JP3204116B2 - Optical device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device such as a camera and, more particularly, to an optical device having a focus adjusting device for adjusting the focus of an optical system and a blur correcting device for detecting the degree of blur and correcting the blur.

[0002]

2. Description of the Related Art There has been proposed an optical device, particularly a camera, which detects a focus state and automatically adjusts a focus based on the focus detection data. If the automatic focusing camera shakes during shooting, the reliability of the focus detection data decreases for the following reasons.
In a focus detection device of a type in which a subject image is picked up by a photoelectric conversion element such as a CCD and the focus state is detected based on this image pickup signal, the subject image on the photoelectric conversion element is blurred. The focus detection is performed based on this. In addition, since the position of the image of the focus detection target is not stable, this image may deviate from the light receiving surface of the photoelectric conversion element. In this case, a focus state with respect to the background instead of the main subject is detected.

On the other hand, in order to capture an image without blur,
A camera that detects the degree of blur and corrects the blur of the subject image has also been proposed. For example, JP-A-1-130126
In JP-A No. 6-1980, a camera having both an automatic focusing device and a shake correction device is proposed. In the case of this camera, the above problem can be reduced to some extent because the blur of the subject image used for focus detection is corrected by the blur correction device.

[0004]

As described above, if a blur occurs during photographing in the automatic focusing camera, the reliability of the detected focus detection data decreases. Therefore,
When focus adjustment is performed based on the low-reliability focus detection data, there is a problem that a subject is not correctly focused.

[0005] Further, since a camera provided with a shake correction device does not perform focus adjustment control corresponding to the detected degree of shake, if a large shake that cannot be corrected by the shake correction device occurs, the above-described method is applied. This causes a problem that the focus adjustment accuracy deteriorates.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and detects a focus state of an optical system to focus.
Performs Tencho clause, and the optical device for correcting a shake of the detection to the object image of the degree of blur, correctly relative to the object
It is an object to provide an optical device capable of focusing .

[0007]

An optical device according to the present invention comprises: an optical system for condensing light from an object to form an image of the object; a focus detecting unit for detecting a focus state of the optical system; Based on focus detection data detected by the focus detection means, focus adjustment means for adjusting the focus of the optical system, blur detection means for detecting the degree of blur, and based on the blur detection data detected by the shake detection means. A camera shake correction means for correcting the shake of the object image, and if the degree of the shake detected by the shake detection means is smaller than a predetermined value, the focus adjustment means is provided with the focus detection means even if the shake is detected.
And control means for controlling the focus adjustment means not to perform the focus adjustment operation if the detected degree of blur is greater than a predetermined value.

According to the present invention, when the degree of the blur detected by the blur detecting means is smaller than the predetermined value, the focus adjusting means detects the focus even when the blur is detected.
The focus adjustment operation is performed based on the detection of the means. If the degree of blur detected by the shake detection means is larger than a predetermined value and cannot be corrected even by the shake correction means, the focus adjustment operation by the focus adjustment means is performed. Disappears. For this reason, the focus adjustment operation is performed even in the state where the small blur has occurred, and the focus adjustment operation based on the unreliable focus detection data detected in the state where the large blur has occurred is not performed.

Preferably, the shake detecting means has an angular velocity sensor, and the shake correcting means has a displaceable optical element provided in the optical system.

More preferably, the optical device is a camera, and the optical system is a photographing optical system for condensing light from a subject and forming an image of the subject.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the following description,
A description will be given of not only the system of the present invention but also the entire system including parts and other functions not directly related to the present invention.

FIG. 1 is a schematic perspective view of a camera having a camera shake detection sensor according to the present invention. Referring to FIG.
The camera according to the present invention includes a camera body 1 and an interchangeable lens 2 that is interchangeably provided on the camera body 1. The camera body 1 includes an X-direction camera shake sensor _Sx for detecting the amount of camera shake in the X direction in the figure and a Y sensor for detecting the amount of camera shake in the Y direction.
And direction with Dinner shake sensor S _y, X, _Y direction shake sensor S _x, the display unit D for issuing a warning when S _y is not in operation
And an ISP _1.

FIG. 2 is a circuit block diagram of the camera of this embodiment. Referring to FIG. 1, a camera according to the present invention includes:
The microcomputer includes a microcomputer (hereinafter referred to as “microcomputer”) μC that controls the entire camera and performs various calculations. A focus detection circuit AFct for performing focus detection is connected to the microcomputer μC. The focus detection circuit AFct includes a CCD, an integration control circuit, and an A / D conversion circuit. The focus detection circuit AFct obtains information on a subject in a distance measurement area described later, A / D converts the information, and outputs the information to the microcomputer μC. The main parts shown in the circuit block of the camera according to the present invention will be described below.

The photometric circuit LM is provided for two areas to be described later.
And perform photometry, convert the photometric value to A / D
And output it to the μC as luminance information. Display control circuit DIS
The PC inputs a display control signal from the microcomputer μC and
Display unit DISP on the top of the main unit ₁And tables in finders
Indicator DISP_TwoTo make a predetermined display. Camera shake detection
The device BL is used for camera shake as will be described in detail later.
Perform detection.

The microcomputer μC includes an electronic flash device ST, a dimming circuit for receiving the reflected light of the subject at the time of flashing light passing through a photographic lens (not shown), and stopping the flashing when a proper exposure is reached. A lens that outputs information specific to the STC and the interchangeable lens to the microcomputer μC of the camera, and drives a later-described correction actuator (a pulse motor in this embodiment) based on a correction amount for camera shake correction sent from the camera. Includes a lens circuit LE provided in the camera. The microcomputer μC includes a lens drive control circuit LECN that drives the taking lens based on the focus detection information, a shutter control circuit TV _CT that controls the shutter based on a control signal from the microcomputer μC, and a control signal from the microcomputer μC. An aperture control circuit AV _CT for controlling the aperture, a motor control circuit MD for winding and controlling the film based on a control signal from the microcomputer μC, a battery E as a power supply, a diode D ₁ for backflow prevention, and a backup for the microcomputer μC. A capacitor C _BU having a large capacity, a power supply transistor Tr1 for supplying power to a part of the above-described circuit, and an FET for supplying power to a motor for correcting camera shake by using a field-effect switch.
(Tr2) is connected.

Next, switches will be described. The photometric switch S1 is an auto focus (hereinafter, referred to as “AF”)
The camera is operated to perform an operation (for example, photometry and display of various data) of the camera including the operation, and is turned ON by pressing a first stroke of a release button (not shown). If the photometric switch S1 is turned on, the microcomputer μC executes an interrupt flow INT ₁ of FIG. 6 to be described later. The main switch S _M is a switch that enables the camera to operate when turned on. When the switch is turned from OFF to ON or from ON to OFF, an interrupt SMINT described later is executed. The switch S _IHBL is a switch for inhibiting camera shake correction, and the switch S _SP is a switch for switching a photometric mode (spot / average).
The release switch S2 is a switch operated when performing a shooting operation, and is turned on when a second stroke (deeper than the first stroke) of the release button is pressed. The switch X is a so-called X contact, and is turned on when one shutter curtain travel is completed, and turned off when the release member (not shown) is charged.

