JPH0980576A - Camera with shake correction function - Google Patents

Abstract

(57) [Abstract] [Purpose] Accurate shake correction is performed even in continuous shooting mode, and current consumption is suppressed as much as possible. A shake reference calculation means for calculating a reference value of camera shake, a shake detection device for detecting shake based on the reference value, and a continuous shooting mode selection means for instructing the camera to a continuous shooting mode or a non-continuous shooting mode. A control device for controlling the shake detection device according to an instruction from the continuous shooting mode selection means, and the control device, when the continuous shooting mode is selected,
The shake reference calculation means is operated up to a specific number of shots in a series of shootings, and the operation after the specific number of shots is prohibited.

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 a shake correction device and having a continuous shooting mode.

[0002]

2. Description of the Related Art Conventionally, in a camera shake correction camera, when detecting a camera shake for camera shake correction control, the camera shake reference signal level has been detected for each photographing.

[0003]

Therefore, when the continuous shooting mode is selected in the camera having the conventional shake correction control function, the camera shake reference signal level has to be detected for each photographing, and the sampling time and the calculation time are reduced. The total time was a major obstacle to improving the number of frames shot per hour.

The present invention has been made in view of the above problems, and it is an object of the present invention to improve the number of frames to be shot even in the continuous shooting mode in which shake correction control is performed.

[0005]

In order to achieve this object, a camera having a shake correction function of the present invention detects a shake based on the shake reference calculation means for calculating a reference value of camera shake. And a control device for controlling the shake detection device according to an instruction from the continuous shooting mode selection means. When the continuous shooting mode is selected, the device is configured to operate the shake reference calculation means up to a specific number of shots in a series of shootings, and prohibit the operation after the specific number of shots.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a camera having a shake correction function having the above-described structure, in continuous shooting mode, the shake reference calculation means is operated up to a specific number of shots in a series of shootings, and operation after the specified number of shots is prohibited. As a result, accurate shake correction can be performed even in the continuous shooting mode, and current consumption can be suppressed as much as possible.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block connection diagram showing an embodiment of a camera having a shake correcting function according to the present invention.

In FIG. 1, the taking lenses 11 and 12,
It is composed of four lenses 13 and 14. Among these, the shake correction lens 13 is a shake correction lens that can be driven in the X-axis (camera longitudinal direction) direction and the Y-axis (camera lateral direction) direction for shake correction. The CPU 1 is a one-chip microcomputer, and is a control device that controls the entire sequence of the camera. The CPU 1 has a counter function,
It shall have a clock timer function to measure time and an A / D conversion function.

The distance measuring circuit 2 is a circuit for measuring the distance to a subject. The photometric circuit 21 is a circuit for photometrically measuring the peripheral portion of the object field. The shake display device 22 displays a shake detection state. The main switch 18 is a switch for starting the operation of the camera. Main switch 18
Is a momentary switch. When the camera is off and the main switch signal is input when the switch is pressed, the power of the camera is turned on, and when the camera is on and the main switch signal is input, the power of the camera is turned off. The half-press switch 19 is a switch for starting shooting preparation by pressing the shutter release button halfway. The release switch 20 is a switch that is turned on by fully pressing the shutter release button. Non-volatile memory 23 (hereinafter E
² PROM 23) is a writable non-volatile memory.

The shake detection circuit (angular velocity detection circuit) 3 is a circuit for detecting the angular velocity of the shake amount of the camera in the X-axis direction (longitudinal direction of the camera) about the Y-axis. Shake detection circuit 4
Is a circuit for detecting the angular velocity of the Y-axis (short direction of the camera) centered on the X-axis. The motor drive circuit 5 is a circuit for controlling the motor 8, and the motor 8 drives the shake correction lens 13 to X.
Drive in the axial direction. The motor drive circuit 6 is a circuit that controls the motor 9, and the motor 9 drives the shake correction lens 13 in the Y-axis direction. The motor drive circuit 7 is a circuit that controls the motor 10 that drives the focus lens 14.

