JPH0667255A - Vibration-proof camera - Google Patents

Abstract

PURPOSE:To prevent the influence of vignetting from carelessly being made large by providing an aperture control means which controls the aperture of the vibration-proof camera according to the relation between information on the photographic state of the camera and the operation state of a vibration- proofing device. CONSTITUTION:Aperture information from an aperture information output means 12 is inputted to a display means 13 and a limiting means 11. This aperture information is a larger and larger output as the aperture is smaller and smaller and the limit level of a limiting means 11 varies according to the output. Then, the limiting means 11 has a function which cuts a large-amplitude part, shown by 14b, of the hand shake output 14a of a vibration detecting means 14 during operation, and the extent of cutting is larger and larger as the aperture is smaller and smaller. A driving means 15 faithfully drives a correction optical means by using the signal of the handshake output 14b after the large amplitude is cut as a command signal. The correction optical means is therefore not driven with the large amplitude and the influence of vignetting is made small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an anti-vibration camera equipped with an anti-vibration device which detects vibration of a relatively low frequency applied to a camera and uses the vibration as information for preventing image blur. is there.

[0002]

2. Description of the Related Art The prior art to which the present invention is applied will be described below.

In modern cameras, all the important operations for photographing such as exposure determination and focusing are automated, so that even a person who is inexperienced in operating the camera is unlikely to make a mistake in photographing. However, it was difficult to automatically prevent only shooting failures due to camera shake.

Therefore, in recent years, a camera capable of preventing a photographing failure due to the camera shake has been actively researched, and in particular, a camera capable of preventing the photographing failure due to a camera shake of a photographer. Is under development and research.

The camera shake at the time of photographing is usually a vibration of 1 Hz to 12 Hz as a frequency. However, at the time of shutter release, it is possible to take a photograph without image shake even if such a camera shake occurs. As a basic idea, it is necessary to detect the vibration of the camera due to the hand shake and displace the correction lens according to the detected value. Therefore, in order to achieve the ability to take a picture without causing image shake even if camera shake occurs, first, it is necessary to accurately detect the camera vibration and secondly correct the optical axis change due to camera shake. Will be needed.

In principle, this vibration (camera shake) is detected by a vibration sensor for detecting angular acceleration, angular velocity, angular displacement, etc., and an output signal of the sensor is integrated electrically or mechanically to determine the angle. This can be done by mounting a camera shake detection unit that outputs displacement on the camera. Then, based on this detection information, the correction optical mechanism that decenters the photographing optical axis is driven to suppress the image blur.

An outline of a vibration isolation system using the angular displacement detecting device will be described with reference to FIG.

The example of FIG. 20 is a diagram of a system for suppressing image shake caused by camera vertical shake 61p and camera horizontal shake 61y in the direction of the arrow 61 in the figure.

In the figure, 62 is a lens barrel, 63p, 63.
y is an angular displacement detection device for detecting the vertical displacement of the camera and the lateral displacement of the camera, and the respective angular displacement detection directions are indicated by 64p and 64y. Reference numerals 65p and 65y denote arithmetic circuits which calculate signals from the angular displacement detectors 63p and 63y and convert them into correction optical system drive signals. This signal drives the correction optical mechanism 66 (67p and 67y are driving portions thereof and 68p and 68y are correction optical position detection sensors) to secure the stability on the image plane 69.

21 to 24 show an example of the configuration of the angular displacement detecting device as the vibration sensor, which will be described below with reference to these drawings.

21 to 23, reference numeral 51 is a base plate on which each component of the apparatus is mounted, and 52 is an outer cylinder having a chamber in which a later-described floating body 53 and liquid 54 are enclosed. 5
A floating body 3 is rotatably held by a floating body holding body 55, which will be described later, around a shaft 53a. The projection 53b has a slit-shaped reflecting surface formed thereon and is made of a material composed of a permanent magnet. It is magnetized in the direction. Further, the floating body 53 is configured such that the rotational balance around the shaft 53a and the buoyancy force are balanced.

Reference numeral 55 denotes a floating body holding body which is fixed to the outer cylinder 52 while holding the floating body 53 via a pivot bearing 56 described later. Reference numeral 57 denotes a U-shaped yoke attached to the base plate 51, which forms a closed magnetic circuit together with the floating body 53.
A winding coil 514 is disposed between the floating body 53 and the yoke 57 and is fixedly provided to the outer cylinder 52. Reference numeral 58 is a light emitting element (iRED) that generates light when energized,
It is attached to the main plate 51. Reference numeral 59 is a light receiving element (PSD) whose output changes depending on the position of the received light, and is attached to the base plate 51. Then, these light emitting elements 58
And the light receiving element 59 is the projection (reflection surface) 53 of the floating body 53.
It constitutes an optical angular displacement detection means of a method of transmitting light via b.

A mask 510 is arranged on the front surface of the light emitting element 58 and has a slit hole 510a for transmitting light. 511 is a stopper member attached to the outer cylinder 52,
The rotation of the floating body 53 is regulated so that the floating body 53 does not rotate beyond a predetermined range.

The rotatably holding of the floating body 53 is performed as follows. That is, as shown in FIG. 12 (FIG. 21A-A cross section), a pivot 512 having a sharp tip is vertically inserted into the center of the floating body 53. On the other hand, pivot bearings 56 are provided at the tips of the U-shaped upper and lower arms of the floating body holding body 55 so as to face each other inward, and the sharp tips of the pivots 512 are fitted into the pivot bearings 56. The floating body is retained.

Reference numeral 513 denotes an upper lid of the outer cylinder 52, which is sealed and adhered by a known technique using a silicone adhesive or the like so that the liquid 54 is enclosed in the outer cylinder 52.

In the above structure, the floating body 53 has a symmetrical shape about the rotating shaft 53a so that the rotating moment does not occur under the influence of gravity in any posture and the load is not substantially applied to the pivot shaft. In addition, it is made of a material having the same specific gravity as the liquid 54. In reality, it is impossible to say that the unbalance component is zero, but since the shape error component acts as an unbalance only by the difference in specific gravity, it is practically sufficiently small, and the SN ratio of friction against inertia is extremely good. Is easy to understand.

In such a structure, even if the outer cylinder 52 rotates around the rotary shaft 53a, the internal liquid 54 remains stationary with respect to the absolute space due to inertia, so that the floating body 53 in the floating state does not rotate, and therefore the outer cylinder. 52 and the floating body 53 rotate relative to each other around the rotary shaft 53a. These relative angular displacements can be detected by an optical detecting means using the light emitting element 58 and the light receiving element 59.

Now, in the apparatus having the above configuration,
The angular displacement is detected as follows.

First, the light emitted from the light emitting element 58 passes through the slit hole 510a of the mask 510 and is applied to the floating body 53, where it is reflected by the slit-shaped reflecting surface of the protrusion 53b and reaches the light receiving element 59. During the transmission of the light, the light becomes substantially parallel light due to the slit hole 510a and the slit-shaped reflecting surface, and an image without blurring is formed on the light receiving element 59.

Since the outer cylinder 52, the light emitting element 58, and the light receiving element 59 are all fixed to the base plate 51 and move integrally, a relative angular displacement movement between the outer cylinder 52 and the floating body 53 is performed. When occurs, the slit image on the light receiving element 59 moves by an amount corresponding to the displacement. Therefore,
The output of the light receiving element 59, which is a photoelectric conversion element whose output changes according to the position of the received light, becomes an output proportional to the positional displacement of the slit image, and the output is used as information for the outer cylinder 52.
The angular displacement of can be detected.

By the way, as described above, the floating body 53 is made of a permanent magnet material having the same specific gravity as that of the liquid 54, which is formed as follows, for example.

When a fluorine-based inert liquid is used as the liquid 54, if a fine powder of a permanent magnet material (for example, ferrite) is contained as a filler in a plastic material as a filler and the content rate is adjusted, the volume content rate is 8 It is easy to set the specific gravity to the same level as the specific gravity "1.8" of the liquid at around%. After the floating body 3 is molded with such a material, or when it is magnetized in the direction of the shaft 53a at the same time, the floating body 53 has a property as a permanent magnet.

