Abstract:
Disclosed is an image taking apparatus which includes an optical apparatus provided with a focus detection and focusing control unit for controlling a focus lens by an automatic focus detection and focusing control; a remote operation apparatus provided with a first switchover signal inputting unit for performing a switchover between a control of the focus lens by the automatic focus detection and focusing control and a control of the focus lens by a remote instruction control, and a second switchover signal inputting unit for performing a switchover between manual operations of the focus lens by a speed control and a position control; and a switchover signal superposing unit for superposing an output from the first switchover signal inputting unit and an output from the second switchover signal inputting unit. It is thereby possible to solve the problem occurring when a switchover signal inputting unit capable of performing a switchover between an AF control and an MF control is provided in the remote operating apparatus.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to an image taking apparatus usable in a television camera, a video camera, a television lens, a video lens, and the like which perform an automatic focus detection and focusing control (hereinafter referred to as an AF control).  
           [0003]    2. Related Background Art  
           [0004]    In recent years, the AF control is indispensable in image taking apparatuses such as video cameras for consumers. In such a kind of AF control, a prevailing method is an automatic focus detecting method in which a signal in conformity with a sharpness of an object is extracted from a pickup signal, and evaluated to execute a focus detecting operation of an optical system.  
           [0005]    An operation example of that AF control method will be described with reference to FIG. 3.  
           [0006]    In FIG. 3, reference numeral  600  designates a camera having a lens unit which is incapable of detachable attachment to a camera unit. Reference numeral  102  designates an evaluation value generating unit for extracting a sharpness evaluation value from a video signal output from a processing unit  202  (described later). Reference numeral  103  designates an AF drive controlling unit for generating a motor control signal such that the sharpness evaluation value generated by the evaluation value generating unit  102  can be maximized. Reference numeral  105  designates a motor which is driven under the control of the AF drive controlling unit  103 . Reference numeral  106  designates a focus lens movable in its optical-axis direction by the drive of the motor  105 . Reference numeral  201  designates a CCD. Reference numeral  202  designates a processing unit for processing an output signal of the CCD  201  and shaping it into a format such as an NTSC signal. Reference numeral  203  designates a recording and reproducing unit for recording a video signal of an output from the processing unit  202  in a record medium, and reproducing a video recorded in the record medium.  
           [0007]    In the above structure, a light beam transmitted through the focus lens  106  is imaged on a pickup surface of the CCD  201 , and the image is sampled and held, and input into the processing unit  202  after photoelectrically converted by the CCD  201 . The processing unit  202  processes the input signal into a video format, such as the NTSC signal, and outputs it into the evaluation value generating unit  102  and the recording and reproducing unit  203 . The video signal output to the evaluation value generating unit  102  undergoes a filtering process and the like in the evaluation value generating unit  102 , and the sharpness evaluation value relevant to a frequency component of the video is thereby generated by a unit of a vertical synchronization period of the video signal. The thus-generated sharpness evaluation value is output into the AF drive controlling unit  103 . The AF drive controlling unit  103  generates the motor control signal for moving the focus lens  106  to a position whereat the sharpness evaluation value becomes maximum, while driving the motor  105  and successively comparing the sharpness evaluation values by a unit of the vertical synchronization period. The AF drive controlling unit  103  thus drives the motor  105  to move the focus lens  106  to its in-focus state. The recording and reproducing unit  203  records the output of the processing unit  202  in the record medium, and reproduces the recorded video image.  
           [0008]    A driving example of such an AF operation will be described. Initially, judgment of a driving direction is performed by judging if the in-focus state is on a far-distance side or a short-distance side relative to a current position of the focus lens  106 . In this judgment, the focus lens is moved by a small amount, and the judgment is performed based on a change of the sharpness evaluation value at the moved position. After that, the focus lens  106  is moved at a certain rate according to the result of the driving direction judgment to detect a peak value of the sharpness evaluation value. This is a so-called hill-climbing method. The moving direction of the focus lens  106  is reversed after the peak value is detected, and the focus lens  106  is moved by a unit of a small amount, and guided such that the sharpness evaluation value can be maximized. This is called a peak judgment. After the peak judgment, the sharpness evaluation value continues to be read, and the read value is compared with a value immediately after the peak judgment. Upon detection of variation of the value, the AF operation is re-started.  
           [0009]    Such a video AF operation in a camera system adopting an interchangeable lens structure is disclosed in EP-762742-A2.  
           [0010]    Further, there exist a group of products (hereinafter referred to as a remote system) for remote operation uses to be used for monitoring, bridal image taking and the like, such as television cameras, video cameras, television lenses, and video lenses. In such a remote system, no AF control is installed, and its structure is constructed such that an operator can operate a switch, a volume switch and the like installed in a remote control unit capable of remote operation, and zooming, iris stop and focusing can be remotely controlled.  
           [0011]    In the remote system, an electrical interface is established between the remote control unit and the camera, and twelve (12) pins are assigned to instruction signals of zooming, iris stop and focusing, control mode signals (switchover between a speed control and a position control), electrical power source, ground and so forth, respectively. Thus, there are no vacant pins in the system.  
           [0012]    An operation example of the remote system will be described with reference to FIG. 4. Portions designated by reference numerals  600 ,  201  to  203 ,  105  and  106  in FIG. 4 are those discussed above with reference to FIG. 3, and accordingly descriptions thereof are omitted.  
           [0013]    In FIG. 4, reference numeral  400  designates a remote control unit for supplying to the camera  600  instruction signals for controlling a zoom lens portion (not shown), an iris stop portion (not shown), and the focus lens  106  provided in the camera  600 , and a switchover signal for performing the switchover between controls of the focus lens  106  by the speed control and the position control. Reference numeral  500  designates a remote control cable connecting the camera  600  and the remote control unit  400 . Reference numeral  107  designates a remote control input terminal for inputting the instruction signal and the switchover signal from the remote control unit  400  into the camera  600  therethrough. Reference numeral  109  designates a manual focus (hereinafter referred to as MF) drive controlling unit for generating a motor control signal for driving the motor  105  from an MF instruction signal from the remote control unit  400 . Reference numeral  110  designates an S/P switchover signal judging unit for outputting to the MF drive controlling unit  109  an S/P switchover instruction signal for instructing whether the control of the focus lens  106  should be executed by the speed control or the position control based on at S/P switchover signal output from an S/P switchover signal inputting unit  402 .  
