JP2002131800A - Shake correcting camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a shake correcting camera capable of preventing an action time lag or power consumption more than necessary and being excellent in handleability. SOLUTION: The camera, wherein influence by camera shake is corrected by detecting the camera shake occurring in the camera, is equipped with a shake correction optical part 14 for correcting the camera shake, an optical part state detection part 15 detecting the action state of the optical part 14, a photographing start designation part 35 to be operated in order to designate the photographing start action of the camera, and a centering judging part 17 judging whether or not the centering action of the optical part 14 is to be performed based on output from the detection part 15 in the case of operating the designation part 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a shake correction camera.

[0002]

2. Description of the Related Art A camera that detects a camera shake occurring in a camera and corrects the influence of the camera shake has been conventionally known. For example, Japanese Patent No. 2752073 discloses the second patent.
It discloses that the centering operation of the correction optical member is performed in conjunction with the 2R switch ON in order to effectively utilize the shake correction range at the start of exposure after the release (2R) switch is turned ON. This makes it possible to perform shake correction evenly in the ± XY directions of the film surface.

[0003]

However, in the above-mentioned Japanese Patent No. 2752073, the centering operation is performed in synchronization with the 2R switch ON regardless of the position of the correction optical member. The time required for driving is required.

The present invention has been made in view of such problems, and an object of the present invention is to realize an easy-to-use image stabilization camera which prevents an operation time lag and unnecessary power consumption. It is in.

[0005]

According to a first aspect of the present invention, there is provided a camera for detecting a camera shake occurring in a camera and correcting the influence of the camera shake. A shake correction member, a state detection unit that detects an operation state of the shake correction member, a shooting start instruction unit operated to instruct a shooting start operation of the camera, and a state in which the shooting start instruction unit is operated. A determination unit for determining whether or not to perform the centering operation of the shake correction member based on the output of the state detection unit.

According to a second aspect of the present invention, in a camera for detecting a camera shake occurring in the camera and correcting the influence of the camera shake, a camera shake correcting member for correcting the camera shake and an operation state of the camera shake correcting member are described. A state detection unit to detect, a shooting start instruction unit operated to instruct a shooting start operation of the camera, a shooting information storage unit that stores shooting information of the camera,
A determination unit configured to determine whether to perform a centering operation of the shake correction member based on an output of the state detection unit when the imaging start instruction unit is operated and information stored in the imaging information storage unit. .

In a third aspect based on the first or second aspect, the centering operation of the shake correcting member is performed after the operation of the photographing start instruction unit in accordance with the result of the judgment by the judgment unit.

In a fourth aspect based on the second aspect, the information stored in the photographing information storage section is at least shutter speed information and focal length information of the camera.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a basic conceptual diagram of an embodiment of the present invention. The control unit 7 of the present embodiment includes a correction operation unit 16, a centering operation determination unit 18, and a centering determination unit 17. The correction calculation unit 16 outputs the shake information detected by the shake detection unit 12 and the output of the optical unit state detection unit 15 that detects the operation state of the shake correction optical unit 14 as the shake correction member (related to the lens position and the lens operation direction). ) Is calculated based on the information.

The centering judging section 17 receives the output of the optical section state detecting section 15 (information on the lens position and the lens operating direction) and judges whether or not to center the blur correcting optical section 14. Further, the centering determining unit 17 determines whether the blur correction optical unit 14 is based on the shooting information such as the focal length and the shutter speed stored in the shooting information storage unit 30.
It is determined whether or not to perform centering.

The result of the judgment is determined by the centering operation determining unit 1.
8 The centering operation determination unit 18 determines the content of the centering operation and sends it to the correction drive actuator 13 when the imaging start instruction unit (2R switch) 35 is turned on. The correction drive actuator 13 is based on the correction amount calculated by the correction calculation unit 16 and
Centering.