FIG. 24 is a sectional view taken along line BB of FIG. 21, showing the relationship among the floating body 53, the yoke 57, and the winding coil 514.

As shown in the figure, the floating body 53 is magnetized in the direction of the shaft 53a. In this figure, the upper side is magnetized to the N pole and the lower side is magnetized to the S pole. The magnetic line of force from the N pole is a U-shaped yoke 5.
A closed magnetic circuit that passes through 7 and enters the S pole is formed. If a current is passed from the back side of the paper to the front side of the winding coil 514 arranged in this magnetic path as shown in the figure, according to Fleming's left-hand rule. The winding coil 514 receives a force in the direction of arrow f. However, as described above, the winding coil 7 has the outer cylinder 5
Since it is fixed with respect to 2, it cannot move, and therefore a force acts in the direction of arrow F, which is its reaction, and the floating body 53 is driven by the force. It goes without saying that this force is proportional to the current flowing in the winding coil 514, and the direction of the force also works in the opposite direction if the current is passed in the opposite direction. That is, in the above structure, the floating body 53 can be freely driven.

The spring force exerted on the floating body 53 by this driving force is, in principle, a force that maintains the floating body 53 in a fixed posture with respect to the outer cylinder 52 (that is, moves integrally), and therefore the spring force. When the force is strong, the outer cylinder 52 and the floating body 53 move integrally, which causes a problem that relative angular displacement does not occur for the intended angular displacement, but the driving force (spring force)
Is sufficiently small with respect to the inertia of the floating body 53, it can be configured to respond to an angular displacement of a relatively low frequency.

FIG. 25 is a diagram showing an electric circuit of the angular displacement detecting device as described above.

Current-voltage conversion amplifiers 515a and 515b
(And resistors R33 to R36) are reflected light 5 of the light emitting element 58.
Photocurrents 517a and 51a generated in the light receiving element 59 by
7b is changed to a voltage, and the differential amplifier 518 (and the resistor R3
7 to 40) are the current-voltage conversion amplifiers 515a, 51
The output difference of 5b, that is, the angular displacement (the relative angular displacement motion between the outer cylinder 52 and the floating body 53) is obtained. This output is connected to resistor 51
9a and 519b divide the output to an extremely small output, and the current is input to the drive amplifier 520 (and the resistor R41 and the transistors TR11 and TR12) that flow a current through the winding coil 514, and the negative feedback (the differential amplifier 518 outputs the floating body). 53
Of the winding coil 514 and the floating body 53 so that the coil returns to the center.
Setting the direction of magnetization of the liquid 54), the liquid 54
A sufficiently small spring force (driving force) is generated with respect to the inertia of.

Summing amplifier 521 (and resistors R42-4)
5) calculates the sum of the amplifiers 515a and 515b (total amount of received light of the reflected light 516 from the light emitting element 58 of the light receiving element), and outputs the output from the drive amplifier 522 (and the resistors R47 to R48) for causing the light emitting element 58 to emit light. , Transistor TR
13 and the capacitor C11).

The light emitting element 58 changes its light emission amount extremely unstablely due to the temperature difference. However, if the light emitting element 58 is driven by the total received light amount as described above, the total photocurrent output from the light receiving element 59 is increased. Is always constant, and the differential amplifier 518
The angular displacement detection sensitivity of is a very stable source.

FIG. 26 is a structural view of a servo angular acceleration sensor as another vibration sensor.

In FIG. 26, reference numeral 523 denotes an outer frame bottom portion, and the support portion 5 integrally fixed to the outer frame bottom portion 523.
24 and bearings 525 with low friction such as ball bearings
a and 525b support both ends of the shaft 526, and the shaft 526 supports the coils 527a and 52e.
A seesaw 528 to which 7b is attached is swingably supported.

Above and below the coils 527a, 527b and the seesaw 528, magnetic circuit boards 530a, 530b as lids and permanent magnets 531a, 53 are separated from them.
1b, 532a, 532b are arranged facing each other,
The magnetic circuit boards 530a and 530b also serve as the lid of the outer frame as described above. Permanent magnets 531a, 531b, 532
a and 532b are mounted on magnetic circuit back plates 533a and 533b fixed to the bottom of the outer frame 523, respectively.

Also, the coil 527a of the seesaw 528.
Is provided with a slit plate 534 forming a slit 534a penetrating in the thickness direction, and the magnetic circuit board 530 also serving as a lid portion of the outer frame above the slit 534a.
A photoelectric displacement measuring device 535 such as an SPC (Separate Photo Diode) is arranged in a, and a light emitting element 536 such as an infrared light emitting diode is arranged on the magnetic circuit back plate 533a below the slit 534a.

In the above structure, assuming that the angular acceleration a acts on the outer frame of FIG. 9 as indicated by an arrow 537, the seesaw 528 relatively tilts in the direction opposite to the angular acceleration a, and this swing angle Can be detected by the position on the displacement measuring device 535 of the beam from the light emitting element 536 through the slit 534a.

By the way, the permanent magnets 531a, 531
The magnetic flux from b is respectively permanent magnets 531a and 531b → coils 527a and 527b → magnetic circuit boards 530a and 530.
b → coils 527a, 527b → permanent magnets 532a, 5
32b, the magnetic fluxes from the other permanent magnets 532a and 532b are the permanent magnets 532a and 532b, respectively, → the magnetic circuit back plate 5
33a, 533b → passes through the permanent magnets 532a, 532b to form a closed magnetic circuit as a whole, and the coil 52
Magnetic flux is formed in a direction perpendicular to 7a and 527b. By providing a control current to the coils 527a and 527b, the seesaw 528 can be moved to both sides along the swing direction of the angular acceleration a according to Fleming's law.

FIG. 27 shows an example of the configuration of an angular acceleration detection circuit used in the servo angular acceleration sensor having the above configuration.

This circuit includes a displacement detection amplifier 538 for amplifying the output from the displacement detector 535, and a compensation circuit 539 for making this feedback circuit a stable circuit system.
And a drive circuit 540 that further current-amplifies the amplified output from the displacement detection amplifier 538 to energize the coils 527a and 527b, and the coils 527a and 527b are connected in series.

Further, in this example, the coil 527 is used.
a, 527b is energized, the external angular acceleration a
The winding direction of the coils 527a and 527b and the polarities of the permanent magnets 531a, 531b, 532a and 532b are set so that a force is generated in a direction opposite to the swing direction of the seesaw 528.

Explaining the operating principle of the servo angular acceleration sensor having the above structure, if the angular acceleration a is applied from the outside to the angular acceleration sensor having the above structure as shown in FIG. The slits 534a provided in the seesaw 528 move in the L direction relative to the other directions. For this reason, the center of the light beam incident on the displacement detector 535 from the light emitting element 536 is displaced, and the displacement detector 535 produces an output proportional to the displacement amount.

The output is the displacement detection amplifier 53 as described above.
8 is further amplified by the driving circuit 540 through the compensating circuit, and the coils 527a and 527b are energized.

When a control current is applied to the coils 527a and 527b as described above, a force is generated in the seesaw 528 in the R direction, which is the opposite direction to the L direction of the external angular acceleration a, and the displacement detector is detected. The control current is generated by adjusting the control current so that the light beam incident on 535 returns to the initial position when the external angular acceleration a is not applied.

At this time, the value of the control current flowing through the coils 527a and 527b is proportional to the rotational force applied to the seesaw 528, and the rotational force applied to the seesaw 528 returns the seesaw 528 to the origin, that is, the external angle. Since it is proportional to the magnitude of the acceleration a, a current is applied to the voltage V through the resistor 541.
By reading as, for example, the magnitude of the angular acceleration a as the control information necessary for the image blur suppression system of the camera can be obtained.

Then, the obtained angular acceleration output is secondarily integrated by a known analog integrator circuit or a digital integrator circuit to be converted into an angular displacement output to be a camera shake output.

FIG. 28 is a diagram more specifically showing the angular acceleration detection circuit of FIG.

