JP2002006359A - Image blur correcting device, photographing lens, camera main body and camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always realize an accurate defocus arithmetic operation in optical equipment provided with an image blur correcting function. SOLUTION: In an interchangeable lens, a routine to check a communication interrupt requirement from a camera main body is started (S1102). In a step S1104, the value of an auxiliary light projecting flag is checked. A value is set to the auxiliary light projecting flag in accordance with the contents of communications from the camera main body. When '0' is set in the auxiliary light projecting flag, that is, when no light projecting pattern is projected on the camera main body side, a blur detection arithmetic operation (S1106) and the driving of a correcting lens (S1108) are performed so as to correct image blur. When '1' is set to the auxiliary light projecting flag, that is, when the light projecting pattern is projected to a subject on the camera main body side, the driving of the correcting lens is stopped (S1110).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having an image blur correction function.

[0002]

2. Description of the Related Art Conventionally, an optical device such as a camera has a function of correcting an image blur caused by a camera shake or the like. Image blur refers to movement of the subject image on the image receiving surface of the camera, which is caused by displacement of only the camera side due to camera shake or the like with respect to the subject. Image blur correction is performed as follows. An angular velocity sensor is provided to detect camera shake, and an output signal from the angular velocity sensor is integrated to calculate a camera shake amount. Further, a correction optical system for deflecting the optical axis of the photographing optical system is provided so as to constitute a part of the photographing optical system. The correction optical system is driven so that the movement of the subject image is canceled based on the camera shake amount calculated as described above. As a result, image blur caused by camera shake or the like is corrected.

On the other hand, focus detection by a phase difference method is known as an autofocus system for a camera. In phase-difference focus detection, reflected light from a subject that has passed through the imaging optical system is split by a condenser lens and an aperture mask, and is separated by a separator lens provided for each of the split reflected light. Is re-imaged. A defocus amount of the photographing optical system is detected based on a distance between two images re-formed on the light receiving sensor. Therefore, when the subject is under low illuminance or when the contrast of the brightness of the subject is low, the defocus amount is not accurately detected, and sufficient accuracy in the autofocus performance cannot be obtained.

In order to solve such a problem and improve the autofocus performance under low illuminance and low contrast, a camera equipped with an auxiliary light system is known. In the auxiliary light system, projection light is projected toward a subject via a contrast pattern having a predetermined configuration and a projection optical system. That is, a predetermined light projection pattern is projected on the subject. The light projection pattern reflected by the subject is incident on the light receiving sensor described above, and the defocus amount is calculated based on the image interval of the light projection pattern re-imaged on the light receiving sensor. Therefore, focus detection can be performed regardless of the brightness of the outside world or the contrast of the brightness of the subject.

[0005]

By the way, even if a camera shake occurs while the projection pattern is being projected by the auxiliary light system, the projection pattern to be re-imaged is not displaced on the light receiving sensor. This is because the light emitting means of the projection light, the contrast pattern, the projection optical system, etc., and the light receiving sensor are all provided on the camera side. On the other hand, the above-described image blur correction is executed by driving a correction optical system that forms a part of the photographing optical system. Therefore, when camera shake occurs during the operation of the auxiliary light system and image blur correction is performed, the light projection pattern that passes through the imaging optical system and is re-imaged on the light receiving sensor is driven by the correction optical system. Will be displaced above. As a result, there is a problem that the contrast of the light projection pattern on the light receiving sensor is reduced, and the accuracy of calculating the defocus amount is reduced.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a camera having an image blur correction function that always realizes high-precision auto-focusing.

[0007]

According to the present invention, there is provided an image blur correcting apparatus comprising: a photographing optical system comprising a plurality of optical systems; and an auxiliary light projecting means for projecting auxiliary light having a predetermined light projection pattern toward a subject. A defocus amount detecting means for detecting a defocus amount of an optical image of a subject formed via the imaging optical system; and a driving device for driving the imaging optical system to focus the optical image based on the defocus amount. In a camera including a focusing unit, a shake detection unit that detects a shake of the optical axis of the imaging optical system, a correction optical system for image shake correction included in the imaging optical system, and a driving unit that drives the correction optical system, In order to cancel the blur of the optical image caused by the blur of the optical axis of the shooting optical system,
A drive control unit that controls the drive unit based on the optical axis shake detected by the shake detection unit, wherein the drive control unit performs the drive while the auxiliary light projection unit is operating. The driving of the correction optical system by the means is stopped.

The photographing lens according to the present invention projects auxiliary light having a predetermined light projection pattern toward a subject,
A photographing lens mounted on a camera body having an automatic focus detection function of detecting a defocus amount of an optical image of a subject based on the reflected light, the camera lens having a correction optical system for image blur correction, and A photographing optical system that forms an image on an image pickup medium provided in the camera body, a shake detecting unit that detects a shake of an optical axis of the photographing optical system, a driving unit that drives a correction optical system, and an optical axis of the photographing optical system. A drive control unit that controls the drive unit based on the shake of the optical axis detected by the shake detection unit so that the shake of the optical image due to the shake is offset,
Camera operation state detection means for detecting whether the camera body is projecting auxiliary light, and drive control means, while the camera operation state detection means detects that the auxiliary light is being projected, The driving means is stopped.

A camera body according to the present invention is a camera body on which a photographing lens is mounted, and focus detecting means for detecting a defocus amount of an optical image of a subject formed via the photographing lens, and focus detecting means. In order to assist the detection of the defocus amount by the auxiliary light projection means for projecting auxiliary light having a predetermined light projection pattern toward the subject, and the optical image based on the defocus amount detected by the focus detection means, Lens driving amount calculating means for calculating the driving amount of the photographing lens so as to focus, and information transmitting means for transmitting information indicating that the auxiliary light is projected to the subject to the photographing lens when the auxiliary light projecting means operates. And characterized in that:

A camera system according to the present invention includes a photographing optical system including a correction optical system for correcting image blur, a shake detecting means for detecting a shake of an optical axis of the photographing optical system, and a driving means for driving the correction optical system. A photographing lens comprising: a driving control unit that controls the driving unit based on the movement of the optical axis detected by the shake detecting unit; and a subject formed via the photographing optical system when the photographing lens is mounted. A defocus amount detecting means for detecting a defocus amount of the optical image of the image, and an assist for projecting auxiliary light having a predetermined light projection pattern toward a subject to assist the detection of the defocus amount by the defocus amount detecting means. A camera body including light projection means, focusing means for driving a photographing optical system to focus an optical image based on the defocus amount, and a photographing lens mounted on the camera body. Communication means for transmitting data between the photographing lens and the camera body in a state in which the auxiliary light is projected on the subject when the auxiliary light projection means operates in the camera body. Is transmitted from the camera body to the taking lens via the communication means, and the driving means in the taking lens is stopped by the drive control means.

