JPH06118493A - Image blurring correcting device - Google Patents

Abstract

PURPOSE:To prevent a waste of electric power caused by the forgetting of turning off a power source for correcting image blurring and the damage and breakage of components of the device at the time of carrying. CONSTITUTION:The device is provided with loading/unloading discriminating means 107, 114c and 114d for discriminating whether or not an image blurring correcting device is loaded on an optical equipment and a locking commanding means 107 for commanding a locking means to lock a correcting optical means 104 at a prescribed position in the case of discriminating by the loading/ unloading discriminating means that the image blurring correcting device is unloaded from the optical equipment, and when it is discriminated that the image blurring correcting device is unloaded from the optical equipment, the correcting optical means is forcibly locked by the locking means at the prescribed position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects shake such as camera shake and drives correction optical means based on the shake signal,
The present invention relates to an improvement in an image blur correction device that corrects image blur caused by the blur.

[0002]

2. Description of the Related Art Conventionally, there has been proposed an apparatus for correcting image blur of an optical system such as a camera, that is, for stabilizing an image by suppressing vibration due to camera shake. This is generally composed of a sensor that detects vibration, a correction optical system that performs correction so as not to cause image shake in accordance with a signal from the sensor, and the like.

This image shake correction apparatus detects shake vibration of a camera (usually, tilt vibration around two axes perpendicular to the photographing optical axis) by a sensor as an acceleration signal or a speed signal,
The signal processing system is configured to perform integration, if necessary, to convert the signal into a velocity signal or a displacement signal, and drive the correction optical system in the vibration suppressing direction in response to the converted signal. .

When performing image blur correction, the correction optical system swings the optical system in the radial direction, or the optical system is perpendicular to the photographing optical axis.
A feedback system control mechanism configured to rotate about an axis and thereby suppress vibration of an image formed is configured.

When such an image blur correction device is applied to a single-lens reflex camera, the image blur correction device is built in the interchangeable lens side or in the form of an adapter inserted between the camera body and the interchangeable lens.

FIG. 8 shows an example of such an image blur correction device, which is driven in two directions [pitch (P) and yaw (Y) directions] orthogonal to each other and orthogonal to the optical axis. However, only the pitch direction will be described because the configuration is the same in both directions.

In FIG. 8, a correction lens holding frame 701 is provided.
Is connected to the pitch slide shaft 7 via the slide bearing 702p.
It can slide on 03P. The pitch slide shaft 703P is attached to the intermediate arm 704.

Next, the driving force generating mechanism of the correction lens holding frame 701 will be described.

The correction lens holding frame 701 has a coil 705.
P is attached, and the yoke 707 is attached to the fixed frame 706.
The magnetic circuit composed of P and the permanent magnet 708P is fixed. By energizing the coil 705P, the correction lens holding frame 701 is driven in the pitch direction.

Next, the displacement detection mechanism of the correction lens holding frame 701 will be described.

Hole 7 provided in correction lens holding frame 701
A slit 710P, a condenser lens 711P, and an infrared light emitting diode (hereinafter referred to as IRED) 712P are attached to 09P. Further, a light receiver (hereinafter referred to as PSD) 7 is provided on the fixed frame 706 facing the IRED 712P.
13P is installed. Then, the near-infrared light projected from the IRED 712P passes through the slit 710P and P
The displacement of the correction lens holding frame 701 can be detected by being projected on the SD 713P and the PSD 713P outputting a signal according to the position of the light.

Here, the output of the PSD 713P is fed to the amplifier 7
Amplify at 14P and pass through the drive circuit 715P to coil 70
When input to 5P, the correction lens holding frame 701 is driven and the output of the PSD 713P changes. This is a closed system shown by the solid line, and is stable at the point where the output of the PSD 713P becomes zero (neutral point). When the output of the shake sensor 716P corresponding to the shake amount is added to such a system, the correction lens holding frame 701 is driven by this signal, and acts to correct the image shake.

Image blur correction is performed using such a device. However, when image blur correction is not performed, it is necessary to fix (lock) the correction optical system electrically or mechanically at a predetermined position. There is. For example, considering the carrying of the camera, if it is not locked, there is no force to suppress the movement of the correction optical system in the plane perpendicular to the optical axis, and the vibration due to carrying carelessly. This is because rocking causes noise to be generated due to collision with other peripheral members, and further damage or damage to these components due to impact.

