JPH0566444A - Camera provided with vibration proof function - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to prevent deterioration of vibration isolation accuracy due to functions other than the vibration isolation system. [Structure] Control means 13 and 14 for changing the function of the camera other than the image stabilization system are provided when the image stabilization system is operating, and are provided in addition to the normal second film exposure switch when the image stabilization system is operating. Only the first film exposure switch for anti-vibration, which is turned on by a simple pressing operation, is made to function, and among various AF modes, the AF mode in which the lens is repeatedly started and stopped is prohibited. Alternatively, the driving speed of the mirror for switching the optical path is switched to the low speed side, and the acceleration and deceleration at the time of starting and stopping the lens are moderated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration function provided with an anti-vibration system having drive means for displacing the correction optical means relative to the lens barrel based on the anti-vibration output from the vibration detection means. It relates to the improvement of the attached camera.

[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 the failure of shooting due to camera shake.

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

The camera shake during photographing is usually a vibration of 1 Hz to 12 Hz as a frequency, but at the time of releasing the shutter, it is possible to take a photograph without image shake even if such a shake occurs. As a basic idea for this, it is necessary to detect the vibration of the camera due to the camera shake and displace the correction lens according to the detected value. Therefore, in order to achieve the above-mentioned object (that is, a photograph can be taken without causing image blur even if the camera shake occurs), first, the camera vibration is accurately detected, and
It is necessary to correct the optical axis change due to camera shake.

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 performed by mounting a camera shake detection unit that outputs displacement on the camera. Then, based on the detection information, the correction optical mechanism that decenters the photographing optical axis is driven to suppress the image blur.

Here, an outline of an image blur suppression system (anti-vibration system) using an angular displacement detector will be described with reference to FIG.

The example of FIG. 6 is a diagram of a system for suppressing the image shake caused by the camera vertical shake 61p and the 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 that calculate the signals from the angular displacement detectors 63p and 63y and convert them into corrected optical system drive signals. This signal drives the correction optical mechanism 66 (67p and 67y are drive parts thereof and 68p and 68y are correction optical position detection sensors) to ensure stability on the image plane 69.

7 to 11 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.

In FIGS. 7 to 10, 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 floating body 53 and a liquid 54 described later are enclosed. 53
Is a floating body which is rotatably held around a shaft 53a by a floating body holding body 55 described later. The projection 53b has a slit-shaped reflecting surface, and is made of a permanent magnet material. Has been magnetized. 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 arranged 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, and
1 is attached. Reference numeral 59 denotes a light receiving element (PSD) whose output changes depending on the position of the received light, which is attached to the main plate 51. The light emitting element 58 and the light receiving element 59 constitute an optical angular displacement detection means of a method of transmitting light via the projection (reflection surface) 53b of the floating body 53.

Reference numeral 510 denotes a mask arranged on the front surface of the light emitting element 58, which has a slit hole 510a for transmitting light. 511 is a stopper member attached to the outer cylinder 52,
The rotation 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. 8 (A-A cross section of FIG. 7), a pivot 512 having a sharp tip vertically is press fitted 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 seal-bonded 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-mentioned structure, the floating body 53 does not generate rotational moment due to the influence of gravity in any posture, and the pivot shaft 53a is rotated about the rotational shaft 53a so that the load is not substantially applied. In addition to having a symmetrical shape, it is made of a material having the same specific gravity as the liquid 54. In reality, it is impossible to have an unbalance component of zero, but since the shape error only acts as an unbalance due to 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 about the rotary shaft 53a, the internal liquid 54 remains stationary with respect to the absolute space due to inertia. Therefore, the floating body 53 in the floating state does not rotate, and thus the outer cylinder is not rotated. 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-mentioned structure,
The detection of the angular displacement is performed 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, the 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 depending on 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, a plastic material is used as a filler in the base, and fine powder of a permanent magnet material (for example, ferrite) is contained in the base 54 to adjust the content rate. It is easy to set the specific gravity to the same level as the specific gravity "1.8" of the liquid when the content rate is around 8%. After the floating body 3 is molded with such a material or simultaneously magnetized in the direction of the shaft 53a, the floating body 53 has a property as a permanent magnet.

