JP2004280048A - Lens control system and camera device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens control system and a camera device capable of realizing the improvement of accuracy in autofocus by performing focusing in a state where the depth of focus is made small by setting a diaphragm to be open at the time of focusing by contrast system autofocus, and realizing the improvement of accuracy in tracking adjustment by automatically performing the tracking adjustment so as to facilitate the tracking adjustment and also performing the contrast system autofocus in a state where the diaphragm is set to be open even at the time of focusing in the case of performing the tracking adjustment. <P>SOLUTION: When a control unit 16 is designated to perform the autofocus or the tracking adjustment, it sets the diaphragm of a photographic lens 10 to be open and also controls a camera main body 12 to perform exposing adjustment which becomes appropriate in a state where the diaphragm is open. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lens control system and a camera device, and more particularly to a lens control system and a camera device that perform focusing by contrast type autofocus.

  Generally, an autofocus (AF) method adopted in a television camera or a video camera is a contrast method. In the contrast method, for example, a high-frequency component is extracted from a video signal obtained by photographing a subject by using a filter, and the level of the contrast (sharpness) of the subject image is evaluated based on the high-frequency component. Then, the focus (focus lens) of the photographing lens is controlled so that the evaluated value (referred to as a focus evaluation value in the present specification) becomes maximum (maximum).

  In general, a movable lens group (hereinafter, referred to as a tracking lens) is disposed in a part of a relay system in a photographing lens used for a television camera, and the position of the tracking lens is adjusted at the time of factory shipment or the like. Tracking adjustment (flange back adjustment) is performed.

The tracking adjustment mainly adjusts the position (focal position) of the image forming surface of the photographing lens by the tracking lens so that the defocus (zoom focus movement) due to zooming does not occur. Done. First, with the tracking lens fixed, the focus of the photographing lens is set with the stationary object as the subject, and the zoom is set to the wide end. Then, the position of the tracking lens is adjusted to focus. Then, set the zoom to the telephoto end and move the focus to focus. These operations are repeated, and if the focus is not blurred even when the zoom is moved, the tracking adjustment is completed.
JP-A-61-133912

  By the way, conventionally, the operation of the tracking adjustment as described above is generally performed manually. However, it is troublesome to perform manually, and focusing performed by driving a focus lens or a tracking lens can be performed by auto-focusing. Therefore, it is desirable that the tracking adjustment can be automatically performed.

  When focusing is performed by driving a focus lens or a tracking lens, it is effective to open the aperture and reduce the depth of focus in order to perform focusing with high accuracy. In this case, when the aperture is stopped down according to the brightness of the subject, the depth of focus becomes deep, and an image without blur is obtained. However, conventionally, there is no proposal for controlling the aperture at the time of autofocus.

  The present invention has been made in view of such circumstances, and provides a lens control system and a camera device capable of improving the accuracy of autofocus by a contrast method and performing tracking adjustment easily and with high accuracy. With the goal.

  In order to achieve the object, a lens control system according to claim 1 drives an optical system including a focus adjustment lens for focus adjustment and an aperture, and electrically drives the focus adjustment lens and the aperture. A lens control system comprising: a driving unit; and an auto-focusing unit that automatically focuses by driving the focus adjustment lens by the driving unit based on a high-frequency component of an image formed by the optical system. And a diaphragm control unit for setting the diaphragm to an open state by the driving unit when focusing by the autofocus unit.

  Further, in the lens control system according to the second aspect, in the invention according to the first aspect, the focus adjustment lens is a focus lens that is driven to focus on a desired subject, or a focus lens that is driven. It is a tracking lens driven to change the position.

  Further, the lens control system according to claim 3 changes a focus lens driven to focus on a desired subject, a zoom lens driven to change a focal length, and a position of an image plane. An optical system including a tracking lens and a diaphragm driven to perform focusing, a driving unit for electrically driving the focus lens, the zoom lens, the tracking lens, and the diaphragm, and a height of an image formed by the optical system. A tracking control for setting the tracking lens to an optimal position in a lens control system including: an auto-focus unit that drives the focus lens or the tracking lens by the driving unit based on a band frequency component to automatically perform focusing. Tracking adjustment start instructing means for instructing the start of When the start of tracking adjustment is instructed by the adjustment start instructing means, the driving means drives the zoom lens; the driving means drives the focus lens; A tracking adjustment executing means for executing the focusing by the auto focus means by driving the tracking lens according to a predetermined procedure for tracking adjustment; and Aperture control means for setting to an open state.

