JPH0968734A - Shake correction mechanism, camera, lens device and body device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a shake correction mechanism from stopping in the state that is away from an optical center position where demonstrates the best photographing optical performance by inhibiting power source stoppage until the shake correction mechanism finishes the control of movement. SOLUTION: The shake correction mechanism shifts a part of a photographing optical system based on the detected value of shake quantity. A lens device 1 is provided with a microcomputer 3 for vibration-proof control, a microcomputer 16 for an ultrasonic motor, a microcomputer 24 for communication or the like, and a body device 2 is provided with a microcomputer 25 for a body or the like, and a control device is constituted by combining the respective microcomputers. Whether power is supplied to a fixed magnet or not is used for judging whether the shake correction mechanism is in a returning state or completes returning. In the case of judging that is in the midst of returning while supplying the power, the turning-off of the power source is inhibited, and in the case of judging that is the completion of the returning while not supplying the power, the power source is turned off. When the shake correction mechanism is controlled to be at a center position, the turning-off of the power source is inhibited until the completion of centering.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shake correction mechanism having a shake correction function, a camera, a lens device and a body device.

[0002]

2. Description of the Related Art Conventionally, an AF mechanism has been generally used in a photographing apparatus represented by a camera, and it has been proposed to add a shake correction mechanism for correcting camera shake.

This blur correction mechanism is incorporated in a photographing device and detects angular fluctuation of the optical axis due to camera shake or the like, and corrects a photographed image by this, for example, Japanese Patent Laid-Open No. 2-6.
No. 6535 applied to a single-lens optical system, on the other hand, in Japanese Laid-Open Patent Publication No. 2-183217, a photographed image is corrected by shifting a part of a photographing optical system of an internal focusing type telephoto lens. Examples are known.

The drive power source of the shake correction mechanism incorporated in these photographing devices is usually a body device power switch (main power switch) provided in the body device to which the lens device incorporating the shake correction mechanism is mounted. On-
Off was being done.

[0005]

By the way, in a conventional photographing apparatus having a shake correction mechanism, for example, when the body apparatus power switch is turned off by the photographing apparatus user, not only the body apparatus but also the lens apparatus and the lens apparatus are used. The drive power source of the shake correction mechanism built into the power supply is immediately shut off.

Therefore, when the drive power source is cut off, if the shake correction control section is moving the shake correction optical system toward the predetermined stop position which is the optical center position, the shake correction mechanism is Since it exists at a position deviated from the center position which is a predetermined stop position, the photographing optical system stops at the position deviated from the center position.

That is, in the conventional image pickup apparatus having the shake correction mechanism, since the power supply control unit provided in the body device does not consider whether or not the drive power supply of the shake correction mechanism may be cut off, Even when the shake correction optical system fixation release magnet (the lock mechanism that releases the fixation of the shake correction mechanism when it is energized and locks it when it is not energized) when the shooting optical system is movable, for example, the power supply When it became necessary to cut off the power supply, such as a drop in the voltage or the power switch of the body device was turned off, the drive power supply for the shake correction mechanism was immediately cut off.

At this time, the lens device is replaceable with respect to the body device, and the lens device in which the photographing optical system is displaced from the center position is removed from the body device and replaced with another body device which does not correspond to the shake correction mechanism. When the camera is mounted and the image is taken, the image taking optical system is taken in a state of being displaced from the center position, which causes a problem that the best image taking optical performance cannot be obtained.

[0009]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a power source control instruction unit when the shake correction mechanism is performing movement control toward the optical center position, that is, when performing centering. When the power-down instruction is received from the camera, the power-off is prohibited until the shake correction mechanism finishes the movement control, so that the shake-correction mechanism is far from the optical center position where the best shooting optical performance can be achieved. It will prevent you from stopping at.

According to a first aspect of the present invention, there is provided a shake correction mechanism for relatively moving all or part of the photographing optical system and a photographing screen based on a detected value of a blur amount of an optical axis in the photographing optical system. It is characterized by comprising a control device that does not shut off the drive power source when the shake correction mechanism is in a state of returning to a predetermined state even if a signal for shutting off the drive power source of the blur correction mechanism is input.

