JPH0943659A - Shake correction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten time for calibrating between the position of a shake correction optical system and position detecting output from the shake correction optical system and to shorten time for preparing photographing by making a calibration movable range where the shake correction optical system can be moved to perform calibration smaller than a correction movable range where the shake correction optical system can be moved to perform shake correction in a calibration part. SOLUTION: A shake correction lens 23 is housed in a shake correction lens barrel 51, and the lens barrel 51 is supported in a cantilever state by four flexible supporting bars 52 and moved in a direction nearly orthogonal to an optical axis. The lens barrel 51 is provided with driving range limit parts 53-X-1, 53-X-2, 53-Y-1 and 53-Y-2 on its periphery part, so that the driving range of the lens barrel 51 is limited within a fixed range. In such a constitution, the calibration movable range where the lens 23 can be moved to perform the calibration is made smaller than the correction movable range where the lens 23 can be moved to perform the shake correction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blur correction device for preventing image blur caused by camera shake in a camera or the like.

[0002]

2. Description of the Related Art Conventionally, as a blur correction device of this type, in order to prevent blurring caused by vibration of a camera at the time of photographing, a part of a lens (hereinafter referred to as a blur correction lens) is used as an optical axis It is known to move at right angles.

FIG. 7 is a block diagram showing a camera with a shake correction device according to a conventional example. The CPU 12 is a processing device for controlling the shake correction function as well as the shooting function of the camera such as distance measurement and photometry, and includes the photometry circuit 11, the main switch 13, the half-press switch 14, the full-press switch 15, and the shake detection. Devices 31X, 31Y and distance measuring circuit 41
Outputs from etc. are connected respectively.

The photographing lens 20 is composed of lenses 21, 22, a blur correction lens 23, a focusing lens 24, etc., as surrounded by a broken line in FIG. The blur correction lens 23 is for correcting the blur by changing the optical axis of the taking lens, and is supported so as to be movable in the X-axis and Y-axis directions. The shake correction lens 23 is driven in the X-axis or Y-axis direction by the actuators 36X and 36Y via actuator drive circuits 35X and 35Y based on a shake correction control signal from the CPU 12. The focusing lens 24 is a lens that moves in the optical axis direction for focus adjustment, and based on a focus control signal from the CPU 12, the motor drive circuit 4
Driven by the motor 44 via The lens position detection device 37 (see FIG. 10) includes the shake correction lens 23.
Position sensor 38 for detecting the position of
The outputs from X and 38Y are the lens position detection circuits 39X and 3X.
Each of them is connected to the CPU 12 via 9Y.
The lens position detecting device 47 includes the focusing lens 24.
Is for detecting the position of, and is connected to the CPU 12.

FIG. 8 is a diagram showing in detail a drive device of a shake correction lens according to a conventional example, and FIG. 9 is a view showing a support structure of the shake correction lens. The shake correction lens 23 is driven in the X-axis or Y-axis direction by the actuators 36X and 36Y. The actuator 33X is for driving in the X-axis direction, and includes a moving coil 36X-1 and a magnet 36X-.
2 and the yokes 36X-3 and 36X-4, and a force in the X-axis direction is generated by energizing the moving coil 36X-1. Similarly, the actuator 36Y
Is for driving in the Y-axis direction, and generates a force in the Y-axis direction by energizing the moving coil 36Y-1. As shown in FIG. 9, the shake correction lens 23 is held by a shake correction lens barrel 51, and the shake correction lens barrel 51 is
It is cantilevered by four flexible support rods 52 and can move in a direction orthogonal to the optical axis.

FIG. 10 is a block diagram showing a control system of a blur correction device according to a conventional example. The blur detection device 31
It is for monitoring camera shake motion, and is composed of an angular velocity meter 32 and an integration processing circuit 33. As the angular velocity sensor 32, a piezoelectric vibration type sensor that detects Coriolis force is used. The integration processing circuit 33 time-integrates the output of the angular velocity sensor 32 and converts it into a camera shake angle.

