JP2012068457A - Imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce communication traffic volume of information required for driving means for driving a photographic lens during wobbling.SOLUTION: In the imaging apparatus, a lens unit 150 is exchangeable. The direction of a focusing position is determined by wobbling a photographing optical system 152 in the optical axis direction by use of driving means 155, and the photographing optical system is moved in that direction via the driving means. The imaging apparatus includes: an imager 110 that carries out electric charge accumulation and reading per pixel line in synchronization with a first vertical synchronization signal VD1; and control means 130 for controlling the drive of the photographing optical system by the driving means during wobbling following a second vertical synchronization signal VD2 by generating the second vertical synchronization signal VD2 delayed from the first vertical synchronization signal and transmitting it to the lens unit 150.

Description

  The present invention relates to an imaging apparatus.

  In an imaging apparatus, it is known to determine the direction in which the in-focus position is located by moving the lens in the optical axis direction (wobbling) during contrast-type autofocus (AF: automatic focus adjustment). When the image sensor is a CMOS sensor, rolling readout is performed, the lens is stopped during charge accumulation, and the lens is moved during readout.

  Patent Document 1 proposes a method of changing a lens driving period based on a result of comparing a lens driving period and a charge accumulation period of an AF area (AF frame) that is a focus adjustment target area. Patent Document 2 proposes a method of changing the frequency of the synchronization signal for the lens.

JP 2008-111995 A JP 2004-286780 A

  The AF area setting includes one-point AF, multi-point AF, face AF, and the like. For one-point AF, the AF area is set to an arbitrary point. Alternatively, it can be regarded as one-point AF when it is set in a narrow area of the screen. In multi-point AF, the AF area is set to all AF points over a wide range of the screen, or set to AF points that frequently switch. In face AF, the AF area is switched according to the face detection result. In the multipoint AF and face AF, the AF area is frequently changed. However, in the method of Patent Document 1, it is necessary to instruct the lens driving means to start and end the lens driving period. Therefore, a high-cost communication environment called high-speed communication must be prepared.

  Accordingly, an object of the present invention is to provide an imaging apparatus capable of suppressing the amount of information necessary for driving means for driving a photographing lens during wobbling.

  An imaging apparatus according to one aspect of the present invention is configured such that a photographing optical system and a lens unit having a driving unit that drives the photographing optical system can be exchanged, and the photographing optical system is wobbled in the optical axis direction by the driving unit. An imaging device that discriminates a direction in which the in-focus position is present and moves the imaging optical system in the direction via the driving unit, and stores and reads out charges in synchronization with a first vertical synchronization signal. In the imaging device performed in units of rows and the wobbling, a second vertical synchronization signal delayed from the first vertical synchronization signal is generated, and the second vertical synchronization signal is transmitted to the lens unit. And control means for controlling the driving of the photographing optical system by the driving means in accordance with the second vertical synchronizing signal.

  ADVANTAGE OF THE INVENTION According to this invention, the imaging device which can suppress the communication amount of the information required for the drive means which drives a taking lens at the time of wobbling can be provided.

6 is a timing chart of charge accumulation and wobbling. Example 1 6 is a timing chart of charge accumulation and wobbling. (Example 2) 6 is a timing chart of charge accumulation and wobbling. (Example 3) It is a block diagram of the imaging device of a present Example.

  FIG. 4 is a block diagram illustrating the configuration of the imaging apparatus according to the present exemplary embodiment, and a broken line represents an optical axis of an imaging optical system (imaging lens) 152 described later. The imaging apparatus of the present embodiment is a lens interchangeable digital single-lens reflex camera, but the type of imaging apparatus such as a digital video camera is not limited.

  The imaging apparatus also has an automatic focus adjustment function (AF function) that determines the in-focus direction where the in-focus position (contrast peak position) is located by performing wobbling that slightly moves the imaging optical system in the optical axis direction.

  The imaging apparatus includes a main body 100 and a lens unit (exchangeable lens) 150 that is replaceably attached to the main body 100, and the lens unit 150 is configured to be replaceable. Mechanical attachment / detachment of the main body 100 and the lens unit 150 is performed via the mount of the main body 100 and the mount of the lens unit 150. In addition, the electrical connection and disconnection between the main body 100 and the lens unit 150 are performed via the connector of the main body 100 and the connector of the lens unit 150.

  The main body 100 includes a sub mirror 105, a focus detection unit 107, an image sensor 110, a signal processing circuit 120, a display unit 124, a subject detection unit 126, a setting unit 128, a camera microcomputer (control unit) 130, a memory 140, and other members. Have.