FIG. 10 is a sectional view taken along line BB in FIG. 7 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, and if a current is applied to the winding coil 514 arranged in this magnetic path from the back side of the paper to the front side as shown in the figure, Fleming's left-hand rule is followed. 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 No. 2, it cannot move, and therefore a force acts in the direction of the 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). If the force is strong, the outer cylinder 52 and the floating body 53 move as a unit, causing 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 angular displacement of a relatively low frequency.

FIG. 11 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.
16. Photocurrents 517a and 51a generated in the light receiving element 59 by 16
7b is changed to a voltage, and the differential amplifier 518 (and the resistor R3
7-40) are the current-voltage conversion amplifiers 515a, 51
The output difference of 5b, that is, the angular displacement (the relative angular displacement movement between the outer cylinder 52 and the floating body 53) is obtained. This output is connected to resistor 51
9a, 519b divides 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 magnetization direction 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) finds the sum of the amplifiers 515a and 515b (the 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 to the drive amplifier 522 (and the resistors R47 to R48) that cause 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 light receiving 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. 12 is a structural diagram of a servo angular acceleration sensor as another vibration sensor.

In FIG. 12, 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 ball 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 chassis 528, magnetic circuit boards 530a, 530b as a lid and permanent magnets 531a, 53 are separated from each other.
1b, 532a, 532b are arranged facing each other,
The magnetic circuit boards 530a and 530b also serve as the lid portion 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.

Further, the coil 527a of the above-mentioned seesaw 528.
A slit plate 534 forming a slit 534a penetrating in the thickness direction is provided on the top of the magnetic circuit board 530 which also functions as a lid portion of the outer frame above the slit 534a.
A photoelectric displacement measuring instrument 535 such as SPC (Separate Photo Diode) is arranged at 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. There is.

In the above structure, assuming that the angular acceleration a acts on the outer frame of FIG. 12 as indicated by arrow 537, the seesaw 528 relatively tilts in the direction opposite to the angular acceleration a. The deflection angle can be detected by the position of the beam on the displacement measuring device 535 from the light emitting element 536 through the slit 534a.

By the way, the permanent magnets 531a and 531 are
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 respectively permanent magnets 532a and 532b → 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
A magnetic flux in a direction perpendicular to 7a and 527b is formed. By providing a control current to the coils 527a and 527b, it is provided so that the seesaw 528 can be moved to both sides along the deflection direction of the angular acceleration a according to Fleming's law.

FIG. 13 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 comprises 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.

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

The principle of operation of the servo angular acceleration sensor having the above structure will be described. If the angular acceleration a is applied to the angular acceleration sensor having the above structure from the outside as shown in FIG. The force causes the outer frame to swing relatively in the opposite rotational direction, so that the slit 534a provided in the chassis 528 moves in the L direction. 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 drive circuit 540 through the compensating circuit, and the current is amplified by the coils 527a and 527b.

As described above, when a control current is applied to the coils 527a and 527b, a force in the R direction, which is a direction opposite to the L direction of the external angular acceleration a, is generated in the chassis 528, and the displacement occurs. The control current is adjusted and generated so that the light flux incident on the detector 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 has the origin at the soseo 528. Since it is proportional to the returning force, that is, the magnitude of the external angular acceleration a, the 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 or the like can be obtained.

FIG. 14 is a diagram more specifically showing the angular acceleration detection circuit of FIG.

In FIG. 14, 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 the drive b.

The angular acceleration obtained as described above is secondarily integrated by a well-known integrating circuit to obtain angular displacement information, and the correction optical mechanism is driven based on the angular displacement detection device to prevent it, as in the case of the angular displacement detection device. You can shake.

FIG. 15 is a view showing the arrangement of a correction optical mechanism that is preferably used in such a system, and the correction lens 54
5 is two directions perpendicular to the optical axis and perpendicular to each other [pitch direction 5
46p and yaw direction 546y (corresponding to 61p and 61y)]. The structure is shown below.

In FIG. 15, 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 placed in a magnetic circuit composed of 54p, and the fixed frame 547 is driven in the pitch direction 546p by passing a current. 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 557p
Due to the (semiconductor position detection element PSD) connection, the fixed frame 5
The position of 47 in the pitch direction 546p is detected.

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.