According to a second aspect of the present invention, there is provided a camera having a blur correction mechanism for relatively moving all or part of the photographing optical system and a photographing screen based on a detected value of a blur amount of the optical axis in the photographing optical system. In the above, a control device is provided that does not shut off the drive power source when the shake correction mechanism is in a state of returning to a predetermined state even if a signal for shutting off the drive power source of the blur correction mechanism is input. And

According to a third aspect of the present invention, a lens is provided with a shake correction mechanism that relatively moves all or part of the photographing optical system and a photographing screen based on a detected value of a blur amount of the optical axis in the photographing optical system. In the device, even when a cutoff signal of the main power source provided in the lens device and / or the body device is input from the lens device or a body device connected to the lens device, the shake correction mechanism is provided with a predetermined value. It is characterized by comprising a control device that does not shut off the driving power source of the shake correction mechanism at the time of returning to the state.

According to a fourth aspect of the present invention, there is provided a lens having a shake correction mechanism for relatively moving all or part of the photographing optical system and a photographing screen based on a detected value of a blur amount of the optical axis in the photographing optical system. In a body device used in combination with a device, even if the body device or the lens device outputs a cut-off signal of a main power source provided in the body device and / or the lens device, the shake correction mechanism has a predetermined value. It is characterized by comprising a control device that does not shut off the driving power source of the shake correction mechanism at the time of returning to the state.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, the present invention will be described in more detail by way of an embodiment of the present invention with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of a camera provided with a shake correction mechanism according to the present invention, and FIG. 3 is a schematic diagram showing the configuration of a camera provided with a shake correction mechanism in this embodiment. is there.

This blur correction mechanism is incorporated in a photographing device (see FIG. 3) composed of the lens device 1 and the body device 2, and as will be described later, the amount of blur of the optical axis in the photographing optical system. A part of the photographing optical system is shifted based on the detected value of. The lens apparatus 1 is provided with a vibration control microcomputer 3, an ultrasonic motor microcomputer 16, a communication microcomputer 24 and the like, while the body apparatus 2 is provided with a body microcomputer 25 and the like. In the present embodiment, the control device in the present invention is configured by combining these respective microcomputers.

The image stabilization control microcomputer 3 is based on the output of the body microcomputer 25 of the body device 2 and the optical system position information from the X encoder 5, Y encoder 9, distance encoder 15, zoom encoder 22 and the like. , X-axis drive motor 7, X-axis motor driver 8, Y-axis drive motor 11 and Y-axis motor driver 12
It controls the drive of the shake correction drive unit composed of the above.

The lens contact 4 is a group of electrical contacts used for exchanging signals between the lens device 1 and the body device 2, and is connected to the communication microcomputer 24. The X encoder 5 is for detecting the amount of movement of the optical system in the X-axis direction, and its output is connected to the X encoder IC 6. The X encoder IC 6 is for converting the 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. further,
The X-axis drive motor 7 is a drive motor that moves and drives the X-axis shake correction optical system, and the X-axis motor driver 8 is a circuit that drives the X-axis drive motor 7.

Similarly, the Y encoder 9 is for detecting 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 is for converting 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. Further, the Y-axis drive motor 11 is a drive motor for moving and driving the Y-axis shake correction optical system, and the Y-axis motor driver 12 is a circuit for driving the Y-axis drive motor 11.

The image stabilization head amplifier 13 is a circuit for detecting the amount of blur, converts the image blur information into an electrical signal, and the signal is sent to the image stabilization control microcomputer 3. As the vibration isolation head amplifier 13, for example, an angular velocity 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 1 and the shake correction mode 2. Here, for example, the blur correction mode 1 is a mode for performing rough control when correcting the blur of the finder image after the shooting preparation start operation,
The blur correction mode 2 is a mode in which precise control is performed when blur is corrected during actual exposure.

The distance encoder 15 is an encoder for detecting a 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 that drives the focusing optical system drive unit. The USM encoder 17 is
It 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. The USM encoder IC 18 is a circuit that converts the movement amount of the ultrasonic motor 19 into an electric signal, and the signal is
It is sent to the microcomputer 16 for the ultrasonic motor.

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, and its output is sent to the image stabilization control microcomputer 3, the ultrasonic motor microcomputer 16 and the communication microcomputer 24. Connected.

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 carries out communication between the lens apparatus 1 and the body apparatus 2 and other microcomputers in the lens apparatus 1 (vibration control microphone / computer 3 and ultrasonic motor microcomputer). 16) to transmit the command.

