JP6741095B2 - interchangeable lens - Google Patents

Description

The present invention relates to an interchangeable lens.

BACKGROUND ART Conventionally, there is known a technique of detecting a focus state of an optical system by calculating an evaluation value regarding contrast by an optical system while driving a focus adjustment lens at a predetermined driving speed in the optical axis direction (for example, See Patent Document 1).

JP, 2010-139666, A

The problem to be solved by the present invention is to provide an interchangeable lens capable of suitable image pickup.

The present invention solves the above problems by the following means.

[1] An interchangeable lens according to a first aspect of the present invention is an interchangeable lens attached to a camera body, comprising an optical system including a focus adjusting lens, and driving the focus adjusting lens in an optical axis direction of the optical system. A first value at the lens position of the focus adjustment lens of an image plane movement coefficient that varies depending on the drive unit and the position of the focus adjustment lens and that corresponds to the amount of movement of the image plane with respect to the movement amount of the focus adjustment lens. And within the drive range of the focus adjustment lens by the drive unit,
And a second value smaller than the image plane movement coefficient that maximizes the amount of movement of the image plane with respect to the amount of movement of the focus adjustment lens, to the camera body.

According to the present invention, it is possible to provide an interchangeable lens capable of suitable imaging.

FIG. 1 is a perspective view showing a camera according to this embodiment. FIG. 2 is a main part configuration diagram showing the camera according to the present embodiment. FIG. 3 is a table showing the relationship between the lens position (focal length) of the zoom lens and the lens position (shooting distance) of the focus lens, and the image plane movement coefficient K. 4, the lens position of the zoom lens (focal length) and the minimum image plane shift factor K _{mi n} and the maximum image plane shift factor K _max, and correcting the minimum image plane shift factor K _{min_x} and correcting the maximum image plane shift factor K _{max_x} It is a table showing a relationship with. FIG. 5 is a schematic diagram showing the details of the connection units 202 and 302. FIG. 6 is a diagram illustrating an example of command data communication. FIG. 7 is a diagram illustrating an example of hotline communication. FIG. 8 is a flowchart showing an operation example of this embodiment. FIG. 9 is a diagram for explaining the play amount G of the drive transmission mechanism of the focus lens 33. FIG. 10 is a diagram showing the relationship between the focus lens position and the focus evaluation value and the relationship between the focus lens position and time when the focusing operation based on the scanning operation and the contrast detection method according to the present embodiment is performed. is there. FIG. 11 is a flowchart showing the operation of the third embodiment. FIG. 12 is a flowchart showing the clip operation according to the fourth embodiment. FIG. 13 is a diagram for explaining the relationship between the lens driving speed V1a of the focus lens and the silent sound lower limit lens moving speed V0b. FIG. 14 is a flowchart showing a clip operation control process according to the fourth embodiment. FIG. 15 is a diagram for explaining the relationship between the image plane moving speed V1a of the focus lens and the silent minimum image plane moving speed V0b_max. FIG. 16 is a diagram showing the relationship between the moving speed V1a of the image plane at the time of focus detection and the clipping operation. FIG. 17 is a diagram for explaining the relationship between the lens driving speed V1a of the focus lens and the clipping operation. FIG. 18 is a table showing the relationship between the lens position (focal length) of the zoom lens 32 and the lens position (shooting distance) of the focus lens 33, and the image plane movement coefficient K used in the fourth embodiment. FIG. 19 is a diagram showing a drive range of the focus lens 33. FIG. 20 is a diagram for explaining a method of correcting the minimum image plane movement coefficient K _min according to temperature. FIG. 21 is a diagram for explaining a method of correcting the minimum image plane movement coefficient K _min according to the driving time of the lens barrel 3. FIG. 22 is a diagram for explaining the maximum predetermined coefficient K0 _max and the minimum predetermined coefficient K0 _min . FIG. 23 is a diagram showing an example of manufacturing variation of the lens barrel 3. FIG. 24 is a main part configuration diagram showing a camera according to another embodiment.

<<First Embodiment>>
FIG. 1 is a perspective view showing a single-lens reflex digital camera 1 of this embodiment. In addition, FIG.
It is a principal part block diagram which shows the camera 1 of this embodiment. The digital camera 1 of the present embodiment (hereinafter,
It is simply called camera 1. ) Is composed of a camera body 2 and a lens barrel 3, and the camera body 2 and the lens barrel 3 are detachably coupled to each other.

The lens barrel 3 is an interchangeable lens that can be attached to and detached from the camera body 2. As shown in FIG. 2, the lens barrel 3 incorporates a photographing optical system including lenses 31, 32, 33, 34, 35 and a diaphragm 36.

The lens 33 is a focus lens, and the focal length of the photographing optical system can be adjusted by moving in the optical axis L1 direction. The focus lens 33 has an optical axis L1 of the lens barrel 3.
The focus lens drive motor 331 adjusts the position while the focus lens encoder 332 detects the position.

The focus lens drive motor 331 is, for example, an ultrasonic motor, and the lens control unit 3
The focus lens 33 is driven in accordance with the electric signal (pulse) output from 7. Specifically, the drive speed of the focus lens 33 by the focus lens drive motor 331 is
The drive speed of the focus lens 33 increases as the number of pulses per unit time increases. In the present embodiment, the camera control unit 21 of the camera body 2 transmits the drive instruction speed (unit: pulse/second) of the focus lens 33 to the lens barrel 3, and the lens control unit 37 causes the camera body 2 to move. By outputting a pulse signal according to the transmitted drive instruction speed (unit: pulse/second) to the focus lens drive motor 331, the focus lens 33 is driven by the drive instruction speed (unit: pulse) transmitted from the camera body 2. /Second).

Further, the lens 32 is a zoom lens, and by moving in the optical axis L1 direction, the focal length of the photographing optical system can be adjusted. As with the focus lens 33 described above, the zoom lens 32 is adjusted in position by the zoom lens drive motor 321 while being detected by the zoom lens encoder 322. The position of the zoom lens 32 is adjusted by operating a zoom button provided on the operation unit 28 or by operating a zoom ring (not shown) provided on the camera barrel 3.

Further, the lens 34 is a blur correction lens, and by moving in a direction orthogonal to the optical axis L1, it is possible to prevent deterioration of a captured image due to camera shake. The position of the shake correction lens 34 is adjusted by a shake correction lens drive unit 341 such as a pair of voice coil motors. The camera shake correction lens 34 is driven, for example, when the camera shake is detected by the camera controller 37 based on the output of a gyro sensor (not shown) or the like.
It is performed based on the output of 7.

The diaphragm 35 is configured so that the aperture diameter around the optical axis L1 can be adjusted in order to limit the amount of light flux of the light flux that passes through the image pickup optical system and reaches the image sensor 22 and adjust the amount of blur. The aperture diameter is adjusted by the diaphragm 35, for example, by sending an appropriate aperture diameter calculated in the automatic exposure mode from the camera control unit 21 via the lens control unit 37. Further, the set aperture diameter is input from the camera control unit 21 to the lens control unit 37 by manual operation by the operation unit 28 provided in the camera body 2. The aperture diameter of the diaphragm 35 is detected by a diaphragm aperture sensor (not shown), and the lens controller 37 recognizes the current aperture diameter.

The lens memory 38 stores the image plane movement coefficient K. The image plane movement coefficient K is a value indicating the correspondence between the drive amount of the focus lens 33 and the image plane movement amount, and is, for example, the ratio of the drive amount of the focus lens 33 and the image plane movement amount. The details of the image plane movement coefficient K stored in the lens memory 38 will be described later.

On the other hand, the camera body 2 includes a mirror system 220 for guiding the light flux from the subject to the image sensor 22, the finder 235, the photometric sensor 237, and the focus detection module 261. The mirror system 220 includes a quick return mirror 221 that rotates around a rotation axis 223 by a predetermined angle between an observation position and an imaging position of a subject, and the quick return mirror 221.
Sub-mirror 222 which is pivotally supported by and rotates in accordance with the rotation of the quick return mirror 221.
With. In FIG. 1, the state in which the mirror system 220 is at the observation position of the subject is indicated by a solid line, and the state in which the mirror system 220 is at the imaging position of the subject is indicated by a two-dot chain line.

The mirror system 220 is inserted into the optical path of the optical axis L1 in the observation position of the subject, and rotates so as to retract from the optical path of the optical axis L1 in the imaging position of the subject.

The quick return mirror 221 is composed of a half mirror, and in the state in which the subject is in the observation position, a part of the light flux (optical axis L2, L3) of the light flux (optical axis L2) from the subject is reflected by the quick return mirror 221. The light is guided to the finder 235 and the photometric sensor 237, and a part of the light flux (optical axis L4) is transmitted to be guided to the sub mirror 222. On the other hand, submirror 2
Reference numeral 22 denotes a total reflection mirror, which is a light beam (optical axis L) transmitted through the quick return mirror 221.
4) is led to the focus detection module 261.

Therefore, when the mirror system 220 is at the observation position, the light flux from the subject (optical axis L1)
Is guided to the finder 235, the photometric sensor 237 and the focus detection module 261, the subject is observed by the photographer, and the exposure calculation and the focus adjustment state of the focus lens 33 are detected. Then, when the photographer fully presses the release button, the mirror system 220 rotates to the photographing position, all the luminous flux (optical axis L1) from the subject is guided to the image pickup element 22, and the photographed image data is stored in the memory 24. ..

The light flux (optical axis L2) from the subject, which is reflected by the quick return mirror 221, forms an image on the focusing screen 231 arranged on a surface optically equivalent to the image pickup element 22, and the pentaprism 233 and the eyepiece lens 234. It is observable through. At this time, the transmissive liquid crystal display 232
Displays a focus detection area mark and the like superimposed on the subject image on the focusing screen 231, and displays information related to shooting such as shutter speed, aperture value, and number of shots in an area outside the subject image. With this, the photographer can observe the subject, the background thereof, photographing-related information, and the like through the viewfinder 235 in the photographing preparation state.

The photometric sensor 237 is composed of a two-dimensional color CCD image sensor or the like, and in order to calculate the exposure value at the time of shooting, divides the shooting screen into a plurality of areas and outputs a photometric signal according to the brightness of each area. The signal detected by the photometric sensor 237 is output to the camera controller 21 and used for automatic exposure control.

The image pickup element 22 is on the optical axis L1 of the light flux from the subject of the camera body 2, and the lens 3
It is provided on the planned focal plane of the taking optical system including 1, 32, 33 and 34, and the shutter 23 is provided on the front surface thereof. The image pickup device 22 has a plurality of photoelectric conversion devices arranged two-dimensionally, and can be composed of a device such as a two-dimensional CCD image sensor, a MOS sensor or a CID. The image signal photoelectrically converted by the image sensor 22 is transferred to the camera controller 2
After being image-processed in 1, it is recorded in the camera memory 24 which is a recording medium. As the camera memory 24, either a removable card type memory or a built-in type memory can be used.

Further, the camera control unit 21 detects the focus adjustment state of the photographing optical system by the contrast detection method based on the pixel data read from the image sensor 22 (hereinafter, referred to as “contrast A as appropriate”).
F". )I do. For example, the camera control unit 21 reads the output of the image sensor 22 and calculates the focus evaluation value based on the read output. This focus evaluation value can be obtained, for example, by extracting the high frequency component of the output from the image sensor 22 using a high frequency transmission filter. It can also be obtained by extracting the high-frequency component using two high-frequency transmission filters having different cutoff frequencies.

Then, the camera control unit 21 sends a drive signal to the lens control unit 37 to drive the focus lens 33 at a predetermined sampling interval (distance), obtains a focus evaluation value at each position, and the focus evaluation value is the maximum. Then, the focus detection by the contrast detection method is performed, in which the position of the focus lens 33 is calculated as the in-focus position. The focus position is, for example,
When the focus evaluation value is calculated while driving the focus lens 33, the focus evaluation value is 2
After rising twice and then falling twice, the focus evaluation values can be used to perform calculations such as interpolation.

In the focus detection by the contrast detection method, the sampling interval of the focus evaluation value increases as the driving speed of the focus lens 33 increases, and when the driving speed of the focus lens 33 exceeds a predetermined speed, the sampling interval of the focus evaluation value. Becomes too large, and it becomes impossible to properly detect the in-focus position. This is because the larger the sampling interval of the focus evaluation value, the larger the variation of the in-focus position and the in-focus accuracy may deteriorate. Therefore, the camera control unit 21 drives the focus lens 33 so that the moving speed of the image plane when the focus lens 33 is driven becomes a speed at which the focus position can be appropriately detected. For example, in the search control for driving the focus lens 33 to detect the focus evaluation value, the camera control unit 21 can detect the in-focus position appropriately, and can detect the focus position appropriately. So that the driving speed is
The focus lens 33 is driven. The search control includes, for example, wobbling, a neighborhood search (a neighborhood scan) that searches only the neighborhood of a predetermined position, and a whole area search (a whole area scan) that searches the entire drive range of the focus lens 33.

Further, the camera control unit 21 drives the focus lens 33 at a high speed when starting the search control triggered by the half-press of the release switch, and starts the search control triggered by a condition other than the half-press of the release switch. Alternatively, the focus lens 33 may be driven at a low speed. By controlling in this way, the contrast AF can be performed at high speed when the release switch is half-pressed, and the contrast AF in which the through image looks good can be performed when the release switch is not half-pressed. Is.

Further, the camera control unit 21 may control the focus lens 33 to be driven at high speed in the search control in the still image shooting mode, and to drive the focus lens 33 at low speed in the search control in the moving image shooting mode. By controlling in this way,
This is because it is possible to perform high-speed contrast AF in the still image shooting mode, and to perform contrast AF in which the appearance of the moving image is favorable in the moving image shooting mode.

Further, in at least one of the still image shooting mode and the moving image shooting mode, high-speed contrast AF may be performed in the sports shooting mode, and low-speed contrast AF may be performed in the landscape shooting mode. Further, the drive speed of the focus lens 33 in the search control may be changed according to the focal length, the shooting distance, the aperture value, and the like.

Further, in this embodiment, focus detection can be performed by the phase difference detection method. Specifically, the camera body 2 includes a focus detection module 261, and the focus detection module 26
Reference numeral 1 denotes a pair of line sensors (not shown) in which a plurality of pixels each having a microlens arranged near the planned focal plane of the imaging optical system and a photoelectric conversion element arranged for the microlens are arranged. Have Then, a pair of light fluxes passing through a pair of regions having different exit pupils of the focus lens 33 are received by each pixel arranged in the pair of line sensors, whereby a pair of image signals can be obtained. Then, the phase shift of the pair of image signals acquired by the pair of line sensors can be obtained by a well-known correlation calculation to perform focus detection by the phase difference detection method for detecting the focus adjustment state.

The operation unit 28 is an input switch for the photographer to set various operation modes of the camera 1, such as a shutter release button and a moving image shooting start switch. The focus mode can be switched, and further, the AF-S mode/AF-F mode can be switched among the autofocus modes. Various modes set by the operation unit 28 are sent to the camera control unit 21, and the camera control unit 21 controls the operation of the entire camera 1. Further, the shutter release button includes a first switch SW1 which is turned on when the button is pressed halfway and a second switch SW2 which is turned on when the button is fully pressed.

Here, in AF-S mode, when the shutter release button is pressed halfway, based on the focus detection result, after driving the focus lens 33, the position of the focus lens 33 once adjusted is fixed, This is a mode for shooting at the focus lens position. In addition,
The AF-S mode is a mode suitable for still image shooting, and is usually selected when performing still image shooting. In the AF-F mode, the focus lens 33 is driven based on the focus detection result regardless of whether or not the shutter release button is operated, and then the focus state is repeatedly detected. When the focus state changes, In this mode, the scan drive of the focus lens 33 is performed. The AF-F mode is a mode suitable for shooting moving images, and is usually selected when shooting moving images.