The shake correction control device 11-1 generates target drive position information of the shake correction lens 23 based on the output of the shake detection device 31, and outputs it to the lens drive device 34.
At this time, the servo circuit 11-1a performs phase compensation or the like on the difference between the target drive position information and the current position information of the blur correction lens 23 detected by the lens position detection device 37.

The shake drive unit 34 is a shake correction control unit 1.
The shake correction lens 23 is moved based on the target drive position information from 1-1, and is composed of a drive circuit 35 and an actuator 36. Drive circuit 35
Supplies a drive current to the actuator 36 based on the signal from the servo processing circuit 11-1a. Actuator 3
6 moves the blur correction lens 23 in a plane orthogonal to the optical axis based on this drive current. The movement of the blur correction lens 23 is monitored by the optical lens position detection device 37 and fed back to the servo processing circuit 11-1a.

Next, the lens position detecting device will be described. The lens position detection device 37 includes the shake correction lens 23.
Optical detectors 38 for detecting the position of are provided in the X-axis direction and the Y-axis direction, respectively. Position sensors 38X, 38Y
8, the detection slits 38X-1 and 38Y-1 are attached to the shake correction lens barrel 51 and have elongated holes formed in the X-axis direction or the Y-axis direction, and are attached to the top plate 54, as shown in FIG. Infrared Light Emitting Diode (IRED) 38X
-2, 38Y-2 and attached to the bottom plate 53, IRE
The light projected from D38X-2, 38Y-2 is made incident through the detection slits 38X-1, 38Y-1.
-Dimensional position detection diode (PSD) 38X-3, 38
It is composed of Y-3 and the like. Detection slit 38X-
The movements of 1, 38Y−1, that is, the movements of the blur correction lens 23 are the movements of the light incident on the PSDs 38X-3, 38Y-3. PSD38X-3,38Y-3 outputs the information of the position of the light which injects into the light-receiving surface as two electric current values, and detects a position by calculating it.

Next, the calculation of the lens position will be described with reference to FIGS. FIG. 11 is a circuit diagram showing an example of an arithmetic circuit that calculates the position of slit light from the output current value of the PSD. The two current values I1 and I2 output from the PSD 38-3 are converted into voltage values V1 and V2, respectively, by the current-voltage converter 39-1, and the two voltage values V1 and V2 are calculated by the calculator 39-2. Entered in.
The calculation unit 39-2 uses the calculation formula shown in FIG.
Position x of slit light on the light receiving surface of SD38-3
Is calculated and output as a voltage value V0.

FIG. 12A shows a one-dimensional PSD 38-3.
6 is a graph showing the two current values I1 and I2 with respect to the upper position. In FIG. 12A, the horizontal axis x is P
The coordinates are on the light receiving surface of SD38-3, the center of the light receiving surface is the origin of the coordinates, and L is the total length of the light receiving surface of PSD38-3. The vertical axis I is the current value. PSD38-
The values I1 and I2 of the electric current flowing on 3 differ depending on the position of the light-receiving surface, and the graph of I1 and I2 is I
It is symmetrical about the axis.

In FIG. 8, the light of IRED 38-2 is
When incident on the PSD 38-3 through the slit 38-1, the PSD 38-3 outputs two current values I1 and I2 at the position of the slit light on the light receiving surface. For example, as shown in FIG. 12B, when the slit light is incident on the position x on the PSD 38-3, the current values I1 and I2 corresponding to the positions are output.

FIG. 13 is a graph showing the relationship between the position of slit light on the PSD and the output voltage value. In the graph of FIG. 13, the horizontal axis x indicates the coordinates on the light receiving surface of the PSD, and the center of the light receiving surface is the origin. Also, the vertical axis V
Is the output voltage value. As can be seen from FIG. 13, P
On the light receiving surface of SD38-3, the position of the slit light and the output voltage value are in a proportional relationship, and the position of the slit light, that is, the blur correction lens 23 is monitored by monitoring the output voltage value from the calculation unit 39-2. The position of can be detected.