The body microcomputer 25 uses the information on the maximum image stabilization time transmitted from the lens device 1, the exposure setting information, the subject brightness information, etc.
7 is instructed to display a warning.

The release switch 28 is provided in the body device 2. When the user of the photographing apparatus transmits the start of exposure control to the body device and is designated by the image stabilization control start switch determination processing, the shake correction control is performed. Determine the signal transmission timing. Half-press switch SW1 that starts shooting preparation operation by half-pressing the release button by the user of the imaging device
And a full-press switch SW2 for instructing the start of exposure control by full-pressing the release button.

Further, the fixed magnet 29, which is the lock mechanism in the present invention, is provided in the lens device 1, and is an electromagnetic magnet which is interlocked with a mechanical component (not shown) provided for releasing the fixation of the shake correction mechanism. The blur correction mechanism is movable when the electromagnetic magnet is energized, and the blur correction mechanism is fixed when the electromagnetic magnet is not energized. In other words, the fixed magnet 29 is a lock mechanism having an energization type unlocking function that releases the fixation of the shake correction mechanism to a predetermined stop position (center position) when energized.

The camera provided with the blur correction mechanism in this embodiment is configured as described above. FIG. 2 is a flowchart illustrating the operation sequence of the image capturing apparatus according to this embodiment.

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.

In step S203, 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 S207, the image stabilization microcomputer 3 performs image stabilization calculation. In S208, the image stabilization microcomputer 3 performs image stabilization control. FIG. 4 is a diagram illustrating in detail the operation sequence of the communication subroutine S203 of the body device of FIG. Hereinafter, the operation sequence of the communication subroutine S203 will be described with reference to FIG.

In S400, the communication microcomputer 24 determines whether the command received from the body microcomputer 25 is a power control command. If it is not a power control command, the process returns. If it is a power supply control command, the process proceeds to S401.

In step S401, it is determined whether the power control command received from the body microcomputer 25 is a power on instruction. If it is a power-on instruction, S40
Proceed to 2. If it is not the power-on instruction, the process proceeds to S403.

In S402, the communication microcomputer 24 turns on the DC-DC converter 23 and returns. In S403, it is determined whether or not the image stabilization control microcomputer 3 is executing centering.
If centering is being executed, the process returns. If centering is not being executed, the process proceeds to S404.

In S404, the communication microcomputer 24 turns off the DC-DC converter 23.

FIG. 5 shows a communication microcomputer 24.
FIG. 8 is a diagram illustrating an operation sequence of processing executed when the power control command transmitted from the body device 2 in S401 is received.

In S500, it is determined whether or not the communication microcomputer 24 is energizing the fixed magnet 29. If it is energized, the process proceeds to S501, and if it is not energized, the process proceeds to S502.

In step S501, the communication microcomputer 24 sends a power-off prohibition signal to the body microcomputer 25. In S502, the communication microcomputer 24 transmits a power cutoff permission signal to the body microcomputer 25.

As shown in FIG. 5, in the present embodiment, whether or not the fixed magnet 29 is being energized is used to determine whether the shake correction mechanism is in the returning state or the completion of the returning. Shuts off the power when it is in the process of returning, and shuts down the power when it is not energized.

As described above, in the camera of this embodiment, the blurring correction optical system is controlled to move to the optical center position, that is, the blurring correction mechanism is centered toward a predetermined position (center position). Even if the correction mechanism receives an instruction to stop the driving power supply from the power supply control instruction unit, the power shutoff is prohibited until the centering of the shake correction mechanism is completed,
After the centering of the shake correction mechanism is completed, the drive power supply of the shake correction mechanism (power of all or part of the shake detection unit, the shake correction drive unit, and the shake correction control unit) is shut off.

Therefore, the shake correction mechanism is always centered when the drive power is cut off, and the stop of the shake correction optical system in the state of being separated from the optical center position is eliminated.

Therefore, even when the lens device is detached from the body device and mounted on a body device for which shake compensation control is impossible, the shake compensation optical system does not stop in a state away from the optical center position. The best shooting optical performance can be obtained.

(Modifications) The present invention is not limited to the first embodiment described above, and various modifications and changes are possible, and these are also included in the present invention. For example, the case where the shake correction mechanism according to the present invention is applied to the lens device of a single-lens reflex camera in which the lens device and the body device are detachable has been described as an example. Can be applied in exactly the same way.