Further, in the present embodiment, a switch for switching between the one-shot mode and the continuous mode may be provided as a switch for switching between the autofocus modes. Then, in this case, when the one-shot mode is selected by the photographer, the AF-S mode is set, and when the continuous mode is selected by the photographer, the AF-F mode is set. Can be configured to be set to.

Next, regarding the image plane movement coefficient K stored in the lens memory 38 of the lens barrel 3,
explain.

The image plane movement coefficient K is a value indicating the correspondence between the drive amount of the focus lens 33 and the image plane movement amount, and is, for example, the ratio of the drive amount of the focus lens 33 and the image plane movement amount. In the present embodiment, the image plane movement coefficient is obtained, for example, by the following equation (1), and the smaller the image plane movement coefficient K, the larger the amount of movement of the image plane accompanying the driving of the focus lens 33.
Image plane movement coefficient K=(driving amount of focus lens 33/moving amount of image plane) (1)
Further, in the camera 1 of the present embodiment, even if the drive amount of the focus lens 33 is the same, the amount of movement of the image plane varies depending on the lens position of the focus lens 33. Similarly, even if the drive amount of the focus lens 33 is the same, the zoom lens 32
The amount of movement of the image plane varies depending on the lens position, that is, the focal length. That is, the image plane movement coefficient K changes according to the lens position of the focus lens 33 in the optical axis direction, and further according to the lens position of the zoom lens 32 in the optical axis direction. In the present embodiment, the lens control unit. The reference numeral 37 stores the image plane movement coefficient K for each lens position of the focus lens 33 and each lens position of the zoom lens 32.
The image plane movement coefficient K can be defined as, for example, image plane movement coefficient K=(image plane movement amount/focus lens 33 drive amount). In this case, the larger the image plane movement coefficient K, the larger the amount of movement of the image plane accompanying the driving of the focus lens 33.

Here, FIG. 3 shows a table showing the relationship between the lens position (focal length) of the zoom lens 32 and the lens position (shooting distance) of the focus lens 33, and the image plane movement coefficient K. Figure 3
In the table shown in (1), the drive area of the zoom lens 32 is divided into nine areas “f1” to “f9” in order from the wide end to the tele end, and the drive area of the focus lens 33 is changed from the closest end. The image plane movement coefficient K corresponding to each lens position is stored in order from the infinity end to nine areas “D1” to “D9”. For example, the lens position (focal length) of the zoom lens 32 is “f1”, and the lens position of the focus lens 33 (
When the shooting distance) is “D1”, the image plane movement coefficient K is “K11”. Note that the table shown in FIG. 3 exemplifies a mode in which the drive region of each lens is divided into nine regions, but the number is not particularly limited and can be set arbitrarily.

Next, the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max will be described with reference to FIG.
The minimum image plane movement coefficient K _min is a value corresponding to the minimum value of the image plane movement coefficient K. For example,
In FIG. 3, “K11”=“100”, “K12”=“200”, “K13”=“30”.
0”, “K14”=“400”, “K15”=“500”, “K16”=“600”, “
When K17”=“700”, “K18”=“800”, and “K19”=“900”, the minimum value “K11”=“100” is the minimum image plane movement coefficient K _min , The maximum value “K19”=“900” is the maximum image plane movement coefficient K _max .
The minimum image plane movement coefficient K _min normally changes according to the current lens position of the zoom lens 32. The minimum image plane movement coefficient K _min is usually a fixed value (fixed value) even if the current lens position of the focus lens 33 changes, unless the current lens position of the zoom lens 32 changes. That is, the minimum image plane movement coefficient K _min is usually the lens position of the zoom lens 32 (
It is a fixed value (constant value) determined according to the focal length, and is a value that does not depend on the lens position (shooting distance) of the focus lens 33.

For example, in FIG. 3, “K11”, “K21”, “K31”, and “K4” shown in gray.
1”, “K52”, “K62”, “K72”, “K82”, and “K91” are the minimum values of the image plane movement coefficient K at each lens position (focal length) of the zoom lens 32. It is the minimum image plane movement coefficient K _min shown. That is, the lens position (focal length) of the zoom lens 32
Is “f1”, the image plane movement coefficient K “K11” of “D1” to “D9” when the lens position (shooting distance) of the focus lens 33 is “D1” is The minimum image plane movement coefficient K _min indicating the minimum value is obtained. Therefore, “K11”, which is the image plane movement coefficient K when the lens position (shooting distance) of the focus lens 33 is “D1”, the lens position (shooting distance) of the focus lens 33 is “D1” to “D9”. The smallest value among the image plane movement coefficients K in the case of “K11” to “K19”. Similarly, even when the lens position (focal length) of the zoom lens 32 is “f2”, the focus lens 3
"K21", which is the image plane movement coefficient K when the lens position (shooting distance) of 3 is "D1", is "K21" which is the image plane movement coefficient K when "D1" to "D9". It is the smallest value among “K29”. That is, “K21” becomes the minimum image plane movement coefficient K _min . Hereinafter, similarly, each lens position (focal length) of the zoom lens 32 is “f3” to “f9”.
Even if the color is “K31”, “K41”, “K52”, “K62”, or “K” shown in gray.
72”, “K82”, and “K91” become the minimum image plane movement coefficient K _min , respectively.

Similarly, the maximum image plane movement coefficient K _max is a value corresponding to the maximum value of the image plane movement coefficient K.
The maximum image plane movement coefficient K _max normally changes according to the current lens position of the zoom lens 32. Further, the maximum image plane movement coefficient K _max is usually a constant value (fixed value) even if the current lens position of the focus lens 33 changes unless the current lens position of the zoom lens 32 changes. For example, in FIG. 3, "K19", "K29", "
"K39", "K49", "K59", "K69", "K79", "K89", "K99"
Is the maximum image plane movement coefficient K _max showing the maximum value among the image plane movement coefficients K at each lens position (focal length) of the zoom lens 32.

Thus, as shown in FIG. 3, the lens memory 38 stores the image plane movement coefficient K corresponding to the lens position (focal length) of the zoom lens 32 and the lens position (shooting distance) of the focus lens 33, and the zoom lens. For each lens position (focal length) of 32, the minimum image plane movement coefficient K _min showing the minimum value among the image plane movement coefficients K, and for each lens position (focal length) of the zoom lens 32, the image plane movement coefficient K _min. The maximum image plane movement coefficient K _max indicating the maximum value of K is stored.

In addition, the lens memory 38 uses the minimum image plane movement coefficient K that is a value in the vicinity of the minimum image plane movement coefficient K _min instead of the minimum image plane movement coefficient K _min that shows the smallest value among the image plane movement coefficients K. _min '
May be stored in the lens memory 38. For example, the value of the minimum image plane movement coefficient K _min is 1
If the number has a large digit number of 02.345, it is 1 which is a value near 102.345.
00 can be stored as the minimum image plane movement coefficient K _min ′. 10 in the lens memory 38
When 0 (minimum image plane movement coefficient K _min ') is stored, 102.345 (in the lens memory 38
This is because the storage capacity of the memory can be saved and the capacity of transmission data at the time of transmission to the camera body 2 can be suppressed as compared with the case of storing the minimum image plane movement coefficient K _min ).
Further, for example, when the value of the minimum image plane movement coefficient K _min is 100, 100 is taken into consideration in consideration of stability of control such as backlash reduction control, silent control (clip operation), and lens speed control, which will be described later. A value near 98 of 98 can be stored as the minimum image plane movement coefficient K _min '. For example, in consideration of control stability, the actual value (minimum image plane movement coefficient K _min
It is preferred that 80% to 120% of the) setting the minimum image plane shift factor K _min '.

In addition, in the present embodiment, the lens memory 38 stores the minimum image plane movement coefficient K described above.
_{In addition to min} and the maximum image plane movement coefficient K _max , the corrected minimum image plane movement coefficient K _{min_x} and the corrected maximum image plane movement coefficient K _{max_x} obtained by correcting these coefficients are stored. In Figure 4,
The lens position (focal length) of the zoom lens 32, the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max , the corrected minimum image plane movement coefficient K _{min_x,} and the corrected maximum image plane movement coefficient K _ma.
The table which shows the relationship with _{x_x} is shown.

That is, as shown in FIG. 4, the lens position (focal length) of the zoom lens 32 is “f1”.
In the lens memory 38, in addition to “K11” as the minimum image plane movement coefficient K _min , “K11′” as the corrected minimum image plane movement coefficient K _{min — x} is stored. Similarly, in addition to “K91” as the maximum image plane movement coefficient K _max , “K91′” as the corrected maximum image plane movement coefficient K _{max — x} is stored. Similarly, even when the lens positions (focal lengths) of the zoom lens 32 are "f2" to "f9", as shown in FIG. 4, the correction minimum image plane movement coefficient K _{min_x} is "K21'. , "K31'", "K41'"
, "K52'", "K62'", "K72'", "K82'", "K91'" are stored, and "K29'" and "K39'" are stored as the corrected maximum image plane movement coefficient _{Kmax_x.} , "K49
"", "K59'", "K69'", "K79'", "K89'", and "K99'" are stored.

As the correction minimum image plane shift factor K _{min_x,} it may be a coefficient obtained by correcting the minimum image plane shift factor K _min, not particularly limited, a value larger than the minimum image plane shift factor K _min Any of these may be included or those having a value smaller than the minimum image plane movement coefficient K _min , and may be appropriately set according to the purpose and the like. For example, in the present embodiment, as will be described later, the minimum image plane movement coefficient K _min can be used to determine the scan drive speed V when performing the scan operation of the focus lens 33. However, on the other hand, when the minimum image plane movement coefficient K _min is used, depending on the position of the blur correction lens 34 and the posture of the camera 1, due to these influences, the appropriate scan drive speed V cannot be calculated. There is. Therefore, in this embodiment, the corrected minimum image plane movement coefficient K _{min —
As x} , it is desirable to adopt one that takes into consideration the influence of the position of the shake correction lens 34 and the attitude of the camera 1. However, it is not particularly limited to such an aspect. Further, in the above-described example, the configuration having only one corrected minimum image plane movement coefficient K _{min_x} is illustrated, but a configuration having a plurality of corrected minimum image plane movement coefficients K _{min_x} may be _adopted .

Further, if the coefficient obtained by correcting the maximum image plane shift factor K _max is the maximum correction image plane shift factor K _{max_x} well, not particularly limited, it has a value greater than the maximum image plane shift factor K _max Any of those having a value smaller than the maximum image plane movement coefficient K _max may be used, and may be appropriately set according to the purpose and the like. Further, in the above-mentioned example, the configuration having only one corrected maximum image plane movement coefficient K _{max_x} is illustrated, but a configuration having a plurality of corrected maximum image plane movement coefficients K _{max_x} may be _adopted .

Next, a method of communicating data between the camera body 2 and the lens barrel 3 will be described.

A body side mount portion 20 to which the lens barrel 3 is detachably attached to the camera body 2.
1 is provided. Further, as shown in FIG. 1, at a position near the body-side mount portion 201 (on the inner surface side of the body-side mount portion 201), a connecting portion 202 that protrudes toward the inner surface side of the body-side mount portion 201 is provided. .. The connecting portion 202 is provided with a plurality of electric contacts.

On the other hand, the lens barrel 3 is an interchangeable lens that is attachable to and detachable from the camera body 2, and the lens barrel 3 is provided with a lens side mount portion 301 that is detachably attached to the camera body 2. Further, as shown in FIG. 1, the vicinity of the lens side mount section 301 (lens side mount section 3
01 inner surface side), the connection portion 302 protruding to the inner surface side of the lens side mount portion 301
Is provided. The connecting portion 302 is provided with a plurality of electric contacts.

When the lens barrel 3 is attached to the camera body 2, the electrical contacts of the connecting portion 202 provided on the body side mount portion 201 and the connecting portion 30 provided on the lens side mount portion 301.
The two electrical contacts are electrically and physically connected. As a result, the connecting portions 202, 302
Power supply from the camera body 2 to the lens barrel 3 via the
Data communication with

A body side mount portion 20 to which the lens barrel 3 is detachably attached to the camera body 2.
1 is provided. Further, as shown in FIG. 1, at a position near the body-side mount portion 201 (on the inner surface side of the body-side mount portion 201), a connecting portion 202 that protrudes toward the inner surface side of the body-side mount portion 201 is provided. .. The connecting portion 202 is provided with a plurality of electric contacts.

On the other hand, the lens barrel 3 is an interchangeable lens that is attachable to and detachable from the camera body 2, and the lens barrel 3 is provided with a lens side mount portion 301 that is detachably attached to the camera body 2. Further, as shown in FIG. 1, the vicinity of the lens side mount section 301 (lens side mount section 3
01 inner surface side), the connection portion 302 protruding to the inner surface side of the lens side mount portion 301
Is provided. The connecting portion 302 is provided with a plurality of electric contacts.

When the lens barrel 3 is attached to the camera body 2, the electrical contacts of the connecting portion 202 provided on the body side mount portion 201 and the connecting portion 30 provided on the lens side mount portion 301.
The two electrical contacts are electrically and physically connected. As a result, the connecting portions 202, 302
Power supply from the camera body 2 to the lens barrel 3 via the
Data communication with

FIG. 5 is a schematic diagram showing the details of the connection units 202 and 302. In addition, in FIG.
02 is arranged on the right side of the body side mount portion 201 in accordance with the actual mount structure. That is, the connecting portion 202 of the present embodiment is arranged at a location deeper than the mounting surface of the body-side mount portion 201 (a location on the right side of the body-side mount portion 201 in FIG. 5). Similarly, the connection part 302 is arranged on the right side of the lens side mount part 301 because the connection part 302 of the present embodiment is arranged at a position protruding from the mount surface of the lens side mount part 301. It represents. By arranging the connection portion 202 and the connection portion 302 in this way, the mount surface of the body side mount portion 201 and the mount surface of the lens side mount portion 301 are brought into contact with each other, and the camera body 2 and the lens barrel 3 are connected. When the mounts are coupled to each other, the connecting portion 202 and the connecting portion 302 are connected to each other, whereby both connecting portions 2 are connected.
The electrical contacts provided at 02 and 302 are connected to each other.

As shown in FIG. 5, the connecting portion 202 has 12 electrical contacts BP1 to BP12. Further, in the connecting portion 302 on the lens 3 side, there are 12 electrical contacts LP1 to LP12 corresponding to the 12 electrical contacts on the camera body 2 side, respectively.

The electrical contacts BP1 and BP2 are connected to the first power supply circuit 230 in the camera body 2. The first power supply circuit 230 applies an operating voltage to each part in the lens barrel 3 (excluding circuits with relatively large power consumption such as the lens drive motors 321 and 331) via the electrical contacts BP1 and the electrical contacts LP1. Supply. The voltage value supplied by the first power supply circuit 230 via the electrical contact BP1 and the electrical contact LP1 is not particularly limited and is, for example, 3 to 4V.
Value (typically, a voltage value in the vicinity of 3.5 V which is in the middle of this voltage width). In this case, the current value supplied from the camera body side 2 to the lens barrel side 3 is within the range of about several tens mA to several hundreds mA in the power-on state. Also, the electrical contacts BP
2 and the electric contact LP2 are ground terminals corresponding to the above-mentioned operating voltage supplied via the electric contact BP1 and the electric contact LP1.

The electrical contacts BP3 to BP6 are connected to the camera-side first communication unit 291. The electrical contacts LP3 to LP6 correspond to the electrical contacts BP3 to BP6 and the lens-side first communication unit 381.
It is connected to the. Then, the camera-side first communication unit 291 and the lens-side first communication unit 381 mutually transmit and receive signals using these electrical contacts. The camera-side first communication unit 29
The contents of the communication between the first lens unit 1 and the lens-side first communication unit 381 will be described in detail later.

The electrical contacts BP7 to BP10 are connected to the camera side second communication unit 292, and the electrical contacts LP7 to LP10 are connected to the lens side second communication unit 382 corresponding to these electrical contacts BP7 to BP10. .. Then, the camera side second communication unit 292 and the lens side second communication unit 38.
2 transmits and receives signals to and from each other using these electrical contacts. The contents of the communication performed by the second camera side communication unit 292 and the second lens side communication unit 382 will be described in detail later.

The electrical contacts BP11 and BP12 are connected to the second power supply circuit 240 in the camera body 2. The second power supply circuit 240 supplies an operating voltage to circuits such as the lens drive motors 321 and 331 that consume relatively large power, via the electrical contacts BP11 and the electrical contacts LP11. The voltage value supplied by the second power supply circuit 230 is not particularly limited, but the maximum value of the voltage value supplied by the second power supply circuit 240 is the number of the maximum values of the voltage value supplied by the first power supply circuit 230. It can be doubled. Further, in this case, the current value supplied from the second power supply circuit 240 to the lens barrel 3 side is a current value within the range of about several tens mA to several A in the power-on state. In addition, the electrical contact point BP12 and the electrical contact point LP12 are
It is a ground terminal corresponding to the operating voltage supplied via P11 and the electrical contact LP11.

The first communication unit 291 and the second communication unit 292 on the camera body 2 side shown in FIG.
5, and the first communication unit 381 and the second communication unit 382 on the lens barrel 3 side shown in FIG. 5 form the lens transmission/reception unit 38 shown in FIG.

Next, communication between the camera-side first communication unit 291 and the lens-side first communication unit 381 (hereinafter referred to as command data communication) will be described. The lens control unit 37 includes the electrical contacts BP3 and L.
A signal line CLK composed of P3, a signal line BDAT composed of electrical contacts BP4 and LP4, a signal line LDAT composed of electrical contacts BP5 and LP5, and an electrical contact B.
Transmission of control data from the camera-side first communication unit 291 to the lens-side first communication unit 381 via the signal line RDY composed of P6 and LP6, and the lens-side first communication unit 381 to the camera-side first In parallel with the transmission of the response data to the communication unit 291, a predetermined cycle (for example,
Command data communication is performed at 16 millisecond intervals.

FIG. 6 is a timing chart showing an example of command data communication. Camera control unit 2
1 and the camera-side first communication unit 291 first, at the start of command data communication (T1),
Check the signal level of the signal line RDY. Here, the signal level of the signal line RDY indicates whether or not the lens-side first communication unit 381 can communicate. The level signal is output. The camera-side first communication unit 291 does not perform communication with the lens barrel 3 when the signal line RDY is at the H level, or does not perform the next process even during communication.

On the other hand, when the signal line RDY is at the L (LOW) level, the camera control unit 21 and the camera-side first communication unit 291 use the signal line CLK to transmit the clock signal 401 to the lens-side first communication unit 291. .. Further, the camera control unit 21 and the camera-side first communication unit 291 use the signal line BDAT in synchronization with the clock signal 401 to send the camera-side command packet signal 402, which is control data, to the lens-side first communication unit 291. Send to. When the clock signal 401 is output, the lens controller 37 and the first lens-side communication unit 381 synchronize with the clock signal 401 and use the signal line LDAT to transmit the lens-side command packet signal, which is response data. 403 is transmitted.

The lens controller 37 and the first lens side communication unit 291 change the signal level of the signal line RDY from the L level to the H level in response to the completion of the transmission of the lens side command packet signal 403 (T2). Then, the lens control unit 37 starts the first control processing 404 according to the content of the body side command packet signal 402 received by time T2.

For example, when the received body side command packet signal 402 has a content requesting specific data on the lens barrel 3 side, the lens control unit 37 performs the first control processing 404 as follows.
The content of the command packet signal 402 is analyzed, and the process of generating the requested specific data is executed. Furthermore, the lens control unit 37 uses the checksum data included in the command packet signal 402 as the first control processing 404 to easily determine whether or not there is an error in the communication of the command packet signal 402 from the number of data bytes. It also executes the communication error check process to check dynamically. The signal of the specific data generated in the first control processing 404 is output to the camera body 2 side as a lens side data packet signal 407 (T3). In this case, the camera side data packet signal 406 output from the camera body 2 side after the command packet signal 402 is dummy data (including checksum data) that does not make any special sense to the lens side. .. In this case, the lens control unit 37 executes the communication error check processing as described above using the checksum data included in the camera side data packet signal 406 as the second control processing 408 (T4).

In addition, for example, when the camera side command packet signal 402 is the drive instruction of the focus lens 33 and the camera side data packet signal 406 is the drive speed and drive amount of the focus lens 33, the lens control unit 37 determines the first As the control processing 404, the contents of the command packet signal 402 are analyzed and a confirmation signal indicating that the contents are understood is generated (T2). The confirmation signal generated in the first control processing 404 is output to the camera body 2 as the lens side data packet signal 407 (T3). Further, the lens control unit 37
As the second control processing 408, the content of the camera-side data packet signal 406 is analyzed, and the communication error check processing is executed using the checksum data included in the camera-side data packet signal 406 (T4). Then, after the completion of the second control processing 408, the lens control unit 37 drives the focus lens drive motor 331 based on the received camera-side command packet signal 406, that is, the drive speed and drive amount of the focus lens 33. Then, the focus lens 33 is driven at the received drive speed by the received drive amount (T5).

In addition, when the second control processing 408 is completed, the lens control unit 37, the lens side first communication unit 2
91 is notified of the completion of the second control processing 408. As a result, the lens controller 37 outputs an L level signal to the signal line RDY (T5).

The communication performed between the times T1 and T5 described above is one command data communication.
As described above, in one command data communication, the camera control unit 21 and the camera-side first communication unit 291 transmit one camera-side command packet signal 402 and one camera-side data packet signal 406, respectively. Thus, in this embodiment, the camera body 2
The control data transmitted from the lens barrel 3 to the lens barrel 3 is divided into two for the convenience of processing, but is transmitted by the camera side command packet signal 402 and the camera side data packet signal 406.
Is a combination of the two to form one control data.

Similarly, in one command data communication, the lens controller 37 and the first lens-side communication unit 381 cause the lens-side command packet signal 403 and the lens-side data packet signal 4 to be transmitted.
07 are transmitted one by one. As described above, the response data transmitted from the lens barrel 3 to the camera body 2 is also divided into two, but the lens-side command packet signal 403 and the lens-side data packet signal 407 are also combined into one response data. Make up.

Next, communication between the camera-side second communication unit 292 and the lens-side second communication unit 382 (hereinafter referred to as hotline communication) will be described. Returning to FIG. 5, the lens controller 37 determines that the electrical contact point BP
7 and LP7, a signal line HANS including electrical contacts BP8 and LP8, a signal line HCLK including electrical contacts BP9 and LP9, and a signal line HDAT including electrical contacts BP10 and LP10. The hotline communication is performed via the command data communication at a shorter cycle (for example, at 1 millisecond intervals).

For example, in this embodiment, the lens information of the lens barrel 3 is changed by hotline communication.
It is transmitted from the lens barrel 3 to the camera body 2. The lens information transmitted by hotline communication includes the lens position of the focus lens 33, the lens position of the zoom lens 32, and
The current position image plane movement coefficient K _cur , the minimum image plane movement coefficient K _min , and the maximum image plane movement coefficient K _max are included. Here, the current position image plane movement coefficient K _cur is an image plane movement coefficient K corresponding to the current lens position (focal length) of the zoom lens 32 and the current lens position (shooting distance) of the focus lens 33. In the present embodiment, the lens controller 37 uses the lens memory 38.
The current lens position of the zoom lens 32 and the current lens of the focus lens 33 are referred to by referring to the table stored in the table showing the relationship between the lens position (zoom lens position and focus lens position) and the image plane movement coefficient K. Current position image plane movement coefficient K _cur corresponding to the position
Can be asked. For example, in the example shown in FIG. 3, the lens position (focal length) of the zoom lens 32 is “f1”, and the lens position (shooting distance) of the focus lens 33 is “f.
In the case of "D4", the lens control unit 37 uses hotline communication to set "K14" as the current position image plane movement coefficient K _cur , "K11" as the minimum image plane movement coefficient K _min , and the maximum image plane movement coefficient K _min. “K19” is transmitted to the camera control unit 21 as _max . Further, in the present embodiment, as will be described later, instead of the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max as lens information, the above-described corrected minimum image plane movement coefficient K _{min_x} and correction are performed. The maximum image plane movement coefficient K _{max — x} may be included.

Here, FIG. 7 is a timing chart showing an example of hotline communication. FIG. 7(a
10] FIG. 10 is a diagram illustrating a state in which hotline communication is repeatedly executed every predetermined period Tn. Further, FIG. 7B shows a state in which the period Tx of a certain one communication among the repeatedly executed hotline communication is expanded. Hereinafter, a scene in which the lens position of the focus lens 33 is communicated by hotline communication will be described based on the timing chart of FIG.

The camera control unit 21 and the second camera-side communication unit 292 first output an L level signal to the signal line HREQ in order to start communication by hot line communication (T6). And
The lens side second communication unit 382 notifies the lens control unit 37 that this signal has been input to the electrical contact LP7. In response to this notification, the lens controller 37 starts execution of the generation process 501 that generates lens position data. The generation process 501 is a process in which the lens control unit 37 causes the focus lens encoder 332 to detect the position of the focus lens 33, and generates lens position data representing the detection result.

When the lens control unit 37 completes the execution of the generation process 501, the lens control unit 37 and the second lens side communication unit 382 output an L level signal to the signal line HANS (T7). Then, when this signal is input to the electrical contact BP8, the camera control unit 21 and the second camera-side communication unit 292 output the clock signal 502 from the electrical contact BP9 to the signal line HCLK.

The lens controller 37 and the second lens-side communication unit 382 output a lens position data signal 503 representing lens position data from the electrical contact LP10 to the signal line HDAT in synchronization with the clock signal 502. Then, when the transmission of the lens position data signal 503 is completed, the lens controller 37 and the second lens side communication unit 382 output an H level signal from the electrical contact LP8 to the signal line HANS (T8). Then, when this signal is input to the electrical contact BP8, the second camera side communication unit 292 outputs an H level signal from the electrical contact LP7 to the signal line HREQ (T9).

The command data communication and the hotline communication can be executed simultaneously or in parallel.

Next, an operation example of the camera 1 according to the present embodiment will be described with reference to FIG. FIG. 8 is a flowchart showing the operation of the camera 1 according to this embodiment. The following operation is started when the power of the camera 1 is turned on.

First, in step S101, the camera body 2 performs communication for identifying the lens barrel 3. This is because the communicable communication format differs depending on the type of lens barrel. Then, in step S102, the camera control unit 21 determines that the lens barrel 3
It is determined whether or not is a lens corresponding to a predetermined first type communication format. As a result, when it is determined that the lens is compatible with the first type of communication format, the process proceeds to step S103.
On the other hand, when the camera control unit 21 determines that the lens barrel 3 is a lens that does not support the predetermined first type communication format, the process proceeds to step S112. In addition, the camera control unit 21
If it is determined that the lens barrel 3 is a lens compatible with the second type communication format different from the first type communication format, the process may proceed to step S112. Furthermore, if the camera control unit 21 determines that the lens barrel 3 is a lens compatible with the communication types of the first type and the second type, the process may proceed to step S103.

Next, in step S103, it is determined whether or not the live view shooting on/off switch provided on the operation unit 28 is turned on by the photographer, and when the live view shooting is turned on, the mirror system 220 is turned on. Is the shooting position of the subject, and the light flux from the subject is guided to the image sensor 22.

In step S104, hotline communication is started between the camera body 2 and the lens barrel 3. In the hot line communication, as described above, the L level signal (request signal) output to the signal line HREQ by the camera control unit 21 and the camera side second communication unit 292.
Is received by the lens control unit 37, the lens information is transmitted to the camera control unit 21, and such lens information is repeatedly transmitted. The lens information includes, for example, the lens position of the focus lens 33, the lens position of the zoom lens 32, the current position image plane movement coefficient K _cur.
, Minimum image plane movement coefficient K _min , and maximum image plane movement coefficient K _max . The hotline communication is repeatedly performed after step S104. Hotline communication, for example,
This is repeated until the power switch is turned off.
Further, the lens control unit 37 uses the corrected minimum image plane movement coefficient K _{min_x} and the corrected maximum image plane movement coefficient K _{max_x} instead of the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max. 21 may be transmitted.

Here, in the present embodiment, the lens control unit 37 sends the lens information to the camera control unit 21.
When transmitting the zoom lens 32, the current lens position of the zoom lens 32 and the focus lens The current position image plane movement coefficient K _cur corresponding to the current lens position of 33, and the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max corresponding to the current lens position of the zoom lens 32 are acquired. , The acquired current position image plane movement coefficient K _cur , the minimum image plane movement coefficient K _min , and the maximum image plane movement coefficient K _max are transmitted to the camera control unit 21.

Further, in the present embodiment, when the minimum image plane movement coefficient K _min is transmitted to the camera control unit 21 by hotline communication, the minimum image plane movement coefficient K _min and the corrected minimum image plane movement coefficient K _{min_x} are set. Send alternately. That is, in the present embodiment, the minimum image plane movement coefficient K _min is transmitted in the first processing period, and then the corrected minimum image plane movement coefficient K _min is transmitted in the second processing period following the first processing period. _{Send min_x} . Then, in the third processing period following the second processing period, the minimum image plane movement coefficient K _min is transmitted again, and thereafter, the corrected minimum image plane movement coefficient K _{min_x} and the minimum image plane movement coefficient K _min are alternated. Send to.

The lens control unit 37 determines, for example, that the lens position (focal length) of the zoom lens 32 is “f1.
, “K11” as the corrected minimum image plane movement coefficient K _{min — x} and “K11′” as the minimum image plane movement coefficient K _min are alternated, that is, “K11” and “K11′”. , ``
"K11", "K11'", and so on are transmitted in this order. However, in this case, when the zoom lens 32 is driven and the lens position (focal length) of the zoom lens 32 changes, for example, when the lens position (focal length) of the zoom lens 32 is set to “f2”. Has
After that, "K21" and "K21'" corresponding to "f2" will be transmitted alternately, but "K11" is obtained when the lens position (focal length) of the zoom lens 32 does not change.
And “K11′” are continuously transmitted alternately.

Similarly, when transmitting the maximum image plane movement coefficient K _max to the camera control section 21, the lens control unit 37 alternately alternates the maximum image plane movement coefficient K _max and the corrected maximum image plane movement coefficient K _{max_x.} Send to.

In step S105, it is determined whether or not the photographer has performed a half-press operation of the release button provided on the operation unit 28 (turning on the first switch SW1) or an AF start operation. When it is performed, the process proceeds to step S106 (in the following, a case where a half-press operation is performed will be described in detail).

Next, in step S106, the camera control unit 21 transmits a scan drive command (scan drive start instruction) to the lens control unit 37 in order to perform focus detection by the contrast detection method. The scan drive command (instruction of drive speed during scan drive or drive position) for the lens controller 37 may be given at the drive speed of the focus lens 33 or at the image plane moving speed. , The target drive position may be given.

