JPH08262520A - Camera provided with image blur preventing device - Google Patents

Abstract

PURPOSE: To optically correct composition while executing control for preventing an image blur by changing the image blur prevention control, after a focusing completion detecting device detects the completion of focusing. CONSTITUTION: The output of a CPU 3 is connected to motors 5 with a driving circuit 4, which drives the motors 5, based on the control signal of the CPU 3 and a blur preventing lens 10 is moved to prevent the image blur. Two motors 5 are provided to vertically and horizontally drive the blur preventing lens 10 respectively. An image blur control releasing switch 6 is used for releasing image blur control and connected to the CPU 3, to execute the control for preventing the image blur when the switch 6 is turned off. The camera is constituted so as to change the image blur prevention control after the focusing is completed, so that, when the composition is corrected, the correction is made easy. Moreover, in the case of manually focusing, an unnecessary change in image blur prevention can be canceled to reduce the consumption of a battery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera provided with an image blur prevention device, and more particularly to a camera provided with an automatic focusing device.

[0002]

2. Description of the Related Art Conventionally, a camera provided with this type of image blur prevention device detects an image blur by using an acceleration sensor or the like, and a part of a photographing lens (anti-blurring lens) in a direction of canceling the image blur. ) Was moved.

On the other hand, when performing focus adjustment in the focus adjustment area at the center of the screen, the AF camera corrects the composition while maintaining the focus adjustment state (focus lock) after the focus adjustment is completed, and then releases the shutter. Was being done.

[0004]

However, when the camera equipped with the conventional image blur prevention device described above is an AF camera, the camera is intentionally moved in order to correct the composition. , Because the image blur prevention control is performed, the finder image does not move when revising a delicate composition, and the finder image does not move at the beginning when revising a composition significantly, which makes it difficult to correct the composition. There was a problem.

The object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a camera having an image blur prevention device whose composition is easy to correct.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 is a blur detecting device for detecting an image blur, and a blur driving optical system for changing a photographing optical axis to drive a blur preventing optical system. In a camera equipped with an image blur prevention device including an anti-driving device and an anti-shake control device that controls the anti-shake drive device based on the output of the blur detection device, a focus adjustment for performing focus adjustment of a photographing optical system A device and a focus adjustment completion detection device for detecting that focus adjustment of the focus adjustment device is completed, the shake prevention control device, after the focus adjustment completion detection device detects the completion of focus adjustment,
The feature is that the image blur prevention control is changed.

According to a second aspect of the present invention, in the camera provided with the image blur prevention device according to the first aspect, the blur prevention control device sets the focus adjustment completion detection device after detecting the focus adjustment completion. The image blur prevention control is performed by changing or limiting the size of the image blur detected by the blur detection device.

According to a third aspect of the present invention, in the camera provided with the image blur prevention device according to the first aspect, the blur prevention control device sets the focus adjustment completion detection device after detecting the focus adjustment completion. The image blur prevention control is performed by changing or limiting the frequency of the image blur detected by the blur detection device.

According to a fourth aspect of the present invention, in the camera provided with the image blur prevention device according to the first aspect, the blur prevention control device sets the focus adjustment completion detecting device after detecting the focus adjustment completion. An image blur prevention control is performed by changing or limiting the shift amount of the blur prevention drive device.

According to a fifth aspect of the present invention, based on an output of the shake detection device, a shake detection device that detects an image shake, an anti-shake drive device that drives an anti-shake optical system by changing a photographing optical axis. A camera provided with an image blur prevention device including an anti-shake control device for controlling the anti-shake drive device; and an automatic focus adjustment device for automatically adjusting the focus by measuring a distance to a subject. By a manual focus adjustment device for manually performing focus adjustment, and a focus adjustment switching device that switches between the automatic focus adjustment device and the manual focus adjustment device. It is characterized in that the control for image blur prevention is changed according to the focus adjustment method by the device.

According to a sixth aspect of the present invention, in the camera provided with the image blur prevention device according to the fifth aspect, the blur prevention control device performs the image blur prevention control after completion of focus adjustment during automatic focus adjustment. It is characterized by changing.

The invention of claim 7 is claim 5 or claim 6.
In a camera equipped with the image blur prevention device described in
The automatic focus adjustment device has an AF single mode and an AF continuous mode, and the blur prevention control device according to the AF mode of the automatic focus adjustment device,
The feature is that the image blur prevention control is changed.