As described above, according to the present invention, when the amount of defocus is detected when the external illumination is insufficient or when the brightness contrast of the subject is low, a predetermined pattern is applied to the subject by the auxiliary light projecting means. During the projection, the driving of the correction optical system for correcting the image blur is stopped. Therefore, since the pattern reflected from the subject is not displaced by the driving of the correction optical system, the defocus amount is accurately detected using the pattern.

Further, unnecessary projection control is stopped while the pattern is projected on the subject, so that power consumption is suppressed and the system is economical.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a camera to which the first embodiment according to the present invention is applied. The camera 10 is an interchangeable lens single-lens reflex camera. On an upper surface of the camera body 100, a shutter button 101 and a pop-up unit 102 are provided. Shutter button 101 is 2
When the switch is pushed one step, a photometric switch described later is turned on to start photometric processing. When the switch is pushed two steps, a release switch described later is turned on and a release operation is started. Pop-up unit 102
Holds a projection optical system 198 and a strobe light 103 of an auxiliary light unit to be described later. On the front side of the camera body 100, an interchangeable lens 200 (photographing lens) is mounted. A focusing optical system 220 is held in the lens barrel 201 of the interchangeable lens 200.

FIG. 2 is a block diagram showing an electric configuration of the camera 10, and includes a camera body 100 and an interchangeable lens 20.
It consists of 0. A camera control circuit (camera CPU) 110 having a microcomputer is provided in the camera body 100, and a lens control circuit (lens CPU) 210 having a microcomputer is provided in the interchangeable lens 200. The camera body 100 and the interchangeable lens 200 are provided with a plurality of contact pins 300C and 300L, respectively. When the interchangeable lens 200 is mounted on the camera body 100, the corresponding contact pins 300C and 300L come into contact with each other and are electrically connected. Connected. As a result, the camera CPU 110 and the lens CPU 210 are connected by the communication bus 301, and various communication data and control signals are transmitted between the camera body 100 and the interchangeable lens 200.

In the camera body 100, a pentaprism 122 constituting a part of a finder optical system is disposed above the quick return mirror 121. Except during imaging, the quick return mirror 121 is positioned at an angle indicated by a solid line. A part of the light beam that has passed through the focusing optical system 220 and the image blur correction unit 230 provided in the interchangeable lens 200 is reflected by the click return mirror 121 and guided to the eyepiece 123 of the finder optical system via the pentaprism 122. . When shooting
The quick return mirror 121 is flipped up to the position shown by the broken line, and the light beam that has passed through the focusing optical system 220 and the image blur correction means 230 is guided to the film F via the shutter mechanism 124. Note that the photographing optical system of the single-lens reflex camera of the present embodiment includes a focusing optical system 220, a correction optical system provided in an image shake correcting unit 230 described later,
And a variable power optical system (not shown).

The camera CPU 110 has a motor drive circuit 1
30 are connected. The motor drive circuit 130 drives a mirror motor 131 that drives the quick return mirror 121 to flip up, and drives a hoist motor 132 that winds up the film F.

The camera CPU 110 has a main switch 1
41, photometric switch 142, release switch 143,
The winding complete switch 144 and the mirror UP switch 145 are connected. The main switch 141 is a switch for turning on the power of the camera and permitting the operation. When the main switch 141 is turned on, the power of the camera body 100 is turned on, and the power of the interchangeable lens 200 is also turned on. When the shutter button 101 (see FIG. 1) is half-pressed, the photometric switch 142 is turned on, photometric processing is performed by the photometric sensor 150, and when the shutter button is fully pressed, the release switch 143 is turned on, and the release operation is executed. Is done. The mirror UP switch 145 turns on and off according to the start and end of the release operation. The camera CPU 110 outputs a control signal for starting and stopping the flip-up drive of the quick return mirror 121 to the motor drive circuit 130 based on ON / OFF of the mirror UP switch 145. In addition, the drive motor 132 for winding one frame of the film F is driven and stopped via the motor drive circuit 130 in accordance with the turning-on / off of the winding complete switch 144.

In response to the start and end of the release operation, the camera CPU 110 controls the shutter mechanism 124 via the release control IF 160 and the interchangeable lens 200 via the release control IF 160 and the aperture control amount transmission mechanism 303. The control of the diaphragm mechanism 240 provided therein is performed. Aperture control amount transmission mechanism 303 and aperture mechanism 2
Reference numeral 40 is connected by contact of the corresponding contact pins 300C and 300L.

The camera CPU 110 has a display device 170,
A non-volatile memory (EEPROM) 180 is connected. The display device 170 is provided for displaying a shooting mode, a shutter speed, and the like. EEPROM1
Various data used for the AF operation are stored in 80.

On the back of the quick return mirror 121, a sub mirror 190 is provided. Part of the light beam that has passed through the focusing optical system 220 and the image blur correction unit 230 passes through the quick return mirror 121, is reflected by the sub mirror 190, and is guided to the AF sensor 191.

The AF sensor 191 is a conventionally known sensor that detects a defocus amount of the photographing optical system by a phase difference detection method. An image sensor (not shown) in the AF sensor 191 is disposed at a position optically equivalent to the reticle B and the film surface F. Therefore, the focus state on the reticle B is equivalent to the focus state on the film surface F, and when the image on the reticle B formed by the photographing optical system is formed, in other words, by the photographing optical system. When the focus position coincides with the reticle B, the camera is in focus.

The AF sensor 191 detects, as a defocus amount, a focus state of an image on a film plane F (planned focal plane) formed by the photographing optical system. That is, the AF sensor 191 detects a defocus amount indicating in which direction and on the optical axis the focal position of the image formed by the photographing optical system at the present time is shifted from the reticle B or the film surface F. Specifically, the reflected light from the subject that has passed through the photographing optical system is split by a condenser lens (not shown) and an aperture mask (not shown), and separators are provided corresponding to the respective split reflected lights. The image is re-formed on the light receiving area of the image sensor of the AF sensor 191 via a lens (not shown). A defocus amount of the photographing optical system is detected based on an interval between two images re-formed on the light receiving region. The camera CPU 110 calculates the driving direction and the driving amount of the focusing optical system 220 based on the defocus amount detected by the AF sensor 191, and outputs the calculation result to the motor control circuit 192.

