JP2017156613A - Focus position adjustment controller and imaging system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a focus position adjustment controller capable of easily rewriting a correction value for an automatic focusing position, without removing an interchangeable lens from a camera body.SOLUTION: The focus position adjustment controller for adjusting the automatic focusing position in an imaging system (1) comprising a camera body (4) and an interchangeable lens unit (2) attached to the camera body and used includes a correction value acquisition part (18) which acquires a focusing correction value for the automatic focusing position in such a state that the interchangeable lens unit is attached to the camera body, a correction value storage part (16a) which is provided in the interchangeable lens unit and stores the focusing correction value, and a correction value update part (20) which updates the focusing correction value stored in the correction value storage part by using the correction value acquired by the correction value acquisition part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a focus position adjustment control device, and more particularly to a focus position adjustment control device for adjusting an automatic focus position in an imaging system including a camera body and an interchangeable lens unit attached to the camera body.

  Most of imaging devices such as digital cameras currently on the market have an automatic focusing (AF) function. As is well known, the AF function is a function for automatically detecting the position where the subject is in focus and automatically moving the focus lens to the in-focus position. Recent digital cameras have a high pixel count, and a photographed image is greatly extended at the photographing site so that the in-focus state can be confirmed, so that an extremely high-precision and high-speed AF function is required. As a focus detection technique for realizing high-speed AF, a pupil division method (phase difference AF) using a microlens is known.

  In an imaging apparatus that performs phase difference AF, the vignetting of the optical system may occur in the focus detection light beam that should be received by the photoelectric conversion unit, and the pair of image outputs obtained by pupil division may be non-uniform. If the pair of image outputs are non-uniform, the accuracy of the phase difference calculated by the correlation calculation is lowered, and accurate focus detection becomes difficult.

  In Patent Document 1 (Japanese Patent Laid-Open No. 2002-131623), a pair of image outputs when a uniform luminance surface is imaged by the same optical system is prepared in advance as reference data, and the pair of image outputs captured is used as reference data. There has been proposed an imaging apparatus that performs correction based on the above and detects a focal position using a pair of corrected image outputs. A camera that corrects the focus adjustment state is also disclosed in Japanese Patent Application Laid-Open No. 2013-145385. On the other hand, the correction value of the focus adjustment state is stored on the interchangeable lens side, and is attached directly to the interchangeable lens so that the user can rewrite the stored correction value as appropriate so that it fits the camera body to which the interchangeable lens is mounted. An apparatus for rewriting the correction value is also known.

JP 2002-131623 A JP 2013-145385 A

  However, in order to perform the phase difference AF with extremely high accuracy, both information on the lens side and information on the imaging device side are required. That is, it is information relating to the exit pupil position, pupil shape, aberration, and aperture at the time of photographing, the shape of the microlens on the imaging device side, the influence of aberration, and the like. In addition, since the reference data varies depending on the state of the optical system at the time of shooting, it is necessary to prepare a plurality of reference data for each state at the time of shooting. Here, the interchangeable lens imaging device is different from the lens-integrated imaging device, and the interchangeable lens is arbitrarily attached to an unspecified number of camera bodies. Therefore, the accuracy of AF may be reduced due to manufacturing errors and changes over time in use, in addition to the state of the camera body and the state of the interchangeable lens. Therefore, in order to perform highly accurate AF, it is necessary to correct according to each state. As a correction method, a method of directly writing the correction value on the interchangeable lens side and a method of holding the correction value on the camera body side can be considered.

  In the camera described in Patent Document 2 described above, individual correction values for each interchangeable lens are stored on the camera body side, and the mounted interchangeable lens is identified to correct the focus state. However, since an unspecified number of interchangeable lenses are arbitrarily attached to the camera body, there is a fundamental problem that correction cannot be performed unless the camera body supports correction for the attached interchangeable lens. . Furthermore, even if the camera body supports the correction of the focus state for the attached interchangeable lens, the exact focal position may vary from one interchangeable lens to another, and the proper focal position may vary depending on the user's preference. Therefore, there is a limit to the correction on the camera body side.

  On the other hand, when the correction value is directly stored on the interchangeable lens side, the correction is effective even when it is mounted on a large number of unspecified camera bodies. However, a currently known device for rewriting correction values stored in an interchangeable lens connects the interchangeable lens and a personal computer using an electrical contact for connecting the interchangeable lens and the camera body. When rewriting the correction value, it is necessary to remove the interchangeable lens from the camera body.

  That is, when the correction value is rewritten using this apparatus, the user first attaches the interchangeable lens to the camera body, performs imaging using the AF function, and confirms the captured image. If the user cannot be satisfied with the image focused by the AF function, the user once removes the interchangeable lens from the camera body, attaches it to the correction value rewriting device, and connects the interchangeable lens and the personal computer. Next, the user appropriately determines a correction value based on the captured image, and rewrites the correction value stored in the interchangeable lens via the personal computer. The user attaches the interchangeable lens to the camera body again, performs imaging using the AF function under the same conditions, and confirms the image. If the user is not satisfied with the captured image, the user repeats the above operation and adjusts the correction value until a satisfactory image is obtained. Furthermore, since the appropriate correction value varies depending on the state of the interchangeable lens, for example, the focus position (distance from the camera to the subject), the angle of view of the zoom lens, etc., there are a plurality of appropriate correction values for each state of the interchangeable lens. It is necessary to set. As described above, in the apparatus for rewriting the correction value stored in the currently known interchangeable lens, adjustment of the correction value takes a lot of labor and time, and the state of the interchangeable lens is kept strictly constant. However, there is a problem that the accuracy and reproducibility of the correction are reduced.

  The present invention has been made in view of the above problems, and in any camera body, it is possible to easily rewrite a correction value for an automatic focusing position without removing an interchangeable lens, and to improve focusing accuracy. With the goal.

  In order to solve the above-described problem, the present invention is a focal position adjustment control device for adjusting an automatic focusing position in an imaging system including a camera body and an interchangeable lens unit used by being attached to the camera body. A correction value storage unit that is provided in the interchangeable lens unit and stores a focus correction value that is used when adjusting the automatic focus position, and in a state where the interchangeable lens unit is mounted on the camera body, A correction value acquisition unit that acquires a correction value; and a correction value update unit that updates the in-focus correction value stored in the correction value storage unit using the correction value acquired by the correction value acquisition unit. It is characterized by.

