JPH10319461A - Optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an excellent image on a restricted power supply condition by selecting a form that a shutter means is driven by smaller power when a correction means is used than when it is not used. SOLUTION: By making the curtain speed of a shutter low when a vibration- proof system is used, the power consumption of the shutter is restrained and made coexistent with shake correction driving. Namely, a signal 13a showing that the vibration-proof system 13 is used is inputted in a microcomputer 16 from the system 13 and photometric information 15a (shutter speed, etc.), is inputted in the microcomputer 16 from a photometric system 15, then the microcomputer 16 changes the driving form of the shutter blade of the shutter 14 based on them. In the case the system 13 is not used even when the shutter speed is low, the curtain speed is set to be the same as that when the shutter speed is high, and when the system 13 is used and the shutter speed is low, the curtain speed of the shutter 14 is made low. When the shutter speed is high, the curtain speed of the shutter is fixed to a high speed side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an optical apparatus having a correcting means for correcting image blur.

[0002]

2. Description of the Related Art In a current camera, all operations important for photographing, such as exposure determination and focusing, are automated, so that even an inexperienced person in camera operation is very unlikely to fail in photographing.

In recent years, a system for preventing a camera shake from being applied to a camera has been studied, and a factor which causes a photographer to fail in photographing has almost disappeared.

Here, a system for preventing camera shake will be briefly described.

The camera shake at the time of photographing is generally a vibration of 1 Hz to 12 Hz as a frequency. At the time of release of the shutter, even if such camera shake occurs, it is possible to take a picture without image shake. As a basic idea, it is necessary to detect the camera shake caused by the camera shake and to displace the correction lens according to the detected value. Therefore, in order to achieve a photograph that does not cause image shake even if camera shake occurs, first, it is necessary to accurately detect camera shake, and second, to correct optical axis change due to camera shake. Required.

In principle, this vibration (camera shake) is detected by a vibration detection sensor for detecting angular acceleration, angular velocity, angular displacement, and the like, and an output signal of the sensor is electrically or mechanically integrated. This can be achieved by mounting a camera shake detection circuit which outputs angular displacement on the camera. Then, by driving a shake correction device that decenters the photographing optical axis based on this detection information, image shake can be suppressed.

Here, an outline of an anti-vibration system having a vibration detection sensor and the like will be described with reference to FIG.

The example of FIG. 11 is a diagram of a system for suppressing an image blur caused by a camera vertical shake 81p and a horizontal shake 81y in a direction indicated by an arrow 81.

In the figure, reference numeral 82 denotes a lens barrel, 83p, 83
y is a vibration detection sensor that detects camera vertical vibration and camera horizontal vibration, respectively.
It is indicated by p, 84y. 85 is a shake correction system (87p,
87y are coils for applying thrust to the shake correction system 85, 8
Reference numerals 6p and 86y denote position detecting elements for detecting the position of the shake correction system 85. The shake correction system 85 is provided with a position control loop, which will be described later, and is driven by using the outputs of the vibration detection circuits 83p and 83y as target values. Thus, stability at the image plane 88 is ensured.

FIG. 12 to FIG. 14 are views showing a shake correcting apparatus used in the above-described anti-shake system. More specifically, FIG. 12 is a plan view as viewed from the front side of the shake correction apparatus (a view as viewed from the object side of the lens barrel 82 in FIG. 11), and FIG.
3 (a) is a side view seen from the direction of arrow A in FIG. 12, and FIG.
13B is a sectional view taken along line D1-D1 of FIG. 13, FIG. 13C is a sectional view taken along line D2-D2 of FIG. 12, and FIG. 14 is a rear view of FIG.

In these figures, reference numeral 71a designates a fitting frame provided at three places on the base plate 71, which is fitted into the inner periphery of the lens barrel 82 in FIG.
(See (a) and (b)). As shown in FIG. 12, shift coils 72p and 72y wound on a bobbin are fixed to the base plate 71.
Is fixed. Rotor 75
Is rotatably attached to the main plate 71 around its axis,
The rotor 75, the stator 74 and the lock coil 73 constitute a known step motor.

The base plate 71 has equally long slots 71c at three locations on its outer peripheral side surface (illustrated only in FIG. 13 (a), and its position is indicated by arrows in FIGS. 12 and 13 (c)). Is provided. A lock ring 76 (see FIG. 14) is attached to the rear surface of the main plate 71 so as to be rotatable around an arrow 76d.
The lock ring 76 is vibrated (rotated) around an arrow 76d in FIG. 14 by a stepping motor.

A support frame 77 for holding a correction lens (not shown) has a support shaft 77 extending into three equal parts in the radial direction of the outer periphery.
a of which the front end is fitted into the long hole 71 c of the main plate 71.

The three fitting portions are the same as the relationship between the elongated hole 71c and the support shaft 77a shown in FIG. 13 (a).
(See (a)), and are slidable in a direction perpendicular to the optical axis 70 (since the hole 71c is a long hole). In other words, the support frame 77 is restricted from moving in the optical axis direction with respect to the base plate 71, but can freely move in a vertical plane. When this moving direction is disassembled, FIG.
Are divided into a pitch direction 78p, a yaw direction 78y, and a roll direction 78r.

As shown in FIG. 12, a pin 77b of a support frame 77 is provided.
A pair of tension springs 79 is hung between the base plate pins 71b, and pulls the support frame 77 from both sides.
A shift yoke 711 on which a shift magnet 710 is adsorbed is attached to the support frame 77.
The first shift coils 72p and 72y are opposed to each other (see FIG. 13B).

The shift coil 7
When a current is passed through 2p, the support frame 77 is driven in the direction of arrow 78p against the elastic force of the tension spring 79, and when a current is passed through the shift coil 72y, the support frame 77 is moved in the direction of arrow 78y against the elastic force of the tension spring 79. Driven. Since no rotational driving force is generated in the roll direction 78r, and the support frame 77 is pulled from both sides by the tension spring 79 and is elastically restricted in this direction, the support frame 7 is not rotated.
7 does not rotate in this direction.