The motor drive circuit 192 includes the AF motor 19
3 is driven, and a gear block 194 is connected to the AF motor 193. Gear block 194
Represents an interchangeable lens 20 through a joint mechanism (not shown).
It is coupled to a gear block 250 provided in the inside. Although the focusing optical system 220 is shown as one lens in FIG. 2, it is actually composed of a plurality of lenses, and the gear block 25 is used for focusing.
By 0, it can be moved in the optical axis direction. That is, the AF motor 193 is driven based on the calculation result of the AF sensor 191, and the interchangeable lens 2 is driven in conjunction with the driving of the AF motor 193.
The focusing optical system 220 on the 00 side is moved along the optical axis, and as a result, a focusing operation is performed.

An auxiliary light unit 195 is connected to the camera CPU 110. The auxiliary light unit 195 is an ILED (Infrared Light Emitting) that emits near-infrared light.
Diode) 196, a contrast pattern 197 having a predetermined stripe shape, and a projection optical system 198 for guiding light emitted from the ILED 196 to a subject. Contrast The contrast pattern 197 is interposed between the ILED 196 and the projection optical system 198. When near-infrared light is emitted from the ILED 196, a stripe-shaped projection pattern is projected on the subject. The projection of the light projection pattern by the auxiliary light unit 195 is performed when it is difficult to calculate the defocus amount of the AF sensor 191 based on the reflected light of the subject, such as when the contrast of the brightness of the subject is low or when shooting under low illumination. Is executed.

The light projection pattern reflected by the subject passes through the focusing optical system 220 and the image blur correcting means 230, passes through the return mirror 121, is reflected by the sub mirror 190, and is guided to the AF sensor 191. AF
In the sensor 191, the defocus amount of the focusing optical system 220 is calculated based on the projection pattern re-imaged on the image sensor as described above, and is output to the camera CPU 110.

The lens CPU 210 has an angular velocity sensor 26 for detecting blur of the photographing optical system with respect to the subject.
1, 262, drive circuits 271 and 272 for driving the image blur correction means 230, and an MR sensor (magnetoresistance sensor) for detecting the position of the image blur correction means 230.
r) 428 and 438 are connected.

The angular velocity sensor 261 detects the angular velocity of the rotational movement of the camera in the vertical direction (vertical direction) in FIG. 2, and outputs a voltage corresponding to the angular velocity in the direction due to camera shake or the like to the lens CPU 210. Angular velocity sensor 262
Is a sensor for detecting the angular velocity of the rotational movement of the camera in a direction (horizontal direction) orthogonal to the paper surface of FIG. 2, and outputs a voltage corresponding to the detected angular velocity to the lens CPU 210.

The image blur correcting means 230 constitutes a part of the photographing optical system, and comprises a correcting optical system for deflecting the optical axis of the photographing optical system and a driving means for driving the correcting optical system.
The driving unit drives the correction optical system based on the control of the lens CPU 210 so as to cancel the movement of the subject image formed by the photographing optical system on the film surface F, and makes the optical axis of the photographing optical system perpendicular to the paper surface. Direction and the direction parallel to the paper,
Deflected independently of each other. A non-volatile memory (EEPROM) 280 is connected to the lens CPU 210, and stores data used for controlling the image blur correction unit 230.

FIG. 3 shows the structure of the image blur correcting means 230. The correction lens 401 constituting the correction optical system is fixed to the first rotation plate 420 while being fitted in the lens frame 410, and the first rotation plate 420 is connected to the second rotation plate 430 via the rotation shaft 421. To be rotatable. Further, the second rotation plate 430 is rotatably attached to the substrate 440 via a rotation shaft 431 projecting 90 degrees away from the rotation shaft 421 about the optical axis O of the photographing optical system. Substrate 440
Are fixed in the interchangeable lens 200.

With the above configuration, the correction lens 401
The rotation of the first and second rotation plates 420 and 430 causes the optical axis O
Are held so as to be displaceable in directions indicated by arrows V (vertical direction in FIG. 2) and H (horizontal direction in FIG. 2) in a plane perpendicular to FIG.

The lens frame 410 has a large diameter part 411 and a small diameter part 412, and the small diameter part 412 is fitted into the opening 422 of the first rotating plate 420. Rotation axis 4 of first rotation plate 420
21 is inserted into a shaft hole 439 formed in the second rotation plate 430. An arm 424 having a screw hole 423 is provided on the opposite side of the rotation shaft 421 across the opening 422.

A screw member 426 connected to the rotating shaft of the motor 425 via a flexible joint is screwed into the screw hole 423. The motor 425 is connected to the second rotating plate 4
It is fixed on 30. When the motor 425 is driven, the first rotation plate 420 is driven to rotate about the rotation shaft 421 in the direction indicated by the arrow V in accordance with the rotation direction of the screw member 426.

At the tip of the drive arm 424, a permanent magnet 4
The MR sensor 428 for detecting the position of the permanent magnet 427 is provided on the second rotating plate 430 so as to face the permanent magnet 427. Lens CPU2
Reference numeral 10 denotes a lens 40 according to an output signal of the MR sensor 428.
The displacement in the direction of arrow V in FIG.

The rotation shaft 431 of the second rotation plate is connected to the substrate 440.
Is inserted into the shaft hole 449 formed in the hole. Second rotating plate 43
0 has an opening 432 through which the small diameter portion 412 is inserted. The opening 432 has a size that does not hinder the movement of the small diameter portion 412 due to the rotation of the first rotation plate 420 when the first rotation plate 420 is assembled to the second rotation plate 430.

A drive arm 434 having a screw hole 433 is provided on the opposite side of the rotation shaft 431 with the opening 432 interposed therebetween. A screw member 436 connected to the rotation shaft of the motor 435 via a flexible joint is screwed into the screw hole 433. When the motor 435 is driven, the second rotation plate 430 is driven to rotate around the rotation shaft 431 in the direction indicated by the arrow H in accordance with the rotation direction of the screw member 436.

At the tip of the drive arm 434, a permanent magnet 4
An MR sensor 438 is provided on the substrate 440. The lens CPU 210 detects the displacement of the lens 401 in the direction of arrow H based on the output signal of the MR sensor 438.