Conventionally, as such a locking means, one that is electrically or mechanically known is known. The electric lock means is to drive a correction optical system so that a fixed signal is input so that the correction optical system comes to a fixed position. However, from the viewpoint of power saving, such an electric lock is used in recent image shake correction apparatuses. The mainstream is one that has a mechanical locking means rather than a locking means.

Here, the mechanism of the mechanical locking means will be described.

In FIG. 8, the correction lens holding frame 701 is provided with a conical concave portion 717 as an engaged portion, and when the plunger 719 is energized, the conical convex portion 718 which is the engaging portion is engaged. It engages (locks) with the recessed part 717 which is a joining part (direction opposite to the arrow 720). As a result, the pitch and yaw movements of the correction lens holding frame 701 can be restricted and held in the locked state.

When releasing the lock, the plunger 719 is de-energized and the conical projection 718 is moved to the arrow 72.
Move in the 0 direction. As a result, the convex portion 718 is separated from the conical concave portion 717 that is the engaged portion, and the correction lens holding frame 7
01 is in an unlocked state in which it can be freely driven in a plane orthogonal to the optical axis.

[0018]

However, the mechanical locking means as described above has the following problems.

For example, in an interchangeable lens for a single-lens reflex camera with a built-in image blur correction device, which is supplied from a power source different from the power source of the camera body, forget to turn off the power source for image blur correction and replace it during image blur correction operation. If the lens is removed from the camera body, it will not be locked, so it will be shaken carelessly by the vibration caused by carrying, noise will be generated by collision with other surrounding members, and further damage to these components due to impact ， It can happen that it is damaged. Further, if the image blur correction operation is continued during that time, power will be wasted.

(Object of the Invention) An object of the present invention is to prevent the image shake from being wasted due to forgetting to turn off the power supply for image shake correction, and to prevent damage or damage to the components of the apparatus during carrying. It is to provide a device.

[0021]

SUMMARY OF THE INVENTION According to the present invention, an attachment / detachment discriminating means for discriminating whether or not the image blur correction device is attached to an optical device, and the image blur correction device is transferred from the optical device by the attachment / detachment discrimination means. When it is determined that the image blur correction device is removed from the optical device, the lock device is provided with a lock instructing device that gives an instruction to lock the correction optical device at a predetermined position. In addition, the correction means is forcibly locked at a predetermined position by the lock means.

[0022]

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 an example in which the image blur correction device according to the first embodiment of the present invention is arranged on the interchangeable lens side of a single lens reflex camera.

In FIG. 1, 108 is an interchangeable lens 101.
This is an image shake correction apparatus built in the image forming apparatus, and includes an image shake correction control unit 106 that performs an image shake correction operation, and an image shake correction CPU 107 that manages the start and stop of the operation of the image shake correction control unit 106.

The shake correction control unit 106 performs a feedback control based on a signal from the shake detection sensor 102 and the shake detection sensor 102 for detecting shake.
03, a shake correction drive system 104 including a correction optical system that performs actual shake correction operation according to a control signal from the signal processing system 103, and a lock control system 105 that locks the shake correction drive system 104 at a fixed position.

An in-lens power source 100 is built in the interchangeable lens 101. Examples of power sources include lithium batteries for cameras, alkaline manganese dry batteries, and Ni-C
d batteries are used. Then, power is supplied to the image blur correction device 108 from the in-lens power supply 100.

Reference numeral 109 is a lens CPU, and contacts 114c (for clock signal) for communication from the camera body side, 11
4d (camera main body → for lens signal transmission) is received, and the focus drive system 110, the zoom drive system 111, and the aperture drive system 112 are operated according to the command value. In addition, the lens CPU 109 is the interchangeable lens 10
The state within 1 (zoom position, focus position, state of aperture value, etc.) and information about the lens (open aperture value, focal length, data required for distance measurement calculation, etc.) are also contact 114e for communication (interchangeable lens → It is also transmitted to the camera body 115 side (for camera body signal transmission).

The focus drive system 110 includes a lens C.
Focusing is performed by driving a lens for focus adjustment according to a command value from the PU 109. Zoom drive system 111
Drives the lens barrel so as to change the focal length of the lens when a command value from the lens CPU 109 or a switch (not shown) is pressed by the photographer. The diaphragm drive system 112 performs an operation of diaphragming the diaphragm to a set position or returning to the open state according to a command value from the lens CPU 109.