  According to a fourth aspect of the present invention, in the lens control system according to any one of the first to third aspects, at the time of focusing by the auto-focusing means, an execution state of the auto-focus is displayed on the display means. It is characterized by:

  Further, in the lens control system according to the fifth aspect, in the invention according to any one of the first to fourth aspects, when the auto-focusing unit starts focusing, or when the tracking adjustment starts to be executed, A predetermined exposure adjustment is performed on a camera device that generates an image signal by photoelectrically converting an image formed by an optical system by an imaging unit so that the level of the image signal when the aperture is opened is proper. It is characterized by having

  In the camera device according to the sixth aspect, a signal indicating the start is given by the lens control system according to the fifth aspect at the time of starting focusing by the autofocus means or at the time of starting execution of the tracking adjustment. Then, the aperture is set to an open state by the aperture control means, and exposure adjustment is performed by a predetermined exposure adjusting means for adjusting the level of an image signal so that an appropriate exposure is obtained when the aperture is opened. .

  According to the present invention, since the aperture is set to be open at the time of focusing by autofocus, focusing is performed with the depth of focus reduced, and the accuracy of autofocus is improved. Further, by automatically performing the tracking adjustment, the tracking adjustment is facilitated, and the accuracy of the tracking adjustment is improved because the autofocus is performed with the aperture opened at the time of focusing during the tracking adjustment. Further, exposure adjustment when the aperture is set to open is performed by exposure adjustment means such as a CCD reading frame rate, an electronic shutter, a gain, and an ND filter in the camera device. Failure to operate properly can be prevented.

  Hereinafter, preferred embodiments of a lens control system and a camera device according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing the configuration of a moving image shooting system to which the present invention is applied. Note that the shooting system according to the present embodiment is a system suitable for movie shooting.

  In FIG. 1, a photographing lens (optical system) 10 is mounted on a camera body (camera device) 12 having an image sensor, a video signal processing circuit, and the like mounted thereon. The photographing lens 10 is divided into a focus unit 10A, a zoom unit 10B, an iris unit 10C, and a tracking unit 10D according to the type of movable optical components arranged in the lens barrel. A focus lens (group) driven in the optical axis direction to focus on the subject is disposed in the zoom unit 10B, and a zoom lens (driven in the optical axis direction to change the focal length of the photographing lens 10 is provided in the zoom unit 10B). Group) is arranged. The iris unit 10C is provided with an aperture, and the tracking unit 10D is provided with a tracking lens that is driven to adjust the position of the imaging surface of the photographing lens 10.

  The focus lens, zoom lens, aperture, and tracking lens arranged in each of the units 10A to 10D are respectively connected to, for example, drive motors of the drive units 14A to 14D mounted on the lens barrel of the photographing lens 10, and are driven by the respective motors. It has become. Each of the drive units 14A to 14D is connected to a predetermined terminal of the control unit 16 by a cable or the like, and the motor of each of the drive units 14A to 14D is driven by a drive signal given from the control unit 16. Therefore, the focus lens, the zoom lens, the aperture, and the tracking lens are driven according to the drive signal from the control unit 16.

  The control unit 16 is a device having a built-in circuit for executing processing such as autofocus and tracking adjustment, as will be described in detail later. The drive units 14A to 14D and the control unit 16 may be built in a device integrated with the photographing lens 10 as a lens device.

  A video signal output terminal 12A of the camera body 12 is connected to a predetermined terminal of the control unit 16 by a cable or the like, and an image formed by the photographing lens is photoelectrically converted by an image sensor of the camera body 12 and obtained. A video signal is provided to the control unit 16. When performing focusing by auto-focusing, the control unit 16 performs focusing by driving a focus lens or a tracking lens based on the video signal by a contrast-type auto-focusing process as described later in detail.