The substrate 440 is provided with an opening 442 through which the small diameter portion 412 is inserted. The opening 442 has a size that does not hinder the movement of the small diameter portion 412 due to the rotation of the first and second rotation plates.

FIG. 4 shows the image blur correcting means 230 viewed from the focusing optical system 220 side in a state where the above-described lens frame 410, first rotating plate 420, second rotating plate 430, and substrate 440 are combined. FIG. FIG. 4 shows a reference state in which the optical axis O of the correction lens 401 coincides with the optical axis of another optical system constituting the photographing optical system. In the reference state, the center of the rotating shaft 421 of the first rotating plate 420, the optical axis O, the permanent magnet 4
27, the MR sensors 428 are arranged on the straight line a. Similarly, the center of the rotation shaft 431 of the second rotation plate 430, the optical axis O, the permanent magnet 437, and the MR sensor 438 are aligned on a straight line b.

As described above, the opening 432 of the second rotating plate 430 has a size that does not hinder the movement of the small-diameter portion 412 due to the rotation of the first rotating plate 420, and the opening 44 of the substrate 440.
Reference numeral 2 has a size that does not hinder movement of the small-diameter portion 412 due to rotation of the first and second rotation plates 420 and 430. In other words, the drive range (correction range) for correcting the image blur of the correction lens 401 is the outer peripheral surface of the small diameter portion 412 and the opening 43.
2, image blur correction means 2 due to collision with the inner wall surface of 442
Considering the load and damage on each member of the small diameter portion 41,
2 and the opening portions 432 and 442 are smaller by a predetermined amount than the driving limit range of the correction lens 401 mechanically defined. As shown in FIG. 4, when the correction lens 401 is in the reference state, its optical axis coincides with the center of the above-described correction range.

FIG. 5 is a diagram showing in detail a portion relating to image blur correction and a communication portion between the interchangeable lens 200 and the camera body 100 in the block diagram of FIG. When the power supply slide lever (not shown) of the camera body 100 is operated in a state where the interchangeable lens 200 is mounted on the camera body 100 and the main switch 141 of the camera CPU 110 is turned on, the power supply contact pins 300C and 300L are connected. Thus, power is also supplied to the lens CPU 210. In the camera CPU 110, information on the ON / OFF of the photometry switch 142 and the release switch 143 linked to the shutter button 101 is converted into 1-bit digital pulses as ports PI1 and PI2 of the camera CPU 110, respectively.
Is input to

The voltage outputs of the angular velocity sensors 261 and 262 are supplied to the A / D conversion ports AD 1 and A 1 of the lens CPU 210.
The voltage output from the MR sensors 428, 438 at D2 is
The signals are input to A / D conversion ports AD3 and AD4, respectively. D / A output ports DA1, D of lens CPU 210
A2 is connected to a motor 425 for driving the first rotating plate 420 and a motor 435 for driving the second rotating plate 430 via the motor driving circuits 271 and 272, respectively. The lens CPU 210 calculates the amount of movement of the correction lens necessary to correct the image blur based on the input signal described above, by converting the amount of movement of the correction lens into the amount of drive of the motor 425 and the motor 435, and drives the lens from the ports DA1 and DA2. Outputs the voltage corresponding to the quantity.

Next, a processing procedure by the camera CPU 110 of the camera body 100 will be described with reference to flowcharts shown in FIGS. When a power supply slide lever (not shown) of the camera body 100 is operated and the main switch 141 is turned on, the processing is started. 6 and 7, the power switch slide lever is operated and the main switch 14 is operated.
1 is turned off and executed until the power supply is stopped. In step S1000, it is checked whether the shutter button is half-pressed and the photometry switch 142 is on. If it is confirmed that the photometry switch 142 is on, the process advances to step S1002.

In step S1002, the photometric sensor 15
An exposure value (Ev) is calculated based on the photometry processing by 0, and an aperture value (A) required for photographing is calculated based on the exposure value.
v) and the exposure time (Tv) are calculated. Step S1
In 004, integration processing of the output voltage of the image sensor provided in the AF sensor 191 is performed, and a voltage signal corresponding to the luminance distribution of the two subject images re-imaged on the light receiving region of the image sensor is output.

Next, in step S1006, a defocus calculation process is executed. That is, the AF sensor 19
AF sensor 19 based on the voltage signal output from
The distance between the two subject images re-imaged on one image sensor is calculated, and the EE connected to the camera CPU 110 is calculated.
The defocus amount is calculated by comparing the distance of the image interval at the time of focusing stored in the PROM 180 (see FIG. 2) in advance. In step S1008, step S1006
Is checked for reliability. If it is determined that the calculation result of the defocus amount calculation is reliable, the process advances to step S1010.

In step S1010, the calculated defocus amount is compared with a predetermined threshold. If the defocus amount is larger than the threshold value, it is determined that the focusing operation is necessary, and the process proceeds to step S1012, where the focusing operation is performed based on the defocus amount. That is, the driving amount and the driving direction of the focusing optical system 220 shown in FIG. 2 are calculated based on the calculated defocus amount.
The calculation result is output to the motor control circuit 192, subjected to signal processing such as amplification, and then output to the AF motor 193. The AF motor 193 is driven by the camera body 100
Is transmitted to the gear block 250 on the interchangeable lens 200 side via the gear block 194 on the side. Gear block 250
Accordingly, the focusing optical system 220 is moved in a predetermined direction and a predetermined amount along the optical axis direction.

If it is determined in step S1008 that the defocus amount calculated in step S1006 is not reliable due to factors such as a low contrast of the subject, the flow advances to step S1014. In step S1014, under the control of the camera CPU 110, near-infrared light is emitted from the ILED 196 of the auxiliary light unit 195, and a stripe light projection pattern is projected on the subject. Next, in step S1016, data (auxiliary light emission ON) indicating that the light emission pattern is being projected is transmitted to the communication bus 301.
Is transmitted to the lens CPU 210 of the interchangeable lens 200 via

Next, in step S1018, step S10
An integration process similar to that of 1004 is performed. Step S1
In the integration process at 018, the light is reflected by the subject and A
This is performed on the light projection pattern re-imaged on the image sensor of the F sensor 191. Step S when integration processing is completed
In step 1020, the emission of near-infrared light from the ILED 196 is stopped. In step S1022, data indicating that the projection of the projection pattern is not performed (auxiliary projection off) is transmitted to the interchangeable lens 200 via the communication bus 301. The data is transmitted to the lens CPU 210. As described above, the start and end of the projection of the projection pattern are determined by the lens C of the interchangeable lens 200.
While notifying the PU 210, the camera CP of the camera main body 100 while the light projection pattern is being projected onto the subject.
In U110, an integration process of the output of the image sensor of the AF sensor is executed.