The lens CPU 109, the focus drive system 110, the zoom drive system 111, and the diaphragm drive system 112 constitute a lens electric system 113. For the lens electric system 113, mount Vdd contacts 114a, G
Power is supplied from the power supply 122 in the camera body through the ND contact 114b.

In the camera body 115, as the camera body electrical system 121, a photometry unit 116, a distance measurement unit 117, a shutter unit 118, other control system 119, and management and exposure of the start and stop of these operations. The CPU 120 of the camera body for performing calculations and distance measurement calculations is built in. The power supply to the electric system 121 in the camera body is also supplied from the power supply 122 inside the camera body.

Reference numeral 123 is a switch (SW1) for photometry and distance measurement, and 124 is a release switch (SW2). These are generally two-step stroke switches, and the switch 123 is the first stroke of the release button.
Is turned on, and the switch 124 is turned on in the second stroke. Reference numeral 125 denotes an exposure mode selection switch (SWM), and the exposure mode can be selected only by turning the switch 125 on and off, or by simultaneously operating the switch 125 and other operating members. Reference numeral 126 denotes a switch (SWIS) for selecting an image blur correction (hereinafter abbreviated as IS) operation, and I
When selecting the S operation, the switch 126 is turned on. A display unit 127 displays information such as aperture value, shutter speed, and selected mode.

Here, the switch S in the camera body 115
When the WIS is ON, the IS start command 128 is periodically transmitted from the camera body 115 to the interchangeable lens 101 side through the electric contact 114d, and when the WIS is OFF, nothing is transmitted. Consider the case. In addition,
Exposure control (A
This is because communication of E) and focus adjustment control (AF) must be performed.

In the above structure, when the interchangeable lens 101 is detached from the camera body 115 during the IS operation,
The interchangeable lens 101 side cannot receive the IS start signal 128 that is periodically transmitted. Then, shake correction CP
If U107 does not receive the IS start signal for a certain period of time,
Immediately, the lock control system 105 is driven to mechanically lock the shake correction drive system.

The operation at this time will be described with reference to the flow charts of FIGS. 2 shows the CPU of the camera body.
FIG. 3 is a flowchart showing the operation of the shake correction CPU 107.

First, the operation of the camera body CPU 120 will be described with reference to the flowchart of FIG. "Step 1" The state of the switch SW1 is detected, and when the switch SW1 is turned on, the process proceeds to step 2. "Step 2" Communication with the interchangeable lens 101 is performed. This communication is for transmitting information necessary for performing AE and AF, and the lens CPU 109 is the camera body CPU.
When the communication command is transmitted to 120, the lens CPU 120 transmits information such as the focal length, the AF sensitivity, and the open F number. [Step 3] ON / OFF of the switch SWIS is detected. As a result, when it is ON, the process proceeds to step 4, where O
If FF, go to step 5. [Step 4] An IS start command is transmitted to the interchangeable lens 101 side. "Step 5" The AE and AF subroutines are executed. "Step 6" The lens is driven. If an interrupt due to the turning on of the switch SW2 occurs during execution of this operation, the release is performed, but the description thereof will be omitted.

Since the flow of steps 1 to 6 is repeatedly executed in the cycle T, the IS start command is also transmitted in each cycle T.

Next, the operation of the shake correction CPU 107 will be described with reference to the flowchart of FIG. “Step 11” The reception of the IS start command shown in step 4 of FIG. 2 is detected. When the IS start command is received, the process proceeds to step 12. [Step 12] Here, the lock of the shake correction drive system 104 is released via the lock control system 105. "Step 13" A known IS operation is started. "Step 14" Start the built-in timer. This timer is for compensating that the IS start command is not always transmitted, and corresponds to the transmission cycle T of the IS start command. "Step 15" Wait for the period T and return to step 11.

Then, in step 11, as described above, it is determined whether or not the IS start command is received during these operations. Here, when the IS start command is received, the same operation as described above is repeated, but when the IS start signal is not received, the process proceeds from step 11 to step 16. "Step 16" The IS operation is stopped and the process proceeds to step 17. [Step 17] The shake correction drive system 104 is locked via the lock control system 105. Then, the process returns to step 11 and waits for the IS start command again.

According to the first embodiment, the predetermined period T
The IS start command is received every time, and if the IS start command is not received during this period, it is determined that the interchangeable lens 101 has been removed, and the shake correction drive system 104 is automatically locked. I have to. Where T is actually several meters
That is, the shake correction drive system 104 is locked almost at the same time when the interchangeable lens 101 is removed.