Then, in step S107, the camera control unit 21 scans the driving speed of the focus lens 33 in the scanning operation based on the minimum image plane movement coefficient K _min or the corrected minimum image plane movement coefficient K _{min_x} acquired in step S104. The process of determining the driving speed V is performed.
In the following, first, of the minimum image plane shift factor K _min and corrected minimum image plane shift factor K _{min_x,} using the minimum image plane shift factor K _min, exemplified by describing the case of determining the scan driving speed V To do.

In the present embodiment, the scan operation is performed by the focus lens drive motor 331.
While driving the focus lens 33 at the scan driving speed V determined in step S107, the camera control unit 21 calculates the focus evaluation value by the contrast detection method.
Performed at the same time at a predetermined interval, which allows the focus position to be detected by the contrast detection method.
It is an operation executed at a predetermined interval.

Further, in this scan operation, when detecting the in-focus position by the contrast detection method, the camera control unit 21 scan-drives the focus lens 33 and calculates the focus evaluation value at a predetermined sampling interval, The lens position where the calculated focus evaluation value reaches a peak is detected as the in-focus position. Specifically, the camera control unit 21 controls the focus lens 3
By driving 3 for scanning, the image plane of the optical system is moved in the optical axis direction.
Focus evaluation values are calculated on different image planes, and the lens position where these focus evaluation values reach a peak is detected as the focus position. However, on the other hand, if the moving speed of the image plane is too fast, the distance between the image planes for calculating the focus evaluation value becomes too large, and it may not be possible to properly detect the in-focus position. .. In particular, the image plane movement coefficient K, which indicates the amount of movement of the image plane with respect to the drive amount of the focus lens 33, changes according to the lens position of the focus lens 33 in the optical axis direction. Even if the focus lens 33 is driven by, the moving speed of the image plane becomes too fast depending on the lens position of the focus lens 33. Therefore, the distance between the image planes for calculating the focus evaluation value becomes too large, and the focus position is changed. It may not be able to be detected properly.

Therefore, in the present embodiment, the camera control unit 21 calculates the scan drive speed V when performing scan drive of the focus lens 33 based on the minimum image plane movement coefficient K _min acquired in step S104. The camera control unit 21 uses a minimum image plane movement coefficient K _min to perform a scan so that the focus position can be appropriately detected by the contrast detection method and the maximum drive speed is achieved. The driving speed V is calculated.

On the other hand, in the present embodiment, for example, depending on the position of the blur correction lens 34 and the attitude of the camera 1, if the scan driving speed V is determined based on the minimum image plane movement coefficient K _min , the appropriate scan driving is not necessarily performed. In some cases, the velocity V cannot be calculated. Therefore, in such a case, the corrected minimum image plane movement coefficient K _{min — x} is used instead of the minimum image plane movement coefficient K _min .
The scan drive speed V will be determined. In particular, depending on the position of the shake correction lens 34, the optical path length until the light that has entered the lens barrel 3 reaches the image pickup element 22 changes as compared with the case where the shake correction lens 34 is at the center position. In such a case, an optical error may occur. Alternatively, depending on the posture of the camera 1, (
In particular, when the camera 1 is directed in the vertically upward direction or the vertically downward direction), the mechanical positions of the lenses 31, 32, 33, 34, and 35 are slightly shifted due to their own weight. In some cases, this may cause an optical error. In particular, when the lens structure of the lens barrel or the lens barrel is large, such a phenomenon may occur. Therefore, in the present embodiment, when such a scene is detected, the scan drive speed V is determined using the corrected minimum image plane movement coefficient K _{min_x} instead of the minimum image plane movement coefficient K _min. I will.

Note that, for example, in the case of determining whether to use the corrected minimum image plane movement coefficient K _{min_x} instead of the minimum image plane movement coefficient K _min according to the position of the shake correction lens 34, the shake correction lens 34 Position data is acquired from the lens control unit 37, and based on the acquired data, when the drive amount of the shake correction lens 34 is equal to or larger than a predetermined amount, it may be determined that the corrected minimum image plane movement coefficient K _{min_x} is used. it can. Alternatively, depending on the posture of the camera 1, the minimum image plane movement coefficient K _mi
When determining whether or not to use the corrected minimum image plane movement coefficient K _{min — x} instead of _n , the output of a posture sensor (not shown) is acquired, and the orientation of the camera 1 is set horizontally based on the acquired sensor output. When the angle is equal to or _larger than the predetermined angle with respect to the direction, it can be determined to use the corrected minimum image plane movement coefficient K _{min — x} . Furthermore, based on both the position data of the blur correction lens 34 and the output of the attitude sensor, it is determined whether or not the corrected minimum image plane movement coefficient K _{min_x} is used instead of the minimum image plane movement coefficient K _min. Good.

Then, in step S108, at the scan drive speed V determined in step S107,
The scan operation starts. Specifically, the camera control unit 21 sends a scan drive start command to the lens control unit 37, and the lens control unit 37 drives the focus lens drive motor 331 based on the command from the camera control unit 21 to focus the lens. Lens 33, step S
Scan drive is performed at the scan drive speed V determined in 107. Then, the camera control unit 21
Reads the pixel output from the image pickup pixel of the image pickup device 22 at a predetermined interval while driving the focus lens 33 at the scan drive speed V, and calculates the focus evaluation value based on this.
Thus, the focus evaluation values at different focus lens positions are acquired to detect the in-focus position by the contrast detection method.

Next, in step S109, the camera control unit 21 determines whether or not the peak value of the focus evaluation value has been detected (whether or not the focus position has been detected). When the peak value of the focus evaluation value cannot be detected, the process returns to step S108, and steps S108 and S1 are performed until the peak value of the focus evaluation value can be detected or the focus lens 33 is driven to a predetermined driving end.
The operation of 09 is repeated. On the other hand, if the peak focus evaluation value can be detected, step S
Proceed to 109.

When the peak value of the focus evaluation value can be detected, the process proceeds to step S110 and step S110.
Then, the camera control unit 21 transmits to the lens control unit 37 a command for driving the focus to a position corresponding to the peak value of the focus evaluation value. The lens control unit 37 controls the drive of the focus lens 33 according to the received command.

Next, in step S111, the camera control unit 21 determines that the focus lens 33 has reached the position corresponding to the peak value of the focus evaluation value, and the photographer fully presses the shutter release button (step S111). When the second switch SW2 is turned on), still image shooting control is performed. After the shooting control ends, the process returns to step S104 again.

On the other hand, when it is determined in step S102 that the lens barrel 3 is a lens that does not support the predetermined first type communication format, the process proceeds to step S112 and step S11.
The processing of 2 to S120 is executed. In steps S112 to S120, when the lens information is repeatedly transmitted by hotline communication between the camera body 2 and the lens barrel 3, the minimum image plane movement coefficient K _min and the lens information are used as the lens information. A point at which information that does not include information about the maximum image plane movement coefficient K _max is transmitted (step S113), and the scan driving speed V that is the driving speed of the focus lens 33 in the scanning operation.
When determining, instead of the minimum image plane movement coefficient K _min or the corrected minimum image plane movement coefficient K _{min — x} ,
Except for the point of using the current position image plane movement coefficient K _cur included in the lens information (step S116), the same processing as steps S103 to S111 described above is executed.

As described above, in the present embodiment, in the lens memory 38 of the lens barrel 3, the minimum image plane movement coefficient K _min which is the minimum image plane movement coefficient and the maximum image plane movement coefficient K which is the maximum image plane movement coefficient are stored. _m
By storing _ax and using the minimum image plane movement coefficient K _min among the image plane movement coefficients K stored in the lens memory 38, the focus position can be appropriately detected by the contrast detection method. Since the scan drive speed V is calculated so as to be the drive speed and the maximum drive speed, the image plane movement coefficient K is the minimum value (for example, the same value as the minimum image plane movement coefficient K _min ).
Even when the focus lens 33 is scan-driven to a position such that, the focus evaluation value calculation interval (image surface interval for calculating the focus evaluation value) can be set to a size suitable for focus detection. Then, according to this embodiment, when the focus lens 33 is driven in the optical axis direction, the image plane movement coefficient K changes, and as a result, the image plane movement coefficient K becomes small ( For example, even when the minimum image plane movement coefficient K _min is reached), the focus position can be properly detected by the contrast detection method.

In addition, according to the present embodiment, in addition to the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max , the correction minimum image plane movement coefficient K _{min_x} and the correction maximum are stored in the lens memory 38 of the lens barrel 3. The image plane movement coefficient K _{max — x} is stored and stored in a predetermined scene (for example, the shake correction lens 3).
4 is in a predetermined position, or the posture of the camera 1 is in a predetermined state), the corrected minimum image plane movement coefficient K _{min_x} is used in place of the minimum image plane movement coefficient K _min. Since V is calculated, the scan drive speed V can be determined with higher accuracy, and thus the focus position can be detected more appropriately by the contrast detection method.

<<Second Embodiment>>
Next, a second embodiment of the present invention will be described. In the second embodiment, in the camera 1 shown in FIG. 1, the minimum image plane shift factor is stored in the lens memory 38 of the lens barrel 3 K _min and maximum image plane shift factor K _max, depending on the lens position of the focus lens 33 And has the same configuration as that of the above-described first embodiment, operates in the same manner, and
It has the same effect.

As described above, in the camera 1 according to the present embodiment, depending on the position of the shake correction lens 34, the light incident on the lens barrel 3 may be different from that in the case where the shake correction lens 34 is at the center position. The optical path length until reaching 22 changes, but such a tendency differs depending on the lens position of the focus lens 33. That is, even if the position of the shake correction lens 34 is the same, the degree of change in the optical path length is different depending on the lens position of the focus lens 33 when the shake correction lens 34 is at the center position. Will end up. On the other hand, in the second embodiment, the minimum image plane movement coefficient K
_It is assumed that _min and the maximum image plane movement coefficient K _max are changed in accordance with the lens position of the focus lens 33, and in step S107 shown in FIG. The scan drive speed V is determined by using the minimum image plane movement coefficient K _min according to the lens position of the focus lens 33. Then, by this, the scan drive speed V can be calculated more appropriately.

In the second embodiment, as the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max according to the lens position of the focus lens 33, for example, as in the table shown in FIG. It can be obtained by using a table showing the relationship between the lens position (focal length) and the lens position (shooting distance) of the focus lens 33, and the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max . Alternatively, by _{obtaining the} current position image plane movement coefficient K _cur using the table shown in FIG. 3 and multiplying the current position image plane movement coefficient K _cur by a predetermined constant, or by adding or subtracting a predetermined constant, It is also possible to obtain the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max according to the lens position of the focus lens 33.

<<Third Embodiment>>
Next, a third embodiment of the invention will be described. In the third embodiment, the camera 1 shown in FIG. 1 has the same configuration as the above-described first embodiment except that the camera 1 operates as described below.

That is, in the third embodiment, in the flow chart shown in FIG. 8 in the above-described first embodiment, when the in-focus position can be detected by the contrast detection method in step S109, the contrast detection method is changed in step S110. When performing focus drive based on the result, it is determined whether or not backlash drive is to be performed, and based on the determination, the drive form of the focus lens 33 at the time of focus drive is changed. This point is the same as this point except that it is different from the first embodiment.

That is, the focus lens drive motor 331 for driving the focus lens 33 shown in FIG. 1 is usually composed of a mechanical drive transmission mechanism, and such a drive transmission mechanism is
For example, as shown in FIG. 9, it is composed of a first drive mechanism 500 and a second drive mechanism 600. When the first drive mechanism 500 is driven, the second drive on the side of the focus lens 33 is accompanied by this. The mechanism 600 is driven so that the focus lens 33 is moved to the near side or the infinity side. In such a drive mechanism, the play amount G is usually provided from the viewpoint of smooth operation of the gear meshing portion.
However, on the other hand, in the contrast detection method, due to its mechanism, FIG.
As shown in 0 (B), the focus lens 33 needs to be driven to the in-focus position by reversing the driving direction after passing the in-focus position once by the scanning operation. And
In this case, there is a characteristic that the lens position of the focus lens 33 deviates from the in-focus position by the amount of backlash G when the backlash reduction drive is not performed as shown in FIG. 10B. Therefore, in order to remove the influence of such play G, as shown in FIG. 10(A), when the focus lens 33 is driven to focus, the focus lens 33 once passes through the focus position and then again. , It becomes necessary to perform the backlash reduction drive for reversing the drive direction and driving to the in-focus position.

Note that FIG. 10 shows the relationship between the focus lens position and the focus evaluation value, and the relationship between the focus lens position and time when the focusing operation based on the scan operation and the contrast detection method according to the present embodiment is performed. It is a figure. Then, in FIG. 10A, at time t ₀ , after the scan operation of the focus lens 33 is started from the lens position P 0 from the infinity side to the close side, the focus lens 33 moves to the lens position at time t ₁ . When the peak position (focus position) P2 of the focus evaluation value is detected at the time of moving to P1, the scanning operation is stopped, and the focus drive accompanied by the backlash drive is performed, so that at time t ₂ . , A mode in which the focus lens 33 is driven to the in-focus position. On the other hand, similarly, in FIG. 10B, after the scan operation is started at time t ₀ , the scan operation is stopped at time t ₁ , and the focus drive is performed without the backlash reduction drive. A mode in which the focus lens 33 is driven to the in-focus position at time t ₃ is shown.

Below, an operation example in the third embodiment will be described in accordance with the flowchart shown in FIG.
explain. Note that the following operation is executed when the in-focus position is detected by the contrast detection method in step S109 in the flowchart shown in FIG. 8 described above. That is, as shown in FIGS. 10A and 10B, the focus evaluation value is obtained when the scan operation is started at time t ₀ and the focus lens 33 is moved to the lens position P1 at time t ₁ . When the peak position (focus position) P2 of is detected, it is executed at time t ₁ .

That is, when the in-focus position is detected by the contrast detection method, first, step S2
At 01, the camera control unit 21 acquires the minimum image plane movement coefficient K _min at the current lens position of the zoom lens 32. It should be noted that the minimum image plane movement coefficient K _min is the lens control via the lens transmission/reception unit 39 and the camera transmission/reception unit 21 by the hotline communication performed between the camera control unit 21 and the lens control unit 37 described above. It can be obtained from the section 37.

Next, in step S202, the camera control unit 21 acquires information about the amount of play G (see FIG. 9) of the drive transmission mechanism of the focus lens 33. The focus lens 3
The play amount G of the drive transmission mechanism 3 is, for example, the lens memory 38 provided in the lens barrel 3.
It can be acquired by referencing this stored in advance. That is, specifically, the camera control unit 21 sends a transmission request for the play amount G of the drive transmission mechanism of the focus lens 33 to the lens control unit 37 via the camera transmission/reception unit 29 and the lens transmission/reception unit 38. Then, the lens control unit 37 causes the focus lens 3 stored in the lens memory 38.
The amount of backlash G of the drive transmission mechanism of No. 3 can be acquired by transmitting. Alternatively, the amount of backlash G of the drive transmission mechanism of the focus lens 33 stored in the lens memory 38 is included in the lens information transmitted and received by the hotline communication performed between the camera control unit 21 and the lens control unit 37 described above. It may be configured to include information.

