtractor 5 subtracts the acceleration signal S ₂ from the acceleration signal S _{1, the} signal S ₄ output from the subtractor 5 has the same phase as the acceleration signal S ₁ as shown in FIG. The signals are the same and the amplitude level is doubled.

On the other hand, when the vibration detecting device is translated in the vertical direction, the result is as shown in FIG. In this case, since the acceleration sensors 1a and 1b provided on the base 2 simultaneously move in the vertical direction, the acceleration sensors 1a and 1b
In b, the same acceleration in the same direction will be detected,
The acceleration signals S ₁ and S ₂ have the same amplitude and phase as shown in FIG.

Therefore, as shown in the figure, the output signal S ₃ from the adder 4 to which the acceleration signal S ₁ and the acceleration signal S ₂ are added is in phase with the acceleration signal S ₁ and the amplitude level is doubled. Signal.

On the other hand, since the subtractor 5 subtracts the acceleration signal S ₂ output from the acceleration sensor 1b from the acceleration signal S ₁ output from the acceleration sensor 1a, the signal S ₄ output from the subtractor 5 is As shown in the figure, it becomes a zero level signal.

As can be seen from FIGS. 2 and 3, the signal S ₃ output from the adder 4 of the signal processing unit 3 indicates the amount of movement of the base 2 in parallel and is output from the subtractor 5. The signal S ₄ that indicates that the information indicates the amount of movement of the base 2 in the rotational direction.

FIG. 4 is a diagram showing an example of the operation when the center point O of the rotational movement of the acceleration sensors 1a and 1b is far away from the acceleration sensors 1a and 1b, and (a) is the central point of the rotational movement. When O is far away from the acceleration sensor 1b, the center point O of the rotational movement is shown in FIG.
It is the figure which each showed the case where it is distant far to the a side.

When the center point O is far away from the acceleration sensor 1b as shown in FIG. 4 (a), the acceleration sensors 1a and 1b on the base 2 detect different accelerations in the same direction. Signal S ₁ and acceleration signal S
_As shown in the figure, ₂ is a signal with the same phase but different amplitude.

Therefore, the signal S ₃ output from the adder 4 of the signal processing unit 3 is a signal obtained by adding the acceleration signal S ₁ and the acceleration signal S ₂ as shown in FIG. 4A.
The signal S ₄ output from the subtractor 5 is a signal obtained by subtracting the acceleration signal S ₂ from the acceleration signal S ₁ as shown in the figure.

Further, as shown in FIG. 4B, when the center point O is distant from the acceleration sensor 1a, the acceleration signals S ₁ and S output from the acceleration sensors 1a and 1b on the base 2 are output. _{2 is} also a signal with the same phase but different amplitude as shown in the figure.

Therefore, the signal S ₃ output from the adder 4 of the signal processing unit 3 becomes a signal obtained by adding the acceleration signal S ₁ and the acceleration signal S ₂ as shown in FIG. 4B.
The signal S ₄ output from the subtractor 5 is a signal obtained by subtracting the acceleration signal S ₂ from the acceleration signal S ₁ .

As described above, when the center point O of the rotational movement is far away from the acceleration sensors 1a and 1b, the signal S ₃ indicating the parallel movement of is a signal having the same phase regardless of the position of the center point O. As a result, the signal S ₄ indicating the rotational movement has a different phase depending on the position of the center point O.

On the other hand, FIG. 5 is a diagram showing an example of the operation when the center point O of the rotational movement is slightly deviated from the intermediate point C of the acceleration sensors 1a and 1b, and (a) is the central point of the rotational movement. When O is on the acceleration sensor 1a side from the midpoint C of the acceleration sensors 1a and 1b, (b) shows the case where the center point O of the rotational movement is on the acceleration sensor 1b side from the midpoint C of the acceleration sensors 1a and 1b. It is the figure shown.

As shown in FIG. 5A, when the center point O of the rotational movement is slightly displaced from the intermediate point C of the acceleration sensors 1a and 1b toward the acceleration sensor 1a side, the acceleration sensors 1a and 1b on the base 2 are Since different accelerations in different directions are detected, the acceleration signal S ₁ and the acceleration signal S ₂
Are signals with different phases and amplitudes as shown in the figure.