A yaw coil 55 is attached to the fixed frame 547.
2y is provided, and a yaw that sandwiches the yaw coil 552y is provided.
The fixed frame 547 is also driven in the yaw direction 546y in association with the magnet 553y and the yaw yoke 554y. Above yo
The 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. 15, 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. Here, when the driving direction (polarity) of the coils 552p and 552y is set to a direction in which the output of the light receiving elements 557p and 557y becomes smaller, a closed system (closed loop) is formed, and the outputs of the light receiving elements 557p and 557y become almost zero. Stabilizes at

The compensating circuits 560p and 560y are shown in FIG.
5 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 above system.
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.

FIG. 16 is a diagram showing the driving means for driving the correction optical mechanism in more detail. Here, the pitch direction 54 is used.
Only 6p 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
65 and the resistors R3 to R10, the amplifier 559p of FIG.
Are configured.

The amplifier 566 adds the command signal 562p to the difference signal of the differential amplifier 565, and has a resistor R1.
1 to R14 form the adding circuit 563p shown in FIG. The resistors R15 and R16 and the capacitor C1 are well-known phase advance circuits, which correspond to the compensating circuit 560p in FIG. 15 and stabilize 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 coil 552p is generated, and the correction lens 545 is displaced. The drive amplifier 567, the resistor R17 and the transistors TR1 and TR2 form a drive circuit 561p shown in FIG.

The addition amplifier 568 obtains the sum of the outputs of the current-voltage conversion amplifiers 563a and 563b (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. 15).

The light emitting element 556p is extremely unstable in temperature and the like, and the amount of light projected changes.
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.

FIG. 17 is a diagram showing the structure of the above-mentioned correction optical mechanism using a variable apex angle prism.

In FIG. 17, 570 has a high refractive index,
For example, it is a silicon-based liquid, and two flat glass 57
It is sealed without bubbles by 1p and 571y and a polyethylene film 572. The flat glass 571p is held by the pitch holding frame 573p, and the pitch holding frame 573 is held.
p is rotatably fixed around the pitch shaft 574p. The flat glass 571y is held by a yaw holding frame 573y, and the yaw holding frame 573y is fixed around a yaw shaft 574y.

The pitch and yaw holding frames 573p and 573y are respectively provided with a pitch coil 575p and a yaw coil 575y, and these coils are fixed pitch and yaw.
Magnets 576p, 576y, pitch, yo-yoke 5
Since it is placed in the closed magnetic circuit formed by 77p and 577y,
By supplying currents to the pitch and yaw coils 575p and 575y, respectively, the pitch and yaw holding frames 573p and 573y are rotationally driven around the pitch and yaw axes, respectively.

Further, the pitch and yaw holding frames 573p, 573
Displacement detection light receiving element 5 is attached to each of arms 578p and 578y of y.
79p and 579y are attached to the infrared light emitting elements 580p and 580y, which are fixed, to holes 581p,
Rotation around the pitch axis 574p and the yaw axis 574y is detected by the squeezed light beam radiated through 581y. Known position control is also performed between the displacement detection light receiving elements 579p and 579y and the pitch and yaw coils 575p and 575y. This has been described in the slide type correction optical mechanism, and a description thereof will be omitted.

In the above structure, the pitch holding frame 5
When 73p rotates around the pitch axis and the flat glass 571p tilts around the pitch axis 574p, the liquid 57 having a high refractive index is obtained.
The ray passing through 0 is decentered in the direction of arrow 546p,
When the yaw holding frame 573y rotates around the yaw axis and the flat glass 571y tilts around the yaw axis 574y, the light beam is eccentric in the direction of arrow 546y.

[0065]

When the image stabilization system configured as described above is used to suppress camera shake, other functions of the camera may deteriorate the image stabilization accuracy.

For example, when the photographer holds the camera and presses the release button aiming at the subject, the operation of pressing the release button (the operation of pushing down the release button with the finger) is extremely large when the release button is heavy. I know that it becomes. Then, in the case of such a large shake, the image stabilization system cannot completely correct the camera shake, so that sufficient image stabilization accuracy cannot be obtained.

On the other hand, if the release button is lightened in order to eliminate a large shake at the time of release, it is often inadvertently released in a state of normal use, which is inconvenient.

Therefore, it has been a major problem in mounting the image stabilization system on the camera to make the above two conditions compatible with each other.

An object of the present invention is to provide a camera with an anti-vibration function which can prevent deterioration of the anti-vibration accuracy due to a function other than the anti-vibration system.