Next, in step S203, the camera control unit 21 causes the above-described step S201.
An image plane movement amount I _G corresponding to the backlash amount _G is calculated based on the minimum image plane movement coefficient K _min acquired in step S1 and the information on the backlash amount G of the drive transmission mechanism of the focus lens 33 acquired in step S202 described above. To do. The image plane movement amount I _G corresponding to the backlash amount G is the movement amount of the image surface when the focus lens is driven by the same amount as the backlash amount G, and is calculated according to the following formula in the present embodiment. To do.
Image plane movement amount I _G corresponding to backlash amount G=backplay amount G×minimum image plane movement coefficient K _min

Next, in step S204, the camera control unit 21 causes the above-described step S203.
A process of comparing the image plane movement amount I _G corresponding to the backlash amount G calculated in step S with the predetermined image plane movement amount I _P is performed, and as a result of the comparison, the image plane movement amount I _G corresponding to the backlash amount _G. Is less than or equal to the predetermined image plane movement amount I _P , that is, “the image plane movement amount I _G corresponding to the backlash amount _G ”≦“the predetermined image plane movement amount I _P ”.
Whether or not is established is determined. The predetermined image plane movement amount I _P is set corresponding to the focal depth of the optical system, and is usually set to the image plane movement amount corresponding to the focal depth. Further, since the predetermined image plane movement amount I _P is set to the depth of focus of the optical system, it is appropriately set according to the F value, the cell size of the image sensor 22, and the format of the image to be captured. Can be That is, the larger the F value, the larger the predetermined image plane movement amount I _P can be set.
Alternatively, the larger the cell size of the image sensor 22 or the smaller the image format, the larger the predetermined image plane movement amount I _P can be set. If the image plane movement amount I _G corresponding to the backlash amount G is less than or equal to the predetermined image plane movement amount I _P , the process proceeds to step S205. On the other hand, when the image plane movement amount I _G corresponding to the backlash amount G is larger than the predetermined image plane movement amount I _P , the process proceeds to step S206.

In step S205, since it is determined in step S204 described above that the image plane movement amount I _G corresponding to the backlash amount G is equal to or less than the predetermined image plane movement amount I _P , the backlash reduction drive is not performed in this case. Even in this case, it is determined that the lens position of the focus lens 33 after driving can be set within the depth of focus of the optical system, and it is determined not to perform the rattling driving during the focus driving, and based on the determination, the rattling is performed. Focus drive is performed without drive. That is, when the focus drive is performed, it is determined that the focus lens 33 is directly driven to the in-focus position, and based on the determination, as shown in FIG. Focus drive.

On the other hand, in step S206, since it is determined in step S204 described above that the image plane movement amount I _G corresponding to the backlash amount G is larger than the predetermined image plane movement amount I _P , in this case, the backlash reduction drive is performed. Otherwise, it is determined that the lens position of the focus lens 33 after driving cannot be set within the depth of focus of the optical system, and it is determined that the backlash reduction drive is performed during the focus drive.
Based on the determination, focusing drive with backlash reduction drive is performed. That is, the focus lens 3
3 is driven to perform the focus drive, it is determined that the focus position is once passed and then the reverse drive is performed again to drive to the focus position. As shown in (A), focusing drive accompanied by backlash reduction drive is performed.

In the third embodiment, as described above, the image plane movement amount I _G corresponding to the backlash amount G is calculated based on the information on the minimum image plane movement coefficient K _min and the backlash amount G of the drive transmission mechanism of the focus lens 33. Is calculated and it is determined whether or not the image plane movement amount I _G corresponding to the calculated backlash amount G is less than or equal to a predetermined image plane movement amount I _P corresponding to the depth of focus of the optical system. When performing driving, rattling control is performed to determine whether to perform rattling driving. As a result of the determination, the image plane movement amount I _G corresponding to the backlash amount G is the predetermined image plane movement amount I _P corresponding to the focal depth of the optical system.
When the lens position of the focus lens 33 after driving can be set within the depth of focus of the optical system, the backlash reduction drive is not performed and the image plane movement amount I corresponding to the backlash amount G is not satisfied. _{If G} is larger than the predetermined image plane movement amount I _P corresponding to the depth of focus of the optical system and the backlash reduction drive is not performed, the lens position of the focus lens 33 after the drive may be within the depth of focus of the optical system. When it is not possible, the backlash reduction drive is performed. Therefore, according to the present embodiment,
When the backlash reduction drive is not necessary, the time required for the focusing drive can be shortened by not performing the backlash reduction drive, and thus the time required for the focusing operation can be shortened. On the other hand, when the backlash reduction drive is necessary, it is possible to improve the focusing accuracy by performing the backlash reduction drive.

Particularly, in the third embodiment, the minimum image plane movement coefficient K _min is used to calculate the image plane movement amount I _G corresponding to the backlash amount G of the drive transmission mechanism of the focus lens 33, and this is calculated by the optical system. By comparing with the predetermined image plane movement amount I _P corresponding to the depth of focus, it becomes possible to appropriately determine whether or not the backlash reduction drive at the time of focusing is necessary.

In the backlash reduction control according to the third embodiment described above, the camera control unit 21 may determine whether or not backlash reduction is necessary according to the focal length, the aperture, and the subject distance. Further, the camera control unit 21 may change the amount of drive for backlash reduction according to the focal length, the diaphragm, and the subject distance. For example, when the diaphragm is narrowed below a predetermined value (when the F value is large), it is necessary to eliminate backlash as compared to when the diaphragm is not narrowed below the predetermined value (when the F value is small). It may be determined or controlled so as to reduce the drive amount for backlash reduction. Furthermore, for example, on the wide side, it may be determined that backlash reduction is unnecessary, or control may be performed so that the drive amount for backlash reduction is smaller than on the telephoto side.

<<4th Embodiment>>
Next, a fourth embodiment of the invention will be described. In the fourth embodiment, the camera 1 shown in FIG. 1 has the same configuration as that of the first embodiment described above except that the camera 1 operates as described below.

That is, in the fourth embodiment, the clipping operation (silent control) described below is performed. In the fourth embodiment, in the search control by the contrast detection method, the moving speed of the image plane of the focus lens 33 is controlled to be constant, while the search control by the contrast detection method drives the focus lens 33. Clip operation for suppressing sound is performed. Here, the clipping operation performed in the fourth embodiment is an operation of clipping the speed of the focus lens 33 so as not to be less than the silent lower limit lens moving speed when the speed of the focus lens 33 becomes slow and hinders noise reduction. is there.

In the fourth embodiment, as will be described later, the camera control unit 21 of the camera body 2 uses a predetermined coefficient (Kc) to set a predetermined silent sound lower limit lens moving speed V0b and a focus lens driving speed V1a. By comparing, it is determined whether or not the clip operation should be performed.

Then, when the clipping operation is permitted by the camera control unit 21, the lens control unit 37 sets the drive speed of the focus lens 33 so that the drive speed V1a of the focus lens 33, which will be described later, does not become less than the silent minimum lens movement speed V0b. Silent lower limit Lens movement speed is limited by V0b. Hereinafter, a detailed description will be given with reference to the flowchart shown in FIG. Here, FIG.
2 is a flowchart showing a clipping operation (silent control) according to the fourth embodiment.

In step S301, the lens control unit 37 acquires the silent noise lower limit lens moving speed V0b. The silent sound lower limit lens moving speed V0b is stored in the lens memory 38, and the lens control unit 37 can acquire the silent sound lower limit lens moving speed V0b from the lens memory 38.

In step S302, the lens control unit 37 acquires the drive instruction speed of the focus lens 33. In the present embodiment, the command control speed of the focus lens 33 is transmitted from the camera control unit 21 to the lens control unit 37 by command data communication. The drive instruction speed of 33 can be acquired.

In step S303, the lens control unit 37 compares the silent lower limit lens movement speed V0b acquired in step S301 with the drive instruction speed of the focus lens 33 acquired in step S302. Specifically, the lens control unit 37 determines whether or not the drive instruction speed (unit: pulse/second) of the focus lens 33 is less than the silent lower limit lens moving speed V0b (unit: pulse/second), and the focus is determined. If the drive instruction speed of the lens 33 is less than the silent lower limit lens moving speed, the process proceeds to step S304. On the other hand, if the drive instruction speed of the focus lens 33 is not less than the silent lower limit lens moving speed V0b, the process proceeds to step S305. move on.

In step S304, it is determined that the drive instruction speed of the focus lens 33 transmitted from the camera body 2 is less than the silent minimum lens movement speed V0b. In this case, the lens control unit 37 drives the focus lens 33 at the silent sound lower limit lens moving speed V0b in order to suppress the drive sound of the focus lens 33. As described above, the lens control unit 37 limits the lens drive speed V1a of the focus lens 33 to the silent sound lower limit lens moving speed V0b when the drive instruction speed of the focus lens 33 is less than the silent sound lower limit lens moving speed V0b.

On the other hand, in step S305, it is determined that the drive instruction speed of the focus lens 33 transmitted from the camera body 2 is equal to or higher than the silent lower limit lens moving speed V0b. In this case, since the drive sound of the focus lens 33 that is equal to or larger than the predetermined value is not generated (or the drive sound is extremely small), the lens control unit 37 drives the focus lens 33 to drive the focus lens 33 transmitted from the camera body 2. Drive at the indicated speed.

Here, FIG. 13 is a graph for explaining the relationship between the lens driving speed V1a of the focus lens 33 and the silent minimum lens moving speed V0b, where the vertical axis is the lens driving speed and the horizontal axis is the image plane movement coefficient K. Is the graph. As shown on the horizontal axis in FIG. 13, the image plane movement coefficient K
Changes according to the lens position of the focus lens 33. In the example shown in FIG. 13, the image plane movement coefficient K becomes smaller toward the near side and the image plane movement coefficient K becomes larger toward the infinity side. There is a tendency. On the other hand, in this embodiment, when the focus lens 33 is driven during the focus detection operation, the focus lens 33 is driven at a speed such that the moving speed of the image surface becomes constant. As shown, the actual driving speed V1a of the focus lens 33 changes according to the lens position of the focus lens 33. That is, in the example shown in FIG. 13, when the focus lens 33 is driven so that the moving speed of the image plane becomes constant, the lens moving speed V1a of the focus lens 33 becomes slower toward the near side and becomes closer to the infinity side. It will be faster.

On the other hand, when the focus lens 33 is driven as shown in FIG. 13, the image plane moving speed in such a case is constant as shown in FIG. FIG. 15 is a graph for explaining the relationship between the image plane moving speed V1a by driving the focus lens 33 and the silent lower limit image plane moving speed V0b_max, where the vertical axis represents the image surface moving speed and the horizontal axis represents the image. It is a graph which made surface movement coefficient K. In FIGS. 13 and 15, both the actual driving speed of the focus lens 33 and the image plane moving speed due to the driving of the focus lens 33 are represented by V1a. Therefore, V1a is variable (not parallel to the horizontal axis) when the vertical axis of the graph is the actual drive speed of the focus lens 33, as shown in FIG.
As shown in FIG. 15, when the vertical axis of the graph is the image plane moving speed, it is a constant value (parallel to the horizontal axis).

Then, when the clipping operation is not performed when the focus lens 33 is driven so that the moving speed of the image plane becomes constant, as shown in FIG.
The lens driving speed V1a may be less than the silent minimum lens moving speed V0b. For example, at the position of the focus lens 33 where the minimum image plane movement coefficient K _min is obtained (minimum image plane movement coefficient K _min =100 in FIG. 13), the lens moving speed V1a becomes less than the silent lower limit lens moving speed V0b. ..

In particular, when the focal length of the lens barrel 3 is long or the light environment is bright, the lens moving speed V1a of the focus lens 33 tends to be less than the silent lower limit lens moving speed V0b. In such a case, the lens control unit 37 performs the clipping operation to limit the drive speed V1a of the focus lens 33 to the silent minimum lens moving speed V0b (from the silent minimum lens moving speed V0b as shown in FIG. Can be controlled so that it does not become too slow) (step S
304), whereby the drive sound of the focus lens 33 can be suppressed.

Next, with reference to FIG. 14, a clip operation control process for determining whether to permit or prohibit the clip operation shown in FIG. 12 will be described. FIG. 14 is a flowchart showing the clip operation control processing according to this embodiment. Note that the clip operation control process described below is executed by the camera body 2 when, for example, the AF-F mode or the moving image shooting mode is set.

First, in step S401, the lens information is acquired by the camera control unit 21. Specifically, the camera control unit 21 uses the hot line communication to determine the current image plane movement coefficient K _cur.
, Minimum image plane movement coefficient K _min , maximum image plane movement coefficient K _max , and silent lower limit lens movement speed V0
b is acquired from the lens barrel 3.

Then, in step S402, the camera control unit 21 controls the silent sound lower limit image plane moving speed V0.
Calculation of b_max is performed. The silent sound lower limit image plane moving speed V0b_max means the focus lens 33 at the position of the focus lens 33 where the minimum image plane moving coefficient K _min is obtained.
It is the moving speed of the image plane when the lens is driven at the above-described silent sound lower limit lens moving speed V0b. The silent lower limit image plane moving speed V0b_max will be described in detail below.

First, as shown in FIG. 13, whether or not a driving sound is generated by driving the focus lens 33 is determined by the actual driving speed of the focus lens 33, and therefore,
As shown in FIG. 13, the silent sound lower limit lens moving speed V0b is a constant speed when expressed by the lens driving speed. On the other hand, when the silent lower limit lens moving speed V0b is represented by the image surface moving speed, the image surface moving coefficient K changes according to the lens position of the focus lens 33 as described above. , As shown in FIG. 13 and 15, the silent lower limit lens moving speed (the lower limit of the actual drive speed of the focus lens 33) and the image plane moving speed when the focus lens 33 is driven at the silent lower limit lens moving speed. Are both represented by V0b. Therefore, V0b becomes a constant value (parallel to the horizontal axis) when the vertical axis of the graph is the actual drive speed of the focus lens 33 as shown in FIG. 13, and the vertical axis of the graph is as shown in FIG. When the axis is the image plane moving speed, it is variable (not parallel to the horizontal axis).

In the present embodiment, the focus lens 33 that obtains the minimum image plane movement coefficient K _min when the focus lens 33 is driven such that the silent sound lower limit image plane movement velocity V0b_max is constant. Position (in the example shown in FIG. 15, image plane movement coefficient K=100)
In, the moving speed of the focus lens 33 is set to the image plane moving speed which is the silent lower limit lens moving speed V0b. That is, in this embodiment, when the focus lens 33 is driven at the silent sound lower limit lens moving speed, the maximum image surface moving speed (in the example shown in FIG. 15, the image surface moving at the image surface moving coefficient K=100) is obtained. Speed) is set as the silent minimum image plane moving speed V0b_max.

As described above, in the present embodiment, it changes according to the lens position of the focus lens 33,
Of the image plane moving speeds corresponding to the silent lower limit lens moving speed V0b, the maximum image plane moving speed (the image plane moving speed at the lens position where the image surface moving coefficient is the minimum) is defined as the silent lower limit image surface moving speed V.
It is calculated as 0b_max. For example, in the example shown in FIG. 15, the minimum image plane movement coefficient K
_{Since min} is “100”, the image plane moving speed at the lens position of the focus lens 33 where the image plane moving coefficient is “100” is calculated as the silent minimum image plane moving speed V0b_max.

Specifically, the camera control unit 21 controls the silent lower limit lens moving speed V0 as shown in the following formula.
Based on b (unit: pulse/sec) and the minimum image plane movement coefficient K _min (unit: pulse/mm), the silent lower limit image plane movement speed V0b_max (unit: mm/sec) is calculated.
Silent lower limit image plane moving speed V0b_max=Silent lower limit lens moving speed (actual drive speed of focus lens) V0b/Minimum image surface moving coefficient K _min

As described above, in the present embodiment, the silent image lower limit image plane moving speed V0b_max is calculated by using the minimum image plane moving coefficient K _min , so that the silent noise lower limit is reached at the timing when the focus detection or the moving image shooting by the AF-F is started. The image plane moving speed V0b_max can be calculated. For example, in the example shown in FIG. 15, when focus detection by AF-F or moving image shooting is started at timing t1′, the lens of the focus lens 33 whose image plane movement coefficient K becomes “100” at this timing t1′. The image plane moving speed at the position is defined by the silent lower limit image plane moving speed V
It can be calculated as 0b_max.

