JPH07281240A - Camera with function for correcting camera shake - Google Patents

Abstract

PURPOSE:To enable photographing in a dark place and excellent in background description by eliminating a problem that a background is not photographed in normal photographing in the dark place and flash photographing. CONSTITUTION:This camera is equipped with variable focus type photographing optical systems L1 and L2, a camera-shake correcting device 5 correcting camera-shake in accordance with a camera-shake state from a camera-shaking quantity detecting device 1, a photometry device 7, a stroboscopic light emitting device. Further, a controller 2 controlling exposure photographing at a speed lower than a shutter speed decided by the reciprocal of a focal length at least by one or more stages. The controller 2 executes the control in such a manner that the focal length as the reference of the shutter speed is set as the longest or shortest focal distance and a breaking off time at the time of photographing is made constant regardless of zooming.

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 correcting device for correcting image shake caused by camera shake and the like, and a shake correcting device having a variable focus type photographing optical system.

[0002]

2. Description of the Related Art In recent cameras, automatic exposure (A
E) mechanism, auto focus (AF) mechanism, etc., are electronically converted to various parts and are highly automated. One of such advanced functions is a shake correction function caused by camera shake that occurs during handheld shooting of the camera,
Various proposals have been made.

By the way, as a problem in performing such image blur correction, there is a possibility that required blur correction accuracy may not be obtained depending on a photographing condition.

That is, in a camera equipped with a conventionally known shake correction device, the simplest way to correct shake due to camera shake is faster than the shutter speed roughly determined by the reciprocal of the focal length of the taking lens. It is said that if the shutter is released at the shutter speed, camera shake can be prevented.

[0005]

However, the above-mentioned conventional camera causes a problem in the following cases, and causes a problem that required exposure photography cannot be appropriately performed. That is, when shooting with a telephoto lens, for example, if the focal length is 120 mm, then about 125
The shutter speed must be faster than one second, which makes it impossible to shoot in a dark place.

Further, when stroboscopic photography is performed, since the flash duration of the stroboscope is short, there is no problem in terms of camera shake with respect to the main subject, but there is a problem that the background shakes if the slow shutter is used. .

In particular, if a strong shake occurs in a state where there is a bright portion in the background, an unsightly photograph will result if the light overlaps the main subject. For this reason, even in the case of stroboscopic photography, the shutter speed does not become slower than the shutter speed in the vicinity of the reciprocal of the focal length described above.

That is, in the conventional camera, there is a problem that it is not possible to take a proper photograph including the background when photographing in a dark place, and it is necessary to take some measures. Also, even when using a flash, it cannot be said that the background light can be fully utilized.
Furthermore, even in the slow sync mode, it is not possible to take a natural picture taking advantage of the background, and such a point must be taken into consideration.

In particular, in this type of camera, it is necessary to have a structure in which the effect of the shake correction device can be exhibited even in shooting in a dark place, and zooming with a variable focus lens is necessary. While taking photographs while taking into consideration these points,
It is desired to take some measures that can solve the above-mentioned problems.

The present invention has been made in view of the above circumstances, and solves the problem that the background is not captured during shooting in a dark place or during flash shooting, enabling shooting in a dark place and stroboscopic shooting. The objective is to obtain a camera equipped with a shake correction device that can take natural photographs taking advantage of the background even at times.

[0011]

In order to meet such a demand, a camera equipped with a shake compensating device according to the present invention comprises a variable focus type photographing optical system, a shake compensating device, a photometric device, and a stroboscopic light emitting device. In addition, a control device that performs exposure shooting at a speed slower than at least one step with respect to the shutter speed determined by the reciprocal of the focal length, sets the focal length, which is the standard of the shutter speed, to the longest or shortest focal length, regardless of zooming of the shooting optical system. Instead, it is configured such that the cutoff time during shooting is controlled to be constant.

[0012]

According to the present invention, in a camera provided with a shake compensating device, since the shake does not occur even in the slow shutter, the reciprocal of the focal length is used for the purpose of clearly showing the background in normal shooting or flash shooting. With respect to the shutter speed determined by, the slow limit of the shutter speed is set so that shooting can be performed at least one step slower, and shooting with good depiction of a dark place or background is possible.

[0013]

1 to 3 show an embodiment of a camera equipped with a shake correcting apparatus according to the present invention. In these drawings, first, the internal structure of a camera to which the present invention is applied will be described with reference to FIG. Will be briefly described.