[0070]

SUMMARY OF THE INVENTION The present invention is provided with a control means for changing a function of the camera other than the image stabilization system when the image stabilization system is activated, and when the image stabilization system is activated, a normal second film exposure is performed. In addition to the switches, only the first film exposure switch for vibration control, which is turned on by a light pressing operation, is operated, and various AF modes are used.
Of the modes, the selection of the AF mode in which the lens is repeatedly started and stopped is prohibited, the driving speed of the mirror for switching the optical path is switched to the low speed side, and the acceleration and deceleration when the lens is started and stopped. I try to loosen.

[0071]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a schematic structure of a camera with an image stabilizing function according to a first embodiment of the present invention. The difference from the image stabilizing system shown in FIG. The first release button 11) is provided.

The first release button 11 is a release button (hereinafter referred to as a second release button) attached to a camera body that is normally used (when the image stabilization is off).
The pressing force for exposing the film is much lighter than that of No. 12, and it is possible to shoot with a slight finger movement.

Further, the first release button 11 is arranged near the center of gravity when the image stabilization system is attached to the camera body, and the camera and lens when the first release button 11 is pushed in The posture change is small, and in combination with the light release described above, the blur during the release operation is extremely small.

The signal in which the first release button 11 is pushed is input to the camera microcomputer controlling the shutter via the analog switch 13 only when the image stabilization switch 14 is turned on, and the film is exposed. Also, when the anti-shake switch 14 is turned off, the signal in which the second release button 12 is pushed is input to the camera microcomputer through the analog switch 13 and the film is exposed. ..

Therefore, the first release button 11 does not work in the case of normal photographing without using the anti-vibration system,
There is no possibility of accidentally touching the first release button 11 to release. Further, when the image stabilization system is in operation, the exposure is long and the exposure is long, and the object is carefully aimed and released. Therefore, even if the first release button 11 is light, no inconvenience occurs.

As described above, by providing the lighter first release button 11 which works only at the time of the vibration proof, the large shake at the time of the release operation is eliminated, the vibration proof accuracy is secured, and when the vibration proof is turned off, It is possible to prevent the first release button 11 from being inadvertently touched to take a picture by not operating the first release button 11.

In FIG. 1 (a), the second release button 12 does not operate when the image stabilization is on, but the first release button 11 does not operate only when the image stabilization is off. Alternatively, when the image stabilization is turned on, both the first and second release buttons may be configured to work, for example, as shown in FIG.
When the slide type anti-vibration switch 14 is slid in the direction of arrow 15 to turn on the anti-vibration switch, the anti-vibration switch 1
The first release button 11 hidden in 4 may be made to appear.

In addition, the first release button 11 is very lightly pressed in the half-released release state (a state in which exposure to the film is not performed but photometry, distance measurement, and automatic focus adjustment are performed) and release release state. In consideration of the difficulty of discrimination, the release half-push operation may be performed by the second release button 12 and the photographing may be performed by the first release button 11.

FIG. 2 is a diagram showing a schematic structure of a camera with image stabilizing function according to the second embodiment of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals.

In this embodiment, a release button dedicated to image stabilization is not provided, but the release button 12 is pressed to
Half-pressed state (when the section 17 is closed and the signal is input to the camera microcomputer, photometry, distance measurement, and automatic focus adjustment are performed)
Then, the release button is pushed in to close the section 18, and when the section 18 is further pressed, the section 19 is closed.
A signal for closing 19 is input to the camera microcomputer through the analog switch 13, and when the image stabilization switch 14 is on, the analog switch 13 connects the section 18 and the camera microcomputer, and when the image stabilization switch 14 is off. The analog switch 13 connects the section 19 and the camera microcomputer.

In this way, when the image stabilization is turned on, the exposure to the film can be performed by simply pressing the release button 12 halfway and then lightly, so that the large shake during the release operation is eliminated, and when the image stabilization is turned off. If you do not press the release button 12 firmly, you cannot perform exposure on the film.
There is no exposure to the film by touching 2.

According to this structure, since one release button automatically switches the characteristics when the image stabilization is on and when the image stabilization is off, there is an advantage that the photographer does not feel any discomfort. ..

Next, a third embodiment of the present invention will be described below.

