JP2001215544A - Blur correction device, camera body and interchanegeable lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blur correction device which is capable of reducing electric power consumption and deviations, a camera body and an interchangeable lens. SOLUTION: When a release SW turns on, a blur correction optical system starts driving. A timer starts measuring a lapse time t from the drive start time t=0. A shutter opens, and exposure is started according to the 'ON' action of the release SW. The blur correction optical system corrects the blur with high accuracy, at the exposure start and during the exposure. When the lapse time t attains the maximum time Tconst, at which the blur correction is possible, the blur correction optical system is held in the drive position, when this maximum time Tconst elapses. The blur correction optical system is held at the drive position until the exposure second time Tsh is attained, and thereafter, this system is locked. The electric power consumption, when the exposure time Tsh is long, is therefore reduced, and the accumulation of the errors of the blur correction is lessened, and satisfactory photographs can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shake correction device for correcting camera shake caused by camera shake in a camera or the like, a camera body, and an interchangeable lens.

[0002]

2. Description of the Related Art Conventionally, as a blur correction device of this type, a part of a photographing lens (hereinafter referred to as a blur correction device) has been used to correct blur caused by camera shake due to camera shake of a photographer during photographing. There is known a system in which the imaging optical axis is changed by moving (shifting) the entire lens in a plane orthogonal to the imaging optical axis to change the imaging optical axis, thereby correcting the image plane blur.

[0003] Shake correction includes a shake detection unit for detecting camera shake due to hand shake and the like, a shake correction optical system movable in a plane perpendicular to the photographing optical axis with respect to the lens barrel, and a lens mirror. A position detection unit that detects the relative position of the shake correction optical system with respect to the cylinder, and a feedback from the output from the position detection unit that corrects the output from the shake detection unit to change the optical axis required for shake correction. This is performed by an apparatus including a calculation unit for obtaining the correction amount, and a drive unit for driving the blur correction optical system according to the correction amount. These days,
The drive unit that drives the blur correction optical system is mainly a VCM (Voice Coil Motor) that consumes relatively little current,
It is changing for C motors and the like.

[0004]

The exposure time in one photographing operation with a camera or the like greatly differs depending on the use of the photographer or the like. In reality, in today's cameras, one-thousandth
It is possible to set the exposure time from a high speed of seconds to a long time of several hours. In such shooting,
When the exposure time is long, the photographer usually fixes the camera using a tripod or the like in many cases. The photographing with a very long exposure time is, for example, when photographing the axial path of a star in the night sky. At the time of such photographing, the photographer himself removes unnecessary blurring by fixing the camera as described above. Therefore, in such a situation, blur correction during exposure is less necessary and does not make much sense.

[0005] In the shake correction device, the maximum value of the shake correction possible time is not actually infinite but determined by the performance of the shake correction device. If the exposure correction time of the camera is longer than this, if the blur correction control is continued, an error will accumulate during the long control, and the accuracy of the blur correction will be extremely poor or the blur correction control will not be performed. The inconvenience that it becomes possible occurs.

[0006] Further, the need for blur correction is low under shooting with long exposure time as described above,
If the blur correction device cannot recognize the situation that "shake hardly occurs" or that "the exposure time is very long", the blur correction device is unnecessary. The shake correction control must be continued.
This also causes an error to be accumulated and makes accurate blur correction control impossible.

Next, an actuator for performing shake correction control will be described. As described in the related art, recently, the drive unit of the blur correction optical system often uses the VCM. In the case of a normal motor used in combination with a gear or the like when stopping the control of a driving actuator, if the control is stopped, the control target (here, the blur correction optical system) stops at that position. , VCM
In the case of, when the control is stopped, the controlled object falls down in the direction of gravity due to its mechanism.

Therefore, as described above, even if it is not desired to continue the shake correction control during long-time shooting, the VC
We cannot stop M control immediately. If the blur correction control is stopped, the blur correction optical system falls in the direction of gravity. The impact sound, mechanical shock, etc. caused by this drop may be recognized by the user, and such a sudden movement of the taking lens during exposure assures normal shooting. It could even go away.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a camera shake correction device, a camera body, and an interchangeable lens which consume less power and have high camera shake correction accuracy even in long-time exposure shooting. It is.

[0010]

In order to solve the above-mentioned problems, a first aspect of the present invention provides a shake correcting optical system for correcting a shake, a driving unit for driving the shake correcting optical system, and a driving unit. A control unit for controlling the drive, wherein the control unit controls the drive unit to hold the blur correction optical system at a predetermined position after a predetermined time has elapsed from the start of exposure. It is a correction device.