Further, in the first embodiment, the case where the drive power of the shake correction mechanism is cut off by the body device power switch (not shown) provided in the body device 2 is taken as an example, but the present invention is only in this mode. It is not limited. For example, the drive power of the shake correction mechanism may be cut off by another switch (for example, the VR switch 14) provided in the lens apparatus 1.

Further, in the first embodiment, the case where the installation position of the drive power source of the shake correction mechanism is in the body device 2 is taken as an example, but the present invention is not limited to such an aspect. For example, the case where the installation position of the drive power source of the entire camera including the shake correction mechanism is in the lens device 1 and the case where the drive device is divided into the lens device 1 and the body device 2 are also included.

The relationship between each of the claims and the difference in the installation position of the cutoff switch of the drive power source of the shake correction mechanism and the difference in the installation position of the drive power source is as follows.
And / or if provided in the body device 2, and
The ON / OFF signal of the driving power source can be classified depending on whether it is output from the body device 2 or the lens device 1, and is summarized in Table 1.

[0051]

[Table 1]

In the first embodiment, the blur correction mechanism by moving a part of the photographing optical system two-dimensionally in the plane orthogonal to the optical axis is taken as an example. However, the present invention is not limited to this mode, and is equally applicable to other shake correction mechanisms by rotating or changing the angle of the liquid prism.

Furthermore, in the first embodiment, the presence or absence of energization to the fixed magnet 29 is used to determine whether the shake correction mechanism is in the return state or the return completion, but the present invention is limited to such an aspect. Not something. As another example, it is also possible to use a sensor such as a proximity switch to detect that a part of the shake correction mechanism is positioned at a predetermined position where the optical axes coincide with each other.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a camera including a shake correction mechanism according to the present invention.

FIG. 2 is a flowchart illustrating an operation sequence of the image capturing apparatus according to the first embodiment.

FIG. 3 is an explanatory diagram schematically showing a configuration of a camera including a shake correction mechanism according to the first embodiment.

FIG. 4 is a communication subroutine S203 in the body device.
FIG. 3 is a diagram illustrating in detail the operation sequence of FIG.

FIG. 5 is a diagram illustrating an operation sequence of processing executed when the communication microcomputer receives a power supply control command transmitted from the body device 2 in S401.

[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 USM encoder IC 19 Ultrasonic motor 20 Ultrasonic motor drive circuit 21 Ultrasonic motor IC 22 Zoom encoder 23 DC- DC converter 24 Microcomputer for communication 25 Microcomputer for body 27 Shake correction display section 28 Release switch 29 Fixed magnet (releases the shake correction mechanism to a predetermined state. Lock mechanism with energization type unlocking function)

Claims (4)

[Claims] 1. A blur correction mechanism for relatively moving all or part of the photographing optical system and a photographing screen based on a detected value of a blur amount of an optical axis in the photographing optical system, wherein the blur correction mechanism is driven. A shake correction mechanism comprising a control device that does not cut off the drive power supply when the shake correction mechanism is in a state of returning to a predetermined state even when a power cutoff signal is input. 2. A camera having a blur correction mechanism for relatively moving all or part of the photographing optical system and a photographing screen based on a detected value of a blur amount of an optical axis in the photographing optical system, Even if a signal for cutting off the drive power of the mechanism is inputted, the blur correction mechanism is provided with a control device that does not cut off the drive power when the blur correction mechanism is in a state of returning to a predetermined state. Camera equipped with. 3. A lens device comprising a blur correction mechanism for relatively moving all or part of the photographing optical system and a photographing screen based on a detected value of a blur amount of an optical axis in the photographing optical system, wherein the lens A state in which the shake correction mechanism returns to a predetermined state even when a cutoff signal of a main power source provided in the lens device and / or the body device is input from the device or a body device connected to the lens device. A lens device having a shake correction mechanism, characterized in that the control device does not shut off the drive power source of the shake correction mechanism at a certain time. 4. A lens device provided with a blur correction mechanism for relatively moving all or part of the photographing optical system and a photographing screen based on a detected value of a blur amount of an optical axis in the photographing optical system. In the body device used, the blur correction mechanism returns to a predetermined state even when the body device or the lens device outputs a cutoff signal of a main power source provided in the body device and / or the lens device. A body device comprising a control device that does not shut off the drive power source of the shake correction mechanism at a certain time.