  In the present invention configured as described above, the correction value is input from the outside of the imaging system to the correction value acquisition unit in a state where the interchangeable lens unit is mounted on the camera body. The input correction value is stored in a correction value storage unit provided in the interchangeable lens unit. The correction value update unit updates the in-focus correction value stored in the correction value storage unit using the acquired correction value.

  According to the present invention configured as described above, since the correction value storage unit is provided in the interchangeable lens unit, the correction for the automatic focusing position is performed regardless of the camera body to which the interchangeable lens unit is mounted. And the image quality of images taken by autofocus can be improved. Further, since the correction value acquisition unit can acquire the focus correction value in a state where the interchangeable lens unit is mounted on the camera body, the user can easily find an appropriate correction value.

  According to the present invention, it is possible to correct the autofocus position regardless of the mounted camera body, and it is possible to easily update the focus correction value without removing the interchangeable lens, and to improve the focus accuracy. Can be improved.

1 is a block diagram illustrating an imaging system including a focal position adjustment control device according to a first embodiment of the present invention. It is a graph which shows an example of the data for autofocus control with which the imaging system is equipped. It is a flowchart which shows the adjustment procedure of the automatic focusing position using the focus position adjustment control apparatus by 1st Embodiment of this invention. It is a figure which shows an example of the display screen for setting the correction value of the focus position adjustment control apparatus by 1st Embodiment of this invention. It is a flowchart which shows the adjustment procedure of the automatic focus position by the automatic adjustment mode in the focus position adjustment control apparatus by 1st Embodiment of this invention. It is a block diagram which shows the imaging system provided with the focus position adjustment control apparatus by 2nd Embodiment of this invention. It is a front view of the imaging system provided with the focus position adjustment control apparatus by 3rd Embodiment of this invention. It is a figure which shows typically the imaging system provided with the focus position adjustment control apparatus by 4th Embodiment of this invention.

<First Embodiment>
First, a focus position adjustment control device according to a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a block diagram illustrating an imaging system including a focal position adjustment control device according to a first embodiment of the present invention. FIG. 2 is a graph showing an example of autofocus (AF) control data provided in the imaging system. FIG. 3 is a flowchart showing an adjustment procedure of the automatic focus position using the focus position adjustment control device according to the present embodiment. FIG. 4 is a diagram illustrating an example of a display screen for setting a correction value of the focus position adjustment control device according to the present embodiment. FIG. 5 is a flowchart showing an adjustment procedure of the automatic focusing position in the automatic adjustment mode in the focal position adjustment control device of the present embodiment.

  As shown in FIG. 1, the imaging system 1 includes an interchangeable lens unit 2 and a camera body 4 on which the interchangeable lens unit 2 is mounted. When photographing is performed using the AF function by the imaging system 1, the camera body 4 detects the focus position based on the object light incident on the interchangeable lens unit 2, and a signal indicating the focus position is transmitted to the interchangeable lens unit 2. Output to. The interchangeable lens unit 2 moves the built-in focusing lens 12 based on the signal input from the camera body 4, and then the camera body 4 opens the shutter 28, and the focused image is converted into a solid-state image sensor 30. Formed on top. The focus position adjustment control device of the present embodiment corrects the signal representing the in-focus position input from the camera body 4 to move the focusing lens 12 to a more appropriate position and obtain a good image. Is.

  The interchangeable lens unit 2 includes a lens barrel 6, an imaging lens 8, a zooming lens 10, a focusing lens 12, a diaphragm 14, a lens control unit 16, and a data transmission / reception unit 18 that is a correction value acquisition unit. And a correction value update unit 20. Further, on the outer periphery of the lens barrel 6, a focus ring 6a for manually adjusting the focal point and a zoom ring 6b for adjusting the angle of view are provided. Further, the lens control unit 16 includes a storage unit 16a for storing AF basic data and a focus correction value, and a lens drive control circuit 16b for driving the focusing lens 12. Accordingly, the storage unit 16a functions as a correction value storage unit for storing the focus correction value. In the present embodiment, the focal position adjustment control device includes a data transmitting / receiving unit 18, a correction value updating unit 20, and a storage unit 16 a that are built in the interchangeable lens unit 2.

  The lens barrel 6 is a cylindrical member that holds an imaging lens 8, a zooming lens 10, and a focusing lens 12 therein. The focus ring 6a and the zoom ring 6b are annular members that are rotatably attached to the outer periphery of the lens barrel 6, respectively. When the user operates the focus ring 6a at the time of manual focus, the focusing lens 12 is moved in the optical axis direction, the focus position can be adjusted manually, and the zoom ring 6b is operated, The zooming lens 10 is moved in the optical axis direction so that the angle of view can be adjusted.

  The storage unit 16a built in the lens control unit 16 stores AF basic data and focus correction values. The lens drive control circuit 16b converts the lens drive signal transmitted from the camera body 4 through the electrical contact 2a of the mount portion of the interchangeable lens unit 2, the AF basic data and the focus correction value stored in the storage portion 16a. An automatic focusing position is calculated based on this, and the focusing lens 12 is moved to the focal point based on the calculation result.

  The data transmission / reception unit 18 is configured to be able to transmit and receive information wirelessly from a smartphone 22 that is a transmission device outside the imaging system 1. The data transmitting / receiving unit 18 acquires the correction value input to the smartphone 22 so that the captured image matches the user's intention, and the data is transmitted so as to match the data format stored in the storage unit 16a of the interchangeable lens unit 2. Perform the conversion. Note that dedicated application software for enabling transmission / reception to / from the data transmission / reception unit 18 is installed in the smartphone 22. When the user updates the focus correction value stored in the storage unit 16a, the focus correction value can be rewritten using application software started on the smartphone 22. In the present embodiment, information is exchanged between the data transmitting / receiving unit 18 and the smartphone 22 by NFC communication. In this way, by using wireless communication, it is not necessary to provide an additional electrical contact or the like outside the interchangeable lens unit 2, and the focus correction value can be set without impairing the operability and waterproofness of the interchangeable lens unit 2. Rewriting can be performed. In addition, the present invention can be configured to rewrite the focus correction value using a general-purpose wireless communication device other than the smartphone 22 or a dedicated wireless communication device.