According to a second aspect of the present invention, in the shake correction apparatus according to the first aspect, the predetermined position is a position of the shake correction optical system when the predetermined time has elapsed. It is.

According to a third aspect of the present invention, there is provided a shake correcting optical system for correcting a shake, a driving unit for driving the shake correcting optical system,
A control unit for driving and controlling the driving unit; and an exposure time setting unit for setting an exposure time, wherein the control unit starts exposure of the blur correction optical system when the exposure time is equal to or longer than a predetermined time. Controlling the drive unit to stop before.

According to a fourth aspect of the present invention, there is provided a blur correcting optical system for correcting a blur, a driving unit for driving the blur correcting optical system,
A lens-side control unit for driving and controlling the driving unit, wherein the lens is configured to hold the shake correction optical system at a predetermined position after a predetermined time has elapsed from the start of exposure in a camera body mountable on an interchangeable lens including the lens. A camera body comprising a body-side control unit for instructing the side control unit.

According to a fifth aspect of the present invention, there is provided a shake correcting optical system for correcting a shake, a driving unit for driving the shake correcting optical system,
In a camera body mountable on an interchangeable lens including a lens-side control unit that drives and controls the driving unit, an exposure time setting unit that sets an exposure time, and when the exposure time is equal to or longer than a predetermined time, A camera-side control unit that instructs the lens-side control unit to stop the shake correction optical system before the start of exposure.

According to a sixth aspect of the present invention, a shake is corrected in an interchangeable lens that can be mounted on a camera body and includes an exposure time setting unit that sets an exposure time, and an information output unit that outputs information on the exposure time. A shake correction optical system, a drive unit that drives the shake correction optical system, and a control unit that drives and controls the drive unit, wherein the control unit is configured to control the shake correction optical system after a predetermined time has elapsed from the start of exposure. An interchangeable lens, wherein the driving unit is controlled so as to hold the system at a predetermined position.

According to a seventh aspect of the present invention, an interchangeable lens mountable on a camera body including an exposure time setting section for setting an exposure time and an information output section for outputting information on the exposure time corrects blur. A blur correction optical system, a drive unit that drives the blur correction optical system, and a control unit that drives and controls the drive unit, wherein the control unit is configured to: An interchangeable lens, wherein the drive unit is controlled so that the blur correction optical system is stopped before the start of exposure.

According to an eighth aspect of the present invention, in an interchangeable lens which can be mounted on a camera body and includes a signal output section for outputting a shake correction start signal, a shake correction optical system for correcting shake and driving of the shake correction optical system. A drive unit, a control unit that controls the drive of the drive unit, a reception unit that receives the blur correction start signal, and a clock unit that measures time from the reception of the blur correction start signal, wherein the control unit includes: An interchangeable lens, wherein the drive unit is controlled so that the blur correction optical system is held at a predetermined position after a time from the reception reaches a predetermined time.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a first embodiment of the present invention will be described in more detail with reference to the drawings. First, a camera incorporating a shake correction device according to the first embodiment of the present invention will be described, and an outline of the shake correction device will be described. FIG. 1 is a block diagram of a camera according to the first embodiment of the present invention.

As shown in FIG. 1, the camera 1 includes a blur detecting unit 10, a blur correcting optical system 11, a lens frame 12, a blur correcting optical system driving unit 13, a position detecting unit 14, a shutter driving unit. 15, an exposure time setting unit 16, a film feeding unit 17, a timer 18, an image plane 19, and a control unit 20.
And a release switch SW1 and the like.

The shake detecting section 10 detects vibration caused by hand shake or the like. The blur detection unit 10 is, for example, an angular velocity sensor that detects an angular velocity generated in the camera 1 and outputs an angular velocity signal (a blur detection signal) corresponding to the detected angular velocity value. The blur detection unit 10 is a sensor for detecting pitching that detects an angular velocity about the X axis, and a sensor for yawing detection that detects an angular velocity about the Y axis is not shown.

The blur correction optical system 11 constitutes at least a part of the photographing optical system, and is an optical system for correcting a blur by changing a photographing optical path. The blur correction optical system 11 is, for example, a single lens or a group of a plurality of lenses driven in a plane orthogonal to the optical axis I (in an XY plane). Anti-shake optical system 1
When the image on the image plane 19 moves due to camera shake or the like, it is driven in a direction perpendicular to the optical axis
Is translated. The blur correction optical system 11 includes the lens frame 1
2 and is fixed by being fitted into the inner peripheral portion thereof. The blur correction optical system 11 includes, for example, a unit (4 Wired Suspension) suspended by a support member such as four wires.
n, 4WS).