  The sub mirror 105 is disposed so as to be inserted into and retracted from the optical path together with a main mirror (half mirror) (not shown). FIG. 4 shows a mirror-down state when not photographing. In the mirror-down state, the main mirror reflects a part of the incident light beam to the optical finder (not shown) and transmits a part to the sub mirror 105, and the sub mirror 105 reflects the incident light beam to the focus detection unit 107. Further, at the time of photographing, the main mirror and the sub mirror 105 move to a position retracted from the optical path (mirror up), and guide the incident light flux to the image sensor 110.

  The focus detection unit 107 receives the light beam reflected by the sub mirror 105 by a sensor that performs photoelectric conversion disposed inside. The defocus amount is obtained using the phase difference method by calculating the output of the sensor. The camera microcomputer 130 evaluates the calculation result and instructs the lens microcomputer 160 to move the focus lens by a predetermined amount.

  The image sensor (image sensor) 110 converts an optical image formed by the imaging optical system into an electrical signal (image data), and scans charge accumulation and readout in units of pixel rows or columns (that is, rolling). (Performs) an imaging device, which is composed of, for example, a CMOS sensor. That is, in the image sensor 110, only one row is accumulated at the same time, another row is accumulated with a delay in time, and the accumulation-completed row is read during accumulation of another row. Image data from the image sensor 110 is input to the signal processing circuit 120 via the AGC / AD circuit. Accumulation and readout of the electric charge of the image sensor 110 are performed in synchronization with the first vertical synchronization signal VD1 as will be described later.

  The signal processing circuit 120 is connected to the image sensor 110 and the camera microcomputer 130, and performs processing including filter processing, color conversion processing, and gamma processing compression processing on the digitized image data from the image sensor 110. Send to. The image data processed as a display image by the signal processing circuit 120 is sent to the display means driving circuit 122 and displayed as an image on the display means 124 such as an electronic viewfinder.

  The subject detection means 126 detects a subject (such as a face) that satisfies a certain condition. When the subject detection unit 126 functions as a face detection unit, face AF can be performed.

  The setting unit 128 includes a mode dial and various operation members, and sets a live view mode in which image data is continuously output from the image sensor 110 and image data is continuously displayed on the display unit 124. The setting unit 128 can also set a face AF mode in which face detection is performed by the subject detection unit 126. Furthermore, the setting unit 128 can set a one-point AF mode and a multi-point AF mode.

  In addition, the imaging apparatus can be regarded as fixing the AF area, which is a focus adjustment target area (that is, the AF area has a small fluctuation), and the AF area has a plurality of AF areas and the AF area varies. And a second mode in which the AF region varies greatly. The first mode is, for example, a one-point AF or a narrow area AF mode. The second mode is, for example, a face AF mode in which the subject detection unit 126 performs multipoint AF and face detection.

  The camera microcomputer 130 is a microcomputer (control means, processor) connected to the image sensor 110 and the signal processing circuit 120 and connected to the lens microcomputer 160 of the lens unit 150 via a connector (not shown). The camera microcomputer 130 performs AF control including wobbling and image processing control.

  The memory 140 holds information necessary for contrast AF.

  The main body 100 of the imaging apparatus has an automatic focus adjustment function that determines the direction in which the in-focus position is located by wobbling the photographic optical system in the optical axis direction, and moves the photographic optical system through the driving means in the direction. This function is used in an imaging device in which the lens unit is configured to be replaceable, and has an effect of suppressing the amount of communication between the main body and the lens unit.

  In wobbling, after the lens is finely driven to an infinite position, the focus lens is first stopped and an image is captured from the image sensor 110. Next, after the focus lens is finely driven to the closest position, the lens is stopped and an image is captured from the image sensor 110.

  After determining the in-focus direction, the camera microcomputer 130 performs contrast AF by moving the focus lens of the photographing optical system in the in-focus direction. That is, the camera microcomputer 130 detects the peak position of the contrast (AF evaluation value) of the image data output from the image sensor while performing scanning that changes the relative position between the focus position formed by the focus lens and the image sensor. Do.

  The lens unit 150 includes a photographing optical system 152 that forms an optical image of a subject, a driving circuit (driving means) 155 that moves a focus lens of the photographing optical system 152 in the optical axis direction, and a lens microcomputer 160.