Now, based on the shake information from the shake detecting means for detecting the shake of the camera, the support frame 77 is moved by arrows 78p and 78p.
By driving in the y direction (by energizing the shift coils 72p and 72y), the image plane can be stabilized as described above. However, when the anti-vibration system is not used, the support frame 77 moves relative to the main plate 71. Need to be immobile. This is to prevent the support frame 77 from swinging due to disturbance vibrations when the mobile phone is carried, generating an impact sound between the support frame 77 and the base plate 71, and to avoid damage due to the impact noise.

FIG. 14 shows the state at this time (when the vibration isolating system is not used). Four projections 77 e of the support frame 77 are in contact with the inner peripheral wall 76 a of the lock ring 76. Therefore, the movement of the support frame 77 in the directions of the arrows 78p and 78y is restricted.

When using the anti-vibration system, the lock ring 76 is rotated by a predetermined amount clockwise in FIG. Then, the surface facing the projection 77e becomes the cam portion 76c, and the contact is separated from each other. Therefore,
The support frame 77 is free with respect to the lock ring 76, and can be driven in the directions of arrows 78p and 78y.

FIGS. 15 and 16 show the structure of a shutter device suitably used for exposing a film of a camera as an example of an optical apparatus.
FIG. 15 shows when the shutter blade is open (during exposure), and FIG. 16 shows when the shutter blade is closed (when not exposing).
3 is an exploded perspective view of FIG.

In these figures, the shaft 61 of the main plate 61
The shutter blades 62a and 62b are rotatably supported around the shafts a and 61b, respectively. Hole 62 of the long holes 62a ₁ and the shutter blades 62b of the shutter blade 62a
eccentric shaft 63 having a pin 63a which penetrates simultaneously into b ₁
The motor 64 on the cover 65 fixed to the main plate 61
(A movable magnet type motor in which a coil 64a is wound around the outer diameter and a magnet included therein rotates by passing a current through the coil 64a) and the eccentric shaft 63 is rotated by passing a current through the coil 64a.

The eccentric shaft 63 has a torsion coil spring 6 coaxially.
6 is provided to urge the eccentric shaft 63 in the direction of arrow 67. Therefore, as long as the rotational torque of the motor 64 is not applied to the eccentric shaft 63 (in a state where no current flows through the coil 64a), since the eccentric shaft 63 is rotating in the direction of the arrow 67, the pin 63a is moved by the shutter blade 62a _1. , 62b ₁ to bring the state of FIG. 16 (shutter closed).

In order to open the shutter (the state shown in FIG. 15),
The coil 64a may be energized (the motor 64 energizes in the direction in which the torque is generated in the direction opposite to the arrow 67) to rotate the eccentric shaft 63 against the torsion coil spring 66 in the direction opposite to the arrow 67.

[0024] Also, the relationship between the plurality of slits 62b ₂ and the photo-interrupter 68 provided on the shutter blades 62b, it is possible to detect the degree of opening of the shutter blade, by driving the motor 64 based on this output Thus, the opening amount and opening time of the shutter are controlled.

Here, the relationship between the energization of the coil 64a of the motor 64 and the opening of the shutter blade will be described with reference to FIG.

In FIG. 17, a bold line waveform 51 indicates the degree of opening of the shutter due to the movement of the shutter blades. Accordingly, it begins to open the shutter blades from the time t ₁ shown on the horizontal axis,
Maximum aperture, shutter begins to close at t ₃ at time t _2,
Comes to the shutter is completely closed at the time t _4.

The timing of this time point t ₁ is determined by the release operation of the photographer (pressing and releasing the release button of the camera), and the time from t ₁ to t ₄ (exposure time to the film) is determined by the brightness of the object and the film. It is determined by sensitivity or the like.

A bold line waveform 52 indicates the amount and direction of the current flowing through the coil 64a of the motor 64 to drive the shutter blades. The farther away from the center line 53, the greater the amount of current. In, the direction of current flow is reversed.

[0029] In the above, at time t ₁ to a large current to the coil 64a in order to the shutter blade opens driven. The reason why the large current is supplied is to increase the driving speed of the shutter blade. The energization of the coil 64a is actually performed a little faster, thereby accelerating the shutter blades. However, details are omitted in FIG. 17 to simplify the description.

When the shutter blades are completely opened at time t ₂ ,
The amount of electricity to the coil 64a is reduced. This is because, in this state, the motor 64 only needs to generate a force that keeps the shutter blade in the open state against the spring force of the torsion coil spring 66, so that the amount of electricity to the coil 64 is reduced and the power consumption is reduced. It is because it is suppressed.

[0031] At time t _3, an inverse current to the coil 64a for driving to close the shutter blade. Also at this time, a large current is supplied to increase the driving speed of the shutter blade.

When the shutter blades have been closed at time t ₄ ,
In this case, the power supply to the coil 64a is cut off.
ec) The energization of the coil 64a is continued (to prevent the shutter blades from rebounding).

After the shutter blade is closed, the closed state is maintained by the action of the torsion coil spring 66 without supplying power.

[0034]

Generally, the higher the speed of the shutter blade, the better. By increasing the speed, the exposure time can be shortened, the subject moving at high speed can be stopped (the locus due to the movement of the subject is not reflected), and shooting can be performed. This is because shooting is possible.

As described above, in order to increase the speed of the shutter blade, it is effective to reduce the driving friction, reduce the weight of the shutter blade, increase the performance of the motor, and increase the driving power. Therefore, power consumption tends to increase for high-performance shutter driving.

On the other hand, in recent cameras, miniaturization is regarded as important, and there is a tendency that the size of batteries used is reduced in order to realize the miniaturization. For this reason, the power consumption of the camera is becoming stricter.

Therefore, it is extremely difficult to simultaneously drive the shutter and the above-described shake correcting apparatus in the camera having the shake correcting apparatus shown in FIG. That is, while the energization of the coil 64a when the shutter is opened and closed and the energization of the coils 72p and 72y for vibration correction are overlapped (to prevent vibration during exposure), they are simultaneously driven. There was a risk that the power would exceed the capacity of the battery and none of the functions would work correctly.