However, in the shake correction device as shown in FIG. 10, the position of the shake correction lens 23 is not directly monitored by the lens position detection device 37, and
For the light emission of the IRED 38-3, the blur correction lens 23
The slit 38 attached to the member 51 integrated with
1, the output is indirectly monitored as the output of the PSD 38-3, and the output is fed back. Therefore, if there is an error between the position of the blur correction lens 23 and the output of the lens position detection device 37, the error cannot be compensated for in control, and the error of the position of the blur correction lens 23 remains as it is. Will be. Therefore, the conventional shake correction device calibrates the position of the shake correction lens 23 and the position of the PSD 38-3. This calibration is performed by driving the shake correction lens 23 within the movable limit range immediately after the main switch is turned on.

Next, with reference to FIG. 14, the operation from turning on the main switch of the camera shown in FIG. 7 to the end of photographing will be described. FIG. 14 is a CP of the camera of FIG.
6 is a flowchart showing the operation of U. First, CPU1
2 starts the process (step S100), inputs the ON signal of the main switch 13 (step S101),
Calibration processing of the position of the blur correction lens 23 and the output of the PSD 38-3 is performed (step S102).

Next, the CPU 12 pushes the half-press SW 14 to the O position.
When the N signal is input (step S103), the angular velocity sensor 32 is turned on (step S104). And
After performing the processing of photometry and distance measurement (step S105),
Further, it is determined whether or not the full-press SW 15 is ON (step S106), and if not, the process proceeds to step S107. Further, the CPU 12 determines whether the half-push SW 14 is ON (step S107), the process returns to step S103 if the half-push SW 14 is ON, and ends the process if the half-push SW 14 is OFF.

On the other hand, when the CPU 12 determines in step S106 that the full-press SW 15 is ON, it turns ON the image stabilization follow-up control (step S10).
9). Next, exposure is started (step S110), and after a predetermined time, exposure is ended (step S111). Further, the anti-vibration tracking control is completed (step S1).
12), the angular velocity sensor 32 is turned off (step S1)
13). Finally, film winding is performed (step S
114), and a series of processing ends (step S11).
5).

FIG. 15 is a flow chart showing the flow of the conventional X-axis calibration processing of the position of the shake correction lens and the position output by PSD. FIG. 16 is a diagram showing the movement of the shake correction lens at the time of calibration of the X-axis, and the right side of the drawing is + X.
The upward direction is the + direction of Y. First, the conventional calibration process will be described with reference to the flowchart of FIG. In step S200, when the process is started, the shake correction lens barrel portion 51 is moved in the + direction of X (step S2
01), the X-axis position detection output is detected, and it is determined whether or not the X-axis position detection output has changed (step S20).
2) If it has changed, the process returns to step S201 and moves in the + direction of X.

In step S202, if the X-axis position detection output has not changed, the shake correction lens barrel 51
As shown in FIG. 16 (a), since the position of hits the movable limit member 53X-1, the process proceeds to step S203. In step S203, the X-axis position detection output Vx (+) at this time is stored.

Next, the shake correction lens barrel 51 is moved in the negative X direction (step S204), the X-axis position detection output is detected, and it is determined whether or not the X-axis position detection output has changed. (Step S205), and if it has changed, the process returns to Step S204 and moves in the-direction of X. In step S205, if the X-axis position detection output has not changed, the position of the shake correction lens barrel 51 is changed to that in FIG.
As shown in (b), since it hits the movable limit member 53X-2, the process proceeds to step S206. Step S
At 206, the X-axis position detection output Vx (-) at this time
Is stored.

Finally, in step S207, Gx
= {Vx (+)-Vx (-)} / (movable limit range)
Is calculated and stored, and the calibration process ends (step S208). Here, the calibration process for the X axis has been described, but the same process is performed for the Y axis.

[0022]

However, the correction of the position of the shake correction lens 23 and the position output by the PSD 38-2 is performed immediately after the main switch is turned on.
When the driving is performed within the movable limit range of, since the driving distance of the shake correction lens 23 at the time of calibration is long, for example, when an attempt is made to shoot immediately after pressing the main switch,
It took a long time to calibrate, and there was a possibility of missing a photo opportunity.

