JPH07281239A - Camera provided with shake correcting device - Google Patents

Abstract

PURPOSE:To prevent a picture not so good from being taken because light is superposed on a main subject even when a partially light part exists on the background of the subject by setting proper discontinuing time in circumstances where strong vibration exceeding the ability limit of a vibration proof device is caused in the case of flash-synchro photographing. CONSTITUTION:This camera is provided with a photographing auxiliary light emitting device, a shake amount detecting device 1, and a shake correcting device 4 correcting shake based on a shake signal from the detecting device 1. As for relation between the longest shutter time in the case of flash-synchro photographing on which light is emitted synchronizing with a shutter and the longest shutter time in the case of non-flash-synchro photographing on which the photographing auxiliary light emitting device is not allowed to emit light; the longest shutter time in the case of flash-synchro photographing is made shorter than or equal to that in the case of non-flash-synchro photographing at the time of performing the flash-synchro photographing while driving the correcting device 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera equipped with a shake correction device.

[0002]

2. Description of the Related Art In a conventional camera having this type of anti-vibration device, as compared with a camera having no anti-vibration device, when the shutter operation is terminated, the anti-vibration device acts to bring it closer to the slow shutter side. Is possible. However, the discontinuation time is present in each of the cameras capable of switching the strobe light emission mode and the light emission prohibition mode, but there is no indication regarding the discontinuation time of the shutter operation in both relations.

[0003]

In the case of flash photography, since the flash duration of the flash is short, there is no problem in terms of camera shake with respect to the main subject, but the background blurs when shooting with a slow shutter too much. There was a point. In particular, when strong blurring occurs in the background with a partially bright portion, the light overlaps with the main subject, resulting in an unsightly photograph.

The present invention has been made in view of such a situation. Even in a situation where a strong shake exceeding the capacity limit of the vibration isolator occurs during flash synchronization, by setting an appropriate cutoff time, An object of the present invention is to prevent the light from overlapping the main subject and making an unsightly photograph even when the background of the subject has a partially bright portion.

[0005]

In order to achieve the above object, the present invention provides a photographing auxiliary light emitting device, a blur amount detecting device, and a blur correcting device for correcting blur based on a blur signal of the blur amount detecting device. In a camera equipped with, when performing flash shooting while driving the image stabilization device, the longest shutter time for flash synchronized shooting that synchronizes with the shutter and the shooting auxiliary light emission device that does not fire the flash The relationship with the maximum shutter time is that the maximum shutter time during flash sync photography is shorter than that without flash.
Or, they are configured to be equal to each other.

[0006]

In the camera equipped with the blur correction device having the above-described structure, even when a strong shake exceeding the capacity limit of the image stabilizer occurs during flash synchronization, the background time of the subject can be set by setting an appropriate cutoff time. Even in the case where there is a bright portion in part, it is possible to prevent the light from overlapping the main subject and becoming an unsightly photograph.

[0007]

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 equipped with a blur correction device according to the present invention.

In FIG. 1, reference numeral 1 denotes a shake detecting means for detecting a shake situation associated with camera shake or the like,
A half-press switch SW1 is turned on by a half-press operation of an operation member, for example, a shutter release button (not shown) provided on the upper end of the camera, whereby the CPU 2 provided in the camera activates the shake amount detecting means 1. Start it up,
In addition, the shake amount detection means 1 detects the shake amount of the camera body after a predetermined time has elapsed. CPU
Reference numeral 2 is used as shake detection control means together with the half-press switch SW1 of the release button.

3 is the I of the film loaded in the camera.
It is a film sensitivity detecting means for detecting the SO sensitivity. Four
Is a shake correction unit provided in the camera. When the release button (not shown) is fully pressed, the full-press switch SW2 is turned on, and the CPU 2 performs correction by the detection of the shake amount detection unit 1 (shake amount). The shake correction means 4 is instructed, and the shake correction means 4 drives the drive system 5 of a part of the optical system (shake correction optical system L3) of the photographing optical system L1 to move the shake correction optical system L3 in the vertical direction in the drawing ( Image blur correction is performed by shifting driving in the direction (perpendicular to the optical axis).