Therefore, the signal S ₃ output from the adder 4 of the signal processing unit 3 becomes a signal obtained by adding the acceleration signal S ₁ and the acceleration signal S ₂ as shown in FIG. The signal S ₄ output from 5 is a signal obtained by subtracting the acceleration signal S ₂ from the acceleration signal S ₁ as shown in the figure.

Further, as shown in FIG. 5B, when the center point O of the rotational vibration is deviated to the acceleration sensor 1b side from the intermediate point C of the acceleration sensors 1a and 1b, the acceleration sensors 1a and 1b on the base 2 are arranged. Since different accelerations in different directions are detected in, the acceleration signal S ₁ and the acceleration signal S
₂ is a signal with different phase and amplitude as shown in the figure.

Therefore, the signal S ₃ output from the adder 4 of the signal processing unit 3 becomes a signal obtained by adding the acceleration signal S ₁ and the acceleration signal S ₂ as shown in FIG. The signal S ₄ output from 5 is a signal obtained by subtracting the acceleration signal S ₂ from the acceleration signal S ₁ as shown in the figure.

As described above, when the center point O of the rotational movement is slightly deviated from the intermediate point C of the acceleration sensors 1a and 1b, the phase of the signal S ₃ indicating the parallel movement information differs depending on the position of the center point O. The signal is output, and the signal S ₄ indicating the rotational movement information is output in the same phase regardless of the position of the center point O.

As can be seen from FIGS. 2 to 5, the signal processing
Signal S output from the processing unit 3₃ , S _Four Is in addition to base 2
Signals corresponding to various operations such as parallel translation and rotational movement
Becomes That is, the signal S output from the adder 4₃ Is
The signal S which becomes the parallel movement information and is output from the subtracter 5_Four 
Is the rotational movement information. Therefore, the vibration detection of the present embodiment
In the device, parallel movement and rotation movement at various rotation axis positions
Both can be detected.

FIG. 6 shows, as a second embodiment of the present invention, a vibration detecting device capable of detecting vibration in two axial directions.
The acceleration sensors 1a, 1b, 1c are composed of, for example, an electret condenser or the like, and are capable of detecting acceleration on a directional detection surface.

In the case of this embodiment, for example, the acceleration sensors 1a and 1b arranged on the X-axis are used to detect the vertical acceleration, and the acceleration sensors 1b and 1c arranged on the Y-axis are used. It is designed to detect the acceleration in the lateral direction. Then, the acceleration sensors 1a, 1b,
1c is fixed on the L-shaped base 6 for vibration detection.

As a result, the vertical vibrations of the device are detected by the acceleration sensors 1a and 1b and are supplied as acceleration signals to the adder 4a and the subtractor 5a of the signal processing unit 3a. The adder 4a calculates the amount of parallel movement of the base 6 in the vertical direction in the vertical vibration as parallel movement information, and the subtracter 5a rotates the base 6 in the vertical direction in the vertical vibration. The calculated movement amount is calculated and output as rotational movement information.

Further, the left and right vibrations are generated by the acceleration sensor 1b,
1c, and is supplied to the adder 4b and the subtractor 5b of the signal processing unit 3a as an acceleration signal. Then, the adder 4b calculates the amount of parallel movement of the base 6 in the vertical direction in the left and right vibrations as parallel movement information, and the subtractor 5b rotates the base 6 in the horizontal direction in the left and right vibrations. The calculated movement amount is calculated and output as rotational movement information.

Therefore, if the camera shake correction of a video camera such as a camcorder is performed using the parallel movement information and the rotation movement information output from the signal processing unit 3a as a control signal, the vertical movement and the horizontal movement due to the hand movement and the parallel movement are corrected. can do.

Further, since one of the acceleration sensors for detecting the vertical vibration and one of the acceleration sensors for detecting the left and right vibrations are commonly used and fixed on the same base, the vertical and horizontal directions are fixed. The number of acceleration sensors can be reduced and the cost can be reduced by separately providing the vibration detection device.