The problem to be solved by the present invention is to provide a shake correction device which can shorten the calibration time of the position of the shake correction optical system and the position detection output of the shake correction optical system, and can shorten the photographing preparation time. That is.

[0024]

In order to solve the above-mentioned problems, the invention of claim 1 comprises a blurring correction optical system for correcting image blurring caused by vibration, and a drive section for driving the blurring correction optical system. A shake correction device including a position detection unit that detects a position of the shake correction optical system, and a calibration unit that calibrates the position detection unit by moving the shake correction optical system, wherein the calibration unit includes: It is characterized in that a calibration movable range in which the blur correction optical system is movable for calibration is narrower than a correction movable range in which the blur correction optical system is movable for blur correction.

According to a second aspect of the present invention, in the shake correction device according to the first aspect, there is provided a calibration movable range limiting section for limiting the calibration movable range, and the calibration section is limited by the calibration movable range limiting section. The calibration is performed based on the amount of movement of the shake correction optical system within the corrected calibration movable range.

According to a third aspect of the present invention, in the blur correction device according to the second aspect, the calibration movable range limiting section is within the correction drive range of the blur correction optical system.

According to a fourth aspect of the present invention, in the blur correction device according to the third aspect, the calibration movable range limiting section is located at the center of the correction drive range of the blur correction optical system.

According to a fifth aspect of the present invention, in the blur correction device according to the second aspect, the calibration movable range limiting section is outside the correction drive range of the blur correction optical system.

According to a sixth aspect of the present invention, in the blur correction device according to the fifth aspect, the blur correction optical system is provided in two directions in which the correction drive ranges intersect, and the calibration movable range limiting unit. Is provided outside the intersecting position on one end side of each of the correction drive ranges of the blur correction optical system.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) Hereinafter, an embodiment of the present invention will be described in more detail with reference to the drawings. In addition,
The parts that perform the same functions as those of the above-described conventional example are denoted by the same reference numerals, and duplicate drawings and description will be appropriately omitted.
FIG. 1A is a top view of the blur correction device according to the first embodiment, FIG. 1B is a cross-sectional view, and FIG. 1C is a bottom view. The blur correction lens 23 is the blur correction lens barrel 5.
The image stabilization lens barrel 51 is
It is supported in a cantilever manner by the four flexible support rods 52 and can move in a direction substantially orthogonal to the optical axis (see FIG. 9). Further, the blur correction lens barrel 51 has a driving range limiting section 53X-1, 53X-2, 53Y- on its periphery.
1, 53Y-2 are provided, and as shown in FIG. 1C, limit the drive range of the shake correction lens barrel 51 to within a certain range. In the first embodiment, a calibration limiting unit 55X, 5 for calibrating the outputs of the shake correction lens 23 and the lens position detecting device 37 is provided in a part of the drive range limiting unit.
5Y is provided.

FIG. 2 is a flow chart showing a method for calibrating the position of the blur correction lens and the output of the PSD according to the first embodiment. FIG. 3 is a diagram showing the movement of the shake correction lens at the time of calibration, in which the right direction is the + direction of X and the upward direction is the + direction of Y.

First, when the processing is started in step S300, the blur correction lens 23 is moved to the X-axis calibration limiting section 55X as shown in FIG. 3A (step S300).
301). Next, the shake correction lens 23 is moved in the + direction of X (step S302), the X-axis position detection output is detected, and it is determined whether or not the X-axis position detection output has changed (S303). If it has changed, the process returns to step S302 and moves in the + direction of X. If the X-axis position detection output does not change in step S303, the position of the shake correction lens 23 hits the calibration limiting unit 55X-1 as shown in FIG.
Proceed to 304. In step S304, the X-axis position detection output Vx (+) at this time is stored.

Next, the shake correction lens 23 is moved in the negative X direction (step S305), the X-axis position detection output is detected, and it is determined whether or not the X-axis position detection output has changed ( (Step S306), if changed, the process returns to Step S305 and moves in the-direction of X. Step S3
At 06, if the X-axis position detection output does not change, the position of the shake correction lens 23 hits the calibration limiting unit 55X-2 as shown in FIG.
Proceed to step S307. In step S307, the X-axis position detection output Vx (-) at this time is stored.