  The photographing optical system 152 includes a plurality of lenses that collect an optical image of a subject on the image sensor 110. Some of the plurality of lenses include a focus lens that is moved in the optical axis direction during focus adjustment.

  The drive circuit 155 includes a DC motor and a stepping motor, and moves the focus lens of the photographing optical system 152 in the optical axis direction under the control of the lens microcomputer 160.

  The lens microcomputer 160 is electrically connected to the camera microcomputer 130 and exchanges information necessary for the photographing operation. The connection between the lens microcomputer 160 and the camera microcomputer 130 includes a data line DL for performing bidirectional data communication and a vertical synchronization signal VD output from the camera microcomputer 130 to the lens microcomputer 160. The camera microcomputer 130 continuously transmits the vertical synchronization signal VD to the lens microcomputer 160.

  In contrast AF, the focus lens is moved from the current position to the peak position (focus position) of the contrast value. In order to determine the direction of the focus position from the current position of the focus lens, the focus lens is moved in the optical axis direction. Wobbling back and forth along.

  In this way, the camera microcomputer 130 moves the focus lens from the current position to the front side and the rear side, acquires the contrast value (AF evaluation value) at each position from the signal processing circuit 120 and stores it in the memory 140. Thereafter, the camera microcomputer 130 compares the AF evaluation values stored in the memory 140 and determines that the direction in which the AF evaluation value increases is the direction where the in-focus position is. Thereafter, the camera microcomputer 130 moves the focus lens in the direction where the in-focus position is located.

  At the time of wobbling, the main mirror and the sub mirror 105 are retracted from the optical path, the light beam is guided to the image sensor 110, the shutter (not shown) is opened, and images are continuously read from the image sensor 110 by a rolling readout method. Further, the camera microcomputer 130 transmits a command for driving the focus lens back and forth to the lens microcomputer 160. In response to this command, the lens microcomputer 160 issues an output signal for causing the drive circuit 155 to drive the focus lens.

  Hereinafter, operations of the camera microcomputer 130 and the lens microcomputer 160 during wobbling will be described. This operation flow (automatic focus adjustment method) is stored in the memory 140 as a program for realizing the function in the computer.

  When the live view is started, the camera microcomputer 130 acquires information such as the ID, focus sensitivity, and aperture setting of the photographing optical system 152 from the lens microcomputer 160. Next, the camera microcomputer 130 sets the wobbling width from the acquired focus sensitivity and aperture setting, and determines the wobbling time from the lens ID and the wobbling width.

  Next, the camera microcomputer 130 determines the type of the AF area. In the case of one-point AF, since the frequency of changing the AF area is low, the camera microcomputer 130 sets the contrast evaluation cycle to 2 frames (or sets the lens driving stop period to be small). On the other hand, in the case of multipoint AF, face AF, and the like, since the frequency of changing the AF area is high, the camera microcomputer 130 sets the contrast evaluation cycle to 3 frames (or sets the lens drive stop period to be large).

  Note that “2 frames” and “3 frames” are merely examples, and it is sufficient that the contrast evaluation cycle when the AF region change frequency is low is smaller than the contrast evaluation cycle when the AF region change frequency is high. Further, it is sufficient that the lens drive stop period when the AF area change frequency is low is shorter than the lens drive stop period when the AF area change frequency is high.

  Subsequently, the camera microcomputer 130 calculates a delay time T1 from the vertical synchronization signal VD to the start of charge accumulation in the AF area based on the AF area. Further, the camera microcomputer 130 calculates the charge accumulation period (driving stop period T2) in the AF area from the charge reading speed (fixed value) and the shutter speed. Next, when there is a wobbling instruction, the camera microcomputer 130 notifies the lens microcomputer 160 of a vertical synchronization signal (for example, a second vertical synchronization signal described later), and T2, the period information of interest, and the wobbling information (driving) Center, drive width) is notified to the lens microcomputer 160.

  On the other hand, when the notification of the vertical synchronization signal is started, the lens microcomputer 160 detects a rising signal that matches the period information of interest, and sets the drive circuit 155 to drive the focus lens when the drive stop time has elapsed. Control.

  FIG. 1 is a timing chart of charge accumulation and wobbling. FIG. 1A shows a case where contrast detection is performed on the upper area of the screen, and FIG. 1B shows contrast detection performed on the lower area of the screen. Shows the case.

  Charge accumulation and readout of the image sensor 110 are performed in synchronization with the first vertical synchronization signal VD1. The delay time T1 is a time from the first vertical synchronization signal VD1 to the start of charge accumulation in the AF area that is a focus adjustment target area.