           [0014]    In the remote control unit  400 , there are arranged an MF instruction signal generating unit  401  for generating the MF instruction signal, which is comprised of the switch, the volume switch and so forth, the S/P switchover signal inputting unit  402  for performing the switchover of the control of the focus lens  106  between the speed control and the position control, and a remote control output terminal  405  for outputting to the camera  600  the instruction signal and the switchover signal from the remote control unit  400 .  
           [0015]    In the above-discussed structure, in accordance with an operation of the MF instruction signal generating unit  401 , the MF instruction signal proportional to this operation is output from the MF instruction signal generating unit  401 , and is input into the MF drive controlling unit  109  through the remote control output terminal  405 , the remote control cable  500 , and the remote control input terminal  107 . Further, the S/P switchover signal for performing the switchover of the control of the focus lens  106  between the speed control and the position control is output from the S/P switchover signal inputting unit  402 , and is input into the S/P switchover signal judging unit  110  through the remote control terminal  405 , the remote control cable  500 , and the remote control input terminal  107 . The S/P switchover signal judging unit  110  judges by which of the speed control and the position control the control of the focus lens  106  should be executed, and its judgment result is output to the MF drive controlling unit  109  as the S/P switchover instruction signal. In the MF drive controlling unit  109 , where the S/P switchover instruction signal is a signal for performing the control of the focus lens  106  by the speed control, the MF instruction signal is treated as a speed control instruction signal, and the motor control signal for driving the motor  105  at such a speed as instructed by the MF instruction signal is generated. The motor  105  is accordingly driven to move the focus lens  106 . On the other hand, where the S/P switchover instruction signal is a signal for performing the control of the focus lens  106  by the position control, the MF instruction signal is treated as a position control instruction signal, and the motor control signal for driving the motor  105  to such a position as instructed by the MF instruction signal is generated. The motor  105  is accordingly driven to move the focus lens  106 .  
           [0016]    In the above-discussed conventional example, however, where the AF control is installed in the remote system, there are no vacant pins at the electrical interface between the remote control unit and the camera. It is therefore impossible to assign to the electrical interface the switchover signal for performing the switchover of the drive of the focus lens between the AF control and the MF control from the remote control unit, and provide in the remote control unit the switchover unit for performing the switchover of the drive of the focus lens between the AF control and the MF control.  
         SUMMARY OF THE INVENTION  
         [0017]    In view of the above disadvantage, it is an object of the present invention to provide a structure which, where an AF control is installed in a remote system, is capable of arrangement in a remote operating apparatus a switchover unit for performing a switchover between drives of a focus lens under an AF control and an MF control, and capable of performing the MF control at the time of the AF control, thereby achieving more advantageous use of the remote system, even in the event that there are no vacant pins at an electrical interface between the remote operating apparatus and an optical apparatus.  
           [0018]    In order to achieve the above object, according to one aspect of the present invention, there is provided an image taking apparatus which includes an optical apparatus provided with a focus detection and focusing controlling unit for controlling a focus lens by an automatic focus detection and focusing control, and a remote operating apparatus provided with a first switchover signal inputting unit for performing a switchover between control of the focus lens by the automatic focus detection and focusing control and control of the focus lens by a remote instruction control, and a second switchover signal inputting unit for performing a switchover between manual operations of the focus lens by a speed control and a position control, and which further includes a switchover signal superposing unit for superposing an output from the first switchover signal inputting unit and an output from the second switchover signal inputting unit.  
           [0019]    Where the AF control is installed in the remote system, the apparatus of the present invention is capable of arrangement in the remote operating unit of the switchover unit for performing the switchover between drives of the focus lens by the AF control and the MF control, and capable of performing the MF control at the time of the AF control, thereby achieving more advantageous use of the remote system, even in the event that there are no vacant pins at the electrical interface between the remote operating unit and the optical apparatus.  
           [0020]    These and further aspects and features of the invention will become apparent from the following detailed description of preferred embodiments thereof in conjunction with the accompanying drawings. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0021]    [0021]FIG. 1 is a block diagram illustrating a first embodiment according to the present invention;  
         [0022]    [0022]FIG. 2 is a block diagram illustrating a second embodiment according to the present invention;  
         [0023]    [0023]FIG. 3 is a block diagram illustrating a conventional example;  
         [0024]    [0024]FIG. 4 is a block diagram illustrating a conventional example;  
         [0025]    [0025]FIG. 5 is a block diagram illustrating a third embodiment according to the present invention;  
         [0026]    [0026]FIG. 6 is a view illustrating a switchover signal from a remote control unit; and  
         [0027]    [0027]FIG. 7 is a block diagram illustrating a fourth embodiment according to the present invention. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0028]    (First Embodiment)  
         [0029]    A first embodiment of the present invention will be described hereinafter with reference to FIG. 1. FIG. 1 shows the structure of an image taking apparatus of the first embodiment.  
         [0030]    In FIG. 1, reference numeral  600  designates a camera having a lens unit, which is incapable of detachable attachment to a camera unit. Reference numeral  400  designates a remote control unit for supplying to the camera  600  instruction signals for controlling a zoom lens portion (not shown), an iris stop portion (not shown), and a focus lens  106  provided in the camera  600  in a remote manner, and a switchover signal for performing a switchover between controls of the, zoom lens portion (not shown), the iris stop portion (not shown), and the focus lens  106  by a speed control and a position control. Reference numeral  500  designates a remote control cable connecting the camera  600  and the remote control unit  400 .  
         [0031]    In the camera  600 , reference numeral  102  designates an evaluation value generating unit for extracting a sharpness evaluation value from a video signal output from a processing unit  202  (described later). Reference numeral  103  designates an AF drive controlling unit for generating a motor control signal such that the sharpness evaluation value generated by the evaluation value generating unit  102  can be maximized. Reference numeral  104  designates an AF/MF switchover unit which is controlled by a switchover judging unit  108  (described later), and performs a switchover of a control signal for driving the focus lens  106  between a control signal from the AF drive controlling unit  103  and a control signal from an MF drive controlling unit  109  (described later). Reference numeral  105  designates a motor which is driven under the control of the AF drive controlling unit  103  or the MF drive controlling unit  109 . Reference numeral  106  designates a focus lens movable in its optical-axis direction by the drive of the motor  105 .  
