JP6459409B2 - Camera body, interchangeable lens, and imaging device - Google Patents

Description

  The present invention relates to a camera body and an imaging apparatus.

  Conventionally, a technique for detecting a focus state of an optical system by calculating an evaluation value related to contrast by the optical system while driving the focus optical system at a predetermined driving speed in the optical axis direction is known (for example, Patent Document 1).

JP 2010-139666 A

  The problem to be solved by the present invention is to provide a camera body and an imaging apparatus capable of suitably detecting a focus adjustment state of an optical system.

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

  [1] A camera body according to a first aspect of the present invention can be attached to an interchangeable lens, and includes a first image plane movement coefficient that changes from the interchangeable lens according to a position on an optical axis of a focus optical system, and the first When it is determined that the receiving unit that receives a second image plane movement coefficient equal to or smaller than the value of one image plane movement coefficient and the focus optical system is within a predetermined range, an abnormality occurs when the second image plane movement coefficient changes. And a determination unit that does not determine that the focus optical system is abnormal when the second image plane movement coefficient changes when it is determined that the focus optical system is not within the predetermined range. .

  [2] In the invention according to the camera body, the receiving unit receives a third image plane movement coefficient that is equal to or greater than a value of the first image plane movement coefficient, and the determination unit is configured such that the focus optical system is within the predetermined range. If the third image plane movement coefficient is changed, it is determined that the abnormality is detected when the third image plane movement coefficient is changed. If the focus optical system is not within the predetermined range, it is abnormal when the third image plane movement coefficient is changed. It can be configured not to judge.

  [3] In the invention according to the camera body, the reception unit receives predetermined information from the interchangeable lens, and the determination unit uses the predetermined information received by the reception unit to cause the focus optical system to It can be configured to determine whether it is within range.

  [4] A camera body according to a second aspect of the present invention is a camera body that can be attached to an interchangeable lens, and is a first image plane movement coefficient that varies depending on a position on the optical axis of the focus optical system from the interchangeable lens. A second image plane movement coefficient equal to or smaller than the value of the first image plane movement coefficient, a third image plane movement coefficient equal to or greater than the value of the first image plane movement coefficient, and information regarding the position of the focus optical system; The focus optical system is within the drive range using the receiving unit that receives information related to the drive range of the focus optical system, the information related to the position of the focus optical system, and the information related to the drive range of the focus optical system. And a determination unit that determines that an abnormality occurs when at least one of the second image plane movement coefficient and the third image plane movement coefficient fluctuates.

  [5] In the invention according to the camera body, the determination unit determines that the focus optical system is within a drive range using information regarding the position of the focus optical system and information regarding a drive range of the focus optical system. When not, it can be configured not to determine that it is abnormal even if at least one of the second image plane movement coefficient and the third image plane movement coefficient varies.

  [6] In the invention according to the camera body, the receiving unit receives information on the position of the variable power optical system, and the determination unit uses the information on the position of the variable power optical system, When it is determined that the lens is moving, even if at least one of the second image plane movement coefficient and the third image plane movement coefficient fluctuates, it is not determined that it is abnormal.

  [7] In the invention relating to the camera body, when the determination unit does not determine that the focus optical system is within the drive range, a first drive control signal for driving the focus optical system to the inside of the drive range is provided. It can comprise so that it may further have a control part to generate and a transmission part which transmits the drive control signal to the interchangeable lens.

  [8] In the invention according to the camera body, the camera body further includes an arithmetic unit that calculates an in-focus position of the focus optical system using a contrast evaluation value, and the control unit causes the determination unit to determine whether the focus optical system is A second drive control signal for driving the focus optical system to the in-focus position is generated when it is determined that it is within the drive range, and the second drive when it is not determined by the determination unit that it is within the drive range. It can be configured not to generate the control signal.

  [9] A camera body according to a third aspect of the present invention includes, from an interchangeable lens capable of setting a drive range of a focus optical system, information on the drive range, position information on the focus optical system, and a variable power optical system. And a receiving unit that receives a specific image plane movement coefficient that changes according to the focal length of the zoom optical system, and the exchange when the focal length of the zoom optical system has not changed. A control unit that executes a predetermined operation when the specific image plane movement coefficient received from the lens changes, and the control unit has a current lens position of the focus optical system outside the drive range. When the specific image plane movement coefficient is changed, the predetermined operation is not executed even when the focal length of the variable magnification optical system is not changed.

  [10] A camera body according to a fourth aspect of the present invention includes an information on the driving range, position information on the focusing optical system, and a variable magnification optical system, from an interchangeable lens capable of setting the driving range of the focusing optical system. A communication unit that receives a focal length of the zoom lens and a specific image plane movement coefficient that changes in accordance with the focal length of the zoom optical system, and a control unit that controls driving of the focus optical system. A first driving operation for driving the focus optical system to the drive range when the current lens position of the focus optical system is outside the drive range; When the current lens position is inside the drive range, a second drive operation different from the first drive operation is executed.

  [11] In the invention according to the camera body, the control unit may perform a focal length of the variable magnification optical system when the specific image plane movement coefficient changes during the second drive operation. If the specific image plane movement coefficient changes when the predetermined operation is executed and the first drive operation is executed, the focal length of the variable magnification optical system changes. Even when it is not, it can be configured not to execute the predetermined operation.

  [12] A camera body according to a fifth aspect of the present invention includes an information on the drive range, position information on the focus optical system, and a variable power optical system from an interchangeable lens capable of setting the drive range of the focus optical system. And a communication unit that receives a specific image plane movement coefficient that changes in accordance with the focal length of the zoom optical system, and the exchange when the focal length of the zoom optical system has not changed. A control unit that performs a predetermined operation when the specific image plane movement coefficient received from the lens changes, and the control unit, when the focal length of the zoom optical system has not changed, Even when the specific image plane movement coefficient changes, the predetermined operation is not executed when the driving range is changed.

  [13] In the invention according to the camera body, when the drive range is changed, the control unit does not execute the predetermined operation until a predetermined time elapses from the time when the drive range is changed. It can be constituted as follows.

  [14] In the invention according to the camera body, the control unit detects the image plane movement coefficient at each lens position of the focus optical system while driving the focus optical system over the entire drive range. When an image plane movement coefficient equal to the specific image plane movement coefficient cannot be detected, a predetermined operation can be performed.

  [15] An imaging apparatus according to the present invention includes the camera body.

FIG. 1 is a perspective view showing a camera according to the first embodiment. FIG. 2 is a main part configuration diagram showing the camera according to the first embodiment. FIG. 3 is an external view of the lens barrel 3 according to the present embodiment. FIG. 4 is a diagram illustrating an example of a driveable range of the focus lens. FIG. 5 is a diagram for explaining an example of exchange of information between the lens barrel and the camera body. FIG. 6 is a table showing the relationship between the lens position (focal length) of the zoom lens, the lens position (shooting distance) of the focus lens, and the image plane movement coefficient K. It is a figure for demonstrating the minimum image plane movement coefficient _Kmin and the maximum image plane movement coefficient _Kmax according to the driveable range. FIG. 8 is a diagram for explaining an example of a focus detection method using a contrast detection method. FIG. 9 is a schematic diagram illustrating details of the connection units 202 and 302. FIG. 10 is a diagram illustrating an example of command data communication. FIG. 11 is a diagram illustrating an example of hotline communication. FIG. 12 is a flowchart showing lens information transmission processing according to the first embodiment. FIG. 13 is a diagram illustrating an example of the relationship between the lens position of the focus lens, the image plane movement coefficient, and the drivable range. FIG. 14 is a diagram illustrating another example of the relationship between the lens position of the focus lens, the image plane movement coefficient, and the driveable range. FIG. 15 is a flowchart illustrating an operation example of the present embodiment. FIG. 16 is a flowchart showing the abnormality determination process in the first embodiment. FIG. 17 is a flowchart showing lens information transmission processing according to the second embodiment. FIG. 18 is a flowchart showing the abnormality determination process in the second embodiment. FIG. 19 is a flowchart showing the abnormality determination process in the third embodiment. FIG. 20 is a flowchart showing the abnormality determination process in the fourth embodiment. FIG. 21 is a diagram illustrating a driving range of the focus lens 33.

<< First Embodiment >>
FIG. 1 is a perspective view showing a single-lens reflex digital camera 1 of the present embodiment. Moreover, FIG. 2 is a principal part block diagram which shows the camera 1 of this embodiment. A digital camera 1 of the present embodiment (hereinafter simply referred to as a camera 1) includes a camera body 2 and a lens barrel 3, and the camera body 2 and the lens barrel 3 are detachably coupled.

  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 includes a photographing optical system including lenses 31, 32, 33, 34 and a diaphragm 35.

  The lens 33 is a focus lens, and can move in the optical axis L1 direction to adjust the focus state of the photographing optical system. The focus lens 33 is movably provided along the optical axis L 1 of the lens barrel 3, and its position is adjusted by the focus lens driving motor 331 while its position is detected by the focus lens encoder 332.

  The lens 32 is a zoom lens, and can adjust the focal length of the photographing optical system by moving in the direction of the optical axis L1. Similarly to the focus lens 33 described above, the position of the zoom lens 32 is adjusted by the zoom lens driving motor 321 while the position thereof is 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 operating a zoom ring (not shown) provided on the lens barrel 3.

  The diaphragm 35 is configured such that the aperture diameter around the optical axis L1 can be adjusted in order to limit the amount of light flux that passes through the photographing optical system and reaches the image sensor 22 and adjust the amount of blur. The adjustment of the aperture diameter by the diaphragm 35 is performed, 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 36. Further, the set aperture diameter is input from the camera control unit 21 to the lens control unit 36 by a manual operation by the operation unit 28 provided in the camera body 2. The aperture diameter of the aperture 35 is detected by an aperture sensor (not shown), and the lens controller 36 recognizes the current aperture diameter.

  In the lens barrel 3 according to the present embodiment, the driveable range of the focus lens 33 can be set. In the present embodiment, as shown in FIGS. 2 and 3, the lens barrel 3 is provided with a focus limit switch 38 for setting a driveable range, and the user operates the focus limit switch 38, By selecting the focus limit mode, the driveable range of the focus lens 33 can be selected. FIG. 3 is an external view of the lens barrel 3 according to this embodiment.

  FIG. 4 is a diagram showing an example of a drivable range that can be set in the present embodiment, and a range in which the focus lens 33 cannot be driven is shown in gray. In the present embodiment, as shown in FIGS. 4A to 4C, three focus limit modes of “FULL mode”, “near limit mode”, and “infinity limit mode” can be set. It has become.

The “FULL mode” is a mode for detecting the in-focus position within the range from the infinitely far end soft limit SL _IP to the very close end soft limit SL _NP . As shown in FIG. A range from the lens position of the soft limit SL _{IP to} the lens position of the closest soft limit SL _NP is set as the drivable range Rf1. However, depending on the driving speed and deceleration characteristics of the focus lens 33, it may not be possible to stop at the lens position of the infinity end soft limit SL _{IP or} the lens position of the closest end soft limit SL _NP . In this case, as shown in FIG. 4 (A), the lens position closer to the infinity side than the infinity end soft limit SL _IP (the end on the infinity end soft limit SL _IP side of the region painted in gray) is the closest distance. The range up to the lens position closer to the end soft limit SL _NP (the end on the close end soft limit SL _NP side of the area painted in gray) is set as the drivable range Rf1.

Further, the “close-side limit mode” is a mode for detecting the in-focus position in the range from the infinity end soft limit SL _IP to the close-side soft limit SL _NS . As shown in FIG. A range from the lens position of the far-end soft limit SL _{IP to} the lens position of the closest soft limit SL _NS is set as the drivable range Rf2. Incidentally, as shown in FIG. 4 (B), from an infinite far soft limit SL _IP lens position infinity side than the (infinite far soft limit SL _IP end of the region filled with gray), close side software The range up to the lens position closer to the limit SL _NS (the end on the closest soft limit SL _NS side of the area painted in gray) may be set as the drivable range Rf2.
Furthermore, the “infinity side limit mode” is a mode for detecting the in-focus position in the range from the infinity side soft limit SL _IS to the closest end soft limit SL _NP , as shown in FIG. A range from the lens position of the infinity side soft limit SL _{IS to} the lens position of the closest soft limit SL _NP is set as the driveable range Rf3. Incidentally, as shown in FIG. 4 (C), from the infinity side software limit SL lens position infinity side than the _IS (infinity side software limit SL _IS end of the region filled with gray), the closest end The range up to the lens position closer to the soft limit SL _NP (the end on the near end soft limit SL _NP side of the area painted in gray) may be set as the drivable range Rf3.

  In the present embodiment, the “FULL mode” is set by setting the focus limit switch 38 to “FULL” shown in FIG. 3, and the “close-side limit mode” is set by matching “limit 1” shown in FIG. 3. Is set, and the “infinity side limit mode” is set by matching with “limit 2” shown in FIG.

When one of the focus limit modes is selected by the user, information on the focus limit mode selected by the user is transmitted from the lens barrel 3 to the camera body 2. The information on the focus limit mode is stored in the lens memory 37 for each focus limit mode. For example, “FULL mode” is stored so that the lens position of the infinity end soft limit SL _{IP and} the lens position of the near end soft limit SL _NP correspond to each other. The lens position of the limit SL _{IP and} the lens position of the near side soft limit SL _NS are stored so as to correspond to each other, and the lens position of the “infinity side limit mode” and the infinity side soft limit SL _IS and the close side are stored. The lens position of the end soft limit SL _NP is stored so as to correspond.