Reference numerals 6 and 7 denote a distance measuring means and a light measuring means for measuring the distance to the object and the brightness of the object. By pressing the release button halfway (SW1 ON),
The CPU 2 activates the distance measuring unit 6 and the light measuring unit 7, and the distance measurement and the light measurement are executed by the activation.

Denoted at 8 is a focusing control means. In accordance with an output (distance measurement result) signal from the distance measuring means 6, the CPU 2 instructs the focusing control means 8 to perform an autofocus (automatic focusing), and the focusing control is performed by this instruction. The means 8 drives the optical system L2 via the drive system 9 (focusing means) of the focusing optical system L2 to perform autofocus.

Reference numeral 10 denotes an exposure control means, and the CPU 2 instructs the exposure control means 10 to control the aperture corresponding to the aperture value in accordance with the output (photometry result) signal of the photometry means 7.
By this command, the exposure control means 10 drives and controls the diaphragm member 11 to control the exposure.

Next, the operation of the CPU 2 will be described with reference to the flowchart of FIG.

If the release button is pressed halfway with the main power switch of the camera turned on, the process proceeds from step S101 to step S102 in FIG.
By turning on, the process proceeds to S103, and the CPU 2 checks whether or not the battery is insufficient.

When it is determined that the battery is sufficient, the routine proceeds to S104, the shake detecting means is activated, and the sampling of the sensor signal is started at S105.

Then, the procedure proceeds to S106, in which the photometry and distance measurement of the subject are performed, and then the exposure calculation is performed in S107 to obtain data as to whether or not shooting in the SB (strobe) mode is performed, and then in S108. FM calculation is performed to determine the aperture value for SB light emission.

In step S109, the focusing lens number 1 is calculated from the distance measurement result, and in step S110, it is determined in the SB mode determination step shown in FIG. 7 whether or not the SB light emission photographing condition is present. If SB light emission is necessary, the step S111 is performed. S10
If the distance measurement result in 6 is equal to or greater than the predetermined value A, the low speed A in S112
The shooting operation set in the E mode is performed. When the value is closer than the predetermined value A, it is determined in S113 whether the SB light emission prohibition mode is set by the selection by the external operation switch. When the SB light emission prohibition is set, the low speed AE mode is set in S112. If the SB wave height prohibit mode is not set, the process proceeds from S113 to S114, and it is determined whether or not the slow sync mode is set. If the slow sync mode is set, the slow sync mode of S116 is performed. If not, the process proceeds to S115 and the SB mode is set. Shooting will be done.

If it is determined in S110 that the SB light emission is not necessary, the process proceeds to S118, and it is determined whether the forced SB mode is selected or not by the external operation switch. If the forced light emission is selected, the SB mode in S115 is set. Otherwise, in S119, the high speed AE mode is set and shooting is performed.

After each mode is finished, one frame of film is wound in S117 and the operation is finished.

FIG. 3 shows the low speed AE mode (S112 in FIG. 2).
In S201, the low-speed AE mode is entered, and in S202, the release button is pressed halfway.
It is determined whether or not is on.

If SW1 is not on, the process returns to S102 in FIG.

If the half-push switch SW1 is on, the routine proceeds to S203, where it is determined whether or not the release button is fully depressed. If it is fully depressed, the routine proceeds to S212 and the timer is operated. To start.

Next, in S204, the focusing optical system L2, which is a focusing lens, is moved to a predetermined position by the drive system 9 (see FIG. 1) based on the value calculated in S109.

Here, when the distance measurement result is far, the focusing optical system L2 is at the position L2 ″ in FIG. 1, and when the distance measurement result is close, it is at the position L2 ′. It becomes bigger and the focusing time becomes longer.

Here, as indicated by reference numeral 9 in FIG. 1, the moving means drives, for example, a stepping motor M to move the focusing optical system L2 in the optical axis direction via the rack and pinion. There is.

After the focusing operation is completed in S213, it is determined whether or not a predetermined time has elapsed, and if it is determined in S213 that the predetermined time has elapsed, S
Sampling of the sensor signal is ended in 205, and S206
The calculation standard of the shake amount is calculated in step S1, the current shake amount is calculated, and the shake correction unit is driven based on the calculated shake amount, whereby the shake correction operation of the shake correction lens L3 is started.