Therefore, if the interchangeable lens is accidentally detached and the lens is carried in that state without being locked, it collides with peripheral members due to vibration, damage or damage to these components due to the collision, and when photographing is impossible. It is possible to prevent power consumption due to useless IS operation.

(Second Embodiment) FIG. 4 is a block diagram showing an example in which the image blur correction device according to the second embodiment of the present invention is arranged on the interchangeable lens side of a single lens reflex camera.
The same parts as are denoted by the same reference numerals.

In the second embodiment, as shown in FIG. 4, the power line in the camera body is also connected to the shake correction CPU 107 so that the interchangeable lens 101 is detached from the camera body 115 or the power source 122 in the camera body. It is configured to be able to detect that the is turned off. Although the shake correction operation selection switch (SWIS2) is attached to the interchangeable lens 101 side in FIG.
It may be attached on the side.

When the interchangeable lens 101 is detached from the camera body 115 or when the power source 122 in the camera body is turned off, the power source 122 in the camera body supplied from the camera body 115 to the interchangeable lens 101 side is replaced by the interchangeable lens 10.
On the 1st side, the interchangeable lens attachment / detachment determination is performed by utilizing the change from the high level (H) to the low level (L). That is, when the shake correction CPU 107 detects that the power supply line has changed from the high level to the low level, the shake correction CPU 107 determines that the interchangeable lens 101 has been removed from the camera body 115, and the lock control system 10
The shake correction drive system 104 is brought into the locked state via 5.

The operation at this time will be described with reference to the flowchart of FIG. "Step 21" ON / OFF of switch SWIS2
Detect. As a result, if it is ON, the process proceeds to step 22, and if it is OFF, the process proceeds to step 25. [Step 22] H / L detection of the power supply line in the camera body is performed. As a result, if H, go to step 23,
If L, go to step 25. [Step 23] The shake correction drive system 104 is unlocked via the lock control system 105, and the process proceeds to step 24. "Step 24" The IS operation is executed, and then the process returns to step 21.

In step 21 above, the switch SWI
When S2 is OFF or in step 22, the power line is L
When it is detected that step 2 is performed as described above.
Go to 5. "Step 25" The IS operation is stopped and the process proceeds to step 26. [Step 26] The shake correction drive system 104 is locked via the lock control system 105. Then, the process returns to step 21.

According to the second embodiment, when it is detected that the power line in the camera body has become L, it is determined that the interchangeable lens 101 has been removed, and the shake correction drive system 104 is automatically operated. Since the locking is performed, as in the case of the first embodiment, a collision with a peripheral member due to a vibration caused when the interchangeable lens is unintentionally detached and carried in that state without being locked, and these collisions Damage or breakage of components,
Then, it becomes possible to prevent power consumption due to useless IS operation when shooting is impossible.

(Third Embodiment) FIG. 6 is a block diagram showing an example in which an image blur correction device according to a third embodiment of the present invention is arranged on the interchangeable lens side of a single lens reflex camera.
The same parts as those in FIG. 4 are designated by the same reference numerals.

In the third embodiment, as shown in FIG. 6, a lens attachment / detachment detection switch 131 is provided in the mount portion as means for determining attachment / detachment of the interchangeable lens 101 from the camera body 115. Then, when the lens attachment / detachment detection switch 131 detects that the interchangeable lens 101 is detached from the camera body 115, the shake correction CPU 107 immediately locks the shake correction drive system 104 via the lock control system 105. I have to.

The operation at this time will be described with reference to the flowchart of FIG. "Step 31" ON / OFF of switch SWIS2
Detect. As a result, if it is ON, the process proceeds to step 32, and if it is OFF, the process proceeds to step 35. "Step 32" O of the lens attachment / detachment detection switch 131
N / OFF detection is performed. As a result, if it is ON, the process proceeds to step 33, and if it is OFF, the process proceeds to step 35. "Step 33" The shake correction drive system 104 is unlocked via the lock control system 105, and the process proceeds to step 34. "Step 34" The IS operation is executed, and then the process returns to step 31.

In step 31, the switch SWI
When S2 is OFF or when the lens attachment / detachment detection switch 131 is detected to be OFF in step 32, the process proceeds to step 35 as described above. "Step 35" The IS operation is stopped and the process proceeds to step 36. [Step 36] The shake correction drive system 104 is locked via the lock control system 105. Then, the process returns to step 31.