Next, in step S403, the camera control unit 21 compares the image surface moving speed V1a for focus detection acquired in step S401 with the silent sound lower limit image surface moving speed V0b_max calculated in step S402. Specifically, the camera control unit 21 causes the image plane moving speed V1a for focus detection (unit: mm/sec) and the silent lower limit image plane moving speed V0b_max (unit:
mm/sec) and whether the following formula is satisfied.
(Image plane moving speed for focus detection V1a×Kc)>Lower silent image plane moving speed V0b_max
In the above equation, the coefficient Kc is a value of 1 or more (Kc≧1), and details thereof will be described later.

When the above formula is satisfied, the process proceeds to step S404, and the camera control unit 21 causes
The clip operation shown in is permitted. That is, in order to suppress the drive sound of the focus lens 33, as shown in FIG. 13, the drive speed V1a of the focus lens 33 is limited to the silent sound lower limit lens moving speed V0b (the drive speed V1a of the focus lens 33 is the silent sound lower limit). The search control is performed so that the speed does not become lower than the lens moving speed V0b.)

On the other hand, if the above expression is not satisfied, the process proceeds to step S405, and the clip operation shown in FIG. 12 is prohibited. That is, focusing is performed without restricting the drive speed V1a of the focus lens 33 to the silent lower limit lens moving speed V0b (allowing the drive speed V1a of the focus lens 33 to be lower than the silent lower limit lens moving speed V0b). The focus lens 33 is driven so that the image plane moving speed V1a can appropriately detect the position.

Here, as shown in FIG. 13, if the clipping operation is permitted and the drive speed of the focus lens 33 is limited by the silent sound lower limit lens moving speed V0b, the image surface moves at the lens position where the image surface moving coefficient K is small. Of the image plane becomes faster, and as a result, the moving speed of the image plane becomes faster than the image plane moving rate at which the in-focus position can be appropriately detected, and it may not be possible to obtain appropriate focusing accuracy. On the other hand, when the clipping operation is prohibited and the focus lens 33 is driven so that the moving speed of the image surface becomes the moving speed of the image surface that can appropriately detect the in-focus position, as shown in FIG. The drive speed V1a of the focus lens 33 may be less than the silent sound lower limit lens moving speed V0b, and a drive sound of a predetermined value or more may be generated.

Thus, the image plane moving speed V1a for focus detection is lower than the silent image plane moving speed V0b_max.
If it is less than the above, the focus lens 33 is driven at a lens driving speed less than the silent minimum lens moving speed V0b so that the image plane moving speed V1a capable of appropriately detecting the in-focus position can be obtained. In order to suppress the driving sound, there may be a problem whether the focus lens 33 is driven at a lens driving speed equal to or higher than the silent sound lower limit lens moving speed V0b.

On the other hand, in the present embodiment, even if the coefficient Kc in the above equation is driven by the silent lens lower limit lens moving speed V0b, a certain focus detection accuracy can be secured if the above equation is satisfied. It is stored as a value of 1 or more. As a result, the camera control unit 2
15, as shown in FIG. 15, the image plane moving speed V1a for focus detection is the silent lower limit image plane moving speed V1.
Even if it is less than 0b_max, if the above formula is satisfied, it is determined that a certain focus detection accuracy can be ensured, and priority is given to suppressing the drive sound of the focus lens 33, and the focus lens 33 is set to the silent minimum lens moving speed. The clip operation to be driven at a lens driving speed less than V0b is permitted.

On the other hand, if the image plane moving speed V1a×Kc (Kc≧1) at the time of focus detection is equal to or lower than the silent sound lower limit image surface moving speed V0b_max, the clipping operation is permitted and the drive speed of the focus lens 33 is silent. If the lower limit lens movement speed V0b is used as the limit, the image plane movement speed for focus detection becomes too fast, and it may not be possible to ensure focus detection accuracy.
Therefore, when the above expression is not satisfied, the camera control unit 21 gives priority to focus detection accuracy and prohibits the clip operation shown in FIG. Accordingly, at the time of focus detection, the moving speed of the image surface can be set to the image surface moving speed V1a that can appropriately detect the in-focus position, and the focus detection can be performed with high accuracy.

When the aperture value is large (the aperture opening is small), the depth of field becomes deep, so the sampling interval at which the in-focus position can be properly detected becomes wide. As a result, it is possible to increase the image plane moving speed V1a that can appropriately detect the in-focus position. for that reason,
When the image plane moving speed V1a capable of appropriately detecting the in-focus position has a fixed value,
The camera control unit 21 can increase the coefficient Kc in the above expression as the aperture value increases.

Similarly, when the image size is small such as a live view image (when the image compression rate is high or when the pixel data thinning rate is high), high focus detection accuracy is not required.
The coefficient Kc of the above equation can be increased. Further, even when the pixel pitch in the image sensor 22 is wide, the coefficient Kc in the above equation can be increased.

Next, the control of the clip operation will be described in more detail with reference to FIGS. FIG. 16 is a diagram showing the relationship between the moving speed V1a of the image plane at the time of focus detection and the clipping operation, and FIG. 17 describes the relationship between the actual lens driving speed V1a of the focus lens 33 and the clipping operation. FIG.

For example, as described above, in the present embodiment, when the search control is started by the half-press of the release switch as a trigger and when the search control is started by the condition other than the half-press of the release switch as the trigger, the still image shooting mode is set. The moving speed of the image plane in the search control may differ depending on the moving image shooting mode, sports shooting mode and landscape shooting mode, or the focal length, shooting distance, aperture value, and the like. In FIG. 16, such moving speeds V1a of three different image planes are used.
_1, V1a_2, and V1a_3 are illustrated.

Specifically, the image plane moving speed V1a_1 at the time of focus detection shown in FIG. 16 is the maximum moving speed of the image planes that can appropriately detect the focus state, and the image plane moving speed V1a_1 The speed of movement. Further, the image plane moving speed V1a_2 at the time of focus detection is an image plane moving speed slower than V1a_1, but is an image plane moving speed satisfying the relationship of the above expression at the timing t1′. On the other hand, the image plane moving speed V1a_3 at the time of focus detection is the moving speed of the image plane that does not satisfy the above expression.

Thus, in the example shown in FIG. 16, when the moving speed of the image plane at the time of focus detection is V1a_1 and V1a_2, the relationship of the above equation is satisfied at the timing t1.
The clip operation shown in 6 is permitted. On the other hand, when the moving speed of the image plane at the time of focus detection is V1a_3, the relationship of the above expression is not satisfied, and therefore the clipping operation shown in FIG. 12 is prohibited.

This point will be specifically described with reference to FIG. Note that FIG. 17 is a diagram in which the vertical axis of the graph shown in FIG. 16 is changed from the image plane moving speed to the lens driving speed. As described above, since the lens driving speed V1a_1 of the focus lens 33 satisfies the relationship of the above expression (3), the clip operation is permitted. However, as shown in FIG. 17, even at the lens position where the minimum image plane movement coefficient (K=100) is obtained, the lens driving speed V1a_1 does not become less than the silent lower limit lens movement speed V0b, and therefore the clip actually occurs. No action is taken.

Further, since the lens driving speed V1a_2 of the focus lens 33 also satisfies the relationship of the above expression at the timing t1′ which is the start timing of focus detection, the clipping operation is permitted. In the example shown in FIG. 17, when the focus lens 33 is driven at the lens driving speed V1a_2, the lens driving speed V1a_2 is set at the lens position where the image plane movement coefficient K becomes K1.
Is less than the silent minimum lens moving speed V0b, the lens driving speed V1a_2 of the focus lens 33 is limited by the silent minimum lens moving speed V0b at the lens position where the image plane moving coefficient K is smaller than K1.

That is, the clipping operation is performed at the lens position where the lens driving speed V1a_2 of the focus lens 33 is less than the silent minimum lens moving speed V0b, whereby the moving speed V1a_2 of the image plane at the time of focus detection is the same as that of the image surface before that. The focus evaluation value search control is performed at a moving speed of the image plane that is different from the moving speed (search speed) of. That is, as shown in FIG. 16, at the lens position where the image plane movement coefficient is smaller than K1, the image plane movement velocity V1a_2 at the time of focus detection is different from the constant velocity up to now.

Further, since the lens driving speed V1a_3 of the focus lens 33 does not satisfy the relationship of the above expression, the clipping operation is prohibited. Therefore, in the example shown in FIG. 17, when the focus lens 33 is driven at the lens driving speed V1a_3, the lens driving speed V1a_3 is less than the silent lower limit lens moving speed V0b at the lens position where the image plane moving coefficient K becomes K2. However, at the lens position where the image plane movement coefficient K smaller than K2 is obtained, the clipping operation is not performed, and in order to appropriately detect the focus state, the drive speed V1a_3 of the focus lens 33.
The clipping operation will not be performed even if is less than the silent minimum lens moving speed V0b.

As described above, in the fourth embodiment, the maximum image plane moving speed among the image plane moving speeds when the focus lens 33 is driven at the silent sound lower limit lens moving speed V0b is calculated as the silent sound lower limit image surface moving speed V0b_max. Then, the calculated silent noise lower limit image plane moving speed V0b_max is compared with the image plane moving speed V1a at the time of focus detection. When the image plane moving speed V1a×Kc (Kc≧1) at the time of focus detection is faster than the silent lower limit image surface moving speed V0b_max, the focus lens 33 is driven at the silent lower limit lens moving speed V0b. Even in such a case, it is determined that the focus detection accuracy of a certain level or more can be obtained, and the clipping operation shown in FIG. 12 is permitted.
As a result, in the present embodiment, it is possible to suppress the drive sound of the focus lens 33 while ensuring focus detection accuracy.

On the other hand, when the moving speed V1a×Kc (Kc≧1) of the image surface at the time of focus detection is equal to or lower than the silent lower limit moving speed V0b_max, the drive speed V1a of the focus lens 33 is set to the silent lower lens moving speed V0b. In the case of limiting, there are cases where proper focus detection accuracy cannot be obtained. Therefore, in this embodiment, in such a case, the clipping operation shown in FIG. 12 is prohibited so that the image plane moving speed suitable for focus detection can be obtained. As a result, in the present embodiment, the focus position can be appropriately detected at the time of focus detection.

Further, in the present embodiment, the minimum image plane movement coefficient K _min is stored in advance in the lens memory 38 of the lens barrel 3, and using this minimum image plane movement coefficient K _min , the silent minimum image plane movement speed V0b.
Calculate _max. Therefore, in the present embodiment, for example, as shown in FIG. 10, the image plane moving speed V1a×Kc for focus detection (however, at the timing of time t1 when the focus detection in the moving image shooting or the AF-F mode is started, Kc≧1) is the silent minimum image plane moving speed V0b_max
It is possible to determine whether or not the clip operation is performed, and to determine whether to perform the clip operation. As described above, in the present embodiment, the current position image plane movement coefficient K _cur is not used to repeatedly determine whether or not the clipping operation is performed, but the minimum image plane movement coefficient K _min is used to _record a moving image or AF-F
Since it is possible to determine whether or not to perform the clipping operation at the first timing when the focus detection by the mode is started, it is possible to reduce the processing load of the camera body 2.

It should be noted that in the above-described embodiment, the configuration is shown in which the clip operation control process shown in FIG. 12 is executed in the camera body 2. However, the configuration is not limited to this configuration, and for example, the clip operation control process shown in FIG. It may be configured to be executed in the lens barrel 3.

Further, in the above-described embodiment, a configuration in which the image plane movement coefficient K is calculated by the image plane movement coefficient K=(driving amount of the focus lens 33/moving amount of the image plane) as shown in the above formula is exemplified. However, the configuration is not limited to this, and the configuration may be calculated as shown in the following formula, for example.
Image plane movement coefficient K=(image plane movement amount/focus lens 33 drive amount)
In this case, the camera control unit 21 can calculate the silent sound lower limit image plane movement speed V0b_max as follows. That is, the camera control unit 21 calculates, as shown in the following equation, the silent lower limit lens movement speed V0b (unit: pulse/second) and the image plane movement coefficient K at each lens position (focal length) of the zoom lens 32. Maximum image plane movement coefficient K _ma showing the maximum value
_{Based on x} (unit: pulse/mm), the silent sound lower limit image plane moving speed V0b_max (unit:
mm/sec) can be calculated.
Silent lower limit image plane moving speed V0b_max=Silent lower limit lens moving speed V0b/maximum image plane moving coefficient K _max

For example, when the value calculated by "the amount of movement of the image plane/the amount of drive of the focus lens 33" is adopted as the image plane movement coefficient K, the larger the value (absolute value) is, the more the focus lens has the predetermined value ( The amount of movement of the image plane when driven (for example, 1 mm) increases. When the value calculated by “the driving amount of the focus lens 33/the moving amount of the image plane” is adopted as the image plane movement coefficient K, the larger the value (absolute value) is, the more the focus lens has a predetermined value (for example, 1 mm). ) The amount of movement of the image plane when driven is small.

In addition to the above-described embodiment, when the silent mode for suppressing the drive sound of the focus lens 33 is set, the above-described clip operation and the clip operation control process are executed, and the silent mode is not set. Alternatively, the clip operation and the clip operation control process described above may not be executed. When the silent mode is set, the suppression of the drive sound of the focus lens 33 is prioritized, and the clip operation shown in FIG. 12 may be always performed without performing the clip operation control processing shown in FIG. ..
Further, in the above-described embodiment, the image plane movement coefficient K=(drive amount of the focus lens 33/image plane movement amount) has been described, but the present invention is not limited to this. For example, if the image plane movement coefficient K=(image plane movement amount/driving amount of the focus lens 33) is defined, the maximum image plane movement coefficient K _max is used, and clipping operation or the like is performed in the same manner as in the above-described embodiment. Can be controlled.

<<Fifth Embodiment>>
Next, a fifth embodiment of the invention will be described. The fifth embodiment has the same configuration as the above-described first embodiment except that the following points are different. FIG. 18 shows a table showing the relationship between the lens position (focal length) of the zoom lens 32 and the lens position (shooting distance) of the focus lens 33, and the image plane movement coefficient K used in the fifth embodiment.

That is, in the fifth embodiment, areas “D0”, “X1”, and “X2” that are areas closer to the closest side than the area “D1” that is the closest side shown in FIG. 3 are provided. .. Similarly, “D10”, “X3”, and “X4” regions, which are regions closer to infinity than the region “D9” that is closest to infinity shown in FIG. 3, are provided. In the following, first, the areas closer to the near side, such as “D0”, “X1”, and “X2”, and the areas closer to infinity, such as “D10”, “X3”, and “X4”. The area will be described.

Here, as shown in FIG. 19, in the present embodiment, the focus lens 33 is configured to be movable in the infinity direction 410 and the close-up direction 420 on the optical axis L1 indicated by the alternate long and short dash line in the figure. ing. Stoppers (not shown) are provided at the mechanical end points (mechanical end points) 430 in the infinity direction 410 and the mechanical end points 440 in the close-up direction 420 to limit the movement of the focus lens 33. That is, the focus lens 33 is configured to be movable from a mechanical end point 430 in the infinity direction 410 to a mechanical end point 440 in the close-up direction 420.

However, the range in which the lens controller 37 actually drives the focus lens 33 is smaller than the range from the mechanical end point 430 to the mechanical end point 440 described above. More specifically, the lens control section 37 moves from the infinite soft limit position 450 provided inside the mechanical end point 430 in the infinity direction 410 to the mechanical end point 44 in the close range 420.
Focus lens 3 within the range up to the closest soft limit position 460 provided inside 0
Drive 3 That is, the lens driving unit 212 drives the focus lens 33 between the close-up soft limit position 460 corresponding to the close-side drive limit position and the infinite soft limit position 450 corresponding to the infinite-side drive limit position.