This shake correction operation is performed by rotating the motor M, for example, according to the shake amount, and shifting the shake correction lens L3 through the rack and pinion in the direction orthogonal to the optical axis.

Next, in S207, the shutter 11 starts to open, and in S208, the limiter, that is, the cutoff time is set so that the shutter time does not become longer than the predetermined shutter time. Therefore, if the time exceeds that time, the process proceeds to S210 and the shutter is released. Close 11,

On the other hand, if the predetermined time is not reached, S2
In 09, it is determined whether or not the proper exposure value calculated in S107 is reached, and when the proper value is reached, the process proceeds to S210 and the shutter 1
It is designed to close 1. Then, in S211, the process returns to the main routine of FIG.

FIG. 4 shows the operation in the SB mode (S115 in FIG. 2), and the SB mode is entered in S301.
In this mode, the limiter time is shorter than the limiter time in the AE mode.

SB mode of S301 to S303, SW1
The ON check of S2 and the ON check of SW2 are the same as S201 to S203 of FIG.
The charging state of the battery is judged, and if the charging is not completed, S30
Return to 2. Further, focusing in S <b> 305 to S <b> 308, sensor signal sampling end, shake correction start, and shutter opening are substantially the same as S <b> 204 to S <b> 207 in FIG. 3 described above except that the timer count is not performed.

In S309, it is determined whether or not the shutter (lens shutter) 11 has fallen to a predetermined lower value, and when the predetermined lower value (calculation result in S108) is reached, SB is caused to emit light in S310.

The termination time check, predetermined exposure check, shutter close, and return in S311 to S314 are the same as in S208 to S211 in FIG. 3, and detailed description thereof will be omitted.

FIG. 5 shows the slow sync mode (S1 in FIG. 2).
16), and the limiter time in this mode is the same as the limiter time in the AE mode.

Here, the slow sync mode, SW1 ON check, SW2 ON check, timer start, focusing, time up, sensor signal sampling end, shake correction start, and shutter open in S401 to S409 are the same as those in S201 to S201 in FIG. S207 (S21
2, including the timer count control in S213), and the description thereof will be omitted.

Further, the predetermined lower limit check, SB light emission, abort time check, predetermined exposure check, shutter close and return in S410 to S415 are the same as those in S309 to S314 in FIG. It is only longer than the SB emission mode.

FIG. 6 shows the high speed AE mode (S119 in FIG. 2).
The operation in this mode is substantially the same as that of the low speed AE mode in FIG. 3 described above and the timer count control in S212 and S213 is not provided, and the detailed description thereof will be omitted.

Here, in the SB mode determination in S601 (S110 in FIG. 2) in FIG. 7, as is clear from the figure, it is determined in S602 whether the subject brightness is smaller than the predetermined value B, When it is larger, the routine jumps to S606 to set the non-SB mode and returns in S605, while when it is determined that it is substantially equal to or smaller than the predetermined value B, the film sensitivity (ISO) is determined to be the predetermined value C in S603.
It will be readily understood that the SB mode is selected in step S604 when compared to, and equal to or less than.

It is needless to say that the present invention is not limited to the structure of the above-mentioned embodiment, and the configuration and the like of each part can be appropriately modified and changed.

For example, in the above-described embodiment, the shake amount detection reference value is calculated by the CPU 2 in conjunction with the half-press switch SW1 of the release button. However, the present invention is not limited to this, and a dedicated switch operation section is provided. May be.

FIG. 8 shows the output waveform of the image stabilization sensor (shake amount detection means 1) and the shift lens (shake correction optical system L).
The operation waveform of 3) is shown. The signal S1 shown in the upper part of FIG.
Shows the state of the half-push switch.
N, OFF when line is up. Also the signal S2
Indicates the state of the full-push switch, which is ON when the line is at the bottom and OFF when the line is at the top. "CAMER
A SHAKE ”is the angular velocity (ANGULAR VEL
The output waveform of the (OCITY) sensor (the shake amount detecting means 1) is shown. The output has two directions, PITCH and YAW.
“LENS POSITION” indicates the position of the shift lens (shake correction optical system L3). The position of the shift lens (shake correction optical system L3) is obtained and controlled by integrating the output of the angular velocity sensor (shake amount detection means 1). Focusing on the shift lens position in the yaw (YAW) direction, the maximum value Δ of the lens movement amount during the exposure time (indicated by the width EXP. Here, 1/4 second) is obtained. When the upper limit position of the lens position is shown by (a), the waveform immediately after the shutter is closed becomes a straight line and coincides with (a). The point (b) during the shutter exposure period also matches this point (a). This line (a) is determined by the optical mechanism of the lens and the control of the control circuit. That is, this is the maximum value of the shake correction amount.