(Object of the Invention) An object of the present invention is to provide an optical apparatus which can obtain a good image under a limited power supply condition.

[0039]

In order to achieve the above object, the present invention as defined in claims 1 to 4, comprises a correcting means for correcting image blur, a shutter means for controlling image recording, and
Even when the image recording time is the same, the optical apparatus includes a power control unit that changes the driving mode of the shutter unit when the correction unit is used and when it is not used.

In the above configuration, even if the image recording time is the same, the power consumption of the shutter means is changed by changing the moving speed of the shutter member.
When the correction means is used, a mode in which the shutter means is driven with lower power is selected as compared with when the correction means is not used, thereby coping with simultaneous driving of the correction means and the shutter means within a limited power supply condition. .

More specifically, when the correcting means is used, the shutter means is driven with a small power to drive the shutter means in a second driving mode in which the moving speed of the shutter member is reduced, and the non-use of the correcting means is performed. Occasionally, the shutter means is driven with a large power to drive the shutter means in a first drive mode in which the moving speed of the shutter member is increased. Further, when driving the shutter means in the second drive mode, the power for closing the shutter member is reduced.

According to another aspect of the present invention, there is provided a correcting means for correcting image shake, a first shutter means for controlling image recording, and a control means for controlling image recording. Second shutter means for driving with a lower electric power than the first shutter means, and the first shutter means and the second shutter when the correction means is used and not used. An optical apparatus having power control means for selecting one of the means.

In the above configuration, when the correcting means is used, the second shutter which is driven with lower power than the first shutter means.
Shutter means (means for reducing the power for closing the shutter blades as compared with the first shutter means, or the biasing force for closing and biasing the shutter blades as compared to the first shutter means) Means having a strong elastic member)
Is selected so as to cope with simultaneous driving of the correction unit and the shutter unit within a limited power supply condition.

According to another aspect of the present invention, there is provided a correction means for correcting image blur, a shutter means for controlling image recording, the correction means and the shutter means. In the case where the power consumption is performed simultaneously in each of the optical devices, the optical device has a power control unit that gives priority to the power supply to the correction unit.

In the above configuration, attention is paid to the fact that a slight deviation in shutter accuracy can be absorbed by the performance of the recording medium, and when the sum of the power consumption of the correction means and the power consumption of the shutter means exceeds a predetermined amount. Is designed to cope with simultaneous driving of the correction unit and the shutter unit under limited power supply conditions by reducing the power supply to the shutter unit. When the electric power supplied to the shutter unit becomes equal to or less than a predetermined amount, even if the image is slightly shaken, the power supplied to the correcting unit is prevented in order to prevent the image recording itself from being damaged. We are trying to reduce power as well.

According to another aspect of the present invention, there is provided a correction means for correcting an image blur, and a method for correcting an image blur within a power condition during image recording from a state of a shake applied to the optical apparatus. If it is anticipated that a state in which the correction unit cannot function properly during image recording is expected, an optical device having a power control unit that changes the control of the correction unit during image recording is to be used. .

In the above configuration, if it is expected that the correction means cannot function properly during image recording under the power condition during image recording, it is prevented that the image recording is adversely affected. For this reason, the operation of the correction means is stopped during image recording. Then, when it is determined that the correction means is in a state in which it can function properly, the correction means is operated to enable proper image recording.

According to another aspect of the present invention, there is provided a correction means for correcting image shake, a first shutter means for controlling image recording, and a control means for controlling image recording. The second shutter means, which is driven with lower power than the first shutter means, and when the use of the first shutter means is selected and when the use of the second shutter means is selected. And an electric device having power control means for controlling the correction means.

In the above configuration, when the use of the first shutter means driven by a large power is selected, it is difficult to simultaneously drive the correction means and the first shutter means within a limited power supply condition. Therefore, when the correction means is deactivated and the use of the second shutter means which is driven with lower power than the first shutter means is selected, the correction means and the second shutter means Since simultaneous driving is permissible, the correcting means is set in the operating state so that image recording without vibration can be performed.

[0050]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

As described above, the driving of the shutter blade (shutter curtain) having a high curtain speed is effective when the shutter speed is high. However, when the shutter speed is fast,
For example, in a short exposure period such as 1/125 second or 1/250 second, image deterioration due to camera shake during the exposure period hardly matters. Therefore, in such a case, the anti-vibration system is not needed.

The situation where a vibration isolation system is required, that is, 1 /
In a long exposure period such as 8 seconds or 1/15 second, it is not necessary to increase the shutter curtain speed.

By paying attention to this point, when the image stabilizing system is used, the shutter curtain speed is reduced, the power consumption of the shutter can be suppressed, and coexistence with the shake correction drive can be achieved.

In the embodiment of the present invention described below, the shutter speed of the shutter blade is switched between when the shutter speed is high and when the shutter speed is low (the driving mode of the shutter blade is switched according to the shutter speed). Instead, even when the shutter speed is low, the shutter speed is the same as when the shutter speed is high when the anti-vibration system is not used, and when the anti-vibration system is used and the shutter speed is low, the shutter curtain speed is reduced. (When the shutter speed is high, the shutter curtain speed is fixed to the high speed side, and in this case, the image stabilizing system may be forcibly turned off.)

This is because, even at the same shutter speed (effective exposure time), the depth of field differs depending on the curtain speed of the shutter blades, resulting in a difference in the image obtained. For example, when the effective exposure time is 1/15 second, the shutter is at the maximum aperture when the shutter curtain speed is slow (when the vibration proof system is used) and when the shutter curtain speed is fast (when the vibration proof system is not used). Due to the different time, blurring of the obtained background photo will be different. Therefore, when the shutter speed is slow, the photographer can select the shutter curtain speed (selecting whether the anti-shake system is used or not) instead of uniformly reducing the shutter curtain speed, so that the photographer can select a desired image. Can be obtained.