The blur correction optical system driving unit 13 is a device that generates a driving force to drive the blur correction optical system 11. The blur correction optical system drive unit 13 is, for example, a VCM that arranges a coil in a magnetic circuit formed by a yoke and a magnet and generates an electromagnetic force according to Fleming's left-hand rule when a drive current flows through the coil. The blur correction optical system driving unit 13 is a VC that drives the blur correction optical system 11 in the Y-axis direction.
M, V that drives the blur correction optical system 11 in the X-axis direction.
Illustration of the CM is omitted.

The position detector 14 is a device that detects the actual position of the shake correction optical system 11 and outputs a current position signal (position detection signal). The position detection unit 14 includes, for example, an infrared light emitting diode (IRED), a slit that moves together with the blur correction optical system 11, and a position detection element (PSD) that detects the position of the center of gravity of the light passing through the slit. I have. The position detection unit 14 is a device that detects the position of the blur correction optical system 11 in the Y-axis direction.
The device for detecting the position in the X-axis direction is not shown.

The shutter driving section 15 is a device for driving the shutter 15a. The shutter driving unit 15 drives the shutter 15a according to the exposure time set by the exposure time setting unit 16. The exposure time setting section 16 sets the exposure time. The exposure time setting unit 16 sets the exposure time by manually operating a shutter dial (not shown) or the like by the photographer. The film feeding unit 17 is a device for winding a film. The timer 18 measures the elapsed time from the start of the shake correction control performed during the exposure. The imaging plane 19 is a plane on which light rays transmitted through the imaging optical system including the shake correction optical system 11 form an image. On the imaging surface 19, a silver halide film is arranged. The release switch SW1 is a switch for starting a series of photographing operations such as an exposure operation.

The control unit 20 includes a blur correction optical system driving unit 13
Is a part that executes the shake correction control and the position holding control by driving the microcomputer, and is configured by a one-chip microcomputer or the like. The controller 20 includes a shake detector 10
The blur optical system driving unit 13, the position detecting unit 14, the shutter driving unit 15, the exposure time setting unit 16, the film feeding unit 17, the timer 18, and the release switch SW1 are connected.

The present invention will be described in detail with reference to FIGS. 2 and 3 together with a series of operations in one photographing operation of the camera. FIG. 2 is a time chart schematically showing the operation timing of the camera, the shake correction control, and the position holding control at the time of one long-time shooting in the first embodiment of the present invention. FIG. 3 is a flowchart illustrating the operation of the shake correction control and the position holding control according to the first embodiment. Here, Tsh (sec): exposure time at the time of photographing set by the user (this photographing is assumed to be set to a long time). Tconst (sec): maximum time t in which the camera can perform shake correction control. : Elapsed time from the start of blur correction to the present Tready: Time from the start of blur correction to the start of exposure.

First, FIG.
(A) At time t1, the release switch SW1 is turned on.
Then, the blur correction control is started at the time t2 in FIG. 2D (S101). Then, at the start time (t2) of the shake correction control, the control unit 20 resets to 0 (sec) in FIG. 2E and starts counting by the timer 18 (S102).

On the other hand, in response to the ON signal of the release switch SW1, the control unit 20 opens the shutter 15a and starts exposure at time t3 in FIG. 2B (S10).
3). Of course, at the start of the exposure, the control unit 20 must perform the blur correction control with high accuracy.

Here, the control unit 20 determines whether or not the exposure time Tsh is longer than a predetermined time (Tconst-Tready) (S104). If the exposure time Tsh is not long (No), S1 is executed.
Jump to 07. In the case of the long time (Yes), it is determined whether the elapsed time t is equal to or less than the maximum time Tconst in which the shake correction can be controlled (S105). Tsh in this embodiment
(Sec) is a long time, and at the time t4 in FIG. 2B, the exposure is still underway even after the lapse of Tconst from the start of the shake correction (here, the processing exits from the determination loop of S105. No.), the control unit 20 does not continue the shake correction control after this point. The control after Tconst (sec) is performed at the time when Tconst (sec) has elapsed.
Position holding control is performed to maintain the relative positional relationship between the lens 1 and the lens barrel (S106).

The holding position is the position of the blur correction optical system 11 after a lapse of Tconst (sec). This is the blur correction optical system 1
Since it is only necessary to hold the position of 1, the control by the shake is not required. That is, during this time, from the viewpoint of the control side, it is not necessary to detect the camera shake with high accuracy, and it is not necessary to correct a large camera shake, so that power can be saved. Also, the maximum time Tconst (se
Since c) and thereafter, it is not necessary to perform the blur correction control, so that the blur correction is not performed due to the estimation error, and a failed photograph can be prevented. Thus, by ending unnecessary blur correction control and starting position holding control, power can be saved, and at the same time, a countermeasure against dropping of the VCM under its own weight is provided.