In the figure, reference numeral 1 is a shake amount detecting device for detecting a shake condition due to camera shake, etc., and is an operation member, for example, a shutter release button provided on the upper end of the camera although not shown. By the half-push operation of, the half-push switch SW1 in FIG. 1 is turned on,
As a result, the CPU 2 provided in the camera activates the shake amount detecting device 1 as the shake detecting device, and the shake amount detecting device 1 detects the shake amount of the camera body after a lapse of a predetermined time. There is.

Here, the CPU 2 is used as the shake detection control device as described above together with the half-press switch SW1 of the release button described above.

Further, in the figure, SW2 is a full-press switch which is turned on by the full-press operation of the above-mentioned release button. When the full-press switch SW2 is turned on, the exposure control device 10 performs a photographing operation as described later. Has become.

Further, reference numeral 3 in FIG. 1 denotes a display portion as a warning display device, which is constituted by a lamp (or an LED or the like) provided in the viewfinder of the camera, and activates the shake amount detecting device 1 or this. The CPU 2 is configured to blink, turn on, or turn off the lamp 3 described above according to the output signal of the shake amount detecting device 1. Here, the warning display control device is constituted by the display unit 3 and the CPU 2 which are formed by the lamp.

That is, when the half-press switch SW1 is turned on by half-pressing the release button, the shake amount detecting device 1
The CPU 2 blinks the lamp serving as the display unit 3 upon the start-up. Further, after the lapse of the predetermined time, when the shake amount of the camera body due to the detection signal is smaller than the predetermined amount according to the output of the shake amount detecting device 1, the CPU 2 sets the second state to turn on the lamp 3. Then
By the blinking or lighting of the lamp 3, the photographer himself
It is possible to judge whether or not the shake correction is possible in taking a picture.

It should be noted that the display unit 3 need not be a lamp provided in the viewfinder or in the peripheral portion thereof, but may be provided on the rear surface of the camera body and near the viewfinder window, for example, the field of view of the photographer including the viewfinder field of view. It may be a display unit such as a lamp or LED located inside.

Reference numeral 4 is a shake correction device, and when the release button is fully pressed, the full-press switch SW2 is turned on and the CP
U2 commands the shake correction device 4 to perform correction based on the detection (the shake amount) of the shake amount detection device 1, and the correction device 4 drives a part of the optical system (shake correction optical system L3) of the photographing optical system L1. The system 5 is driven, and the shake correction optical system L3 is shift-driven in the vertical direction (direction perpendicular to the optical axis), and the drive can correct the image shake of the subject image on the film surface in the entire photographing optical system. This is well known.

The shake correcting device 4 and its drive system 5 may have various known structures. In short, the shake correcting optical system L3 can be driven to shift in a direction perpendicular to the optical axis. Anything will do.

Reference numerals 6 and 7 are known distance measuring devices and photometric devices, and the CPU 2 activates the distance measuring device 6 or the photometric device 7 by half-pressing the release button (SW1 ON).
Upon activation thereof, the respective devices 6 and 7 perform distance measurement and photometry.

Here, the CPU 2 judges the shutter time from the result of photometry by the photometry device 7, and when the shutter time is a predetermined value or more, or when the switch SW3 described later is in the ON state, the release button is pressed. When the switch SW1 is turned on by a half-press operation, the shake amount detection device 1 is activated and the lamp of the display unit 3 is made to blink. Also,
When it is determined from the output signal of the shake amount detection device 1 that the shake amount of the camera body is smaller than the predetermined amount, the CPU 2 turns on the lamp of the display unit 3.

Further, reference numeral 8 is a focusing control device, which responds to the output (distance measurement result) signal of the distance measuring device 6 to control the CP.
U2 commands the focusing control device 8 to perform auto-focusing (automatic focusing), and in response to this command, the focusing control device 8 drives the optical system L2 via the drive system 9 of the focusing optical system L2. It is well known that auto focus is performed.

Reference numeral 10 is an exposure control device, and the CPU 2 instructs the exposure control device 10 to control the aperture corresponding to the aperture value in response to the output (photometry result) signal of the photometry device 7. The exposure control device 10 is a diaphragm member 11.
The exposure is controlled by driving and controlling.