  The correction value update unit 20 is configured to rewrite the focus correction value stored in the storage unit 16 a based on the correction value received by the data transmission / reception unit 18. That is, the correction value update unit 20 is configured to write the data acquired and converted by the data transmission / reception unit 18 to an appropriate location in the storage unit 16a for each focus position and zoom position.

  In the present embodiment, the correction value update unit 20 updates the focus correction value by rewriting the focus correction value stored in the storage unit 16a with the correction value received by the data transmitting / receiving unit 18 as an example. However, the present invention is not limited to this. For example, when the data transmission / reception unit 18 acquires a difference between the automatic focus position adjusted based on the focus correction value and a preferred automatic focus position as the correction value, the correction value update unit 20 The focus correction value may be updated by storing in the storage unit 16a a new focus correction value obtained by correcting the focus correction value using.

  The memory | storage part 16a, the data transmission / reception part 18, and the correction value update part 20 can be comprised with the antenna etc. for transmission / reception, a microprocessor, memory, and the software etc. which operate | move these, for example. The lens drive control circuit 16b can be constituted by an actuator that drives the focusing lens 12 based on a control signal from the microprocessor and a drive circuit thereof.

  The camera body 4 includes a lens mount 24, a mirror 26, a shutter 28, a solid-state imaging device 30, a phase difference detection unit 32, a body control unit 34, a display unit 36, an image information memory 38, and an operation unit. 40.

  The lens mount 24 is configured so that the interchangeable lens unit 2 can be attached to and detached from the camera body 4 with a simple operation, and is in contact with an electrical contact 2 a provided on the interchangeable lens unit 2 to input and output electrical signals. An electrical contact 24a is provided.

  The solid-state imaging device 30 is arranged on an imaging surface on which a light beam from a subject incident through the interchangeable lens unit 2 is imaged, and is configured to perform photoelectric conversion that outputs an electrical signal corresponding to the amount of light of the imaged image. Has been. In the present embodiment, the present invention is applied to a digital camera including the solid-state imaging device 30, but the present invention can also be applied to a film camera.

  The phase difference detection unit 32 is configured to reflect the light beam from the subject incident through the interchangeable lens unit 2 by the mirror 26 and output a pair of image outputs obtained by pupil division to the body control unit 34. .

  Furthermore, the body control unit 34 includes an image data generation unit 34a and an AF control unit 34b.

  The body control unit 34 is configured to control the entire imaging system 1. The AF control unit 34b built in the body control unit 34 calculates the focus adjustment state (defocus amount) of the interchangeable lens unit 2 based on the signal input from the phase difference detection unit 32, and according to the defocus amount. The lens driving signal is sent to the lens control unit 16 via the electrical contact 24a of the lens mount 24. This lens drive signal includes information indicating the drive amount for moving the focusing lens to the focal point. In the interchangeable lens unit 2, as described above, autofocus control is performed based on the lens drive signal. By moving the focusing lens 12 to the in-focus point, a light beam from a subject incident through the interchangeable lens unit 2 forms an image on the solid-state imaging device 30.

  The image data generation unit 34 a built in the body control unit 34 outputs image data based on a signal read from the image sensor provided in the solid-state image sensor 30 to the display unit 36, and the image data is stored in the image information memory 38. It is configured to be memorized.

  The operation unit 40 is an interface for inputting the user's intention to the body control unit 34. By operating this interface, operations such as display switching to the display unit 36 and enlargement / reduction of the displayed image are performed. It can be carried out.

  Next, with reference to FIG. 2, the AF control and the correction of the in-focus position in the embodiment of the present invention will be described.

  As described above, the phase difference detection unit 32 built in the camera body 4 acquires a pair of images obtained by pupil division, and the AF control unit 34b drives the lens according to the defocus amount obtained from the pair of images. The signal is sent to the lens control unit 16 of the interchangeable lens unit 2. The AF control data shown in FIG. 2 is data for calculating the amount of movement of the focusing lens 12 in the interchangeable lens unit 2 based on this lens drive signal.

  A curve a in FIG. 2 shows design data for calculating the amount of movement of the focusing lens 12. The design data is set based on aberration information / pupil position information in the design value of the interchangeable lens unit 2, and constitutes AF basic data. As shown in FIG. 2, the design data has different values depending on the object distance (distance from the subject to the imaging system). In normal AF control, the amount of movement of the focusing lens 12 is determined based only on this design data. However, in actuality, in the control of the focusing lens 12 based only on the design data, due to the effects of manufacturing errors of individual parts of the interchangeable lens unit 2, individual differences, errors included in the lens drive signal sent from the camera body 4, etc. A slight focus shift (defocus) occurs in the image formed on the solid-state imaging device 30, and the focus accuracy is lowered.

  For this reason, the design data is corrected at the time of shipment from the factory to reduce the influence of manufacturing errors and individual differences in each part of the interchangeable lens unit 2. Thus, the AF control data corrected at the time of factory shipment is a curve b in FIG. The focus correction value (difference between the curve a and the curve b) at the time of factory shipment also has a different value depending on the object distance, and a different correction value is set for each object distance.

  As described above, the influence of manufacturing errors and individual differences of the interchangeable lens unit 2 itself can be reduced by adjustment and correction at the time of shipment from the factory. However, the error included in the lens driving signal sent from the camera body 4 can be reduced. The impact cannot be dealt with. In addition, the focal position at which it feels that the subject is properly focused by autofocus may vary little by little depending on the subjectivity of the photographer. The focus position adjustment control device of this embodiment is for a user to correct such a shift of the focus position and obtain a good image. A curve c in FIG. 2 is an example of AF control data in which the focus correction value is set by the user in this way. This correction by the user also has a different value depending on the object distance, and a different correction value is set for each object distance.