Then, the control unit 20 waits for the end of the exposure after the elapse of the exposure time set by the user (S107), and FIG.
At time t5 in (b), the shutter 15a is closed, the exposed film is wound up by one frame (S108), and the photographing is completed. In the example of FIG. 2, the blur correction optical system 11 is mechanically locked after the exposure is completed. However, any control may be used as long as there is no influence on the next photographing. There is no need to do this between the end and film winding). In addition, if the blur correction has been accurately performed at the start of the exposure, the blur correction control may be started at any time.

Next, the shake correction control and the position holding control will be described in more detail. FIG. 4 is a block diagram showing a control system of the camera according to the present invention, and FIG.
9 illustrates the shake correction control, and FIG. 9B illustrates the position holding control. In (a), first, the operation unit (g0)
Calculates a signal Px representing a target position under the control of the shake correction optical system to be controlled based on the output of the shake detection unit 10. Then, a signal Pr indicating the actual position of the blur correction optical system detected by the position detection unit 14 is fed back to the target position signal Px, and the target position and the actual position (P
An error ΔP between x and Pr) is obtained.

Next, the arithmetic unit (g1) converts the error ΔP by a predetermined coefficient to convert the error ΔP into a drive signal (Vin) to be controlled. Here, the obtained drive signal (Vi)
n) is input to the control target (the blur correction optical system driving unit 13) to perform control. Here, Px is a signal that changes due to shake, and is a signal obtained by converting a shake signal detected by the shake detection unit 10 so as to correct the shake via the calculation unit (g0). .

On the other hand, the position holding control of FIG. 4B will be described. Here, the target position of the blur correction optical system is P
Set to const. The feedback control of the position of the blur correction optical system is performed in the same manner as in FIG. 4A, but here, the target position Pconst of the blur correction optical system is a constant value, and The control is such that it is maintained at a certain fixed position.

FIG. 5 is a flowchart of the camera position holding control according to the present invention, and FIG. 4B is a flowchart. In step S201, the actual position Pr of the blur correction optical system is detected. In S202, an error ΔP between the target shake correction optical system position Pconst and the actual position Pr detected in S201 is calculated. In S203, the error Δ
From P, the drive amount Vin of the blur correction optical system is calculated. S
At 204, a drive signal (drive amount Vin) is transmitted to the control target. Thereby, the blur correction optical system is driven.
Control is performed by repeating this.

According to the first embodiment, since the shake correction control is stopped after the maximum time Tconst in which the shake correction can be controlled, high-precision shake detection is not required. It is not necessary. Therefore, it is possible to reduce power consumption and prevent a blur correction error from being accumulated, thereby obtaining a good photograph. In addition, after the maximum time Tconst in which the blur correction can be controlled, the blur correction optical system is controlled to be held at the position of the blur correction optical system at the time of Tconst. It has become.

(Second Embodiment) FIG. 6 is a flowchart showing a second embodiment of the present invention. Note that the hardware configuration and the like are the same as those in the first embodiment, and are not shown. The camera according to the second embodiment does not perform the shake correction control during the exposure when the exposure time is a long time.

The controller 20 determines whether the exposure time Tsh is longer than a predetermined time (Tconst-Tready) (S
301) If it is a long time (Yes), the process proceeds to S302, and the blur correction is stopped. If it is not a long time (No), the process proceeds to S303 to start the blur correction control. Then, after performing the exposure (S304, S305), the film is wound up by one frame (S306), and the shooting ends.

According to the second embodiment, if the exposure time is a long time, the blur correction control is not performed from the beginning. Can interfere with photos. Further, compared to the first embodiment, there is an effect that power consumption is further reduced and a timer can be omitted.

(Third Embodiment) FIG. 7 is a block diagram of a single-lens reflex camera according to a third embodiment of the present invention. In the following, the same blocks as the blocks shown in FIG. 1 will be described with corresponding numbers, and detailed description thereof will be omitted. The third embodiment of the present invention is an embodiment in which the shake correction device mounted on the camera according to the first embodiment is applied to a single-lens reflex camera.

As shown in FIG. 7, the camera body 3 includes a shutter driving unit 71, a mirror driving unit 35, an exposure time setting unit 36, a film feeding unit 37, a timer 38, and an image forming surface 39. , A body-side control unit 40, a body-side electrical contact 41, and a release switch SW3.