Next, in step S1024, the defocus amount is calculated based on the calculation result of the integration processing in step S1018. In step S1026,
As in step S1008, the reliability of the defocus amount is checked. If it is determined that the defocus amount is not reliable, the process advances to step S1028 to
Search driving is performed. In the AF search drive, the integration process of the image sensor of the AF sensor 191 and the calculation of the defocus amount based on the integration result are executed while sequentially changing the extension amount of the lens constituting the focusing optical system 220. When the effective defocus amount is calculated, the lens driving of the focusing optical system 220 is executed based on the calculated defocus amount.

When the lens driving of the focusing optical system 220 in steps S1012 and S1028 is completed, the process returns to step S1004. That is, the above-described processing is repeated until it is determined in step S1010 that the defocus amount is equal to or smaller than the threshold.

At step S1010, step S100
If it is confirmed that the defocus amount calculated in step S8 or S1026 is equal to or smaller than the threshold value, it is determined that the focusing optical system 220 is in focus, and step S in FIG.
Proceed to 1030. In step S1030, the state of the photometric switch 142 (see FIGS. 2 and 5) is checked again. If it is confirmed that the photometry switch 142 is off, the process returns to step S1000 in FIG. 6, and the subsequent processing is repeated.
If it is confirmed that the photometry switch 142 is on, the flow advances to step S1032 to release the release switch 143 (see FIG.
5) is confirmed. Shutter button 101
Is not fully pressed and the release switch 143 is confirmed to be off, the process returns to step S1030, where the shutter button 101 is fully pressed, and the release switch 14
If it is confirmed that 3 is ON, the process proceeds to step S1034.

In step S1034, step S10 in FIG.
The aperture value (Av) and the exposure time (T
The following release operation is executed based on v). The quick return mirror 121 is flipped up to the position shown by the broken line in FIG.
The opening degree of the diaphragm of the diaphragm mechanism 240 is adjusted based on the value, and the shutter mechanism 124 is driven in the opening direction. After the exposure time has elapsed, the shutter mechanism 124 is driven in the closing direction via the release control IF 160, and the aperture mechanism 24
The aperture of 0 is opened and the quick return mirror 1
21 is returned to the reflection position, and the release operation ends.
After the release operation in step S1034 is completed, the film F is wound up in step S1036, and the process returns to step S1000.

FIG. 8 shows a lens CPU of the interchangeable lens 200.
4 is a flowchart illustrating a processing procedure of image shake correction control in 210. When power is supplied from the camera body 100 via the contact pins 300C and 300L, the lens CP
U210 starts. In step S1100, "0" is set to an auxiliary light emission flag described later, and the flag is initialized. Next, in step S1102, the camera CPU 110
A routine for checking a communication interrupt request from the server is started. As a result, the port to which the communication bus 301 is connected is constantly monitored by the lens CPU 210, and the presence or absence of an interrupt request is checked.

FIG. 9 shows a camera C via the communication bus 301.
9 is a flowchart illustrating a processing procedure of a check routine on the lens CPU 210 side when a communication interrupt request is issued from a PU 110. When an interrupt request is executed by the camera CPU 110, the transmitted communication data is taken into the lens CPU 210 in step S1200. Next, in step S1202, it is checked whether or not the transmitted communication data is data indicating auxiliary light emission ON. If the communication data is data indicating auxiliary light emission ON, the auxiliary light emission flag is set to "1" in step S1204. You. In step S1206, it is checked whether or not the communication data is data indicating auxiliary light emission OFF. If the communication data is data indicating auxiliary light emission OFF, the auxiliary light emission flag is set to "0" in step S1208.

As described above, when there is an interrupt request from the camera CPU 110, the lens CPU 210 checks the transmitted communication data, and sets a value in the auxiliary light emission flag according to the content.

Returning again to FIG. 8, step S1104
Then, the value of the auxiliary light emission flag is checked. As described above, the case where the auxiliary light projection flag is set to “1” indicates that the light projection pattern is projected onto the subject by the camera CPU 110 via the auxiliary light unit 195. The case where the auxiliary light projection flag is set to “0” means that the auxiliary light unit 195 is not operating in the camera CPU 110 or that the projection of the light emitting pattern is completed even if the auxiliary light unit 195 is operated. This is the case. If "0" is set in the auxiliary light emission flag, the process advances to step S1106 to execute a blur detection process.

The blur detection in step S1106 is performed as follows. The angular velocity signal in the V direction output from the angular velocity sensor 261
The signal is input to the conversion port AD1 and A / D converted. A / D
The converted digital signal is integrated by the lens CPU 210 to calculate an angle signal in the V direction. The driving direction and the driving amount of the first rotating plate 420 along the V direction are calculated based on the V direction angle signal. Similarly, the angular velocity signal in the H direction output from the angular velocity sensor 262 is input to the AD conversion port AD2 of the lens CPU 210, and A / A
D conversion is performed. The A / D-converted digital signal is integrated by the lens CPU 210 to calculate an angle signal in the H direction. Based on the angle signal in the H direction, the driving direction and the driving amount of the second rotating plate 430 along the H direction are calculated.

Next, in step S1108, a correction lens driving process is performed. The analog signal of the MR sensor 428 indicating the current position of the first rotating plate 420 in the V direction is A / A
The digital value is read from the D conversion port AD3 and indicates a current position in the V direction. Similarly, an analog signal of the MR sensor 438 indicating the current position of the second rotating plate 430 in the H direction is read from the A / D conversion port AD4,
A digital value indicating the current position in the H direction is calculated.

Based on the driving direction and the driving amount of the first rotating plate 420 along the V direction and the digital value indicating the current position of the first rotating plate 420 in the V direction, the motor 42
5 is calculated. Similarly, the second rotating plate 430
The drive amount of the motor 435 is calculated based on the drive direction and the drive amount along the H direction and the digital value indicating the current position of the second rotating plate 430 in the H direction.