  The camera microcomputer 130 generates a second vertical synchronization signal VD2 delayed from the first vertical synchronization signal VD1 by a delay time T1, and transmits the second vertical synchronization signal VD2 to the lens microcomputer 160. According to the present embodiment, the camera microcomputer 130 transmits the second vertical synchronization signal VD2 to the lens microcomputer 160 instead of transmitting both the first vertical synchronization signal VD1 and the delay time T1, and information on the delay time T1. Is not transmitted, the amount of communication in wobbling is reduced. The camera microcomputer 130 transmits the second vertical synchronization signal VD2 at a constant cycle (or continuously). Accordingly, the camera microcomputer 130 controls the driving of the photographing optical system (photographing lens) 152 (the focus lens) by the drive circuit 155 of the lens unit 150 according to the second vertical synchronization signal VD2 (synchronously).

  In addition, the camera microcomputer 130 calculates a period during which the lens of the photographing optical system 152 is driven and a period when it should be stopped from the second vertical synchronization signal VD2. The drive stop period T2 is a period in which the lens drive is stopped at the closest position, and during this period, charge accumulation and readout in the AF area of the image sensor 110 and calculation of the contrast evaluation value are performed. The drive permission period T3 is a period during which the lens moves from the closest side to the infinite side for wobbling. During this period, the accumulation operation is performed while the lens is moving, so that the contrast evaluation value is not calculated. The drive stop period T4 is a period in which the lens drive is stopped at a position on the infinite side. During this period, charge accumulation and readout and calculation of a contrast evaluation value are performed. The drive permission period T5 is a period during which the lens moves from the invisible side to the close side for wobbling.

  Although T2 to T5 are transmitted as data from the camera microcomputer 130 to the lens microcomputer 160, they are not transmitted at a constant cycle like the second vertical synchronization signal VD2. That is, the camera microcomputer 130 transmits the data of T2 to T5 to the lens microcomputer 160 when the drive stop period (T2, T4) or the drive permission period (T3, T5) changes. The camera microcomputer 130 does not transmit the data of T2 to T5 to the lens microcomputer 160 while the drive stop period (T2, T4) and the drive permission period (T3, T5) are maintained.

  As described above, since the data of T2 to T5 is not output from the camera microcomputer 130 to the lens microcomputer 160 but is changed to data only when it is changed to data, the communication amount is larger than that of transmission at a constant period (or always). Can be suppressed.

  In FIG. 1A, one cycle of wobbling is performed in four cycles of the second vertical synchronization signal VD2. Based on the result of the contrast evaluation value, the lens microcomputer 160 issues a signal to the drive circuit 155 so as to drive the focus lens in the direction in which the contrast increases.

  As described above, the rolling reading of the image sensor 110 performed on the camera body side and the wobbling performed on the lens unit side are performed at the same timing, so that the contrast detection of the upper area of the screen can be performed. A signal for adjusting the timing is data of the second vertical synchronization signal VD2 and T2 to T5 sent from the camera microcomputer 130 to the lens microcomputer 160.

  FIG. 1B is different from FIG. 1A in that the delay time T1 is longer than the delay time T1 shown in FIG. This is because the delay time in the lower area of the screen is later than the delay time in the upper area of the screen. The lens microcomputer 160 receives the information of the second vertical synchronization signal VD2 and T2 to T5 from the camera microcomputer 130, and can detect the contrast in the lower area of the screen by changing the timing of the lens drive period and stop period. it can.

  FIG. 1C is different from FIG. 1A in the second vertical synchronization signal VD2. The second vertical synchronization signal VD2 shown in FIG. 1C is an unnecessary portion (the rising edge of the first vertical synchronization signal VD1 is delayed by a delay time T1 from the second vertical synchronization signal VD2 in FIG. 1A). Signal portion other than the signal portion). Since the amount of data of the second vertical synchronization signal VD2 is reduced, the amount of communication sent from the camera microcomputer 130 to the lens microcomputer 160 is also reduced. The same applies to the embodiments described later.

  FIG. 1D shows a case where the vertical synchronization signal VD is output from the camera microcomputer 130 to the lens microcomputer 160 at a rate of 4 periods in FIG. 1B. That is, the camera microcomputer 130 thins out the second vertical synchronization signal VD2 and transmits it to the lens microcomputer 160 so that the period of the second vertical synchronization signal VD2 becomes the period at which the contrast is evaluated. Is further reduced. The same applies to the embodiments described later.