The thick line 11 in FIG. 1 represents the amount of opening of the shutter when the image stabilizing system is used, and the thick line 12 represents the amount of current flowing through the shutter at that time. Also, a thin line 51
Represents the opening amount of the shutter when the anti-vibration system is not used, and the thin line 52 represents the amount of current to the coil 64a at that time.

FIG. 2 is a block diagram showing the main configuration of the camera according to the first embodiment of the present invention. The case where the driving mode of the shutter blade is switched as described above will be described with reference to FIG. The microcomputer 16 sends a signal 13a indicating that the image stabilization system is used (is used) from the image stabilization system 13 having the image stabilizing device illustrated in FIG.
And photometric information 15a (such as shutter speed) are input from the photometric system 15 and the microcomputer 1
6 outputs to the shutter 14 a signal 14a for changing the driving mode of the shutter blades of the shutter 14.

More specifically, when the microcomputer 16 increases the shutter speed (such as 1/250 second) in accordance with the photometric information 15a from the photometric system 15, the microcomputer 14 switches the shutter 14 to a driving mode in which the shutter blade curtain speed is increased. or,
When the shutter speed is reduced according to the photometric information 15a from the photometric system 15 (for example, 1/15 second), the signal 1 indicating that the anti-vibration system is used from the anti-vibration system 13.
If 3a is input, the drive mode is switched to the shutter 14 to reduce the curtain speed of the shutter blades. Similarly, if the signal 13a indicating that the anti-vibration system is not used is input even when the shutter speed is low, the shutter 14 The drive mode is switched to a drive mode in which the shutter blade curtain speed of No. 14 is increased.

The difference between the thick line 11 and the thin line 51 in FIG. 1 lies in the shutter closing drive from time t ₃ to time t _4.
Reference numeral 1 indicates that the shutter is closed more gently than the thin line 51.
The coil current at the time of closing drive is smaller for the thick wire 12 than for the thin wire 52. Therefore, since the current consumption during the shutter closing drive is reduced, a sufficient power margin for performing the shake correction is generated at this time, and it is possible to achieve both the shutter drive and the shake correction.

Since the lens shutter used in the camera has the structure described with reference to FIGS. 15 and 16, the opening amount when the shutter is opened and closed changes with time. The exposure time when such an aperture change is performed is generally determined by the time from when the shutter blade reaches about half of the maximum aperture at the time of photographing to when the shutter blade returns to about half the same (effective exposure time). . In FIG. 1, t ₅ is the effective time.

The bold line 11 and the thin line 51 in FIG. 1 have the same effective exposure time, but the bold line 11 has a lower shutter closing curtain speed. That is, in the lens shutter, the shutter curtain speed can be changed within the same effective exposure time (same shutter speed), so that the shutter drive and shake correction can be separated as in this embodiment.

In FIG. 1, the shutter is opened (time t _1).
~t ₂ curtain speed of) is not changed by the thick lines 11 and thin lines and 51. This will be described.

A change in the power supply state during the shake correction causes a malfunction in the shake correction, and the malfunction is particularly large in the initial stage of the change in the power supply state. 17 described above, results in a large shake correction malfunction immediately after time t ₁ immediately and the time t _3.

By the way, even if the shake correction malfunction occurs immediately after the time point t ₁ , even if the shake correction malfunction occurs at this time because the shutter blades are not sufficiently opened (insufficient exposure), this is not the case. Does not greatly affect However, at time t
₃ Immediately after the shake correction malfunction, the film surface is greatly affected. This is because the shutter blades are fully opened at this time. Therefore, the fluctuation of the power supply when the shutter is closed has a greater effect on the shake correction than the fluctuation of the power supply when the shutter is opened.

In FIG. 1, the reason why the current consumption is reduced by lowering only the shutter speed of closing the shutter is as described above.

Of course, if the shutter speed for opening the shutter is also slowed, the accuracy of the shake correction can be further increased. If the shutter opening (the same effective exposure time as the conventional opening 51) as shown by the thick line 17 in FIG. Since the amount of current 18 to the coil 64a can be reduced even when the shutter is opened, it is also possible to prevent the image from being deteriorated due to the shake correction malfunction at this time.

As described above, in the camera having the image stabilizing system, even when the drive control mode of the shutter for controlling the exposure to the film has the same effective exposure time, it differs between when the image stabilizing system is used and when it is not used. When the image stabilizing system is used, at least when the shutter is closed, a small electric power (coil 6
4a) to drive the shutter blades.

Accordingly, the shutter drive and the shake correction can be achieved at the same time within a limited power supply condition, and a good image can be obtained.

The above is an embodiment in which the shutter drive mode is changed when the image stabilizing system is turned on and when it is not. However, on the contrary, the photographer can select the shutter drive mode. The anti-vibration system may be automatically turned on and off.

As described above, when the shutter curtain speed is low, the depth of field becomes deeper even at the same effective exposure time than when the shutter curtain speed is high, and both the subject and the background are in focus.
Also, when the shutter curtain speed is high, the depth of field becomes shallow even with the same effective exposure time, so that the background is blurred and the photograph can be emphasized.

It is convenient if the photographer can select the above two conditions according to the shooting conditions. When the shutter curtain speed is low, the shake correction automatically works, and an image without shake can be obtained.
When the shutter curtain speed is high, the fact that the shake correction does not work may be displayed to the photographer, and the photographer should be careful to take a picture.

As described above, in the camera having the image stabilizing system, a plurality of shutter driving modes can be selected even within the same exposure time, and the shutter driving and the shake correction can be performed by controlling the image stabilizing system. Compatible within limited power supply conditions.

(Second Embodiment) As described above, the most severe coexistence of the power for shake correction and the power for driving the shutter is when the shutter blade is closed.

In the first embodiment, the current for driving the shutter blades to close is reduced (the shutter curtain speed is reduced correspondingly) to achieve both power consumption with the shake correction device. As another method, there is a method in which the shutter blade is driven to close without energizing the motor coil of the shutter, and the shutter curtain speed at this time is not reduced. This will be described below as a second embodiment of the present invention.

FIG. 4 is a block diagram showing a main part of a camera according to the second embodiment of the present invention. The difference from FIG. 2 is that two shutters are provided.