The shutter driving section 71 is a device for driving the shutter 72. The shutter driving unit 71 drives the shutter 72 according to the exposure time set by the exposure time setting unit 16. The mirror driving unit 35 is a device that drives the mirror 35a. The mirror driving unit 35 includes an imaging surface 39
This is a part that switches the path of the incident light beam to the mirror 35a by moving the mirror 35a up and down. The mirror driving unit 35 drives the mirror 35a to move it up during the exposure to form a path for the incident light on the film surface.

The body-side control section 40 is a one-chip microcomputer that performs various controls on the camera body 3 side. The body-side control unit 40 includes a mirror driving unit 35,
An exposure time setting unit 36, a film feeding unit 37, a timer 38, a body side electrical contact 41, a release switch S
W3 is connected. The body-side controller 40 is electrically connected to the lens-side controller 60 via the body-side electrical contact 41 and the lens-side electrical contact 61, and the lens-side controller 6
0 can exchange information with each other.

The interchangeable lens 5 includes a shake detection section 50, a shake correction optical system 51, a lens frame 52, a shake optical system drive section 53, a position detection section 54, a lens side control section 60, a lens side electric And a contact 61. The interchangeable lens 5
It is detachable from the camera body 3 and can be replaced.

The lens-side control unit 60 includes the body-side control unit 4
0 is a one-chip microcomputer that executes the shake correction control and the position holding control shown in FIG. 2 based on a predetermined command output. The lens-side control unit 60 is connected to a shake detection unit 50, a shake correction optical system drive unit 53, a position detection unit 54, and a lens-side electrical contact 61.

FIG. 8 shows a third embodiment of the present invention.
5 is a time chart schematically showing camera operation timing, shake correction control, and position holding control during one long-time shooting. FIG. 9 is a flowchart illustrating the operation of the shake correction control and the position holding control according to the third embodiment.
In the camera according to the third embodiment, an instruction relating to shake correction control is issued from the camera body 3 to the interchangeable lens 5 using communication means. Actually, the body-side control unit 40 uses the communication means described above to
An instruction regarding blur correction is given to 0. This instruction
As shown in FIG. 8E, a shake correction start command (FIG.
S401), a shake correction stop command (S40 in FIG. 9)
6), and transmitted as a lock command (S408 in FIG. 9) to the lens-side controller 60 by communication.

The details will be described below with reference to FIGS. The description of the same time names and the like as in the first embodiment is omitted. At time t1 in FIG. 8, when the release SW is pressed, the body-side control unit 40 transmits a shake correction control start command to the lens (S401). At the same time, the body-side control unit starts counting the timer from 0 (S402), and measures the elapsed time t from this point. On the other hand, the lens-side control unit 60 starts driving the blur correction optical system driving unit so as to perform blur correction of the blur correction optical system from time t2 immediately after receiving this command via the electrical contact. Also, the body-side control unit 40
At time t3 in FIG. 8C, the shutter is opened to start exposure (S403). The body-side control unit 40 determines whether the exposure time is longer than a predetermined time (Tconst-Tready) (S404). If the exposure time is shorter (NO), it determines that the exposure time is not longer, and jumps to S407. I do.

If not (Yes), the elapsed time t is continuously monitored (S405), and when the time Tconst (sec) elapses (t4 in FIG. 8), the lens-side control unit 60 stops the blur correction control. The command is transmitted (S406). The lens-side control unit 60 receives this command, and executes a processing routine of the position holding control shown in FIG. As a result, the blur correction optical system 51 is held by the blur correction optical system drive unit 53 at the drive position at the time when the command is received (= when Tconst has elapsed). Then, the body-side control unit 40 waits until the elapsed time t reaches the exposure time Tsh, at which time the shutter is closed to end the exposure (S407). At the same time, the body-side control unit 40 transmits a lock command (S408). Upon receiving this, the lens side controller 6
0 is to mechanically lock the blur correction optical system 51,
An instruction is given to a shake correction driving unit and a lock device (not shown). Thereby, the blur correction optical system is mechanically locked at a predetermined position.

Thereafter, the body-side control section 60 drives the film feeding section 37 to wind up the film by one frame (S409), and ends the photographing. The command prompts the lens-side control unit 60 of the interchangeable lens 5 that actually controls the timing to perform shake correction control during long-time exposure shooting. The lens-side control unit 60 performs shake correction control according to this command.