In the above description, the AF control data is expressed as a function of only the object distance. However, when the interchangeable lens unit 2 is a zoom lens capable of changing the focal length, the AF control data is set. It also has different values depending on the focal length (the position of the zoom ring 6b: angle of view). Therefore, in practice, the AF control data D _AF is a function of the object distance f and the focal distance z, and this value is the design data D _D , each of which is a function of the object distance f and the focal distance z, The sum of the focus correction value A _B and the user's focus correction value A _U can be calculated by the following equation.

  Next, the procedure for setting the focus correction value by the user in the embodiment of the present invention will be described with reference to FIGS.

  First, in step S <b> 1 of FIG. 3, the user attaches the interchangeable lens unit 2 to be set with a focus correction value to the camera body 4. Next, in step S2, the user turns on the power of the camera body 4. When the power of the camera body 4 is turned on, communication is performed between the camera body 4 and the interchangeable lens unit 2, and various data are exchanged (step S3). Moreover, in step S3, communication confirmation is performed also between the data transmission / reception part 18 of the lens unit 2, and the smart phone 22 which is a transmission device.

  Next, in step S4, the user sets a predetermined shooting condition and then uses the AF function to shoot a subject. As shooting conditions, illumination light, a distance from the imaging system 1 to the subject (object distance), a field angle of shooting (focal length), and the like are set. That is, the user directs the imaging system 1 to a subject that is separated by an object distance for which a focus correction value is to be set, and adjusts the zoom ring 6b to an angle of view for which the focus correction value is to be set. It should be noted that it is preferable to select an object that is stationary and easy to check the in-focus state, and that the imaging system 1 is fixed with a tripod or the like.

  In step S5, the user checks the in-focus state of the image photographed in step S4. Specifically, the photographed image is displayed on the display unit 36 of the camera body 4, and it is checked whether or not the subject is in focus as intended at the time of photographing. Preferably, the operation unit 40 is operated to greatly enlarge the image displayed on the display unit 36, and the in-focus state of the details of the image is checked. When the user is satisfied with the in-focus state, it is not necessary to correct the automatic in-focus position, so the adjustment of the in-focus position is terminated. If the user is not satisfied with the in-focus state, the process proceeds to step S6.

  In step S <b> 6, the user uses the smartphone 22 to input a correction value as a new focus correction value for the automatic focus position. That is, the user determines how much the automatic focus position should be corrected to the front side or the rear side based on the image taken in step S4, and inputs the correction value. When inputting the correction value, the user installs dedicated application software in the smartphone 22 in advance so that data can be transmitted to and received from the data transmission / reception unit 18 built in the interchangeable lens unit 2. Keep it.

  FIG. 4 is an example of a screen displayed on the display unit of the smartphone 22 when the dedicated application software is activated. As described above, the focus correction value for correcting the autofocus position needs to be set for each object distance (shooting distance) and focal length (view angle) as necessary. In the present embodiment, as shown in FIG. 4, the object distance is divided into three regions (focus ranges 1 to 3), and the focal length is divided into four regions (zoom ranges 1 to 4). Correction values can be set (input) for each of the 12 regions by combination.

  When imaging is performed in a state where communication is established between the data transmission / reception unit 18 built in the interchangeable lens unit 2 and the smartphone 22, the data transmission / reception unit 18 displays the state of the interchangeable lens unit 2 at the time of shooting. Is transmitted to the smartphone 22. That is, the lens information acquisition unit incorporated in the lens drive control circuit 16b outputs the output value of the focus encoder (not shown) indicating the position information of the focusing lens 12 at the time of photographing in step S4, and the position of the zooming lens 10. An output value of a zoom encoder (not shown) representing information is acquired. The acquired output value of each encoder is transmitted to the smartphone 22 via the data transmitter / receiver 18. The smartphone 22 that has received these pieces of information determines to which of the areas shown in FIG. 4 the shooting in step S4 belongs. For example, the shooting in step S4 is a shooting of a subject at a shooting distance belonging to the focus range 2, and in this case, when the zoom ring 6b is set to a position belonging to the zoom range 3, it is shown in FIG. The “correction value 2-3” portion of the screen flashes.

  As a result, the user can confirm under which conditions the shooting performed in step S4 was performed, and when setting the correction value under the shooting conditions, the flashing portion of the screen is set. touch. When the blinking portion is touched, a focus correction value setting screen (not shown) is displayed, and the automatic focus position can be corrected in ± 20 steps by operating the screen. That is, correction values can be set in 20 steps for each of the front side and the rear side of the position where the focusing lens 12 is automatically focused. As described above, by setting the correction value based on the lens information automatically acquired by the lens information acquisition unit of the lens drive control circuit 16b, the shooting condition different from the shooting condition actually performed in step S4 is obtained. It is possible to prevent a mistake that a correction value is set.

  Next, in step S <b> 7, the correction value input by the user is transmitted from the smartphone 22 to the data transmission / reception unit 18. Further, in step S <b> 8, the correction value received by the data transmitting / receiving unit 18 is transferred to the correction value updating unit 20. In step S9, the correction value update unit 20 writes the transferred correction value in the storage unit 16a in association with the state of the interchangeable lens unit 2 acquired by the lens information acquisition unit. The correction value that can be set by the user is set to 0 (no correction by the user) as a default value, and the correction value update unit 20 newly sets the focus correction value stored in the storage unit 16a. Updates to the input correction value. Next, in step S10, the updated focus correction value is added to the focus correction value and design data set at the time of factory shipment, and the AF control data is updated. As a result, when shooting is performed under the same shooting conditions (the same focus range and zoom range) during subsequent shooting, autofocus is performed using the updated AF control data.

  After the correction value is input by the smartphone 22 and the focus correction value is updated, the user returns to step S4 again and performs shooting under the same shooting conditions. Further, in step S5, the user checks the newly captured image, and if the intended focus state is obtained, the adjustment is finished. If the focus state is still not satisfied, the focus correction amount is set. The procedure of steps S4 to S10 is repeatedly executed while changing. In addition, when setting the focus correction value under different shooting conditions (shooting conditions belonging to different focus ranges and / or zoom ranges), the user changes the shooting conditions in step S4 to perform steps S4 to S10. Follow the procedure. As described above, according to the present embodiment, since the focus correction value can be adjusted repeatedly without removing the interchangeable lens unit 2 from the camera body 4, an appropriate focus correction value can be obtained quickly. it can. Further, since the interchangeable lens unit 2 is not repeatedly attached and detached, it is possible to prevent the lens mount from being worn by many adjustments.