FIG. 7 shows a vibration detecting device for detecting vibration in two axial directions using a microcomputer which is a third embodiment of the present invention. In this case, for example, the acceleration sensors 1a and 1b arranged on the X-axis detect upper and lower vibrations, and the acceleration sensors 1b and 1c arranged on the Y-axis detect left and right vibrations. Has been done.

The acceleration signal output from the acceleration sensor 1a is sent to the A / D converter 8 via the amplifier 7a.
It is supplied to a, where it is converted from an analog signal to a digital signal and supplied to a microcomputer 9 (hereinafter referred to as a microcomputer). Similarly, the acceleration sensors 1b and 1c
The acceleration signal output from is also supplied to the A / D converters 8b and 8c via the amplifiers 7b and 7c, is converted from an analog signal into a digital signal, and is supplied to the microcomputer 9.

Then, the microcomputer 9 performs a predetermined addition / subtraction process to output the vertical and horizontal rotational movement information and the parallel movement information. In this way, the analog acceleration signals output from the acceleration sensors 1a, 1b, 1c are converted into A / D signals via the amplifiers 7a, 7b, 7c.
Converted into digital signals with converters 8a, 8b, 8c,
If the microcomputer 9 performs arithmetic processing, the microcomputer 9
The control signal output from is a signal with higher accuracy.

Therefore, if the camera shake correction of the video camera such as a camcorder is carried out by using the parallel movement information and the rotational movement information outputted from the microcomputer 9 as the control signals, the camera shake correction can be performed with higher accuracy. Like

The vibration detecting device of the present invention can be applied not only to the camera shake correction function of a video camera such as a camcorder as described above, but also to various devices such as an attitude control device. Nor. Also,
It is also possible to use sensor means other than the acceleration sensor, such as a speed sensor or an acceleration sensor.

[0044]

As described above, in the vibration detecting apparatus of the present invention, a plurality of vibration detecting means are provided, and the signals output from the plurality of vibration detecting means are calculated by the signal processing means. Therefore, there is an effect that both the rotational movement information and the parallel movement information can be output. This enables highly accurate vibration detection, and is suitable for application as, for example, a vibration detection device having a camera shake correction function of a video camera such as a camcorder.

Further, since a small and inexpensive acceleration sensor can be used as the vibration sensor, the cost can be reduced as compared with the angular velocity sensor which has been conventionally used, and the miniaturization is facilitated. It is also suitable for implementation of.

[Brief description of drawings]

FIG. 1 is a diagram showing a vibration detection device that is a first embodiment of the present invention.

FIG. 2 is a diagram showing an operation when the vibration detecting device according to the embodiment is rotationally moved at an intermediate point between two acceleration sensors.

FIG. 3 is a diagram showing an operation when the vibration detecting device according to the embodiment moves in parallel.

FIG. 4 is a diagram showing an operation in the case where the vibration detection device according to the embodiment is rotationally moved about a point far from the acceleration sensor as a center point.

FIG. 5 is a diagram showing an operation when the vibration detecting apparatus according to the embodiment is rotationally moved at a point slightly deviated from an intermediate point between two acceleration sensors.

FIG. 6 is a diagram showing a vibration detecting device for detecting vibration in two axial directions according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a vibration detecting device for detecting vibration in two axial directions according to a third embodiment of the present invention.

[Explanation of symbols]

 1a, 1b, 1c Accelerometer 2 Base 3 Signal processor 4 Adder 5 Subtractor 6 L-type base 7a, 7b, 7c Diode 8a, 8b, 8c A / D converter 9 Microcomputer (CPU)

Claims (2)

[Claims] 1. A plurality of vibration detection means fixed on a base, and a required operation is performed on signals detected by the plurality of vibration detection means to output rotational movement information and parallel movement information. A vibration detecting device comprising: a signal processing unit capable of performing the above. 2. The vibration detecting device according to claim 1, wherein the vibration detecting means is formed of an acceleration sensor.