         [0032]    Reference numeral  107  designates a remote control input terminal for inputting an MF instruction signal and a switchover signal from the remote control unit  400  into the camera  600  therethrough. Reference numeral  108  designates a switchover judging unit which judges if the switchover signal from an AF/MF switchover signal inputting unit  403  (described later) indicates the AF control or the MF control, judges if the control of the focus lens  106  should be executed by a speed control or a position control in a case of the MF control, outputs to the MF drive controlling unit  109  (described later) an S/P switchover instruction signal for instructing the MF drive controlling unit  109  to perform the control of the focus lens  106  by the speed control or the position control, judges if the control of the focus lens  106  should be performed by the AF control or the MF control to accordingly perform the switchover of the AF/MF switchover unit  104 , stores a state of an S/P switchover signal inputting unit  402  prior to the switchover of the AF/MF switchover signal inputting unit  403  to the AF control, and judges if an MF instruction signal generating unit  401  is operated or not.  
         [0033]    Reference numeral  109  designates an MF drive controlling unit for generating, from an MF instruction signal from the remote control unit  400 , a motor control signal for driving the motor  105  such that the control of the focus lens  106  can be executed by the speed control or the position control in accordance with an S/P switchover instruction signal from the switchover signal judging unit  108 . Reference numeral  201  designates a CCD. Reference numeral  202  designates a processing unit for processing an output signal of the CCD  201  and shaping it into a format such as the NTSC signal. Reference numeral  203  designates a recording and reproducing unit for recording a video signal of an output from the processing unit  202  in a record medium, and reproducing a video recorded in the record medium.  
         [0034]    In the remote control unit  400 , reference numeral  401  designates an MF instruction signal generating unit for generating the MF instruction signal, which is comprised of a switch, a volume switch and so forth. Reference numeral  402  designates an S/P switchover signal inputting unit for performing a switchover of the control of the focus lens  106  between the speed control and the position control. Reference numeral  403  designates an AF/MF switchover signal inputting unit for performing a switchover of the drive of the focus lens  106  between the AF control and the MF control. Reference numeral  404  designates an AF/MF state display unit for displaying a condition of the AF control or the MF control under which the focus lens  106  is controlled. Reference numeral  405  designates a switchover signal superposing unit for superposing an output signal from the S/P switchover signal inputting unit  402  and an output signal from the AF/MF switchover signal inputting unit  403 . Reference numeral  406  designates a remote control output terminal for outputting to the camera  600  the MF instruction signal and the switchover signal from the remote control unit  400 .  
         [0035]    In the thus-constructed structure, description will be made to an operation in the event that the AF/MF switchover signal inputting unit  403  is set such that the control of the focus lens  106  can be executed by the AF control, and the MF instruction signal generating unit  401  is not operated.  
         [0036]    A light beam transmitted through the focus lens  106  is imaged on a pickup surface of the CCD  201 , and the image is sampled and held, and input into the processing unit  202  after photoelectrically converted by the CCD  201 . The processing unit  202  processes the input signal into a video format, such as the NTSC signal, and outputs it into the evaluation value generating unit  102  and the recording and reproducing unit  203 . The video signal output to the evaluation value generating unit  102  undergoes a filtering process and the like in the evaluation value generating unit  102 , and the sharpness evaluation value relevant to a frequency component of the video is thereby generated by a unit of a vertical synchronization period of the video signal. The thus-generated sharpness evaluation value is output into the AF drive controlling unit  103 .  
         [0037]    On the other hand, since the AF/MF switchover signal inputting unit  403  in the remote control unit  400  is set such that the focus lens  106  can be driven by the AF control, the AF/MF state display unit  404  displays the AF control, and a switchover signal Vref 3  different from Vref 1  and Vref 2  is input into the switchover signal superposing unit  405 . The switchover signal superposing unit  405  outputs the switchover signal Vref 3  irrespective of the state of the S/P switchover signal inputting unit  402 , and the switchover signal Vref 3  is input into the switchover judging unit  108  through the remote control output terminal  406 , the remote control cable  500  and the remote control input terminal  107 . Since the switchover signal is Vref 3 , the AF/MF switchover judging unit  108  performs the switchover of the AF/MF switchover unit  104  to a side A such that the control of the focus lens  106  can be executed by the AF control. Accordingly, the motor  105  is driven by the motor control signal from the AF drive controlling unit  103 , and the focus lens  106  is hence moved.  
         [0038]    Further, description will be made to an operation in the event that the MF instruction signal generating unit  401  is operated under the above-discussed condition.  
         [0039]    The switchover signal judging unit  108  identifies the fact that the MF instruction signal generating unit  401  is operated under the condition under which the control of the focus lens  106  is executed by the AF control, and the judging unit  108  performs the switchover of the AF/MF switchover unit  104  to a side B. At the same time, the switchover signal judging unit  108  beforehand stores the switchover signal input from the S/P switchover signal inputting unit  402  prior to the switchover of the AF/MF switchover signal inputting unit  403  to the AF control, i.e., the signal for performing the control of the focus lens  106  by the speed control where the switchover signal is Vref 1  different from Vref 2  and Vref 3 , and the signal for performing the control of the focus lens  106  by the position control where the switchover signal is Vref 2  different from Vref 1  and Vref 3 , and outputs to the MF drive controlling unit  109  the S/P switchover instruction signal in accordance with the thus-stored information.  
         [0040]    In the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the speed control, the MF drive controlling unit  109  treats the MF instruction signal as the speed control instruction signal, and generates the motor control signal for driving the motor  105  at a speed instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 . On the other hand, in the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the position control, the MF drive controlling unit  109  treats the MF instruction signal as the position control instruction signal, and generates the motor control signal for driving the motor  105  to a position instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 .  
         [0041]    Finally, description will be made to an operation in the event that the AF/MF switchover signal inputting unit  403  is set such that the focus lens  106  can be driven by the MF control.  
         [0042]    In response to an operation of the MF instruction signal generating unit  401  comprised of the switch, the volume switch and the like in the remote control unit  400 , the MF instruction signal generating unit  401  outputs the MF instruction signal proportional to this operation, and the output signal is input into the MF drive controlling unit  109  through the remote control output terminal  406 , the remote control cable  500 , and the remote control input terminal  107 .  