  In this embodiment, instead of sending the first vertical synchronization signal VD1 and the delay time T1, the second vertical synchronization signal VD2 is transmitted, and the data of T2 to T5 is only when one of them is changed. Although it is transmitting, the two do not necessarily have to be combined. For example, the camera microcomputer 130 may transmit the first vertical synchronization signal VD1 to the lens microcomputer 160 and transmit the data of T1 to T5 only when any of these is changed. Alternatively, the camera microcomputer 130 may transmit the second vertical synchronization signal VD2 to the lens microcomputer 160 and transmit the data of T2 to T5 without being changed. The same applies to the following embodiments.

  The second vertical synchronization signal VD2 is generated with reference to the rising edge of the first vertical synchronization signal VD, but may be generated with reference to the falling edge of the first vertical synchronization signal VD.

  FIG. 2 is a timing chart of charge accumulation and wobbling. FIG. 2A shows a case where contrast detection (or one point AF) is performed on a narrow area of the screen, that is, a case where the frequency of changing the AF area is low. FIG. 2B shows a case where contrast detection (or multipoint AF) is performed on the entire area of the screen, that is, a case where the frequency of changing the AF area is high.

  As in the first embodiment, charge accumulation and readout of the image sensor 110 are performed in synchronization with the first vertical synchronization signal VD1. The delay time T1 is a time from the first vertical synchronization signal VD1 to the start of charge accumulation in the AF region.

  Similarly to the first embodiment, the camera microcomputer 130 generates a second vertical synchronization signal VD2 delayed from the first vertical synchronization signal VD1 by a delay time T1 and transmits the second vertical synchronization signal VD2 to the lens microcomputer 160. According to the present embodiment, the camera microcomputer 130 transmits the second vertical synchronization signal VD2 to the lens microcomputer 160 instead of transmitting both the first vertical synchronization signal VD1 and the delay time T1, and information on the delay time T1. Does not transmit, so the amount of communication is reduced. The camera microcomputer 130 transmits the second vertical synchronization signal VD2 at a constant cycle (or continuously).

  Similarly to the first embodiment, the camera microcomputer 130 transmits T2 to T5 to the lens microcomputer 160 only when any one of them is changed, and suppresses the communication amount as compared with the constant transmission.

  In FIG. 2A, one cycle of wobbling is performed in four cycles of the second vertical synchronization signal VD2. That is, the contrast evaluation is performed once every two frames. Thereafter, the lens microcomputer 160 instructs the drive circuit 155 to drive the focus lens in the in-focus direction based on the result of the contrast evaluation value.

  FIG. 2B is different from FIG. 2A in that the drive stop periods T2 and T4 are longer than those in FIG. This is because in the rolling readout method, the accumulation time of the portion close to the entire area is shifted little by little while the upper and lower portions of the screen overlap. In FIG. 2B, one cycle of wobbling is performed in six cycles of the second vertical synchronization signal VD2. That is, the contrast evaluation is performed once every three frames.

  The lens microcomputer 160 receives the information of T2 to T5 from the camera microcomputer 130, and can detect the contrast of the entire region by changing the timing of the lens driving period and the stop period. As described above, even when the AF area changes frequently as shown in FIG. 2B, if the driving method shown in FIG. 2B is selected in advance, the timing for starting and ending the lens driving period is driven. It is not necessary to transmit to the circuit 155, and the amount of communication can be reduced.

  2 (c) and 2 (d) change the signal transmitted from the camera microcomputer 130 to the lens microcomputer 160 in FIGS. 2 (a) and 2 (b), respectively. The second vertical synchronizing signal VD2 informs the lens microcomputer 160 of the drive stop periods T2 and T4 in the low level period, and informs the lens microcomputer 160 of the drive permission periods T3 and T5 in the high level period. For this reason, in FIG. 2C and FIG. 2D, since it is not necessary to transmit the data of T2 to T5 from the camera microcomputer 130 to the lens microcomputer 160, the data transfer amount is smaller.

  However, in FIG. 2C and FIG. 2D, since the signal is the same as the position on the near side and the position on the infinite side, phase inversion may cause a problem. With regard to this, if it is determined in advance whether wobbling starts from the near side or the infinite side, there is no mistake in whether the contrast is higher on the near side or on the infinite side.

  In FIG. 2C and FIG. 2D, the low level and the high level may be reversed. Therefore, one of the low level and high level periods of the vertical synchronization signal VD is the drive stop period T2 or It is only necessary to coincide with T4 and the other period coincides with the drive permission period T3 or T5.