FIG. 3 shows a state in which the main switch S _M is turned on and then turned off.
Interrupt SM executed by F or OFF to ON
It is a flowchart which shows INT. Referring to FIG.
When this interrupt is made, first, the microcomputer μC resets (0) all flags and data (step # 5) (hereinafter, steps are abbreviated). And the main switch _SM is ON
It is determined whether or not the data has become ON. If it is ON, data is input from the lens (# 10, # 15). As data, Enter

FIG. 4A is a flowchart showing a data input subroutine of a portion indicated by # 15 in FIG. Referring to FIG. 4A, in the data input subroutine, data indicating mode (I) (data input) is set (# 180), and the potential of terminal CSLE is set to L level (# 182). The output data is output (# 18
5) Subsequently, the data such as the focal length f is input from the lens side (# 190), and the potential of the terminal CSLE is set to the H level (# 195). Here, the mode (I) is a control mode for the lens, and the subroutine LESI0 (I) represents data input to the camera as described with reference to FIG. 4A, and the LESI0 shown in FIG. (II) represents a mode (II) indicating data output from the camera.

Returning to the flowchart of FIG. 3, it is determined whether or not a lens is mounted on the basis of data input from the lens side (# 20). If the lens is mounted, to turn on the transistor Tr2, The potential of the terminal PW1 is set to the H level (# 25). As a result, power is supplied to the camera shake correction drive motor. Data for resetting the camera shake correction lens is set, and the subroutine LES
Data is output to the lens by the I0 (II) subroutine (# 35). The output data includes There is.

The LESI0 (II) subroutine for outputting data from the camera body to the lens will be described with reference to FIG. First, the mode (I) data is reset (# 200), the voltage of the terminal CSLE is set to L level (# 202), and the mode signal mode (II) is output (# 205). Thereafter, the output data is output (# 210), the potential of terminal CSLE is set to H level (# 215), and the program returns.

Next, the process proceeds to # 42 in FIG. 3 (here, # 2
0, the program proceeds even if it is determined that there is no lens), resets the timer T, sets the timer F1, which is a flag indicating this, and sets the potential of the terminal CHST to start strobe boosting. H level (♯
40 to $ 45). Next, it is determined whether or not the camera shake correction inhibition detection switch is turned on (# 50). If the correction inhibition detection switch is ON (correction inhibition), display inhibition data is set (# 55). This is output to the display control circuit (# 60), whereby the display indicating that camera shake is being corrected is turned off. Then, wait until the value of the timer T reaches T2 (about 5 minutes) (# 65), and the program proceeds to step # 1.
Go to 25. In step # 125, the strobe boosting is stopped, the potential of the terminal CHST is set to the L level, the data of the angular velocity monitor ON is reset, this signal is output to the blur detection device BL, and the motor is turned off (# 125 to # 13).
5). Then, the power supply transistors Tr2 and Tr1 are turned off.
Then, the display data is set, this is output to the display circuit to turn off the display, the timer flag (timer F) is reset, and the microcomputer stops its operation (# 140 to # 14).
8).

If it is determined in step # 50 that the switch for inhibiting correction has not been turned on, the program proceeds to step # 70.
To perform a data set for turning on the angular velocity monitor, set the sensor mode to A, set this data, and output the data to the camera shake detector BL (# 70 to # 8)
0). Here, there are A and B in the sensor mode. In the sensor mode A, the angular velocity monitor for camera shake detection is turned ON only for a fixed time, and in the sensor mode B, the angular velocity sensor is kept ON. The two types of sensor modes are provided to reduce current consumption and to operate the angular velocity sensor only when necessary, such as during shooting.

Next, camera shake detector B shown in step # 80
Subroutine BLSIO (I) indicating data output to L
The contents of the subroutine will be described. The data output here includes angular velocity monitor: ON / OFF sensor mode: A, B, OFF focal length: f Subject distance data: DV.

FIG. 4C is a flowchart showing this subroutine. Referring to FIG. 4C, in the BLSIO (I) subroutine for outputting data to the camera shake detection device, first, the data mode is set to mode (I), which is the data input mode, and the potential of terminal CSBL is set to L.
The level is set (# 220, # 222), and this data is output first (# 225). Next, the above angular velocity monitor
Data indicating whether the signal is N or OFF is output and the terminal CS
The potential of BL is set to the H level, and the program returns (# 230, # 235).

Next, returning to the flowchart of FIG. 3, the angular velocity sensor stabilizes, waits for a time for measurement, and inputs the data (# 85, # 90). The data output from this camera is There is.

FIG. 4D is a flowchart showing a subroutine BLSIO (II) for outputting the amount of camera-to-lens blur at step # 90 in FIG. FIG.
Referring to (D), subroutine BLSI0 (II)
Resets data in mode (I) (converts to mode (II) representing data output), sets the potential of terminal CSBL to L level, and outputs this data first (# 240
~ $ 245). Subsequently, the data from the shake detecting device BL is input from the microcomputer μC, the potential of the terminal CSBL is set to the H level, and the program returns (# 250, # 25)
5).

Returning to the flowchart of FIG. 3, it is determined whether or not the timer T is equal to or longer than T1 (approximately 7 seconds corresponding to the time during which the angular velocity sensor is stabilized). If T ≧ T1, the angular velocity sensor is stable. The flag (detection OKF) indicating this is set, the data indicating the WAIT display is reset, and the data is output to the display circuit (# 1
00 to $ 110).

Here, the reason why the angular velocity sensor waits for a stabilization time is that when power is supplied to the sensor, data representing a correct blur amount is not output immediately. This tendency is remarkable especially when a vibration type angular velocity sensor is used.

FIGS. 5A and 5B show the time required to stabilize the output of the angular velocity sensor when the power is turned on. FIG.
In FIG. 5A, it takes about 1 second until the output is stabilized after the power is turned on. In the example of FIG. 5B, it takes about 8 seconds until the output is stabilized. In consideration of the level to be used, a maximum wait time of 7 seconds is set in the present invention.

Next, returning to the flowchart of FIG. 3, when the timer reaches T = T2, the camera is detected to turn off the camera.
Reset the KF and execute the flow from step # 125 onward described above (# 115, # 120) Step # 9
At 5, when the timer T has not reached T1, the program proceeds to step # 125 and the system
After waiting for seconds, t = T1−T, the WAIT display data is set, the t and the WAIT display data are output to the display control circuit, and the program proceeds to step # 75 (# 155 to # 170).

As described above, according to the present invention, steps # 95 to # 110 and step # 155
~ As shown in step # 170, the main switch SM
Is displayed until the time T1 at which the angular velocity sensor stabilizes has elapsed from the time when the camera is turned on, and a display indicating that the image capturing is waited is performed, and after the time at which the angular velocity sensor stabilizes elapses, the display is reset. As a result, since the photographer can determine whether or not the angular velocity sensor for detecting camera shake is operating, the photographer does not shoot when the camera shake detection sensor is not operating, and as a result, no blurred photograph is taken. .