         [0043]    On the other hand, the switchover signal for performing the switchover of the control of the focus lens  106  between the speed control and the position control is output from the S/P switchover signal inputting unit  402  to the switchover signal superposing unit  405 . Since the AF/MF switchover signal inputting unit  403  is in an OFF state, the switchover signal superposing unit  405  outputs the output signal Vref 1  or Vref 2  from the S/P switchover signal inputting unit  402  as the switchover signal, and the output signal is input into the switchover signal judging unit  108  through the remote control output terminal  406 , the remote control cable  500 , and the remote control input terminal  107 . At this moment, the AF/MF state display unit  404  displays the MF control.  
         [0044]    In the event that the input switchover signal is Vref 1  different from Vref 2  and Vref 3 , the switchover judging unit  108  performs the switchover of the AF/MF switchover unit  104  to the side B such that the control of the focus lens  106  can be executed by the MF control. Further, the switchover judging unit  108  judges that the control of the focus lens  106  should be performed by the speed control, and outputs to the MF drive controlling unit  109  the S/P switchover instruction signal for performing the control of the focus lens  106  by the speed control.  
         [0045]    In the event that the input switchover signal is Vref 2  different from Vref 1  and Vref 3 , the switchover judging unit  108  performs the switchover of the AF/MF switchover unit  104  to the side B such that the control of the focus lens  106  can be executed by the MF control. Further, the switchover judging unit  108  judges that the control of the focus lens  106  should be performed by the position control, and outputs to the MF drive controlling unit  109  the S/P switchover instruction signal for performing the control of the focus lens  106  by the position control.  
         [0046]    In the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the speed control, the MF drive controlling unit  109  treats the MF instruction signal as the speed control instruction signal, and generates the motor control signal for driving the motor  105  at a speed instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 . In contrast thereto, in the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the position control, the MF drive controlling unit  109  treats the MF instruction signal as the position control instruction signal, and generates the motor control signal for driving the motor  105  to a position instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 .  
         [0047]    In this embodiment, display of the AF/MF state display unit  404  is conducted by displaying the state of the AF/MF switchover signal inputting unit  403 , but it is possible to display a condition (the AF control or the MF control) under which the control of the focus lens  106  is performed.  
         [0048]    Further, it is possible to adopt a construction in which the MF instruction signal is taken into the switchover signal superposing unit  405 , and under the condition under which the AF/MF switchover signal inputting unit  403  is set such that the control of the focus lens  106  can be performed by the AF control, the switchover signal superposing unit  405  judges if the MF instruction signal generating unit  401  is operated or not.  
         [0049]    According to the above-discussed construction, where the AF control is installed in the remote system, the construction is capable of arrangement in the remote operating unit of the switchover unit for performing the switchover between the drives of the focus lens under the AF control and the MF control, and capable of performing the MF control at the time of the AF control, thereby achieving more advantageous use of the remote system, even in the event that there are no vacant pins at the electrical interface between the remote operating unit and the optical apparatus.  
         [0050]    (Second Embodiment)  
         [0051]    In the first embodiment, description is made to an example of the camera including the lens unit  100  incapable of detachable attachment to the camera unit. In contrast thereto, a second embodiment of the present invention is directed to an optical apparatus or an image taking apparatus which includes an interchangeable lens unit capable of detachable attachment to a camera unit. The second embodiment will be described hereinafter with reference to FIG. 2. FIG. 2 shows the structure of an image taking apparatus of the second embodiment.  
         [0052]    In FIG. 2, reference numerals  102  to  109 ,  201  to  203 ,  400  to  406  and  500  designate the same corresponding elements as those illustrated in FIG. 1. Accordingly, descriptions thereof are omitted.  
         [0053]    Reference numeral  100  designates a lens unit of an interchangeable lens type, reference numeral  200  designates a camera unit, and reference numeral  300  designates a coaxial cable for video.  
         [0054]    In the lens  100 , reference numeral  101  designates a video input terminal for receiving a video signal through the video coaxial cable  300 .  
         [0055]    In the camera  200 , reference numeral  204  designates an output switchover unit for selecting one of outputs of video signals from the processing unit  202  and the recording and reproducing unit  203 , and outputting the selected one. Reference numeral  205  designates a video output terminal for outputting the output of the video signal from the output switchover unit  204 .  
         [0056]    In the thus-constructed structure, description will be made to an operation in the event that the AF/MF switchover signal inputting unit  403  is set such that the control of the focus lens  106  can be executed by the AF control, and the MF instruction signal generating unit  401  is not operated.  
         [0057]    A light beam transmitted through the focus lens  106  is imaged on a pickup surface of the CCD  201 , and the image is sampled and held, and input into the processing unit  202  after photoelectrically converted by the CCD  201 . The processing unit  202  processes the input signal into a video format, such as the NTSC signal, and outputs it into the output switchover unit  204  and the recording and reproducing unit  203 . At the time of recording, the output switchover unit  204  outputs the output of the processing unit  202  to the video output terminal  205 , and the recording and reproducing unit  203  records the output of the processing unit  202  in a record medium. At the time of reproduction, the recording and reproducing unit  203  reproduces a video signal recorded in the record medium, and when the video signal is stably reproduced, the output switchover unit  204  outputs the video signal of the recording and reproducing unit  203  to the video output terminal  205 .  
         [0058]    Into the video input terminal  101  of the lens  100 , the video signal from the video output terminal  205  of the camera  200  is input through the video coaxial cable  300 . The video signal input into the video input terminal  101  undergoes a filtering process and the like in the evaluation value generating unit  102 , and the sharpness evaluation value relevant to a frequency component of the video is thereby generated by a unit of a vertical synchronization period of the video signal. The thus-generated sharpness evaluation value is output into the AF drive controlling unit  103 .  