The infinite soft limit position 450 is provided outside the infinite focused position 470. The infinity in-focus position 470 is the position of the focus lens 33 corresponding to the most infinity side position where the imaging optical system including the lenses 31, 32, 33, 34 and the diaphragm 35 can be in focus. The reason for providing the infinite soft limit position 450 at such a position is that there is a peak of the focus evaluation value at the infinite focusing position 470 when the focus detection is performed by the contrast detection method. That is, if the infinite focus position 470 is made to coincide with the infinite soft limit position 450, there is a problem that the peak of the focus evaluation value existing at the infinite focus position 470 cannot be recognized as a peak. In order to avoid the above, the infinite soft limit position 450 is provided outside the infinite focusing position 470. Similarly, the closest soft limit position 460 is provided outside the closest in-focus position 480. Here, the closest focus position 480 is
This is the position of the focus lens 33 corresponding to the closest position on which the photographing optical system including the lenses 31, 32, 33, 34 and the diaphragm 35 can focus.

The "D0" region shown in FIG. 18 is a position corresponding to the closest soft limit position 460, and the "X1" and "X2" regions are regions closer to the closest soft limit position, for example, the closest direction 420. The position corresponding to the mechanical end point 440, the position between the closest soft limit position and the end point 440, and the like. Further, the “D10” area shown in FIG. 18 is a position corresponding to the infinite soft limit position 450, and the “X3” and “X4” areas are areas on the infinite side of the infinite soft limit position, for example, the infinity direction. A position corresponding to the mechanical end point 430 of 410, a position between the infinite soft limit position and the end point 430, and the like.

In the present embodiment, of these areas, the closest soft limit position 460
Image plane movement coefficients “K10”, “K20”,..., “K90” in the “D0” region corresponding to
Can be set to the minimum image plane movement coefficient K _min . Similarly, the image plane movement coefficients “K110”, “K210”, in the “D10” region corresponding to the infinite soft limit position 450,
... The "K910", can be set to the maximum image plane shift factor K _max.

In the present embodiment, the image plane movement coefficients “α11” and “α2” in the “X1” region are set.
The values of "1",..., "α91" are the image plane movement coefficients "K10" and "K2" in the "D0" region.
It is smaller than the value of "0",... "K90". Similarly, the values of the image plane movement coefficients “α12”, “α22”,... “α92” in the “X2” area are the same as the image plane movement coefficients “K10”, “K20”,... In the “D0” area. It is smaller than the value of "K90". Further, the values of the image plane movement coefficients “α13”, “α23”,... “α93” in the “X3” area are the image plane movement coefficients “K110”, “K210”,... “In the “D10” area. It is larger than the value of "K910". The values of the image plane shift coefficients “α14”, “α24”,... “α94” in the “X4” region are the image plane shift factors “K110”, “K210”,... “K910” in the “D10” region.
Is larger than the value of.

However, on the other hand, in the present embodiment, the image plane movement coefficient K (“K1
0", "K20",... "K90") is set to the minimum image plane movement coefficient K _min , and "D10
Image plane shift factor K in "(" K110 "," K210 ":" K910 ") is set to the maximum image plane shift factor K _max. In particular, the “X1”, “X2”, “X3”, and “X4” regions are regions where the focus lens 33 is not driven or there is little need to drive the focus lens 33 due to circumstances such as aberrations and mechanical mechanisms. is there. Therefore, "X1", "X2"
, “X3”, “X4” regions, image plane movement coefficients “α11”, “α21”,...
Even if "94" is set to the minimum image plane movement coefficient K _min or the maximum image plane movement coefficient K _max , it does not contribute to appropriate autofocus control (for example, focus lens speed control, silent control, backlash reduction control, etc.). is there.

In the present embodiment, the image plane movement coefficient in the “D0” area corresponding to the closest soft limit position 460 is set to the minimum image plane movement coefficient K _min , and the image in the “D10” area corresponding to the infinite soft limit position 450 is set. The surface movement coefficient is set to the maximum image surface movement coefficient K _max , but the invention is not limited to this.

For example, the image plane movement coefficients corresponding to the areas “X1” and “X2” on the near side of the close soft limit position and the areas “X3” and “X4” on the infinite side of the infinite soft limit position are lens memory 38. Even if it is stored in, the smallest image plane movement coefficient among the image plane movement coefficients corresponding to the position of the focus lens included in the search range (scan range) of the contrast AF is set to the minimum image plane movement coefficient K _min. , The largest image plane movement coefficient among the image plane movement coefficients corresponding to the position of the focus lens included in the search range of the contrast AF is the maximum image plane movement coefficient K.
_May be set to _max . Further, the image plane movement coefficient corresponding to the closest focus position 480 is set to the minimum image plane movement coefficient K _min , and the image plane movement coefficient corresponding to the infinite focus position 470 is set to the maximum image plane movement coefficient K _max. Good.

Alternatively, in the present embodiment, the focus lens 33 is moved to the closest soft limit position 4
The image plane movement coefficient K may be set so that the image plane movement coefficient K becomes a minimum value when driven near 60. That is, the image plane movement coefficient K becomes the minimum value when the focus lens 33 is driven near the closest soft limit position 460 rather than when the focus lens 33 is moved from the closest soft limit position 460 to the infinite soft limit position 450. The image plane movement coefficient K may be set as described above.
Similarly, the image plane movement coefficient K may be set so that the image plane movement coefficient K becomes the maximum value when the focus lens 33 is driven near the infinite soft limit position 450. That is,
Move the focus lens 33 from the closest soft limit position 460 to the infinite soft limit position 45.
The image plane movement coefficient K may be set so that the image plane movement coefficient K when driven near the infinite soft limit position 450 becomes the maximum value than when moved to any one up to 0.

<<6th Embodiment>>
Next, a sixth embodiment of the present invention will be described. The sixth embodiment has the same configuration as the above-described first embodiment, except for the following points. That is, in the above-described first embodiment, in the camera 1 shown in FIG. 1, the lens memory 3 of the lens barrel 3 is used.
The minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max are stored in No. 8 and the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max are transmitted to the camera body. ..
On the other hand, in the sixth embodiment, the lens control unit 37 corrects the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max stored in the lens memory 38 according to the temperature, and this is corrected by the camera. It is transmitted to the body 2.

Here, FIG. 20 is a diagram for explaining a method of correcting the minimum image plane movement coefficient K _min according to temperature. In the present embodiment, the lens barrel 3 is configured to include a temperature sensor (not shown), and the minimum image plane movement coefficient K _min is corrected by the temperature detected by the temperature sensor, as shown in FIG. It has a different configuration. That is, in the present embodiment, the lens memory 38
The minimum image plane shift factor K _min stored in, the minimum image plane shift factor K _min at room temperature (25 ° C.), for example, as shown FIG. 20 down, the minimum image plane shift factor stored in the lens memory 38 When K _min has a value of “100” and the temperature sensor detects that the temperature of the lens barrel is room temperature (25° C.), the lens controller 37 causes the camera body 2 to move to the minimum image plane movement coefficient K. _min Send "100". On the other hand, the temperature of the lens barrel is 5 due to the temperature sensor.
When it is detected that the temperature is 0° C., the lens control unit 37 corrects the minimum image plane movement coefficient K _min “100” stored in the lens memory 38 to obtain the minimum image plane movement coefficient K _min “102”. To the camera body. Similarly, when the temperature sensor detects that the temperature of the lens barrel 3 is 80° C., the lens control unit 37 sets the minimum image plane movement coefficient K _min “100” stored in the lens memory 38. The corrected minimum image plane movement coefficient K _min “104” is transmitted to the camera body.

In the above description, the minimum image plane movement coefficient K _min has been described as an example, but the maximum image plane movement coefficient K _max also depends on the temperature of the lens barrel 3 like the minimum image plane movement coefficient K _min . Corrections can be made.

According to the sixth embodiment, the minimum image plane movement coefficient K _min that changes according to the temperature of the lens barrel 3.
Is transmitted to the camera body, an appropriate autofocus control (even when the temperature of the lens barrel 3 changes) by using the minimum image plane movement coefficient K _min that has changed according to the temperature of the lens barrel 3.
For example, speed control of the focus lens, silent control, backlash reduction control, etc.) can be realized.

<<Seventh Embodiment>>
Next, a seventh embodiment of the present invention will be described. The seventh embodiment has the same configuration as that of the above-described first embodiment except that the following points are different. That is, in the seventh embodiment, the lens control unit 37 corrects the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max stored in the lens memory 38 according to the driving time of the lens barrel 3. This is transmitted to the camera body 2.

Here, FIG. 21 is a diagram for explaining a method of correcting the minimum image plane movement coefficient K _min according to the driving time of the lens barrel 3. In the present embodiment, the lens barrel 3 is configured to include a timer (not shown), and the minimum image plane movement coefficient K is set by the driving time of the lens barrel 3 measured by the timer, as shown in FIG. Configure to correct _min . Normally, when the lens barrel 3 is driven for a long time, the temperature of the lens barrel 3 rises due to heat generated by a motor or the like that drives the lens barrel 3, so the driving time of the lens barrel 3 (shooting time, power of the camera is turned on). The temperature of the lens barrel rises according to the amount of time that the lens barrel is operating. Therefore, in the seventh embodiment, the minimum image plane movement coefficient K _min is corrected according to the driving time of the lens barrel 3.

For example, in FIG. 21, when the minimum image plane movement coefficient K _min stored in the lens memory 38 has a value of “100”, the lens barrel 3 is set by the timer provided in the lens barrel 3.
When it is detected that the driving time of is less than 1 hour, the lens controller 37 transmits the minimum image plane movement coefficient K _min “100” to the camera body. On the other hand, when the timer of the lens barrel 3 detects that the driving time of the lens barrel 3 is 1 hour or more and less than 2 hours, the lens control unit 37 causes the minimum image plane movement coefficient stored in the lens memory 38. K _min “100” is corrected and the minimum image plane movement coefficient K _min “102” is transmitted to the camera body. Similarly, when the timer of the lens barrel 3 detects that the driving time of the lens barrel 3 is at least 2 hours and less than 3 hours, the lens controller 37 causes the minimum image plane movement stored in the lens memory 38. Coefficient K _min “1
00" is corrected and the minimum image plane movement coefficient K _min "104" is transmitted to the camera body.

In the above description, the minimum image plane movement coefficient K _min has been described as an example, but the maximum image plane movement coefficient K _max also depends on the driving time of the lens barrel 3 like the minimum image plane movement coefficient K _min. Correction can be performed.

According to the seventh embodiment, the temperature of the lens barrel 3 is detected by the driving time of the lens barrel 3,
Since the minimum image plane movement coefficient K _min that changes according to the temperature of the lens barrel 3 is transmitted to the camera body, the minimum image plane movement coefficient K _min that changes according to the temperature of the lens barrel is used to calculate the lens barrel. Even when the temperature changes, appropriate autofocus control (for example, speed control of the focus lens, silent control, backlash reduction control, etc.) can be realized.

<<Eighth Embodiment>>
Next, an eighth embodiment of the invention will be described. The eighth embodiment has the same configuration as the above-described first embodiment except that the following points are different. That is, in the above-described first embodiment, in the camera 1 shown in FIG. 1, the lens memory 3 of the lens barrel 3 is used.
The minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max are stored in No. 8 and the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max are transmitted to the camera body. ..
On the other hand, in the eighth embodiment, the lens control unit 37 calculates the maximum predetermined coefficient K0 _max and the minimum predetermined coefficient K0 _min by performing a predetermined calculation on the current position image plane movement coefficient K _cur to obtain the maximum image plane. Instead of the movement coefficient K _max and the minimum image plane movement coefficient K _min , the maximum predetermined coefficient K0 _max and the minimum predetermined coefficient K0 _min are transmitted to the camera body 2. This is because the camera body 2 performs optimum control according to the lens position of the focus lens 33 (for example, speed control of the focus lens, silent control, backlash reduction control, etc.).

Here, FIG. 22 is a diagram for explaining the maximum predetermined coefficient K0 _max and the minimum predetermined coefficient K0 _min . As shown in FIG. 22, when the focus lens 33 changes from the close-up side position “D1” to the infinity side position “D9”, the current position image plane movement coefficient K _cur is 100, 120,... 600.
Shall change to.

Then, in the eighth embodiment, as shown in the example of A in FIG. 22, the minimum predetermined coefficient K0 _min may be calculated by adding a predetermined value to the current position image plane movement coefficient K _cur. it can. In the example of A of FIG. 22, the lens control unit 37, for example, calculates the minimum predetermined coefficient K0 _min using arithmetic expression (minimum predetermined coefficient K0 _min = moves the current position image plane coefficient Kc _ur +20), which camera Send to body 2. It should be noted that the maximum image plane movement coefficient K _max can also be obtained by the addition operation in the same manner as the minimum predetermined coefficient K 0 _min .

Alternatively, the example of B in FIG. 22 can be configured to calculate the minimum predetermined coefficient K0 _min by subtracting a predetermined value from the current position image plane movement coefficient K _cur . In the example of B of FIG. 22, the lens control unit 37, for example, calculates the minimum predetermined coefficient K0 _min using arithmetic expression (minimum predetermined coefficient K0 _min = current position image plane shift factor K _cur -20), this Camera body 2
Send to. It should be noted that the maximum image plane movement coefficient K _max can also be obtained by subtraction as in the case of the minimum predetermined coefficient K 0 _min .

Further, in FIG. 22, the example of C is an embodiment in which the minimum predetermined coefficient K0 _min is calculated by adding or subtracting a predetermined value to the current position image plane movement coefficient Kcur according to the moving direction of the focus lens 33. .. In the example of C of FIG. 22, the lens control unit 37 controls the focus lens 3
When 3 moves to the infinity side, an arithmetic expression (minimum predetermined coefficient K0 _min =current position image plane movement coefficient K _cur
+20) is used to calculate the minimum predetermined coefficient K0 _min , and this is transmitted to the camera body 2. On the contrary, when the focus lens 33 moves to the close side, the minimum predetermined coefficient K0 _min is calculated using the arithmetic expression (minimum predetermined coefficient K0 _min =current position image plane movement coefficient K _cur −20), and this is calculated as the camera body 2 Send to. The maximum image plane movement coefficient K _max can also be obtained by addition or subtraction as with the minimum predetermined coefficient K 0 _min .

Further, the example of D in FIG. 22 is an embodiment in which the minimum predetermined coefficient K0 _min is calculated by accumulating a predetermined value in the current position image plane movement coefficient K _cur . In the example of D of FIG. 22, the lens control unit 37 calculates the minimum predetermined coefficient K0 _min using arithmetic expression (minimum predetermined coefficient K0 _min = moves the current position image plane coefficient K _cur × 1.1), this Send to camera body 2. The maximum image plane movement coefficient K _max can also be calculated by the integration calculation as with the minimum predetermined coefficient K 0 _min .

In the example of A~D shown in FIG. 22, the necessity determination play elimination using a second coefficient having a value in the vicinity (minimum predetermined coefficient K0 _min) of the first coefficient (minimum predetermined coefficient K0 _min) It can be carried out. For example, in the case of A, when the position of the focus lens is in the area D9, the first coefficient (
Minimum predetermined coefficient K0 _min ) Second coefficient having a value near "600" (minimum predetermined coefficient K0 _min )
By using "620", it is possible to determine whether or not the backlash needs to be reduced. Therefore, for example, in a mode in which only the vicinity of the area D9 is searched (a mode in which only a part within the soft limit is searched, not the entire range of the soft limit), the image surface movement close to the image surface movement coefficient at the focus position is performed. It is possible to determine whether or not play needs to be reduced by using the coefficient.