Further, SW3 in FIG. 1 is a shake correction stop switch as a shake correction stop device provided on a part of the camera body so as to be externally operated, and this shake correction stop switch SW
For example, 3 is set so that it is turned on and maintained while the switch button is pressed and maintained in that state, and turned off when released. When the switch SW3 is on (closed state), the drive control of the shake correction device 4 based on the output signal of the shake detection device 1 is prohibited, and the shake correction operation is not performed.

Here, this shake correction stop switch SW3
Even if is turned on, the operation of the shake amount detection device 1 is not prohibited, and the shake amount may be continuously detected.
This is because even if the shake correction is prohibited by turning on the switch SW3, the shake amount detection has some time from the start to the detection.

Further, when the shake correction stop switch SW3 is operated, the state thereof may be displayed by the display unit 3 as a warning display device for displaying a warning by visual light emission, a blinking signal or the like.

Further, SW4 in the drawing is a strobe mode switch interlocked with a strobe mode setting button among the setting buttons for setting the photographing mode of the camera. This switch S
Each time W4 is pressed, the strobe mode is switched to the SB auto mode-light emission prohibition mode-slow sync mode. The mode set by the flash mode switch SW4, for example, SB
The auto mode and the slow sync mode of SB are set on the display device such as the display unit 3 or another display panel, and the states are set to "AOTO" and "SLO".
It is preferable that the display is turned on with "W" or the like.

2 and 3 are flowcharts for explaining the operation of the CPU 2 in FIG. 1, which will be described in order.

In FIG. 2, when the program starts, it is determined in S101 that the release button has been half pressed (switch SW1 is on). When the switch SW1 is on, the process proceeds to step S102, and when the switch SW1 is off, the process returns to step S101.

In step S102, a battery check is performed, and if a predetermined voltage is secured, step S102.
In step 103, it is determined whether the shake correction control stop switch SW3 is on or off. When the switch SW3 is off, the lamp display is not performed and the process proceeds to step S105. When the switch SW3 is on, step S1
Proceeding to 04, the lamp of the display unit 3 is made to blink at a frequency of 8 Hz.

In step S105, the shake amount detecting device 1 is activated, and in step S106, the distance measuring device 6 and the photometric device 7 are activated to perform distance measurement and photometry.

In step S107, it is checked whether or not the distance measurement result output from the distance measuring device 6 is closer than the focusing range Am. If it is closer than the focusing range Am, it is determined that focusing is impossible and step 108 is performed.
The lamp of the display unit 3 is turned off with. In step 109,
It is determined whether the release button is half-pressed (switch SW1 is on). When the switch SW1 is on, step S
Returning to step 108, when the switch SW1 is off, the process returns to step S101 to wait for the half-press operation to be redone.

If it is determined in step 107 that the distance measurement result is equal to or more than the focusing range Am, it is determined that focusing is possible, the process proceeds to step S110, and time counting is started. In step S111, the focusing control device 8 is instructed to perform the autofocus according to the distance measurement result, and the control device 8 moves the focusing optical system L2 to the focusing position via the drive system 9.

In step S112, it is determined whether or not the count time has reached a predetermined time, and the process waits until the predetermined time is reached. When the predetermined time is reached, it is determined in step S113 that the release button has been half-depressed (switch SW1 is on). When the switch SW1 is on, the process proceeds to step S114, and when the switch SW1 is off, the process returns to step S101 to wait for the half-press operation to be redone.

In step S114, it is detected whether or not the release button is fully pressed (switch SW2 is turned on). If switch SW2 is off, the process proceeds to step S115 to determine whether switch SW3 is turned on. When the switch SW3 is on, the lamp of the display unit 3 continues to blink at 8 Hz (step S116), and the process returns to step S113. When the switch SW3 is off, the lamp of the display unit 3 is turned off (step S117), and the shake amount detecting device 1
It is detected whether or not the shake amount detected by is smaller than the predetermined amount B (step S118).

At this time, the lamp of the display unit 3 is blinking at 8 Hz in step S104, and the shake amount is the predetermined amount B.
If it is less than the above, the process proceeds to step S119, the lamp of the display unit 3 is switched to the lighting state (second state), and the process returns to step S113. If the shake amount is greater than or equal to the predetermined amount B in step S118, step S1
After the lamp of the display unit 3 is made to blink at 2 Hz at 20, the process returns to step S113.

When the process returns from step S119 to step S113 and the release button is not fully pressed but half-pushing operation is still in progress, the process proceeds from step S113 to step S115 to step S115 and thereafter, and the detected shake is detected. When the amount is the predetermined amount B or more, step S12
In step 0, the lamp of the display unit 3 is switched from off to a blinking state of 2 Hz, and the process returns to step 113.