According to the third embodiment, when it is detected that the lens attachment / detachment detection switch 131 is OFF,
Since it is determined that the interchangeable lens 101 has been removed, and the shake correction drive system 104 is automatically locked, as in the first and second embodiments, the interchangeable lens is unexpectedly removed. Preventing collision with surrounding members due to vibration when carried in that state without locking, damage and damage to these components due to the collision, and power consumption due to useless IS operation when shooting is not possible Is possible.

(Modification) In this embodiment, an example in which the image blur correction device is incorporated in the interchangeable lens has been shown, but the image blur correction device is not in the interchangeable lens, and like the extender,
It may be in the form of an adapter that is inserted between the camera body and the main lens, or an accessory that is inserted into a conversion lens that is mounted in front of the interchangeable lens. Further, the present invention may be applied to a lens-integrated camera in which a lens body and a camera body are integrated, an image blur correction device detachable from an optical device other than the camera, and the like.

Further, in the present embodiment, an image blur correction device using a correction optical means of a type in which an optical member is moved in parallel in a plane substantially perpendicular to the optical axis to change a light flux to perform blur correction. However, the present invention is not limited to this. For example, a variable vertical angle prism that changes the passing light flux by enclosing a fluid between transparent plates and changing the vertical angle of the transparent plates, or an optical member with respect to the optical axis. The same effect can be obtained even when applied to an image blur correction device using a correction optical unit of a type that changes the light flux by inclining.

[0054]

As described above, according to the present invention,
An attachment / detachment determination unit that determines whether or not the image blur correction device is attached to an optical device, and if the attachment / detachment determination unit determines that the image blur correction device has been detached from the optical device, the lock unit corrects the image blur correction device. A lock instructing means for instructing to lock the optical means at a predetermined position is provided, and when it is determined that the image blur correction device is detached from the optical device, the lock means causes the correction optical means to move to the predetermined position. I'm trying to force lock.

Therefore, it is possible to prevent waste of electric power due to forgetting to turn off the power source for image blur correction, and damage or damage to the constituent members of the apparatus during carrying.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example in which an image blur correction device according to a first embodiment of the present invention is arranged on the interchangeable lens side of a single-lens reflex camera.

FIG. 2 is a flowchart showing an operation on the camera body side of FIG.

FIG. 3 is a flowchart showing an operation of the image blur correction device on the interchangeable lens side of FIG.

FIG. 4 is a block diagram showing an example in which an image blur correction device according to a second embodiment of the present invention is arranged on the interchangeable lens side of a single-lens reflex camera.

5 is a flowchart showing the operation of the image blur correction device on the interchangeable lens side of FIG.

FIG. 6 is a block diagram showing an example in which an image blur correction device according to a third embodiment of the present invention is arranged on the interchangeable lens side of a single-lens reflex camera.

7 is a flowchart showing the operation of the image blur correction device on the interchangeable lens side of FIG.

FIG. 8 is a mechanism diagram showing a conventional image blur correction device.

[Explanation of symbols]

 102 shake detection sensor 103 signal processing system 104 shake correction drive system 105 lock control system 107 shake correction CPU 108 shake correction device 114a to 114e contacts 131 attachment / detachment detection switch

Claims (3)

[Claims] 1. A shake detecting means for detecting a shake condition,
An image blur correction device that is driven based on the output of the blur detection unit and includes a correction optical unit that corrects an image blur caused by the blur and a lock unit that locks the correction optical unit at a predetermined position. In the optical device to which the image blur correction device is attachable / detachable, the attachment / detachment determination means for determining whether or not the image blur correction device is attached, and the attachment / detachment determination means removes the image blur correction device from the optical device. An image blur correction device, characterized in that, when determined, the lock means is provided with a lock instruction means for instructing to lock the correction optical means at a predetermined position. 2. The attachment / detachment determination means is means for determining whether or not the image blur correction device is attached to the optical device, based on a state of a communication line between the optical device and the image blur correction device. The image blur correction device according to claim 1. 3. The attachment / detachment determining means determines whether or not the image blur correction device is attached to the optical device, depending on whether the image blur correction device is attached to the camera body or not. The image blur correction apparatus according to claim 1, wherein the image blur correction apparatus is a unit that determines the state by detecting the state.