JPH08334804A - Imaging device and lens device having shake correction mechanism - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an imaging device and a lens device including a shake correction mechanism capable of performing highly accurate shake correction against camera shake. An image pickup apparatus having a shake correction mechanism for correcting shake by performing control to change an optical axis of a shake correction optical system including a part or the whole of a shooting optical system based on the detected shake. And a control device for interrupting the control of the shake correction mechanism when a shake occurs due to the image pickup device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing device and a lens device having a shake correcting mechanism.

[0002]

2. Description of the Related Art In recent years, for example, in a photographing device such as a camera
The F device has become popular, and it has been proposed to equip a shake correction mechanism that corrects image shake caused by camera shake at the time of shooting.

For example, in Japanese Patent Laid-Open No. 2-66535, as an example of a single lens optical system, a shake correction mechanism that detects an angular variation of an optical axis caused by camera shake or the like and corrects a picked-up image based on this is provided. Japanese Patent Application Laid-Open No. 2-183217 proposes a shake correction mechanism for correcting camera shake by shifting a part of a photographing optical system of an internal focusing type telephoto lens.

[0004]

By the way, in the case of a single-lens reflex camera, a body device to which a lens device having such a shake correction mechanism is attached is subjected to a mirror-up shock, a shutter curtain traveling vibration, and a film winding. Due to the driving vibration of the motor, the driving vibration of the AF motor, electrical noise, and the like, shake of a large amplitude occurs in a short time.

Therefore, since the above-described conventional shake correction mechanism tries to move following these shakes generated from the body device, it is possible to accurately follow the shake.
That is, high-precision shake correction cannot be performed.

An object of the present invention is to solve the above-mentioned problems and to provide an image pickup apparatus and a lens apparatus having a shake correction mechanism capable of correcting shake with high accuracy.

[0007]

In order to solve the above-mentioned problems, the invention of claim 1 is a control for changing an optical axis of a shake correction optical system which is a part or all of a photographing optical system based on the detected shake. An image pickup apparatus including a shake correction mechanism that corrects the shake by performing the above, and including a control device that interrupts the control of the shake correction mechanism when a shake of the shake caused by the image pickup apparatus occurs. Is characterized by.

According to a second aspect of the present invention, in the image pickup apparatus including the shake correction mechanism according to the first aspect, the control device suspends the control for a time corresponding to a time when the shake occurs.

The invention of claim 3 relates to claim 1 or claim 2.
In the image pickup apparatus including the shake correction mechanism, when the control is interrupted, the shake correction mechanism moves at the moving speed immediately before the start of the interrupt.

According to a fourth aspect of the present invention, there is provided a shake correction mechanism for correcting the shake by performing control to change the optical axis of the shake correction optical system including a part or the whole of the photographing optical system based on the detected shake. It is a lens device, and is provided with a control device that interrupts the control of the shake correction mechanism when a shake of the shake caused by the imaging device occurs.

According to a fifth aspect of the present invention, in the lens device including the shake correction mechanism according to the fourth aspect, the control device suspends the control for a time corresponding to a time when the shake occurs.

The invention of claim 6 is the invention according to claim 4 or claim 5.
In the lens device including the shake correction mechanism, when the control is interrupted, the shake correction mechanism moves at the moving speed immediately before the start of the interrupt.

[0013]

According to the first aspect of the present invention, the shake caused by the photographing device, such as the shock of mirror up, the vibration of the shutter curtain, the drive vibration of the film winding motor, the drive vibration of the AF motor, and the electrical noise. When it is predicted that the occurrence of the above-mentioned phenomenon is predicted in advance, the control of the shake correction mechanism is interrupted, so that the shake correction mechanism moves accurately following the shake caused by only the shake.

According to the invention of claim 2, in the invention of claim 1, the control of the shake correction mechanism is interrupted for a time corresponding to the occurrence time of shake, so that the occurrence timing and length of shake are different, The shake correction mechanism is highly accurate and follows only camera shake.