  Next, with reference to FIG. 5, the adjustment procedure of the automatic focusing position in the automatic adjustment mode will be described.

  The adjustment of the in-focus position described with reference to FIGS. 3 and 4 is performed by checking the image taken by the user, selecting the in-focus correction value by himself / herself and obtaining an input so that a satisfactory in-focus state can be obtained. However, in the adjustment in the automatic adjustment mode, the focus correction value is automatically generated by the focus position adjustment control device.

  First, in step S21 of FIG. 5, the user attaches the interchangeable lens unit 2 to be set with the focus correction value to the camera body 4, and turns on the power of the camera body 4. Next, in step S22, the user sets a predetermined shooting condition and then uses the AF function to shoot a subject.

  In step S23, the lens information acquisition unit of the lens drive control circuit 16b incorporated in the interchangeable lens unit 2 is a focus encoder that represents the automatic focusing position set in the photographing in step S22, that is, the position information of the focusing lens 12. Get the output value (not shown). That is, the lens information acquisition unit acquires the autofocus position set by autofocus as the state of the interchangeable lens unit 2. The acquired output value of the focus encoder is transmitted to the smartphone 22 in step S24.

  Next, in step S25, the user manually operates the focus ring 6a under the same shooting conditions as in step S22, and performs shooting in accordance with an appropriate in-focus position. In step S26, the lens information acquisition unit of the lens drive control circuit 16b acquires the output value of a focus encoder (not shown) set in the shooting in step S25. That is, the lens information acquisition unit acquires the manual focusing position manually adjusted by the user as the state of the interchangeable lens unit 2. The acquired output value of the focus encoder is transmitted to the smartphone 22 in step S27.

  In step S28, based on the output value of the focus encoder based on the auto focus transmitted in step S24 and the output value based on the manual focus transmitted in step S27, the application software installed in the smartphone 22 performs matching. The focus correction value is calculated and displayed on the display unit of the smartphone 22. Therefore, a microprocessor (not shown) built in the smartphone 22 operated by application software functions as a focus correction value generation unit that automatically generates a focus correction value. When the user confirms the focus correction value displayed on the display unit and touches an “OK” button (not shown), the calculated focus correction value is transmitted to the interchangeable lens unit 2, and the storage unit 16a. Is remembered. Also, if an abnormal focus correction value is calculated due to inadequate shooting conditions, etc., and displayed, the calculated focus correction value is discarded by touching a “Cancel” button (not shown). Then, the automatic focusing position can be newly adjusted again.

  In the flowchart shown in FIG. 5, the output value of the focus encoder is transmitted after shooting with autofocus, and the output value of the focus encoder is transmitted again after shooting with manual focus. It is also possible to configure the present invention so that the output values are collectively transmitted to the smartphone 22. Further, in the above-described embodiment, the output value of the focus encoder when shooting is performed with autofocus and manual focus is acquired. However, the output value of the focus encoder is in a state where only focusing is performed without shooting. The present invention can also be configured to obtain Furthermore, in the embodiment described above, the focus correction value is calculated by the application software installed in the smartphone 22, but the focus correction value is calculated by the lens drive control circuit 16b of the interchangeable lens unit 2, and the calculation result The present invention can be configured such that is displayed on the smartphone 22.

  In the above-described embodiment, the focus position adjustment control device is exclusively used for adjusting the automatic focus position, but the present invention is also configured so that other settings of the interchangeable lens unit 2 can be performed from the smartphone 22. Can also be configured. For example, the present invention can be configured so that the autofocus focusing speed can be set from the smartphone 22. Alternatively, when the interchangeable lens unit 2 has a camera shake correction function, the present invention can be configured so that the camera 22 can be used to input control parameters for camera shake correction control from the outside. In this case, the input control parameters are preferably stored in the storage unit 16a. Note that, as setting of camera shake correction control, setting of control parameters related to a control range of camera shake correction, a response speed of camera shake correction, and the like can be considered. The frequency of vibration due to camera shake varies among individuals, and by setting control parameters according to the user who uses the imaging system 1, more appropriate camera shake correction can be executed.

Second Embodiment
Next, with reference to FIG. 6, the focus position adjustment control apparatus by 2nd Embodiment of this invention is demonstrated.

  The focal position adjustment control device according to the second embodiment of the present invention is different from the first embodiment described above in that the correction value is input via the camera body. Accordingly, only the points of the present embodiment that are different from the first embodiment will be described here, and descriptions of similar configurations, functions, and effects will be omitted.

  FIG. 6 is a block diagram illustrating an imaging system including a focal position adjustment control device according to the second embodiment of the present invention. As shown in FIG. 6, the imaging system 100 includes an interchangeable lens unit 102 and a camera body 104 to which the interchangeable lens unit 102 is attached.

  The interchangeable lens unit 102 includes a lens barrel 106, an imaging lens 108, a zooming lens 110, a focusing lens 112, a diaphragm 114, and a lens control unit 116. Further, on the outer periphery of the lens barrel 106, a focus ring 106a for manually adjusting the focal point and a zoom ring 106b for adjusting the angle of view are provided. Further, the lens control unit 116 includes a storage unit 116a for storing AF basic data and a focus correction value, and a lens drive control circuit 116b for driving the focusing lens 112. Accordingly, the storage unit 116a functions as a correction value storage unit for storing the focus correction value.

  When the user operates the focus ring 106a, the focusing lens 112 is moved in the optical axis direction, the focusing position can be manually adjusted, and the zooming ring 110b is operated to operate the zooming lens 110. Is moved in the optical axis direction so that the angle of view can be adjusted.

  The storage unit 116a built in the lens control unit 116 stores AF basic data and a focus correction value. The lens drive control circuit 116b converts the lens drive signal transmitted from the camera body 104 through the electrical contact 102a of the mount portion of the interchangeable lens unit 102, the AF basic data and the focus correction value stored in the storage portion 116a. An automatic focusing position is calculated based on this, and the focusing lens 112 is moved to the focal point based on the calculation result.