In FIG. 28, the amplification amplifier 538a and the resistors 538b and 538c are the displacement detection amplifier 538 of FIG.
The position of the photocurrent from the displacement measuring device 535 is detected by voltage conversion and amplification. Capacitor 539a and resistor 5
39b and 539c correspond to the compensation circuit 539, and include a drive amplifier 540a, transistors 540b and 540c, and a resistor 5
40d, 540e, 540f are coils 527a, 527
This corresponds to the drive circuit 540 that drives b.

FIG. 29 is a view showing a correction optical mechanism and its position detection means and drive means which are preferably used in such a system. The correction lens 545 is composed of two directions perpendicular to the optical axis, that is, a pitch direction 546p and a yaw direction. Direction 546y
(Corresponding to 61p and 61y)] can be freely driven. The configuration is shown below.

In FIG. 29, a fixed frame 547 for holding the correction lens 545 is a polyacetal resin (hereinafter referred to as POM).
It is possible to slide on the pitch slide shaft 549p through a slide bearing 548p such as the above). Further, the fixed frame 547 is sandwiched by a pitch coil spring 551p coaxial with the pitch slide shaft 549p and held near the neutral position. The pitch slide shaft 549p is the first holding frame 55.
It is attached to 0.

The pitch coil 552p attached to the fixed frame 547 includes a pitch magnet 553p and a pitch yoke 5.
The fixed frame 547 is driven in the pitch direction 546p by passing a current. Further, the pitch coil 552p is provided with a pitch slit 555p, and the light emitting element 55
6p (infrared light emitting diode iRED) and light receiving element 557
The position of the fixed frame 547 in the pitch direction 546p is detected by the relation of p (semiconductor position detection element PSD).

A slide bearing 548y such as POM is fitted to the first holding frame 550, and a yaw slide shaft 549 is provided.
It can slide on the housing 558 to which y is attached. Since the housing 558 is attached to the lens barrel (not shown), the first holding frame 550 can move in the yaw direction 546y with respect to the lens barrel. Also, the yaw slide shaft 54
A yaw coil spring 551y is provided coaxially with 9y, and is held near the neutral position like the fixed frame 547.

The fixed frame 547 has a yaw coil 55.
2y is provided, and the fixed frame 547 is also driven in the yaw direction 546y in association with the yaw magnet 553y sandwiching the yaw coil 552y and the yaw yoke 554y. The yaw coil 552y is provided with a yaw slit 555y, and the yaw direction 546 of the fixed frame 547 is the same as the pitch direction.
The position of y is detected.

In FIG. 29, light receiving elements 557p, 55
The output of 7y is amplified by amplifiers 559p and 559y, and the coil (pitch coil 5
52p, yaw coil 552y), the fixed frame 5
47 is driven and the outputs of the light receiving elements 557p and 557y change. When the driving direction (polarity) of the coils 552p and 552y is set to a direction in which the outputs of the light receiving elements 557p and 557y are reduced (negative feedback), a closed system is formed and the outputs of the light receiving elements 557p and 557y become substantially zero. Be stable in terms.

The compensating circuits 560p and 560y are shown in FIG.
9 is a circuit for further stabilizing the system, and is an addition circuit 563.
p and 563y are circuits that add command signals 562p and 562y that are input to the amplifiers 559p and 559y, and drive circuits 561p and 561y are coils 552p and 552y.
It is a circuit that supplements the applied current of.

A command signal 562 is externally supplied to the system as described above.
When p and 562y are given, the correction lens 545 causes the command signal 562p and 562p in the pitch direction 546p and the yaw direction 546y.
It is driven very faithfully to 562y.

The system for driving the position output by negatively feeding back the coil is called position control drive, and the closed system is called a closed loop system.

When the outputs of the angular displacement detectors 63p and 63y are input as the command signals 562p and 562y, the correction lens 545 is faithfully driven based on the output, that is, the correction lens 545 is driven according to the camera shake. Therefore, if the shake direction and the correction lens driving direction are adjusted according to the optical characteristics of the correction lens 545, the image stabilization is performed.

FIG. 30 is a diagram showing in more detail the driving means composed of each circuit for driving the correction lens 545,
Here, only the pitch direction 546p will be described.

Current-voltage conversion amplifiers 563a and 563b
The light emitting element 556p causes the light receiving element 557p (resistor R
1 and R2), and the differential amplifier 565 converts the photocurrent generated in each current-voltage conversion amplifier 563a, 5 into a voltage.
The difference signal represents the position of the correction lens 545 in the pitch direction 546p. As described above, the current-voltage conversion amplifiers 563a and 563b, the differential amplifier 5
The amplifier 559p of FIG. 29 with the resistor 65 and resistors R3 to R10.
Are configured.

The amplifier 566 adds the command signal 562p to the difference signal of the differential amplifier 565, and includes resistors R11 to R11.
The adding circuit 563p of FIG. 29 is configured with R14.

The resistors R15 and R16 and the capacitor C1 are known phase advance circuits, and this is the compensation circuit 56 of FIG.
It corresponds to 0p and stabilizes the system.

The output of the adder circuit 563p is the compensation circuit 5
It is input to the drive amplifier 567 via 60p, where the drive signal of the pitch coil 552p is generated, and the correction lens 5
45 is displaced. The drive circuit 56 shown in FIG. 29 includes the drive amplifier 567, the resistor R17, and the transistors TR1 and TR2.
It composes 1p.

The addition amplifier 568 obtains the sum of the outputs of the current-voltage conversion amplifiers 563a and 563b (the total amount of light received by the light receiving element 557p), and the drive amplifier 569 that receives this signal.
Drives the light emitting element 556p accordingly. Above, the addition amplifier 568, the drive amplifier 569, the resistor R18
A driving circuit for the light emitting element 556p is constituted by R22 and the capacitor C2 (not shown in FIG. 29).

The light emitting element 556p described above changes its projected light amount extremely unstablely with temperature and the like, and accordingly the differential amplifier 5
Although the position sensitivity of 65 changes, the light emitting element 556p is driven by the above-mentioned drive circuit so that the total amount of received light becomes constant as described above.
If you control the position sensitivity will not change.

[0063]

When the camera is equipped with the image stabilization system described above, the correction optical mechanism (correction lens) moves within the lens barrel in a plane perpendicular to the optical axis. Therefore, there were the above problems.

FIG. 31 shows an optical path diagram when the diaphragm 74 is fully open, and 71 is a correction lens.

In FIG. 31, peripheral luminous fluxes 72a, 72b
Passes through the edge 76 of the correction lens 71, so that when the correction lens 71 moves in the direction of arrow 710, some vignetting occurs. However, since the width 77 of the light beam near the diaphragm 74 is wide, the vignetting has almost no influence. However, considering the time when the diaphragm 74 is narrowed down to the state of 75 shown by the broken line, the widths of the light beams 73a and 73b at this time are not different from the widths of the light beams 72a and 72b in the correction lens 71. Similar vignetting occurs, but since the width 78 of the light beam near the diaphragm 75 is narrow, the effect of vignetting cannot be ignored (the ratio of vignetting to the width of the light beam increases).

Further, in the optical system of FIG. 31, the correction lens 71 moves in the direction of arrow 79 by focus adjustment (extending to the close side), but at this time, the interval between the fixed lens 711 and the correction lens 71 becomes wide. , Luminous flux 72a, 72b, 73
The edges a and 73b come closer to the edge 76 of the correction lens 71, and when the correction lens 71 is moved in the direction of the arrow 710, the effect of vignetting appears immediately. Therefore, even if the normal aperture is large or the subject is far away even with the small aperture, there is a case where the effect of vignetting becomes large when the aperture is small and the subject is close.

Further, it can be easily understood that the effect of the vignetting becomes larger in the wide-angle (wider focal length) state with a wide angle of view than in the tele-angle (long focal length) state with a narrow angle of view.

As described above, the influence of vignetting due to the driving of the correction lens 71 changes variously depending on the influence conditions such as the diaphragm, the distance to the subject, and the focal length. At times, the influence cannot be ignored and a satisfactory photograph is taken. There was a problem that I could not get it.

For example, the influence of the diaphragm will be specifically described.

First, let us consider a case where a photograph is taken in a situation where the subject brightness is extremely high during fine weather or when using a flash.