According to the invention of claim 3, in the invention of claim 1 or 2, when the control of the shake correction mechanism is interrupted, the shake correction mechanism is moved at the moving speed at the start of the shake, so that the shake occurs. The correction mechanism does not move unnecessarily before and after the interruption, and the shake correction control is smoothly performed without the movement of the shake correction mechanism becoming discontinuous.

According to the fourth aspect of the present invention, shakes caused by the body device, such as shock of mirror up, running vibration of shutter curtain, driving vibration of film winding motor, driving vibration of AF motor, and electrical noise. When the occurrence of is predicted in advance, the control of the shake correction mechanism is interrupted.
The shake correction mechanism accurately follows the shake caused by only the shake.

According to the invention of claim 5, in the invention of claim 4, the control of the shake correction mechanism is interrupted for a time corresponding to the occurrence time of shake, so that the body device is connected to any body device. Even if there is, the shake correction mechanism will follow the shake with high accuracy.

According to the invention of claim 6, in the invention of claim 4 or 5, when the control of the shake correcting mechanism is interrupted, the shake correcting mechanism is moved at the moving speed at the time of starting the interrupt. The correction mechanism does not move unnecessarily before and after the interruption, and the shake correction control is smoothly performed without the movement of the shake correction mechanism becoming discontinuous.

[0019]

The present invention will be described in more detail below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an embodiment of an image pickup apparatus having a shake correction mechanism according to the present invention.
FIG. 3 is a configuration diagram schematically showing an image pickup optical system of an image pickup apparatus including a shake correction mechanism according to the present invention.

In this embodiment, the photographing device is composed of a lens device 1 and a body device 2. The lens apparatus 1 is provided with a vibration control microcomputer 3, an ultrasonic motor microcomputer 16, a communication microcomputer 24 and the like, and the body apparatus 2 is provided with a body microcomputer 25 and the like.

The image stabilization control microcomputer 3 is an optical system from the output of the body microcomputer 25 provided in the body device 2 and the encoders such as the X encoder 5, Y encoder 9, distance encoder 15 and zoom encoder 22. Based on the position information, the X-axis drive motor 7, the X-axis motor driver 8, the Y-axis drive motor 11,
The drive of the shake correction drive unit such as the Y-axis motor driver 12 is controlled.

The lens contact 4 is a group of electrical contacts used for exchanging signals between the lens device 1 and the body device 2,
It is connected to a communication microcomputer 24 provided in the lens apparatus 1.

The X encoder 5 detects the amount of movement of the optical system in the X-axis direction, and its output is the X encoder IC 6
Connected to. The X encoder IC 6 converts an optical system movement amount in the X axis direction into an electric signal, and the signal is sent to the image stabilization control microcomputer 3.

The X-axis control motor 7 is a drive motor for driving the shake correction optical system in the X-axis direction, and the X-axis motor driver 8 is a circuit for driving the X-axis drive motor 7. Similarly, the Y encoder 9 detects the amount of movement of the optical system in the Y-axis direction, and its output is connected to the Y encoder IC 10. The Y encoder IC 10 converts the amount of movement of the optical system in the Y-axis direction into an electric signal, and the signal is sent to the image stabilization control microcomputer 3.

The Y-axis control motor 11 has a shake correction optical system Y
It is a drive motor that drives in the axial direction, and the Y-axis motor driver 12 is a circuit that drives the Y-axis drive motor 11.
The image stabilization head amplifier 13 is a circuit that detects the amount of shake that occurs in the lens apparatus 1, and converts image shake information into an electrical signal. The signal is sent to the image stabilization control microcomputer 3. As the image stabilization head amplifier 13, for example, an angle sensor or the like can be used.

The VR switch 14 is a switch for turning on / off the shake correction drive and switching between the shake correction mode A and the shake correction mode B. Here, for example, the shake correction mode A is a mode for performing rough control in the case of correcting the shake of the finder image after the shooting preparation start operation, while the shake correction mode B is for the case of correcting the shake during actual exposure. This is a mode for precise control.