When the shake amount is less than the predetermined amount B, the display unit 3
When the photographer confirms that the lamp of the display unit 3 is lit and performs the full-press operation of the release button while the lamp is on, the step from step S114 is performed by full-press operation (switch SW2 is turned on). Proceed to S121, turn off the lamp of the display unit 3, and switch SW in step S122.
It is determined whether 3 is on.

When the switch SW3 is on, the process proceeds to step S204 in FIG. 3, centering of the shake correction lens group is performed, and the process proceeds to step S204 to start exposure, that is, photograph. When the switch SW3 is off, the process proceeds to step S201 in FIG. 3, centering of the shake correction lens group is performed, the shake correction drive is performed in step S202, and then exposure is started, that is, photographing is performed in step S203.

In step S203, the exposure control device 1 controls the aperture according to the output of the photometric device 7 (photometric result).
Command 0. In response to this command, the exposure control device 10 drives and controls the diaphragm member 11 to control the exposure according to the diaphragm value, and a photograph is taken.

Then, in step S205, it is determined whether or not the cutoff time set based on the above-described photometric result has come. If the cutoff time, which is the timing for closing the shutter, is reached, the flow advances to step 207 to perform exposure control. The exposure control device 10 is instructed to end the process, and step S208 is performed.
Then, the shake correction apparatus 4 is instructed to stop the shake correction. According to the command, the shake correction device 4 stops driving the drive system 5 and the shake correction operation is stopped. Further, step S20
At 9, the film winding mechanism (not shown) is driven to wind a frame of film, and the program ends.

If it is determined in step S205 that the cutoff time is not reached, the process advances to step S206 to determine whether the exposure is OK. If OK, the process advances to step S207, and if NO. Return to S205.

Tables 1 and 2 below show specific examples of the shutter closing timing in S205, which is the cutoff time. That is, when the focal length of the taking lens system is on the tele side (tele side), the following Table 1 is used.
It is good to do as shown in.

[0046]

[Table 1]

Here, since the focal length of the taking lens system is 105 mm on the telephoto side (telephoto side), the handshake limit shutter speed without the shake correction device is 1/105 second, and the VR off mode (shake correction off mode). In 1), 1/60 seconds, which is roughly close to this, is set as the cutoff time. Further, when the shake correction is ON, a value on the slow side of one step or more than this can be selected, and in this embodiment, a value of 1/15 seconds on the second step slow side is selected. Note that if the censoring time differs due to zooming, the flow of the subject changes if the subject moves, so it will be unnatural when shooting continuously while zooming and viewing the photos side by side. The same value is selected on the wide side, based on the value set in.

Further, when the focal length of the taking lens system is on the wide side (wide angle side) as a reference, it is preferable to set it as shown in Table 2 below.

[0049]

[Table 2]

That is, when the shake correction device has a higher capability than the example of Table 1 based on the telephoto side, the slow shutter is possible when the cutoff time is set to the wide side, and the night view shooting is further performed. It is effective.

That is, according to the present invention having the above-described configuration, the variable focus type photographing optical systems L1 and L2, the shake correction device 4 serving as a shake correction device and its drive system 5, the photometric device 6, and the stroboscopic light emission device are provided. In a provided camera, a CPU which is a control device for performing exposure photographing at a speed lower than at least one step with respect to a shutter speed determined by the reciprocal of the focal length
2 is configured so that the focal length serving as the reference of the shutter speed is set to the longest or shortest focal length, and the cutoff time during shooting is fixed regardless of zooming of the shooting optical systems L1 and L2.

According to such a structure, in the camera equipped with the shake correction device, since the shake does not occur even in the slow shutter, the background in the normal shooting or the flash shooting can be clearly shot, With respect to the shutter speed determined by the reciprocal of the focal length, a slow limit of the shutter speed is set so that shooting can be performed at least one step slower, and shooting in a dark place or a background can be performed well.

Here, in the above-described camera according to the present invention, at the time of taking a picture, it is possible to take a picture at least one step slower than the shutter speed determined by the reciprocal of the focal length. There is.

Further, the striking-off time during stroboscopic photography is configured so that photographing can be performed at a speed slower than at least one step with respect to the shutter speed determined by the reciprocal of the shutter speed, and the slow sync mode can be selectively switched. In some cases, it is possible to shoot at a slower speed by one step or more, compared with the above-mentioned cutoff time.