The photographer aims at the subject and presses the release button of the camera halfway to perform AF (automatic focus adjustment).
Determine the composition. When you press the release button halfway down, the anti-vibration system starts to work at the same time, and it starts to suppress camera shake.

FIG. 32 (a) is a diagram showing the situation at that time, and the vertical axis of 712 shows the amount of camera shake or the drive amount of the correction lens for canceling the camera shake, and the camera shake, the correction lens toward the end. The driving amount of becomes large. The horizontal axis of 713 is the time axis,
714 is a point where the release button is half-pressed (SW1 is ON), and 715 is a camera shake or a driving state of the correction lens.

Then, when the amount of driving the correction lens is large as shown in FIG. 32 (a) when the release button is pressed all the way down (SW2 is ON, point 716) for photographing (the photographer does the image stabilization in the viewfinder of the camera). SW because the system is working
When 2 is ON, it cannot be recognized that camera shake or the driving amount of the correction lens is large), and the driving amount of the correction lens remains large during exposure 717 (because the subject brightness is high, the film is appropriate). Exposure time 71 for exposure
7 is extremely short, because the driving amount of the correction lens does not decrease during this period.) Furthermore, since the subject brightness is high, the aperture is also in a small aperture state, so the effect of vignetting has appeared significantly. Will be taken.

Secondly, consider the case where the brightness of the subject is not so high and the image is taken with a small aperture.

In order to deepen the depth of field at the time of shooting, there are cases in which the aperture is intentionally set to a small aperture and the exposure time is lengthened accordingly, and the image is shot.

FIG. 32 (b) is a diagram showing such a state, and there is a point that the driving amount of the correction lens shown by the slanted line becomes large during the exposure time 717, and in such a case also vignetting occurs. The effect of will remain.

In the above description, reference was made only to the diaphragm,
As mentioned above, even if the aperture is small, the effect of vignetting is small,
Vignetting may occur only when the aperture is small and the subject is close, or when the aperture is small and the angle of view is wide, or when the aperture is close and the subject is wide and wide. However, the shooting situation of "close and wide" may occur quite often, and it was not a problem that can be ignored.

(Object of the Invention) A first object of the present invention is to provide an anti-vibration camera capable of preventing the effect of vignetting from being carelessly increased.

A second object of the present invention is to provide an anti-vibration camera capable of calling the photographer attention to camera shake.

A third object of the present invention is to provide an anti-vibration camera which can prioritize vignetting prevention, anti-vibration accuracy, or take a photograph in accordance with the photographer's intention. .

[0081]

SUMMARY OF THE INVENTION The present invention is provided with aperture control means for controlling the aperture of a camera in relation to the information of the photographing condition of the image stabilizing camera and the operating state of the image stabilizing device. The drive amount control means for controlling the drive amount of the correction optical means in relation to the information of the photographing condition and the operating state of the image stabilizing device is provided, and the photographing condition of the image stabilizing camera, for example, aperture information, subject distance information, focus of the photographing lens, etc. Depending on the distance information,
The diaphragm or the drive amount of the correction optical means is controlled.

Further, according to the present invention, when the aperture control means or the drive amount control means is in operation, display means for displaying the operation state is provided, and the control state is displayed on the display means.

Further, in the present invention, the aperture control means or the forced release means for forcibly releasing the operation of the drive amount control means is provided, and if necessary, the forced release means controls the aperture.
Alternatively, the control of the drive amount of the correction optical means can be released.

[0084]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

FIG. 1 is a block diagram showing the construction of the main part of an image stabilization camera according to the first embodiment of the present invention.

The aperture information from the aperture information output means 12 is
It is input to the display means 13 and the limiting means 11. The information of this diaphragm becomes larger as the diaphragm becomes smaller, and the restriction level of the restriction means 11 changes according to the size of the output.
The limiting means 11 has a function of cutting the shake output 14a from the vibration detecting means 14 during operation, as shown by 14b, in a portion having a large amplitude, and the degree of cutting increases as the diaphragm becomes smaller. It is configured to be large (cuts even if camera shake is small).

The simplest example of such limiting means 11 is a variable amplifier 1 using an operational amplifier as shown in FIG.
6 and 17, when the camera shake output 14a from the vibration detecting means 14 is input from the terminal 21, the variable amplifier 16
Is amplified by. This amplification factor is performed by operating the variable resistor 18 with the lever 20 shown by the broken line, and the amplification factor increases as the aperture becomes smaller. However, there is a limit to the driving voltage itself that drives the amplifier 16 (for example, the amplifier has a voltage of 5V).
Even if the camera shake output 14a is amplified, the large-amplitude portion cannot exceed the drive voltage, and the large-amplitude portion has a cut shape (that is, the larger the amplification rate, the more the cut portion is cut). Part increases). Then, in the next amplifier 17, the signal is attenuated by the amount amplified by the amplifier 16 and returned to the original size. However, at this time, since the large amplitude portion has already been cut, it does not return to the original state, and as shown by 14b, the shake output is the large amplitude cut portion, which is the terminal 22.
Will be output. Then, the correction optical means (correction lens) is faithfully driven by the driving means 15 by using this signal as a command signal, so that the correction optical means is not driven with a large amplitude, and therefore the influence of vignetting is reduced.

The aperture information is also output to the display means 13 as described above. For example, as the aperture becomes smaller, the display form of the display means 13 (sound volume, frequency, light blinking period, (Brightness etc.) changes to display that the stroke of the correction optical means is limited, and the photographer is warned not to cause a large camera shake.

The effect of the above structure will be specifically described.

When the photographer aims at the subject and presses the release button halfway down, the automatic exposure function that is standard in current cameras works, and the aperture is narrowed down to obtain the proper exposure when the subject brightness is high. . Then, the aperture information is transmitted from the aperture information output means 12 to the limiting means 11, and the limiting means 11 limits the drive amount of the correction optical means in accordance with the reduction of the aperture amount. Then, it seems to the photographer that the anti-vibration characteristics have deteriorated slightly, but originally, the large amount of drive of the correction optical means required a large amount of camera shake, which does not occur frequently, so it is greatly affected. Absent. Further, when the subject brightness is higher as the diaphragm is made smaller, the exposure time is also extremely short, so that there is no influence of camera shake during exposure, and further, FIG.
Since a large drive amount such as the drive amount 715 of the correction optical unit when the SW2 is ON in (a) is not obtained (because the drive amount is limited), appropriate photographing can be performed without the influence of vignetting.

In general, when the image stabilization is performed with high accuracy, the actual camera shake of the photographer is larger than when the image stabilization is low or when the image stabilization is not performed (the image stabilization is performed on the image plane). Because it has been, the camera shake is suppressed). because,
Ideally, when the photographer is looking into the viewfinder, the image of the subject in the viewfinder will not move even if the camera shakes, such as camera shake, so the photographer is blind. This is because the hands and body gradually sway, becoming closer to. Therefore, the state shown in FIG. 32B is likely to occur, but by limiting the drive amount of the correction optical means as described above, the influence of vignetting is eliminated.

Further, there is a method described below in addition to directly limiting the driving amount of the correction optical means as described with reference to FIG.

The amount of camera shake tends to be larger as the camera shake at lower frequencies. Therefore, in order to limit the driving amount of the correction optical means, it is sufficient that the correction optical means does not respond to the low-frequency camera shake. Therefore, as the limiting means 11, only the low frequency component is cut in the shake output 14a from the vibration detecting means 14 (the image stabilization suppression rate of the low frequency shake is lowered).
A high-pass filter may be provided, and the low frequency (time constant) to be cut may be changed according to the amount of diaphragm.

FIG. 2B shows an example of such a high-pass filter. By changing the resistance value of the resistor 18 in accordance with the diaphragm (the smaller the diaphragm, the smaller the resistance value). Limit the low frequencies that are cut.

(Second Embodiment) FIG. 3 is a block diagram showing the arrangement of the essential parts of an image stabilizing camera according to the second embodiment of the present invention.

The difference from FIG. 1 is that the aperture information output means 12
In addition to the above, focus information output means 22 is provided, and further arithmetic means 21 for computing information from these means and a switch 23 are provided.