That is, the control unit 7 in the present embodiment
Determines whether to perform the centering operation of the blur correction optical unit 14 based on the output of the optical unit state detection unit 15 when the imaging start instruction unit (2R) 35 is operated.
In addition, the photographing information stored in the photographing information storage unit 30 may be added to the determination as to whether to center the blur correction optical unit 14.

FIG. 2 is a diagram showing a configuration of a main part of the camera of this embodiment. While controlling the entire camera,
A camera preparation unit (1R switch) 34 and a shooting start instruction unit (2R switch) 35 include a camera control unit 21 having a built-in shooting information storage unit 30 that stores shooting information such as a focal length and a shutter speed. , A photographing information notifying section 37 and a centering information notifying section 38 are connected.

The camera control unit 21 is connected to the quick return mirror 22, the shutter device 25, and the lens control unit 41, and controls the operations thereof. 27 is a film.

A lens control unit 41 is connected to the focusing lens 42, the aperture blade 45, and the variable power lens 48, and controls the operations thereof.

Further, the camera control unit 21 is connected to the shake correction control unit 11. The shake correction control unit 11 includes a shake detection sensor (X) 12X and a shake detection sensor (Y) 12 that perform shake detection corresponding to the horizontal axis and the vertical axis of the shooting screen, respectively.
A correction operation unit 16 to which Y is connected, a centering operation determination unit 18, a centering determination unit 17, and a centering operation direction determination unit 19 are provided.

The correction calculation section 16 is connected to a correction encoder (X) 15X, a correction encoder (Y) 15Y, a correction drive actuator (X) 13X, and a correction drive actuator (Y) 13Y. The correction encoder (X) 15X and the correction encoder (Y) 15Y correspond to the optical unit state detection unit 15 in FIG.

The correction drive actuator (X) 13X and the correction drive actuator (Y) 13Y are connected to the centering operation determination unit 18. The correction encoder (X) 15X and the correction encoder (Y) 15Y are connected to the centering determination unit 17. The centering determining unit 17 is connected to the centering operation determining unit 18 and the centering operation direction determining unit 19.

FIG. 3 is an external perspective view of a camera to which the present embodiment is applied. 1 is a camera body, 2 is a taking lens, 3
Is a liquid crystal display section, 4 is a release button, 5 is a flash light emitting section,
Reference numeral 6 denotes a grip unit, and 14 denotes a blur correction optical unit.

FIG. 4 is a diagram showing a configuration of the above-described blur correction optical unit 14. As shown in FIG. In the present embodiment, the parallel glass plate constituting the shake correction optical unit 14 is tilted according to the camera shake state using the gimbal mechanism, and the displacement of the image by the parallel glass plate cancels the displacement of the image due to the shake. It was done. Horizontal axis (X axis direction in the figure, hereinafter simply referred to as X axis)
And the vertical axis (hereinafter simply referred to as Y axis in the Y axis direction in the figure) are the same, so that the horizontal axis (X axis direction)
Only the mechanism for correcting the shake about the Y axis will be described.

The parallel glass plate as the blur correction optical section 14 is held by an inner frame 68. The inner frame 68 is fixed to the rotation shaft 67X and the gear 62X. Further, the inner frame 68 is rotatably held with respect to the outer frame 69. The gear 62X meshes with the worm gore 61X,
A correction drive actuator (X) 13X is connected to the shaft of the worm gear 61X. The rotation of the correction drive actuator (X) 13X is controlled by the worm gear 61X.
Is transmitted to the blur correction optical unit 14 held in the inner frame 68 via the gear 62X and the rotation shaft 67X, and is driven to rotate about the Y axis of the X axis.

The correction drive actuator (X) 13X
A disk 63X having a plurality of slits provided at equal intervals is fixed to the rotation shaft of, and the PI / PR64X is arranged with the disk 63X interposed therebetween. When the correction drive actuator (X) 13X rotates, a pulse signal is generated each time the slit of the disk 63X crosses the PI / PR64X, and the rotation speed of the correction drive actuator (X) 13X is detected based on the pulse signal. The amount of rotation of the parallel glass plate serving as the shake correction optical unit 14 is detected.

The flat portion of the gear 62X has a groove 6
5X is provided, and a pin 66X that fits into the groove 65X is implanted in the outer frame 69, and the rotation range of the gear 62X and the inner frame 68 is regulated by the groove 65X and the pin 66X.

That is, by the forward / reverse rotation of the correction drive actuator 13X, the rotation of the inner frame 68 holding the blur correction optical unit 14 rotates about the X axis around the Y axis via the worm gear 61X and the gear 65X. I do. The rotation of the inner frame 68 about the Y axis is restricted by the pin 66X fitted in the groove 65X, and the rotation of the inner frame 68 is controlled by the PI / PR64X.
The rotation amount is detected by the pulse signal from the disk 63X detected in the step (1). The mechanism for correcting the shake in the Y-axis direction (shake around the X-axis) is exactly the same as that in the X-axis direction.

By the way, the camera shake correcting mechanism is arranged at the upper part and the right part of the camera shown in FIG. 3 because there is a grip 6 on the left side when viewed from the front of the taking lens 2, and this grip 6 is used by the photographer. The part to hold with your right hand, and
Although not shown, it is a portion to be held, such as an auto-focus auxiliary light portion, and although not shown, windows such as an auto-focus auxiliary light portion are often arranged on the left side. Therefore, it is difficult to install the correction mechanism on the left side.

When viewed from the front of the photographic lens 2 of the camera, the lower part has no space in terms of space, and the upper part has room in terms of space for providing a projection for installing the strobe light-emitting unit 5 and the like. It is. Note that the arrangement of the camera shake correction mechanism in the camera body 1 is not limited to the above-described arrangement, and the installation location can be set according to the arrangement relationship of various mechanisms installed in the camera body. is there.

FIG. 5A is a diagram for explaining the camera shake correction range. In FIG. 5A, the vertical axis (X) corresponds to the vertical direction of the screen, and the horizontal axis (Y) corresponds to the horizontal direction of the screen. The outermost line is the correction limit A1. The inside of this line A1 is the range that can be corrected. The thick line in the middle of the figure is a criterion A2 indicating the threshold of whether or not centering is performed. FIG. 5B shows that the criterion A2 is changed according to the focal length. In the case of wide, the frame of the criterion A2 is large and the allowable range is set, and in the case of telephoto, the criterion A2 is set. A small allowable range is set for the frame of A2. FIG. 5C shows that the criterion A2 is changed in accordance with the shutter speed. When the shutter speed is short, the frame of the criterion A2 is large and the permissible range is set. When the shutter speed is long, Is set to a small and narrow allowable range for the frame of the criterion A2. FIG. 5D shows a criterion A2 according to the operation direction of the blur correction optical unit 14, that is, the direction of the lens.
Is changed, and the frame of the criterion A2 is set to be large and ambiguous when going from the periphery to the center. When the frame goes from the center to the periphery, the frame of the judgment criterion A2 is small and the tolerable range is set. Is set.

FIG. 6 is a diagram showing an example of the display in the viewfinder of the camera. Reference numeral 28 denotes a visual field frame, and 29 denotes a distance measuring frame. In the display below the field frame 28, reference numeral 37 denotes a shooting information notification unit, and reference numeral 38 denotes a centering information notification unit. In the centering information notifying section 38, reference numeral 38-1 denotes a display for indicating the presence or absence of a blur correction mode. The display 38-1 turns on when the blur correction mode is set, and turns off when the mode is not the blur correction mode. Reference numeral 38-2 denotes a display for notifying the user of the angle of view change direction at the time of centering, and FIG.

FIG. 7 is a flow chart for explaining the operation of the camera control section 21. First, after performing an initial operation in step S1, a focal length state is checked and stored in step S2.

Next, at step S51, the shutter speed (S
S) Information is read, and in the next step S52, it is determined whether or not the read shutter speed information is shorter than a predetermined second. If YES here, the threshold value TH is incremented in step S53 to increase the frame of the criterion A2, and if NO, the threshold value TH is decremented in step S54 to reduce the frame of the criterion A2.