As in the first embodiment, the microcomputer 16 receives signals 13a and 15a from the image stabilizing system 13 and the photometry system 15, and outputs signals when the subject is bright (when the shutter speed is high). A shutter 14 (a shutter having a high curtain speed of the shutter blades and a driving style shown in FIG. 17) is used without using a vibration isolation system.

Even when the subject is dark (when the shutter speed decreases), the shutter 14 is used when the image stabilizing system is not used.

On the other hand, when the subject is dark and the anti-shake system is used, the microcomputer 16 selects the shutter 19. This shutter 19 is exactly the same as the shutter described with reference to FIGS. However, the shutter blade closing biasing force of the torsion coil spring 66 is replaced by a spring stronger than the shutter 14.

The driving method of the shutter 19 will be described with reference to FIG.

In FIG. 5, the thick line 21 indicates the opening of the shutter blades of the shutter 19, the thin line 51 indicates the opening of the shutter 14, and the thick lines 22 and 52 indicate the amount of current supplied to the coil 64a at that time.

In the shutter opening drive from the time point t ₁ to the time point t ₂ , the shutter 19 is slower than the shutter 14 (the energizing time to the coil 64 a is longer). This is because the closing spring of the torsion coil spring 66 is strengthened, and the shutter is opened against it. However, as described above, the shake correction malfunction due to the power condition occurs immediately after the time points t ₁ and t _3. occurs when the power requirements varies greatly as a, then since there is no mean malfunction continues for a long time, the shutter Hiraku Hane drive time (time t ₂ from time t ₁₎ is not longer than the shutter 14 The shake correction malfunction amount does not change.

Further, as described above, since the opening amount of the shutter blade immediately after the time point t ₁ is small, the image deterioration due to the shake correction malfunction at this time does not matter.

In the shutter closing drive from time t ₃ , the shutter 19 stops energizing the coil 64 a (the shutter 14 energizes the coil 64 a in reverse).

However, as can be seen from FIG. 5, the shutter 14 and the shutter 19 have the same shutter blade closing drive curtain speed. This is because the shutter 19 has a strong force of the biasing spring of the torsion coil spring in the shutter blade closing direction.

Therefore, when the shutter 19 is used, the power is saved even with the same effective exposure time as compared with when the shutter 14 is used, and it is possible to achieve both the power consumption due to the shake correction.

When the anti-vibration system is not used, the shutter 1
The reason for using 4 is that the shutter blade has a high shutter speed (shutter opening drive shutter speed), so that it can cope with a higher shutter speed. This is because the shutter can be made longer than the shutter 19, so that the depth of field can be made shallow and the blurred background can be taken.

As described above, a camera having an anti-vibration system has a plurality of shutters for controlling exposure to a film, and can be selectively used depending on whether or not the anti-vibration system is used. By selecting a strong shutter, the current consumption when closing the shutter was reduced (eliminated), and power consumption by shake correction was compatible with limited power supply conditions.

(Third Embodiment) In the case where it is impossible to achieve both shake correction and shutter driving due to power supply restrictions, the first and second embodiments of the present invention use the same effective exposure (within the same exposure) as the shutter driving mode. Alternatively, the power consumption of the shutter is suppressed by changing the shutter itself, thereby achieving compatibility with shake correction.

The reason why the power consumption of the shutter is suppressed without suppressing the power consumption of the shake correction is that, in the case of the shutter, even if the power consumption is suppressed, the exposure variation can be changed by devising the driving style (changing the driving timing). On the other hand, if drive power for shake correction is insufficient, appropriate shake correction cannot be performed, and image deterioration occurs in accordance with the power shortage.

Further, in the case of the shutter, considering that a slight exposure variation due to a change in the opening time of the shutter can be covered by the latitude of the film (can be corrected at the time of printing), the shutter is required to be compatible with shake correction. It is an effective method to reduce the power consumption.

The third embodiment is a further simplification of the first and second embodiments. When the shake correction is performed, the power consumption of the shutter drive is suppressed. No special measures have been taken when. This causes some variation in the exposure to the film, which is covered by the latitude of the film.

When the power consumption of the shutter is suppressed as described above, the shutter speed is slowed, so that the effective exposure time is increased for a certain period of time. However, the exposure time is slightly increased at a slow shutter speed such as when using an image stabilizing system. Even so, the effect on exposure is not so significant.

If the same amount of exposure time is added at a high shutter speed, the effect on the exposure is serious. However, at such a high shutter speed, the consumption of the shutter is reduced because no anti-vibration system is required. There is no need to reduce power.

FIG. 6 is a block diagram showing a main part of a camera according to the third embodiment of the present invention. The power consumption of the shake correction device 31 and the shutter 14 having the structure shown in FIG. The power consumption detection circuit 32 simply detects the power, and sends the information to the microcomputer 16, and the microcomputer 16 controls the power supply to the shake correction device 31 and the shutter 14 based on the information.

FIG. 7 is a flowchart showing the operation of the main part in the microcomputer 16 in the configuration of FIG.
This flow starts at the time of exposure (when shake correction and shutter drive are performed simultaneously), and is stopped at the end of exposure.

At step # 3001, the shutter drive power Ps and the shake correction device 3
1 drive power Pc is input. Next step # 3002
Then, the sum of the power consumptions of the two, ie, “Ps + Pc”, is compared with the upper limit Po of the power supply, and when the sum is within the upper limit Po of the power supply, the process returns to step # 3001 and exceeds the upper limit Po of the power supply. At this time, the process proceeds to step # 3003.

As described above, when the total power of both powers exceeds the upper limit Po of the power supply, the power supply to the shutter is suppressed as described above, so that the total power falls within the upper limit Po of the power supply. However, if the power supply to the shutter becomes too small, for example, “Ps + Pc” is too large (Pmax
If the power supply to the shutter is greatly reduced to make the upper limit Po of the power supply, the shutter curtain speed becomes extremely slow, and the change in exposure cannot be absorbed by the latitude of the film. Therefore, the lower limit value Ps ₁ of the power supply to the shutter provided in order to avoid this.