The driving amount of the motor 425 is converted into an analog signal by the D / A conversion port DA1 and is converted into an analog signal.
71. The analog signal output from the D / A conversion port DA1 is amplified by the motor drive circuit 271 and then output to the motor 425. The motor 425 swings and drives the first rotating plate 420 based on the input analog signal. As a result, the correction lens 401 is driven so as to cancel the vertical component of the image blur caused by the camera shake.

The driving amount of the motor 435 is converted into an analog signal by the D / A conversion port DA2,
72. The analog signal output from the D / A conversion port DA2 is amplified by the motor drive circuit 272 and then output to the motor 435. The motor 435 swings and drives the second rotating plate 430 based on the input analog signal. As a result, the correction lens 401 is driven to cancel the horizontal component of the image blur caused by the camera shake.

On the other hand, if it is confirmed in step S1104 that the auxiliary light emission flag is set to "1", the flow advances to step S1110, where the correction lens 401 is set.
Is stopped. That is, the lens CP
Under the control of U210, D / A conversion ports DA1 and D / A
The output of A2 is set to "0". As a result, the driving of the correction lens 401 in the vertical and horizontal directions is stopped.

As described above, in the first embodiment, on the camera body 100 side, the data of the auxiliary light emission ON and OFF is transmitted to the interchangeable lens 200 in accordance with the start and end of the operation of the auxiliary light unit 195. . On the interchangeable lens 200 side,
The drive of the correction lens 401 in the image blur correction control is stopped while receiving the data of the auxiliary light emission ON and detecting that the auxiliary light is being projected on the camera body 100 side. As a result, an effective defocus amount is calculated in the defocus calculation using the light projection pattern.

FIG. 10 is a block diagram of a compact camera 500 to which the second embodiment according to the present invention is applied.
The camera 500 includes a shutter button 501, a focusing optical system 502, an image blur correction unit 230 similar to that of the first embodiment, a quick return mirror 503, a sub mirror 504, a pentaprism 505, an AF sensor 506, and a film F on which a subject image is formed. And a CPU 510 for controlling the entire camera 500. Note that the photographing optical system of the camera 500 includes a focusing optical system 502, a correction lens 401 of the image blur correction unit 230, and a variable power optical system (not shown). Object light is focusing optical system 5
02, after passing through the correction lens 401, the light enters the quick return mirror 503. Quick return mirror 503
Is reflected by the pentaprism 505 to the photographer's eyes, and the subject light transmitted through the quick return mirror 503 is reflected by the sub-mirror 504 and guided to the AF sensor 506.

The shutter button 501 is the same as the shutter button 101 of the camera body 100 of the first embodiment.
The switch is a step switch. When the switch is pressed one step, the photometric switch is turned on, and when the switch is pressed two steps, the release switch is turned on. The ON / OFF information of these switches is input to the CPU 510.

The camera 500 is provided with the same angular velocity sensors 261 and 262 as in the first embodiment for detecting the movement of the photographing optical system with respect to the subject, and detects the movement of the lens in the photographing optical system in the optical axis direction. Lens movement detecting means 5
07 is provided.

As in the first embodiment, the angular velocity sensor 261
And 262, a voltage corresponding to the detected angular velocity is output from the CPU.
Output to 510. Further, the image blur correction means 230
As in the first embodiment, the correction lens 401 is provided in the camera 500 so as to form a part of the photographing optical system.

The CPU 510 includes the angular velocity sensors 261, 2
Image blur correction means 230 based on the input signal from
Is driven to correct the image blur on the film surface F and in the viewfinder visual field.

Although the focusing optical system 502 is shown as a single lens in FIG. 10, it is actually composed of a plurality of lenses or a plurality of lens groups, and some or all of them are used for focusing. Are movable in the optical axis direction. In the second embodiment, the lens movement detecting unit 5
Reference numeral 07 detects the movement of the lens constituting the focusing optical system 502.

When observing the subject, the quick return mirror 503 is positioned at the position shown in FIG. Accordingly, the focusing optical system 502 and the correction lens 4 of the image blur correction unit 230 respectively constitute a part of the photographing optical system.
The luminous flux of the subject that enters through 01 is reflected by the quick return mirror 503 and guided to the focusing screen B. The image of the subject on the reticle B is inverted by the pentaprism 505, and the observer can observe the image on the reticle B via the eyepiece lens 508 as an erect image. That is, in the second embodiment, the finder optical system includes a focusing optical system 502, a correction lens 401, a quick return mirror 503, a reticle B, and a pentaprism 5.
05, an eyepiece lens 508 is provided.

The quick return mirror 503 and the sub mirror 504 have a mirror driving mechanism (not shown) at the time of photographing.
Is retracted to a position facing the reticle B. As a result, at the time of shooting, the luminous flux of the subject is shifted by the focusing optical system 5.
02, guided to the film surface F via the correction lens 401, and a subject image is formed on the film surface F. In this manner, the subject image is exposed on the film surface F, and the recording of the subject image is performed.

The focusing lens is configured to move in the optical axis direction by a known cam mechanism (not shown) by rotating the lens barrel 509. The lens barrel 509 is rotated by a motor provided on the body or the lens unit of the camera 500 or by a manual operation of the focusing operation ring 511 of the photographer himself.

The AF sensor 506 is a sensor that detects the defocus amount of the photographing optical system by a phase difference detection method, similarly to the AF sensor 191 of the camera body 100 of the first embodiment.

The lens movement detecting means 507 includes a lens barrel 509
, A pinion gear 512 that meshes with a rack 509a provided on the outer periphery of the device, a slit plate 513 provided coaxially with the pinion gear 512, and a photo interrupter 514 provided with the slit plate 513 interposed therebetween. The slit plate 513 is provided with a number of slits radially about the rotation axis. The photo interrupter 514 includes a light emitting unit 513a and a light receiving unit 513b opposed to each other with the slit plate 513 interposed therebetween, and a periodic signal corresponding to the brightness of light with the rotation of the slit plate 513 from the light receiving unit 513b. Is output. As described above, the lens barrel 509 is the camera 5 in the case of auto focus.
The camera is rotated by a motor provided in the body or lens unit of the camera 00. In the case of manual focusing, the camera is manually rotated by the photographer. Therefore, the slit plate 5 interlocked with the rotation of the lens barrel 509 due to focusing.
A pulse signal is output from the light receiving unit 513b according to the rotation of the thirteen.