  A control terminal 12B of the camera body 12 is connected to other terminals of the control unit 16 by a cable or the like, so that power of the control unit 16 is supplied from the camera body 12 and exchange of various signals with the camera body 12 is performed. Is being done.

  The focus and zoom of the photographing lens 10 can be manually operated using a focus controller 18 and a zoom controller 20 connected to a predetermined terminal of the control unit 16. A command signal based on operation of a manual operation member provided in the focus controller 18 or the zoom controller 20 is provided. The control unit 16 enables manual focus and zoom operations by driving a focus lens and a zoom lens based on command signals given from the controllers 18 and 20. The aperture and the tracking lens can also be manually operated by the controller.

  A display 22 is connected to a predetermined terminal of the control unit 16, and the display 22 displays information of a currently set focus position and information of a desired focus position stored in advance. It has become. The display 22 is not dedicated to the present system, and may be, for example, a commercially available portable computer. The display 22 may be built in the control unit 16.

  FIG. 2 is a block diagram showing a configuration related to the autofocus processing and the tracking adjustment processing in the above system. The CPU 30 shown in the figure is built in the control unit 16, and the CPU 30 controls the focus driver circuit 32A, the zoom driver circuit 32B, the iris driver circuit 32C, and the tracking driver circuit 32D mounted on each of the drive units 14A to 14D. A drive signal is provided, and each motor of the drive units 14A to 14D is driven by each of the driver circuits 32A to 32D based on a drive signal from the CPU 30.

  Various signals are transmitted and received between the CPU 30 and the control terminal 12B of the camera body 12 and between the CPU 30 and the display 22.

  On the other hand, the video signal supplied from the video signal output terminal 12A of the camera body 12 to the control unit 16 is input to the focus evaluation value generation unit 34, where a focus evaluation value for evaluating the level of the contrast of the image is generated. The evaluation value is provided to the CPU 30.

  The focus evaluation value generator 34 mainly includes an A / D converter 36, a high-pass filter (HPF) 38, a gate circuit 40, and an adder 42. The video signal input to the control unit 16 is first converted into a digital signal by the A / D converter 36. Here, the video signal is a luminance signal indicating the luminance value of each pixel constituting the screen. The video signal converted into a digital signal by the A / D converter 36 is subsequently input to a high-pass filter (HPF) 38 to extract a signal of a high frequency component. The signal extracted by the HPF 38 is input to the gate circuit 40. As for the signal input to the gate circuit 40, only a signal in a range corresponding to a pixel in a focus area (for example, the center of the screen) set by a signal from the CPU 30 is extracted and input to the adder 42. Then, they are added by the adder 42. As a result, the sum of the signal values in the focus area among the high frequency component signals extracted from the video signal by the HPF 38 is obtained. The value obtained in this way is a focus evaluation value indicating the level of the contrast (sharpness) of the image in the focus area, and the score evaluation value is given to the CPU 30.

  The CPU 30 moves the focus lens (or the tracking lens) to the maximum point of the focus evaluation value by a so-called hill-climbing method while referring to the focus evaluation value provided from the focus evaluation value generation unit 34. That is, the focus lens is moved in a direction in which the focus evaluation value increases, and when the focus evaluation value indicates a decrease, the position at which the focus evaluation value switches from increase to decrease is determined as a local maximum point (in-focus), and the position is determined. Stop the focus lens at the position. Thereby, the subject in the focus area is focused.

  By the way, the control unit 16 is provided with a control switch 44 composed of a plurality of switches, and a switch signal indicating the switch state is given to the CPU 30. The CPU 30 executes the following processing based on the switch state of the control switch 44.

  First, an outline of the processing of the CPU 30 will be described with reference to FIG. 3 showing the configuration of the control switch 44. In the figure, the AF switch 50 can be switched between an on state and an off state. When it is on, the auto focus is valid, and when it is off, the auto focus is invalid. When the AF switch 50 is turned off, the CPU 30 drives a focus lens or the like according to a manual operation of the focus controller 18 or the like shown in FIG. 1, for example.