Next, a program executed when the photometric switch S1 is turned on will be described. 6 and 7 are flowcharts showing a program executed when the photometric switch S1 is turned on. First, the potential of the FLOK terminal indicating that flash emission is possible is set to L, and all display data is reset. ($ 260, $ 265). Then the main switch S _M is determined whether ON, the microcomputer μC if OFF is stopped (♯275). If ON
Photometry, turned ON transistor T _r 1 to perform power supply to the circuit to the AF, etc., flag indicating the focusing AFEF, the flag MDF indicating that camera shake amount is large after focusing is reset each correction protect switch It is determined whether or not the switch is ON (# 280- # 290). Step # 290
When the correction prohibition switch S _IHBL is ON, the program proceeds to step # 475, sets display prohibition data, proceeds to step # 395, and executes the subsequent flow (# 475). The details will be described later. If it is determined in step # 290 that the correction inhibition switch is OFF, the program proceeds to step # 295, where it is determined whether or not the flag indicating that the angular velocity sensor has detected OK and the detection OKF have been set. The program proceeds to step # 300 to set monitor ON data. Subsequently, a flag indicating that the sensor is in the A mode is set, this data is output to the camera shake detection device BL, WAIT is performed for a predetermined time (10 msec), and then data of the camera shake amount is input from the detection device BL. , The program proceeds to step # 395 (# 305- # 320). Originally, for the purpose of correcting camera shake during exposure, the operation of the camera shake detection sensor should be started after the release switch S2 is turned on. However, as shown in this flow, the camera shake detection device is provided before the release switch S2 is turned on. By turning on the switch, the rise time can be shortened. When the detection OK flag indicating that the angular velocity sensor has detected OK is not set in step # 295, that is, when the sensor is not stable, data indicating that the monitor is ON and data indicating that the sensor is in mode A are set. Then, this data is transferred to the camera shake detection device B.
L, the display prohibition data is reset, and data is input from the lens (# 330 to # 345). From this data, it is determined whether or not a lens is attached,
If mounted, the transistor Tr2 is turned on to supply power to the lens-side correction motor, the lens mode is reset, and this is output to the lens side, and the program proceeds to step # 370 (# 350 to #). 365). Even when the lens is not mounted in step # 360, the program proceeds to step # 370.

At step # 370, it is determined whether or not the timer flag has been set. If so, the program proceeds to step # 376. If the timer flag has not been set, the timer flag is set, the timer T is reset and started, and the program proceeds to step # 376 (# 370 to # 374). Step # 3
At 76, it is determined whether the timer T is equal to or greater than T1.
If T ≧ T1, the detection OK flag is set and WA
The IT display is reset and the program proceeds to step # 39
Go to step 5 (steps # 376 to # 385). On the other hand, T <T
If it is 1, it is determined that the angular velocity sensor is not stable and t
= T1-T is calculated, the WAIT display data is set, and the program proceeds to step # 395.

In step # 395, data is input from the lens, photometry is performed, AF is performed, exposure calculation (AE calculation) is performed based on the photometric data, and aperture and shutter speed are obtained (# 400 to # 410). ). Each of these subroutines will be described later.

As described above, according to the present invention, as shown in steps # 376 to # 390, even in the interrupt flow when the photometric switch is turned on, the angular velocity sensor is stable after the photometric switch is turned on. Time T1
Before the time elapses, a WAIT display is performed on the display unit of the camera, and after a lapse of time during which the angular velocity sensor is stabilized, the display is reset. Therefore, as described above, before the camera shake detection sensor is stabilized, it is displayed that the camera shake detection sensor is not stable, and thus the photographer does not shoot in such a state. As a result, it is possible to provide a camera capable of taking a picture without camera shake.

In the present invention, step # 32
As shown in FIG. 5, when the detection OK flag indicating that camera shake detection is possible is NO, ON data setting of the camera shake detection monitor is performed. Therefore, the sensor circuit of the camera shake detecting device is turned on at the same time when the photometric switch is turned on.
Is done.

Next, the photometry subroutine shown in step # 400 of FIG. 7 will be described with reference to FIG. FIG. 8B shows a photometric pattern viewed from the viewfinder. As shown in FIG. 8 (B), the photometric pattern is composed of two areas: a spot photometric area BV _SP at the center and a peripheral photometric area BV _AM around it. The photometric values from each area are defined as BV _SP and BV _AM .

Referring to FIG. 8A, first, data of photometric values BV _SP and BV _AM of each area are input, and it is determined whether or not the spot photometric switch is ON, and ON.
If not, the photometric value BV is calculated as (BV _AM + BV _SP ) /
The program returns as 2 ($ 480 to $ 49)
0). On the other hand, if the spot metering switch is ON in step # 485, it is determined whether or not the camera shake amount is large based on the data input from the camera shake detection device BL. When the camera shake amount is large, the program returns without updating the data, and when the camera shake amount is small, the measured value B
BV _SP is substituted for V and the program returns (♯
495- $ 500). The reason why the data is not updated when the camera shake amount is large is to prevent a shift in the photometric value caused by a shift in the photometric range due to a momentary shake.

Next, the AF shown in step # 405 of FIG.
The subroutine will be described. FIG. 9 is a flowchart showing the contents of the AF subroutine. Referring to FIG. 9, first, the CCD is integrated, data is input, and the current defocus amount DF1 is calculated based on the input DF amount for driving the lens (# 505 to # 515). At step # 520, whether or not flag MDF indicating that the amount of camera shake after focusing is large is set is determined. If MDF is set, the program returns as it is (# 520). Thus, if the amount of camera shake after focusing is large, the moving object determination is prohibited, and the AF lock is performed. The reason is that if the camera shake amount is large, A
This is because the F information cannot be trusted.

On the other hand, if flag MDF is not set in step # 520, it is determined whether or not flag AFEF indicating in-focus is set (# 525). If it is not set, it is determined whether or not the camera shake amount is large (# 530). If the camera shake amount is large, it is determined that the reliability is low and the program returns without driving the lens. If the camera shake amount is not large in step # 530, the obtained defocus amount DF1 is set to the defocus amount DF for driving the lens. If this is not less than the predetermined value, the DF amount is multiplied by the lens drive amount conversion coefficient. The lens drive amount is obtained by performing the lens drive, and the program returns (# 535, # 540, # 555,
$ 560). If DF, which is the defocus amount for driving the lens, is equal to or smaller than the predetermined value in step # 540, the flag AFEF indicating the focus is set, and the program returns with N = 0 (# 545, # 550).

If the flag AFEF indicating in-focus is set in step # 525, the program proceeds to step # 570 to set the current defocus amount DF1 to DF2. Then, it is determined whether or not the camera shake amount is large based on the data input from the camera shake detection device BL (# 5
80). If the camera shake amount is large in step # 580,
The flag MDF indicating this is set, and the program returns (# 585). On the other hand, if the camera shake amount is not large in step # 580, it is determined whether N is 2 or more. If N <2, it is determined that there is no data for which focus has been input, and the moving object cannot be determined, so the program returns (steps # 587 and # 590). If N ≧ 2 in step # 587, the difference between the previous and current defocus amounts is determined, and it is determined whether the difference exceeds a predetermined value (KΔDF). If not exceeded, it is determined that the object is not a moving object and the program returns (# 595, $ 600). If it exceeds, the defocus amount is set to DF = DF1 + ΔDF, and the program proceeds to step # 555 to drive the lens (#
605).