The CPU 510 has the same configuration as in the first embodiment.
An auxiliary light unit 195 including an ILED 196, a contrast pattern 197, and a projection optical system 198 is connected. AF such as when the contrast of the brightness of the subject is low
When an effective defocus amount cannot be obtained by the calculation by the sensor 506, the auxiliary light unit 195 is driven under the control of the CPU 510.

FIG. 11 is a block diagram illustrating input / output signals of CPU 510. Inputs to the corresponding ports of the photometry switch 521 and the release / on / off information of the release switch 522, the voltage outputs of the angular velocity sensors 261 and 262, and the voltage outputs from the MR sensors 428 and 438, which are linked to the shutter button 501, The description is omitted because it is similar to that of the first embodiment. Also, the motor 425
The outputs from the corresponding ports to the motor drive circuit 271 connected to the motor drive circuit 271 and the motor drive circuit 272 connected to the motor 435 are also the same as those in the first embodiment, and therefore description thereof is omitted.

The output signal of the photo interrupter 514 is
An AF sensor 50 is connected to the port PI3 for detecting a pulse input.
6 are respectively input to the port PI4. The port PO has an IL of the auxiliary light unit 195.
The ED 196 is connected, and an output signal for emitting near-infrared light from the ILED 196 is output from the port PO.

Referring to FIG. 12 to FIG.
The processing procedure by the PU 510 will be described. When power is supplied to the camera 500, the process starts, and the process proceeds to step S130.
At 0, the state of the photometric switch 521 is checked. If the shutter button 501 is half-pressed and the photometry switch 521 is on, the process advances to step S1302.

In step S1302, a timer for starting interrupt processing every 1 ms (millisecond) is started. As a result, while the subsequent processing is being executed,
The image blur correction subroutine described later is repeatedly started every 1 ms.

Next, photometric processing is performed in step S1304. That is, an exposure value (Ev) is calculated based on photometric processing by a photometric sensor (not shown), and an aperture value (Av) and an exposure time (Tv) required for photographing are calculated based on the exposure value.

Steps S1306 to S1314 are:
The same processing as the processing by the camera CPU 110 of the first embodiment shown in FIG. 6 is executed. In step S1306, integration processing of the output voltage of the image sensor provided in the AF sensor 506 is performed, and a voltage signal corresponding to the luminance information of the two subject images re-imaged on the light receiving region of the image sensor is output. . Next, in step S1308, based on the voltage signal output from the AF sensor 506, the distance between the two subject images re-imaged on the image sensor of the AF sensor 191 is calculated, and the EEPROM (not shown) of the CPU 510 is used. The defocus amount is calculated by comparing the distance of the image interval at the time of focusing, which is stored in advance in FIG. In step S1310, the reliability of the calculation result in step S1308 is checked. If it is determined that the calculation result of the defocus amount calculation is reliable, the process advances to step S1312.
In step S1312, the defocus amount is compared with a predetermined threshold, and if it is larger than the threshold, step S1314
To the lens barrel 509 based on the defocus amount.
(See FIG. 10) is driven.

If it is determined in step S1310 that the calculation result of the defocus amount calculation is not reliable, the flow advances to step S1316. In step S1316, a voltage is output from the port PO (see FIG. 11) to the ILED 196, and near-infrared light is emitted from the ILED 196. As a result, a stripe-shaped projection pattern is projected on the subject via the contrast pattern 197 and the projection optical system 198.

Next, in step S1318, integration processing is performed on the two images of the light projection pattern reflected from the subject and re-imaged on the image sensor of the AF sensor 191. When the integration process ends, the voltage output from the port PO to the ILED 196 is stopped in step S1320, and the projection of the light projection pattern ends.

In step S1322, step S13
Step S1308 based on the result of the integration processing of No. 18.
The defocus amount is calculated in the same manner as. Next, in step S1324, the reliability of the defocus amount is checked. If it is determined that the calculation result of the defocus amount is reliable, the process proceeds to step S1312. If it is determined that the defocus amount is not reliable, the process proceeds to step S1326. Step S1
At 326, AF search driving similar to that at step S1028 in FIG. 6 is performed, and the process returns to step S1306.

In step S1312, step S130
If it is confirmed that the defocus amount calculated in step S1322 or S1322 is equal to or smaller than the threshold value, step S13 in FIG.
Proceed to 28. In step S1328, the photometric switch 5
The state of 21 (see FIG. 11) is confirmed again. If it is confirmed that the photometry switch 521 is off, step S13
Proceed to 30. In step S1330, the timer set in step S1302 in FIG. 12 is stopped, the process returns to step S1300 in FIG. 12, and the subsequent processing is repeated. That is, while the photometry switch 521 is off, the image blur correction subroutine is not executed.

In step S1328, the photometric switch 521
Is turned on, the flow advances to step S1332 to check the state of the release switch 522 (see FIG. 11). If it is confirmed that the shutter button 501 is not fully pressed and the release switch 522 is off, the process returns to step S1328, and if it is confirmed that the shutter button 501 is fully pressed and the release switch 522 is on, the process proceeds to step S1334.

In step S1334, the same release operation as in the first embodiment (step S1034 in FIG. 7) is performed. The flip-up drive of the quick return mirror 503, the adjustment of the aperture of the aperture mechanism based on the aperture value (Av) calculated in step S1304 of FIG. 12, and the driving of the shutter mechanism in the opening direction are performed.
When the exposure time (Tv) calculated in step S1304 has elapsed, the shutter mechanism is driven in the closing direction and the aperture is opened, the quick return mirror 503 is returned to the reflection position shown in FIG. 10, and the release operation ends. I do. When the release operation in step S1334 ends, in step S1336, the film F is wound up, and the process returns to step S1300 in FIG.

FIG. 14 shows an image blur correction subroutine executed every 1 ms when the timer is set in step S1302 in FIG. In step S1400, the state of port PO (see FIG. 11) is confirmed. Port P
If it is confirmed that there is no voltage output from O and no near-infrared light is emitted from the ILED 196, that is, it is confirmed that the light projection pattern is not projected on the subject, step S1402
To execute the shake detection calculation, and then to step S1
In 404, the driving of the correction lens 401 is executed. The processing in steps S1402 and S1404 is the same as that in FIG.
Steps S1106 and S1108 in FIG.