  On the other hand, when the AF switch 50 is set to ON, the processing is switched to the processing according to the setting states of the focusing switch 52 and the full open switch 54, and when the start switch 56 is turned ON, the processing is performed. Start.

  It is assumed that the AF switch 50 is on and the focusing switch 52 is set to the “FOCUSING” side (on). At this time, when the start switch 56 is turned on, the CPU 30 executes a focusing process. In the focusing process, one-shot auto focus (one-shot AF) is executed. The one-shot AF is an auto focus that performs focus only once. When the start switch 56 is turned on, the CPU 30 sets the focus lens based on the focus evaluation value acquired from the focus evaluation value generation unit 34 as described above. It drives and sets the focus lens to the in-focus position (the maximum point of the focus evaluation value). Then, once the focus lens is set at the in-focus position, even when the focus evaluation value changes, the focus lens is kept stopped at that position.

  Although a specific processing procedure will be described later, when executing the one-shot AF, if the full open switch 54 is set to ON, the aperture is driven to open the aperture (full open). After setting, the one-shot AF is executed in this state. As a result, autofocus is performed in a state where the depth of focus is shallow, and focusing is performed with high accuracy. On the other hand, when the full open switch 54 is set to off, the process of opening the aperture is not performed. Note that the AF in the present embodiment is one-shot AF in any case, but may be continuous AF in which AF is continuously performed.

  On the other hand, if the start switch is turned on when the focusing switch 52 is set to the “TRACKING” side (off), the CPU 30 executes a tracking adjustment process. Although details of the tracking adjustment processing procedure will be described later, at the time of tracking adjustment, a process similar to that of the one-shot AF is executed by driving the focus lens or the tracking lens. At this time, the aperture is set to the open state unconditionally, and the focusing is performed with high accuracy.

  When the aperture is set to be open when executing the focusing or tracking adjustment processing, the CPU 30 transmits to the camera body 12 that the camera is in the full open mode through the control terminal 12B (see FIG. 1). In response, the camera body 12 sends a full open command to the CPU 30 through the control terminal 12B to set the aperture to open. Normally, control of the aperture is performed according to a control signal provided from the camera body 12. Therefore, in this case, when the CPU 30 receives the full open command given from the camera body 12, the CPU 30 sets the aperture to open accordingly. However, in the case of the full open mode, the CPU 30 may set the aperture to open without receiving the full open command from the camera body 12.

  When the aperture is opened, the camera body 12 subsequently reads the image sensor (for example, a CCD) of the camera body 12 so that the video signal obtained when the aperture is opened is at an appropriate level. The exposure is adjusted by adjusting the gain, ND filter, electronic shutter, and the like. Then, when the exposure adjustment (or preparation thereof) is properly performed, a command (hereinafter, referred to as an AF start command) for executing the focusing and tracking adjustment processing is transmitted to the CPU 30 through the control terminal 12B.

  The marking switch 58 in FIG. 3 is a switch for instructing recording of a focus lens position (focus position). When the marking switch 58 is turned on, the CPU 30 acquires a current focus position and plots the focus position. 1 is displayed on the display 22 shown in FIG. More specifically, as the value indicating the current focus position (the focus position when the marking switch 58 is turned on), for example, a value obtained by detecting the position of the focus lens with a potentiometer is acquired from the drive unit 14A shown in FIG. However, in the present embodiment, when the CPU 30 outputs a drive signal to the drive unit 14A to move the focus lens to a desired position, the CPU 30 sets a focus control value set as a value indicating the movement target position. The current value is used as a value indicating the current focus position. Then, the CPU 30 transmits the current focus control value and a marking signal for marking to the display 22.

  Here, an example of display on the screen of the display 22 is shown in FIG. On the screen 70 of the display unit 22, a memory 72 of the shooting distance corresponding to the position of the focus lens (a memory of about 3 m to で は in the figure) is displayed, and a bar-shaped index 74 indicating the current focus position is displayed. Is displayed. The current focus position is changed by the focus control value sequentially given from the CPU 30 as described above, so that the index 74 moves on the screen and the index 74 is adjusted to the memory value corresponding to the current focus position. Has become.