The lens position detection circuit 15 is a circuit for detecting the position (movement amount) of the shake correction lens 13 in the X-axis direction. The lens position detection circuit 16 is a circuit that detects the position (movement amount) of the shake correction lens 13 in the Y-axis direction. The blur detection circuit 3 and the blur detection circuit 4 are circuits for correcting camera shake. Shake detection circuit 3 and shake detection circuit 4
Means that the output value changes according to the angular velocity generated by the shake of the camera. The CPU 1 A / D-converts this output value to detect the angular velocity of shake. The blur detection circuit 4 detects an angular velocity in the Y direction centered on the X axis.

The motor drive circuit 5 duty-drives the motor 8. The motor drive circuit 6 duty-drives the motor 9. The CPU 1 outputs a drive direction signal to the motor drive circuits 5 and 6 to instruct the drive direction of the motors 8 and 9. The CPU 1 also outputs a drive duty signal to the motor drive circuits 5 and 6 to instruct the drive speed of the motors 8 and 9. The motor drive circuits 5 and 6 energize the motors 8 and 9 in a designated direction at an arbitrary duty according to these signals, and control the shake correction lens 13 at an arbitrary speed.

The CPU 1 calculates the distance measuring data obtained by the distance measuring circuit 2. According to the calculation result, the CPU 1
Instructs the motor drive circuit 7. The motor drive circuit 7 controls the focus lens 14 at an arbitrary speed by energizing the motor 10 in the direction designated by the CPU 1. The rotation of the motor 8 is converted into a linear motion by a correction lens drive mechanical system (not shown), and drives the shake correction lens 13 in the X-axis direction. The rotation of the motor 9 is converted into a linear motion by a correction lens drive mechanical system (not shown), and drives the shake correction lens 13 in the Y-axis direction. The rotation of the motor 10 is converted into a linear movement by a focus lens drive mechanical system (not shown), and drives the focus lens 14 in the optical axis direction.

The lens position detection circuit 15 outputs a pulse according to the amount of movement of the shake correction lens 13 in the X-axis direction. The CPU 1 reads the position and movement amount in the X-axis and Y-axis directions by counting these pulse numbers. Further, the CPU 1 calculates the moving speed in the X-axis and Y-axis directions by detecting the moving amount for a certain period of time. The lens position detection circuit 17 outputs a pulse according to the amount of movement of the focus lens 14 in the optical axis direction. CPU
The number 1 reads the position and movement amount of the focus lens 14 in the optical axis direction by counting the number of pulses.

The E ² PROM 23 is a non-volatile memory in which predetermined data necessary for radiographing is pre-written. CP when it is necessary for the prescribed sequence to be performed
U1 reads the predetermined data from the E ² PROM 23. The mode selection device 24 is a device for the photographer to select a shooting mode, and can select a continuous shooting mode or a self mode.

FIG. 2 is a flow chart showing the main flow of the present invention. The power has already been turned on, the main switch 18 is already on, and step S20
It is assumed that the process is started from 0. First, in step S201, the inside of the CPU 1 is initialized. Next, in step S202, the photographer selects a photographing mode using the mode selection device 24. Next, in step S203, it is determined whether or not the continuous shooting mode is selected. If it is determined that the continuous shooting mode is selected, the process proceeds to step S204 and the continuous shooting process is performed. When the continuous shooting process ends, step S207
If the main switch 18 is off in step S203, the process proceeds to step S205 to end the process.

If it is determined in step S203 that the continuous shooting mode has not been selected, the process waits until the half-push switch 19 is turned on in step S205 or the main switch 18 is turned off in step S207. When it is determined in step S207 that the main switch 18 is off, the process proceeds to step S208 and ends. After that, it waits for the main switch 18 to be turned on again. When the main switch 18 is turned on, the process is restarted from step S200. When the half-push switch 19 is turned on in step S205, the process proceeds to step S206 to call the photographing process.

The operation of the embodiment of the present invention will be described with reference to the flow charts shown in FIGS. The control program of this flowchart is built in the CPU 1.