In step S1400, when it is confirmed that a voltage is output from port PO and near-infrared light is emitted from ILED 196, that is, that the light projection pattern is projected on the subject, the flow advances to step S1406. Proceed,
The driving of the correction lens 401 is stopped. Correction lens 40
1 is stopped by setting the outputs of the D / A conversion ports DA1 and DA2 of the CPU 510 to "0" as in the first embodiment.

As described above, in the second embodiment,
During the photometric processing and the release operation, image blur correction is performed every 1 ms. However, when the light projection pattern is projected on the subject via the auxiliary light unit 195, the correction lens 4
01 is stopped. As a result, the AF sensor 506
The effective defocus amount is calculated in the defocus calculation using the light projection pattern according to.

[0090]

As described above, according to the present invention, highly accurate auto-focusing is always performed in a camera having an image blur correction function.

[Brief description of the drawings]

FIG. 1 is a front view of a single-lens reflex camera to which a first embodiment according to the present invention is applied;

FIG. 2 is a block diagram of the single-lens reflex camera according to the first embodiment.

FIG. 3 is an exploded perspective view of an image blur correction mechanism provided in the single-lens reflex camera of the first embodiment.

FIG. 4 is a front view showing the image blur correction mechanism of FIG. 3 as viewed from a focusing optical system side.

FIG. 5 is a diagram showing in detail a portion relating to image blur correction and a communication portion between the interchangeable lens and the camera body in the block diagram of FIG. 2;

FIG. 6 is a flowchart illustrating a processing procedure up to focusing of a photographing optical system in the camera body of the first embodiment.

FIG. 7 is a flowchart showing a processing procedure from focusing of an imaging optical system to winding of a film in the camera body of the first embodiment.

FIG. 8 is a flowchart illustrating a processing procedure of image blur correction in the interchangeable lens according to the first embodiment.

FIG. 9 is a flowchart illustrating a processing procedure when an interrupt request is issued from the camera body in the interchangeable lens.

FIG. 10 is a block diagram of a compact camera to which a second embodiment according to the present invention is applied.

FIG. 11 is a block diagram showing an input / output part to a CPU of the compact camera according to the second embodiment.

FIG. 12 is a flowchart illustrating a processing procedure up to focusing of a photographing optical system in the compact camera according to the second embodiment.

FIG. 13 illustrates a compact camera according to a second embodiment.
6 is a flowchart illustrating a processing procedure from focusing of a shooting optical system to winding of a film.

FIG. 14 shows a compact camera according to a second embodiment.
It is a flowchart which shows the processing procedure of the subroutine started every 1 ms.

[Explanation of symbols]

 Reference Signs List 100 Camera body 110 Camera CPU 121 Quick return mirror 141 Main switch 142 Photometric switch 143 Release switch 150 Photometric sensor 195 Auxiliary light unit 196 ILED 197 Contrast pattern 198 Projection optical system 200 Interchangeable lens 210 Lens CPU 220 Focusing optical system 230 Image blur correction means 240 Aperture mechanism 261, 262 Angular velocity sensor 271, 272 Motor drive circuit 301 Communication bus 401 Correction lens 420 First rotating plate 430 Second rotating plate 428, 438 MR sensor 500 Compact camera

Claims (4)

[Claims] 1. An imaging optical system comprising a plurality of optical systems, auxiliary light projecting means for projecting auxiliary light having a predetermined light projection pattern toward an object, and the object formed via the imaging optical system A camera comprising: a defocus amount detection unit that detects a defocus amount of the optical image; and a focusing unit that drives the photographing optical system so that the optical image is focused based on the defocus amount. A camera shake detection unit that detects a shake of an optical axis of the imaging optical system, a correction optical system for correcting image blur included in the imaging optical system, a driving unit that drives the correction optical system, A drive control unit that controls the drive unit based on the shake of the optical axis detected by the shake detection unit so that the shake of the optical image caused by the shake of the optical axis is canceled. There are, said drive control means, wherein while the auxiliary light projecting means is operating, the image blur correction apparatus, characterized in that stops the driving of said correction optical system according to the driving means. 2. A camera body having an automatic focus detection function for projecting auxiliary light having a predetermined light projection pattern toward a subject and detecting a defocus amount of an optical image of the subject based on the reflected light. An imaging optical system having a correction optical system for correcting image blur, forming the optical image on an imaging medium provided in the camera body, and an optical axis of the imaging optical system. A blur detecting unit that detects blur, a driving unit that drives the correction optical system, and a blur detecting unit that detects the blur of the optical image caused by the blur of the optical axis of the photographing optical system. Drive control means for controlling the drive means based on the deviation of the optical axis, and camera operation state detection means for detecting whether or not the camera body is projecting the auxiliary light. The photographing lens, wherein the means stops the driving means while the camera operation state detecting means detects that the auxiliary light is being projected. 3. A camera body to which a photographing lens is attached, wherein the focus detecting means detects a defocus amount of an optical image of a subject formed through the photographing lens, and the defocusing by the focus detecting means. Auxiliary light projection means for projecting auxiliary light having a predetermined light projection pattern toward the subject to assist in the detection of the amount; and the optical image based on the defocus amount detected by the focus detection means. Lens drive amount calculation means for calculating a drive amount of the photographic lens so that the photographic lens is in focus; and when the auxiliary light projection means operates, the photographic lens supplies information indicating that the auxiliary light is being projected onto the subject. A camera body, comprising: an information transmission unit that transmits information to the camera body. 4. An image pickup optical system including a correction optical system for correcting image blur, a shake detection unit for detecting a shake of an optical axis of the image pickup optical system, a drive unit for driving the correction optical system, and the shake A photographing lens comprising: a driving control unit that controls the driving unit based on the deviation of the optical axis detected by a detecting unit; and a photographing lens formed through the photographing optical system in a state where the photographing lens is mounted. A defocus amount detecting means for detecting a defocus amount of an optical image of the subject; and an auxiliary light having a predetermined light projection pattern directed to the subject to assist detection of the defocus amount by the defocus amount detecting means. A camera body comprising: an auxiliary light projecting unit for projecting and projecting; and a focusing unit for driving the photographing optical system so that the optical image is focused based on the defocus amount. Communication means for transmitting data between the taking lens and the camera body in a state where the taking lens is mounted on the camera body, wherein the auxiliary light projection means operates in the camera body; Information indicating that the auxiliary light is being projected onto the subject is transmitted from the camera body to the photographing lens via the communication unit, and the driving unit is stopped by the drive control unit in the photographing lens. Characterized camera system.