  On the left side of the memory 72, the focus position (marking position) when the marking is instructed by the marking switch 58 is displayed by marks 76, 76, 76. That is, the display unit 22 stores the focus control value given together with the marking signal from the CPU 30, and displays a mark at a position on the screen corresponding to the focus control value. A plurality of marking positions can be set, and each mark 76 is displayed in a different color. Note that, instead of changing the color of each mark 76, the shape and the like may be changed. The mark at the marking position is displayed unless intentionally erased, and is also displayed during manual focusing when the AF switch 50 is off.

  By the way, this system is a system specialized for use in movie shooting. In movie shooting, test shooting for setting shooting conditions of the shooting lens (optical system) 10 and the camera body 12 is usually performed before actual shooting. At that time, focus on the subject at the same distance as in the actual production by autofocus with the aperture open as described above, mark the focus position at that time, and focus during the actual shooting By setting to, it is possible to shoot a video without blur. In other words, during test shooting, focusing is performed in a state where the depth of focus is shallower than the aperture setting state during actual shooting, so even if the subject distance does not completely match between test shooting and actual shooting. An image without blur can be obtained.

  In addition, since the focus operation at the time of the actual shooting is usually performed manually, the focus position set by the auto focus during the test shooting is recorded (marked) by turning on the marking switch 58 as described above, and the focus position is set. It is effective to display the information on the display 22. At the time of actual shooting, if the focus is manually operated while looking at the display 22 and the index 74 is set to the desired mark 76 displayed on the display 22, the focus can be easily and reliably set by the autofocus at the time of the test shooting. The reproduced focus position can be reproduced.

  Note that the focus may be controlled by the display 22. When the user designates to set the focus at the focus position (marking position) of a desired mark 76 by a predetermined operation, an instruction to that effect is sent to the CPU 30. The transmitted focus lens may be set at the designated marking position.

  Next, the processing procedure of the CPU 30 will be described with reference to the flowchart of FIG. First, the CPU 30 performs necessary initial settings (step S10), and then executes a process other than auto focus (including tracking adjustment) (step S12). Subsequently, it is determined whether the AF switch 50 is on (step S14). If the determination is NO, the process returns to step S12. On the other hand, if determined to be YES, it is determined whether or not the marking switch 58 has been turned on (step S16). In general, the marking switch 58 is turned on after the focusing process is performed once. When the marking switch 58 is turned on, a marking signal and the current focus control value are transmitted to the display 22 (step S18). If the marking switch 58 has not been turned on, the processing in step S18 is not performed.

  Next, the CPU 30 determines whether or not the start switch 56 has been turned on (step S20). If the determination is NO, the process returns to step S16. On the other hand, if it is determined as YES, it is determined whether or not the focusing switch 52 is set to ON (step S22). Here, when the determination is YES, the focusing process is started, and when the determination is NO, the tracking adjustment process is started.

  When determining YES in step S22 and starting the focusing process, the CPU 30 subsequently determines whether or not the full open switch 54 is set to ON (step S24). If the determination is YES, the fact that the camera is in the full open mode is transmitted to the camera body 12 (step S26). This causes the camera body 12 to start processing for exposure adjustment with the aperture open. The exposure adjustment process in the camera body 12 will be described later.

  Next, the CPU 30 determines whether or not there is a full open command from the camera body 12 (step S28). Here, this determination is repeated while the determination is NO, and if the determination is YES, the aperture is set to open (step S30). Subsequently, it is determined whether an AF start command transmitted from the camera body 12 when the exposure adjustment in the camera body 12 is completed is received (step S31). Here, this determination is repeated while the determination is NO, and if the determination is YES, the focus lens is driven to execute the one-shot AF process (step S32). When the focusing by the one-shot AF is completed, the completion of the AF is notified to the camera main body 12, and the exposure adjustment, the aperture and the like in the camera main body 12 are returned to the normal state (step S34).

  If NO is determined in step S24, the process from step S32 is executed without performing the aperture opening process from step S26 to step S31. Upon completion of the process in the step S34, the process returns to the step S14.

  If the determination in step S22 is NO, that is, if the tracking adjustment process is to be performed, the CPU 30 first transmits to the camera body 12 that the camera is in the full open mode (step S36). This causes the camera body 12 to start a later-described exposure adjustment process with the aperture open.