Many current AF (single-lens reflex) AF cameras are equipped with two AF methods. One is one-shot AF, which is performed again by pressing the release button halfway and then focusing again by AF operation.
It is a method that does not operate, and still life photographs such as scenery and photos
This is convenient when doing caslocks. The second is Servo AF
The AF operation is repeated while the release button is half-pressed, which is a convenient mode for shooting moving objects.
The photographer can then select the desired mode.

By the way, since the vibration detecting means such as the angular displacement detecting device and the angular acceleration sensor used in the image stabilizing system is constructed so as to be able to detect an extremely delicate camera shake (vibration), the lens is moved by the AF operation. If the drive is frequently repeated in the optical axis direction, the vibration of the lens starting and stopping will adversely affect the vibration detection sensor, and the camera shake detection accuracy will deteriorate. Therefore, in the case of the servo AF method in which the start and stop are repeated, the vibration isolation accuracy deteriorates. Further, when the lens moves back and forth in the optical axis direction, the center of gravity also changes accordingly, so that the blur tends to increase, which also causes deterioration of the vibration isolation accuracy.

Therefore, when the anti-vibration system is turned on, the one-shot AF is automatically selected.
3 is a third embodiment of the present invention shown in FIG.

In FIG. 3, when the image stabilization switch 14 is turned on, this on signal is input to the camera microcomputer 31 and the one-shot AF 33 is forcibly selected.

With this structure, the servo A
It is possible to prevent shooting with anti-vibration shooting without noticing the F mode.

FIG. 4 is a diagram showing a schematic structure of a camera with a vibration isolation function according to the fourth embodiment of the present invention, which is a structure obtained by modifying a part of the third embodiment.

When the anti-vibration switch 14 is turned on, the lens drive state is set to the 36 side based on the lens drive distance information 34 in the camera microcomputer 31, and the start 38a and stop 38b are gradually accelerated. The AF operation is performed via 37 to reduce the vibration input to the vibration detecting means when the lens is started and stopped to reduce the deterioration of the image stabilization accuracy. Further, when the anti-vibration switch 14 is turned off, the lens driving state is set to the 35 side so that the lens can be quickly started and stopped.

As described above, AF is activated when the image stabilization system is turned on.
The driving method is changed so that the vibration input to the vibration detecting means is minimized to eliminate the deterioration of the vibration isolation accuracy.

FIG. 5 is a view showing the schematic arrangement of a camera with image stabilizing function according to the fifth embodiment of the present invention.

The single-lens reflex camera has a mirror for switching between the optical path for guiding the subject image to the film surface and the optical path for guiding the subject image so that the photographed object image can be confirmed as it is in the finder. And
The mirror guides the subject image to the viewfinder when aiming at the subject, and to the film surface during shooting.

By the way, the optical path switching by this mirror is usually performed by driving the mirror with a motor, but when the mirror is driven by this motor, the mirror is dead. When reaching the point (mirror-up state: forming an optical path that guides the subject to the film surface) and when the mirror reaches bottom dead center (mirror-down state: forming an optical path that guides the subject to the viewfinder) ), The mirror collides with the stopper and makes a loud impact noise. Then, the vibration at this time is extremely large, which adversely affects the vibration detection sensor as in the servo AF described above and deteriorates the vibration isolation accuracy.

In FIG. 5, in order to solve the above problem, the collision of the mirror 45 and the stopper (not shown) is moderated when the vibration isolation system is turned on.

The mirror 45 is driven by the motor 41, and the driving means 44 of this motor 41 is provided with means 42 for driving the mirror 45 at high speed and means 43 for driving at low speed. When the anti-vibration system is off, the mirror 45 is driven at high speed to switch the optical path quickly, and when the anti-vibration system is on, the anti-vibration switch 14 is input to the analog switch 13, and the motor 41 is driven at low speed by the means 43 for low speed drive. To be done.

Therefore, the vibration of the mirror 45 colliding with the stopper becomes small, and the vibration isolation accuracy does not deteriorate.

In the fourth and fifth embodiments described above, when the image stabilization system is turned on, the functions of the AF mechanism and the mirror mechanism are changed and the operation thereof is somewhat delayed. In the case of shooting that seems to work, the shooting is originally aimed at the subject, so it does not matter even if the response of the camera function is somewhat delayed.