Next, an example of an AE calculation subroutine and an AE program diagram shown in step # 410 of FIG. 7 will be described with reference to FIGS. In the present embodiment, the subject is determined based on the photographing magnification data.

Β> 1/10: macro photography β ≦ 1/200: landscape photography 1/40 ≧ β> 1/100: person photography.

It is stated that the intermediate photographing magnification cannot be said to be either of the above-described photographing in the divided cases. And β> 1 /
When 10, β ≦ 1/200, the aperture is narrowed down from the open aperture value of about 2 EV or 3 EV, and the imaging performance is improved. Especially considering landscape photography, depth is taken into account. 1
When / 40 ≧ β> 1/100, the open aperture value is set as the control aperture value in order to reduce the depth in photographing a person and reduce camera shake in photographing a person.

In the present embodiment, it is determined whether or not the subject is a moving object. If the subject is a moving object, the shutter speed is added to the above-described aperture-priority program AE diagram so that the subject is not shaken by the moving object. AE diagram is adopted.

In FIG. 10, the film sensitivity SV is read, and the focal length f and the distance information DV input from the lens are read.
The shutter speed TVf which has a strong possibility of causing camera shake is obtained from the focal length f (# 610 to # 620). Next, it is determined whether or not camera shake detection is possible. If possible, a detection OK flag is set. If the camera shake correction is possible, the shutter speed is set to TVf = TV in order to extend the camera shake limit shutter speed.
If not possible, nothing is performed, and the process proceeds to step # 635 (# 625, # 630). It has been conventionally said that it is better to use the shorter one of the currently determined shutter speed and the camera shake limit shutter speed in order to prevent a blurred photograph from occurring. The camera shake limit shutter speed is reduced by the above steps.
In step ♯635, open F value AV _O lenses whether AV _O ≧ 5 is determined (♯365). If the lens opening F value AV _O ≧ 5, the aperture change amount ΔAV = 2, and if AV _O <5, the change amount ΔAV = 3, and the program proceeds to step # 646. here,
Brightness value BV is the BV = BV _O + AV _O, exposure value EV
Are set to EV = BV + SV (# 646, # 647).

After obtaining the exposure value EV, the photographing magnification β is determined (# 655), and β> 1/10 or β ≦ 1/2.
At 00, the program proceeds to step # 670. 1
/ 20 ≦ β <1/40 or 1/100 ≧ β> 1/2
At 00, the program proceeds to step 670 with the aperture correction amount ΔAV set to ΔAV / 2. 1/40 ≧ β1 / 10
When it is 0, the aperture correction amount ΔAV is set to 0, and the program proceeds to step # 670 (# 655 to # 665). In step # 670, the shutter speed TV is set to TV = EV
− (AV _O + ΔAV). Step # 675
If the flag FLF indicating flash photography is set in step, the program proceeds to step # 770. If the flag FLF is not set, the program
Proceeding to 680, it is determined whether the calculated shutter speed TV is equal to or lower than the camera shake possibility speed TVf (# 68).
0). If TV ≦ TVf, the aperture AV is AV = EV−
TVf, and TV = TVf (# 68
5,687).

[0048] Next aperture AV is determined whether _{AV <AV O (♯690),} AV < When a AV _O is
AV = AV _O and the shutter speed TV is EV-A
It is set to V _O ($ 700), and the program proceeds to step $ 7
Go to 05. The TV obtained by calculation, and AV is the control shutter speed TV _C, and aperture V _C, are performed determination of the release lock, which will be described later, the program returns (♯690~♯715). In step ♯690, when the AV ≧ AV _O, the program proceeds to step ♯705 is without doing anything.

In step # 680, TV> TVf
If so, the program proceeds to step # 717, where the flag MDF set when the blur amount is large in the moving object determination
Is set or not. When this is set, that is, when MDF = 1 or 2
When the amount of change ΔDF in the number of times of defocusing is equal to or less than the predetermined value, it is determined that the subject is not a moving object, and the program proceeds to step # 738. Flag MDF in step # 717
Is not set, and the defocus change amount ΔD
When F exceeds a predetermined value KΔDF, the subject is determined to be a moving object, and the aperture is determined as AV = (１ ／) · EV−2.5 (♯725). As described above, when the subject is a moving object, the aperture value is subtracted from a predetermined value, so that the aperture value becomes the open side. As a result, the shutter speed increases.
Next, in step # 730, this aperture AV is AV ≧ AV _O
+ ΔAV is determined, and AV ≧ AV _O + ΔA
If V, the shutter speed obtained even if the subject is a moving object is slower than the value obtained by AV = AV _O + ΔAV. Accordingly, the program proceeds to step # 735, and proceeds to step # 740 with AV = AV _O + ΔAV.

On the other hand, at step # 730, AV <AV _O + Δ
If it is AV, the program proceeds to step # 731 to increase the shutter speed. Therefore, the aperture F value AV
Shutter speed T which is a bending point for narrowing down from _O
Seeking V _d as TV _d = AV _O +5, obtains the shutter speed TV in _{TV = EV-AV O (♯731} , ♯7
33). And the obtained shutter speed is TV _d
It is determined whether or not this is the case (# 735), and TV ≧ TV
If _d, is a TV = (1/2) · EV- 2.5 (♯737), if TV <TV _d, and AV = AV _O (♯736), the program proceeds to step ♯740 .

The aperture value shown in FIGS.
TV <TV_dThen AV = AV _OIs determined by TV ≧
TV_dAnd AV <AV_O+ ΔAV if AV
= (1/2) · EV-2.5, AV ≧ AV_O+ ΔAV
Then AV = AV_OThe aperture value is determined by + ΔAV. Shi
The shutter speed TV is obtained by TV = EV-AV.

At step # 740, shutter speed TV is obtained by TV = EV-AV, and it is determined whether or not this TV is greater than maximum shutter speed TVmax (# 745). If TV is not greater than TVmax,
The program proceeds to $ 705. If TV is larger than TVmax, TV = TVmax and aperture value AV is set to AV
= EV-TVmax. It is determined whether or not the aperture value AV is larger than the maximum aperture value TVmax (# 75
0 to $ 760). If AV> AVmax, AV = A
Vmax, and the program proceeds to step # 705.
If AV ≦ AVmax, the program immediately proceeds to step # 705.

At step # 675, if the flag FLF indicating flash photography has been set, the program proceeds to step 770, where the shutter speed TV
Is determined to be the camera shake possibility shutter speed TVf. If TV ≦ TVf, it is determined whether or not the value is greater than the above-mentioned TVf and the maximum flash emission tuning speed TVx (# 770, # 775). If TVf> TVx, TV = TVx, if TVf ≦ TVx, TV = T
Vf, a fast shutter speed that does not cause any camera shake is set, and the aperture is opened to make the flash light far or to reduce the amount (# 780,
# 785). In both steps # 780 and # 785, the program proceeds to step # 790, where the aperture AV is obtained by AV = EV-TV (# 790). Next, the aperture value AV obtained in step # 795 is equal to the open aperture value AV.
_It is determined whether or not AV is smaller than _O. If AV <AV _O, it is determined that AV = AV _O and the program proceeds to step # 705
Proceed to. On the other hand, if AV ≧ AV _O in step # 795, it is determined whether or not AV is larger than maximum aperture value AVmax (# 805). If AV> AVmax, A
The program proceeds to step # 705 with V = AVmax. If AV ≦ AVmax in step # 805,
The program proceeds to step # 705 without doing anything. In step # 770, if TV> TVf, it is determined whether or not it is greater than the maximum tuning shutter speed TVx.
If it is larger, TV = TVx and the program proceeds to step
Proceed to 790 (# 815, # 820), step # 81
If TV ≦ TVx at 5, the program proceeds to step # 705.