The focus information output means 22 increases the output as the distance to the subject becomes shorter, and the calculation means 21 multiplies the focus information by the aperture information from the aperture information output means 12 and limits the output. The means 11 and the display means 13 are activated.

That is, the limiting means 11 operates even with the focus information, but this is because the influence of vignetting changes with the distance to the subject as described above.

Further, the switch 23 is a forced releasing means of the limiting means 11, and it is used in a case where it is desired to give priority to the image stabilization accuracy over the vignetting, because a large amount of camera shake causes a poor photograph to be obtained.

As described above, the effect of vignetting varies depending on the focal length of the lens. Therefore, as shown in FIG. The display unit 13 and the limiting unit 11 are operated by the calculation output of the focal length information, or the structure further including the focus information output unit 24 as shown in FIG. 5, and the calculation output of the aperture, focus and focal length information. You may let me.

Although the present embodiment has been described by taking a camera as an example, it goes without saying that it is also effective for image stabilization of other optical equipment such as a video camera.

In the above example, it was not mentioned how long the drive amount of the correction optical means can be limited from the half-pressing of the release button, but this is the drive amount until the information of the next photographing situation is input. The driving amount may be limited until the release button is pressed (SW2 is turned on).

In the above description, since the exposure time is extremely short after the SW2 is turned on, the correction optical means is largely driven during the exposure without limiting the drive amount after the SW2 is turned on. This is because vignetting does not occur.

(Third Embodiment) In the above example, the drive amount of the correction optical means was limited until the photographing, but FIG.
The drive amount may be reduced only when the drive amount of the correction optical unit is large at the time of turning on SW2 (time 716) in (a).

FIG. 6 is a block diagram showing the construction of the main part of an image stabilizing camera according to the third embodiment of the present invention, which is an example thereof. In this embodiment, the limiting means 11 in FIG. It has been replaced.

The aperture information output means 12 outputs the small aperture information, and the information is transmitted to the centripetal means 25 by pressing the release button (SW2 ON), and if the driving amount of the correction optical means is small at that time, it remains as it is. When a photograph is taken and the driving amount of the correction optical unit is large and the possibility of vignetting is high, the exposure is performed after reducing the driving amount of the correction optical unit to the extent that the influence of the vignetting is eliminated.

With such a configuration, since the drive amount of the correction optical means is not limited from the time when the release button is half pressed, accurate image stabilization is performed and shooting can be performed as it is.
Further, when the amount of driving of the correction optical means is large immediately before the exposure, the correction optical means is returned to the movable center (centered) and photographing is performed until the influence of vignetting disappears. At this time, a slight change in composition occurs, but the correction optical means merely returns the correction optical unit to the last position where the effect of vignetting does not occur, so the change in composition is not so noticeable.

Of course, if the aperture becomes a small aperture for simplification of the circuit, exposure is performed after the correction optical means is forcibly returned to the movable neutral position (the position where the optical axis is not decentered) when SW2 is turned on. May be.

(Fourth Embodiment) In the above description,
The measures against vignetting when the subject brightness is high (small aperture, short exposure time) have been described. An example of intentionally performing small aperture shooting when the subject brightness is not so high is as follows.
A fourth embodiment of the present invention will be described.

At night, when a distant background (neon etc.) and a near object are simultaneously shot, the aperture is opened and long-time exposure is performed without using a flash, the background is shot, and a small aperture is used. In the case of so-called slow sync shooting that uses a strobe together to shoot the subject, when shooting the subject,
Since the aperture is small, vignetting occurs if the driving amount of the correction optical unit at that time is large. This may not be possible even if the configurations of the first to third embodiments are performed.

FIG. 7A shows an example thereof, which is a case of the rear curtain synchronization method in which the background is first photographed without a strobe and the subject is photographed using the strobe immediately before the end of exposure.

The photographer aims at the subject in order to perform the slow sync photography, and presses the release button halfway (SW1 is turned on).
When set to, the aperture diameter of the aperture is determined according to the amount of strobe light and the subject distance (by automatic distance measurement) (the closer the subject is to the camera, the smaller the aperture).

When the aperture is small, the drive amount of the correction optical means is limited or the release button is pressed (SW2) as in the first to third embodiments.
Is turned on), the driving amount of the correction optical means is returned to a position where there is no influence of vignetting. Then, press the release button (SW
2 is ON), but the exposure starts, but SW2 O
After N, the drive amount of the correction optical means is not limited.

The reason for this is that when the drive amount is limited during the exposure, the short-time exposure described above causes no problem, but the exposure time becomes longer like the back exposure period 31 in the slow sync. When the camera shake during exposure becomes large, the camera shake cannot be sufficiently suppressed due to the drive amount limitation of the correction optical means, and image deterioration due to the camera shake occurs on the entire screen. Of course, if the drive amount is not limited, vignetting due to the large drive amount shown by the diagonal line 312 will occur in a part of the screen, but the period in which vignetting occurs is shorter than the exposure period 31 in many cases. Further, vignetting is hardly noticeable in the nighttime background (further, if the diaphragm is opened during the exposure period 31, vignetting does not occur at all).

Then, immediately before the end of the exposure, the strobe is fired to capture the subject (period 32). At this time, the driving amount state of the correction optical means is determined by the photographer in the exposure period 31. It changes due to camera shake. Then, during the period 32 of FIG. 7A, the driving amount 715 of the correction optical unit is in a large state, so that vignetting occurs. This vignetting causes extremely great image deterioration because the flash is being emitted.

However, the above problem does not occur in the case of the first-curtain synchronized photographing (the subject is photographed by causing the strobe to emit light immediately after the start of exposure, and then the back amount is photographed).

In FIG. 7B, the same process as the above-mentioned rear curtain synchronization is performed until SW2 is turned ON (time point 716).
After that, the subject is photographed when the driving amount of the correction optical unit is small (period 32), so that vignetting does not occur.

Therefore, it is possible to eliminate the failure of the photographer by forcibly setting the front curtain sync only when it is determined that the slow sync photography is a small aperture.

FIG. 8 is a block diagram showing the structure of the essential parts of an image stabilizing camera according to the fourth embodiment of the present invention for realizing the above.

The photographer selects slow sync (the exposure information output means 310 outputs the exposure information to that effect),
When the switch 35 is tilted to the rear curtain synchro 39 side by the mode switching means 37 and the camera determines that the aperture will be a small aperture when the subject is imaged, the calculation & switch means 36 inputs both aperture information and exposure information. In this case, the switch 34 is tilted to the side of the front curtain synchro 38 to send information to the exposure control means 311 that it is the front curtain synchro. Also, if the small aperture does not appear when shooting the subject,
The switch 34 is tilted to the switch 35 side, and the exposure control means 3
The information that it is the rear curtain synchronization is sent to 11. That is,
Depending on the state of the switch 35, the front curtain sync 38 and the rear curtain sync 39 can be selected.

With the above-described structure, it is possible to prevent erroneous vignetting on the subject by the trailing curtain synchronization when the slow sync small aperture is used.

The switch 313 is a forced release switch, and when the rear curtain synchronization is required, the switch 313 is opened. Further, the display means 13 forcibly displays that the front curtain synchronization has been reached.

In the above, only the "aperture" has been described.
Similar to FIGS. 3 to 6, it is determined whether or not the front curtain synchronization is forcibly determined from the calculation result of the aperture and focus information, or the aperture and focal length information, aperture, focal length information, and focus information. It goes without saying that there are things.

(Fifth Embodiment) Another example of intentionally performing small aperture shooting when the subject brightness is not so high will be described below.
A fifth embodiment of the present invention will be described.

When it is desired to take a photograph in which the subject and the background before and after the subject are in focus, the aperture is reduced to increase the depth of field, and the exposure time is increased to obtain an appropriate exposure. May be taken as a picture (assuming depth shooting).

In such a case, the above-described "limit the driving amount of the correction optical means until just before the exposure" or "return the correction optical means to a position not affected by vignetting just before the exposure" is sufficient. Vignetting measures cannot be taken.

The reason is that, since the exposure time is long, a large camera shake occurs during the exposure time, and when the correction optical means is largely driven, vignetting may occur. Of course, at the start of exposure, the correction optical means is at a position where there is no influence of vignetting, so vignetting does not occur immediately after the start of exposure. Therefore, in the case of performing such depth photographing, a vignetting countermeasure is taken by controlling the diaphragm according to the driving amount of the correction optical means during exposure.