  The camera body 104 includes a lens mount 124, a mirror 126, a shutter 128, a solid-state imaging device 130, a phase difference detection unit 132, a body control unit 134, a display unit 136, an image information memory 138, and an operation unit. 140.

  The lens mount 124 is provided with an electrical contact 124 a for making contact with the electrical contact 102 a provided in the interchangeable lens unit 102 and inputting and outputting electrical signals.

  The solid-state imaging device 130 is arranged on an imaging surface on which a light beam from a subject incident through the interchangeable lens unit 102 is imaged, and is configured to perform photoelectric conversion that outputs an electrical signal corresponding to the amount of light of the imaged image. Has been.

  The phase difference detection unit 132 is configured to reflect the light beam from the subject incident through the interchangeable lens unit 102 by the mirror 126 and output a pair of image outputs obtained by pupil division to the body control unit 134. .

  The operation unit 140 is an interface for inputting the user's intention to the body control unit 134. By operating this, the display unit 136 can be switched to display, the displayed image can be enlarged and reduced, and the like. It can be carried out.

  Furthermore, the body control unit 134 includes an image data generation unit 134a, an AF control unit 134b, a data input / output unit 118 that is a correction value acquisition unit, and a correction value update unit 120.

  In the present embodiment, the focal position adjustment control device includes a storage unit 116 a built in the interchangeable lens unit 102, a data input / output unit 118 built in the camera body 104, and a correction value update unit 120. It is configured.

  The body control unit 134 is configured to control the entire imaging system 100. The AF control unit 134b built in the body control unit 134 calculates the focus adjustment state (defocus amount) of the interchangeable lens unit 102 based on the signal input from the phase difference detection unit 132, and according to the defocus amount. The lens driving signal is sent to the lens control unit 116 via the electrical contact 124 a of the lens mount 124.

  The image data generation unit 134 a built in the body control unit 134 outputs image data based on a signal read from the imaging sensor provided in the solid-state imaging device 130 to the display unit 136, and the image data is stored in the image information memory 138. It is configured to be memorized.

  The data input / output unit 118 is configured to acquire a correction value input by the operation unit 140 of the camera body 104. The data input / output unit 118 acquires the correction value input from the operation unit 140 so that the captured image matches the user's intention, and matches the data format stored in the storage unit 116a of the interchangeable lens unit 102. , Convert data. When the focus correction value stored in the storage unit 116a is updated, the focus correction value input screen is displayed on the display unit 136 of the camera body 104, and the user operates the operation unit 140 according to the display screen. By operating, it is possible to input a correction value and rewrite the focus correction value already stored. In addition, the present invention can be configured such that the display unit is configured by a touch panel and the user can input the correction value by directly touching the display unit.

  The correction value update unit 120 is configured to rewrite the focus correction value stored in the storage unit 116 a of the interchangeable lens unit 102 based on the new correction value acquired by the data input / output unit 118. That is, the correction value update unit 120 is configured to write the data acquired and converted by the data transmission / reception unit 118 to an appropriate location in the storage unit 116a for each focus position and zoom position.

  Next, the procedure for setting the focus correction value by the user in the embodiment of the present invention will be described.

  The procedure for setting the focus correction value in the present embodiment is the same as that in the first embodiment described with reference to FIGS. 3 and 4, but the following points are different from those in the first embodiment. First, the communication confirmation in step S3 in FIG. 3 is performed only between the interchangeable lens unit 102 and the camera body 104 in the present embodiment. 3 is performed by operating the operation unit 140 of the camera main body 104, and the input correction value is acquired by the data input / output unit 118 incorporated in the camera main body 104. (Step S7). Further, the acquired correction value is transferred to a correction value update unit 120 built in the camera body 104, and the correction value update unit 120 passes through the electrical contact 124 a of the lens mount 124 and the electrical contact 102 a of the interchangeable lens unit 102. Then, the focus correction value stored in the storage unit 116a is rewritten (steps S8 and S9).

  Further, in the present embodiment, the input screen for the focus correction value shown in FIG. 4 is displayed on the display unit 136 of the camera body 104, and the correction value corresponding to the state of the interchangeable lens unit 102 is input. Can be done.

  Further, the adjustment of the automatic focusing position in the automatic adjustment mode in the present embodiment is the same as the adjustment in the first embodiment described with reference to FIG. In the present embodiment, communication between the interchangeable lens unit and the smartphone in steps S24, S27, and S28 in FIG. 5 is performed between the interchangeable lens unit 102 and the camera body 104. In the present embodiment, the focus correction value generation unit that automatically generates the focus correction value is built in the lens control unit 116 of the interchangeable lens unit 102.

  According to the focal position adjustment control device of the second embodiment of the present invention, the focus correction value stored in the interchangeable lens unit 102 can be input via the operation unit 140 of the camera body 104. The focus correction value can be adjusted without providing any special communication means. Further, according to the focus position adjustment control device of the present embodiment, since the focus correction value is stored on the interchangeable lens unit side, it is possible to correspond to the adjustment of the focus correction value for an extremely large number of interchangeable lens units.

<Third Embodiment>
Next, with reference to FIG. 7, the focus position adjustment control apparatus by 3rd Embodiment of this invention is demonstrated.

  The focal position adjustment control device according to the third embodiment of the present invention is different from the first embodiment described above in that the correction value is directly input to the interchangeable lens unit via the connection cable. Accordingly, only the points of the present embodiment that are different from the first embodiment will be described here, and descriptions of similar configurations, functions, and effects will be omitted.

  FIG. 7 is a front view of an imaging system including a focal position adjustment control device according to a third embodiment of the present invention.

  As illustrated in FIG. 7, the imaging system 200 including the focal position adjustment control device according to the present embodiment includes an interchangeable lens unit 202 and a camera body 204.

  In the first embodiment described above, transmission / reception is performed wirelessly between the data transmission / reception unit 18 of the interchangeable lens unit 2 and the smartphone 22, but in the present embodiment, data transmission / reception built in the interchangeable lens unit 202 is performed. (Not shown) and an external terminal device 222 which is a transmission device are connected by a connection cable 222a which is a signal line.

  A connector 202a having an electrical contact is provided at the lower side of the lens barrel of the interchangeable lens unit 202, and a connection cable 222a is connected thereto. In the present embodiment, since the connector 202a is provided at such a position, the data transmission / reception unit (not shown) and the external terminal device 222 are mounted with the interchangeable lens unit 202 mounted on the camera body 204. Can send and receive data. As shown in FIG. 7, the connector 202a to which the connection cable 222a is connected is preferably provided on the side surface of the lens barrel, and the central angle on the side surface is 0 ° on the right side in the horizontal direction of the optical axis when viewed from the subject side. Provide within a range of ± 135 °. In general, a release button 204 a is provided on the right side of the camera body 204 as viewed from the photographer side, and the photographer grips the right side surface of the camera body 204. For this reason, if the connector 202a is provided on the right side surface (left side surface when viewed from the subject side) of the interchangeable lens unit 202, it may be difficult to hold the camera body 204 or communication with an external device may be hindered. By providing the connector 202a in the range of the central angle ± 135 ° with the right side of the optical axis in the horizontal direction as 0 °, such a harmful effect can be avoided.

  The external terminal device 222 is an electronic device that is connected to the interchangeable lens unit 202 via the connection cable 222a and exchanges data. The external terminal device 222 can be configured by installing dedicated application software in a general-purpose electronic device such as a personal computer or a tablet computer. Alternatively, the external terminal device 222 can be configured by a dedicated electronic device that can transmit and receive with the interchangeable lens unit 202.

  The focus position adjustment control device of this embodiment is the same as that of the first embodiment except that the interchangeable lens unit 202 and the external terminal device 222 are connected via a connection cable 222a. According to the focal position adjustment control device of the present embodiment, the interchangeable lens unit 202 and the external terminal device 222 are connected by the connection cable 222a, so that bidirectional data exchange can be reliably performed.

<Fourth embodiment>
Next, a focus position adjustment control device according to a fourth embodiment of the present invention will be described with reference to FIG.

  FIG. 8 is a diagram schematically illustrating an imaging system 300 including the focal position adjustment control device of the present embodiment. In the present embodiment, the same components as those in the imaging system 1 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted here.

  In the above-described first embodiment, the imaging system 1 is configured to exchange information regarding correction values between the interchangeable lens unit 2 and the smartphone 22, but in the imaging system 300 according to the present embodiment, these are the configurations. The following functions are added by performing wireless communication between the two.

  First, in the present embodiment, information on an image to be captured (that is, an image captured by the imaging system 300) formed on the solid-state imaging device 30 of the camera body 4 is data stored in the interchangeable lens unit 2. It is transmitted to the smartphone 22 via the transmission / reception unit 18. The user adjusts the in-focus position by operating the smartphone 22 while confirming the image displayed on the screen of the smartphone 22 based on the information of the image to be captured transmitted from the data transmitting / receiving unit 18.

  The smartphone 22 transmits to the interchangeable lens unit 2 a control signal indicating the adjustment of the in-focus position received by the user's operation of the smartphone 22. The lens drive control circuit 16 b built in the interchangeable lens unit 2 moves the focusing lens 12 based on a control signal transmitted from the smartphone 22 and received by the data transmitting / receiving unit 18. Thereby, even if the imaging system 300 is installed at a remote location, the user can perform focus adjustment while confirming the image of the smartphone 22.

  That is, the focus position adjustment control device according to the present embodiment is a focus position adjustment control for adjusting the automatic focus position in the imaging system 300 including the camera body 4 and the interchangeable lens unit 2 attached to the camera body 4 and used. A storage unit 16a (correction value storage unit) that is provided in the interchangeable lens unit 2 and stores an in-focus correction value that is used when adjusting the automatic in-focus position; 4, the data transmission / reception unit 18 (correction value acquisition unit) that acquires a correction value for the automatic focus position and the focus correction value stored in the storage unit 16 a are acquired by the data transmission / reception unit 18. A correction value update unit 20 that corrects using the corrected correction value, and displays an image captured by the imaging system 300 via the data transmission / reception unit 18. Transmits the data to the outside via the data transceiver unit 18 obtains a correction value that is generated based on the images captured.

  Here, as described above, the “correction value generated based on the image to be captured” means that the user selects the external terminal while referring to the image to be captured displayed on the external terminal such as the smartphone 22, for example. A control signal indicating the adjustment of the in-focus position performed by the operation.

  According to the above configuration, the focus position adjustment control device according to the present embodiment transmits the image to be captured to the outside (for example, the smartphone 22) and moves the focusing lens based on the control signal acquired from the outside. Can be made. According to this, the external device including the display such as the smartphone 22 that has received the data indicating the image to be captured transmitted from the focus position adjustment control device can display the image to be captured on the display based on the data. it can. Then, the user operates the smartphone 22 based on the image to be captured displayed on the display so that the focus position is adjusted, and the focus position adjustment control device receives a control signal from the smartphone 22 that has received the user's operation. By receiving, the focus position adjustment control device can adjust the focus position as desired by the user. That is, the user can adjust the in-focus position in the interchangeable lens unit of the imaging system from a location away from the imaging system.

  In other words, the focus position adjustment control device according to the present embodiment is configured to be able to wirelessly transmit an image to be captured to the external terminal device, and manually synchronizes with the control signal transmitted from the external terminal device. The focal position can be adjusted.

  Further, in the present embodiment, it is possible to previously shoot a shooting sequence in the smartphone 22 and perform shooting according to the sequence at a predetermined timing. For example, when the distance from the imaging system 1 to the subject is known in advance, a plurality of in-focus points to be shot are set as a shooting sequence. When the user operates the smartphone 22 at a timing at which the shooting sequence should be executed, shooting is performed at the first focus point of the shooting sequence. When shooting at the first focus point is completed, the focusing lens 12 of the interchangeable lens unit 2 is automatically moved to the second focus point in the shooting sequence. The user operates the smartphone 22 at a desired timing while checking the display screen, and performs shooting at the second focus point. When shooting at the second focus point is completed, the focusing lens 12 is automatically moved to the third focus point of the shooting sequence, and the user performs shooting at the third focus point. . This operation is repeated until the preset imaging sequence is completed.