FIGS. 13 and 14 show the focal length of the lens and the open F value of 35 mm / f4 and 200 mm / f, respectively.
A program diagram of the AE for 5.6 is shown. In both figures, the value of the shutter speed TV is taken on the X-axis, the value of the aperture value AV is taken on the Y-axis, and the mutual relationship is shown using the exposure value as a parameter.

Next, the release slot indicated by # 715 in FIG.
The lock determination subroutine will be described with reference to FIG. Figure
Referring to FIG. 15, first, a flag LE indicating release lock is set.
LF and FLF indicating flash emission
And reset, the distance DV input from the lens becomes 10m
It is determined whether or not it exceeds (# 830 to $ 840). photograph
When the distance DV exceeds 10m, it is not a person shooting
No flash emission is performed. Subject distance DV is 10
m, the control shutter speed TV _CHand shake
When the speed is higher than TVf or when camera shake correction
When it is prohibited or if camera shake can be detected
(When the detection OK flag is 1)
Output, display data to be described later
The program returns (# 845 to $ 855, $ 865).

[0056] In step ♯845～♯855, control shutter speed TV _C is less than potential speed TVf shake, and when not in the correction prohibition mode, when unable to shake detection, and to have a high risk of camera shake release The lock flag LECF is set ($ 86
0), the program proceeds to step # 865.

In step # 840, distance DV is 10
If not more than m, the program proceeds to # 870, where it is determined whether or not the subject brightness BV ≦ 2. If luminance BV ≦ 2 in step # 870, flash photography is performed to give a contrast to the subject. A signal indicating whether or not the main capacitor of the flash has been charged is input from the flash device FL. If charging has been completed, a flag FLF indicating flash emission is set, and a signal from the terminal FLOK is set to enable the flash emission. The potential is set to H, and the program proceeds to step # 865. On the other hand, if the charging has not been completed in step # 875, the program proceeds to step # 860, and flag LECF indicating release lock is set. If luminance BV> 2 in step # 870, shooting is performed without a flash. Therefore,
The program proceeds to step # 845 and proceeds to step # 84
The flow after 5 is executed.

Next, the contents displayed in the display SIO subroutine will be described with reference to FIGS. 16 (A) and 16 (B). 16A shows the display in the viewfinder (corresponding to DISP ₂ in FIG. 2), and FIG. 16B corresponds to the external display shown in DISP ₁ in FIG. When this is displayed, it indicates that the camera is in the release lock state.b is displayed when camera shake correction is not prohibited, and blinks when camera shake correction is not successful as a result of correction. When shooting, charging is completed, d, e, f, and g indicate the control shutter speed and aperture value, h indicates when the angular velocity sensor is not stable, and i indicates the waiting time. When the calculation is completed, the program
Returning to FIG. 7, it is determined whether or not the release switch S2 is ON (# 420). If not, the program proceeds to step # 405. If release switch S2 is ON in step # 420, it is determined whether or not release lock is set (# 425). If it is a release lock (LELF = 1), the program proceeds to step # 445. If the release lock is not established in step # 425 (LELF = 0), exposure control is performed (# 430), and the film is wound one frame (# 43).
5) Wait until the photometric switch S1 is turned off (# 4
40). If photometric switch S1 is turned off in step # 440, the program proceeds to step # 445. The details of the exposure control shown in step 430 will be described later. In step # 445, the photometric switch S1 is
It is determined whether it is FF or not, and if it is ON, the power holding timer TA is reset and started (# 450), and the program proceeds to step # 295. If photometric switch S1 is OFF in step # 445, the program proceeds to step # 455, and it is determined whether or not power supply hold timer TA has reached 5 seconds or longer (# 455). If the timer is less than 5 seconds, the program proceeds to step # 29.
Go to 5. If the timer has elapsed for 5 seconds or more in step # 455, it is determined whether or not the correction inhibition switch has been turned off (# 460). If it is on, the program proceeds to # 125 (see FIG. 3). , Stop control is performed. If the correction is not prohibited in step # 460, the program proceeds to step # 465, and it is determined whether or not the power supply holding timer TA has passed T3 (one minute) or more.
If the elapsed time of the timer is less than T3 in step # 465, the terminal PW is turned off to turn off the power supply to the photometric circuit and the like.
The potential of 1 is set to L, and waits to reach T3 (# 465,
$ 470). If T3 or more, the step shown in FIG.
Proceeding to 125, stop control is performed.

Next, the AE shown in step # 430 of FIG.
The control subroutine will be described with reference to FIGS. First, it is detected whether or not the mode is the correction inhibition mode (# 890). If the mode is not the correction inhibition mode, the sensor mode of the blur detection device BL is set to mode B (continuous mode), and this data is output to the blur detection device BL. The time required for the detection device BL to input the blur data (10 m
Seconds) and wait (# 891-895). Next, in order to input this data, data communication is performed with the shake detecting device BL (♯
897). Next, in order to perform the mirror-up, and ON the mirror up magnet (not shown), performs a stop control based on the control aperture value AV _C (♯899, ♯901). Then, the data of the lens control mode is turned off, and data communication (II) with the lens is performed in order to output the blur amount data and the data such as the mode data to the lens, and it is determined whether or not the mirror up is completed. Yes ($ 903- $ 9
10). If the mirror-up has not been completed, the blur amount data is input from the blur detection device BL, and the program proceeds to step # 905, and outputs the blur amount data to the lens side (# 915). In step ♯910, if complete mirror up (S _MUP is ON), the program proceeds to step ♯920, inputting data from the camera-shake detector BL (♯920). It is determined whether or not the blur amount is large based on this data (# 925). The reason for such a program is as follows. The amount of blur due to operation of the release button and the amount of blur due to release control such as aperture control and mirror control increase. In order to reduce the amount of blur during exposure, the amount of blur at this time is detected, and when the amount of blur is large, release is prohibited until the amount of blur is reduced. In step # 925,
When it is determined that the blur amount is large, when outputting the blur amount data to the lens, data communication is performed with the lens, and after the blur amount is reduced, the program returns to # 920 (# 930, # 935). . In step # 925, if the blur amount is small, the program proceeds to step # 9.
Proceeding to 40, the lens mode is set to the release mode, and this data is output to the lens (# 945). Then, the film sensitivity data SV is output to the light control circuit as analog data via the D / A converter. A control shutter speed TV _C obtains real-time T _C (♯955), and OFF the locking magnet of the front curtain of the shutter, the timer T for exposure time
Are reset-started (# 950 to $ 960). Then, the real time T _C is compared with the current time of T, and (T _C −
T) whether greater than a predetermined value K _T is determined (♯
970). This _KT is a time slightly longer than the time required for each data communication between the blur detection device BL and the lens. If the _KT is shorter than this, it is determined that accurate exposure time control cannot be performed, and the program proceeds to step # 975. move on. Whether exposure time timer T has become real time T _C is determined (♯975), if T ≠ T _C, the program proceeds to step ♯970. If T = T _C , the program proceeds to step # 977. In step # 970, if (T _C −T)> K _T , the blur detection device BL
The blur amount data is input and output as lens data, and the program proceeds to step # 975 (# 97
1, # 973), and in step # 975, T = T _C
Then, the program proceeds to step # 977, where the locking magnet of the second curtain is turned off (# 977). The blur amount data is input from the blur detection device BL and is output to the lens (# 979 to # 981). At this time, although it depends on the traveling speed of the rear curtain and the speed of data communication, usually only one data communication with the lens can be performed. Still,
As a result, even after the trailing curtain travel, the correction of the blur is reduced even a little until the exposure is completed. Then, after waiting for the time (5 msec) for the rear curtain to complete running, data for turning off the sensor of the shake detecting device BL is set, and this data is output to the shake detecting device BL and data is input from the lens. Based on the input data (# 983 to # 989), it is determined whether or not there is blur limit data (indicating that the correction lens has reached the correction limit) indicating whether or not lens shake correction has been performed. Is determined ($ 99
1). When there is blur limit data in step # 991 (when data is set), FIG.
The display blur data is set to blink the symbol b (# 993). If the blur limit data is not set, the display blur data is reset (# 995). Step $ 99
Go to 7. Then, display data including this data is output to the display control circuit, and the program returns (# 99
7).