         [0059]    On the other hand, since the AF/MF switchover signal inputting unit  403  in the remote control unit  400  is set such that the focus lens  106  can be driven by the AF control, the AF/MF state display unit  404  displays the AF control, and a switchover signal Vref 3  different from Vref 1  and Vref 2  is input into the switchover signal superposing unit  405 . The switchover signal superposing unit  405  outputs the switchover signal Vref 3  irrespective of the state of the S/P switchover signal inputting unit  402 , and the switchover signal Vref 3  is input into the switchover judging unit  108  through the remote control output terminal  406 , the remote control cable  500  and the remote control input terminal  107 . Since the switchover signal is Vref 3 , the AF/MF switchover judging unit  108  performs the switchover of the AF/MF switchover unit  104  to a side A such that the control of the focus lens  106  can be executed by the AF control. Accordingly, the motor  105  is driven by the motor control signal from the AF drive controlling unit  103 , and the focus lens  106  is hence moved.  
         [0060]    Further, description will be made to an operation in the event that the MF instruction signal generating unit  401  is operated under the above-discussed condition.  
         [0061]    The switchover signal judging unit  108  identifies the fact that the MF instruction signal generating unit  401  is operated under the condition under which the control of the focus lens  106  is executed by the AF control, and the judging unit  108  performs the switchover of the AF/MF switchover unit  104  to a side B. At the same time, the switchover signal judging unit  108  beforehand stores the switchover signal input from the S/P switchover signal inputting unit  402  prior to the switchover of the AF/MF switchover signal inputting unit  403  to the AF control, i.e., the signal for performing the control of the focus lens  106  by the speed control where the switchover signal is Vref 1  different from Vref 2  and Vref 3 , and the signal for performing the control of the focus lens  106  by the position control where the switchover signal is Vref 2  different from Vref 1  and Vref 3 , and outputs to the MF drive controlling unit  109  the S/P switchover instruction signal in accordance with the thus-stored information.  
         [0062]    In the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the speed control, the MF drive controlling unit  109  treats the MF instruction signal as the speed control instruction signal, and generates the motor control signal for driving the motor  105  at a speed instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 . On the other hand, in the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the position control, the MF drive controlling unit  109  treats the MF instruction signal as the position control instruction signal, and generates the motor control signal for driving the motor  105  to a position instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 .  
         [0063]    Finally, description will be will be made to an operation in the event that the AF/MF switchover signal inputting unit  403  is set such that the focus lens  106  can be driven by the MF control.  
         [0064]    In response to an operation of the MF instruction signal generating unit  401  comprised of the switch, the volume switch and the like in the remote control unit  400 , the MF instruction signal generating unit  401  outputs the MF instruction signal proportional to this operation, and the output signal is input into the MF drive controlling unit  109  through the remote control output terminal  406 , the remote control cable  500 , and the remote control input terminal  107 .  
         [0065]    On the other hand, the switchover signal for performing the switchover of the control of the focus lens  106  between the speed control and the position control is output from the S/P switchover signal inputting unit  402  to the switchover signal superposing unit  405 . Since the AF/MF switchover signal inputting unit  403  is in an OFF state, the switchover signal superposing unit  405  outputs the output signal Vref 1  or Vref 2  from the S/P switchover signal inputting unit  402  as the switchover signal, and the output signal is input into the switchover signal judging unit  108  through the remote control output terminal  406 , the remote control cable  500 , and the remote control input terminal  107 . At this moment, the AF/MF state display unit  404  displays the MF control.  
         [0066]    In the event that the input switchover signal is Vref 1  different from Vref 2  and Vref 3 , the switchover judging unit  108  performs the switchover of the AF/MF switchover unit  104  to the side B such that the control of the focus lens  106  can be executed by the MF control. Further, the switchover judging unit  108  judges that the control of the focus lens  106  should be performed by the speed control, and outputs to the MF drive controlling unit  109  the S/P switchover instruction signal for performing the control of the focus lens  106  by the speed control.  
         [0067]    In the event that the input switchover signal is Vref 2  different from Vref 1  and Vref 3 , the switchover judging unit  108  performs the switchover of the AF/MF switchover unit  104  to the side B such that the control of the focus lens  106  can be executed by the MF control. Further, the switchover judging unit  108  judges that the control of the focus lens  106  should be performed by the position control, and outputs to the MF drive controlling unit  109  the S/P switchover instruction signal for performing the control of the focus lens  106  by the position control.  
         [0068]    In the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the speed control, the MF drive controlling unit  109  treats the MF instruction signal as the speed control instruction signal, and generates the motor control signal for driving the motor  105  at a speed instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 . In contrast thereto, in the event that the S/P switchover instruction signal is the signal for performing the control of the focus, lens  106  by the position control, the MF drive controlling unit  109  treats the MF instruction signal as the position control instruction signal, and generates the motor control signal for driving the motor  105  to a position instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 .  
         [0069]    In the second embodiment, display of the AF/MF state display unit  404  is conducted by displaying the state of the AF/MF switchover signal inputting unit  403 , but it is possible to display a condition (the AF control or the MF control) under which the control of the focus lens  106  is performed.  
         [0070]    Further, it is possible to adopt a construction in which the MF instruction signal is taken into the switchover signal superposing unit  405 , and under the condition under which the AF/MF switchover signal inputting unit  403  is set such that the control of the focus lens  106  can be performed by the AF control, the switchover signal superposing unit  405  judges if the MF instruction signal generating unit  401  is operated or not.  
         [0071]    According to the above-discussed construction, where the AF control is installed in the remote system, the construction is capable of arrangement in the remote operating unit of the switchover unit for performing the switchover between the drives of the focus lens under the AF control and the MF control, and capable of performing the MF control at the time of the AF control, thereby achieving more advantageous use of the remote system, even in the event that there are no vacant pins at the electrical interface between the remote operating unit and the optical apparatus.  
         [0072]    (Third Embodiment)  
         [0073]    A third embodiment of the present invention will be described hereinafter with reference to FIG. 5. FIG. 5 shows the structure of an image taking apparatus of the third embodiment.  
         [0074]    In FIG. 5, reference numeral  600  designates a camera having a lens unit which is incapable of detachable attachment to a camera unit. Reference numeral  400  designates a remote control unit for supplying to the camera  600  instruction signals for controlling a zoom lens portion (not shown), an iris stop portion (not shown), and a focus lens  106  provided in the camera  600  in a remote manner, and a switchover signal for performing a switchover between controls of the zoom lens portion (not shown), the iris stop portion (not shown), and the focus lens  106  by a speed control and a position control. Reference numeral  500  designates a remote control cable connecting the camera  600  and the remote control unit  400 .  