In this embodiment, the distance measuring execution time of the distance measuring circuit 2 is 0 to 300 ms, and the light measuring execution time of the light measuring circuit 21 is 50 ms.
ms, the drive time of the focus lens 14 is 100 ms,
The circuit stabilization time of the shake detection circuits 3 and 4 is 300 ms,
The shock avoidance time during release is 50 ms, the zero angular velocity detection time is 900 ms, and the run-up control time for stabilizing the shake correction control is 20 ms.

FIG. 3 shows the normal photographing process of FIG. 2 (step S
206) is a flowchart for explaining the details of (206).

When it is confirmed that the half-push switch 19 is turned on,
The process starts from step S300 in FIG. First, in step S301, the blur detection circuits 3 and 4 are activated.
Next, in step S302, a timer A (a timer for zero angular velocity detection time, which measures 900 ms in this embodiment) is started, and in step S303 a flag A is set.
Is set to 0. Next, in step S304, photometric processing is executed, and in step S305, distance measuring processing is executed.

Then, in step S306, step S3
AE calculation is performed on the photometry result executed in step 04, and step S30
In step 7, FM calculation is executed using the result of distance measurement executed in step S305. The wait time T1 in the next step S308 is necessary to secure the circuit stabilization time of the shake detection circuits 3 and 4. In this embodiment, the blur detection circuit stabilization time is 300 ms, and the distance measurement time 0 to 300 ms and the photometry time 50 ms are subtracted from 0 to 250 ms.
The wait time T1 is 50 ms. Step S309
Then, the focus lens 14 is driven to a predetermined drive destination according to the distance measurement value set in step S305.

In the next step S310, the blur detection circuit 3
Then, it is determined whether or not the output from each of FIGS. When it is determined in step S310 that the shake amount is smaller than the predetermined value C, step S3
In 11 the display of the shake indicator 22 is turned on and the process proceeds to step S401 in FIG. The lit display of the shake indicator 22 indicates that the detected shake amount is within the correctable range.

When it is determined in step S310 that the shake amount is larger than a predetermined value, the shake display 22 is changed to a blinking display of 2 Hz in step S312 and step S4 in FIG.
Go to 01. The 2 Hz blinking display of the shake indicator 22 indicates that the detected shake amount is large and it is not known whether shake correction can be performed.

In step S401 of FIG. 4, the flag A is confirmed, and the flag A set in step S303 is set to 0.
If so, the process proceeds to step S402. Step S
If it is determined in 401 that the flag A is set to 1, the process proceeds to step S404. When it is confirmed in step S402 that the timer A has timed up (when the angular velocity is zero, 900 ms has passed in this embodiment),
After the flag A is set to 1 in step S403, the process proceeds to step S404.

In step S404, it is confirmed that the release switch 20 is turned on, and if it is determined that the release switch 20 is turned on, the process proceeds to step S501 in FIG. When it is determined in step S404 that the release switch 20 is off, the next step S40
Confirm that the half-push switch 19 is on by pressing 5.

When it is confirmed that the half-push switch 19 is off in step S405, the blur detection circuits 3 and 4 are stopped in step S406. After that, the flag A is confirmed in step S407, and if the flag A is 1, step S40
9. If 0, then in step S408 timer A
Is stopped and the process proceeds to step S409. In step S409, the display of the shake indicator 22 is turned off, and then the process returns from step S410 to the flowchart of FIG. In this case, shooting is not performed.

When it is confirmed in step S405 that the half-push switch 19 is turned on, it is determined in next step S411 whether the outputs from the shake detection circuits 3 and 4, that is, the shake amount is smaller than a predetermined value C or not. If it is determined that the shake amount is smaller than the predetermined value, the display of the shake display device 22 is turned on in step S412, and the process proceeds to step S401. If it is determined that the shake amount is larger than the predetermined value C in step S411, the display of the shake indicator 22 is changed to 2H in step S413.
The display blinks z and the process returns to step S401.