[0013]

According to the present invention, after the focus adjustment is completed, the image blur prevention control is changed by changing or limiting the size of the image blur, the frequency of the image blur, the shift amount of the blur preventing optical system, and the like. As a result, when the composition is corrected, the movement of the image in the viewfinder is changed or restricted, and the composition is easily corrected. Further, during manual focusing, unnecessary changes in image blur prevention can be canceled, so that battery consumption can be reduced.

[0014]

【Example】

(First Embodiment) The present invention will be described in detail below with reference to the drawings and the like. FIG. 1 is a block diagram showing a first embodiment of a camera provided with an image blur prevention device according to the present invention. The taking lens L is composed of a first lens 8, a focusing lens 9, an anti-shake lens 10 and a diaphragm 7. The angular velocity sensors 1 and 2 are for detecting image blur, and the two sensors 1, 2 are provided.
Detects the vibration in the vertical direction and the vibration in the horizontal direction, and the output thereof is connected to the CPU 3. The CPU 3 is a processing device including a function of obtaining the image blur amount from the focal length of the taking lens L and the taking distance. The focal length is stored in the CPU 3, and the shooting distance can be obtained by detecting the position of the focusing lens 9 by a known method.

The output of the CPU 3 is sent through the drive circuit 4 to
It is connected to the motor 5. The drive circuit 4 is the CPU 3
Based on the control signal, the motor 5 is driven to move the anti-shake lens 10 so as to prevent image blur. Here, although only one motor 5 is shown, two motors 5 are provided to drive the anti-shake lens 10 in the vertical and horizontal directions, respectively. Image blur control release switch 6
Is a switch for canceling the image blur control, and CP
It is connected to U3, and when it is OFF, image blur prevention control is performed, and when it is ON, image blur prevention control is not performed.

The focus adjustment ring 11 is an operation portion for moving the focusing lens 9 in the optical axis direction by operating the focus adjustment ring 11 to manually perform focus adjustment. The focus adjustment switching mechanism 12 is a mechanism that switches between automatic focus adjustment and manual focus adjustment. Focus adjustment switch 13
Is a switch interlocking with the focus adjustment switching mechanism 12, which is turned on during automatic focus adjustment and O during manual focus adjustment.
FF.

The CPU 25 is a processing device for performing various controls of the camera, and includes a photometry circuit 22, a distance measurement circuit 23, a DX reading circuit 24, a shutter control circuit 26, and an aperture control circuit 2.
7, focusing control circuit 28, display control circuit 3
0, half-push switch 20, full-push switch 21, AF mode switch 31, etc. are connected.

The photometric circuit 22 is a circuit for measuring the brightness of the subject. The distance measuring circuit 23 is a circuit for measuring the distance to the subject. The DX reading circuit 24 is a circuit for reading the sensitivity of the film. The shutter control circuit 26
A shutter circuit that controls a shutter (not shown). The diaphragm control circuit 27 is a circuit that controls the diaphragm 7. The focusing control circuit 28 is a circuit that controls the driving of the focusing lens 9 by the motor 29 based on the distance measurement result. The display control circuit 30 is, for example, a circuit that displays a shutter speed, an aperture value, and the like by an LCD (not shown) incorporated in the finder.

The half-push switch 20 is a switch which is turned on when a release button (not shown) is half-pushed, and the full-push switch 21 is turned on when a release button (not shown) is fully pressed.
It is a switch to do. AF mode switch 31
AF in single mode and AF continuous mode
It is a switch for switching modes.

2 and 3 are flow charts showing a first embodiment of a camera equipped with the image blur prevention device according to the present invention. CPU 25 turns on a main switch (not shown)
Then, this flow is started, and when the release button is pressed halfway (half-press switch 20 is turned on) (S201),
It is determined whether the image blur control release switch 6 is not operated and is OFF (S202). When the image blur control release switch 6 is off, the photographing mode for preventing the image blur is set, and the detection of the image blur is started (S20).
3) Then, image blur prevention is started (S204).

In step S202, when the image blur control release switch 6 is operated to be ON, the photographing mode in which the image blur prevention control is not performed is performed and the process jumps to step S205.
Then, the CPU 25 reads the sensitivity of the film by the DX reading circuit 24 (S205), measures the brightness of the object by the photometric circuit 22, and determines the TV value and the AV value (S).
206). Further, the display control circuit 30 is instructed to display the shutter speed and the aperture value corresponding to each (S207).