In step # 3003, the sum of the two balances is compared with the above-mentioned Pmax.
If not, go to step # 3005.

When the process proceeds to step # 3004, the power consumption of the shake correction and the shutter drive is too large to catch up with merely reducing the power supply of the shutter. (If the shutter is driven at a lower power, the exposure to the film becomes excessive. Become
The following steps #
At 3006, the power supply to the shutter kept the lower limit Ps _1, are to be supplemented by that reducing the power supply of the remaining power shake correction driving.

[0100] Therefore, in step # 3004, to secure the power supply to the shutter to the lower limit value Ps _1, the next step # 3006, obtains the power supply of the shake correction as Pc = Po-Ps _1, both the sum of the Does not exceed the power supply upper limit Po.

At this time, the exposure to the film is slightly inappropriate, but this amount is an amount that can be absorbed by the latitude of the film, and the shake correction is slightly inappropriate due to the reduced power supply (shake correction). However, the fact that a large amount of power is required for shutter drive and shake correction is when a considerable shake occurs. In this case, even if the shake correction is slightly insufficient, sufficient prevention is required. It can be said that the swing function has been achieved.

"Ps + Pc" is Pmax and the upper limit P
When the shutter drive and the shake correction are performed in steps # 3003 to # 3005, the shutter drive and the shake correction can both be achieved by simply reducing the drive power of the shutter, and Ps = Po−Pc. The drive power of the shutter is reduced by the amount that the total power exceeds the power supply upper limit Po, and the process returns to step # 3001.

As described above, in a camera having a shake correcting device for correcting a shake and a shutter for controlling exposure of a film, when the power consumption of the shake correcting device and the power consumption of the shutter coexist, the shake correcting device is used. When the total power consumption exceeds a predetermined value,
Reduce the power supply to the shutter (shake cannot be corrected after shooting, but some exposure fluctuations can be corrected after shooting).
If the power supply to the shutter is reduced by more than a predetermined value at this time, the effective exposure time to the shutter exceeds the latitude range of the film. Since the correction is made by reducing the power supply to the apparatus, the shake correction and the shutter drive can coexist properly.

(Fourth Embodiment) The shake correcting device needs a driving force against the spring force of the tension spring 79 because of the structure described with reference to FIGS. And That is, a large amount of power is required to correct a large shake.

In other words, when correcting a small shake (a large shake does not normally occur when the camera is firmly held), the shake correction device is driven with a small amount of power. It is possible to achieve both.

The fourth embodiment of the present invention pays attention to this point, and the shake correction device does not function properly (cannot be driven with low power) from the state of the power supply in the use state of the camera and the state of the shake applied to the camera. When it is anticipated, shake correction is not performed during exposure, or shake correction is started after returning to a state of functioning properly.

FIG. 8 is a block diagram showing a main part of a camera according to a fourth embodiment of the present invention. The microcomputer 16 of the camera includes a camera shake detecting device 41 for detecting camera shake, and a release button. Exposure operation member 4 at a certain location
2. Signals from the shutter 14, the shake correction device 31 are input.

FIG. 9 is a flowchart showing the operation of the main part in the microcomputer 16 in the configuration of FIG.
This flow is when the main switch of the camera is turned on or
The operation starts when the exposure operation member 42 is half-pressed.

In step # 4001, the process waits until the exposure operation member 42 is pushed and released (hereinafter, referred to as a sw2 operation) for exposure. When the sw2 operation is performed by the exposure operation unit 42, the process proceeds to step # 4002, where the magnitude a of the shake signal from the camera shake detection device 41 is input.

[0110] In the next step # 4003, and inputs the reference a ₀ to be compared with the magnitude a of the vibration signal. Note that a ₀ is variable in the power supply state. When the power is sufficient, a ₀ is large, and when the power is small, a ₀ is small.

[0111] In step # 4004, performs the above comparison of a and a _0, "a> a _0", i.e., deflection current from a ₀ indicating the magnitude of the vibration can shake correction in allowable power determined by the power status If the size a is large, the process immediately proceeds to step # 4006. That is, (because it can not achieve both of the shake correction and shutter drive) Since the size a in this case deflection is greater than a _0, the blur correction will be not performed. If “a ≦ a ₀ ”, step # 4
Proceed to 005 to start shake correction.

In step # 4006, the shutter is opened to start exposure, and then in step # 4007, a timer T for measuring the exposure time is started. Then, in step # 4008, the palliative until the count of the timer T is proper exposure value T _0. Thereafter, the count of the timer T is proper exposure value T ₀ when the shutter is closed the program proceeds to step # 4009. Then, the next step # 40
At 10, it is determined whether or not the shake correction has been performed.
If the shake correction has been performed, the shake correction is stopped in step # 4011, and the process returns to step # 4001. If the shake correction has not been performed in step # 4010, the process directly returns to step # 4001.

With the above configuration, when the power is exhausted and the shake is corrected when the shake is large, it is possible to prevent improper shutter operation or stop the shutter from operating. Can be prevented.

(Fifth Embodiment) FIG. 10 is a flowchart showing an operation of a main part of a camera according to a fifth embodiment of the present invention.

In the fifth embodiment, even during exposure,
If the magnitude a of the shake is smaller than a ₀ , this shows an example in which the shake correction which has not been performed (because “a> a ₀ ”) is started, and the difference from FIG.
7 is that steps # 4012 to # 4014 are added between step # 7 and step # 4008 (timer count loop during exposure).

In step # 4012, step # 40
10, whether the shake correction is currently performed (“a
> A _0, no shake correction has been performed and “a ≦ a
₀ ", it is determined that the shake correction has been performed. If the shake correction has been performed, the process proceeds to step # 4008,
If the shake correction has not been performed, the process proceeds to step # 4013.

In step # 4013, step # 40
Similar to 03, (the magnitude of the deflection at this point, deflection of the magnitude a is input at step # 4002 is updated) magnitude a of the deflection as compared with the reference a _0. Here, when “a ≦ a ₀ ” (when the shake is smaller than that determined in step # 4004), the process proceeds to step # 4014, shake correction is started, and “a> a”
_If " ₀ ", the process proceeds to step # 4008. The above loop is repeated until the count of the timer T reaches T ₀ , and the shake correction is started when the shake becomes small.

With such a configuration, the shake cannot be corrected at first because the shake cannot be corrected, so that the shake correction can be started, and a good image can be obtained.

In the fourth and fifth embodiments described above, in a camera having a shake correction device for correcting a shake, the shake correction device functions properly during exposure under power conditions from the state of the shake applied to the camera. If it is anticipated that such a state will not occur, the control of the shake correction apparatus is changed during the exposure. For details, do not perform shake correction during exposure, or
By starting image stabilization after waiting for the image stabilization device to function properly, it is possible to achieve both image stabilization and shutter driving during normal shooting, and switch to shutter driving even when power consumption suddenly increases. Can be eliminated.

In each of the above embodiments, attention is paid to the situation where the image stabilization system is used, for example, the fact that the high-speed shutter is not used when the subject is dark. It is used properly by the device.

More specifically, the shutter drive control mode for controlling the exposure of the film, in particular, even when the drive power is the same as the effective exposure time of the shutter, is made different between when the anti-shake system is used and when it is not used (the anti-shake system is used). When the vibration system is used, the shutter is driven with low power, and in particular, the amount of power used when closing the shutter is reduced), so that a good image can be obtained under a limited power supply condition.

Further, a plurality of shutters for controlling the exposure of the film are provided, and different shutters are selected between when the anti-vibration system is used and when the anti-vibration system is not used. In particular, when the anti-vibration system is used, the shutter blades are closed with low power consumption. Since a shutter (a shutter having a strong biasing force of a spring that closes and biases the shutter blades) is selected, a good image can be obtained under a limited power supply condition.

Although a slight deviation in shutter accuracy can be absorbed in the latitude range of the film, image deterioration occurs due to insufficient operation of the shake correction or malfunction of the shake correction device due to fluctuations in power conditions. In the case of taking into account that it cannot be corrected at the time of printing etc., at the time of exposure, slight malfunction of the shutter is allowed and priority is given to shake correction, and when power consumption of the shake correction device and power consumption of the shutter coexist Priority is given to power supply to the shake correction device. Specifically, the sum of the power consumption of the shake correction device and the power consumption of the shutter is a predetermined value (the power required to continue normal driving of the camera). When it exceeds, the power supply to the shutter is reduced.

However, if the amount of reduction is greater than a predetermined value, malfunction of the shutter cannot be tolerated, and the power exceeds the latitude of the film, so that the power is not further reduced and the power supplied to the shake correction device is reduced. I have to.

Focusing on the fact that the power consumption of the shake correction device during exposure can be predicted from the shake state, the state in which the shake correction device does not function properly within the specified power condition during the exposure from the shake state If it is anticipated that the correction can be made, the control of the shake correction device is changed during the exposure. Specifically, when the power consumption of the shake correction device exceeds the power consumption during exposure due to the state of shake, do not move the shake correction device during exposure,
Alternatively, the configuration is such that the shake correction is started when the power consumption of the shake correction apparatus during exposure is reduced (when the shake is reduced).

A plurality of shutter drive modes can be selected even with the same effective exposure time, and the anti-shake system is controlled by selecting the shutter drive mode. Specifically, when a shutter drive mode with low power consumption (slow shutter curtain speed) is selected, shake correction is performed, and when a shutter drive mode with high power consumption (fast shutter curtain speed) is selected, shake correction is performed. In this way, malfunctions due to coexistence of a shutter that consumes a large amount of power and shake correction are prevented.

(Correspondence between the Invention and the Embodiment) In each of the above-described embodiments, the image stabilizing device in the image stabilizing system 13,
The shake correcting device 31 includes the shutter 14
Corresponds to the shutter means and the first shutter means, and the shutter 19 corresponds to the second shutter means of the present invention.
Correspond to the power control means of the present invention.

The correspondence between the components of the embodiment and the components of the present invention has been described above. However, the present invention is not limited to the configuration of the embodiment, and the functions and features described in the claims are not limited.
Needless to say, any configuration may be used as long as the functions of the embodiment can be achieved.

(Modification) The present invention is applicable not only to a silver halide camera but also to an electronic still camera and a video camera. Furthermore, the present invention can be applied to an optical apparatus or other device having a vibration-proof function and a shutter, and also to a constituent unit.

The invention described in each claim or the configuration of each embodiment may be such as to form one device as a whole, or may be separated or combined with another device. Or as an element constituting the device.

Although a film is used as a recording medium, any other image recording medium can be used.

Further, according to the present invention, as a shake correcting means, a luminous flux changing means such as a cyst optical system for moving an optical member in a plane perpendicular to the optical axis, a variable apex prism, etc. Any object may be used as long as it can prevent shake, such as a device that moves a surface, and a device that corrects shake by image processing.

Further, the present invention may have a configuration in which the above embodiments or their techniques are appropriately combined.

[0134]

As described above, according to the present invention,
Focusing on the fact that the power consumption of the shutter means is different by changing the moving speed of the shutter member even during the same image recording time, the shutter means has a lower power consumption when the correction means is used than when not used. Since the driving mode is selected, it is possible to provide an optical device that can obtain a good image under limited power supply conditions.

Further, according to the present invention, when the correction means is used, the second shutter means which is driven with lower electric power than the first shutter means is selected. It is possible to provide an optical device capable of obtaining a good image.

Also, according to the present invention, attention is paid to the fact that a slight deviation in shutter accuracy can be absorbed by the performance of the recording medium.
When the sum of the power consumption of the correction means and the power consumption of the shutter means exceeds a predetermined amount, the power supply to the shutter means is reduced, so that a good image can be obtained under a limited power supply condition. An optical device that can be obtained can be provided.

Further, according to the present invention, if it is expected that the correction means cannot function properly during image recording within the power condition during image recording, the image recording will be adversely affected. Since the operation of the correction unit is stopped during image recording, it is possible to provide an optical device capable of obtaining a good image under a limited power supply condition.