In step S501 of FIG. 5, it is determined whether or not the self mode is set. In the case of the self mode (YES), a self timer (for example, 10) is set in step S505.
Seconds), the process proceeds to step S506. Step S50
If it is determined that the mode is not self mode (NO) in 1,
In step S502, it is determined whether the red-eye mode is set. If it is determined in step S502 that the red-eye mode is not set,
After waiting for a wait time T2 (a shock avoidance time at the time of release, which is 50 ms in this embodiment) in step S504, the process proceeds to step S506. If the red-eye mode is determined in step S502, pre-irradiation for 1 second is performed in step S503, and then the process proceeds to step S506.

In step S506, step S31
1, turn off the display of the shake display 22 displayed in step S312, step S412, or step S413,
It proceeds to step S507. In step S507, the state of the flag A is confirmed, and if it is determined to be 1, the process proceeds to step S509. When it is determined to be 0 in step S507, the process waits in the next step S508 until the timer A started in step S302 expires, and after the lapse of time, the process proceeds to step S509.

In step S509, the shake correction lens 1
3 is moved from the initial reset position to the center position of the optical axis, and the center of the shake correction lens 13 is moved. Step S51
The shake correction is started at 0, waits for the wait time T3 (the run-up control time for stabilizing the shake correction control, which is 20 ms in this embodiment) in step S511, and then proceeds to step S512. In step S512, the shutter starts to open.

The shake correction process continues from step S510 before the opening of the shutter to step S514 immediately after the shutter is completely closed. In step S512, an EV value according to the AE calculation value obtained in step S306 is opened for a predetermined time. Thereafter, the shutter closing process is executed in step S513, and the shake correction process is stopped in step S514. Next, in step S515, the blur detection circuits 3 and 4 are stopped. Next, in step S516, the shake correction lens 13 is returned to the initial position, and in step S517
The focus lens 14 is driven to the predetermined reset position. Next, in step S518, the film is wound up, and the flow chart of FIG.
207).

6 and 7 show flowcharts of the continuous shooting process (step S204 in FIG. 2). When it is determined in step S203 of the main flow in FIG. 2 that the continuous shooting mode is selected, the continuous shooting process is performed.

When the half-push switch 19 is checked in step S601 and the half-push switch 19 is off, the flow advances to step S602 to return to the main flow.

If it is determined in step S601 that the half-push switch 19 is turned on, the flag N is set to 0 in step S603.

In the next step S604, the blur detection circuit 3
And 4 are started, and flag N is set in the next step S605.
Is 0 or not. If the flag N is 0, the wait of the wait time T1 is awaited in step S607. The wait time T1 is necessary to secure the circuit stabilization time of the shake detection circuits 3 and 4. In this embodiment, the blur detection circuit stabilization time is 300 ms, and the distance measurement time 0 to 300 ms and the photometry time 50 ms are subtracted from 0 to 250 ms.
Let s be the wait time T1.

Then, in step S607a, a shake reference value is calculated. Generally, since the output signals of the shake detection circuits 3 and 4 include a drift amount, the shake reference signal is calculated in step S607a in order to remove the drift amount and obtain an accurate angular velocity. . The shake reference signal is calculated by averaging the output signal of the shake detection circuit 3 or 4 in a time shorter than the period of the drift component included in the output signal of the shake detection circuit 3 or 4. After this step S607a, the blur detection circuit 3
Alternatively, the shake amount is detected by 4 (step S607).
b).

Next, in step S608, photometry processing is executed, and in step S609, distance measurement processing is executed. In the subsequent step S610, the AE calculation of the photometric result executed in step S608 is performed, and the FM calculation is executed in step S611 using the distance measurement result executed in step S609. In step S612, the focus lens 14 is driven to a predetermined drive destination according to the distance measurement value set in step S305, and then the process proceeds to step S701 (FIG. 7). In step S613, it is determined whether or not the shake amount is smaller than the predetermined value C. If it is determined that the shake amount is smaller than the predetermined value C, the display of the shake display unit 22 is turned on in step S614, and the process proceeds to step S701.
2 is blinked at 2 Hz and the process proceeds to step S701.