For example, when the “FULL mode” shown in FIG. 4A is set by the focus limit switch 38, the lens control unit 36 becomes an infinite distance that is a reference for the limit position (end) of the drivable range Rf1. The end soft limit SL _IP and the nearest end soft limit SL _NP are transmitted to the camera body 2 as information on the focus limit mode. In addition, when the “closest limit mode” shown in FIG. 4B is set by the focus limit switch 38, the lens control unit 36 uses the infinitely far end software as a reference for the limit position of the drivable range Rf2. The limit SL _IP and the near side soft limit SL _NS are transmitted to the camera body 2 as information on the focus limit mode. Similarly, when the “infinity limit mode” shown in FIG. 4C is set by the focus limit switch 38, the lens control unit 36 becomes the reference of the limit position of the drivable range Rf3. The side soft limit SL _IS and the closest soft limit SL _NP are transmitted to the camera body 2 as information on the focus limit mode.

In the present embodiment, for example, information indicating whether or not the lens barrel 3 is a lens barrel capable of changing the drivable range and information on the focus limit mode described above are stored in the lens memory 37. ing. Then, the lens control unit 36 includes information indicating whether or not the lens barrel 3 is a lens barrel capable of changing the drivable range, and information on the focus limit mode selected by the user (in the case of “FULL mode”). Is the lens position of the infinity end soft limit SL _IP, the lens position of the near end soft limit SL _NP , and the lens position of the infinity end soft limit SL _{IP in} the case of the “close side limit mode”, and the close side software The lens position of the limit SL _{NS, or} the lens position of the infinity side soft limit SL _{IS and} the lens position of the closest soft limit SL _NP in the case of “infinity side limit mode” is used as the focus limit information. It can be periodically transmitted from the lens barrel 3 to the camera body 2.

Further, as shown in FIG. 5, in addition to the focus limit information, information on the focus lens position and the zoom lens position is periodically transmitted from the lens barrel 3 to the camera body 2. Further, in the present embodiment, a current position image plane movement coefficient K _cur , a minimum image plane movement coefficient K _min , and a maximum image plane movement coefficient K _{max described later} are also transmitted from the lens barrel 3 to the camera body 2. On the other hand, in the camera body 2, the lens driving amount of the focus lens 33 is calculated based on the focus limit information and the position information of the focus lens 33, and the calculated lens driving amount is transmitted to the lens barrel 3. FIG. 5 is a diagram for explaining an example of information exchange between the lens barrel 3 and the camera body 2.

  The lens memory 37 stores an image plane movement coefficient K. The image plane movement coefficient K is a value indicating the correspondence between the driving amount of the focus lens 33 and the moving amount of the image plane, and is, for example, the ratio between the driving amount of the focus lens 33 and the moving amount of the image plane.

In the present embodiment, the image plane movement coefficient is obtained by, for example, the following equation (1). As the image plane movement coefficient K decreases, the amount of movement of the image plane accompanying the driving of the focus lens 33 increases.
Image plane movement coefficient K = (drive amount of focus lens 33 / movement amount of image plane) (1)
Further, in the camera 1 of the present embodiment, even when the driving amount of the focus lens 33 is the same, the moving amount of the image plane varies depending on the lens position of the focus lens 33. Similarly, even when the driving amount of the focus lens 33 is the same, the moving amount of the image plane varies depending on the lens position of the zoom lens 32, that is, the focal length. That is, the image plane movement coefficient K changes in accordance with the lens position in the optical axis direction of the focus lens 33 and further in accordance with the lens position in the optical axis direction of the zoom lens 32. In this embodiment, the lens control unit 36 stores an 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 also be defined as, for example, an image plane movement coefficient K = (image plane movement amount / focus lens 33 drive amount). In this case, as the image plane movement coefficient K increases, the amount of movement of the image plane accompanying the driving of the focus lens 33 increases.

  Here, FIG. 6 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. In the table shown in FIG. 6, 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 infinite. The image plane movement coefficient K corresponding to each lens position is stored in nine areas “D1” to “D9” in order from the end toward the closest end. For example, when the lens position (focal length) of the zoom lens 32 is “f1” and the lens position (shooting distance) of the focus lens 33 is “D1”, the image plane movement coefficient K is “K11”. The table shown in FIG. 6 exemplifies a mode in which each lens driving area is divided into nine areas, but the number is not particularly limited and can be arbitrarily set.

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. 6, “K11” = “100”, “K12” = “200”, “K13” = “300”, “K14” = “400”, “K15” = “500”, “K16” = When “600”, “K17” = “700”, “K18” = “800”, “K19” = “900”, the minimum value “K11” = “100” is the minimum image plane movement coefficient. K _min , and the maximum value “K19” = “900” is the maximum image plane movement coefficient K _max .
The minimum image plane movement coefficient K _min usually changes according to the current lens position of the zoom lens 32. Further, the minimum image plane movement coefficient K _min is generally 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. That is, the minimum image plane movement coefficient K _min is a fixed value (fixed value) that is normally determined according to the lens position (focal length) of the zoom lens 32 and depends on the lens position (shooting distance) of the focus lens 33. Not a value.

For example, in FIG. 6, “K11”, “K21”, “K31”, “K41”, “K52”, “K62”, “K72”, “K82”, and “K91” shown in gray are the zoom lens 32. The minimum image plane movement coefficient K _min indicating a minimum value among the image plane movement coefficients K at the respective lens positions (focal lengths). That is, when the lens position (focal length) of the zoom lens 32 is “f1”, the lens position (shooting distance) of the focus lens 33 among “D1” to “D9” is “D1”. “K11” which is the image plane movement coefficient K is the minimum image plane movement coefficient K _min indicating the minimum value. Accordingly, “K11”, which is the image plane movement coefficient K when the lens position (shooting distance) of the focus lens 33 is “D1”, has a lens position (shooting distance) of the focus lens 33 of “D1” to “D9”. Is the smallest value among the image plane movement coefficients K “K11” to “K19”. Similarly, when the lens position (focal length) of the zoom lens 32 is “f2”, the image plane movement coefficient K is “when the lens position (shooting distance) of the focus lens 33 is“ D1 ”. “K21” indicates the smallest value among “K21” to “K29”, which are image plane movement coefficients K when “K1” is “D1” to “D9”. That is, “K21” is the minimum image plane movement coefficient K _min . Similarly, even when each lens position (focal length) of the zoom lens 32 is “f3” to “f9”, “K31”, “K41”, “K52”, “K62”, “K” shown in gray “K72”, “K82”, and “K91” are the minimum image plane movement coefficient K _min .

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 usually changes according to the current lens position of the zoom lens 32. Further, the maximum image plane movement coefficient _Kmax is generally 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. 6, hatched “K19”, “K29”, “K39”, “K49”, “K59”, “K69”, “K79”, “K89”, “K99” This is the maximum image plane movement coefficient K _max indicating the maximum value among the image plane movement coefficients K at each lens position (focal length) of the lens 32.

Thus, as shown in FIG. 6, the lens memory 37 includes an 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 of the 32 lens positions (focal length), the minimum image plane movement coefficient K _min indicating the minimum value of the image plane movement coefficient K, and for each lens position (focal length) of the zoom lens 32, the image plane movement coefficient. A maximum image plane movement coefficient K _max indicating the maximum value of K is stored.

The lens memory 37 is smallest in place of the minimum image plane shift factor K _min indicating the value, the minimum image plane shift factor K is a value in the vicinity of the minimum image plane shift factor K _min of the image plane shift factor K _min ′ may be stored in the lens memory 37. For example, when the value of the minimum image plane movement coefficient K _min is a large number of digits of 102.345, 100, which is a value in the vicinity of 102.345, may be stored as the minimum image plane movement coefficient K _min ′. it can. When 100 (minimum image plane movement coefficient K _min ′) is stored in the lens memory 37, the memory capacity of the memory is larger than when 102.345 (minimum image plane movement coefficient K _min ) is stored in the lens memory 37. This is because it can be saved and the volume of transmission data can be suppressed during transmission to the camera body 2.
For example, when the value of the minimum image plane movement coefficient K _min is 100, 100 is considered in consideration of stability of control such as backlash control, silent control (clip operation), lens speed control, and the like, which will be described later. 98, which is a value in the vicinity of, can be stored as the minimum image plane movement coefficient K _min ′. For example, when considering the stability of control, it is preferable to set the minimum image plane movement coefficient K _min ′ within the range of 80% to 120% of the actual value (minimum image plane movement coefficient K _min ).

In the present embodiment, the lens memory 37 stores a minimum image plane movement coefficient K _min and a maximum image plane movement coefficient K _max corresponding to each driveable range. Here, FIG. 7 is a diagram for explaining the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max according to the driveable range. 7A shows the image plane movement at each lens position of the focus lens 33 within the drivable range Rf1 set when the “FULL mode” is selected as shown in FIG. 4A. The coefficient is shown. FIG. 7B shows an image at each lens position of the focus lens 33 within the drivable range Rf2 that is set when the “closest side restriction mode” is selected as shown in FIG. 4B. The surface movement coefficient is shown. FIG. 7C shows the focus lens 33 at each lens position within the drivable range Rf3 set when the “infinity limit mode” is selected as shown in FIG. The image plane movement coefficient is shown.

For example, as shown in FIG. 7A, when the “FULL mode” is set, the drivable range Rf1 is determined from the lens position of the infinity end soft limit SL _IP to the closest end soft limit SL _NP. This is the range up to the lens position. In this case, similarly to the example shown in FIG. 6, the drive region of the focus lens 33 can be divided into nine regions “D1” to “D9”. Therefore, the lens memory 37 stores “K11” to “K19” as the minimum image plane movement coefficient K _min corresponding to the driveable range Rf1 when the lens position (focal length) of the zoom lens 32 is “f1”. The smallest “K11” is stored, and the largest “K19” among “K11” to “K19” is stored as the maximum image plane movement coefficient K _max corresponding to the driveable range Rf1.

On the other hand, as shown in FIG. 7B, when the “close-side limit mode” is selected, the drivable range Rf2 is determined from the lens position of the infinity end soft limit SL _IP to the close-side soft limit SL. The range is up to _NS . In this case, the drive region of the focus lens 33 can be divided into five regions “D1” to “D5”. Therefore, the lens memory 37 has “K11” to “K15” as the minimum image plane movement coefficient K _min corresponding to the drivable range Rf2 when the lens position (focal length) of the zoom lens 32 is “f1”. The smallest “K11” is stored, and the largest “K15” among “K11” to “K15” is stored as the maximum image plane movement coefficient K _max corresponding to the driveable range Rf2.

Similarly, as shown in FIG. 7C, when the “infinity side limit mode” is selected, the drivable range Rf3 is from the lens position of the infinity side soft limit SL _IS to the near end. The range is up to the soft limit SL _NP . In this case, the drive region of the focus lens 33 can be divided into six regions “D4” to “D9”. Therefore, the lens memory 37 has “K14” to “K19” as the minimum image plane movement coefficient K _min corresponding to the driveable range Rf3 when the lens position (focal length) of the zoom lens 32 is “f1”. The smallest “K14” is stored, and the largest “K19” among “K14” to “K19” is stored as the maximum image plane movement coefficient K _max corresponding to the driveable range Rf3.

Note that the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max according to the driveable range are normally fixed values (constant values) determined according to the lens position (focal length) of the zoom lens 32, The value does not depend on the lens position (shooting distance) of the focus lens 33.

  Next, the camera body 2 will be described. The camera body 2 includes a mirror system 220 for guiding the light beam 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 about a rotation axis 223 by a predetermined angle between the observation position and the imaging position of the subject, and the quick return mirror 221 that is pivotally supported by the quick return mirror 221. And a sub mirror 222 that rotates in accordance with the rotation. In FIG. 2, the state where the mirror system 220 is at the observation position of the subject is indicated by a solid line, and the state where 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 on the optical path of the optical axis L1 in a state where the subject is at the observation position of the subject, while rotating so as to be retracted from the optical path of the optical axis L1 in a state where the mirror system 220 is at the imaging position of the subject.

  The quick return mirror 221 is composed of a half mirror, and in a state where the subject is at the observation position of the subject, the quick return mirror 221 reflects a part of the luminous flux (optical axis L1, L3) of the luminous flux (optical axis L1) from the subject. Then, the light is guided to the finder 235 and the photometric sensor 237, and a part of the light beam (optical axis L4) is transmitted to the sub mirror 222. On the other hand, the sub mirror 222 is constituted by a total reflection mirror, and guides the light beam (optical axis L4) transmitted through the quick return mirror 221 to the focus detection module 261.

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

  The light beam (optical axis L2) from the subject reflected by the quick return mirror 221 forms an image on a focusing screen 231 disposed on a surface optically equivalent to the imaging element 22, and the pentaprism 233 and the eyepiece 234 are formed. It is possible to observe through. At this time, the transmissive liquid crystal display 232 superimposes and displays a focus detection area mark on the subject image on the focusing screen 231, and also relates to shooting such as the shutter speed, aperture value, and number of shots in an area outside the subject image. Display information. As a result, the photographer can observe the subject, its background, and photographing related information through the finder 235 in the photographing preparation state.