Next, in step S55, focal length information is read, and in the next step S56, it is determined whether the read focal length information is shorter than a predetermined distance. Where Y
In the case of ES, the threshold value TH is incremented to increase the frame of the criterion A2 (step S57), and NO
In step S58, the threshold value TH is decremented in step S58 to reduce the frame of the criterion A2.

As described above, in this embodiment, the size of the frame of the criterion A2 is increased or decreased based on the shutter speed and the focal length information.

Next, in step S3, it is determined whether the 1R switch is ON. If the 1R switch is ON, AE (SS information storage) operation (step S4 in FIG. 8), A
After the F operation, the lens drive (step S5), the shooting information, and the in-focus notification (step S6) are sequentially performed, the blur detection and the correction operation are started (step S7).

At step S8, the blur detection sensor / encoder information is sampled, and at step S9, a blur detection calculation is performed. Here, the output of the sensor is filtered to remove noise, and the output of a blur detection sensor (here, an angular velocity sensor) is integrated and converted into angular displacement.
In step S10, a difference between the angular displacement and the output of the correction encoder is calculated to calculate a correction target position.
1 outputs the corresponding correction drive signal.

After determining whether or not to perform centering in step S12, a flag is set if the centering is to be performed. Next, it is determined in step S13 whether or not the 2R switch is ON. If it is OFF, it is determined in step S35 whether or not the 1R switch is OFF.
If N, the process proceeds to step S33 in FIG. 9, and if OFF, step S8 and subsequent steps are executed again. When the 2R switch is turned on, the process proceeds to step S14 to turn off the display in the viewfinder, and in the next step S15, it is determined whether or not there is a centering flag. If there is no flag, the process immediately proceeds to step S17 in FIG. 9. If there is a flag, the centering operation is performed in step S16 and the process proceeds to step S17 in FIG.

In step S17, mirror drive and aperture operation are performed, and in the next step S18, an exposure operation is started. Steps S19 to S22 correspond to steps S8 to S11 described above.
Therefore, the description is omitted.

In step S23, it is determined whether or not the proper exposure time has elapsed. If not, the correction operation in steps S19 to S22 is executed again. If the determination is YES, the process proceeds to step S24. In step S24, the exposure operation is completed. Then, in step S25, mirror driving and aperture operation are performed, and in step S26, film winding is performed.
In step S27, a centering operation after photographing is performed.

Next, steps S28 to S31 are executed, which is exactly the same as the correction operation in steps S19 to S22. Then, it is determined in step S32 whether both the 1R and 2R switches have been turned off, and if both switches have not been turned off, the process returns to step S28 to repeat the correction operation. When the 1R and 2R switches are both turned off, the determination in step S32 is YES.
And the process proceeds to step S33. In step S33, a centering operation is performed, and in the next step S34, the blur detection and correction operation is stopped, and thereafter, the process returns to step S2 in FIG.

FIG. 10 is a flowchart showing the details of the centering judgment in step S12 in FIG. First, the correction encoder information is read in step S41, and the correction encoder information read in the next step S42 is compared with a threshold value TH (corresponding to the criterion A2 in FIG. 5).
In step S43, it is determined whether or not the correction lens is within the allowable range based on the comparison result at this time. If YES, the process proceeds to step S44 to clear the centering flag and then proceeds to step S45. In step S45, the centering OFF notification (L
(ED turns off) and returns.

If the determination in step S43 is NO, the flow advances to step S46 to set a centering flag, and the flow advances to step S47. In step S47, 2R
When the switch is turned on, the centering ON is notified (LED is turned on) and the process returns.

FIG. 11 is a flowchart for explaining a modification of the embodiment of FIG. In this embodiment, after the centering flag is set in step S46, the centering ON is notified when the 2R switch is turned on in the next step S47-1, and then the display 38-2 in FIG. Is displayed. Other steps are the same as those in FIG.