Specifically, when the driving amount of the correction optical means is driven to a position where the vignetting influences during the exposure (small aperture), the aperture is opened to a position where the vignetting does not affect and the exposure is performed correspondingly. Remove the effect of vignetting while shortening the time and maintaining proper exposure.

When depth photography is performed as shown in FIG. 9A, when the driving amount of the correction optical means increases during exposure (period 717), a portion causing vignetting appears in the shaded area. By controlling and opening the diaphragm when the driving amount of the correction optical unit indicated by the arrow 315 in FIG. 9B becomes large, the influence of vignetting disappears because the diaphragm is not a small diaphragm. Further, since the aperture is opened, the exposure time 314 becomes shorter than the exposure time 717, and the exposure ends before the driving amount of the correction optical unit becomes larger. Of course, the depth of field in depth photography becomes shallower by that amount, but the image deterioration due to vignetting will no longer occur.

FIG. 10 is a block diagram showing the structure of the main part of an image stabilizing camera according to the fifth embodiment of the present invention for realizing the above.

The comparing means 316 outputs when the driving amount of the correction optical means exceeds a certain threshold value, and the threshold value changes with the output of the calculating means 21. For example, the aperture 31
When 7 is a small aperture, the threshold value is lowered due to the change of the aperture information, and when the driving amount of the correction optical means is increased to some extent, the comparison means 316 outputs, and when the aperture 317 is not so small, the threshold value is raised and the correction is performed. The comparing means 316 does not output unless the driving amount of the optical means becomes considerably large.
Further, since the diaphragm 317 increases its diaphragm diameter by the output of the comparison means 316, a closed loop is formed between the diaphragm 317 and the comparison means 316 (because the diaphragm threshold changes), and the correction optical means operates. The aperture is controlled to match the drive amount. When the diaphragm 317 is enlarged, the exposure information of the shutter 318 is changed to be shortened by the diaphragm information, and the proper exposure is maintained.

The shutter information from the shutter information output means 320 is input to the switches 321 and 319, and the switch 321 is closed and the switch 3 is opened until the shutter is opened.
19 is open, and like the second embodiment described above,
The drive amount of the correction optical means is limited. Then, when the shutter is opened, the switch 321 is opened, the drive amount limitation is released, the switch 319 is closed, the drive amount of the correction optical unit is input to the comparison unit 316, and the aperture control is performed.

With the above construction, when the driving amount of the correction optical means becomes large during exposure, it is possible to open the diaphragm and conversely close the shutter quickly to eliminate the effect of vignetting. At this time (when the subject brightness is high), the driving amount of the correction optical means does not increase during exposure (due to the short exposure time), so the aperture control is not performed.

(Sixth Embodiment) Vignetting that occurs during depth photography is due to alternating vibration of camera shake, so vignetting may occur several times during exposure, and each vignetting is the entire exposure time. However, since it is short, it does not cause image deterioration so much, but when it occurs several times, image deterioration may occur. This case will be described below as a sixth embodiment of the present invention.

In FIG. 11 (a), there is a large drive amount portion of the correction optical means which causes vignetting in the exposure time 717, but the vignetting time is the exposure time until the time indicated by the arrow 315. Since it is shorter than the above, image deterioration does not occur so much, but when there is a vignetting state after the arrow 315, the image deterioration becomes noticeable.

In such a case, as shown in FIG.
Keep the small aperture up to 15, and open the aperture after arrow 315 to eliminate the effect of vignetting.

FIG. 12 is a block diagram showing the main structure of the image stabilizing camera in the sixth embodiment of the present invention. The difference from FIG. 10 is that the integrating means 322 is provided and the comparing means 3 is provided.
The 16 outputs are integrated, and when the output exceeds a certain level, control of the aperture is started. That is, since the iris is not controlled up to the arrow 315 and shooting can be performed with a small iris, the depth of field can be maintained deep.

Therefore, the depth effect is high and it is possible to shoot without vignetting.

(Seventh Embodiment) The relationship between the diaphragm, the focus information, the focal length information and the image stabilization system has been described above. The diaphragm described above is a lens mirror as shown in FIG. The aperture is not limited to an aperture used in an exposure control unit that includes an aperture unit 91 that can be driven and controlled by a step motor or the like provided on the barrel 82 and a focal plane shader 92 that is provided on the camera body 93, and is not limited to a video camera. A diaphragm used in an exposure control unit, which is composed of an image pickup device such as a CCD, and a diaphragm unit that can be driven and controlled, such as a movable magnet similar to the diaphragm unit 91, and a diaphragm that is also used in a compact camera or the like. It is also applicable to the lens shutter unit.

Among the aperture / shutters (hereinafter referred to as lens shutters) mounted on the compact camera, the lens shutter mounted on the high-end model compact camera is shown in FIG.
It has a structure as shown in FIG.

In FIG. 14, two shutter blades 10 are provided.
01a and 1001b are rotatably supported around shafts 1002a and 1002b, respectively, and elongated holes 1003a and 1003a provided in the shutter blades 1001a and 1001b, respectively.
1003b (the long hole 1003b is hidden by the shutter blades and cannot be seen), the protruding shaft 100 provided on the lever 1003.
4 is inserted. The lever 1003 is the actuator 1
The actuator 1005, the lever 1003, and the protruding shaft 1004 form a driving unit.

The actuator 1005 is a moving coil type and can rotate in the direction of arrow 1006.
004 is rotated in the direction of arrow 1007 via a lever 1003, and the shutter blades 1001a and 1001b are protruded shaft
Driven in the directions of arrows 1008a and 1008b by the elongated holes 1003a and 1003b in which 004 is fitted, the light flux in the optical axis direction 1009 is limited. Also, the shutter blade 10
01b is provided with a position display portion 1010, and the position display portion 1010 is provided with a plurality of slits 1011. The photo interrupter 1012 detects the position of the shutter blade 1001b by counting the number of slits 1011 passing through the space 1013 sandwiched by the photo interrupter 1012 and detecting the position of the shutter blade 1001b.
01a and shutter blades 1001b are elongated holes 1003a, 1
Both are driven by substantially the same amount by the protruding shafts 1004 fitted in both 003b, so that the photo interrupter 1012 detects the positions of both the shutter blades 1001a and 1001b, that is, detects the limiting amount of the light flux in the optical axis direction 1009. Will be there.

Reference numeral 1014 denotes a shutter base plate, 1015
Is an opening (aperture) provided in the shutter base plate 1014.

In the above configuration, the output of the photo interrupter 1012 is input to the microcomputer 1016 of the camera, and the drive circuit 1017 is output by the output of the microcomputer 1016.
Works, and the actuator 1005 is driven.

The microcomputer 1016 also receives the photometric value 1018 of the subject, and controls the drive circuit 1017 by the photometric value 1018 and the output of the photo interrupter 1012.

The control method is such that, for example, when the subject is extremely bright, the microcomputer 1016 uses the photo interrupter 1
The pulse output of 012 drives the shutter blades 1001a and 1001b in the opening direction by the number of pulses corresponding to the photometric value 1018, and then in the closing direction. When the subject is dark, the pulse of the photo interrupter 1012 is Until all output is completed (shutter blades 1001a, 1001
(b is fully opened) It drives in the opening direction and continues to drive in the opening direction thereafter (in this case, the shutter blades 1001a and 1001b).
Is kept open because it is not driven further in the opening direction by a stopper etc. when it is fully opened). Then, at a predetermined time, that is, after a lapse of a time sufficient to expose the subject to the film, the shutter is driven in the closing direction to move the shutter blade 1001.
a and 1001b are fully closed.

Supplementing the above operation, the shutter blades 1001a and 1001b are initially in the fully closed state,
The shutter blades 1001a and 1001b are driven in the opening direction by pressing the release button (SW2 is ON). Then, due to the output of the photo interrupter 1012 accordingly, the number of pulses is small when the subject is bright (for example, the photo interrupter 1012 outputs 2 pulses).
The shutter is driven in the closing direction, and when the subject is dark, the shutter is driven in the closing direction after a lapse of a predetermined time after outputting all the pulses of the photo interrupter 1012.