  The photometric sensor 237 is composed of a two-dimensional color CCD image sensor or the like, and divides the photographing screen into a plurality of regions and outputs a photometric signal corresponding to the luminance of each region in order to calculate an exposure value at the time of photographing. The signal detected by the photometric sensor 237 is output to the camera control unit 21 and used for automatic exposure control.

  The imaging element 22 is provided on the planned focal plane of the photographing optical system including the lenses 31, 32, 33, and 34 on the optical axis L1 of the light beam from the subject of the camera body 2, and a shutter 23 is provided on the front surface thereof. Is provided. The image pickup element 22 has a plurality of photoelectric conversion elements arranged two-dimensionally, and can be constituted by 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 subjected to image processing by the camera control unit 21 and then recorded in a camera memory 24 which is a recording medium. The camera memory 24 can be either a removable card type memory or a built-in memory.

  The camera control unit 21 detects the focus adjustment state of the photographing optical system by the contrast detection method (hereinafter, referred to as “contrast AF” as appropriate) based on the pixel data read from the image sensor 22. For example, the camera control unit 21 reads the output of the image sensor 22 and calculates a focus evaluation value based on the read output. This focus evaluation value can be obtained, for example, by extracting a high-frequency component of the output from the image sensor 22 using a high-frequency transmission filter. It can also be obtained by extracting high-frequency components 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 36 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 maximum. The focus detection by the contrast detection method is performed in which the position of the focus lens 33 is determined as the focus position. Note that this in-focus position is obtained when, for example, the focus evaluation value is calculated while the focus lens 33 is driven, and the focus evaluation value rises twice and then moves down twice. Can be obtained by performing an operation such as interpolation using the focus evaluation value.

  Here, FIG. 8 is a diagram for explaining an example of a focus detection method using a contrast detection method. In the example shown in FIG. 8, the focus lens 33 is located at P0 shown in FIG. 8. First, the focus lens 33 is driven from P0 to a predetermined scan start position (position P1 in FIG. 8). Initial drive is performed. Then, the focus lens 33 is driven from the scan start position (position P1 in FIG. 8) from the infinity side to the close side, and the focus evaluation value is acquired by the contrast detection method at a predetermined interval. Driving is performed. When the focus lens 33 is moved to the position P2 shown in FIG. 8, the peak position of the focus evaluation value (position P3 in FIG. 8) is detected as the focus position, and the detected focus position is detected. Focusing driving for driving the focus lens 33 is performed up to (position P3 in FIG. 8).

  In 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 the in-focus position cannot be detected properly. This is because as the sampling interval of the focus evaluation value increases, the variation of the focus position increases and the focus accuracy may decrease. 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 in-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 the maximum image plane among the image plane moving speeds at the sampling interval. The focus lens 33 is driven so as to achieve the driving speed. The search control includes, for example, wobbling, a proximity search that searches only the vicinity of a predetermined position (neighbor scan), and a global search that searches the entire drive range of the focus lens 33 (global scan).

  The camera control unit 21 drives the focus lens 33 at a high speed when starting the search control using a half-press of the release switch as a trigger, and starts the search control using a condition other than the half-press of the release switch as a trigger. Alternatively, the focus lens 33 may be driven at a low speed. By controlling in this way, contrast AF can be performed at a high speed when the release switch is half-pressed, and contrast AF can be performed when the release switch is not half-pressed, and the appearance of the through image is favorable. It is.

  Further, the camera control unit 21 may perform control so that the focus lens 33 is driven at high speed in search control in the still image shooting mode, and the focus lens 33 is driven at low speed in search control in the moving image shooting mode. By controlling in this way, contrast AF can be performed at high speed in the still image shooting mode, and contrast AF suitable for the appearance of the moving image can be performed in the moving image shooting mode.

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

  In the present embodiment, focus detection by a phase difference detection method can also be performed. Specifically, the camera body 2 includes a focus detection module 261, and the focus detection module 261 is disposed in the vicinity of the planned focal plane of the imaging optical system and the microlens. It has a pair of line sensors (not shown) in which a plurality of pixels having photoelectric conversion elements are arranged. A pair of image signals can be acquired by receiving a pair of light fluxes passing through a pair of regions having different exit pupils of the focus lens 33 at each pixel arranged in a pair of line sensors. Then, it is possible to perform focus detection by a phase difference detection method of detecting a focus adjustment state by obtaining a phase shift between a pair of image signals acquired by a pair of line sensors by a known correlation calculation.

  The operation unit 28 is an input switch for a photographer to set various operation modes of the camera 1, such as a moving image shooting start switch, and switches between a still image shooting mode / moving image shooting mode and an auto focus mode / manual focus mode. Can be done. Various modes set by the operation unit 28 are sent to the camera control unit 21, and the operation of the entire camera 1 is controlled by the camera control unit 21. The shutter release button includes a first switch SW1 that is turned on when the button is half-pressed and a second switch SW2 that is turned on when the button is fully pressed.

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

  The camera body 2 is provided with a body side mount portion 201 to which the lens barrel 3 is detachably attached. Further, as shown in FIG. 1, a connection portion 202 that protrudes to the inner surface side of the body side mount portion 201 is provided in the vicinity of the body side mount portion 201 (inner surface side of the body side mount portion 201). . The connection portion 202 is provided with a plurality of electrical contacts.

  On the other hand, the lens barrel 3 is an interchangeable lens that can be attached to and detached 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, a connection portion 302 that protrudes to the inner surface side of the lens side mount portion 301 is provided in the vicinity of the lens side mount portion 301 (inner surface side of the lens side mount portion 301). . The connecting portion 302 is provided with a plurality of electrical contacts.

  When the lens barrel 3 is attached to the camera body 2, an electrical contact of the connection portion 202 provided on the body side mount portion 201 and an electrical contact of the connection portion 302 provided on the lens side mount portion 301 are obtained. Electrically and physically connected. Thereby, power supply from the camera body 2 to the lens barrel 3 and data communication between the camera body 2 and the lens barrel 3 can be performed via the connection units 202 and 302.

  FIG. 9 is a schematic diagram showing details of the connecting sections 202 and 302. In FIG. 9, the connection portion 202 is arranged on the right side of the body-side mount portion 201 in accordance with the actual mount structure. That is, the connection part 202 of this embodiment is arrange | positioned in the place deeper than the mount surface of the body side mount part 201 (The place of the right side rather than the body side mount part 201 in FIG. 9). Similarly, the connection portion 302 is disposed on the right side of the lens side mount portion 301 because the connection portion 302 of the present embodiment is disposed at a position protruding from the mount surface of the lens side mount portion 301. 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, so that the camera body 2 and the lens barrel 3 Are connected to each other, the connecting portion 202 and the connecting portion 302 are connected to each other, and the electrical contacts provided in both the connecting portions 202 and 302 are connected to each other.

  As shown in FIG. 9, twelve electrical contacts BP <b> 1 to BP <b> 12 exist in the connection portion 202. Further, twelve electrical contacts LP1 to LP12 corresponding to the twelve electrical contacts on the camera body 2 side exist in the connection portion 302 on the lens 3 side.

  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 supplies an operating voltage to each part in the lens barrel 3 (except for circuits with relatively large power consumption such as the lens drive motors 321 and 331) via the electrical contact BP1 and the electrical contact 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, a voltage value of 3 to 4 V (typically 3 in the middle of this voltage width). Voltage value in the vicinity of 0.5 V). In this case, the current value supplied from the camera body side 2 to the lens barrel side 3 is a current value within a range of about several tens mA to several hundred mA in the power-on state. Further, the electrical contact BP2 and the electrical contact LP2 are ground terminals corresponding to the operation voltage supplied via the electrical contact BP1 and the electrical contact LP1.

  The electrical contacts BP3 to BP6 are connected to the camera side first communication unit 291. Corresponding to these electrical contacts BP3 to BP6, the electrical contacts LP3 to LP6 are connected to the lens side first communication unit 381. . The camera-side first communication unit 291 and the lens-side first communication unit 381 transmit and receive signals to and from each other using these electrical contacts. The contents of communication performed by the camera-side first communication unit 291 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 the electrical contacts BP7 to BP10. . And the camera side 2nd communication part 292 and the lens side 2nd communication part 382 mutually transmit / receive a signal using these electrical contacts. The contents of communication performed by the camera side second communication unit 292 and the lens side second communication unit 382 will be described in detail later.

  The electrical contacts BP11 and BP12 are connected to a second power supply circuit 240 in the camera body 2. The second power supply circuit 240 supplies an operating voltage to circuits with relatively large power consumption, such as the lens drive motors 321 and 331, via the electrical contact BP11 and the electrical contact LP11. The voltage value supplied by the second power supply circuit 240 is not particularly limited, but the maximum voltage value supplied by the second power supply circuit 240 is the number of maximum voltage values supplied by the first power supply circuit 230. It can be about double. 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 a range of about several tens of mA to several A in the power-on state. The electrical contact BP12 and the electrical contact LP12 are ground terminals corresponding to the operating voltage supplied through the electrical contact BP11 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. 9 constitute the camera transmission / reception unit 29 shown in FIG. 2, and the first communication unit on the lens barrel 3 side shown in FIG. 381 and the second communication unit 382 constitute the lens transmission / reception unit 39 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 36 includes a signal line CLK composed of electrical contacts BP3 and LP3, a signal line BDAT composed of electrical contacts BP4 and LP4, a signal line LDAT composed of electrical contacts BP5 and LP5, and electrical contacts 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 BP6 and LP6, and the lens-side first communication unit 381 to the camera-side first Command data communication is performed in parallel with transmission of response data to the communication unit 291 at a predetermined cycle (for example, at intervals of 16 milliseconds).

  FIG. 10 is a timing chart showing an example of command data communication. The camera control unit 21 and the first camera-side communication unit 291 first confirm the signal level of the signal line RDY at the start of command data communication (T1). Here, the signal level of the signal line RDY indicates whether or not the lens-side first communication unit 381 can communicate. When communication is not possible, the lens control unit 36 and the lens-side first communication unit 381 perform H (High). A level signal is output. The first camera-side 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 execute 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 transmit the clock signal 401 to the lens-side first communication unit 381 using the signal line CLK. . 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 transmit the camera side command packet signal 402 as control data to the lens side first communication unit 381. Send to. When the clock signal 401 is output, the lens control unit 36 and the lens-side first communication unit 381 synchronize with the clock signal 401 and use the signal line LDAT to send a lens-side command packet signal that is response data. 403 is transmitted.

  The lens control unit 36 and the lens side first communication unit 381 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 36 starts the first control process 404 according to the contents of the camera side command packet signal 402 received up to time T2.

  For example, when the received camera-side command packet signal 402 is content requesting specific data on the lens barrel 3 side, the lens control unit 36 uses the content of the command packet signal 402 as the first control processing 404. Along with the analysis, a process for generating the requested specific data is executed. Further, as the first control process 404, the lens control unit 36 uses the checksum data included in the command packet signal 402 to simplify whether there is no error in the communication of the command packet signal 402 from the number of data bytes. A communication error check process is also executed. The specific data signal generated in the first control process 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 has no particular meaning for the lens side. . In this case, the lens control unit 36 executes the communication error check process as described above using the checksum data included in the camera-side data packet signal 406 as the second control process 408 (T4).

  For example, when the camera-side command packet signal 402 is an instruction to drive 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 36 As the control process 404, the contents of the command packet signal 402 are analyzed, and a confirmation signal indicating that the contents have been understood is generated (T2). The confirmation signal generated in the first control process 404 is output to the camera body 2 as a lens-side data packet signal 407 (T3). In addition, as the second control process 408, the lens control unit 36 analyzes the contents of the camera-side data packet signal 406 and executes a communication error check process using the checksum data included in the camera-side data packet signal 406. (T4). After the completion of the second control processing 408, the lens control unit 36 drives the focus lens drive motor 331 based on the received camera-side data packet signal 406, that is, the drive speed and drive amount of the focus lens 33. Thus, the focus lens 33 is driven at the received drive speed by the received drive amount (T5).

  In addition, when the second control process 408 is completed, the lens control unit 36 notifies the lens side first communication unit 381 of the completion of the second control process 408. Thereby, the lens controller 36 outputs an L level signal to the signal line RDY (T5).

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

  Similarly, in one command data communication, the lens control unit 36 and the lens side first communication unit 381 transmit one lens side command packet signal 403 and one lens side data packet signal 407, respectively. As described above, the response data transmitted from the lens barrel 3 to the camera body 2 is also divided into two, but one response data includes both the lens side command packet signal 403 and the lens side data packet signal 407. Configure.

  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. 9, the lens control unit 36 includes a signal line HREQ composed of the electrical contacts BP7 and LP7, a signal line HANS composed of the electrical contacts BP8 and LP8, and a signal line HCLK composed of the electrical contacts BP9 and LP9, Hot line communication is performed through the signal line HDAT formed of the electrical contacts BP10 and LP10, in which communication is performed at a cycle shorter than the command data communication (for example, at intervals of 1 millisecond).

For example, in the present embodiment, lens information of the lens barrel 3 is transmitted from the lens barrel 3 to the camera body 2 by hotline communication. The lens information transmitted by hotline communication includes the lens position of the focus lens 33, the lens position of the zoom lens 32, the current position image plane movement coefficient _Kcur , the minimum image plane movement coefficient _Kmin , and the maximum image plane movement coefficient. K _max and focus limit information 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 control unit 36 refers to a table stored in the lens memory 37 and indicating the relationship between the lens position (zoom lens position and focus lens position) and the image plane movement coefficient K, thereby zoom lens. The current position image plane movement coefficient K _cur corresponding to the current lens position of 32 and the current lens position of the focus lens 33 can be obtained. For example, in the example shown in FIG. 6, when the lens position (focal length) of the zoom lens 32 is “f1” and the lens position (shooting distance) of the focus lens 33 is “D4”, the lens control unit 36. Transmits “K14” as the current position image plane movement coefficient K _cur to the camera control unit 21 by hot line communication.

In the present embodiment, the lens control unit 36 transmits the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max corresponding to the drivable range to the camera control unit 21 by hot line communication. For example, in the example shown in FIG. 6, when the focus limit mode is set to “FULL mode” as shown in FIG. 7A, the lens position (focal length) of the zoom lens 32 is set to “f1”. In some cases, the lens control unit 36 transmits “K11” as the minimum image plane movement coefficient K _{min and} “K19” as the maximum image plane movement coefficient K _max to the camera control unit 21 by hot line communication. On the other hand, in the example shown in FIG. 6, as shown in FIG. 7C, when the focus limit mode is set to the “infinity limit mode”, the lens position (focal length) of the zoom lens 32 is “ In the case of “f1”, the lens control unit 36 transmits “K14” as the minimum image plane movement coefficient K _{min and} “K19” as the maximum image plane movement coefficient K _max to the camera control unit 21 by hot line communication. To do.

  FIG. 11 is a timing chart illustrating an example of hotline communication. FIG. 11A is a diagram illustrating a state in which hotline communication is repeatedly performed at predetermined intervals Tn. Further, FIG. 11B shows a state in which a certain communication period Tx is expanded in the hot line communication repeatedly executed. Hereinafter, a scene in which the lens position of the focus lens 33 is communicated by hot line communication will be described based on the timing chart of FIG.

  The camera control unit 21 and the camera-side second communication unit 292 first output an L level signal to the signal line HREQ in order to start communication by hot line communication (T6). Then, the second lens-side communication unit 382 notifies the lens control unit 36 that this signal has been input to the electrical contact LP7. In response to this notification, the lens control unit 36 starts executing a generation process 501 that generates lens position data. The generation process 501 is a process in which the lens control unit 36 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 36 completes the execution of the generation process 501, the lens control unit 36 and the second lens side communication unit 382 output an L level signal to the signal line HANS (T7). When this signal is input to the electrical contact BP8, the camera control unit 21 and the camera-side second communication unit 292 output the clock signal 502 from the electrical contact BP9 to the signal line HCLK.

  The lens control unit 36 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. When the transmission of the lens position data signal 503 is completed, the lens control unit 36 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).

  Note that command data communication and hotline communication can be executed simultaneously or in parallel.

  Next, the lens information transmission process according to the first embodiment will be described with reference to FIG. FIG. 12 is a flowchart showing lens information transmission processing according to the first embodiment. The following operation is repeatedly executed at predetermined intervals after the hot line communication is started by the lens control unit 36.

First, in step S101, the lens control unit 36 acquires focus limit information and information on the current lens position of the focus lens 33. In step S102, based on the focus limit information acquired in step S101 and the current lens position of the focus lens 33 by the lens control unit 36, whether or not the current lens position of the focus lens 33 exists inside the drivable range. Judgment is made.
For example, in the “FULL mode”, if the lens barrel 3 is within the range between the lens position of the infinity end soft limit SL _{IP and} the lens position of the nearest end soft limit SL _NP , If it is determined that the current lens position of the lens 33 is inside the drivable range, and the lens position is not within the range between the lens position of the infinity end soft limit SL _{IP and} the lens position of the closest end soft limit SL _NP , the focus lens 33 The current lens position is not determined to be inside the drivable range.
Similarly, in the “close-side limit mode”, whether the lens barrel 3 has the focus lens position within the range between the lens position of the infinity end soft limit SL _{IP and} the lens position of the close-side soft limit SL _NS . Judge whether or not. In the “infinity side limit mode”, the lens barrel 3 determines whether the focus lens position is within the range between the lens position of the infinity side soft limit SL _{IS and} the lens position of the closest end soft limit SL _NP. Determine whether.

  Here, the lens control unit 36 normally drives the focus lens 33 inside the drivable range. Therefore, the lens control unit 36 normally determines that the current lens position of the focus lens 33 exists inside the drivable range. On the other hand, for example, when the drivable range is changed by the user operating the focus limit switch 38 to change the focus limit mode, the lens position of the focus lens 33 is temporarily outside the drivable range. There is a case. Here, a case where the lens position of the focus lens 33 is outside the drivable range will be described with reference to FIGS. 13 and 14.

  13 and 14 are diagrams illustrating an example of the relationship among the lens position of the focus lens 33, the image plane movement coefficient, and the drivable range. 13 and 14 illustrate a scene in which the lens position (focal length) of the zoom lens 32 is “f1” in the example illustrated in FIG. 6.

For example, in the example shown in FIG. 13A, the “FULL mode” is set as the focus limit mode, and the lens position from the infinity end soft limit SL _{IP to} the lens position of the closest end soft limit SL _NP is set. The range is set as the drivable range Rf1. In the example shown in FIG. 13A, the current lens position of the focus lens 33 is in the region D6 of the drivable range Rf1. In this case, for example, when the user operates the focus limit switch 38 to change the focus limit mode from “FULL mode” to “infinity limit mode”, as shown in FIG. A range from the lens position of the limit SL _{IS to} the lens position of the closest soft limit SL _NP is set as the drivable range Rf3. In this case, as shown in FIG. 13B, the lens position of the focus lens 33 is inside the drivable range Rf3. Therefore, in step S102, the lens control unit 36 determines that the current lens position of the focus lens 33 exists inside the drivable range.

  On the other hand, in the example shown in FIG. 14A, the lens position of the focus lens 33 is within the region D2 of the drivable range Rf1. In this case, for example, when the user operates the focus limit switch 38 to change the focus limit mode from “FULL mode” to “infinity side limit mode”, as shown in FIG. The current lens position 33 is outside the drivable range Rf3. Therefore, in step S102, the lens control unit 36 determines that the current lens position of the focus lens 33 exists outside the drivable range. Thus, the focus lens 33 may temporarily exist outside the drivable range at the timing when the drivable range of the focus lens 33 is changed.

  In step S102, as a result of determining whether the current lens position of the focus lens 33 is inside or outside the drivable range, as shown in FIG. If it is determined that the current lens position is within the drivable range, the process proceeds to step S103. On the other hand, as shown in FIG. 14B, when it is determined that the current lens position of the focus lens 33 is outside the drivable range, the process proceeds to step S105.

In step S103, since it is determined that the current lens position of the focus lens 33 is inside the drivable range, the lens control unit 36 performs the minimum image plane movement coefficient K _min and the maximum image plane movement according to the drivable range. The coefficient K _max is determined as the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max transmitted to the camera body 2. For example, as shown in FIG. 13A, when the current lens position of the focus lens 33 is inside the drivable range Rf1, the minimum image plane movement coefficient K _min = “K11” corresponding to the drivable range Rf1. Then, the maximum image plane movement coefficient K _max = “K19” is determined as the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max transmitted to the camera body 2.

Further, as shown in FIG. 13B, even when the driveable range of the focus lens 33 is changed, the lens position of the focus lens 33 after the change is inside the driveable range Rf3. Here, in the example shown in FIG. 13B, among the plurality of image plane movement coefficients “K14” to “K19” at each lens position in the drivable range Rf3, “K14” is the minimum image plane in the lens memory 37. The movement coefficient K _min is stored, and “K19” is stored as the maximum image plane movement coefficient K _max . Therefore, “K14”, which is the minimum image plane movement coefficient K _min corresponding to the drivable range Rf3, and “K19”, which is the maximum image plane movement coefficient K _max corresponding to the drivable range Rf3, are transmitted to the camera body 2. The minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max are determined.

In step S104, the lens control unit 36 uses the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max determined in step S103, and the current position image plane movement coefficient K at the current lens position of the focus lens 33. Lens information including _cur , focus limit information, focus lens position, and zoom lens position is transmitted to the camera control unit 21. As described above, when the current lens position of the focus lens 33 is inside the drivable range, the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max corresponding to the drivable range are determined by the camera. It is transmitted to the control unit 21. Further, the lens control unit 36 transmits these pieces of lens information to the camera control unit 21 by hot line communication.

  On the other hand, when it is determined in step S102 that the current lens position of the focus lens 33 is outside the drivable range as shown in FIG. 14B, the process proceeds to step S105. In step S105, the lens control unit 36 determines whether or not the “infinity limit mode” is set as the focus limit mode. When the “infinity side restriction mode” is set, the process proceeds to step S106, and when the “close side restriction mode” is set, the process proceeds to step S108.

In step S106, as shown in FIG. 14B, when the focus limit mode is set to “infinity limit mode”, the current lens position of the focus lens 33 is temporarily outside the drivable range Rf3. It is thought that it became. Further, in this case, as shown in FIG. 14B, it can be determined that the current lens position of the focus lens 33 is on the infinity side with respect to the driveable range Rf3 of the focus lens 33. For example, in the example shown in FIG. 14B, the current lens position of the focus lens 33 is in the region “D2”, and the lens position closest to the drivable range Rf3 is the region “D9”. In this case, the lens control unit 36 transmits the smallest current position image plane movement coefficient K _cur “K12” among the image plane movement coefficients of the lens position areas D2 to D9 to the minimum image plane movement coefficient K _min. Determine as.

Moreover, In step S107, the lens control unit 36, the maximum image plane shift factor K _max corresponding to the drive range is determined as the maximum image plane shift factor K _max to be transmitted to the camera body 2. For example, in the example shown in FIG. 14B, the current lens position of the focus lens 33 is in the region “D2”, and the lens position closest to the drivable range Rf3 is the region “D9”. In this case, the lens control unit 36 transmits to the camera body 2 the image plane movement coefficient “K19” of the lens position closest to the drivable range Rf3 among the image plane movement coefficients of the lens position areas D2 to D9. determining a maximum image plane shift factor _{K max} (driving range Rf3 maximum image plane shift factor _{K max} corresponding to) that.

Then, the process proceeds to step S104, and the minimum image plane shift factor _{K min} determined in step S106, the maximum image plane shift factor _{K max} determined at step S107, the current position image plane shift factor _{K cur,} focus limit information Then, lens information including the focus lens position and the zoom lens position is transmitted to the camera control unit 21 via hotline communication.

On the other hand, if it is determined in step S105 that the “closest side restriction mode” is set, the process proceeds to step S108. In this case, it is considered that the current lens position of the focus lens 33 is temporarily outside the drivable range Rf2 because the focus limit mode is set to the “closest limit mode”. In this case, the current lens position of the focus lens 33 can be determined to be closer to the driveable range Rf2 of the focus lens 33. For example, when the current lens position of the focus lens 33 is in the region “D8” and the lens position on the most infinite side of the drivable range Rf2 is the region “D1” (not shown), the lens control unit 36 sets the lens position. Among the image plane movement coefficients of the regions D1 to D8, the largest current position image plane movement coefficient K _cur “K18” is determined as the maximum image plane movement coefficient K _max transmitted to the camera body 2. In the subsequent step S109, when the current lens position of the focus lens 33 is in the region “D8” and the lens position on the most infinite side of the drivable range Rf2 is the region “D1”, the lens control unit 36 The minimum image plane movement coefficient K _min (S) that transmits the image plane movement coefficient “K11” of the lens position closest to the infinity of the smallest drivable range Rf2 among the image plane movement coefficients of the position areas D1 to D8 to the camera body 2. It is determined as the minimum image plane movement coefficient K _min ) corresponding to the drivable range Rf2.

In step S104, the maximum image plane movement coefficient K _max determined in step S108, the minimum image plane movement coefficient K _min determined in step S109, the current position image plane movement coefficient K _cur , and focus limit information. Then, lens information including the focus lens position and the zoom lens position is transmitted to the camera control unit 21 via hotline communication.

  Next, an operation example of the camera 1 according to the present embodiment will be described with reference to FIG. FIG. 15 is a flowchart showing the operation of the camera 1 according to this embodiment. The following operation is started when the camera 1 is turned on.

  First, in step S201, the camera body 2 performs communication for identifying the lens barrel 3. This is because communicable communication formats differ depending on the type of lens barrel. Then, the process proceeds to step S202. In step S202, it is determined whether or not the photographer has turned on the live view shooting on / off switch provided in the operation unit 28, and the live view shooting is turned on. The mirror system 220 becomes the shooting position of the subject, and the light flux from the subject is guided to the image sensor 22.

In step S203, hot line communication is started between the camera body 2 and the lens barrel 3. In the hotline communication, as described above, the L level signal (request signal) output to the signal line HREQ is transmitted to the lens control unit 36 by the camera control unit 21 and the camera-side second communication unit 292. Thereby, the lens control unit 36 transmits lens information to the camera control unit 21, and the camera control unit 21 receives the lens information transmitted from the lens control unit 36. In addition, the lens control unit 36 repeatedly transmits a request signal to the camera control unit 21, so that the camera control unit 21 repeatedly receives lens information from the camera control unit 21. 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 _Kcur , the minimum image plane movement coefficient _Kmin , the maximum image plane movement coefficient _Kmax , and the focus. Each piece of limit information is included. Hot line communication is repeated after step S203, for example, until the power switch is turned off.

In this embodiment, the lens control unit 36 transmits the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max to the camera control unit 21 by the lens information transmission process shown in FIG. That is, when the current lens position of the focus lens 33 is inside the drivable range, the lens control unit 36 sets the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max according to the drivable range to the camera. It transmits to the control part 21. On the other hand, when the current lens position of the focus lens 33 is outside the drivable range and the “infinity side limit mode” is set, the lens control unit 36 determines the maximum according to the drivable range Rf3. transmits the image plane shift factor _{K max} to the camera control unit 21 transmits a current position image plane shift factor _{K cur} to the camera control unit 21 as the minimum image plane shift factor _{K min.} Further, when the “close-side limit mode” is set, the lens control unit 36 transmits the minimum image plane movement coefficient K _min corresponding to the drivable range Rf2 to the camera control unit 21 and the current position image. and it transmits the camera control unit 21 to the surface movement coefficient _{K cur} the maximum image plane shift factor _{K max.} As a result, the camera control unit 21 determines whether the current lens position of the focus lens 33 is outside the drivable range or the inside when the focus lens 33 is outside the drivable range, and the minimum image plane movement coefficient K _min or the maximum image plane movement coefficient K _max. Will be received.

Further, in the present embodiment, the camera control unit 21 receives focus limit information from the lens control unit 36. For example, when the “closest limit mode” shown in FIG. 4B is set, the camera control unit 21 uses the limit position of the drivable range Rf2 in the “closest limit mode” as the focus limit information. The infinity end soft limit SL _IP and the near side soft limit SL _NS as a reference are received from the lens control unit 36.

  In step S204, it is determined whether or not the photographer has performed a half-press operation of the release button provided in the operation unit 28 (turning on the first switch SW1), an AF activation operation, or the like. If so, the process proceeds to step S205 (in the following, the case where a half-press operation has been performed will be described in detail).

  In step S205, the camera control unit 21 determines whether or not the current lens position of the focus lens 33 is inside the drivable range. For example, the camera control unit 21 determines whether or not the current lens position of the focus lens 33 is inside the drivable range based on the current lens position and focus limit information of the focus lens 33 acquired in step S203. . As shown in FIG. 14B, when the current lens position of the focus lens 33 is outside the drivable range, the process proceeds to step S206, and return drive is performed to move the focus lens 33 to the inside of the drivable range. Is done.

  That is, in step S206, the camera control unit 21 gives an instruction to move the focus lens 33 from the current lens position to the inside of the drivable range, whereby the lens control unit 36 causes the focus lens 33 to be drivable. The return drive is performed to drive to the inner side. Further, in the return drive, the camera control unit 21 calculates a focus evaluation value by a contrast detection method at a predetermined lens interval while moving the focus lens 33 from the outside of the driveable range to the inside. The focus evaluation value calculated in this way can be used when determining the direction in which the in-focus position exists after the focus lens 33 moves to the inside of the drivable range. In the return drive, unlike the scan drive described later, the focus position is not detected (the focus position is detected using the focus evaluation value obtained during the return drive and the focus lens 33 is adjusted. Focus drive control for driving to the focal position is not performed). Therefore, in the return drive, the focus lens 33 can be driven at a speed higher than the drive speed at which a focus position described later can be detected appropriately.

In the subsequent step S207, the camera control unit 21 receives the latest minimum image plane movement coefficient _Kmin and maximum image plane movement coefficient _Kmax . That is, as shown in FIG. 14B, when the current lens position of the focus lens 33 is outside the drivable range, the camera control unit 21 sets the current position image plane movement coefficient K _cur to the minimum image plane. The movement coefficient K _min or the maximum image plane movement coefficient K _max is received from the lens control unit 36 (see FIG. 12). On the other hand, when the current lens position of the focus lens 33 is outside the drivable range, return driving is performed to drive the focus lens 33 toward the inside of the drivable range. In accordance with the change, the current position image plane movement coefficient _Kcur changes. Therefore, when the current lens position of the focus lens 33 is outside the drivable range, the minimum image plane movement coefficient K _min or the maximum image plane movement coefficient K _max transmitted from the lens control unit 36 gradually changes. Become. Therefore, the camera control unit 21 performs the return driving for driving the focus lens 33 toward the inside of the drivable range until the focus lens 33 is driven to the inside of the drivable range. The current position image plane movement coefficient K _cur at the 33 latest lens positions is received from the lens controller 36 as the latest minimum image plane movement coefficient K _min or the maximum image plane movement coefficient K _max .

For example, as shown in FIG. 14B, when the current lens position of the focus lens 33 is on the infinity side with respect to the driveable range Rf3, the focus lens 33 is driven closer to the driveable range Rf3. The return drive is performed to drive up to. In this case, as shown in FIG. 14B, when the lens position of the focus lens 33 is in the region “D2”, the camera control unit 21 sets the current position image plane movement coefficient K _cur “K12” to the minimum image. Received as a surface movement coefficient _Kmin . After that, when the focus lens 33 advances to the closest side and the lens position of the focus lens 33 becomes the region “D3” as shown in FIG. 14C, the camera control unit 21 determines that the current position image plane movement coefficient K _cur “K13” is received as the minimum image plane movement coefficient K _min . Further, when the focus lens 33 advances to the closest side and the focus lens 33 is driven to the region “D4” as shown in FIG. 14D, and the lens position of the focus lens 33 falls within the drivable range, the camera control unit 21 receives the minimum image plane movement coefficient K _min “K14” corresponding to the drivable range from the lens control unit 36.

  When the focus lens 33 reaches the inside of the drivable range, in step S205, it is determined that the current lens position of the focus lens 33 is inside the drivable range, the return drive is terminated, and scan drive described later is executed. Therefore, the process proceeds to step S208.

  In step S208, the camera control unit 21 transmits a scan drive command (scan drive start instruction) to the lens control unit 36 in order to perform focus detection by the contrast detection method. The scan drive command (instruction of drive speed at the time of scan drive or instruction of drive position) to the lens control unit 36 may be given by the drive speed of the focus lens 33 or may be given by the image plane moving speed. Alternatively, it may be given as a target drive position.

In step S209, the camera control unit 21 determines the scan drive speed V, which is the drive speed of the focus lens 33 in the scan operation, based on the minimum image plane movement coefficient K _min acquired in step S203 or step S207. Processing is performed.

  In the scan operation, the focus lens drive motor 331 drives the focus lens 33 at the scan drive speed V determined in step S209, and the camera control unit 21 calculates a focus evaluation value by a contrast detection method. This is an operation of performing in-focus position detection by a contrast detection method at a predetermined interval.

  In this scanning operation, when detecting the in-focus position by the contrast detection method, the camera control unit 21 calculates a focus evaluation value at a predetermined sampling interval while driving the focus lens 33 to scan. A lens position at which the calculated focus evaluation value reaches a peak is detected as a focus position. Specifically, the camera control unit 21 scans the focus lens 33 to move the image plane of the optical system in the optical axis direction, thereby calculating a focus evaluation value on a different image plane, The lens position at which the evaluation value reaches a peak is detected as the focus position. On the other hand, however, if the moving speed of the image plane is made too fast, the interval between the image planes for calculating the focus evaluation value becomes too large, and the focus position may not be detected properly. . In particular, the image plane movement coefficient K indicating the amount of movement of the image plane with respect to the driving amount of the focus lens 33 changes according to the lens position of the focus lens 33 in the optical axis direction. Even when the focus lens 33 is driven, the moving speed of the image plane becomes too fast depending on the lens position of the focus lens 33. Therefore, the interval between the image planes for calculating the focus evaluation value becomes too large, and the in-focus position is set. It may become impossible to detect properly.

Therefore, in the present embodiment, the camera control unit 21 calculates the scan drive speed V when performing the scan drive of the focus lens 33 based on the latest minimum image plane movement coefficient K _min received from the lens control unit 36. . The camera control unit 21 uses a minimum image plane movement coefficient K _min to scan at a driving speed that can appropriately detect the in-focus position by a contrast detection method and a maximum driving speed. A drive speed V is calculated. In the present embodiment, when the focus lens 33 exists inside the drivable range (step S205 = Yes), scan driving is executed. In this case, the minimum image plane movement coefficient K _min corresponding to the drivable range is transmitted to the camera control unit 21 by the lens information transmission process shown in FIG. Therefore, the scan drive speed V is determined using the minimum image plane movement coefficient K _min corresponding to the driveable range, and the scan drive is executed within the driveable range of the focus lens 33.

  In step S210, the scan operation is started at the scan drive speed V determined in step S209. Specifically, the camera control unit 21 sends a scan drive start command to the lens control unit 36, and the lens control unit 36 drives the focus lens drive motor 331 based on the command from the camera control unit 21 to focus. The lens 33 is scan-driven at the scan drive speed V determined in step S207. Then, the camera control unit 21 reads out the pixel output from the imaging pixels of the imaging element 22 at predetermined intervals while driving the focus lens 33 at the scan driving speed V, and calculates a focus evaluation value based on the readout. Thereby, the focus evaluation value at different focus lens positions is acquired, and the focus position is detected by the contrast detection method.

  Next, in step S211, the camera control unit 21 determines whether the peak value of the focus evaluation value has been detected (whether the in-focus position has been detected). When the peak value of the focus evaluation value cannot be detected, the process returns to step S210, and the operations of steps S210 and S211 are performed until the peak value of the focus evaluation value can be detected or until the focus lens 33 is driven to a predetermined driving end. Repeat. On the other hand, when the peak value of the focus evaluation value can be detected, the process proceeds to step S212.

  When the peak value of the focus evaluation value can be detected, the process proceeds to step S212. In step S212, the camera control unit 21 instructs the lens control unit 36 to drive the focus to a position corresponding to the peak value of the focus evaluation value. Send. The lens control unit 36 performs drive control of the focus lens 33 in accordance with the received command.

  Next, the process proceeds to step S213. In step S213, the camera control unit 21 determines that the focus lens 33 has reached a position corresponding to the peak value of the focus evaluation value, and the photographer fully presses the shutter release button ( When the second switch SW2 is turned on, still image shooting control is performed. After the photographing control is completed, the process returns to step S203 again.

  Next, the abnormality determination process according to the first embodiment will be described. FIG. 16 is a flowchart showing the abnormality determination process according to the first embodiment. This abnormality determination process is performed in parallel with the operation of the camera 1 shown in FIG. 15 when, for example, the photographer performs a half-press operation of the release button provided in the operation unit 28 or an AF activation operation. Done. Further, the abnormality determination process shown in FIG. 16 is repeatedly executed at predetermined intervals.

First, in step S301, the current position image plane shift factor K _cur which have repeatedly acquired from hotline communication, determines whether less or not than the minimum image plane shift factor K _min. That is, the minimum image plane shift factor K _min> Current current became position image plane shift factor K _cur position image plane shift factor K _cur it is determined whether or not detected. If the minimum image plane shift factor K _min> current position image plane shift factor K _cur and since current position image plane shift factor K _cur is detected, communication between the camera body 2 and the lens barrel 3 abnormality Therefore, the process proceeds to step S305, sets the abnormality flag = 1, and ends the abnormality determination process. It should be noted that the abnormality flag = 0 is set in normal times, such as when no abnormality has occurred. On the other hand, if the current position image plane movement coefficient K _cur that satisfies the minimum image plane movement coefficient K _min > current position image plane movement coefficient K _cur is not detected, the process proceeds to step S302.

For example, in the example shown in FIG. 13B, since the current lens position of the focus lens 33 is inside the drivable range Rf3, the minimum image plane movement coefficient K _min “K14” corresponding to the drivable range and the current position The image plane movement coefficient K _cur “K16” is transmitted to the camera control unit 21. In this case, since the current position image plane movement coefficient K _cur “K16” is larger than the minimum image plane movement coefficient K _min “K14”, the process proceeds to step S302. On the other hand, in the example shown in FIG. 13B, some abnormality such as a communication abnormality occurs between the camera body 2 and the lens barrel 3, and the minimum image plane movement coefficient _Kcur is received as “K17”. If it is determined that the current position image plane movement coefficient K _cur “K16” is larger than the minimum image plane movement coefficient K _min “K17”, the process proceeds to step S 305, and between the camera body 2 and the lens barrel 3. It is determined that some abnormality such as a communication abnormality has occurred.

As shown in FIG. 14B, when the current lens position of the focus lens 33 is outside the drivable range, the current position image plane movement coefficient K _cur is obtained by the lens information transmission process shown in FIG. “K12” is transmitted to the camera control unit 21 as the minimum image plane movement coefficient K _min . Accordingly, the camera control unit 21 determines that the current position image plane movement coefficient K _cur “K12” is equal to the minimum image plane movement coefficient K _min “K12”, and the process proceeds to step S302. Thus, in the present embodiment, in order the current lens position of the focus lens 33 is outside of the driving range, it is determined that the current position image plane shift factor K _cur is less than the minimum image plane shift factor K _min As a result, it is possible to effectively prevent erroneous determination that an abnormality such as a communication abnormality has occurred between the camera body 2 and the lens barrel 3.

In step S302, it is determined whether or not the focus lens 33 has been driven from the closest end to the infinity end between the time when the camera 1 is turned on and the present time. In particular, in the present embodiment, since the drivable range of the focus lens 33 is set, it is determined whether or not the focus lens 33 has been driven from the closest end to the infinity end of the currently set drivable range. Is done. For example, in the example shown in FIG. 13B, since the range from the lens position of the infinity side soft limit SL _IS to the closest soft limit SL _NP is set as the driveable range Rf3, the focus lens 33 Is driven from the closest end soft limit SL _NP , which is the closest end of the drivable range Rf3, to the lens position of the infinity side soft limit SL _IS , which is the infinite end.

When the focus lens 33 is driven from the close end to the infinity end, the process proceeds to step S306, and as a result of driving the focus lens 33 from the close end to the infinity end in step S306, hot line communication is performed. It is determined whether or not the current position image plane movement coefficient K _cur obtained as described above can be detected as the current position image plane movement coefficient K _cur = minimum image plane movement coefficient K _min . Even when the focus lens 33 is driven from the closest end to the infinite end, when the current position image plane movement coefficient K _cur = the minimum image plane movement coefficient K _min cannot be detected, Since some abnormality such as a communication abnormality between the camera body 2 and the lens barrel 3 is considered to have occurred, the process proceeds to step S307, the abnormality flag = 2 is set, and the abnormality determination process is terminated. If it is detected in step S306 that the current position image plane movement coefficient K _cur = minimum image plane movement coefficient K _min is detected, it is determined that no abnormality has occurred, and the abnormality determination process ends.

  On the other hand, if it is determined in step S302 that the focus lens 33 is not driven from the closest end to the infinity end, the process proceeds to step S303. In step S <b> 303, it is determined whether or not the zoom operation of the zoom lens 32 has been performed by the camera control unit 21. When it is determined that the driving operation of the zoom lens 32 has been performed, the process proceeds to step S304, and when it is determined that the driving operation of the zoom lens 32 has not been performed, the process proceeds to step S308.

In step S304, the camera control unit 21 transmits a request signal again to the lens control unit 36, and the lens control unit 36 corresponds to the lens position of the zoom lens 32 after driving the zoom lens 32 to the camera control unit 21. The minimum image plane movement coefficient K _min is transmitted. Further, the camera control unit 21 resets the minimum image plane movement coefficient K _min and the current position image plane movement coefficient K _cur obtained before driving the zoom lens 32.
The determinations in steps S301 and S306 described above are for comparing the minimum image plane movement coefficient K _min and the current position image plane movement coefficient K _cur acquired when the lens position of the zoom lens 32 is at the same position. When the lens position of the lens 32 fluctuates, the determinations in steps S301 and S306 described above can be appropriately performed unless the minimum image plane movement coefficient _Kmin and the current position image plane movement coefficient _Kcur are newly collected. Because it disappears. When the process of step S304 ends, the process returns to step S301.

If it is determined in step S303 that the zoom lens 32 is not being driven, the process proceeds to step S308. In step S308, the lens control unit 36, the minimum image plane shift factor _{K min} at a currently obtained minimum image plane shift factor _{K Min_0} obtained in this process, the minimum image plane shift factor _{K min} obtained in the previous process preceding The acquired minimum image plane movement coefficient K _{min — 1} is compared, and it is determined whether these are the same value or different values. That is, in step S308, it is determined whether or not the minimum image plane movement coefficient K _min that has been repeatedly acquired has changed. When the _currently acquired minimum image plane movement coefficient K _{min — 0} and the previously acquired minimum image plane movement coefficient K _{min — 1} are the same value, that is, it is determined that the minimum acquired image plane movement coefficient K _min has not changed repeatedly. In this case, it is determined that no abnormality has occurred, and the abnormality determination process is terminated. On the other hand, when the _currently acquired minimum image plane movement coefficient K _{min — 0} and the previously acquired minimum image plane movement coefficient K _{min — 1} are different values, that is, it is determined that the minimum image plane movement coefficient K _min acquired repeatedly has changed. In the case, the process proceeds to step S309.

In step S309, as in step S202 shown in FIG. 15, it is determined whether or not the current lens position of the focus lens 33 is outside the drivable range. If the current lens position of the focus lens 33 is outside the drivable range, the abnormality determination process shown in FIG. 15 is terminated. Such a change in the minimum image plane movement coefficient K _min is such that the current lens position of the focus lens 33 is outside the drivable range, so that the current position image plane movement coefficient K _cur is restored while the focus lens 33 is driven to return. the is due to repeatedly transmitted as the minimum image plane shift factor K _min, is that some abnormality of the communication abnormality between the camera body 2 and the lens barrel 3 is generated because unthinkable. On the other hand, if the current lens position of the focus lens 33 exists inside the drivable range, the process proceeds to step SS310, and the abnormality flag = 3 is set.

  When “abnormal flag = 1”, “abnormal flag = 2”, or “abnormal flag = 3” is set, it is preferable to perform an abnormal process. As the abnormal process, for example, it is preferable to prohibit focusing display with the electronic viewfinder 26 or the like. When “abnormal flag = 1”, “abnormal flag = 2”, or “abnormal flag = 3” is set, there may be a communication abnormality, circuit abnormality, power supply abnormality, etc., and AF reliability Can not guarantee. For this reason, it is preferable to perform abnormality processing such as prohibition of focus display in order not to perform “focus display” with low reliability. When the abnormality flag = 1, the abnormality flag = 2, or the abnormality flag = 3 is set and the focus display is prohibited, the focus lens 33 is set to the in-focus position in step S212. Even if it reaches, the in-focus display is not performed.

In addition, when “abnormal flag = 1”, “abnormal flag = 2”, or “abnormal flag = 3” is set, for example, instead of performing a process for prohibiting the focus display, It is also preferable to perform a whole area search for driving from the closest end to the infinity end together with the processing for prohibiting the focus display. By performing a global search, it may be possible to confirm that the cause of the abnormality has been resolved.
Further, it is more preferable to perform a whole area search for driving the focus lens 33 from the closest end to the infinity end at a second driving speed that is sufficiently slower than the first driving speed that is a normal driving speed. This is because a safer global search is possible by performing at a sufficiently low second driving speed. Further, for example, the driving speed is too fast for the focus lens 33, when the current position image plane shift factor K _{cur =} current position image plane shift factor K _cur that minimizes image plane shift factor K _min is not detected, by performing the entire search at a sufficiently slow second driving speed, there is a case where the current position image plane shift factor K _{cur =} minimum image plane shift factor K _min may detect the current position image plane shift factor K _cur .

  Further, when “abnormal flag = 1”, “abnormal flag = 2”, or “abnormal flag = 3” is set, a process for prohibiting the focus display or the second drive sufficiently slow Instead of the entire area search process at the speed, or together with these processes, a process for prohibiting both the focus detection by the phase difference detection method and the focus detection by the contrast detection method may be performed. Especially when “abnormal flag = 1”, “abnormal flag = 2”, or “abnormal flag = 3” is set, and it is considered that some abnormality such as a communication abnormality has occurred, the phase difference detection method is used. Even if focus detection by focus detection and contrast detection method is performed, there is a high possibility that good focus detection results cannot be obtained. Therefore, in this case, focus detection by phase difference detection method and contrast detection method are used. Processing for prohibiting focus detection can be performed.

Also, once “abnormal flag = 1”, “abnormal flag = 2”, or “abnormal flag = 3” is set, it is considered that some abnormality such as a communication abnormality has occurred. Until the lens is turned off or until the lens barrel 3 is replaced, the abnormality flag is not reset, and “abnormal flag = 1”, “abnormal flag = 2”, or “abnormal flag = 3” is set. It is desirable to keep it.
For example, when the abnormality flag = 1, “abnormal flag = 2”, or “abnormal flag = 3” is set, the reliability of AF cannot be guaranteed, so unnecessary driving of the focus lens 33 is avoided. Therefore, the camera control unit 21 may perform processing for prohibiting the driving of the focus lens 33 regardless of whether or not the peak value can be detected in step S211. In this case, it is preferable to prohibit the driving of the focus lens 33 until the power is turned off or the lens barrel 3 is replaced.
For example, when the abnormality flag = 1, the abnormality flag = 2, or the abnormality flag = 3 is set, the camera control unit 21 is sufficiently slow regardless of whether or not the peak value can be detected in step S211. Processing to perform whole area search at the second driving speed, processing to prohibit at least one of focus detection by the phase difference detection method and focus detection by the contrast detection method, processing to turn off the camera, warning that an abnormality has occurred Display or the like may be performed.
Further, for example, when the abnormality flag = 1, the abnormality flag = 2, or the abnormality flag = 3 is set, the reliability of AF cannot be guaranteed, so the camera control unit 21 detects the peak value in step S211. Even if possible, the process of not performing the focusing drive in step S212 may be performed.

As described above, in the first embodiment, when the focal length of the zoom lens 32 is not changed, the minimum image plane movement coefficient K _min that changes according to the focal length of the zoom lens 32 changes. It is determined that some abnormality such as a communication abnormality has occurred between the main body 2 and the lens barrel 3, and an abnormality process is executed. As a result, when any abnormality such as a communication abnormality occurs between the camera body 2 and the lens barrel 3, it is possible to appropriately notify the user that the abnormality has occurred. In addition, when any abnormality such as a communication abnormality occurs between the camera body 2 and the lens barrel 3, the focusing operation is not performed, so that the user cannot focus out of focus. It is possible to effectively prevent an image or the like from being captured.

In this embodiment, when the focal length of the zoom lens 32 is not changed, even when the minimum image plane movement coefficient K _min is changed, as shown in FIG. 14B, the lens position of the focus lens 33 is changed. Is outside the drivable range, it is not determined that some abnormality such as a communication abnormality has occurred between the camera body 2 and the lens barrel 3, and the abnormality process is not executed. In this embodiment, if the current lens position of the focus lens 33 is outside the drivable range, while returning drives the focus lens 33, a current position image plane shift factor K _cur as the minimum image plane shift factor K _min This is because the transmission is repeatedly performed and the change in the minimum image plane movement coefficient K _min is considered to be caused by such an operation of the lens barrel 3.

<< Second Embodiment >>
Next, a second embodiment will be described. In the second embodiment, the camera 1 shown in FIG. 1 has the same configuration as that of the first embodiment described above except that it operates as described below. Specifically, the camera 1 according to the second embodiment is the same as the first embodiment except that the lens information transmission process shown in FIG. 17 and the abnormality determination process shown in FIG. 18 operate as described below. It operates in the same manner as the camera 1 concerned.

  FIG. 17 is a flowchart showing lens information transmission processing according to the second embodiment. The lens information transmission process according to the second embodiment will be described below with reference to FIG. Note that the lens information transmission processing according to the second embodiment is also repeatedly executed at predetermined intervals by the lens control unit 36 after hot line communication is started.

  First, in step S401, as in step S101 of the first embodiment, acquisition of focus limit information and information on the current lens position of the focus lens 33 is performed.

Then, in step S402, the lens control unit 36, whether the current position image plane shift factor K _cur corresponding to the current lens position of the focus lens 33 is smaller than the minimum image plane shift factor K _min corresponding to the drive range not Judgment is made. For example, in the example shown in FIG. 14 (B), a current position image plane shift factor _{K cur} is "K12", the minimum image plane shift factor _{K min} corresponding to the drive range Rf3 is "K14". Therefore, it is determined that the current position image plane shift factor K _cur less than the minimum image plane shift factor K _min corresponding to the drive range Rf3. Proceeds to step S403 when the current position image plane shift factor K _cur is determined to be the minimum image plane shift factor K _min or more in accordance with the driving range, while the current position image plane shift factor K _cur drivable If it is determined that it is smaller than the minimum image plane movement coefficient K _min corresponding to the range, the process proceeds to step S404.

In step S403, since it is determined that the current position image plane shift factor K _cur driving range to minimize image plane shift factor K _min or more in accordance with, as in step S103 of the first embodiment, the driving range Is determined as the minimum image plane movement coefficient K _min transmitted to the camera body 2. On the other hand, in step S404, since the current position image plane shift factor K _cur is determined to be smaller than the minimum image plane shift factor K _min corresponding to the drive range, as in step S106 of the first embodiment, the focus The current position image plane movement coefficient K _{cur at} the current lens position of the lens 33 is determined as the minimum image plane movement coefficient K _min transmitted to the camera body 2.

In step S405, the lens control unit 36 determines whether the current position image plane movement coefficient K _cur corresponding to the current lens position of the focus lens 33 is larger than the maximum image plane movement coefficient K _max corresponding to the drivable range. Judgment is made. Proceeds to step S407 when the current position image plane shift factor K _cur is determined to be larger than the maximum image plane shift factor K _max corresponding to the drive range while the current position image plane shift factor K _cur drivable If it is determined that it is equal to or less than the maximum image plane movement coefficient K _max corresponding to the range, the process proceeds to step S406.

In step S406, since it is determined that the current position image plane shift factor K _cur is less than or equal to the maximum image plane shift factor K _max corresponding to the drive range, as in step S103 of the first embodiment, the driving range Is determined as the maximum image plane movement coefficient K _max transmitted to the camera body 2. On the other hand, in step S407, since the current position image plane shift factor K _cur is determined to be larger than the maximum image plane shift factor K _max corresponding to the drive range, as in step S108 of the first embodiment, the focus The current position image plane movement coefficient K _{cur at} the current lens position of the lens 33 is determined as the maximum image plane movement coefficient K _max transmitted to the camera body 2.