  Next, the CPU 30 determines whether or not there is a full open command from the camera body 12 (step S38). Here, this determination is repeated while the determination is NO, and if the determination is YES, the aperture is set to open (step S40). Subsequently, it is determined whether an AF start command transmitted from the camera body 12 when the exposure adjustment in the camera body 12 is completed is received (step S41). Here, this determination is repeated while the determination is NO, and if the determination is YES, the processing from the next step S42 is started.

  If YES is determined in the step S41, the CPU 30 then drives the zoom lens to move the zoom to the wide end (step S42). Then, the tracking lens is driven to execute the one-shot AF process (step S44). That is, the tracking lens is set at a position where the focus evaluation value obtained from the focus evaluation value generation unit 34 is maximum. Next, the zoom is moved to the telephoto end (step S46). Then, the focus lens is driven to execute the one-shot AF process (step S48). When the processing in steps S42 to S48 is completed, it is determined whether or not the current processing in steps S42 to S48 is the third time (step S50). If the determination is NO, the processing from step S42 is repeated. On the other hand, if the determination is YES, the completion of AF is notified to the camera body 12, and the exposure adjustment, aperture, and the like in the camera body 12 are returned to the normal state (step S52). Upon completion of the process in the step S52, the process returns to the step S14.

  Next, the processing procedure of the exposure adjustment in the camera body 12 which has received the information of the full open mode from the CPU 30 in the step S24 or S36 will be described with reference to the flowchart of FIG. When receiving the full open mode from the CPU 30 (step S100), the processing unit of the camera body 12 first saves the current setting value (camera setting value) related to the exposure adjustment (step S102). Subsequently, a full open command for instructing to open the aperture is transmitted to the CPU 30 (step S104). Thus, the aperture of the taking lens 10 is set to be open.

  Next, the processing unit of the camera body 12 determines whether or not the level of the video signal obtained by imaging with the imaging device (CCD) is within a range of a predetermined specified level that is determined to be appropriate exposure (step S106). . If the determination is NO, then it is determined whether the specified time has elapsed (step S108). If the determination in step S108 is NO, the video signal level is controlled (step S110), and the process returns to step S106. The control of the video signal level in step S110 is control to keep the level of the video signal within a specified level range by a method other than adjusting the aperture of the photographing lens 10. The method of adjusting the level can be, for example, a method of adjusting a CCD reading frame rate, a gain of a video signal level, an ND filter, an electronic shutter, or the like, and is not limited to a specific method.

  On the other hand, if YES in step S106, that is, if it is determined that the video signal level is within the range of the specified level by the processing in step S110 or the like, or if it is determined YES in step S108, the steps in the flowchart of FIG. An AF start command corresponding to S31 or S41 is transmitted to the CPU 30 (Step S112). Thus, the CPU 30 starts the focusing or tracking adjustment process.

  Next, the processing unit of the camera body 12 determines whether or not a signal indicating completion of AF corresponding to step S34 or step S52 in the flowchart of FIG. 5 has been received from the CPU 30 (step S114). If the determination is NO, it is determined whether the specified time has elapsed (step S116). If the determination is NO, the process returns to step S114.

  On the other hand, if YES in step S114, that is, if it is determined that the signal of AF completion has been received, or if YES in step S116, the setting value related to the exposure adjustment is returned to the original setting value stored in step S102. (Step S118). This completes the exposure adjustment with the aperture open.

  As described above, in the above-described embodiment, the present invention has been described as a shooting system suitable for movie shooting, but the present invention can also be applied to a shooting system (camera control system) for other uses such as television broadcasting.

  In the above embodiment, the execution state of the autofocus is transmitted to the camera body 12 by serial communication or the like, and the execution state of the autofocus, for example, the autofocus state is displayed on the screen of the viewfinder installed in the camera body 12 or the like. May be displayed to indicate that it is being executed, that it has ended normally, that it has ended abnormally, or the like. Further, the execution state of the autofocus may be displayed on the display 22 instead of the viewfinder.