If the mode is the correction prohibition mode in step # 890, control relating to the blur correction relationship is not performed. For example, only data communication with the blur detection device, data communication with the lens, and exposure control are performed.
The microcomputer μC controls the exposure from 00 or less to # 1245, which is described in steps # 891 to # 9 above.
Since only the necessary portions from 97 are used and are not particularly related to the present application, only the drawings are shown and the description is omitted.

Next, a circuit block diagram of the shake detecting device BL, a specific example of the shake detecting device, and a flowchart of a microcomputer for controlling the same will be described with reference to FIGS.

Referring to FIG. 18, the circuit block diagram of shake detecting apparatus BL includes a microcomputer μC3 for controlling the entire circuit block, communicating data with microcomputer μC for controlling the entire camera, and calculating the amount of shake. Sensor I, I
I is a monitor unit monitor I including an angular velocity sensor,
The sensor unit detects the output of the angular velocity obtained by II. The switch SW1 is a changeover switch that inputs one of the outputs of the sensors I and II to an A / D converter that performs A / D conversion. The transistors Tr3 and Tr4 supply power to the monitors I and II and the sensors I and II, respectively. The one-shot circuit OS outputs the H level for a time period until the motor is supplied with power and the output is stabilized.

FIG. 19 is a perspective view showing a tuning fork type angular velocity sensor used in the present invention. FIG. 20 is a block diagram showing a sensor unit and a monitor unit of the angular velocity sensor. FIG. 21 is a detailed circuit diagram of FIG. 19 to 2
No. 1 is disclosed in U.S. Pat. No. 4,671,112. The structures and circuit diagrams of the angular velocity sensors shown in FIGS. 19 to 21 are not directly related to the contents of the present invention, and therefore, the description thereof is omitted.

FIG. 22 is a flowchart showing the operation of the microcomputer μC3 for calculating the sequence control of the shake detecting device BL and the shake amount detection. CSBL indicating data communication
Is set to L, the flow of the CSBL shown in FIG. 22 is executed by interruption. First, data communication is performed once, and it is determined from this data whether or not an input mode is set. ($ 1005, $ 1010). If not in the input mode, data communication is performed to output data, and it is determined whether or not the sensor mode is the continuous mode B (# 1120). If the mode of the sensor is not the B mode, the detection is immediately stopped because it is not the continuous blur amount detection. If the sensor mode is the B mode, the program proceeds to step # 1065 to detect the blur amount, and the blur amount is detected (# 1115, # 112)
0). The data output here is the blur correction amount (Δ
X _BL , ΔY _BL ) and the magnitude of the blur amount.

If it is determined in step # 1010 that the input mode is set, serial communication is performed to input data. The input data at this time includes ON / OFF of the monitor of the angular velocity, A as the sensor mode,
B, OFF, focal length f, and subject distance data DV. Next, based on the data input as to whether the monitor is ON or not, if the monitor is ON, the transistor Tr3 is ON.
If OFF, the transistor Tr3 is turned OFF and the program proceeds to step 1035 (# 1020
~ $ 1030). After step # 1035, the sensor mode is determined, and if the sensor mode is the A mode,
When the terminal OPI is set to the H level for a certain period of time and the sensor mode is the mode B, in order to turn on the transistor Tr2,
The potential of terminal PW1 is set to the H level, and the program proceeds to step # 1060 (# 1035 to # 105).
0). In step # 1055, the transistor Tr2 is turned off.
If F, the potential of the terminal PW1 is set to L level and the program stops (# 1055). Step # 1060
Then, the system waits for the sensor to stabilize, and the program proceeds to # 1065. In step # 1065, flag 1STF indicating the first data communication is set, and a signal for setting switch SW1 is output to sensor I side (# 1070). A / D conversion is started, and a signal is input after waiting for the time required for A / D conversion (# 107
5- $ 1085). Next, in step # 1090, it is determined whether or not flag 1STF indicating the first time is set. If it is set, it is reset and the switch is switched to sensor II side, and the program proceeds to step # 1075. Data is input ({1105, ♯
1110). If flag 1STF has not been returned in step # 1090, a correction operation is performed from the input sensor data, and it is determined whether the sensor mode is B mode. If the sensor mode is B mode, blur detection is continuously performed. The program proceeds to step # 1065 assuming that the program needs to be executed, and if not in the B mode, the program stops (# 10
95, $ 1100).

In steps # 1065 to # 1110, data is read twice using the flag indicating the first time. This is because data to be read includes data in the X and Y directions. This is to enable reading of two data in one flowchart using this flag.

Next, the method of calculating the blur amount shown in step # 1095 of FIG. 22 will be described. In general, when the taking lens is tilted by Δθ, the image movement ΔY on the film surface
Is represented by the following equation.

[0068] ΔY = f (1-β) t anΔ θ where, f is the focal length of the taking lens, beta is a photographing magnification.

When Δθ is small, it can be approximated as follows. ΔY ≒ f (1−β ) Δθ Next, the details of the calculation of the correction amount will be described. Now, angular velocity outputs w ₁ and w ₂ for each detection timing Δt are obtained from the two angular velocity sensors. Next, the magnification β of the object to be used is obtained based on the AF information in the camera body and the focal length information fi in the interchangeable lens. From the focal length information fi, the magnification β and the angular velocity outputs w ₁ , w ₂ , Δt, the image blur amounts ΔX, ΔY
Is obtained by the microcomputer μC in the body based on the following equation.

[0070] ΔX ≒ fi · (1-β ) · w 1 · Δt ΔY ≒ fi · When _{(1-β) · w 2} · Δt magnification increases, or the element is increased parallel shake, and the approximation of paraxial The calculation may not satisfy (ΔY = f · tan θ).

Therefore, in order to reduce the blur amount obtained when the magnification is large, the term (1-β) is added.

As another embodiment, when β <1/15, ΔY = f · tan θ When β ≧ 1/15, it is considered that ΔY = 0, and when the magnification is large, no correction is made. You may.

FIG. 23 is a flowchart of the correction calculation shown in step # 1095 of FIG. In FIG. 23, steps # 1130 to # 1140 correspond to Δt described above.
It is for seeking. Step # 1145-$ 1
In 155, the shake amounts in the X and Y directions are obtained as described above. Step # 1147,
At # 1148, correction coefficients Kw ₁ and Kw ₂ are applied to the outputs w ₁ and w ₂ from the respective sensors in order to correct errors due to variations in the individual angular velocity sensors.
Then, in # 1160 and # 1165, it is determined whether or not the correction amounts ΔX and ΔY are each equal to or larger than a predetermined value KA.
If it is less than A, it is determined that the blur amount is small, data is set, and the process returns.

Next, the flash circuit will be described with reference to FIG. The booster circuit D / D boosts a low voltage (battery voltage) to a high voltage, and stores energy in the light emission energy storage capacitor MC via the rectifying element D / S. The light emission control circuit EMC emits flash light in response to an AND signal between a signal output during flash photography (the potential of the FLOK terminal is set to H as described above) and an X signal that is turned on when one curtain is completed. Start. Light emission is stopped in response to the light emission stop signal STC.

The above-described booster circuit D / D performs boosting when the potential of the boost control signal CHST from the microcomputer μC is H and there is a signal indicating that charging is not completed (Tr _D is OFF).

To detect the completion of charging, a series connection of a neon tube and a ladder resistor is connected in parallel to the capacitor MC, a transistor is connected to the ladder resistor, and the transistor Tr _D is turned on when the capacitor reaches a predetermined voltage. It is done by doing so.

Next, the circuit configuration on the lens side and the camera
The connection relationship will be described with reference to FIG. Figure 25 is a lens
The description will be made based on the circuit of the zoom lens. lens
The microcomputer LμC communicates data with the camera and shakes
Drive control of motor control circuits MC1 and MC2 for correction
Perform The zoom encoder ZM is the focus of the zoom lens
Detect distance. The distance encoder DV indicates a distance. Electric
Source V_CC2The motor control circuits MC1, MC2 and
And two motors. Power supply path V _DDBy
Power is supplied to the other circuits. Pulse motor
Motor control circuits MC1 and MC2 each having
Is connected to the ground line GND2.
The ground line GND1 is connected to circuits other than the above.
I have.

Next, the switches connected to the microcomputer LμC will be described. In the lens microcomputer LμC,
The left and right correction limit switches S _X1 and S _X2 in the X direction and the upper and lower correction limit switches S _Y1 and S _{Y2 in} the Y direction are connected, and are turned ON when the lens drive unit hits the correction limit in each direction. . The terminal CSLE is an input terminal, and the lens microcomputer LμC executes an interrupt routine CSLE described later according to an input signal from the camera. Input terminals SCK, SIN
Input a data transfer clock signal. The terminal SOUT is a terminal for outputting lens data.

From the microcomputer LμC of the camera body to CSLE
Is input to the lens side, an interrupt routine shown in FIG. 26 is executed. Data is input from the 1-byte camera body, and then the focal length f and the subject distance DV are read (# 2005-2015).

Here, data communication will be described. The data communication includes a lens communication I that outputs lens data to the camera body and a lens communication II that outputs data from the camera body to the lens. Based on the input data, communication I and II are determined (# 202
0). If the lens communication is the output mode I, the data communication SIO is performed to output the predetermined data described for each output data, the blur limit data is reset, and the microcomputer stops (# 2025, # 2027). .
In the input mode (NO in # 2020), camera shake amounts ΔX and ΔY in the X and Y directions and a mode signal are input from the camera body side (# 2020). If the lens is reset in response to the mode signal, set control is performed and the microcomputer stops (# 2035, # 2040). In the case of the release mode, the lens control is shifted until an interrupt is entered, and in the case of neither mode, the microcomputer stops without doing anything (# 2030 to # 2050).

Referring to FIG. 27, the lens control subroutine shown in step # 2050 of FIG. 26 will be described. Referring to FIG. 27, first, a lens correction amount is calculated (# 2090). This will be described in detail below. In the interchangeable lens, the ratio LH = ΔLH / ΔYL of the movement amount (L in the direction perpendicular to the optical axis) ΔLH of the camera shake correction lens to the image movement amount (L in the direction perpendicular to the optical axis) ΔYL is stored in the ROM. Here, the ratio LH is stored as information depending on the focal length in a variable focal length lens such as a zoom lens.
In some interchangeable lenses, the information is stored as information dependent on focusing. Therefore, in the interchangeable lens, the ratio LH is read from the focal length information and the distance information (extending amount of the focusing lens) DV, and converted into the correction lens movement amounts ΔLX and ΔLY.

ΔLX = LH (fi, DV) × ΔX ΔLY = LH (fi, DV) × ΔY The ratio LH is classified into the following four types depending on the type of the interchangeable lens.

(1) A lens having only one ratio LH unique to an interchangeable lens. (2) A ratio LH that is variable according to focusing (distance).
With a lens. In this case, when the camera obtains the lens extension amount, data is input from the camera.

(3) Variable ratio LH depending on zooming
With a lens. (4) Variable ratio LH for both focusing and zooming
With a lens.

Then, using these correction amounts ΔLX and ΔLY, the next blur amount is predicted. The method is as follows: (i) Linear predictive control ΔLX ₁ = LH (f, DV) × ΔX ₋₂ ΔLX ₂ = LH (f, ΔDV) × ｛ΔX ₋₁ + (ΔX ₋₁ −
ΔX ₋₂ )｝ ΔLX ₃ = LH (f, DV) × ｛ΔX ₁ + (ΔX ₁ −Δ
X ₋₁ )｝ (ii) Ratio of blur amount to previous time (ΔX _i ) / (ΔX _i1 )
Is multiplied by a certain constant r, which is used as the current blur amount weighting coefficient + linear prediction ΔLX ₁ = LH (f, DV) × ΔX ₋₂ (r · ΔX ₋₂ / ΔX)
_-3 ) ΔLX ₂ = LH (f, DV) × ｛ΔX ₋₁ (r · ΔX ₋₁ / Δ
X ₋₂ ) + ΔX ₋₁ −ΔX ₂ ｝.

Since the same applies to the Y direction, the description is omitted.
FIG. 28 shows a simulation result when the linear prediction control described in the above (i) is performed.