The distance encoder 15 is an encoder for detecting the focus position and converting it into an electric signal, and its output is similarly the microcomputer 3 for image stabilization control, the microcomputer 16 for ultrasonic motor and the microcomputer for communication. It is connected to the computer 24.

Microcomputer 16 for ultrasonic motor
Is for controlling the ultrasonic motor 19 for driving the focusing optical system drive section. The USM encoder 17 is an encoder that detects the amount of movement of the ultrasonic motor 19, and its output is connected to the USM encoder IC 18. USM
The encoder IC 18 is a circuit that converts the movement amount of the ultrasonic motor 19 into an electric signal, and the signal is sent to the ultrasonic motor microcomputer 16.

The ultrasonic motor 19 is a motor for driving the focusing optical system. The ultrasonic motor drive circuit 20 is a circuit which has a drive frequency specific to the ultrasonic motor 19 and generates two drive signals having a 90 ° phase difference from each other. The ultrasonic motor IC 21 is a circuit that interfaces between the ultrasonic motor microcomputer 16 and the ultrasonic motor drive circuit 20.

The zoom encoder 22 is an encoder for detecting the lens focal length position and converting it into an electric signal.
The output is connected to the image stabilization control microcomputer 3, the ultrasonic motor microcomputer 16 and the communication microcomputer 24.

The DC-DC converter 23 is a circuit that supplies a stable DC voltage against fluctuations in the battery voltage.
It is controlled by a signal from the communication microcomputer 24.

The communication microcomputer 24 communicates between the lens apparatus 1 and the body apparatus 2 and is another microcomputer in the lens apparatus 1 which is a vibration control microcomputer 3 or an ultrasonic motor microcomputer. The command is transmitted to 16 or the like.

The release switch 28 is provided in the body device 2, and is a half-press switch SW1 for starting the photographing preparation operation by half-pressing the release button and a full-press switch SW2 for instructing to start the exposure control by fully pressing the release button. Composed of and.

The image pickup apparatus in this embodiment is constructed as described above. FIG. 3 is a flow chart for explaining the operation sequence of the image pickup apparatus including the shake correction mechanism according to the present invention.

Step (hereinafter abbreviated as "S") 2
At 00, the communication microcomputer 24 prepares for communication. At the same time, the image stabilization control microcomputer 3 prepares for communication in S201, and the ultrasonic motor microcomputer 16 prepares for communication in S202.

At S 203, the communication microcomputer 24 communicates with the body device 2 via the lens contact 4. In step S204, the focusing control instruction received from the body device 2 is transmitted to the ultrasonic motor microcomputer 16.

In step S205, the ultrasonic motor microcomputer 16 performs focusing control based on the information from the zoom encoder 22 and the distance encoder 15. In S206, the image stabilization control instruction received from the body device 2 is transmitted to the image stabilization control microcomputer 3.

In step S207, the image stabilization control microcomputer 3 performs the image stabilization calculation. In S208, the image stabilization control microcomputer 3 performs image stabilization control. FIG. 4 shows an example of the shake sensor output waveform detected by the image stabilization head amplifier 13 in FIG. 1 and the timing of the detection prohibition flag calculated based on the image stabilization control instruction transmitted from the body device 2 to the lens device 1. It is a figure showing an example and.

In the shake sensor output waveform shown in FIG. 4, the vibration waveform caused by the operation of the body device 2 or electrical noise appears as sharp vibration waves at points A, B, C and D. The detection prohibition flag is output at the points A, B, C and D, and the drive of the shake correction mechanism is interrupted.

In the present embodiment, the time length is also set in the detection prohibition flag at the same time, and points A, B, C and D are set.
The length of the control interruption time is determined according to the temporal length of the vibration waveform at the point. It should be noted that it is desirable that the interruption time of the shake correction mechanism be made as short as possible in order to ensure smoothness upon restarting after the interruption.

FIG. 5 is a flow chart for explaining the image stabilization calculation subroutine in S207 shown in FIG. In S300 of FIG. 5, the image stabilization control microcomputer 3 reads the shake sensor output output from the image stabilization head amplifier 13.

In S301, the image stabilization control microcomputer 3 determines the logic of the detection prohibition flag transferred from the body microcomputer 25 via the communication microcomputer 24 and the lens contact 4.
That is, when the detection prohibition flag is 1, S303
If the detection prohibition flag is 0, the process proceeds to S302.

In S302, the X motor driver 8
And the sensor output value used for the control duty calculation output to the Y motor driver 12 is replaced with the shake sensor output value obtained in S300.

In S303, the X motor driver 8
Also, the sensor output value used for the control duty calculation output to the Y motor driver 12 remains the sensor output value used for the immediately preceding calculation.

In S304, the position of the shake correction mechanism is detected from the integrated value of the pulses output from the X encoder IC6 and the Y encoder IC10. In S305, the speed of the shake correction mechanism is detected from the amount of change in the pulse output from the X encoder IC6 and the Y encoder IC10.

In step S306, the acceleration of the shake correction mechanism is detected from the difference between the pulse change amounts output from the X encoder IC6 and the Y encoder IC10. S307
At, the target drive speed is calculated from the calculated sensor output value.

In S308, a correction speed amount is calculated from the position of the shake correcting mechanism obtained in S304, the moving speed of the shake correcting mechanism obtained in S305, and the moving acceleration of the shake correcting mechanism obtained in S306.

In S309, the control duty to be output to the X motor driver 8 and the Y motor driver 12 is determined from the target speed obtained in S307 and the correction speed obtained in S308.

As described above, the image stabilization calculation is performed in step S207 shown in FIG. 3, and the image stabilization control is performed based on the result of this calculation, so that it is possible to perform highly accurate shake correction with respect to camera shake.

In this way, in this embodiment, the control prohibiting signal of the shake correcting mechanism is transmitted from the body device to the lens device, and the transmitted lens device controls the speed of the built-in shake correcting mechanism. Discontinue at the same timing as the shake caused by the device. Therefore, in the control of the shake correction mechanism, the shake correction control is not performed when the shake including a cause other than the shake occurs.

(Modifications) The present invention is not limited to the embodiments described above in detail, and various modifications and changes are possible, which are also included in the present invention.

For example, in the above-described embodiments, the lens device and the body device are described as an example of the lens device of a single-lens reflex camera which is detachable, but the lens of the compact camera in which the lens device and the body device are integrated. It can also be applied to departments.

Further, in the present embodiment, both the image stabilization control microcomputer 3 and the ultrasonic motor microcomputer 16 are provided on the lens device 1 side, but the body device 2
It may be provided on the side. However, it is advantageous to provide the lens apparatus 1 on the side of the lens apparatus 1 from the viewpoint of performing optimal control of the shake correction mechanism that varies depending on the size of the lens apparatus 1. Further, in the present embodiment, the speed control of the shake correction mechanism is performed, but the acceleration, the displacement amount, or a combination of these may be used in addition to the speed.

[0055]

As described above in detail, according to the first aspect of the invention, in the image pickup apparatus having the shake correction mechanism, when the shake of the shake caused by the image pickup apparatus occurs, the control of the shake correction mechanism is interrupted. Since it has a control device,
The shake correction mechanism can perform high-precision shake correction.

According to a second aspect of the present invention, in the first aspect of the invention, the control device suspends the control for a time corresponding to the shake occurrence time, so that the shake correction can be performed with high accuracy even if the timing when the shake occurs is different. Control can be performed.