         [0075]    In the camera  600 , reference numeral  102  designates an evaluation value generating unit for extracting a sharpness evaluation value from a video signal output from a processing unit  202  (described later). Reference numeral  103  designates an AF drive controlling unit for generating a motor control signal such that the sharpness evaluation value generated by the evaluation value generating unit  102  can be maximized. Reference numeral  104  designates an AF/MF switchover unit which is controlled by a switchover judging unit (described later), and performs a switchover of a control signal for driving the focus lens between a control signal from the AF drive controlling unit  103  and a control signal from an MF drive controlling unit  109 . Reference numeral  105  designates a motor which is driven under the control of the AF drive controlling unit  103  or the MF drive controlling unit  109 . Reference numeral  106  designates a focus lens movable in its optical-axis direction by the drive of the motor  105 .  
         [0076]    Reference numeral  107  designates a remote control input terminal for inputting an MF instruction signal and a switchover signal from the remote control unit  400  into the camera  600  therethrough. Reference numeral  108  designates a switchover judging unit which judges if a switchover signal from an AF/MF switchover signal inputting unit  403  (described later) indicates an AF control or an MF control, judges if the control of the focus lens  106  should be executed by a speed control or a position control in a case of the MF control, outputs to an MF drive controlling unit  109  (described later) an S/P switchover instruction signal for instructing the MF drive controlling unit  109  to perform the control of the focus lens  106  by the speed control or the position control, judges if the control of the focus lens  106  should be performed by the AF control or the MF control to accordingly control the switchover of the AF/MF switchover unit, stores a state of the S/P switchover signal inputting unit  402  prior to the switchover of the AF/MF switchover signal inputting unit  403  to the AF control, and judges if the MF instruction signal generating unit  401  is operated or not.  
         [0077]    Reference numeral  109  designates an MF drive controlling unit for generating, from the MF instruction signal from the remote control unit  400 , a motor control signal for driving the motor  105  such that the control of the focus lens  106  can be executed by the speed control or the position control in accordance with the S/P switchover instruction signal from the switchover signal judging unit  108 . Reference numeral  201  designates a CCD. Reference numeral  202  designates a processing unit for processing an output signal of the CCD  201  and shaping it into a format such as the NTSC signal. Reference numeral  203  designates a recording and reproducing unit for recording a video signal of an output from the processing unit  202  in a record medium, and reproducing a video recorded in the record medium.  
         [0078]    In the remote control unit  400 , reference numeral  401  designates an MF instruction signal generating unit for generating the MF instruction signal, which is composed of a switch, a volume switch and so forth. Reference numeral  402  designates an S/P switchover signal inputting unit for performing a switchover of the control of the focus lens  106  between the speed control and the position control. Reference numeral  403  designates an AF/MF switchover signal inputting unit for performing a switchover of the drive of the focus lens between the AF control and the MF control in a momentary operation manner. Reference numeral  404  designates an AF/MF state display unit for displaying a condition of the AF control or the MF control under which the focus lens  106  is controlled. Reference numeral  405  designates a remote control output terminal for outputting to the camera  600  the MF instruction signal and the switchover signal from the remote control unit  400 .  
         [0079]    In the thus-constructed structure, description will be described to states of the S/P switchover signal and the AF control operation of a switchover signal output from the remote control unit  400 , with reference to FIG. 6.  
         [0080]    In FIG. 6, a solid line indicates the switchover signal output from the remote control unit  400 , a dotted line indicates a voltage level of the switchover signal, and the state of the S/P switchover signal of the switchover signal and the state of the AF control operation of the switchover signal are represented.  
         [0081]    As the output signal from the S/P switchover inputting unit  402 , Vref 1  different from Verf 2  and Vref 3 , or Vref 2  different from Verf 1  and Vref 3  is output. Here, Vref 1  is a signal for showing that the control of the focus lens  106  should be executed by the speed control, and Vref 2  is a signal for showing that the control of the focus lens  106  should be executed by the position control. Further, each time the AF/MF switchover signal inputting unit  403  is switched to Vref 3  by the momentary operation, the AF/MF switchover unit  104  is switched according to the judgment of the AF/MF switchover judging unit  108 . Thus, the AF control and the MF control are alternately repeated.  
         [0082]    The state of the S/P switchover signal will be described. In sections A and C in which the switchover signal is Vref 1 , the speed control is selected as the control of the focus lens  106 . In contrast, in a section B in which the switchover signal is Vref 2 , the position control is selected as the control of the focus lens  106 .  
         [0083]    Next, the state of the AF control operation will be described. In the sections a and c, the AF control is in an OFF state. In contrast, in a section b, the AF control is in an ON state.  
         [0084]    In the OFF state of the AF control, the condition of the S/P switchover signal is operative, and the MF control is executed by the MF instruction signal from the MF instruction signal generating unit  401 .  
         [0085]    Even in the ON state of the AF control, when the MF instruction signal generating unit  401  is operated, the condition of the S/P switchover signal becomes operative, and the MF control is executed by the MF instruction signal from the MF instruction signal generating unit  401 .  
         [0086]    Description will now be made to an operation in the event that the AF/MF switchover signal inputting unit  403  is operated and set such that the control of the focus lens  106  can be executed by the AF control, and the MF instruction signal generating unit  401  is not operated.  
         [0087]    A light beam transmitted through the focus lens  106  is imaged on a pickup surface of the CCD  201 , and the image is sampled and held, and input into the processing unit  202  after photoelectrically converted by the CCD  201 . The processing unit  202  processes the input signal into a video format, such as the NTSC signal, and outputs it into the evaluation value generating unit  102  and the recording and reproducing unit  203 . The video signal output to the evaluation value generating unit  102  undergoes a filtering process and the like in the evaluation value generating unit  102 , and the sharpness evaluation value relevant to a frequency component of the video is thereby generated by a unit of a vertical synchronization period of the video signal. The thus-generated sharpness evaluation value is output into the AF drive controlling unit  103 .  