(Fourth Embodiment) FIG. 10 shows a fourth embodiment of the present invention.
5 is a flowchart for explaining the operation of the camera according to the embodiment. Note that the hardware configuration and the like are the same as those of the third embodiment, and are not shown. The fourth embodiment of the present invention differs from the third embodiment in that when the exposure time Tsh is a long time, the lens controller 60 performs the blur correction before the exposure so that the blur control is not performed during the exposure. This is another embodiment in which a command for stopping control is transmitted. First, when the release SW is pressed, the body-side control unit 40
Determines whether the exposure time Tsh is longer than a predetermined time (Tsh-Tready) (S501). If it is longer (Yes), it is determined that the exposure time is long, and the process proceeds to S502. here,
The body-side control unit transmits a blur correction stop command to the lens-side control unit, and the lens-side control unit receives the command and stops the blur correction control of the blur correction optical system 51 before the start of exposure. Controls the correction optical system drive unit. If it is not a long time, the body-side control unit transmits a shake correction start command to the lens-side control unit (S503).

Thereafter, the body-side control section starts exposure (S504), and ends the exposure after the elapse of Tsh (S50).
6), and finally, wind up the film by one frame (S50).
7) Then, the shooting ends. In the fourth embodiment of the present invention, a shake correction stop command is transmitted from the body control unit 40 to the lens control unit 60 in order to stop the shake correction optical system before the start of exposure. As a result, the fourth embodiment of the present invention has the same effect as the second embodiment of the present invention because the shake correction control is not performed from the beginning when the exposure time Tsh is long.

According to the fourth embodiment, even in the case of the interchangeable lens, the blur correction control during the long exposure can be made flexible.

(Fifth Embodiment) FIG. 11 shows a fifth embodiment of the present invention.
FIG. 1 is a block diagram of a single-lens reflex camera according to an embodiment. In the fifth embodiment of the present invention, unlike the third embodiment, the exposure time Tsh is transmitted from the body side control unit 40 to the lens side control unit 20.
Is transmitted before the start of exposure. The interchangeable lens 5 includes a timer 58 illustrated in FIG. 11, and the timer 58 is connected to the lens-side control unit 60.

Next, the operation of the single-lens reflex camera according to the fifth embodiment of the present invention will be described. FIG. 12 shows a fifth embodiment of the present invention.
6 is a flowchart for explaining the operation of the interchangeable lens in the single-lens reflex camera according to the embodiment. In the fifth embodiment, upon receiving a shake correction control start command from the body (S601), the lens-side control unit 60 starts shake correction control of the shake correction optical system 51 (S602). At this time, the exposure time Tsh is received from the body-side control unit as data accompanying the shake correction control start command. As a result, the lens-side controller 60 knows Tsh, and if the exposure time is equal to or longer than a predetermined time (Tconst-Tready),
It is determined that it is a long time (S604: Yes), and Tconst
At the time point (S605), the position holding control is started (S605).
606). Thereafter, this control is continued until an instruction by the next command is transmitted from the body side control unit (S607), and when a lock command is received as the next command (S608), the blur correction optical system is locked. And mechanically locked (S609). Note that the command received in S608 is not limited to the lock command, and if the command is transmitted by the camera body after exposure is completed,
Anything is fine. Further, the transmission of Tsh is not limited to the format of data accompanying the shake correction control start command, and may be transmitted as independent data separately. In this case, it is desirable that the transmission be performed at a timing immediately before receiving the shake correction start command.

In the fifth embodiment of the present invention, the lens-side control unit 60 executes the blur correction control and the position holding control based on the information on the exposure time Tsh transmitted before the start of the exposure by the body-side control unit 40. Therefore, the same effect as in the first embodiment of the present invention is obtained. In addition, even in the case of an interchangeable lens, it is possible to provide flexibility in blur correction control during long-time exposure.

(Sixth Embodiment) FIG. 13 shows a sixth embodiment of the present invention.
6 is a flowchart for explaining the operation of the interchangeable lens in the single-lens reflex camera according to the embodiment. The sixth embodiment of the present invention is an embodiment in which information on the exposure time Tsh is transmitted from the body-side control unit 40 to the lens-side control unit 20 before the start of exposure, as in the fifth embodiment.

In the sixth embodiment, the lens side controller 60
Receives the shake correction control start command (S70
1) When the exposure time Tsh is long (S70)
2: Yes), the blur correction optical system 11 is stopped before the start of exposure (S703), and the blur correction control is not performed from the beginning, so that the same effects as in the second embodiment of the present invention are obtained. When the exposure time Tsh is long, the interchangeable lens 5
Flexibility can be given to the shake correction control.