In step S408, as in step S104 of the first embodiment, the minimum image plane movement coefficient K _min determined in step S403 or S404, and the maximum image plane movement coefficient K _max determined in step S406 or S407. The lens information including the current position image plane movement coefficient K _{cur at} the current lens position of the focus lens 33, the focus limit information, the focus lens position, and the zoom lens position is transmitted to the camera control unit 21.

  Next, the abnormality determination process according to the second embodiment will be described. FIG. 18 is a flowchart showing an abnormality determination process according to the second embodiment. In FIG. 18, steps S302 to S305 and S307 to S310 are the same as those in FIG. As in the first embodiment, the abnormality determination process shown in FIG. 18 is performed when, for example, the photographer performs a half-press operation of the release button provided in the operation unit 28 or an AF activation operation. This is performed in parallel with the operation of the camera 1 shown in FIG.

First, in step S501, whether the current position image plane shift factor K _cur which have repeatedly acquired from hotline communication is greater than a maximum image plane shift factor K _max, or less than the minimum image plane shift factor K _min A determination is made whether or not. Maximum image plane shift factor _{K max} <current position image plane shift factor _{K cur,} or the minimum image plane shift factor _{K min>} Current current became position image plane shift factor _{K cur} position image plane shift factor _{K cur} is detected In this case, since it is considered that some abnormality such as a communication abnormality between the camera body 2 and the lens barrel 3 has occurred, the process proceeds to step S305, the abnormality flag = 1 is set, and the abnormality determination process ends. To do. On the other hand, the maximum image plane shift factor _{K max} <current position image plane shift factor _{K cur,} or the minimum image plane shift factor _{K min>} current position image plane shift factor _{K cur} and since current position image plane shift factor _{K cur} detection If not, the process proceeds to step S302.

Here, in the second embodiment, 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 transmitted from the lens information transmission process shown in FIG. The abnormality determination process is performed using. For example, in the example shown in FIG. 13B, the current position image plane movement coefficient K _cur “K16” and the minimum image plane movement coefficient K _min “K14 according to the drivable range are obtained from the lens information transmission process shown in FIG. And the maximum image plane movement coefficient K _max “K19” corresponding to the drivable range is transmitted to the camera control unit 21. Accordingly, the camera control unit 21 determines that the current position image plane movement coefficient K _cur “K16” is larger than the minimum image plane movement coefficient K _min “K14” and is larger than the maximum image plane movement coefficient K _max “K19”. It judges that it is small and progresses to step S302.

In the example shown in FIG. 14B, the current position image plane movement coefficient K _cur “K12” is smaller than the minimum image plane movement coefficient K _min “K14” corresponding to the drivable range. Therefore, in the lens information transmission process shown in FIG. 17, the current position image plane movement coefficient K _cur “K12” is transmitted to the camera control unit 21 as the minimum image plane movement coefficient K _min . In addition, the current position image plane movement coefficient K _cur “K12” and the maximum image plane movement coefficient K _max “K19” corresponding to the drivable range are transmitted to the camera control unit 21 through the lens information transmission process shown in FIG. Is done. Accordingly, the camera control unit 21 has the current position image plane movement coefficient K _cur “K12” equal to the minimum image plane movement coefficient K _min “K12” and smaller than the maximum image plane movement coefficient K _max “K19”. The process proceeds to step S302.

If it is determined in step S302 that the focus lens 33 has been driven from the closest end to the infinity end, the process proceeds to step S506. In step S506, the focus lens 33, the result of driving from the closest end to the infinity end, as the current position image plane shift factor K _cur obtained by hot line communication, moving the current position image plane coefficient K _{cur =} maximum image It is determined whether or not the one that has reached the plane movement coefficient K _max and the one that has reached the current position image plane movement coefficient K _cur minimum image plane movement coefficient K _min have been detected. Although the focus lens 33 is driven from the closest end to the infinity end, the current position image plane movement coefficient K _cur = the maximum image plane movement coefficient K _max and the current position image plane movement coefficient If it is not possible to detect the one with K _cur = minimum image plane movement coefficient K _min , it is considered that some abnormality such as a communication abnormality between the camera body 2 and the lens barrel 3 has occurred. In step S307, the abnormality flag = 2 is set, and the abnormality determination process is terminated. In step S506, the current position image plane movement coefficient K _cur = the maximum image plane movement coefficient K _max and the current position image plane movement coefficient K _cur = the minimum image plane movement coefficient K _min can be detected. If it is found, the abnormality determination process is terminated.

Similarly to the first embodiment, when it is determined in step S303 that the driving operation of the zoom lens 32 has not been performed, it is determined that the minimum image plane movement coefficient K _min has changed. (Step S308 = No), it is determined whether or not the current lens position of the focus lens 33 is outside the drivable range (Step S309). If the current lens position of the focus lens 33 is within the drivable range, it is considered that some abnormality such as a communication abnormality between the camera body 2 and the lens barrel 3 has occurred. Then, the abnormality flag is set to 3 and the abnormality determination process is terminated. On the other hand, when the current lens position of the focus lens 33 is outside the drivable range, such a change in the minimum image plane movement coefficient K _min causes the current position image plane movement coefficient while driving the focus lens 33 to return. determines that the K _cur is by repeatedly transmits as the minimum image plane shift factor K _min, abnormality is not determined, and ends the abnormality determination process.

As described above, in the second embodiment, when the current position image plane movement coefficient K _cur is smaller than the minimum image plane movement coefficient K _min , the current position image plane movement coefficient K _{cur is changed} to the minimum image plane movement coefficient K _min. To the camera control unit 21. When the current position image plane movement coefficient K _cur is larger than the maximum image plane movement coefficient K _max , the current position image plane movement coefficient K _cur is transmitted to the camera control unit 21 as the maximum image plane movement coefficient K _max . As a result, in the second embodiment, in addition to the effects of the first embodiment, appropriate determination is made according to the lens position of the focus lens 33 without determining whether or not the focus lens 33 exists inside the drivable range. A simple image plane movement coefficient can be transmitted to the camera control unit 21. As a result, even when the focus lens 33 exists outside the drivable range, the abnormality can be appropriately determined in the abnormality determination process shown in FIG.

<< Third Embodiment >>
Next, a third embodiment will be described. In the third embodiment, the camera 1 shown in FIG. 1 has the same configuration as that of the above-described first embodiment except that the camera 1 operates as described below. Specifically, the camera 1 according to the third embodiment is the same as the camera 1 according to the first embodiment, except that it operates as described below in step S609 of the abnormality determination process shown in FIG. Operate. FIG. 19 is a flowchart showing an abnormality determination process according to the third embodiment.

That is, in the third embodiment, as shown in FIG. 19, when it is determined that the driving operation of the zoom lens 32 is not performed (step S303 = No), the minimum image plane movement coefficient K _min is changed. If it is determined that there is (step S308 = No), the process proceeds to step S609. In step S609, the camera control unit 21 determines whether the drivable range has been changed and whether a predetermined time has elapsed since the drivable range was changed.

For example, as shown in FIGS. 14A and 14B, when the drivable range is changed, the current lens position of the focus lens 33 may be outside the drivable range. In such a case, the lens control unit 36, while the return drive the focus lens 33, for repeatedly sending the current position image plane shift factor K _cur as the minimum image plane shift factor K _min, the focal point of the zoom lens 32 When the distance does not change, the minimum image plane movement coefficient K _min may change. Therefore, in the third embodiment, the camera control unit 21 changes the minimum image plane movement coefficient K _min until the predetermined time elapses after the drivable range is changed and the drivable range is changed. Even in the case where it is determined that there is no communication abnormality or the like between the camera body 2 and the lens barrel 3, the abnormality determination process shown in FIG. As a result, the abnormality process is not executed until a predetermined time elapses after the drivable range is changed.

The predetermined time is not particularly limited, but may be, for example, a time required for return driving, for example, 5 seconds. Further, the predetermined time is required for the focus lens 33 to drive from the drive region of the focus lens 33, that is, from the lens position of the infinity end soft limit SL _{IP to} the lens position of the closest end soft limit SL _NP. It can also be time. Furthermore, the predetermined time may be a time until the minimum image plane movement coefficient K _min changes a predetermined number of times (for example, five times).

  Furthermore, the predetermined time may be changed according to the current lens position of the focus lens 33. For example, the predetermined time can be increased as the distance from the current lens position of the focus lens 33 to the limit end of the drivable range is longer. The distance from the current lens position of the focus lens 33 to the limit end of the drivable range can be transmitted from the lens control unit 36 to the camera control unit 21 as lens information. Further, the number of drive pulses of the focus lens 33 may be used instead of the predetermined time. That is, in step S609, it can be configured that abnormality processing is not performed until the focus lens 33 drives a predetermined number of pulses after the drivable range is changed. Furthermore, the predetermined time can be changed according to the temperature and posture of the camera 1.

As described above, in the third embodiment, when the focal length of the zoom lens 32 is not changed, even if the minimum image plane movement coefficient _Kmin is changed, the drivable range is changed and the drive is performed. Until a predetermined time elapses after the possible range is changed, it is determined that no abnormality such as a communication abnormality has occurred between the camera body 2 and the lens barrel 3, and the abnormality process is not executed. Thereby, in the third embodiment, in addition to the effect of the first embodiment, it is appropriately determined whether or not an abnormality has occurred without determining whether or not the focus lens 33 exists inside the drivable range. Can be determined. Further, chattering can be effectively prevented by not executing the abnormality process until a predetermined time has elapsed from the time when the drivable range is changed.

  In step S609 of the third embodiment described above, instead of determining whether a predetermined time has elapsed since the drivable range was changed, it is determined whether the drivable range has been changed, If the drivable range is changed, it is determined that no abnormality such as a communication abnormality has occurred between the camera body 2 and the lens barrel 3, and the abnormality determination process shown in FIG. Good.

  In the above-described embodiment, the configuration in which the focus limit information is transmitted from the lens control unit 36 to the camera control unit 21 to determine whether or not the drivable range has been changed is illustrated, but the configuration is limited to this configuration. For example, it is possible to determine whether or not the drivable range has been changed as follows. That is, instead of the focus limit information, information on the number of divisions when the drive region of the focus lens 33 is divided into a plurality of sections may be transmitted from the lens control unit 36 to the camera control unit 21. For example, as shown in FIG. 6, the lens control unit 36 divides the drive area of the focus lens 33 into a plurality of sections (in the example shown in FIG. 6, nine sections D1 to D9). As shown in B), when the “infinity side limit mode” is set, the number of sections according to the driveable range (in the example shown in FIG. 6, “D4” to “D9”). 6 categories) can be transmitted to the camera control unit 21. Thereby, the camera control unit 21 can determine that the drivable range has been changed when the received number of sections changes. Further, the camera control unit 21 changes the drivable range by transmitting the distance from the current lens position of the focus lens 33 to the limit end of the drivable range as lens information from the lens control unit 36 to the camera control unit 21. It is good also as a structure which judges whether it was done.

<< 4th Embodiment >>
Next, a fourth embodiment 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. Specifically, the camera 1 according to the fourth embodiment is the same as the camera 1 according to the first embodiment, except that it operates as described below in step S709 of the abnormality determination process shown in FIG. Operate. FIG. 20 is a flowchart showing an abnormality determination process according to the fourth embodiment.

That is, in the fourth embodiment, when it is determined that the driving operation of the zoom lens 32 is not performed (step S303 = No), when it is determined that the minimum image plane movement coefficient _Kmin is changed. (Step S308 = No), the process proceeds to Step S709, and the camera control unit 21 determines whether the return drive is being executed. As described above, when the lens position of the focus lens 33 is outside the driveable range, the camera control unit 21 causes the lens control unit 36 to perform a return drive that moves the focus lens 33 to the inside of the driveable range. . Thus, if you are to perform the return driving, because the current position image plane shift factor K _cur is repeatedly transmitted as the minimum image plane shift factor K _min, such a change in the minimum image plane shift factor K _min Can be determined to be happening. Therefore, the camera control unit 21 does not perform communication abnormality between the camera body 2 and the lens barrel 3 when the return drive is performed even when the minimum image plane movement coefficient _Kmin is changed. It is determined that no abnormality has occurred, and the abnormality determination process shown in FIG.

  As described above, in the fourth embodiment, in addition to the effects of the first embodiment, whether or not the return driving is executed without determining whether or not the focus lens 33 exists inside the drivable range. It is possible to appropriately determine whether or not an abnormality has occurred.

  In the above-described fourth embodiment, the configuration in which the camera control unit 21 determines whether or not the return drive is performed is exemplified. However, the configuration is not limited to this configuration. It is possible to determine whether or not the lens position of the lens 33 is outside the drivable range, and to perform return driving when the lens position of the focus lens 33 is outside the drivable range. In this case, the camera control unit 21 can determine whether the return drive is being performed by receiving information indicating that the return drive is being executed from the lens control unit 36.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention. Moreover, each embodiment mentioned above can also be used in combination as appropriate.