  Further, in the present embodiment, the user can finely adjust the autofocus position by autofocus by manual operation. First, when the user operates the smartphone 22, focus adjustment is performed by autofocus, and an image that has been subjected to focus adjustment is displayed on the display screen of the smartphone 22. The user operates the smartphone 22 while monitoring the display screen, finely corrects the position automatically focused manually, and takes a picture when a desired focus is obtained. According to the present embodiment configured as described above, fine focus adjustment for each subject can be performed according to the taste of the photographer.

  Furthermore, in this embodiment, by operating the smartphone 22, it is possible to adjust the effectiveness of the camera shake correction control. First, when the user operates the smartphone 22, camera shake correction control is started in the imaging system 300, and an image formed by the camera shake correction is transmitted to the smartphone 22. That is, in a normal imaging system, the release button is half pressed. The user operates the smartphone 22 while checking the image monitored by the smartphone 22 and sets the effect amount of the camera shake correction control. For example, the movable range of a camera shake correction lens (not shown) can be set as a control parameter for camera shake correction control. By setting the movable range large, the shake of the image (image formed on the viewfinder) monitored on the smartphone 22 is strongly suppressed, and the image becomes more stationary. However, in this state, the possibility that the shake of the photographed image is completely corrected decreases. On the other hand, if the movable range is set to be small, the image to be monitored is easily shaken, but the possibility that the shake of the photographed image is sufficiently corrected increases.

  In the above-described embodiment, the imaging system 300 is operated by the smartphone 22, but the present invention can also be configured so that the operation can be performed by another electronic device capable of wireless communication. For example, a personal computer, a tablet computer, a dedicated remote controller, or the like can be used as the external terminal device.

  Further, in the present embodiment, the configuration in which communication is performed between the interchangeable lens unit 2 and the smartphone 22 has been described as an example. However, the configuration is not limited thereto, and for example, between the camera body 4 and the smartphone 22. The above-described functions may be realized by performing communication.

  As mentioned above, although preferable embodiment of this invention was described, a various change can be added to embodiment mentioned above.

DESCRIPTION OF SYMBOLS 1 Imaging system 2 Interchangeable lens unit 2a Electrical contact 4 Camera body 6 Lens barrel 6a Focus ring 6b Zoom ring 8 Imaging lens 10 Zooming lens 12 Focusing lens 14 Aperture 16 Lens control unit 16a Storage unit (correction value storage unit)
16b Lens drive control circuit 18 Data transmission / reception unit (correction value acquisition unit, transmission unit)
20 Correction value update unit 22 Smartphone (transmission device)
Reference Signs List 24 lens mount 24a electrical contact 26 mirror 28 shutter 30 solid-state imaging device 32 phase difference detection unit 34 body control unit 36 display unit 38 image information memory 40 operation unit 100 imaging system 102 interchangeable lens unit 102a electrical contact 104 camera body 106 lens barrel 106a Focus ring 106b Zoom ring 108 Imaging lens 110 Zooming lens 112 Focusing lens 114 Aperture 116 Lens control unit 116a Storage unit 116b Lens drive control circuit 118 Data input / output unit (correction value acquisition unit, transmission unit)
120 Correction value update unit 124 Lens mount 124a Electrical contact 126 Mirror 128 Shutter 130 Solid-state imaging device 132 Phase difference detection unit 134 Body control unit 134a Image data generation unit 134b AF control unit 136 Display unit 138 Image information memory 140 Operation unit 200 Imaging system 202 Interchangeable lens unit 202a Connector 204 Camera body 204a Release button 222 External terminal device (transmitting device)
222a Connection cable (signal line)
300 Imaging system

Claims (10)

A focus position adjustment control device for adjusting an automatic focusing position in an imaging system including a camera body and an interchangeable lens unit used by being attached to the camera body,
A correction value storage unit that is provided in the interchangeable lens unit and stores a focus correction value used when adjusting the automatic focusing position;
In a state where the interchangeable lens unit is mounted on the camera body, a correction value acquisition unit that acquires a correction value for the automatic focusing position;
A correction value update unit that updates the in-focus correction value stored in the correction value storage unit using the correction value acquired by the correction value acquisition unit;
And a focal position adjustment control device.   The focal position adjustment control device according to claim 1, wherein the correction value acquisition unit and the correction value update unit are built in the interchangeable lens unit.   The focal position adjustment control device according to claim 1, wherein the correction value acquisition unit acquires the correction value by wireless communication from outside the imaging system.   The focal position adjustment control device according to claim 1, wherein the correction value acquisition unit acquires the correction value from the outside of the imaging system via a signal line. A lens information acquisition unit that automatically acquires the state of the interchangeable lens unit;
The correction value storage unit stores the correction value acquired by the correction value acquisition unit in association with the state of the interchangeable lens unit acquired by the lens information acquisition unit. The focal position adjustment control device according to the item. A lens information acquisition unit that automatically acquires the state of the interchangeable lens unit; and a focus correction value generation unit that generates the correction value;
The lens information acquisition unit acquires a manual focus position that is a focus position manually adjusted by a user as a state of the interchangeable lens unit,
The focus position adjustment control device according to claim 1, wherein the focus correction value generation unit generates the correction value based on the manual focus position and the automatic focus position.   The connection terminal for connecting the signal line to the correction value acquisition unit is provided on the side surface of the lens barrel of the interchangeable lens unit, and the connection terminal is located on the right side in the horizontal direction of the optical axis when the interchangeable lens unit is viewed from the subject side. 5. The focus position adjustment control device according to claim 4, wherein the focus position adjustment control device is provided within a range of a central angle of ± 135 °, where 0 is 0 °. The imaging system has a camera shake correction function,
The correction value acquisition unit is configured to be able to acquire control parameters for camera shake correction control from the outside, and the correction value storage unit is configured to be able to store the acquired control parameters. The focal position adjustment control apparatus according to any one of the above. A transmission unit for transmitting data indicating an image captured in the imaging system to the outside;
The focal position adjustment control device according to any one of claims 1 to 8, wherein the correction value acquisition unit acquires a correction value generated based on the captured image. The camera body,
A lens unit attached to the camera body,
The focal position adjustment control device according to any one of claims 1 to 9,
An imaging system.

Images