(Seventh Embodiment) FIG. 14 shows a seventh embodiment of the present invention.
6 is a flowchart illustrating an operation of the interchangeable lens in the single-lens reflex camera according to the embodiment. In addition,
The time name and the hardware configuration are the same as those in the fifth embodiment, so that the illustration is omitted. Body-side control unit 40 of the present embodiment
Has a sequence of performing blur correction while clearing various restrictions such as a problem of power consumption at the same time as exposure control. The body-side control unit 40 follows this sequence,
The shake correction start signal is output via the transmission unit 41.

On the other hand, the interchangeable lens can communicate with the body by the communication means described in the fourth to sixth embodiments, and the lens-side control unit 60 outputs the signal from the signal output unit of the body. By receiving the shake correction start signal via the receiving unit 61, the shake correction is started. In addition, the timer unit 58 starts timing by receiving a shake correction start signal from the body, and when the shake correction operation reaches a predetermined time (Tconst), stops the shake correction regardless of information from the body side, The blur correction optical system 51 is held at a predetermined position.

Hereinafter, the contents described so far will be described as an actual flow with reference to FIG. First, when the release SW is pressed by the user, a shake correction start command is transmitted from the body-side control unit to the lens-side control unit in order to perform shake correction control during exposure (S80).
1). The lens-side control unit receives this and starts blur correction control (S802). However, since the lens-side control unit has no information on the exposure time of this one release, the lens-side control unit has no information. The control unit starts the timer count simultaneously with the start of the shake correction control (S803), and measures the elapsed time t from this point.

The lens-side controller continues to monitor the elapsed time t (S804), and when the elapsed time t exceeds a predetermined value (Tconst) (S804: Yes), the maximum blur correction possible time of this lens has elapsed. Therefore, the control is switched to the position holding control (S806). However, this is only when there is no instruction from the body-side control unit during this period, and when a command relating to driving of the blur correction optical system is received from the body-side control unit before the elapse of Tconst ( In S805: Yes), the control according to the received command is performed without switching the shake correction control to the position holding control.

On the other hand, according to the judgment of the lens-side control unit,
Also in the case where the control is switched to the position holding control, the control waits for an instruction by a command from the next body (S807), and continues the position holding control until then, and after receiving the command, performs control according to the command. This command depends on the sequence related to the release and is transmitted by the judgment of the body side control unit. For example, if the blur correction control is unnecessary after the exposure is completed, the blur correction optical system is mechanically locked. And the like to execute a lock command. The control on the interchangeable lens side in one release is performed in this manner.

According to the present embodiment, even when there is a limit to the continuation time of the blur correction control, the blur correction control can be stopped after the maximum blur correction possible time (Tconst). Further, the maximum time during which the blur correction is possible is determined by the performance of the lens, and varies depending on the type of interchangeable lens equipped with the blur correction function. Therefore, even if an attempt is made to transmit a kind of command to end the blur correction control from the body side to the lens side at the time when the maximum blur correction possible time during long-time shooting has elapsed, the transmission timing differs depending on the attached lens. This is not a good idea. From these facts, it is desirable that the timing at which the maximum time during which the shake can be corrected elapses and the control thereafter are managed on the lens side.

Further, according to the present embodiment, since information relating to the exposure time is not required in the command instruction or transmission data from the body, the exposure time acquisition means is not required. Therefore, not only the configuration is simplified, but also the data communication time between the body and the interchangeable lens is reduced.

(Other Embodiments) The present invention is not limited to the above-described embodiments, and various modifications or changes can be made as described below. Within range. (1) In the embodiment of the present invention, the position holding control is ended at the same time as the end of the exposure, but the position holding control may be continued until a predetermined time after the end of the exposure. Further, in the embodiment of the present invention, it is only necessary to correct the blur correction with high accuracy at the start of exposure, and the blur correction control may be started before the start of exposure. For example, when the release switches SW1 and SW3
It is sufficient that the blur correction control is started between the N operation and the start of the exposure.

(2) In the embodiment of the present invention, the correctable time Tconst is set to several seconds at which no error is accumulated.
The correction possible time Tconst is determined by the lens performance of the shake correction optical system 11 and the mechanical structure of the shake correction device.
It can be set at any time.

(3) The embodiment of the present invention has been described by taking as an example a case in which a camera 1 having an integrated lens, a camera body 3 of a single-lens reflex camera and an interchangeable lens 5 are equipped with a shake correcting device. The present invention can be applied not only to the third embodiment but also to an intermediate adapter and the like. Also, the image plane 19,
Although the case where a silver halide film is installed in 39 has been described as an example, an imaging device (CCD) may be installed.

[0068]

As described above in detail, according to the present invention, after a predetermined time has elapsed from the start of exposure, the blur correction optical system is controlled to be held at a predetermined position. If the set exposure time is equal to or longer than a predetermined time, the blur correction optical system is controlled to stop before the start of exposure, so that power consumption is reduced and accumulation of errors in blur correction is prevented. Good photos can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a camera according to a first embodiment of the present invention.