<<9th Embodiment>>
Next, a ninth embodiment of the invention will be described. The ninth embodiment has the same configuration as that of the above-described first embodiment except that the following points are different. That is, in the above-described first embodiment, in the camera 1 shown in FIG. 1, the lens memory 3 of the lens barrel 3 is used.
The minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max are stored in No. 8 and the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max are transmitted to the camera body. ..
On the other hand, in the ninth embodiment, the correction coefficient K6, is stored in the lens memory 38 of the lens barrel 3.
K7 is stored, and the lens control unit 37 stores the correction coefficient K6 stored in the lens memory 38.
, K7 are used to correct the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max, and the corrected image plane movement coefficient K _max is transmitted to the camera body.

FIG. 23 is a diagram showing an example of manufacturing variation of the lens barrel 3. For example, in the present embodiment, in the lens barrel 3, the minimum image plane movement coefficient K _min is set to “100” at the design stage of the optical system and the mechanical mechanism design stage, and the minimum image plane movement coefficient is set in the lens memory 38. K _min "1
00” is stored. However, in the mass production process of the lens barrel 3, manufacturing variations occur due to manufacturing errors during mass production, and the minimum image plane movement coefficient K _min exhibits a normal distribution as shown in FIG.

Therefore, in this embodiment, the minimum image plane movement coefficient K _min in the mass production process of the lens barrel 3 is performed.
The correction coefficient K6=“+1” is obtained from the normal distribution of, and “+1” is stored in the lens memory 38 of the lens barrel 3 as the correction coefficient K6. Then, the lens control unit 37 and the minimum image plane movement coefficient K _min (“100”) stored in the lens memory 38 and the correction coefficient K6 (“+1”).
_{Is used} to correct the minimum image plane movement coefficient K _min (100+1=101), and the corrected minimum image plane movement coefficient K _min (“101”) is transmitted to the camera body 2.

In addition, for example, at the design stage of the optical system and the mechanical mechanism, the maximum image plane movement coefficient K _ma
x is set to “1000”, and the maximum image plane movement coefficient K _max “1000” is stored in the lens memory 38.
Is remembered. When the maximum image plane movement coefficient K _max in the mass production process is distributed according to the normal distribution, and the average of the maximum image plane movement coefficient K _max distributed according to the normal distribution is “990”, the lens memory 38 of the lens barrel 3 stores it. "-10" is stored as the correction coefficient K7.
Then, the lens control unit 37 _causes the maximum image plane movement coefficient K _max (stored in the lens memory 38)
“1000”) and the correction coefficient K7 (“−10”) are used to correct the maximum image plane movement coefficient K _max (1000−10=990), and the corrected maximum image plane movement coefficient K _max (“ 990″) to the camera body 2.

The minimum image plane movement coefficient K _min “100” and the maximum image plane movement coefficient K _max “1000” described above.
, The correction coefficient K6 “+1”, and the correction coefficient K7 “−10” are examples, and it goes without saying that arbitrary values can be set. In addition, the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _m
Needless to say, the correction of _ax is not limited to addition and subtraction, and various operations such as integration and division can be combined.

<<10th Embodiment>>
Next, a tenth embodiment of the invention will be described. The tenth embodiment has the same configuration as the above-described third embodiment, except for the following differences. That is, in the tenth embodiment, the correction coefficient K8 is stored in the lens memory 38 of the lens barrel 3, and the lens controller 37 uses the correction coefficient K8 stored in the lens memory 38 to perform the minimum image plane movement. The third embodiment described above in that the coefficient K _min is corrected and transmitted to the camera body 2, and the lens control unit 37 and the camera control unit 21 perform the backlash reduction control using the corrected minimum image plane movement coefficient K _min. It has the same configuration except that the configuration is different.

That is, as described above, in the third embodiment, the lens control unit 37 causes the camera control unit 21 to operate.
To the minimum image plane movement coefficient K _min and the backlash amount G (steps S201 and S202 in FIG. 11).
The camera controller 21 uses the minimum image plane movement coefficient K _min and the backlash amount G to shift the image plane movement amount I _G.
To calculate. Then, when “image plane movement amount I _G ”≦“predetermined image plane movement amount I _P ”is satisfied, it is determined that the backlash reduction is “unnecessary”, and control is performed not to perform the backlash reduction drive during focusing drive. Moving amount I
_When “ _{G 2} ”>“predetermined image plane movement amount I _P ”is satisfied, it is determined that the backlash is “necessary”, and control is performed to perform the backlash reduction drive during focusing drive.

However, on the other hand, when the minimum image plane movement coefficient K _min varies due to manufacturing errors during mass production of the lens barrel 3 (see FIG. 23), or the mechanical mechanism of the lens barrel 3 changes over time (lens driving). If the minimum image plane movement coefficient K _min changes due to wear of gears, wear of a member that holds the lens, or the like), it may be impossible to perform suitable backlash reduction driving. Therefore, in the present embodiment, the correction coefficient K8 considering the variation and change of the minimum image plane movement coefficient K _min is set in the lens memory 38.
Then, the lens controller 37 uses the correction coefficient K8 to correct the minimum image plane movement coefficient K _min to a value larger than that before correction, and transmits the corrected value to the camera body 2.

For example, in the present embodiment, the value "100" is set as the minimum image plane movement coefficient K _min ,
When the value “1.1” is stored in the lens memory 38 as the correction coefficient K8, the lens control unit 37 causes the minimum image plane movement coefficient K _min (“100”) stored in the lens memory 38.
And the correction coefficient K8 (“1.1”), the minimum image plane movement coefficient K _min is corrected (100×
1.1=110) and set the corrected minimum image plane movement coefficient K _min (“110”) to the camera body 2.
Send to. Then, the camera control unit 21 corrects the corrected minimum image plane movement coefficient K _min (“110
)) and the amount of backlash G, the image plane movement amount I _G is calculated, and when “image plane movement amount I _G ”≦“predetermined image plane movement amount I _P ”is satisfied, it is determined that the backlash reduction is “unnecessary”. When the "image plane movement amount I _G ">"predetermined image plane movement amount I _P "is established by performing control so as not to perform the backlash reduction drive during focusing drive, the backlash reduction"
It is determined that "required", and control is performed to perform backlash reduction drive during focus drive.

Thus, in the present embodiment, the correction by using a coefficient K8, using uncorrected minimum image plane shift factor K _min ( "100") the minimum image plane shift factor is greater than K _min ( "110") Determine whether or not play is needed. Therefore, the minimum image plane movement coefficient before correction K _min (“100”)
It becomes easier to judge that the backlash is “unnecessary” than when using, and excessive backlash driving can be suppressed even when the minimum image plane movement coefficient K _min changes due to manufacturing error, aging, or the like. It is possible to speed up the contrast AF. Also, the appearance of the through image can be improved.

For example, it is preferable to set the correction coefficient K8 so as to satisfy the following conditional expression in consideration of manufacturing error, change over time, and the like.
Minimum image plane movement coefficient before correction K _min ×1.2 ≧Minimum image plane movement coefficient K _min after correction>
Minimum image plane movement coefficient before correction K _min
Further, the correction coefficient K8 can be set to satisfy the following conditional expression, for example.
1.2 ≧ K8> 1
Further, in the present embodiment, the correction coefficient K9 for correcting the maximum image plane movement coefficient K _max is stored in the lens memory 38 as well as the correction coefficient K8 for correcting the minimum image plane movement coefficient K _min , and the lens The control unit 37 corrects the maximum image plane movement coefficient K _max using the correction coefficient K9 and sends it to the camera body 2, but detailed description thereof is omitted.

<<11th Embodiment>>
Next, an eleventh embodiment of the present invention will be described. The eleventh embodiment has the same configuration as the above-described fourth embodiment, except for the following differences. That is, in the above-described fourth embodiment, an example has been described in which the silent image control (clip operation) is performed using the minimum image plane movement coefficient K _min stored in the lens memory 38. On the other hand, in the eleventh embodiment, the correction coefficient K10 is stored in the lens memory 38 of the lens barrel 3, and the lens controller 37 uses the correction coefficient K10 stored in the lens memory 38 to calculate the minimum image. Surface movement coefficient K
_Min is corrected and transmitted to the camera body, and the lens control unit 37 and the camera control unit 21 perform silent control using the corrected minimum image plane movement coefficient K _min. It differs from the form.

As described above, in the fourth embodiment, the lens control unit 37 instructs the camera control unit 21 to move the current image plane movement coefficient K _cur , the minimum image plane movement coefficient K _min , the maximum image plane movement coefficient K _max , and the silent lower limit lens movement. The speed V0b is transmitted (see step S401 in FIG. 14), and the camera control unit 21 calculates the silent lower limit image plane moving speed V0b_max (see step S402 in FIG. 14). Then, the camera control unit 21 determines that the clipping operation is “permitted” when the image plane moving speed for focus detection V1a×Kc>the lower silent image plane moving speed V0b_max is satisfied, and the image plane moving speed for focus detection V1a× When Kc<quiet noise lower limit image plane moving speed V0b_max is satisfied, the clip operation is determined to be “prohibited”.

However, when the minimum image plane movement coefficient K _min varies due to manufacturing errors (see FIG. 23) during mass production of the lens barrel 3, or when the mechanical mechanism of the lens barrel 3 changes with time (of the gear that drives the lens). When the minimum image plane movement coefficient K _min changes due to wear, wear of a member that holds the lens, or the like), there is a possibility that suitable silent control (clip operation) cannot be performed. Therefore, in the present embodiment, the correction coefficient K10 in consideration of the variation and change in the minimum image plane movement coefficient K _min is stored in the lens memory 38. The lens control unit 37 uses the correction coefficient K10 to correct the minimum image plane movement coefficient K _min so as to have a smaller value than before correction, and then transmits the corrected value to the camera body.

For example, in the present embodiment, when the value “100” is stored as the minimum image plane movement coefficient K _{min and} the value “1.1” is stored as the correction coefficient K10 in the lens memory 38, the lens control unit 37 Minimum image plane movement coefficient K _min (“100”) stored in the memory 38
And the correction coefficient K10 (“1.1”), the minimum image plane movement coefficient K _min is corrected (100
X1.1=110), and the corrected minimum image plane movement coefficient K _min (“110”) is transmitted to the camera body 2. Then, the camera control unit 21 corrects the corrected minimum image plane movement coefficient K _min (“11
0"), the image plane moving speed for focus detection V1a×Kc<the silent lower limit image plane moving speed V
It is determined whether 0b_max is established.

In this embodiment, by using the correction coefficient K10, the minimum image plane movement coefficient K _mi before correction is used.
_{Using the} minimum image plane movement coefficient K _min (“110”) larger than _n (“100”), it is determined whether or not the image plane movement velocity V1a×Kc for focus detection <quiet lower limit image plane movement velocity V0b_max holds. Since the determination is made, it is more difficult to determine the clip operation “prohibition” than when the minimum image plane movement coefficient K _min (“100”) before correction is used. Therefore, even if the minimum image plane movement coefficient K _min changes due to manufacturing error, change over time, or the like, a reliable clipping operation is suppressed, and silent control can be reliably realized, which is a particular effect.

For example, it is preferable to set the correction coefficient K10 so as to satisfy the following conditional expression in consideration of manufacturing error, change with time, and the like.
Minimum image plane movement coefficient before correction Kmin×1.2 ≧Minimum image plane movement coefficient Kmin after correction
> The minimum image plane movement coefficient Kmin before correction
Further, the correction coefficient K10 can be set to satisfy the following conditional expression, for example.
1.2 ≧ K10> 1

Further, in the present embodiment, similarly to the correction coefficient K10 for correcting the minimum image plane movement coefficient K _min , the correction coefficient K11 for correcting the maximum image plane movement coefficient K _max is stored in the lens memory 38 and the lens The control unit 37 uses the correction coefficient K11 to correct the maximum image plane movement coefficient K _max and sends it to the camera body 2, but a detailed description thereof will be omitted.

The above-described embodiments are described to facilitate understanding of the present invention, and are not described to limit the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents within the technical scope of the present invention. Further, the above-described respective embodiments can be appropriately combined and used.

For example, in the above-described first embodiment, when the minimum image plane movement coefficient K _min and the corrected minimum image plane movement coefficient K _{min_x} are transmitted to the camera control unit 21, they are alternately transmitted. It is not particularly limited to such an embodiment. For example, the minimum image plane movement coefficient K
_It is also _possible to _adopt a mode in which the operation of transmitting _min twice consecutively and then transmitting the corrected minimum image plane movement coefficient K _{min — x} twice consecutively is repeated, or the minimum image plane movement coefficient K _mi
It is also possible to _adopt a mode in which the operation of transmitting _n twice consecutively and then transmitting the corrected minimum image plane movement coefficient K _{min — x} once is repeated. Further, in this case, the maximum image plane movement coefficient K _max and the corrected maximum image plane movement coefficient K _{max — x} can be the same.

Further, in the above-described first embodiment, the corrected minimum image plane movement coefficient K _{min — x} is _set to, for example, 2
In the case of the above-described aspect, when transmitting the minimum image plane movement coefficient K _min and the corrected minimum image plane movement coefficient K _{min — x} of 2 or more to the camera control unit 21, the minimum image plane movement coefficient K _min is transmitted. ,
Next, the operation of sequentially transmitting the corrected minimum image plane movement coefficient K _{min — x} of 2 or more may be repeated.

Further, in the above-described embodiment, as the mechanism for camera shake correction, the configuration in which the lens barrel 3 is provided with the camera shake correction lens 34 is illustrated, but the image sensor 22 is configured to be movable in the direction orthogonal to the optical axis L1. Thus, the camera shake correction may be performed.

Further, the camera 1 of the above-described embodiment is not particularly limited, and for example, as shown in FIG. 24, the present invention may be applied to an interchangeable lens type mirrorless camera 1a. In the example shown in FIG. 24, the camera body 2a successively sends out the picked-up images picked up by the image pickup element 22 to the camera control unit 21, and the electronic viewfinder (EVF) of the observation optical system via the liquid crystal drive circuit 25.
26 is displayed. In this case, the camera control unit 21 detects the focus adjustment state of the photographing optical system by the contrast detection method by, for example, reading the output of the image sensor 22 and calculating the focus evaluation value based on the read output. be able to. The present invention may be applied to other optical devices such as a digital video camera, a lens-integrated digital camera, and a camera for a mobile phone.

DESCRIPTION OF SYMBOLS 1... Digital camera 2... Camera main body 21... Camera control part 22... Imaging element 29... Camera transmission/reception part 291... Camera side 1st communication part 292... Camera side 2nd communication part 3... Lens barrel 32... Zoom lens lens 321... Zoom lens drive motor 33... Focus lens 331... Focus lens drive motor 37... Lens control unit 38... Lens memory 39... Lens transmission/reception unit 381... Lens side first communication unit 382... Lens side second communication unit

Claims (1)

An interchangeable lens that can be attached to the camera body,
An optical system including a focus adjustment lens,
A drive unit for driving the focus adjustment lens in the optical axis direction of the optical system;
A first value at the lens position of the focus adjustment lens of an image plane movement coefficient that changes depending on the position of the focus adjustment lens and corresponds to the amount of movement of the image plane with respect to the movement amount of the focus adjustment lens;
A transmission unit that transmits information including a second value to the camera body,
The transmission unit sets the maximum value of the image plane movement coefficient that maximizes the movement amount of the image plane with respect to the movement amount of the focus adjustment lens within the drive range of the focus adjustment lens by the drive unit as the second value. the first information, and the interchangeable lens that sends the second information to the second value smaller than said maximum value.

Images