Therefore, when the subject is bright,
As shown in (a), the optical path is limited by the shutter blades 1001a and 1001b (the opening area is small), and the opening time 1101a is short. On the other hand, when the subject is dark, it is fully opened as shown in FIG. 15 (b). Therefore, the opening time 1101b also becomes longer.

In FIG. 15, the horizontal axis represents time and the vertical axis represents the opening area formed by driving the shutter blades 1001a and 1001b in the opening direction.

In the aperture state (the subject brightness is high) as shown in FIG. 15A, the aperture area, that is, the diaphragm is also small, and vignetting may occur depending on the driving amount of the correction optical means. . Therefore, when the photometric value 1018 is output (comprehensively judging from the focus information and focal length information), the drive amount of the correction optical means is limited when the SW1 is ON, or the correction amount is corrected when the SW2 is ON. Return the optical means to a position that is not affected by vignetting.

Now, consider the case where the photographer actually photographs.

For example, in a situation where a person who is the main subject is photographed with the mountain in the back, the photographer often wants a photograph in which both the person and the mountain are in focus (depth photographing). Then, when taking such a photograph, as shown in FIG.
As shown in (c), it is necessary to stop the aperture as much as possible (the shutter opening area is made small) and keep the shutter open for a sufficient time to expose the film. Similarly, in slow sync photography, the subject is on the near side,
There are also cases where it is desirable to squeeze the strobe with a narrow aperture and perform long-time exposure.

However, such a method of driving the shutter blades cannot be realized in the example of FIG. Because,
In the example, the shutter can be driven only in the opening direction or the closing direction, and cannot be held in a squeezed state (a state in which the opening area is small).

In FIG. 14, in order to hold the shutter in a closed state, for example, the shutter blades 1001a and 101
01b starts to open, the photo interrupter 1012 outputs 2 pulses, and then the shutter is operated in the closing direction, and if the shutter blades continue to be closed and driven in the opening direction according to the increase or decrease in the number of pulses thereafter, the squeezed state can be maintained. As it seems, the photo interrupter 1012 can actually detect the number of slits 1011 (that is, pulses) that have passed between them, but since it does not know the passing direction (that is, whether the pulse has increased or decreased), Things cannot be realized.

In order to hold the diaphragm in a closed state,
As used in a video camera, an amplifier circuit 1203 amplifies a difference between a light amount incident on an image sensor 1201 and a command value 1202 shown in FIG.
There is a method of driving 001a and 1001b.

In this case, since the image pickup device 1201 can detect the amount of incident light and the increasing / decreasing direction thereof, the diaphragm can be kept in an optimum state of the amount of light incident on the image pickup device 1201.

Of course, in the still camera, it is not possible to prepare the image pickup device 1201 from the standpoint of space and cost, but the same idea is adopted, and as shown in FIG. 17, the shutter blade 1001b is added to the position display section 1010. When the hole 1301 whose opening widens in accordance with the opening direction is penetrated, the output of the photo interrupter 1012 changes depending on the position of the shutter blade 1001b, and the output causes the shutter blade 1 to move.
The position and drive direction of 001b are known, and the shutter blade 1001b can be held by its output.

That is, in FIG. 17, the shutter blade 1
When 001a and 1001b are driven in the opening direction, the output of the photo interrupter 1012 becomes larger accordingly, but the output of the photo interrupter 1012 is larger than that of the microcomputer 1016 according to the aperture value (opening area) defined by the photometric value 1015. When the output 1012 is small, the output difference is amplified by the amplifier circuit 1203, and the drive circuit 1017 drives the drive means to open the shutter blades 1001a and 1001b. Then, as the output of the photo interrupter 1012 approaches the output of the microcomputer 1016, the driving force of the shutter blades 1001a and 1001b of the driving means in the opening direction weakens. When the output of the photo interrupter 1012 becomes the same as the output of the microcomputer 1016, the opening direction The driving force is lost.

However, the shutter blades 1001a, 101
01b moves further in the opening direction due to its inertial force,
The output of the photo interrupter 1012 is the microcomputer 1016.
Will be larger than the output of. Then, since the polarity of the output difference is reversed, the drive circuit 1017 drives the drive means in the opposite direction via the amplifier circuit 1203 to drive the shutter blades in the closing direction. When the output of the photo interrupter output 1012 becomes smaller than the output of the microcomputer 1016, the shutter blades 1001a and 1001b are driven again in the opening direction.

By repeating such operations, the shutter blade 10
01a and 1001b gradually stabilize to a predetermined aperture value determined by the output of the microcomputer 1016. When the output of the microcomputer 1016 becomes small after a predetermined exposure time has elapsed, the shutter blades are driven in the closing direction so that the output of the photo interrupter 1012 becomes small (that is, the shutter blades close), and the shutter closes.

Here, if the shutter blades 1001a and 1001b are driven as shown in FIG. 15C, for example,
The output of the microcomputer 1016 is small as shown in FIG. 18 (c) and is output for a long time, and when driven as shown in FIG. 15 (b), the output is large as shown in FIG. 18 (b). In the case of driving as shown in FIG. 15 (a), output may be small and output for a short time as shown in FIG. 18 (a), and the driving method of the shutter blades can be freely controlled by the output magnitude and output time of the microcomputer 1016. I can.

Since the output of the microcomputer 1016 itself (output within the microcomputer) can output only a binarized value, the output interval δt is changed as shown in FIGS. 18 (d), 18 (e) and 18 (f). After that, by passing a known smoothing circuit,
18 (a), (b), (c), even if the outputs of (a), (b), and (c) are produced, the numerical data in the microcomputer is converted into an analog output by the D / A converter, and the outputs shown in FIGS. May produce the output of

A method of detecting the driving amount as shown in FIGS. 16 and 17 and automatically driving so as to reduce the difference between the value and the target value is called an automatic control method. These techniques are used in various fields.

In the case of the lens shutter having the structure using the automatic control as described above, since it becomes possible to perform the aperture-long exposure at a long time as shown in FIG. 15C, after the description in FIG. 7A. Vignetting problem during curtain slow sync, Fig. 9 (a), Fig. 11
Although the problem of vignetting at the time of depth shooting described in (a) and FIG. 31 (b) also arises, with regard to the slow synchro, the front curtain synchro is used, and the drive amount of the correction optical means is limited until before exposure. Alternatively, it can be solved by reducing the driving amount of the correction optical unit immediately before exposure, and also in depth photography,
If the driving amount of the correction optical means increases during the exposure due to the automatic control shutter, the aperture may be widened and the exposure may be stopped earlier by that amount. The target value of the microcomputer 1016 in FIG. 18C is shown in FIG. SW2 is turned on (time point 716)
When the exposure for a long time is continued with a small target value 1404 (small aperture) and the effect of vignetting is accumulated to some extent (arrow 315), the target value is increased (time point 1405: the aperture is widened) and Close the shutter earlier (minute 1
402). Therefore, the exposure time is 31 when the small aperture is long.
4 shutter close, earlier than time 1403 (time 14
04) Shooting ends, but vignetting does not occur.

According to each of the above embodiments, the means for controlling the driving amount of the correction optical means according to the photographing condition (aperture etc.) of the camera, or the means for controlling the photographing condition of the camera and the driving amount of the correction optical means. By providing a means for controlling the aperture with the use of a vignetting mechanism, it is possible to prevent the effect of vignetting from being inadvertently increased, and by displaying a display indicating the operation of the control means, the photographer pays attention to camera shake. As a result, good photos can be obtained.

Further, by providing a means for forcibly releasing the control means, it is possible to give priority to the image stabilization accuracy over the vignetting, and it becomes possible to obtain a photograph that suits the photographer's intention.

[0167]

As described above, according to the present invention,
A diaphragm control means for controlling the diaphragm of the camera is provided in relation to the information of the photographing condition of the image stabilizing camera and the operating state of the image stabilizing device, and the information of the photographing condition of the image stabilizing camera and the operating state of the image stabilizing device are provided. In relation to this, a drive amount control means for controlling the drive amount of the correction optical means is provided, and the diaphragm or the correction optical means is controlled according to the photographing condition of the image stabilizing camera, for example, diaphragm information, subject distance information, or focal length information of the photographing lens. The drive amount of the means is controlled.