In step S701, it is checked whether or not the release switch 20 is turned on. If it is off, the process proceeds to step S702 to check whether or not the half-push switch 19 is turned on. If the half-push switch 19 is turned on in step S702, the process returns to step S605 again to confirm whether the release switch 20 is on or off. If it is determined in step S702 that the half-push switch 19 is turned off, the blur detection circuits 3 and 4 are stopped (step S702a), and then the continuous shooting process is ended in step S703.

In step S701, the release switch 20
If it is determined that is turned on, the process proceeds to step S704. In step S704, the center of the shake correction lens 13 is moved from the initial reset position to the center position of the optical axis. After the shake correction is started in step S705, the process proceeds to step S707.

In step S707, the shutter starts to open. The shake correction process continues from step S705 before the opening of the shutter to step S709 immediately after the shutter is completely closed. In step S707, the EV for the predetermined time is opened with the EV value according to the AE calculated value obtained in step S610. Thereafter, the shutter closing process is executed in step S708, the shake correction process is stopped in step S709, the shake correction lens 13 is returned to the initial position in step S710, and the focus lens 1 is returned in step S711.
4 is driven to a predetermined reset position.

Next, in step S712, one frame of film is wound up, and in step S713, the release switch 2
Check if 0 is on. When the release switch 20 is on, the flag N is set to 1 (step S714), and then the process returns to step S605 (FIG. 6) again to restart shooting. If the release switch 20 is off in step S713 and the half-push switch 19 is off (step S713a), the process proceeds to step S715, the shake detection circuits 3 and 4 are stopped, and the main flow from step S716 (see FIG. 2). Step S2
Return to 07). When the half-push switch 19 is on, the process returns to step S605.

[0044]

As described above, according to the camera having the shake correcting function of the present invention, in the continuous shooting mode, the shake reference calculating means is operated up to the first frame in a series of photographing,
Since the reference signal calculated in the first frame is used for the second and subsequent frames, accurate shake correction can be performed even in the continuous shooting mode, and the current consumption can be suppressed as much as possible.

[Brief description of drawings]

FIG. 1 is a block connection diagram showing an embodiment of a camera having a shake correction function according to the present invention.

FIG. 2 is a flowchart showing an embodiment of a camera having a shake correction function according to the present invention.

FIG. 3 is a flowchart showing an embodiment of a camera having a shake correction function according to the present invention.

FIG. 4 is a flowchart showing an embodiment of a camera having a shake correction function according to the present invention.

FIG. 5 is a flowchart showing an embodiment of a camera having a shake correction function according to the present invention.

FIG. 6 is a flowchart showing an embodiment of a camera having a shake correction function according to the present invention.

FIG. 7 is a flowchart showing an embodiment of a camera having a shake correction function according to the present invention.

[Explanation of symbols]

 1 CPU 2 Distance Measuring Circuit 3 Shake Detection Circuit 4 Shake Detection Circuit 5 Motor Drive Circuit 6 Motor Drive Circuit 7 Motor Drive Circuit 8 Motor 9 Motor 10 Motor 13 Shake Correction Lens 14 Focus Lens 15 Lens Position Detection Circuit 16 Lens Position Detection Circuit 17 Lens position detection circuit 18 Main switch 19 Half-press switch 20 Release switch 21 Photometric circuit 22 Display 23 Non-volatile memory 24 Mode selection device

Claims (2)

[Claims] 1. A shake reference calculation means for calculating a camera shake reference value, a shake detection device for detecting shake based on the reference value, and a continuous shooting mode for instructing the camera to a continuous shooting mode or a non-continuous shooting mode. The control device controls the shake detection device according to an instruction from the continuous shooting mode selection device, and when the continuous shooting mode is selected, the control device specifies in a series of shootings. A camera having a shake correction function, characterized in that the shake reference calculation means is operated up to the number of shots, and the operation after the specific number of shots is prohibited. 2. A camera having a shake correction function according to claim 1, wherein the specific number of shots in a series of shots is one.