Finally, in step S308, Gx
= {Vx (+)-Vx (-)} / (calibration limit range) is calculated and stored, and the calibration process is terminated (step S309).

Next, the same operation is performed in the Y direction. After the calibration in the X direction is completed, the shake correction lens barrel 51 is once returned to the center position of the drive range. Then,
The shake correction lens barrel 51 is provided with the Y-axis calibration limiting unit 55Y.
Move up to. Since the following operation is the same as the X axis,
Here, the description is omitted.

According to the first embodiment, the calibration movable range in which the blur correction lens 23 can be moved for correction is narrower than the correction movable range in which the blur correction lens 23 is movable for blur correction. Has been shortened. Further, since the calibration limiting parts 55X and 55Y are in the center of the correction movable range,
The value at the linear position of the detection output enables the calibration (see the position in FIG. 12A).

(Second Embodiment) Next, a second embodiment will be described. FIG. 4A is a top view showing the blur correction device according to the second embodiment, FIG. 5B is a sectional view, and FIG. 5C is a bottom view. Anti-shake lens barrel 5
1, the drive range limiting unit is provided in the peripheral portion,
As shown in FIG. 5C, the drive range of the shake correction lens barrel 51 is limited to a certain range. Further, a calibration limiting unit 56 for calibrating the outputs of the blur correction lens 23 and the lens position detecting device 37 is provided in a part of the drive range limiting unit.

FIG. 5 is a flow chart showing a method for calibrating the position of the blur correction lens and the output of PSD according to the second embodiment. FIG. 6 is a diagram showing the movement of the shake correction lens at the time of calibration. The right side of the drawing is the + direction of X, and the upward direction is the + direction of Y.

First, when the processing is started in step S400, the blur correction lens 23 is moved to the X-axis calibration limiting section 56 as shown in FIG. 6A (step S4).
01). Next, the shake correction lens 23 is moved in the + direction of X (step S402), the X-axis position detection output is detected, and it is determined whether or not the X-axis position detection output has changed (step S403). . If it has changed, step S
Returning to 402, move in the + direction of X.

In step S403, if the X-axis position detection output has not changed, the position of the shake correction lens 23 is adjusted to the calibration limiter 56X as shown in FIG. 6B.
Since it hits -1, the process proceeds to step S404. In step S404, the X-axis position detection output V at this time is detected.
Remember x (+).

Next, the blur correction lens is moved in the negative X direction (step S405). The X-axis position detection output is detected, and it is determined whether or not the X-axis position detection output has changed (step S406). If it has changed, step S4
Return to 05 and move in the X direction. Step S406
In, if the X-axis position detection output has not changed,
As shown in FIG. 6C, since the position of the blur correction lens 23 hits the calibration restriction unit 56X-2, the process proceeds to step S407. In step S407, the X-axis position detection output Vy (-) at this time is stored.

Next, in step S408, Gx =
{Vx (+)-Vx (-)} / (calibration limit range) is calculated and stored.

Further, the blur correction lens 23 is moved in the + direction of Y (step S409), the Y-axis position detection output is detected, and it is determined whether or not the Y-axis position detection output has changed (step S409). S410), if changed, the process returns to step S409 and moves in the + direction of Y. Step S
If the position detection output of the Y-axis does not change at 410, the position of the shake correction lens 23 hits the calibration restriction unit 56Y-1 as shown in (d) of FIG. 6, so the process proceeds to step S411. . In step S411,
The Y-axis position detection output Vy (+) at this time is stored.

Next, the shake correction lens 23 is moved in the negative Y direction (step S412), the Y-axis position detection output is detected, and it is determined whether or not the Y-axis position detection output has changed ( (Step S413) If it has changed, the process returns to Step S412 and moves in the-direction of Y. Step S4
At 13, if the X-axis position detection output does not change, the position of the shake correction lens 23 hits the calibration restriction unit 56Y-2 as shown in (e) of FIG.
It proceeds to step S414. In step S414, the Y-axis position detection output Vy (-) at this time is stored. Finally, in step S408, Gy = {Vy (+)-
Vy (-)} / (calibration limit range) is calculated and stored, and the calibration process is terminated (S416).