The invention of claim 3 is the same as claim 1 or claim 2.
In the invention described above, when the control of the shake correction mechanism is interrupted, the shake correction mechanism moves at the moving speed immediately before the start of the interruption, so that the shake correction control can be performed without discontinuity of the movement of the shake correction mechanism. .

According to the invention of claim 4, the lens device having the shake correction mechanism includes the control device for interrupting the control of the shake correction mechanism when the shake occurs due to the body device combined with the shake correction. The mechanism can perform highly accurate shake correction.

According to a fifth aspect of the present invention, in the invention of the fourth aspect, the control device suspends the control for a time corresponding to the shake occurrence time. Therefore, the shake correction can be performed with high accuracy even if the timing when the shake occurs is different. Control can be performed.

The invention of claim 6 is the invention of claim 4 or claim 5.
In the lens device equipped with the shake correction mechanism, when the control of the shake correction mechanism is interrupted, the shake correction mechanism moves at the moving speed immediately before the start of the interruption, so the shake correction mechanism does not move discontinuously and shake correction is performed. Control can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an image pickup apparatus including a shake correction mechanism according to the present invention.

FIG. 2 is a configuration diagram schematically showing an image pickup optical system of an image pickup apparatus including a shake correction mechanism according to the present invention.

FIG. 3 is a flowchart illustrating an operation sequence of an image capturing apparatus including a shake correction mechanism according to the present invention.

FIG. 4 is a diagram showing a shake sensor output waveform in an image pickup apparatus including a shake correction mechanism according to the present invention, and a timing of a detection prohibition flag transmitted from the body device to the lens device.

FIG. 5 is a flowchart illustrating an image stabilization calculation subroutine in S207 of FIG.

[Explanation of symbols]

1: Lens Device 2: Body Device 3: Anti-Vibration Control Microcomputer 4: Lens Contact 5: X Encoder 6: X Encoder IC 7: X Axis Drive Motor 8: X Axis Motor Driver 9: Y Encoder 10: Y Encoder IC 11: Y-axis drive motor 12: Y motor driver 13: Anti-vibration head amplifier (angular velocity sensor) 14: VR
Switch 15: Distance encoder 16: Microcomputer for ultrasonic motor 17: USM encoder 18: US
M encoder IC 19: Ultrasonic motor 20: Ultrasonic motor drive circuit 21: Ultrasonic motor IC 22: Zoom encoder 23: DC-DC converter 24: Communication microcomputer 25: Body microcomputer 26: Subject finder 27: Shake correction display unit 28: Release switch

Claims (6)

[Claims] 1. An image pickup apparatus comprising a shake correction mechanism for correcting the shake by performing control for changing an optical axis of a shake correction optical system including a part or the whole of the photographing optical system based on the detected shake. An image pickup apparatus having a shake correction mechanism, comprising: a controller that interrupts the control of the shake correction mechanism when a shake of the shake caused by the image pickup apparatus occurs. 2. An image pickup apparatus including the shake correction mechanism according to claim 1, wherein the control device suspends the control for a time corresponding to a time when the shake occurs. An imaging device equipped. 3. The image pickup apparatus having the shake correction mechanism according to claim 1, wherein the shake correction mechanism moves at a moving speed immediately before the start of the stop when the control is stopped. An image capturing apparatus having a shake correction mechanism. 4. A lens device comprising a shake correction mechanism for correcting the shake by performing control for changing an optical axis of a shake correction optical system including a part or the whole of a photographing optical system based on the detected shake. A lens apparatus having a shake correction mechanism, comprising: a controller for interrupting the control of the shake correction mechanism when a shake of the shake caused by the imaging device occurs. 5. A lens apparatus including the shake correction mechanism according to claim 4, wherein the control device suspends the control for a time corresponding to a time of occurrence of the shake. A lens device provided. 6. A lens apparatus including the shake correction mechanism according to claim 4 or 5, wherein when the control is interrupted, the shake correction mechanism moves at a moving speed immediately before the start of the interrupt. A lens device having a shake correction mechanism.