Therefore, it is possible to prevent the influence of vignetting from being carelessly increased.

Further, according to the present invention, when the diaphragm control means or the drive amount control means is in operation, a display means for displaying the operating state is provided, and the control state is displayed on the display means. .

Therefore, it is possible to call the photographer's attention to camera shake.

Further, according to the present invention, the aperture control means or the forced release means for forcibly releasing the operation of the drive amount control means is provided, and if necessary, the forced release means controls the aperture. Is capable of canceling the control of the driving amount of the correction optical means.

Therefore, it becomes possible to prioritize the vignetting prevention or the image stabilization accuracy, or to take a photograph according to the photographer's intention.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of an image stabilization camera according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a specific configuration example of a limiting means shown in FIG.

FIG. 3 is a block diagram showing a main configuration of an image stabilization camera according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing another configuration example of the image stabilizing camera according to the second embodiment of the present invention.

FIG. 5 is a block diagram showing another configuration of the image stabilizing camera according to the second embodiment of the present invention.

FIG. 6 is a block diagram showing a main configuration of an image stabilization camera according to a third embodiment of the present invention.

FIG. 7 is a diagram for explaining control of a driving amount of a correction optical unit according to a fourth embodiment of the present invention.

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

FIG. 9 is a diagram for explaining control of a driving amount of a correction optical unit according to a fifth embodiment of the present invention.

FIG. 10 is a block diagram showing a main configuration of an image stabilization camera according to a fifth embodiment of the present invention.

FIG. 11 is a block diagram showing a main configuration of an image stabilization camera according to a sixth embodiment of the present invention.

FIG. 12 is a block diagram showing a main configuration of an image stabilization camera according to a sixth embodiment of the present invention.

FIG. 13 is a perspective view of a camera for explaining a relationship between a diaphragm and a shutter of a general camera.

FIG. 14 is a diagram for explaining a diaphragm / shutter camera which is a target of a seventh embodiment of the present invention.

15 is a diagram for explaining an exposure time and a diaphragm aperture area under each photographing condition in the camera of FIG.

FIG. 16 is a diagram for explaining another configuration example of the aperture / shutter camera which is the target of the seventh embodiment of the present invention.

FIG. 17 is a diagram for explaining another configuration example of the aperture / shutter camera which is the target of the seventh embodiment of the present invention.

FIG. 18 is a diagram for explaining the relationship between microcomputer output and exposure time in the camera of FIG.

FIG. 19 is a diagram for explaining the operation of the aperture / shutter camera which is the target of the seventh embodiment of the present invention.

FIG. 20 is a perspective view showing a schematic configuration of a conventional vibration isolation device.

FIG. 21 is a plan view showing an angular displacement detection device which is one of conventional vibration detection means.

22 is a cross-sectional view taken along the line AA of FIG.

23 is a perspective view of the angular displacement detection device shown in FIG.

24 is a sectional view taken along line BB of FIG.

FIG. 25 is a circuit diagram showing an electrical configuration of the angular displacement detecting device shown in FIG.

FIG. 26 is an exploded perspective view showing a configuration of a servo angular accelerometer which is one of conventional vibration detecting means.

27 is a block diagram showing an electrical configuration of the servo angular accelerometer of FIG.

FIG. 28 is a circuit diagram specifically showing the electrical configuration of FIG. 27.

29 is a diagram showing a correction optical mechanism and its driving means in the image stabilizing apparatus of FIG.

30 is a circuit diagram specifically showing the electrical configuration of the driving means and the like shown in FIG.

FIG. 31 is an optical layout diagram for explaining a problem in a conventional image stabilizing camera.

FIG. 32 is a diagram for explaining a problem in the conventional image stabilizing camera.

[Explanation of symbols]

 11 Limiting Means 12 Aperture Information Outputting Means 13 Displaying Means 14 Vibration Detecting Means 15 Driving Means for Correcting Optical Means 21 Calculating Means 22 Focusing Information Outputting Means 23 Switches 24 Focal Length Information Outputting Means 25 Centripetal Means 36 Computing & Switching Means 316 Comparing Means 322 component means

Claims (15)

[Claims] 1. A correction optical unit that is disposed in a lens barrel that holds a lens unit, decenters an optical axis of the lens unit, and is supported so as to be drivable relative to the lens barrel, and the correction optical unit. A protection device having position detecting means for detecting the position of the optical means, vibration detecting means for detecting the vibration input to the lens barrel, and driving means for driving the correcting optical means with the output from the vibration detecting means as a target value. An anti-vibration camera equipped with an anti-vibration device, characterized in that an anti-vibration device is provided which controls the aperture of the camera in relation to the information on the photographing condition of the anti-vibration camera and the operating state of the anti-vibration device camera. 2. The image stabilizing camera according to claim 1, wherein the diaphragm control means is means for controlling the diaphragm so as not to fall below a predetermined amount when the driving amount of the correction optical means is large. 3. The aperture control means is means for controlling the aperture to increase to a predetermined amount or more when the driving amount of the correction optical means increases in a state where the aperture is smaller than the predetermined amount. The anti-vibration camera according to claim 1, which is characterized in that. 4. The aperture control means increases the aperture to a predetermined amount or more when the cumulative time when the driving amount of the correction optical means is large becomes a certain value or more with respect to the exposure time to the film. The anti-vibration camera according to claim 3, characterized in that it is a means for controlling. 5. A correction optical unit that is disposed in a lens barrel that holds a lens group, decenters an optical axis of the lens group, and is supported so as to be drivable relative to the lens barrel, and the correction optical unit. A protection device having position detecting means for detecting the position of the optical means, vibration detecting means for detecting the vibration input to the lens barrel, and driving means for driving the correcting optical means with the output from the vibration detecting means as a target value. In an anti-vibration camera provided with a vibration device, a drive amount control means for controlling the drive amount of the correction optical means is provided in relation to the information of the photographing condition of the anti-vibration camera and the operation state of the anti-vibration device A characteristic anti-vibration camera. 6. The drive amount control means, when the information on the photographing condition is input, immediately before the exposure to the film, the correction optical means returns the correction optical means so that the eccentricity of the optical axis of the correction optical means becomes equal to or less than a predetermined amount. The anti-vibration camera according to claim 5, which is means for controlling a driving amount of 7. The drive amount control means is a means for limiting the drive amount of the correction optical means to a predetermined amount or less until just before the exposure to the film when the information on the photographing condition is inputted. The anti-vibration camera described in 5. 8. A front curtain synchro photography in which a strobe device is provided, and at the time of slow sync photography in which the strobe device emits light during exposure and the exposure time is lengthened, the strobe device is forced to emit light immediately after the start of exposure. 7. A strobe control means for controlling the operation is provided.
Alternatively, the anti-vibration camera described in 7. 9. The drive amount control means is a means for controlling to reduce the image stabilization suppression rate of low-frequency shake in the image stabilizer according to the information of the photographing condition. Anti-vibration camera. 10. The anti-vibration camera according to claim 1, further comprising display means for displaying an operating state of the diaphragm control means or the drive amount control means when the diaphragm control means is in operation. 11. The anti-vibration camera according to claim 1, further comprising a photographing condition output means for outputting information on a photographing condition when the aperture of the camera is small. 12. The anti-vibration camera according to claim 1 or 5, further comprising: shooting condition output means for outputting information on a shooting condition in relation to a diaphragm of the camera and information on a distance to a subject. 13. The image stabilizing camera according to claim 1, further comprising a photographing condition output means for outputting information on a photographing condition in association with the aperture of the camera and the focal length information of the photographing lens. 14. A photographing condition output means for outputting information on a photographing condition in relation to a diaphragm of a camera, distance information to a subject, and focal length information of a photographing lens, according to claim 1 or 5. Anti-vibration camera. 15. The anti-vibration camera according to claim 1, further comprising a forced release means for forcibly releasing the operation of the aperture control means or the drive amount control means.