Further, according to such a structure, in shooting without using a strobe, a slow shutter is possible as compared with the conventional one, and therefore shooting in a darker place is possible. In addition, when using a flash, it is possible to take full advantage of the background light. Further, even in the slow sync mode, it is possible to shoot while making the most of the background.

Therefore, according to such a configuration, the effect of the shake correction device is not only to prevent the shake, but also the effect that the shooting range is expanded to a darker place, and a more natural photo taking the background light is taken. It will be possible. Furthermore, since the cutoff time is the same when shooting on the telephoto side and on the wide-angle side, there is also the advantage that you can obtain a natural picture even if you view the pictures taken while zooming.

It is needless to say that the present invention is not limited to the structure of the embodiment described above, and the shape and structure of the shake correction device and each part of the camera including the shake correction device can be appropriately modified or changed.

[0058]

As described above, according to the camera provided with the shake compensating device according to the present invention, it is equipped with the variable focus type photographing optical system, the shake compensating device, the photometric device, and the stroboscopic light emitting device, and the reciprocal of the focal length. With a control device that performs exposure shooting at a speed slower than at least one step relative to the shutter speed determined by, set the focal length, which is the reference of the shutter speed, to the longest or shortest focal length, regardless of zooming of the shooting optical system. Since the control is made so that the cutoff time is constant, the following excellent effects are obtained.

That is, according to the present invention, in the camera provided with the shake compensating device, since the shake does not occur even at the time of the slow shutter, the focal length is aimed to clearly show the background at the time of normal photographing or stroboscopic photographing. With respect to the shutter speed determined by the reciprocal of, the slow limit of the shutter speed is set so that shooting can be performed at least one step slower, and it is possible to shoot in a dark place or a background with good depiction.

In other words, according to the present invention, in shooting without using a strobe, a slow shutter is possible as compared with the prior art, so shooting in a darker place is possible. Further, according to the present invention, it is possible to take a photograph in which the background light is fully utilized when photographing with a strobe. Further, even in the slow sync mode, it is possible to shoot while making the most of the background.

Therefore, according to the present invention, the effect of the shake correction device is not only to prevent the shake, but also the effect that the shooting range is expanded to a darker place, and a more natural photo taking the background light is possible. The effect of becoming can be exhibited.

Further, in the present invention, since the cutoff time is the same on the telephoto side (tele side) and the wide angle side (wide side), it is natural to view the pictures taken while zooming the varifocal lens side by side. It has an excellent effect that is obtained.

[Brief description of drawings]

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

FIG. 2 is a flow chart for explaining a control operation by a CPU, showing an embodiment of a camera provided with a shake correction device according to the present invention.

FIG. 3 is a flowchart for explaining a control operation of the CPU following FIG.

[Explanation of symbols]

1 ... shake detection device, 2 ... CPU, 3 ... display unit,
4 ... shake correction device, 5 ... drive system, 6 ... distance measuring device,
7 Photometer, 8 Focusing controller, 9
Drive system, 10 Exposure control device, 11 Diaphragm member,
L1 ... Shooting optical system, L2 ... Focusing shooting optical system, L3 ... Shake correction optical system, SW1 ... Half-press switch, SW2 ... Full-press switch, SW3 ... Shake correction stop switch, SW4. Strobe mode switch.

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

Claims (2)

[Claims] 1. A variable-focus type photographing optical system which is zoomed to vary a focal length, a shake correction device which corrects a shake according to a shake condition from a shake detection device, and a photometric device which measures the brightness of an object. And a strobe light emitting device for performing selective flash photography, and a control device for performing exposure photography at a speed slower than at least one step relative to the shutter speed determined by the reciprocal of the focal length. The shake correction device is configured so that the reference focal length is set to the longest focal length and the cutoff time during shooting is controlled to be constant regardless of the zooming drive of the shooting optical system. camera. 2. A variable focus type photographing optical system which is zoomed to vary a focal length, a shake correction device which corrects a shake according to a shake condition from a shake detection device, and a photometric device which measures the brightness of an object. And a strobe light emitting device for performing selective flash photography, and a control device for performing exposure photography at a speed slower than at least one step relative to the shutter speed determined by the reciprocal of the focal length. The shake correction device is characterized in that the reference focal length is set to the shortest focal length, and the censoring time during shooting is controlled to be constant regardless of the zooming drive of the photographic optical system. camera.