The maximum value of the shake shift amount is proportional to the exposure time. That is, as the exposure time becomes longer, the maximum value of the shake shift amount also increases. This is also clear from FIG. 8, and when the exposure time in the waveform of YAW becomes longer, the position of the shift lens comes into contact with the limit while trying to go upward from the line (a), and as a result, the effect of image stabilization is lost. That is,
In the camera shown in this embodiment, the maximum exposure time is 1
A reasonable value is / 4 seconds.

Table 1 shows a specific example of the abort time shown in FIG. 8 in seconds.

[Table 1]

In Table 1, the maximum shutter time during flash sync photography during flash sync photography and the maximum shutter time during flash non-flashing, the maximum shutter time during flash sync photography is greater than the maximum shutter time during non-flash flash photography. Short or equal to each other.

That is, when the image stabilization device (shake correction means 4) VR is ON (first row), the slow sync termination time is 1/4 second, and the flash off termination time is 1 / second.
It is set to 4 seconds, and the slow sync and flash-off termination seconds are set to be the same. It should be noted that the relationship may be set such that the slow sync termination time is equal to or less than the flash-off termination time. Also, the shutter release time at SB auto and slow sync was changed.
When is ON, it may be the same as during auto sync and during slow sync.

Anti-vibration device (shake correction means 4) VR is OFF
At the time of 2 (second row), as in the case of the conventional camera without the image stabilization device, the cutoff time in slow sync is set to 1/15. Also, when the SB is off, consider taking a tripod,
It is set to 1/4 second. During flash synchronization, the main subject is illuminated by the flash, so the image is captured more clearly than when the flash is off, and when strong light such as a light source is present in the background, blurring is more noticeable. Is because the shutter speed should not be faster than when the flash is disabled.

[0048]

As described above, according to the present invention, even in a situation where a strong shake exceeding the capacity limit of the image stabilizing device occurs during flash synchronization, by setting an appropriate cutoff time, the background of the subject can be set. Even in the state where there is a partially bright portion, it is possible to prevent the light from overlapping the main subject and making an unsightly photograph.

[Brief description of drawings]

FIG. 1 is a block connection diagram showing an embodiment of a camera provided with a blur correction device according to the present invention.

FIG. 2 is a flow chart showing an embodiment of a camera provided with a blur correction device according to the present invention.

FIG. 3 is a flow chart showing an embodiment of a camera provided with a blur correction device according to the present invention.

FIG. 4 is a flow chart showing an embodiment of a camera equipped with the blur correction device according to the present invention.

FIG. 5 is a flow chart showing an embodiment of a camera provided with the blur correction device according to the present invention.

FIG. 6 is a flow chart showing an embodiment of a camera provided with the blur correction device according to the present invention.

FIG. 7 is a flow chart showing an embodiment of a camera equipped with the blur correction device according to the present invention.

FIG. 8 is a characteristic diagram showing an embodiment of a camera equipped with the blur correction device according to the present invention.

[Explanation of symbols]

 1 shake amount detection means 2 CPU 4 shake correction means 5 drive system 6 distance measuring means 7 photometric means 8 focusing control means 9 drive system 10 exposure control means 11 diaphragm member

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshio Imura 3 2-3 Marunouchi, Chiyoda-ku, Tokyo Inside Nikon Corporation

Claims (1)

[Claims] 1. A camera including a photographing auxiliary light emitting device, a blur amount detection device, and a blur correction device for correcting blur based on a blur signal of the blur amount detection device, wherein a flash is provided while driving the blur correction device. When shooting, the relationship between the longest shutter time in flash sync shooting that synchronizes with the shutter and the longest shutter time when the flash does not fire with the shooting auxiliary light emitting device is A camera equipped with a shake correction device, characterized in that the maximum shutter time is shorter than or equal to the maximum shutter time when the flash is not fired.