(Modification) In the fifth embodiment, when the vibration proof system is turned on, the mirror 45 is slowly driven to reduce the impact. However, the invention is not limited to this, and the mirror 45 is driven at a high speed to stop. -Blade with the motor 41 immediately before the collision with
You may slow down by slowing down.

Regarding the functions other than the image stabilization system which are changed when the image stabilization system is activated, the release button, the AF mechanism and the mirror mechanism have been described in the first to fifth embodiments. Needless to say, it is possible to stabilize the maintenance of the vibration isolation accuracy by using it.

Further, the present invention is not limited to the still camera, and for example, the case of "moderating the start and stop of the lens in the optical axis direction during the AF operation during the image stabilization operation" described in the fourth embodiment is prevented. It may be applied to a video camera equipped with a shaking system.

[0102]

As described above, according to the present invention,
When the image stabilization system is operating, a control means for changing the function of the camera other than the image stabilization system is provided, and when the image stabilization system is operating, it is turned on by a light pressing operation provided in addition to the normal second film exposure switch. Only the first film exposure switch dedicated to image stabilization is made to function, or the selection of the AF mode in which the lens is repeatedly started and stopped among various AF modes is prohibited, or the optical path switching is selected. Switching the driving speed of the mirror to the low speed side, starting the lens,
The acceleration and deceleration when stopped is slowed down. Therefore, it is possible to prevent deterioration of the vibration isolation accuracy due to a function other than the vibration isolation system.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a camera with a vibration isolation function according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a camera with image stabilizing function according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a camera with image stabilizing function according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a camera with a vibration isolation function according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a camera with anti-vibration function according to a fifth embodiment of the present invention.

FIG. 6 is a perspective view showing a schematic configuration of a conventional vibration isolation system.

FIG. 7 is a plan view showing an angular displacement detection device which is one of conventional vibration detection means.

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

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

10 is a cross-sectional view taken along line BB of FIG.

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

FIG. 12 is an exploded perspective view showing a configuration of a servo angular accelerometer which is one of conventional vibration detecting means.

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

FIG. 14 is a circuit diagram specifically showing the electrical configuration of FIG.

15 is a diagram showing a mechanical and electrical configuration of a correction optical mechanism in the image stabilization system of FIG.

16 is a circuit diagram specifically showing the electrical configuration shown in FIG.

17 is a perspective view showing another example of the correction optical mechanism in the image stabilization system of FIG.

[Explanation of sign]

 11 First Release Button 12 Second Release Button 13 Analog Switch 14 Anti-Vibration Switch 17-19 Contact Piece 31 Camera Microcomputer 41 Motor 44 Drive Means 45 Mirror 63p, 63y Angular Displacement Detection Device 66 Correction Optical Mechanism 67p, 67y drive unit 68p, 68y correction optical position detection sensor

Claims (6)

[Claims] 1. A correction optical unit which is disposed in a lens barrel for holding a lens group and decenters an optical axis of the lens group,
Vibration detecting means for detecting vibration applied to the lens barrel,
In a camera with an anti-vibration function having an anti-vibration system having a drive means for displacing the correction optical means relative to the lens barrel based on the anti-vibration output from the vibration detection means, the anti-vibration system operation At times, a camera with an anti-vibration function is provided with control means for changing functions other than the anti-vibration system of the camera. 2. In addition to a normal second film exposure switch, a first film exposure switch dedicated to image stabilization is provided, and the second film exposure switch is provided in the control means when the image stabilization system is operating. 2. The camera with anti-vibration function according to claim 1, further comprising switching means for disabling the switch for use. 3. The first film exposure switch is the second film exposure switch.
3. The switch which is turned on by a light pressing operation as compared with the film exposure switch of claim 2.
Camera with anti-vibration function as described. 4. An AF mode selection means is provided in the control means for prohibiting selection of an AF mode in which the lens is repeatedly started and stopped among various AF modes when the image stabilization system is operating. The camera with an anti-vibration function according to claim 1, which is provided. 5. The control means comprises speed switching means for switching a driving speed of a mirror to a low speed side for switching an optical path for guiding a subject image to a film surface and an optical path for guiding an eyepiece surface when the image stabilization system is operated. The camera with an anti-vibration function according to claim 1, 2, or 4. 6. The control means is provided with drive control means for gently accelerating and decelerating the lens when the image stabilization system is activated. Alternatively, the camera with a vibration isolation function described in 5.