         [0088]    On the other hand, since the AF/MF switchover signal inputting unit  403  in the remote control unit  400  is set such that the focus lens  106  can be driven by the AF control, the AF/MF state display unit  404  displays the AF control, and a switchover signal Vref 3  different from Vref 1  and Vref 2  is output. The switchover signal Vref 3  is input into the switchover judging unit  108  through the remote control output terminal  405 , the remote control cable  500  and the remote control input terminal  107 . Since the switchover signal is Vref 3 , the AF/MF switchover judging unit  108  performs the switchover of the AF/MF switchover unit  104  to a side A such that the control of the focus lens  106  can be executed by the AF control. Accordingly, the motor  105  is driven by the motor control signal from the AF drive controlling unit  103 , and the focus lens  106  is hence moved.  
         [0089]    Further, description will be made to an operation in the event that the MF instruction signal generating unit  401  is operated under the above-discussed condition.  
         [0090]    The switchover signal judging unit  108  identifies the fact that the MF instruction signal generating unit  401  is operated under the condition under which the control of the focus lens  106  is executed by the AF control, and the judging unit  108  performs the switchover of the AF/MF switchover unit  104  to a side B. At the same time, the switchover signal judging unit  108  beforehand stores the switchover signal input from the S/P switchover signal inputting unit  402  prior to the switchover of the AF/MF switchover signal inputting unit  403  to the AF control, i.e., the signal for performing the control of the focus lens  106  by the speed control where the switchover signal is Vref 1  different from Vref 2  and Vref 3 , and the signal for performing the control of the focus lens  106  by the position control where the switchover signal is Vref 2  different from Vref 1  and Vref 3 , and outputs to the MF drive controlling unit  109  the S/P switchover instruction signal in accordance with the thus-stored information.  
         [0091]    In the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the speed control, the MF drive controlling unit  109  treats the MF instruction signal as the speed control instruction signal, and generates the motor control signal for driving the motor  105  at a speed instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 . On the other hand, in the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the position control, the MF drive controlling unit  109  treats the MF instruction signal as the position control instruction signal, and generates the motor control signal for driving the motor  105  to a position instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 .  
         [0092]    Finally, description will be made to an operation in the event that the AF/MF switchover signal inputting unit  403  is operated and set such that the focus lens  106  can be driven by the MF control.  
         [0093]    In response to an operation of the MF instruction signal generating unit  401  comprised of the switch, the volume switch and the like in the remote control unit  400 , the MF instruction signal generating unit  401  outputs the MF instruction signal proportional to this operation, and the output signal is input into the MF drive controlling unit  109  through the remote control output terminal  405 , the remote control cable  500 , and the remote control input terminal  107 .  
         [0094]    On the other hand, the switchover signal for performing the switchover of the control of the focus lens  106  between the speed control and the position control is output from the S/P switchover signal inputting unit  402 . The switchover signal is input into the switchover signal judging unit  108  through the AF/MF switchover signal inputting unit  403 , the remote control output terminal  405 , the remote control cable  500 , and the remote control input terminal  107 . At this moment, the AF/MF state display unit  404  displays the MF control.  
         [0095]    In the event that the input switchover signal is Vref 1  different from Vref 2  and Vref 3 , the switchover judging unit  108  performs the switchover of the AF/MF switchover unit  104  to the side B such that the control of the focus lens  106  can be executed by the MF control. Further, the switchover judging unit  108  judges that the control of the focus lens  106  should be performed by the speed control, and outputs to the MF drive controlling unit  109  the S/P switchover instruction signal for performing the control of the focus lens  106  by the speed control.  
         [0096]    In the event that the input switchover signal is Vref 2  different from Vref 1  and Vref 3 , the switchover judging unit  108  performs the switchover of the AF/MF switchover unit  104  to the side B such that the control of the focus lens  106  can be executed by the MF control. Further, the switchover judging unit  108  judges that the control of the focus lens  106  should be performed by the position control, and outputs to the MF drive controlling unit  109  the S/P switchover instruction signal for performing the control of the focus lens  106  by the position control.  
         [0097]    In the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the speed control, the MF drive controlling unit  109  treats the MF instruction signal as the speed control instruction signal, and generates the motor control signal for driving the motor  105  at a speed instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 . In contrast thereto, in the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the position control, the MF drive controlling unit  109  treats the MF instruction signal as the position control instruction signal, and generates the motor control signal for driving the motor  105  to a position instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 .  
         [0098]    According to the above-discussed construction, where the AF control is installed in the remote system, the construction is capable of arrangement in the remote operating unit of the switchover unit for performing the switchover between the drives of the focus lens under the AF control and the MF control, and capable of performing the MF control at the time of the AF control, thereby achieving more advantageous use of the remote system, even in the event that there are no vacant pins at the electrical interface between the remote operating unit and the optical apparatus.  
         [0099]    (Fourth Embodiment)  
         [0100]    In the third embodiment, description is made to an example of the camera including the lens unit incapable of detachable attachment to the camera unit. In contrast thereto, a fourth embodiment of the present invention is directed to an optical apparatus or an image taking apparatus which includes an interchangeable lens unit capable of detachable attachment to a camera unit. The fourth embodiment will be described hereinafter with reference to FIG. 7. FIG. 7 shows the structure of an image taking apparatus of the fourth embodiment.  
         [0101]    In FIG. 7, reference numerals  102  to  109 ,  201  to  203 ,  400  to  406  and  500  designate the same corresponding elements as those previously discussed. Accordingly, descriptions thereof are omitted. Description of the switchover signal is also omitted since it is previously discussed.  
         [0102]    Reference numeral  100  designates a lens unit of an interchangeable lens type, reference numeral  200  designates a camera unit, and reference numeral  300  designates a coaxial cable for video.  
         [0103]    In the lens  100 , reference numeral  101  designates a video input terminal for receiving a video signal through the video coaxial cable  300 .  
         [0104]    In the camera  200 , reference numeral  204  designates an output switchover unit for selecting one of outputs of video signals from the processing unit  202  and the recording and reproducing unit  203 , and outputting the selected output. Reference numeral  205  designates a video output terminal for outputting the output of the video signal from the output switchover unit  204 .  
         [0105]    In the thus-constructed structure, description will be made to an operation in the event that the AF/MF switchover signal inputting unit  403  is operated and set such that the control of the focus lens  106  can be executed by the AF control, and the MF instruction signal generating unit  401  is not operated.  