For example, in the above-described embodiment, as the focus limit mode, the “FULL mode” in which the driveable range is not limited, the “closest limit mode” in which the closeable driveable range is limited, and the infinite drive range are limited. Although the configuration in which three modes of “infinity limit mode” are set is illustrated, the focus limit mode is not limited to the above example. For example, a mode may be provided in which a range from the lens position of the infinity side soft limit SL _{IS to} the lens position of the closest side soft limit SL _NS is set as the drivable range Rf4. Also in this case, when the current position image plane movement coefficient K _cur corresponding to the current lens position of the focus lens 33 is smaller than the minimum image plane movement coefficient K _min , the current position image plane movement coefficient K _{cur is set} to the minimum image plane movement. If the current position image plane movement coefficient K _cur corresponding to the current lens position of the focus lens 33 is larger than the maximum image plane movement coefficient K _max , the current position can be transmitted as the coefficient K _min to the lens barrel 3. the image plane shift factor K _cur can be transmitted to the lens barrel 3 as the maximum image plane shift factor K _max. For example, the current lens position of the focus lens 33 is in the region “D2”, the lens position on the most infinite side of the drivable range Rf4 is the region “D4”, and the lens position on the closest side is the region “D5”. In this case, the lens control unit 36 transmits the image plane movement coefficient “K15” of the lens position closest to the driveable range Rf4 among the image plane movement coefficients of the lens position areas D2 to D5 to the camera body 2. Minimum image plane movement which is determined as the maximum image plane movement coefficient K _max and transmits the smallest current position image plane movement coefficient K _cur “K12” among the image plane movement coefficients of the lens position regions D2 to D5 to the camera body 2 The coefficient is determined as K _min .
In the above-described embodiment, in step S105 of FIG. 12, the lens control unit 36 determines whether or not the “infinity limit mode” is set as the focus limit mode. However, the present invention is not limited to this. . For example, the step S105 of FIG. 12 is “a step S115 in which the lens control unit 36 determines whether the current lens position of the focus lens 33 is closer to the driveable range or infinity than the driveable range”. (Not shown) may be substituted. In this case, if it is determined in step S102 of FIG. 12 that the current lens position of the focus lens 33 is outside the drivable range, the process proceeds to step S115. In step S115, the lens control unit 36 confirms the focus limit mode. In the case of “FULL mode”, the lens position of the infinity end soft limit SL _{IP and} the lens position of the closest end soft limit SL _NP are read out as information of the focus limit mode, and the current lens position of the focus lens 33 is infinity. Whether or not the lens position of the end soft limit SL _IP is on the infinity side (whether it is on the infinity side of the driveable range), and is closer to the lens position of the near end soft limit SL _NP Whether it is closer to the driveable range or not. When it is determined that it is on the infinity side, the process proceeds to step S106 in FIG. 12, and when it is determined that it is on the near side, the process proceeds to step S108 in FIG.
Similarly, in the “close side limit mode”, whether or not the current lens position of the focus lens 33 is on the infinity side with respect to the lens position of the infinity end soft limit SL _IP , and the close side soft limit SL _NS It is determined whether or not it is closer to the lens position. When it is determined that it is on the infinity side, the process proceeds to step S106 in FIG. 12, and when it is determined that it is on the near side, the process proceeds to step S108 in FIG. Similarly, in the “infinity side limit mode”, whether or not the current lens position of the focus lens 33 is on the infinity side with respect to the lens position of the infinity side soft limit SL _IS , and the near end soft limit SL. It is determined whether or not the lens position is closer to the _NP lens position. When it is determined that it is on the infinity side, the process proceeds to step S106 in FIG. 12, and when it is determined that it is on the near side, the process proceeds to step S108 in FIG.
In the embodiment described above, an example in which the process proceeds to step S106 in FIG. 12 when it is determined that it is on the infinity side in step S115 and proceeds to step S108 in FIG. 12 when it is determined that it is on the near side. Although described, the present invention is not limited to this. For example, if it is determined in step S115 that the current lens position of the focus lens 33 is on the infinity side of the drivable range, driving is performed from the current lens position of the focus lens 33 instead of proceeding to step S106 in FIG. The step of determining the minimum image plane movement coefficient and the maximum image plane movement coefficient as the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max among the image plane movement coefficients up to the lens position closest to the possible range 116 (not shown) may be performed. If it is determined in step S115 that the current lens position of the focus lens 33 is closer to the driveable range, the focus lens 33 can be driven from the current lens position instead of proceeding to step S108 in FIG. Step of determining the minimum image plane movement coefficient and the maximum image plane movement coefficient as the minimum image plane movement coefficient K _min and the maximum image plane movement coefficient K _max among the image plane movement coefficients up to the lens position on the infinity side of the range 118 (not shown) may be performed. After steps 116 and 118, it is preferable to proceed to step 104 in FIG.
In the above-described embodiments, the image plane movement coefficient at the lens position closest to infinity is the minimum value, and the image plane movement coefficient at the lens position closest to the infinity is described as an example. It is not limited to. For example, the image plane movement coefficient at the lens position closest to the infinity may be the maximum value, and the image plane movement coefficient at the lens position closest to the infinity may be the minimum value. There may be a minimum value and a maximum value of the image plane movement coefficient at a position other than the closest lens position.
In the first embodiment and the like described above, the example in which the camera body 2 receives 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 from the lens barrel 3 has been described. However, the camera body 2 may receive from the lens barrel 3 the current position image plane movement coefficient _Kcur and at least one of the minimum image plane movement coefficient _Kmin and the maximum image plane movement coefficient _Kmax .
In the first embodiment and the like described above, the example in which the camera body 2 receives 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 from the lens barrel 3 has been described. The camera body 2 uses a lens mirror as a value near the current position image plane movement coefficient _Kcur and at least one of a value near the minimum image plane movement coefficient _Kmin and a value near the maximum image plane movement coefficient _Kmax. You may receive from the pipe | tube 3.
In the first embodiment and the like described above, an example in which the camera body 2 receives 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 from the lens barrel 3. has been described, the current position image plane shift factor K _cur, at least one of a camera body of the current position image plane shift factor K _cur following image plane shift factor and the current position image plane shift factor K _cur more image plane shift factor 2 may be received from the lens barrel 3.

Further, in the above-described embodiment, when the focus lens 33 is inside the drivable range, the smallest image plane movement coefficient among the plurality of image plane movement coefficients corresponding to the region within the drivable range is set to the minimum image. Although the configuration of transmitting to the camera body 2 is illustrated as the plane movement coefficient _Kmin , the configuration is not limited to this configuration. For example, the smallest image plane movement among a plurality of image plane movement coefficients corresponding to the region within the drivable range An image plane movement coefficient smaller than the coefficient may be transmitted to the camera body 2 as the minimum image plane movement coefficient _Kmin . For example, in the example shown in FIG. 13 (B), as the smallest image plane shift factor K14 mobile minimize image plane coefficient _{K min} of the image plane shift factor K14~K19 corresponding to each area D4~D9 drivable range Rf3 are transmitted to the camera body 2, but may be, for example, a configuration to transmit the image plane shift factor K13 smaller than the image plane shift factor K14 to the camera body 2 as the minimum image plane shift factor K _min. In this case, the camera control 21 has the minimum image plane movement coefficient K _min as the image plane movement coefficient K14 so that the in-focus position can be appropriately detected even at the lens position where the image plane movement coefficient K becomes the image plane movement coefficient K13. Compared to a certain case, the scanning speed V is set at a slower speed. Therefore, compared with the case where the minimum image plane movement coefficient K _min is the image plane movement coefficient K14, the calculation interval of the focus evaluation value is shortened, and accordingly, the calculation accuracy of the focus evaluation value can be increased.

In the embodiment described above, an example in which the position of the focus lens 33 corresponding to the minimum image plane movement coefficient K _min is closer to the position than the position of the focus lens 33 corresponding to the maximum image plane movement coefficient K _max will be described. However, it is not limited to this. For example, the position of the focus lens 33 corresponding to the minimum image plane movement coefficient _Kmin may be on the infinity side with respect to the position of the focus lens 33 corresponding to the maximum image plane movement coefficient _Kmax . For example, the image plane movement coefficient may be smaller as the position of the focus lens 33 is closer, the image plane movement coefficient may be larger as the position of the focus lens 33 is closer, or the closest. There may be a minimum value of the image plane movement coefficient or a maximum value of the image plane movement coefficient at a position other than the position of the focus lens 33 on the side and the position of the focus lens 33 on the most infinity side.

For example, the distance between the close focus position 480, the close soft limit position 460, the position of the mechanical end point 440 in the close direction, and the position of the mechanical end point 440 in the close direction from the close focus position 480 illustrated in FIG. The image plane movement coefficient at a position corresponding to at least one of the position and the position nearer than the position of the mechanical end point 440 in the closest direction is set to the minimum image plane movement coefficient K _min (or the maximum image plane movement coefficient K _max. ). Similarly, for example, the infinite focus position 470, the infinite soft limit position 450, the position of the mechanical end point 430 in the infinite direction, the position between the infinite focus position 470 and the position of the mechanical end point 430 in the infinite direction, and The image plane movement coefficient at a position corresponding to at least one of the positions on the infinite side of the position of the mechanical end point 430 in the infinite direction is also set as the maximum image plane movement coefficient K _max (or the minimum image plane movement coefficient K _min ). Good.

In addition, when the value of the optical minimum image plane movement coefficient K _min is, for example, a large number such as 102.345, 100 or 105 which is a value near 102.345 is set to the minimum image plane movement coefficient. You may memorize _| store as _Kmin . When 100 or 105 is stored in the lens memory 37, since the number of digits is smaller than when 102.345 is stored in the lens memory 37, the storage capacity of the memory can be saved, and the camera control unit 21 can store a second number described later. This is because the capacity of transmission data can be suppressed when transmitting the two coefficients K2 (K _min ).
Similarly, if the value of the optical maximum image plane movement coefficient K _max is a large number having a number of digits of 15354.67, for example, 1500 or a value in the vicinity of 15354.67 and having a smaller number of digits. 1535 may be stored as the minimum image plane movement coefficient _Kmin .
Similarly, the value of optical current position image plane shift factor _{K cur,} for example, if a large number of digits of 533.246, 530 the number of digits a value in the vicinity of 533.246 is small or 533 may be stored as the current position image plane movement coefficient _Kcur .

Further, the values of 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 may be values of optical image plane movement coefficients, or types of lens barrels In consideration of the drive mechanism of the focus lens 33, the detection mechanism of the focus lens 33, etc., the value may be set to a value larger or smaller than the value of the optical image plane movement coefficient.

DESCRIPTION OF SYMBOLS 1 ... Digital camera 2 ... Camera body 21 ... Camera control part 22 ... Imaging device 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 (9)

A camera body that can be attached to an interchangeable lens,
A receiving unit that receives from the interchangeable lens a first image plane movement coefficient that varies depending on a position on the optical axis of a focus optical system, and a second image plane movement coefficient that is equal to or less than a value of the first image plane movement coefficient;
When it is determined that the focus optical system is within the predetermined range, it is determined that the focus is not abnormal when the second image plane movement coefficient is changed, and when the focus optical system is determined not to be within the predetermined range, And a determination unit that does not determine that the second image plane movement coefficient is abnormal when the second image plane movement coefficient changes. The camera body according to claim 1,
The receiving unit receives a third image plane movement coefficient equal to or greater than a value of the first image plane movement coefficient;
The determination unit determines that the focus optical system is abnormal when the third image plane movement coefficient is changed when the focus optical system is within the predetermined range, and when the focus optical system is not within the predetermined range, A camera body, characterized in that it is not determined to be abnormal when the third image plane movement coefficient changes. The camera body according to claim 1 or 2,
The receiving unit receives predetermined information from the interchangeable lens,
The camera body characterized in that the determination unit determines whether or not the focus optical system is within the predetermined range using the predetermined information received by the reception unit. A camera body that can be attached to an interchangeable lens,
A first image plane movement coefficient that varies depending on a position on the optical axis of the focus optical system from the interchangeable lens, a second image plane movement coefficient that is equal to or less than a value of the first image plane movement coefficient, and the first image plane movement coefficient. A receiving unit that receives a third image plane movement coefficient equal to or greater than the value of the above, information on the position of the focus optical system, and information on the drive range of the focus optical system;
When it is determined that the focus optical system is within the drive range using the information about the position of the focus optical system and the information about the drive range of the focus optical system, the second image plane movement coefficient and the third image plane A camera body, comprising: a determination unit that determines that the movement coefficient is abnormal when at least one of the movement coefficients varies. A camera body according to claim 4,
When the determination unit does not determine that the focus optical system is within the drive range using the information related to the position of the focus optical system and the information related to the drive range of the focus optical system, the second image plane movement coefficient and A camera body characterized by not judging that it is abnormal even if at least one of the third image plane movement coefficients fluctuates. A camera body according to claim 4 or claim 5, wherein
The receiving unit receives information on the position of the variable magnification optical system,
When the determination unit determines that the variable magnification optical system is moving using information on the position of the variable magnification optical system, at least one of the second image plane movement coefficient and the third image plane movement coefficient A camera body characterized by not judging that it is abnormal even if fluctuates. A camera body according to any one of claims 4 to 6,
A control unit that generates a first drive control signal that drives the focus optical system to the inside of the drive range when the determination unit does not determine that the focus optical system is within the drive range;
A camera body, comprising: a transmission unit that transmits the drive control signal to the interchangeable lens. The camera body according to claim 7,
A calculation unit that calculates a focus position of the focus optical system using a contrast evaluation value;
The control unit generates a second drive control signal for driving the focus optical system to the in-focus position when the determination unit determines that the focus optical system is within the drive range, and the determination unit The camera body, wherein the second drive control signal is not generated when it is not determined to be within the drive range. Imaging apparatus characterized by having a camera body according to any one of claims 1-8.