Further, according to the present invention, when the use of the first shutter means driven by high power is selected, the correction means and the first shutter means in a limited power supply condition are selected. Since simultaneous driving is difficult, when the correction means is deactivated and the use of the second shutter means, which is driven with lower power than the first shutter means, is selected, the correction means and the second shutter means are used. Since the simultaneous driving of the shutter means can be tolerated, the correction means is set to the operating state so that image recording without vibration can be performed. It can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between opening and closing of a shutter of a camera according to a first embodiment of the present invention and a coil current for driving a shutter.

FIG. 2 is a block diagram illustrating a main configuration of a camera according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating another example of the relationship between the opening and closing of the shutter of the camera and the coil current for driving the shutter according to the first embodiment of the present invention.

FIG. 4 is a block diagram illustrating a main configuration of a camera according to a second embodiment of the present invention.

FIG. 5 is a diagram illustrating a relationship between opening and closing of a shutter of a camera and a coil current for driving a shutter according to a second embodiment of the present invention.

FIG. 6 is a block diagram illustrating a main configuration of a camera according to a third embodiment of the present invention.

FIG. 7 is a flowchart showing an operation of a main part of the microcomputer of FIG. 6;

FIG. 8 is a block diagram showing a main configuration of a camera according to a fourth embodiment of the present invention.

FIG. 9 is a flowchart showing an operation of a main part of the microcomputer of FIG. 8;

FIG. 10 is a flowchart showing an operation of a main part of a camera according to a fifth embodiment of the present invention.

FIG. 11 is a perspective view showing a configuration of a conventional vibration isolation system.

FIG. 12 is a front view of a shake correction device provided in the vibration isolation system of FIG. 11;

13 is a side view as viewed from the direction of arrow A in FIG.
It is a figure which shows D1, D2-D2 cross section.

14 is a back view of the shake correction apparatus of FIG.

FIG. 15 is an exploded perspective view of a conventional shutter.

FIG. 16 is an exploded perspective view showing a state where shutter blades are closed from the state of FIG.

17 is a diagram showing the relationship between the opening and closing of the shutter shown in FIG. 15 and the coil current for driving the shutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Anti-vibration system 14, 19 Shutter 15 Photometry system 16 Microcomputer 31 Shake correction device 32 Power consumption detection circuit 41 Camera shake detection device 42 Exposure operation member

Claims (17)

[Claims] 1. A correcting means for correcting image shake, a shutter means for controlling image recording, and a shutter which is used when the correcting means is used and when the correcting means is not used even during the same image recording time. And an electric power control unit for changing a driving mode of the unit. 2. The optical apparatus according to claim 1, wherein the power control unit selects a mode of driving the shutter unit with lower power when the correction unit is used than when the correction unit is not used. 3. The driving mode includes a first driving mode in which the shutter means is driven with high power to increase the moving speed of the shutter member, and a shutter member in which the shutter means is driven with low power. The power control means drives the shutter means in the second drive style when the correction means is used, and the power control means drives the shutter means in the second drive style when the correction means is not used. 3. An optical apparatus according to claim 2, wherein said shutter means is driven in said first driving mode. 4. The optical apparatus according to claim 3, wherein the power control means reduces power for closing the shutter blade when driving the shutter means in the second drive mode. . 5. A correcting means for correcting image blur, a first shutter means for controlling image recording, and a driving means for controlling image recording, which is driven with lower electric power than the first shutter means. A second shutter unit; and a power control unit for selecting either the first shutter unit or the second shutter unit when the correction unit is used or not used. Optical equipment. 6. The optical apparatus according to claim 5, wherein said power control means selects said second shutter means when using said correction means. 7. An optical apparatus according to claim 3, wherein said second shutter means reduces electric power for closing said shutter member as compared with said first shutter means. 8. The apparatus according to claim 1, wherein said second shutter means has an elastic member having a stronger urging force for closing and urging said shutter blade than said first shutter means. Item 7. The optical device according to Item 6. 9. A correction means for correcting image shake, a shutter means for controlling image recording, and a power supply means for controlling said correction means when power consumption is simultaneously performed in each of said correction means and said shutter means. An optical apparatus comprising: a power control unit that gives priority to power supply. 10. The power control means reduces power supply to the shutter means when the sum of the power consumption of the correction means and the power consumption of the shutter means exceeds a predetermined amount. The optical device according to claim 9. 11. The power control unit according to claim 1, wherein the power supply to the correction unit is reduced when the power supply to the shutter unit becomes equal to or less than a predetermined amount.
The optical apparatus according to 0. 12. The power control unit according to claim 6, wherein when the power supplied to said shutter unit is equal to or less than a predetermined amount and the effective image recording time exceeds a latitude range on an image recording medium,
12. The optical apparatus according to claim 11, wherein power supplied to the correction unit is reduced. 13. A correcting means for correcting image shake, and a state in which said correcting means cannot function properly during image recording under power conditions during image recording from a state of a shake applied to said optical device. An optical apparatus, comprising: a power control unit that changes the control of the correction unit during image recording when expected. 14. The image forming apparatus according to claim 1, wherein the power control unit is configured to execute the correction unit during the image recording when it is expected that the correction unit cannot function properly during the image recording within the power condition during the image recording. 14. The optical device according to claim 13, wherein the operation of the optical device is stopped. 15. The optical apparatus according to claim 14, wherein the power control unit activates the correction unit by determining that the correction unit is in a state where the correction unit can function properly. 16. A correction means for correcting image shake, a first shutter means for controlling image recording, and a drive means for controlling image recording, which is driven with lower electric power than the first shutter means. A second shutter means, and a power control means for controlling the correction means when the use of the first shutter means is selected and when the use of the second shutter means is selected. An optical device characterized by that: 17. The power control unit, when the use of the first shutter unit is selected, deactivates the correction unit, and when the use of the second shutter unit is selected, 17. The optical apparatus according to claim 16, wherein the correction unit activates the correction unit.