According to the second embodiment, the calibration limiting unit 5
Since 6 is shared between the X-axis and the Y-axis, it is not necessary to move when performing the Y-axis calibration after performing the X-axis calibration, and further, the time required for the calibration can be shortened.

[0046]

As described above in detail, according to the present invention, the calibration unit is provided with the shake compensation optical system for the calibration rather than the compensation movable range movable for the shake compensation of the blur compensation optical system. The movable calibration range is narrower, so the time required for calibration is shorter. Therefore, it is possible to shorten the photographing time of the camera equipped with the shake correction device.

[Brief description of drawings]

FIG. 1 is a top view, a cross-sectional view, and a bottom view of a shake correction device according to a first embodiment.

FIG. 2 is a flowchart showing a method for calibrating the position of the blur correction lens and the output of PSD according to the first embodiment.

FIG. 3 is a diagram showing the movement of the shake correction lens during calibration of the shake correction apparatus according to the first embodiment.

FIG. 4 is a top view, a cross-sectional view, and a bottom view of a blur correction device according to a second embodiment.

FIG. 5 is a flowchart showing a method for calibrating the position of the blur correction lens and the output of PSD according to the second embodiment.

FIG. 6 is a diagram showing the movement of a blur correction lens during calibration of the blur correction apparatus according to the third embodiment.

FIG. 7 is a block diagram showing a camera with a shake correction device according to a conventional example.

FIG. 8 is a diagram showing in detail a drive device for a shake correction lens according to a conventional example.

FIG. 9 is a diagram showing a support structure of an image stabilization lens.

FIG. 10 is a block diagram showing a control system of a blur correction device according to a conventional example.

FIG. 11 is a circuit diagram showing an example of a calculation circuit that calculates the position of slit light from the output current value of the PSD.

FIG. 12 shows a position on a one-dimensional PSD 38-3,
6 is a graph showing two current values I1 and I2.

FIG. 13 is a graph showing the relationship between the position of slit light on the PSD and the output voltage value.

14 is a flowchart showing the operation of the CPU of the camera of FIG.

FIG. 15 is a flowchart showing a flow of a conventional X-axis calibration process of the position of the shake correction lens and the position output by PSD.

FIG. 16 is a diagram showing the movement of the shake correction lens at the time of calibration of the X axis, where the right direction in the drawing is the + direction of X and the upward direction is the + direction of Y.

[Explanation of symbols]

 23 blur correction lens 51 blur correction lens barrel 55X, 55Y, 56 calibration restriction unit

Claims (6)

[Claims] 1. A blur correction optical system that corrects image blur caused by vibration, a drive unit that drives the blur correction optical system, a position detection unit that detects a position of the blur correction optical system, and the blur correction optical system. A blur correction device including a calibration unit that calibrates the position detection unit by moving the system, wherein the calibration unit has a correction movable range that is movable by the blur correction optical system for blur correction. A shake correction device characterized in that the shake correction optical system has a narrower movable range for calibration that can be moved for calibration. 2. The shake correction device according to claim 1, further comprising a calibration movable range limiting unit that limits the calibration movable range, wherein the calibration unit limits the calibration movable range by the calibration movable range limiting unit. An image blur correction device, which performs calibration based on the amount of movement of the image blur correction optical system. 3. The blur correction device according to claim 2, wherein the calibration movable range limiting unit is within a correction drive range of the blur correction optical system. 4. The blur correction device according to claim 3, wherein the calibration movable range limiter is located at a central portion of a correction drive range of the blur correction optical system. 5. The blur correction device according to claim 2, wherein the calibration movable range limiter is outside a correction drive range of the blur correction optical system. 6. The blurring correction apparatus according to claim 5, wherein the blurring correction optical system is configured such that the correction driving ranges intersect each other.
The shake correction device is provided in one direction, and the calibration movable range limiter is provided outside an intersecting position on one end side of each correction drive range of the shake correction optical system.