The CPU 25 determines whether or not the switch 13 is ON (S208). If the switch 13 is ON, it means that the focus is adjusted automatically. Therefore, the distance measuring circuit 23 measures the distance to the object. , Focusing control circuit 2
8. The focusing lens 9 is driven via the motor 29 to perform automatic focus adjustment (S209). Then C
The PU 25 determines whether or not the automatic focus adjustment has been completed (S210), and when the automatic focus adjustment has been completed, instructs the display control circuit 30 to display that the automatic focus adjustment has been completed (S211).

When the release button is half pressed (S212), the CPU 25 causes the image blur control release switch 6
Is not operated and it is judged whether it is OFF (S21).
3). When the image blur control release switch 6 is OFF,
As described later in detail, the control method for image blur prevention is changed (S214). When the image blur control release switch 6 is ON, the CPU 25 continues the image blur prevention in a shooting mode or the like for controlling the image blur prevention. That is, if the release button is half-pressed (S215) and the release button is fully pressed (S216), after the change of the image blur control is canceled (S217), the control of the image blur prevention is restarted (S21).
8). This is so that the composition can be adjusted freely until the release button is fully pressed.

On the other hand, in the CPU 25, the switch 13 is OF
In the case of F (S208), since it is manual focus adjustment,
It is determined whether or not the manual focus adjustment is completed (S21
9) If it is completed, the display control device 3 to that effect.
0 is displayed (S220). If the manual focus adjustment has not been completed, the step S22
Go to 1.

The CPU 25 presses the release button halfway (S221), and if the release button is fully pressed (S2).
22), exposure is performed according to the values of TV and AV determined in S206 (S223), and after the control of image blur prevention is completed (S224), processing such as film winding is performed (S225), and a series of shooting operations is completed. To do.

Next, the method of changing the image blur prevention control in S214 will be described in detail. Here, the reason for changing the image blur prevention control is that if the camera is intentionally moved to correct the composition after the focus adjustment is completed, the same image blur prevention control as usual will be performed. First, the finder image does not move when the composition is subtly corrected, and secondly, when the composition is largely corrected, the finder image does not move at the beginning of the correction, and the image blurring prevention has an adverse effect. Because.

FIG. 4 is a circuit block diagram for explaining in detail the angular velocity sensor section of the camera according to the first embodiment.
The output ω of the angular velocity sensors 1a and 2a is the filter 1
After being amplified by the amplifiers 1c and 2c through b and 2b, they are connected to the CPU 25 through the CPU3.

FIG. 5 is a flow chart showing an image blur prevention changing processing subroutine of the camera according to the first embodiment. Since the photographer intentionally moves the camera when the composition is corrected after the focus adjustment is completed, the angular velocity becomes higher than that at the time of the focus adjustment. Therefore, in the first embodiment, the angular velocity used for the image blur prevention control after the focus adjustment is completed is limited to the maximum value (ωmax) of the focus adjustment angular velocity.

That is, in the first embodiment, the maximum angular velocity ω from the start of image blur detection to the completion of focus adjustment ω
If max is memorized and the angular velocity detected after the end of focus adjustment exceeds the maximum angular velocity ωmax, ωma
Limit to x. The CPU 25 uses the angular velocity sensors 1a, 2
It is determined whether or not the current angular velocity ω detected by a is greater than or equal to the stored maximum angular velocity ωmax (S301),
If ωmax or more, ω ′ = ωmax (S302),
If it is smaller than ωmax, ω '= ω is set (S303) and the process returns, until the release button is fully pressed (S21).
6) The image blur prevention control is repeated according to the changed angular velocity ω '(S217).

(Second Embodiment) FIG. 6 is a view for explaining a second embodiment of a camera equipped with an image blur prevention device according to the present invention. FIG. 6A shows an image blur prevention change. FIG. 6B is a flowchart showing the processing subroutine, and is a diagram for explaining the shift range of the blurring prevention optical system. In addition, since each embodiment described below has substantially the same hardware configuration as that of the first embodiment, the same reference numerals are given to the description, and duplicated illustration and description will be omitted. The second embodiment is an anti-shake lens 1
The shift amount x of 0 is limited. Figure 6
As shown in (B), when the normal shift amount during image blur prevention control is x _a , the shift amount x ′ during change is set in a narrower range than that.

The CPU 25 determines whether or not the shift amount x of the anti-shake lens 10 to be controlled is equal to or greater than the shift amount x'at the time of change (S401). Is stopped (S402), and if smaller than x ', control is continued (S403) and the process returns.

(Third Embodiment) FIG. 7 is a block diagram for explaining a third embodiment of a camera equipped with an image blur prevention device according to the present invention. In the third embodiment, the image blur is prevented by a half of the detected angular velocity. The arithmetic circuits 3a and 3b calculate, based on the angular velocity ω detected by the angular velocity sensors 1 and 2,
By calculating ω '= 0.5ω, the image blur prevention circuit 3e controls the image blur prevention based on the calculated ω'. In the step corresponding to S214 in FIG. 2, the image blur prevention control is performed by changing to ω '. In this embodiment, when the image blur prevention is performed, the driving speed of the image blur prevention lens 10 can be halved to facilitate the composition correction.

(Fourth Embodiment) FIG. 8 is a block diagram for explaining a fourth embodiment of a camera equipped with an image blur prevention device according to the present invention. In the fourth embodiment, the frequency of image blur to be controlled, 1 to 15 Hz, is changed to 5 to 15 Hz. This is because the frequency of the vibration of the camera when the composition is corrected is considered to be 5 Hz or less, so that the frequency is cut to prevent image blur. Filters 1b and 2 shown in FIG. 4 (first embodiment)
b is a bandpass filter of 1 to 15 Hz,
Further, in the fourth embodiment, as shown in FIG. 6, ω ′ is set through filters 3c and 3d that cut low frequencies. At the step corresponding to S214 of FIG.
Change to to control the image blur prevention.

(Fifth Embodiment) FIG. 9 is a flow chart for explaining a fifth embodiment of a camera provided with an image blur prevention device according to the present invention. The fifth embodiment is the AF mode switch 3
It is determined whether 1 is the AF single mode or the AF continuous mode (2 in S213), and if it is the AF single mode, the blurring prevention control is changed (S21).
4) In the case of the AF continuous mode, the process is jumped to step S215 of FIG. 3 without changing the blur prevention control. In the AF continuous mode, even after the focus is adjusted once, the focus will always be adjusted according to the movement of the subject, so it is better to prevent image blur as usual and use the "focus lock". This is because there is no difficulty in changing the composition, as is not used together.

(Sixth Embodiment) FIG. 10 is a flow chart for explaining a sixth embodiment of a camera equipped with an image blur prevention device according to the present invention. In the sixth embodiment, after the image blur prevention control is changed (S214), it is determined whether or not the automatic focus adjustment is completed (S214-2).
If not completed, go to step S215 of
The procedure is returned to step S209. In this case, in particular, even if the step of determining the AF mode is not provided, the A
The F mode can be determined. That is, when the automatic focus adjustment is not completed (in the AF continuous mode), the automatic focus adjustment is performed again (S210), each time,
The image blur prevention control is changed (S214). Further, even in the AF single mode or in the AF continuous mode, if the composition is not changed, the automatic focus adjustment is completed, so that the process can proceed to the next step.

The present invention is not limited to the embodiments described above, and various modifications and changes are possible, which are also included in the present invention. For example, the operation of each of the above-described embodiments can be applied even during continuous shooting. Further, in the case of the sixth embodiment, it is determined whether or not the automatic focus adjustment is completed (S214-2), and if it is not completed, the change of the image blur prevention is canceled. Good.

[0037]

As described in detail above, according to the present invention, when the composition is corrected after the automatic focus adjustment is completed, for example, the speed of image blur prevention is slowed, and the angular velocity at the time of the composition correction is adjusted. Since the image blur prevention control is changed by limiting or cutting the frequency when the composition is corrected, the composition can be corrected as desired while performing the image blur prevention control. Also, especially when using manual focus,
Since you can cancel the unnecessary image blur prevention change,
Battery consumption can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a camera equipped with an image blur prevention device according to the present invention.

FIG. 2 is a flowchart (No. 1) showing the first embodiment of the camera provided with the image blur prevention device according to the present invention.

FIG. 3 is a flowchart (No. 2) showing the first embodiment of the camera provided with the image blur prevention device according to the present invention.

FIG. 4 is a circuit block diagram illustrating in detail an angular velocity sensor unit of the camera according to the first embodiment.

FIG. 5 is a flowchart showing an image blur prevention changing processing subroutine of the camera of the first embodiment.

6A and 6B are views for explaining a second embodiment of the camera provided with the image blur prevention device according to the present invention, and FIG. 6A is a flowchart showing an image blur prevention change processing subroutine;
FIG. 7B is a diagram illustrating a shift range of the blurring prevention optical system.

FIG. 7 is a block diagram illustrating a third embodiment of a camera including an image blur prevention device according to the present invention.

FIG. 8 is a block diagram illustrating a fourth embodiment of a camera including an image blur prevention device according to the present invention.

FIG. 9 is a flowchart illustrating a fifth embodiment of a camera including an image blur prevention device according to the present invention.

FIG. 10 is a flowchart illustrating a sixth embodiment of a camera including an image blur prevention device according to the present invention.

[Explanation of symbols]

 1, 2 Angular velocity sensor 3 CPU 4 Drive circuit 5 Motor 6 Image blur control release switch 7 Aperture 8 First lens 9 Focusing lens 10 Anti-blurring lens 11 Focus adjustment ring 12 Focus adjustment changeover mechanism 13 Focus adjustment changeover switch 22 Photometry Circuit 23 Distance measuring circuit 24 DX reading circuit 25 CPU 26 Shutter control circuit 27 Aperture control circuit 28 Focusing control circuit 29 Display control circuit 20 Half-press switch 21 Full-press switch 31 AF mode switch

Claims (7)

[Claims] 1. A blur detection device for detecting image blur, a blur prevention drive device for changing a photographing optical axis to drive a blur prevention optical system, and the blur prevention drive based on an output of the blur detection device. In a camera equipped with an image blur prevention device including an anti-shake control device for controlling the device, a focus adjustment device for performing focus adjustment of a photographing optical system, and a focus adjustment for detecting completion of focus adjustment of the focus adjustment device. Completion detection device, the blur prevention control device, the focus adjustment completion detection device is provided with an image blur prevention device, characterized by changing the image blur prevention control after detecting the completion of focus adjustment camera. 2. The camera provided with the image blur prevention device according to claim 1, wherein the blur prevention control device detects the blur adjustment device after the focus adjustment completion detection device detects the focus adjustment completion. A camera provided with an image blur prevention device, characterized in that the size of the image blur is changed or limited to perform image blur prevention control. 3. A camera including the image blur prevention device according to claim 1, wherein the blur prevention control device detects the blur adjustment device after the focus adjustment completion detection device detects the focus adjustment completion. A camera equipped with an image blur prevention device, characterized in that the frequency of the image blur is changed or limited to perform image blur prevention control. 4. A camera provided with the image blur prevention device according to claim 1, wherein the image blur prevention controller controls the image blur prevention drive device after the focus adjustment completion detector detects the focus adjustment completion. A camera provided with an image blur prevention device, characterized in that image blur prevention control is performed by changing or limiting a shift amount. 5. A blur detection device for detecting an image blur, a blur prevention drive device for driving a blur prevention optical system by changing a photographing optical axis, and the blur prevention drive based on an output of the blur detection device. In a camera equipped with an image blur prevention device including an image blur prevention control device that controls the device, an automatic focus adjustment device that measures the distance to the subject and automatically adjusts the focus, and a manual operation by operating the operation unit. A focus adjustment switching device that switches between the automatic focus adjustment device and the manual focus adjustment device, and the blurring prevention control device is a focus adjustment method by the focus adjustment switching device. A camera provided with an image blur prevention device, characterized in that the image blur prevention control is changed according to the above. 6. The camera provided with the image blur prevention device according to claim 5, wherein the blur prevention control device changes the image blur prevention control after completion of focus adjustment during automatic focus adjustment. A camera equipped with an image blur prevention device. 7. A camera provided with the image blur prevention device according to claim 5 or 6, wherein the automatic focus adjustment device has an AF single mode and an AF continuous mode, and the blur prevention control The device is the AF of the automatic focus adjustment device.
A camera provided with an image blur prevention device, characterized in that image blur prevention control is changed according to a mode.