  Further, in the above embodiment, when the camera body 12 receives the full open command from the CPU 30 of the control unit 16 to command the aperture opening, and executes the exposure adjustment, the aperture is actually set to open and then the video signal Although the level is adjusted by a predetermined exposure adjusting means so as to obtain an appropriate exposure when the aperture is opened, a method of adjusting the exposure so as to obtain an appropriate exposure is not limited to this. For example, when a full-open command is received, the exposure adjustment unit is set so that an appropriate exposure is obtained when the aperture is opened, without actually opening the aperture (or the set value is determined). After that, the aperture may be actually set to the open state so that an appropriate exposure is obtained at that time.

FIG. 1 is a block diagram showing a configuration of a photographing system to which the present invention is applied. FIG. 2 is a block diagram showing a configuration of the control unit. FIG. 3 is a diagram illustrating a configuration of the control switch. FIG. 4 is a diagram illustrating a display mode on a display device. FIG. 5 is a flowchart showing a processing procedure of the CPU. FIG. 6 is a flowchart showing a processing procedure of exposure adjustment in the camera body in the full open mode.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 10 ... Photographing lens, 10A ... Focus part, 10B ... Zoom part, 10C ... Iris part, 10D ... Tracking part, 12 ... Camera body, 14A-14D ... Drive unit, 16 ... Control unit, 18 ... Focus controller, 22 ... Display , 30 CPU, 32A focus driver circuit, 32B zoom driver circuit, 32C iris driver circuit, 32D tracking driver circuit, 34 focus evaluation value generator, 36 A / D converter, 38 high-pass filter 40 gate circuit, 42 adder, 44 control switch, 50 AF switch, 52 focusing switch, 54 full open switch, 56 start switch, 58 marking switch

Claims (6)

An optical system including a focus adjustment lens and an aperture for focus adjustment; a driving unit that electrically drives the focus adjustment lens and the aperture; and a high frequency component of an image formed by the optical system. A lens control system comprising: an auto-focus unit configured to automatically perform focusing by driving the focus adjustment lens by the driving unit based on the
A lens control system, comprising: aperture control means for setting the aperture to an open state by the driving means at the time of focusing by the autofocus means. 2. The focus adjustment lens according to claim 1, wherein the focus adjustment lens is a focus lens driven to focus on a desired subject, or a tracking lens driven to change a position of an image plane. Lens control system. A focus lens driven to focus on a desired subject, a zoom lens driven to change the focal length, a tracking lens driven to change the position of the image plane, and an aperture An optical system, a drive unit for electrically driving the focus lens, zoom lens, tracking lens, and diaphragm, and the focus lens or the tracking lens based on a high-frequency component of an image formed by the optical system. A lens control system comprising: an auto-focus unit that automatically performs focusing by driving the driving unit.
Tracking adjustment start instructing means for instructing the start of tracking adjustment for setting the tracking lens to an optimal position,
When the start of the tracking adjustment is instructed by the tracking adjustment start instructing means, the driving of the zoom lens by the driving means, the focusing by the auto focus means by driving the focus lens by the driving means, Tracking adjustment execution means for executing the focusing by the autofocus means by driving the tracking lens by driving means in a predetermined procedure for tracking adjustment;
At the time of executing the tracking adjustment, aperture control means for setting the aperture to an open state by the driving means,
A lens control system comprising: 4. The lens control system according to claim 1, wherein, at the time of focusing by the autofocus unit, an execution state of the autofocus is displayed on a display unit. 5. At the start of focusing by the auto-focusing means, or at the start of execution of the tracking adjustment, the camera device that photoelectrically converts an image formed by the optical system by an imaging unit to generate an image signal, The lens control system according to any one of claims 1 to 4, wherein predetermined exposure adjustment is performed so that the level of the image signal when the lens is opened is proper. 6. The lens control system according to claim 5, wherein when a signal indicating the start is given at the time of starting focusing by the auto focus means or at the time of starting execution of the tracking adjustment, the aperture control means opens the aperture. A camera device, wherein the camera is set to a state and performs exposure adjustment by a predetermined exposure adjusting means for adjusting the level of an image signal so as to obtain an appropriate exposure when the aperture is opened.

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