FIG. 12 is a flowchart for explaining another embodiment for changing the threshold value TH. First, in step S59, the current information from the correction encoder is read, and in the next step S60, the previous correction encoder information is read. In the next step S61, the current and previous correction encoder information is compared to determine whether or not the operation direction of the blur correction optical unit has changed. If YES, it is determined in step S62 whether the direction is the center direction. I do. If it is oriented toward the center, the threshold value TH is decremented in step S63 and
It moves to 41. If it is not the center direction, the threshold value TH is incremented in step S64, and the process proceeds to step S41. In this way, the size of the frame of the criterion A2 is increased or decreased according to the operation direction of the blur correction optical unit.

According to the above-described embodiment, the blur correction operation is performed in conjunction with the shooting start preparation operation (1R), and the blur correction is performed in conjunction with the shooting start instruction operation (2R) to secure the effective range of blur correction. The determination as to whether or not to perform the centering operation of the optical unit is performed based on the position information of the blur correction optical unit, the shutter speed information, the focal length information, and the operation direction information of the blur correction optical unit.

By performing the execution control of the centering operation of the blur correction optical unit based on the above determination result, the operation time lag and unnecessary power consumption are prevented, and the blur correction effective range is secured as necessary. Therefore, an easy-to-use camera shake correction camera can be realized.

[0045]

According to the present invention, it is possible to provide an image stabilization camera which can prevent an operation time lag and unnecessary power consumption and is easy to use.

[Brief description of the drawings]

FIG. 1 is a basic conceptual diagram of an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a main part of the camera according to the embodiment.

FIG. 3 is an external perspective view of a camera to which the embodiment is applied.

FIG. 4 is a diagram illustrating a configuration of a shake correction optical unit 14;

FIG. 5 is a diagram for explaining a camera shake correction range.

FIG. 6 is a diagram illustrating an example of display in a viewfinder of a camera.

FIG. 7 is a front part of a flowchart for explaining the operation of the camera control unit 21;

FIG. 8 is a middle part of a flowchart for explaining the operation of the camera control section 21;

FIG. 9 is the latter part of the flowchart for explaining the operation of the camera control unit 21;

FIG. 10 is a flowchart showing details of the centering determination in step S12 of FIG. 8;

FIG. 11 is a flowchart for explaining a modification of the embodiment of FIG. 10;

FIG. 12 is a flowchart for explaining another embodiment for changing the threshold value TH.

[Explanation of symbols]

 Reference Signs List 7 control unit 12 shake detection unit 13 correction drive actuator 14 shake correction optical unit 15 optical unit state detection unit 16 correction calculation unit 17 centering determination unit 18 centering operation determination unit 30 shooting information storage unit 35 shooting start instruction unit (2R)

Claims (4)

[Claims] 1. A camera for detecting an effect of a camera shake by detecting a camera shake occurring in the camera, a shake correction member for correcting the camera shake, and a state detection unit for detecting an operation state of the shake correction member. Performing a centering operation of the blur correction member based on an output of the state detection unit when the imaging start instruction unit is operated, wherein the imaging start instruction unit is operated to instruct the imaging start operation of the camera. And a determining unit for determining whether or not the camera shake is determined. 2. A camera for detecting a camera shake occurring in a camera and correcting an influence of the camera shake, a shake correction member for correcting the camera shake, and a state detection unit for detecting an operation state of the shake correction member. An imaging start instruction unit operated to instruct an imaging start operation of the camera; an imaging information storage unit storing imaging information of the camera; and an output of the state detection unit when the imaging start instruction unit is operated. And a determining unit for determining whether to perform a centering operation of the shake correcting member based on information stored in the shooting information storage unit. 3. The camera according to claim 1, wherein a centering operation of the shake correcting member is performed after the photographing start instruction section is operated, according to a result of the determination by the determining section. 4. The camera according to claim 2, wherein the information stored in the photographing information storage unit is at least shutter speed information and focal length information of the camera.