         [0106]    A light beam transmitted through the focus lens  106  is imaged on a pickup surface of the CCD  201 , and the image is sampled and held, and input into the processing unit  202  after photoelectrically converted by the CCD  201 . The processing unit  202  processes the input signal into a video format, such as the NTSC signal, and outputs it into the output switchover unit  204  and the recording and reproducing unit  203 . At the time of recording, the output switchover unit  204  outputs the output of the processing unit  202  to the video output terminal  205 , and the recording and reproducing unit  203  records the output of the processing unit  202  in a record medium. At the time of reproduction, the recording and reproducing unit  203  reproduces a video signal recorded in the record medium, and when the video is stably reproduced, the output switchover unit  204  outputs the video signal of the recording and reproducing unit  203  to the video output terminal  205 .  
         [0107]    Into the video input terminal  101  of the lens  100 , the video signal from the video output terminal  205  of the camera  200  is input through the video coaxial cable  300 . The video signal input into the video input terminal  101  undergoes a filtering process and the like in the evaluation value generating unit  102 , and the sharpness evaluation value relevant to a frequency component of the video is thereby generated by a unit of a vertical synchronization period of the video signal. The thus-generated sharpness evaluation value is output into the AF drive controlling unit  103 .  
         [0108]    On the other hand, since the AF/MF switchover signal inputting unit  403  in the remote control unit  400  is operated and set such that the focus lens  106  can be driven by the AF control, the AF/MF state display unit  404  displays the AF control, and a switchover signal Vref 3  different from Vref 1  and Vref 2  is output. The switchover signal Vref 3  is input into the switchover judging unit  108  through the remote control output terminal  405 , the remote control cable  500  and the remote control input terminal  107 . Since the switchover signal is Vref 3 , the AF/MF switchover judging unit  108  performs the switchover of the AF/MF switchover unit  104  to a side A such that the control of the focus lens  106  can be executed by the AF control. Accordingly, the motor  105  is driven by the motor control signal from the AF drive controlling unit  103 , and the focus lens  106  is hence moved.  
         [0109]    Further, description will be made to an operation in the event that the MF instruction signal generating unit  401  is operated under the above-discussed condition.  
         [0110]    The switchover signal judging unit  108  identifies the fact that the MF instruction signal generating unit  401  is operated under the condition under which the control of the focus lens  106  is executed by the AF control, and the judging unit  108  performs the switchover of the AF/MF switchover unit  104  to a side B. At the same time, the switchover signal judging unit  108  beforehand stores the switchover signal input from the S/P switchover signal inputting unit  402  prior to the switchover of the AF/MF switchover signal inputting unit  403  to the AF control, i.e., the signal for performing the control of the focus lens  106  by the speed control where the switchover signal is Vref 1  different from Vref 2  and Vref 3 , and the signal for performing the control of the focus lens  106  by the position control where the switchover signal is Vref 2  different from Vref 1  and Vref 3 , and outputs to the MF drive controlling unit  109  the S/P switchover instruction signal in accordance with the thus-stored information.  
         [0111]    In the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the speed control, the MF drive controlling unit  109  treats the MF instruction signal as the speed control instruction signal, and generates the motor control signal for driving the motor  105  at a speed instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 . On the other hand, in the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the position control, the MF drive controlling unit  109  treats the MF instruction signal as the position control instruction signal, and generates the motor control signal for driving the motor  105  to a position instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 .  
         [0112]    Finally, description will be will be made to an operation in the event that the AF/MF switchover signal inputting unit  403  is operated and set such that the focus lens  106  can be driven by the MF control.  
         [0113]    In response to an operation of the MF instruction signal generating unit  401  comprised of the switch, the volume switch and the like in the remote control unit  400 , the MF instruction signal generating unit  401  outputs the MF instruction signal proportional to this operation, and the output signal is input into the MF drive controlling unit  109  through the remote control output terminal  405 , the remote control cable  500 , and the remote control input terminal  107 .  
         [0114]    On the other hand, the switchover signal for performing the switchover of the control of the focus lens  106  between the speed control and the position control is output from the S/P switchover signal inputting unit  402 . The switchover signal is input into the switchover signal judging unit  108  through the AF/MF switchover signal inputting unit  403 , the remote control output terminal  405 , the remote control cable  500 , and the remote control input terminal  107 . At this moment, the AF/MF state display unit  404  displays the MF control.  
         [0115]    In the event that the input switchover signal is Vref 1  different from Vref 2  and Vref 3 , the switchover judging unit  108  performs the switchover of the AF/MF switchover unit  104  to the side B such that the control of the focus lens  106  can be executed by the MF control. Further, the switchover judging unit  108  judges that the control of the focus lens  106  should be performed by the speed control, and outputs to the MF drive controlling unit  109  the S/P switchover instruction signal for performing the control of the focus lens  106  by the speed control.  
         [0116]    In the event that the input switchover signal is Vref 2  different from Vref 1  and Vref 3 , the switchover judging unit  108  performs the switchover of the AF/MF switchover unit  104  to the side B such that the control of the focus lens  106  can be executed by the MF control. Further, the switchover judging unit  108  judges that the control of the focus lens  106  should be performed by the position control, and outputs to the MF drive controlling unit  109  the S/P switchover instruction signal for performing the control of the focus lens  106  by the position control.  
         [0117]    In the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the speed control, the MF drive controlling unit  109  treats the MF instruction signal as the speed control instruction signal, and generates the motor control signal for driving the motor  105  at a speed instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 . In contrast thereto, in the event that the S/P switchover instruction signal is the signal for performing the control of the focus lens  106  by the position control, the MF drive controlling unit  109  treats the MF instruction signal as the position control instruction signal, and generates the motor control signal for driving the motor  105  to a position instructed by the MF instruction signal. Thus, the motor  105  is accordingly driven to move the focus lens  106 .  
         [0118]    According to the above-discussed construction, where the AF control is installed in the remote system, the construction is capable of arrangement in the remote operating unit of the switchover unit for performing the switchover between the drives of the focus lens under the AF control and the MF control, and capable of performing the MF control at the time of the AF control, thereby achieving more advantageous use of the remote system, even in the event that there are no vacant pins at the electrical interface between the remote operating unit and the optical apparatus.  
         [0119]    While the present invention has been described with reference to what are presently considered to be the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. On the contrary, the invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.