FIG. 2 is a timing chart schematically showing the operation timing of the camera according to the first embodiment of the present invention, shake correction control, and position holding control.

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

FIG. 4 is a block diagram illustrating a control system of the camera according to the first embodiment of the present invention.

FIG. 5 is a flowchart for explaining a processing routine of position holding control in the camera according to the first embodiment of the present invention.

FIG. 6 is a flowchart illustrating an operation of a camera according to a second embodiment of the present invention.

FIG. 7 is a block diagram of a single-lens reflex camera according to a third embodiment of the present invention.

FIG. 8 is a timing chart of a single-lens reflex camera according to a third embodiment of the present invention.

FIG. 9 is a flowchart illustrating an operation of a camera body in a single-lens reflex camera according to a third embodiment of the present invention.

FIG. 10 is a flowchart illustrating an operation of a camera according to a fourth embodiment of the present invention.

FIG. 11 is a block diagram of a single-lens reflex camera according to a fifth embodiment of the present invention.

FIG. 12 is a flowchart illustrating an operation of an interchangeable lens in a single-lens reflex camera according to a fifth embodiment of the present invention.

FIG. 13 is a flowchart illustrating an operation of an interchangeable lens in a single-lens reflex camera according to a sixth embodiment of the present invention.

FIG. 14 is a flowchart illustrating an operation of an interchangeable lens in a single-lens reflex camera according to a sixth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 camera 3 camera body 5 interchangeable lens 11, 51 blur correction optical system 13, 53 optical system driving unit 16, 36 exposure time setting unit 20 control unit 40 body side control unit 60 lens side control unit Tconst predetermined time Tsh exposure time I light axis

Claims (8)

[Claims] 1. A blur correction optical system that corrects a blur, a drive unit that drives the blur correction optical system, and a control unit that drives and controls the drive unit, wherein the control unit performs a predetermined time from the start of exposure. After
Controlling the drive unit to hold the blur correction optical system at a predetermined position. 2. The blur correction device according to claim 1, wherein the predetermined position is a position of the blur correction optical system when the predetermined time has elapsed. 3. A blur correction optical system for correcting blur, a drive unit for driving the blur correction optical system, a control unit for driving and controlling the drive unit, and an exposure time setting unit for setting an exposure time. And a controller configured to control the drive unit to stop the blur correction optical system before starting the exposure when the exposure time is equal to or longer than a predetermined time. 4. A camera body mountable on an interchangeable lens, comprising: a shake correction optical system for correcting shake, a drive unit for driving the shake correction optical system, and a lens-side control unit for driving and controlling the drive unit. 5. The camera body according to claim 1, further comprising a body-side control unit that instructs the lens-side control unit to hold the shake correction optical system at a predetermined position after a predetermined time has elapsed from the start of exposure. 5. A camera body mountable on an interchangeable lens, comprising: a shake correction optical system for correcting shake, a drive unit for driving the shake correction optical system, and a lens-side control unit for driving and controlling the drive unit. An exposure time setting unit that sets an exposure time; and a body side that instructs the lens side control unit to stop the blur correction optical system before the start of exposure when the exposure time is equal to or longer than a predetermined time. A camera body, comprising: a control unit; 6. An interchangeable lens mountable on a camera body, comprising: an exposure time setting unit that sets an exposure time; and an information output unit that outputs information related to the exposure time. A drive unit that drives the blur correction optical system; and a control unit that drives and controls the drive unit. The control unit, after a predetermined time has elapsed from the start of exposure,
An interchangeable lens, wherein the drive unit is controlled so as to hold the blur correction optical system at a predetermined position. 7. An interchangeable lens mountable on a camera body, comprising: an exposure time setting unit that sets an exposure time; and an information output unit that outputs information on the exposure time. A drive unit that drives the shake correction optical system; and a control unit that drives and controls the drive unit. The control unit controls the shake correction optical system when the exposure time is equal to or longer than a predetermined time. An interchangeable lens, wherein the driving unit is controlled to stop before the start of exposure. 8. An interchangeable lens that can be mounted on a camera body and includes a signal output unit that outputs a shake correction start signal, a shake correction optical system that corrects shake, a drive unit that drives the shake correction optical system, A control unit that drives and controls the driving unit; a receiving unit that receives the shake correction start signal; and a time counting unit that counts time from the reception of the shake correction start signal. After reaching a predetermined time, controlling the driving unit so as to hold the shake correction optical system at a predetermined position.