Returning to FIG. 27, in this way
Outputs the correction amounts ΔLX and ΔLY to the pulse motor control circuit
I do. This allows the correction to be performed, and the correction limit switch
Sx ₁~ Sy_TwoIs turned off.
If ON, set the blur limit data and use this switch
Is repeatedly detected. Same when not turned off
It is. This routine executes the CSLE interrupt again.
Continue until you

Next, reset control will be described. FIG. 29 is a diagram showing a driving mechanism of the correction lens. Referring to FIG. 29, the driving mechanism of the correction lens includes a correction lens 11 and a holding frame 12 that holds the correction lens 11. Holding frame 12
Is provided with a rod 14 that is pushed by the holding frame 12 and turns off the limit switch SX1 before the mechanical contact 13 and the holding frame 12 indicating the movement limit of the correction lens come into contact with the mechanical contact 13. When the drive pulse motor rotates, the drive unit 31 rotates. A ball screw is provided between the drive unit 31 and the drive shaft 30. Also, on the drive shaft,
A V-groove is provided, and the drive shaft is driven in the straight traveling direction by a V-groove lead as shown in FIG. Driving is performed in the range of l in the figure. Since the same applies to the Y direction, the description thereof is omitted. In the present invention, since the mechanical mechanism is not directly related, a detailed description thereof will be omitted.

FIG. 31 shows a routine of reset control in the driving mechanism of the correction lens having the above configuration.
Referring to FIG. 31, first, a forward rotation signal of the pulse is output to the circuit of pulse motor M1 in the X direction, and the circuit is driven by one pulse. It is determined whether the correction lens has been moved rightward in FIG. 29 and the switch SX1 has been turned off (# 206).
0, $ 2065). If it is determined in step # 2065 that switch SX1 is not turned off, the program proceeds to step # 2060, and further drives one pulse. If switch SX1 is turned off in step # 2065, a signal for driving pulse motor M1 in the reverse direction by KN pulses is output. Then, the pulse motor M1 is rotated in the reverse direction, and the initial position in the X direction is set (# 2070).
Next, an initial setting in the Y direction is performed.

By rotating the pulse motor M2 forward by one pulse,
It is determined whether limit switch SY1 is turned off (# 2080). Switch SY in step # 2080
If 1 does not turn off, it is further driven by one pulse.
Here, when the switch SY1 is turned off, a signal for driving the pulse motor by the KN pulse in the reverse direction is output, the pulse motor M2 is driven, and the initial setting is completed (# 208).
5), the program returns. The above constant KN
Is a constant that is predetermined for the initial position setting when the correction mechanism is configured.

[0091]

As described above, according to the optical apparatus of the present invention, an optical system for converging light from an object to form an image of an object, and a focus detecting means for detecting a focus state of the optical system. Based on the focus detection data detected by the focus detection means, a focus adjustment means for adjusting the focus of the optical system, a blur detection means for detecting the degree of blur, and a blur detection data detected by the blur detection means. Te, blur correction means for correcting the blur of the object image and, when the degree of blur detected by the blur detection unit is smaller than a predetermined value, the focus adjusting means focus detector even when blurring is detected
Control means for controlling the focus adjustment operation on the basis of the detection, and controlling the focus adjustment means so as not to perform the focus adjustment operation when the detected degree of blur is larger than a predetermined value. Therefore, even when a small blur is detected, the object can be correctly focused, and the focus adjustment operation based on the unreliable focus detection data is not performed. An optical device capable of focusing can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a camera system to which the present invention is applied.

FIG. 2 is a circuit block diagram on a main body side of a camera to which the present invention is applied.

FIG. 3 is a flowchart showing an operation of the camera system to which the present invention is applied.

FIG. 4 is a flowchart showing an operation of the camera system to which the present invention is applied.

FIG. 5 is a diagram showing the performance of a camera shake sensor to which the present invention is applied.

FIG. 6 is a flowchart for explaining the operation of the present invention.

FIG. 7 is a flowchart for explaining the operation of the present invention.

FIG. 8 is a flowchart (A) for explaining the operation of the present invention and a diagram (B) showing a photometric pattern.

FIG. 9 is a flowchart for explaining the operation of the present invention.

FIG. 10 is a flowchart for explaining the operation of the present invention.

FIG. 11 is a flowchart for explaining the operation of the present invention.

FIG. 12 is a flowchart for explaining the operation of the present invention.

FIG. 13 is a program diagram of the AE.

FIG. 14 is a program diagram of an AE.

FIG. 15 is a flowchart illustrating the operation of the present invention.

FIGS. 16A and 16B are views showing contents displayed in a display section and a viewfinder of the camera body, and a flowchart (C) for explaining the operation of the camera system;

FIG. 17 is a flowchart for explaining the operation of the camera system according to the present invention.

FIG. 18 is a circuit block diagram of a shake detection device applicable to the present invention.

FIG. 19 is a perspective view showing an angular velocity sensor applicable to the present invention.

FIG. 20 is a block diagram showing a sensor unit and a monitor unit of the angular velocity sensor applicable to the present invention.

FIG. 21 is a circuit diagram of an angular velocity sensor applicable to the present invention.

FIG. 22 is a flowchart of a microcomputer that controls a circuit block of the shake detection apparatus applied to the present invention.

FIG. 23 is a flowchart of a microcomputer that controls a circuit block of the shake detection apparatus applied to the present invention.

FIG. 24 is a circuit diagram showing a strobe circuit.

FIG. 25 is a block diagram showing a circuit configuration on the lens side.

FIG. 26 is a flowchart illustrating the operation of the lens microcomputer.

FIG. 27 is a flowchart illustrating the operation of the lens microcomputer.

FIG. 28 is a diagram showing a simulation result of camera shake correction.

FIG. 29 is a diagram showing a drive mechanism of a correction lens for performing camera shake correction according to the present invention.

FIG. 30 is a diagram showing a drive mechanism of a correction lens for performing camera shake correction according to the present invention.

FIG. 31 is a flowchart showing processing of a correction lens for performing camera shake correction according to the present invention.

[Explanation of symbols]

Reference Signs List 1 Camera body 2 Interchangeable lens SX X direction camera shake sensor SY Y direction camera shake sensor DISP ₁ Display section In the drawings, the same reference numerals indicate the same or corresponding parts.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hiroshi Otsuka Osaka International Building Minolta Co., Ltd. 2-3-13 Azuchicho, Chuo-ku, Osaka-shi (56) Reference JP-A-1-130126 (JP, A) JP-A-1-194580 (JP, A) JP-A-3-152518 (JP, A) JP-A-7-209691 (JP, A) JP-A-5-130487 (JP, A) JP-A-2-309309 (JP JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G02B ⁷ /28-7/40 G03B 5 / 00,17 / 00

Claims (3)

(57) [Claims] 1. An optical system for condensing light from an object to form an image of the object, focus detection means for detecting a focus state of the optical system, and focus detection data detected by the focus detection means Focus adjustment means for adjusting the focus of the optical system, based on the following, blur detection means for detecting the degree of blur, and correcting the blur of the object image based on blur detection data detected by the blur detection means When the degree of the blur detected by the blur detecting means is smaller than a predetermined value, the focus adjusting means determines whether or not the blur is detected based on the detection of the focus detecting means.
A control means for controlling the focus adjustment operation to perform the focus adjustment operation , and when the detected degree of blur is larger than a predetermined value, controlling the focus adjustment means not to perform the focus adjustment operation. 2. The optical device according to claim 1, wherein the shake detecting means has an angular velocity sensor, and the shake correcting means has a displaceable optical element provided in the optical system. 3. The optical device according to claim 1, wherein the optical device is a camera, and the optical system is a photographing optical system that collects light from a subject and forms an image of the subject. apparatus.