  FIG. 3 is a timing chart of charge accumulation and wobbling when the shutter speed is fast in FIG. That is, FIG. 3A shows a case where contrast detection is performed on a narrow area of the screen (that is, when the AF area is changed less frequently) and the accumulation time of the image sensor 110 is short. FIG. 3B illustrates a case where contrast detection is performed on the entire area of the screen (that is, when the AF area is frequently changed) and the accumulation time of the image sensor 110 is short.

  In FIG. 3A, one cycle of the wobbling operation is performed in two cycles of the second vertical synchronizing signal VD2, and in FIG. 3B, one cycle of four cycles of the second vertical synchronizing signal VD2. A cycle wobbling operation is being performed.

  Similar to FIG. 1C, the rate of the second vertical synchronization signal VD2 is reduced to 2 periods in FIG. 3A, and the rate of the second vertical synchronization signal VD2 is reduced to 4 periods in FIG. 3B. May be. Similarly to FIGS. 2C and 2D, T2 and T4 are notified to the lens microcomputer 160 during the low level period of the vertical synchronization signal, and T3 and T5 are notified to the lens microcomputer 160 during the high level period. May be.

  Even in this embodiment, even when the AF area changes frequently, it is not necessary to transmit the start and end timings of the lens drive period to the drive circuit 155, and the amount of communication can be reduced.

  As mentioned above, although the preferable Example of this invention was described, this invention is not limited to these Examples, A various deformation | transformation and change are possible within the range of the summary.

  The imaging device can be applied to use for imaging a subject.

110 Image sensor 120 Signal processing circuit 128 Setting means 130 Camera microcomputer (control means)
150 Lens unit 152 Imaging optical system 155 Drive circuit (drive means)

Claims (6)

A lens unit having a photographing optical system and a driving unit that drives the photographing optical system is configured to be interchangeable, and a wobbling direction of the photographing optical system in the optical axis direction by the driving unit is used to determine a direction in which the in-focus position is present. An imaging apparatus for moving the imaging optical system in the direction via the driving means,
An image sensor that performs charge accumulation and readout in units of pixel rows in synchronization with a first vertical synchronization signal;
In the wobbling, a second vertical synchronization signal delayed from the first vertical synchronization signal is generated, and the second vertical synchronization signal is transmitted to the lens unit according to the second vertical synchronization signal. Control means for controlling driving of the photographing optical system by the driving means;
An imaging device comprising:   The second vertical synchronization signal is a signal delayed by a delay time from the first vertical synchronization signal until the start of charge accumulation in the focus adjustment target region of the image sensor. The imaging device according to claim 1.   The control means includes a drive stop period in which the driving of the photographing optical system is set in a period of charge accumulation in the focus adjustment target area of the image sensor in the lens unit, and after the drive stop period. Controlling the driving of the imaging optical system by the driving means according to the second vertical synchronization signal and the data by transmitting data including a drive permission period during which the imaging optical system is started to be driven The imaging apparatus according to claim 1, wherein the imaging apparatus is characterized. The second vertical synchronization signal has a low level and a high level,
One period of the low level and the high level of the second vertical synchronization signal is set as a charge accumulation period in the focus adjustment target area of the image sensor. And the other period of the low level and the high level of the second vertical synchronization signal coincides with a drive permission period during which the photographing optical system is started after the drive stop period. The imaging device according to claim 1.   The control means thins out the second vertical synchronization signal and transmits it to the lens unit so that the period of the second vertical synchronization signal becomes a period at which contrast is evaluated in the wobbling. The imaging device according to any one of claims 1 to 3. A lens unit having a photographing optical system and a driving unit that drives the photographing optical system is configured to be interchangeable, and a wobbling direction of the photographing optical system in the optical axis direction by the driving unit is used to determine a direction in which the in-focus position is present. An imaging apparatus for moving the imaging optical system in the direction via the driving means,
An image sensor that performs charge accumulation and readout in units of pixel rows;
In the wobbling, a driving stop period in which the driving of the imaging optical system is stopped that is set during a charge accumulation period of a focus adjustment target region of the imaging device, and the imaging optical that starts after the driving stop period Data including a drive permission period during which the system is driven is transmitted to the lens unit when the drive stop period or the drive permission period changes, and the drive stop period and the drive permission period are maintained. Control means for controlling the driving of the photographing optical system by the driving means according to the data by not transmitting while
An imaging device comprising: