JP4072224B2 - Lens control apparatus, method, and computer-readable recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens control apparatus and method for controlling a lens position in a camera equipped with an inner focus type lens system, and a computer-readable recording medium used in the apparatus and method.
[0002]
[Prior art]
FIG. 6 shows a simple configuration of a conventionally used inner focus type lens system. In FIG. 6, reference numeral 101 denotes a fixed first lens group, reference numeral 102 denotes a second lens group that performs zooming (magnification lens, variator lens, zoom lens), reference numeral 103 denotes a stop, and reference numeral 104 denotes a fixed third lens group. A lens group 105 includes a focus adjustment function and a fourth lens group (focus lens) having a so-called competition function for correcting movement of the focal plane due to zooming, and 106 is an image sensor such as a CCD. As is well known, in the lens system configured as shown in FIG. 6, the focus lens 105 has both a competition function and a focus adjustment function. The position of the focus lens 105 for doing so varies depending on the subject distance.
[0003]
When the subject distance is changed at each focal length, the position of the focus lens 105 for focusing on the imaging surface is continuously plotted as shown in FIG. During zooming, if the locus shown in FIG. 7 is selected according to the subject distance and the focus lens 105 is moved along this locus, zoom without blurring becomes possible.
[0004]
In the front lens focus type lens system, a compensator lens independent from the variable power lens is provided, and the variable power lens and the compensator lens are coupled by a mechanical cam ring. Therefore, for example, when a knob for manual zoom is provided on this cam ring and the focal length is changed manually, the cam ring will follow and rotate regardless of how fast the knob is moved. Moves along the cam groove of the cam ring, so that if the focus lens is in focus, the above operation does not cause blur.
[0005]
In the control of the inner focus type lens system having the above-described characteristics, a plurality of pieces of locus information shown in FIG. 7 are stored in some form in the lens control microcomputer, and the positions of the focus lens and the variable magnification lens are stored. In general, a trajectory is selected, and zooming is performed while following the selected trajectory.
[0006]
In addition, in order to read out the position of the focus lens relative to the position of the variable power lens from the storage element and use it for lens control, the position of each lens must be read with a certain degree of accuracy. In particular, as is apparent from FIG. 7, when the variable magnification lens moves at a constant speed or a speed close thereto, the inclination of the locus of the focus lens changes with the change of the focal length. This indicates that the moving speed and the moving direction of the focus lens change every moment. In other words, the actuator of the focus lens must respond with a high speed response from 1 Hz to several hundred Hz.
[0007]
As an actuator that satisfies the above requirements, it is becoming common to use a stepping motor for the focus lens group of the inner focus type lens system. The stepping motor rotates in complete synchronization with the stepping pulse output from the lens control microcomputer, etc., and the stepping motor has a constant stepping angle, so high speed response, stopping accuracy and position accuracy can be obtained. Can do.
In addition, when using a stepping motor, since the rotation angle with respect to the number of stepping pulses is constant, the stepping pulse can be used as an incremental encoder as it is, and there is an advantage that a special position encoder need not be added. is there.
[0008]
As described above, when the stepping motor is used to perform the zooming operation while maintaining the in-focus state, the locus information in FIG. It is necessary to read the locus information corresponding to the position or moving speed of the variable magnification lens and move the focus lens based on the information.
[0009]
As described above, the stored zoom tracking data is created based on the optical design value, but in reality, this locus does not match the design value due to an error in the focal length of each lens group. For this reason, in an actual video camera, an operation for adjusting which position of the variator lens the tele end and the wide end of the stored data corresponds to is performed.
[0010]
In this method, the stroke of the variator lens from the tele end to the wide end is kept as designed, and the focus position difference (balance) between the tele end and the wide end focus lens at the adjustment distance (for example, ∞) is also designed. There is known a method of obtaining a value and setting it to a tele end and a wide end. Here, this is referred to as constant stroke adjustment.
[0011]
In addition, the difference (balance) between the focus positions of the focus lens at the tele end and the wide end is set as a design value, and the position at which the focus lens reaches the highest point on the map at the middle (intermediate focal length) A method is known in which a variator lens position at which the amount of movement from the focus lens position becomes a design value is obtained and used as the positions of the telephoto end and wide end variator lenses. Here, this is referred to as tele-middle tracking adjustment.
[0012]
Next, the situation when the trajectory of the tele end position and the wide end position is as designed when the tele-middle tracking adjustment is performed will be described with reference to FIG.
In FIG. 3, the horizontal axis indicates the position of the variator lens (that is, the focal length), and the vertical axis indicates the position of the focus lens. Note that, at the adjustment distance (for example, ∞) here, the difference between the design focus positions of the focus lens at the tele end T and the wide end W is zero.
[0013]
When the tele-middle tracking adjustment is performed, the point {circle around (1)} on the map becomes the adjustment start point. From here, the focus lens is lowered downward in the figure by the movement amount A of the design value of the focus lens. This position becomes (2). When the variator lens is moved from this state and the in-focus position is obtained, {circle over (5)} is obtained, and this is set as the tele-end variator position. In this example, as described above, since the difference between the focus lens focusing positions at the tele end and the wide end is zero, the position (6) where the variator lens is moved and focused is the variator position at the wide end.
[0014]
[Problems to be solved by the invention]
Recently, in order to increase the zoom speed between tele and wide, there is a movement to increase the rotation amount per pulse of the stepping motor. As a result, the number of pulses is reduced even when the stroke length between tele and wide is the same, so that the zoom speed between tele and wide can be increased even at the same stepping motor speed. However, an increase in the amount of movement (rotation amount) of one pulse means that the amount of blur during the movement of one pulse also increases, making it difficult to find the true focal point.
[0015]
FIG. 4 shows the relationship between the focus and the zoom lens position at the tele end. The subject distance here is assumed to be infinite. Here, the position of the tele end on the optical is (1). However, in the case of a stepping motor, it cannot be stopped linearly and can only be stopped in increments of one pulse. Therefore, if the amount of movement of one pulse is tmm in FIG. 4, the range that can stop as the tele end is from (2) to (3), and the focus position at this time is also a large range from (2) to (3) Has 2 * smm. Therefore, when the zoom lens is stopped at (2) or (3), it cannot be focused even if the focus lens is used for focusing and the focus is moved by the balance amount A in FIG. A cannot be balanced, and there is a problem that the true focal point at the position of the telephoto end T shown in FIG. 3 is different from the stored point of the cam locus.
[0016]
Accordingly, an object of the present invention is to increase the zoom speed by reducing the number of pulses between the tele end and the wide end of the zoom, and to enable the follow-up of the cam locus without blur.
[0017]
[Means for Solving the Problems]
In the lens control apparatus according to the present invention, the first lens means for performing the zooming operation and the second lens means for correcting the movement of the focal plane when the first lens means is moved. A lens control device having a positional relationship adjustment function at least at one of the tele end and the wide end, wherein the first control unit controls the movement of the first lens unit, and the first lens unit A second control means for controlling the movement of the second lens means for correcting the movement of the focal plane during the movement based on a positional relationship with the position of the first lens means stored in advance; Adjusting means for adjusting the relationship, the adjusting means being moved earlier by the second control means based on the previously stored positional relationship between the first lens means and the second lens means. Said The first lens means is moved by the first control means so as to be focused at the position of the second lens means, and the second lens means is focused at the position of the moved first lens means. The positional relationship is adjusted based on in-focus position information of the second lens means obtained by moving the second lens means by the control means.
In another lens control device according to the present invention, a first lens unit for performing a zooming operation and a second unit for correcting the movement of the focal plane when the first lens unit is moved. A lens control device having a function of adjusting a positional relationship with at least one of a tele end and a wide end with respect to a lens unit, the first control unit controlling movement of the first lens unit, and the first Of the second lens means for correcting the movement of the focal plane during the movement of the lens means based on the positional relationship between the position of the first lens means and the position of the second lens means stored in advance. Second control means for controlling movement, and the first control means is first moved based on the previously stored positional relationship between the first lens means and the second lens means. Said second lens hand The first lens means is moved so as to be in focus at the position, and the second control means is focused at the position of the first lens means moved by the first control means. The focus adjustment is performed by moving the second lens unit to the position of the second lens unit while obtaining an evaluation value related to contrast.
[0018]
In the lens control method according to the present invention, the position of the first lens means for performing the zooming operation stored in advance and the movement of the focal plane when the first lens means is moved are corrected. A lens control method for adjusting a positional relationship between at least one of a tele end and a wide end with a position of a second lens unit, the first lens unit and the second lens stored in advance Based on the positional relationship with the means, the first lens means is moved by the first control means so as to be focused at the position of the second lens means previously moved by the second control means. Then, the in-focus position of the second lens means obtained by moving the second lens means by the second control means so as to be in focus at the position of the moved first lens means. Information Zui and is characterized by adjusting the positional relationship between the position of the first lens unit and the second lens means the previously stored.
Further, in another lens control method according to the present invention, the position of the first lens means for performing the zooming operation stored in advance and the movement of the focal plane when the first lens means is moved are corrected. A lens control method for adjusting a positional relationship between at least one of a tele end and a wide end with respect to a position of a second lens means for performing the above-mentioned first lens means stored in advance and A first control for moving the first lens means so as to be in focus at the position of the second lens means previously moved based on a positional relationship with the second lens means; The second lens unit is moved while obtaining an evaluation value related to contrast at the position of the second lens unit that is in focus at the position of the first lens unit moved by the control step. It is characterized by performing a second control for adjusting the focus.
[0019]
In the computer-readable recording medium according to the present invention, the position of the first lens means for performing the zooming operation stored in advance and the movement of the focal plane during the movement of the first lens means are corrected. A computer-readable recording medium recorded with a computer program for adjusting a positional relationship at least at one of the tele end and the wide end with the position of the second lens means for Based on the positional relationship between the first lens means and the second lens means stored in advance, focusing is performed at the position of the second lens means previously moved by the second control means. The first lens unit is moved by the first control unit, and the second lens unit is brought into focus at the position of the moved first lens unit. Based on the in-focus position information of the second lens means obtained by moving the second lens means by the control means, the positions of the first lens means and the second lens means stored in advance. The computer program for making a computer perform the process which adjusts the positional relationship is characterized by the above-mentioned.
In another computer-readable recording medium according to the present invention, the position of the first lens means for performing a zooming operation stored in advance and the movement of the focal plane during the movement of the first lens means. A computer-readable recording medium having recorded thereon a computer program for adjusting a positional relationship at least at one of the tele end and the wide end with the position of the second lens means for correcting Then, the first lens unit is brought into focus at the position of the second lens unit that has been previously moved based on the positional relationship between the first lens unit and the second lens unit stored in advance. The first control processing for moving the lens means and the position of the first lens means moved by the first control step are in focus. A computer program for causing a computer to execute a second control process for adjusting the focus by moving the second lens unit while obtaining an evaluation value related to contrast at the position of the second lens unit is recorded. It is characterized by.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of an imaging apparatus to which the present invention is applied.
In FIG. 1, reference numerals 101, 102, 103, 104, and 105 denote elements constituting an inner focus type lens system, which are respectively a fixed front lens group and a second lens group for zooming (zooming). A lens, a variator lens, a zoom lens), a diaphragm, a fixed third lens group, and a fourth lens group (focus lens) having both a competition function and a focusing function. The video light of the subject 100 that has passed through the lens system is imaged on the imaging surface of the imaging device 106 and converted into a video signal by photoelectric conversion. This video signal is processed by the camera signal processing unit 108 via the amplifier (or impedance converter) 107, and then the video signal is amplified to a specified level by the amplifier 109, further processed by the display processing unit 110, and then processed by the LCD 111. Display the captured image.
[0021]
On the other hand, the video signal amplified by the amplifier 107 is sent to the aperture controller 112 and the AF evaluation value processor 115. The diaphragm control unit 112 controls the diaphragm 103 by driving the IG driver 113 and the IG meter 114 in accordance with the video signal input level to adjust the light amount. The AF evaluation value processing unit 115 extracts and processes only the high-frequency component of the video signal in the distance measurement frame in accordance with the gate signal from the distance measurement frame generation unit 117.
[0022]
The AF microcomputer 116 performs lens drive control and distance measurement frame control for changing the distance measurement area in accordance with the AF evaluation signal intensity. The AF microcomputer 116 communicates with a system control microcomputer 122 (hereinafter referred to as “syscon”), and the zoom switch 123 (unitized zoom SW that is read by the syscon 122 by A / D conversion or the like, and the rotation angle of the operation member) (Variable-speed zoom is performed according to the output voltage), and zooming operation information such as zoom direction and focal length during zooming controlled by the AF microcomputer 116, and the like. ing.
[0023]
The ROM 124 stores a program for processing to be described later executed by the syscon 122 and the AF microcomputer 116. In addition to the ROM, other semiconductor memories, optical disks, magneto-optical disks, magnetic media and other recording media may be used.
[0024]
Reference numerals 118 and 120 denote drivers for outputting driving energy to the respective lens driving motors in accordance with driving instructions for the lenses 102 and 105 output from the AF microcomputer 116, and reference numerals 119 and 121 denote driving means for driving the lenses 102 and 105, respectively. It is a motor.
[0025]
Next, assuming that the lens driving motors 119 and 121 are stepping motors, the driving method of each motor will be described.
The AF microcomputer 116 determines the driving speeds of the zoom motor 119 and the focus motor 121 by program processing, and sends them to the driver 118 for driving the zoom motor 119 and the driver 120 for driving the focus motor 121 as the rotation frequency signal of each stepping motor. . In addition, a drive / stop command for the motors 119 and 121 and a rotation direction command for each motor are sent to the drivers 118 and 120. The drive / stop signal and the rotation direction signal correspond mainly to the state of the zoom switch unit 123 with respect to the zoom motor 119, and according to the drive command determined by the processing in the microcomputer 116 during AF and zoom with respect to the focus motor 121. ing.
[0026]
Each driver 118, 120 sets the phase of the four motor excitation phases to the forward rotation and reverse rotation phases according to the rotation direction signal, and the applied voltages of the four motor excitation phases according to the received rotation frequency signal. By outputting while changing (or current), the output to each motor is turned ON / OFF according to the drive / stop command while controlling the rotation direction and rotation frequency of each motor. Further, since the rotation angle with respect to the number of stepping pulses is constant using a stepping motor, the position of each of zoom and focus is detected using the stepping pulse as it is as an incremental encoder.
[0027]
Next, a first embodiment of the present invention based on the above configuration will be described.
FIG. 2 is an operation flow in the microcomputer 116 when performing the focus adjustment which is a feature of the present embodiment. A program for executing each process of this flowchart is recorded in the ROM 124.
The process starts in step S501. First, in S502, the position of the variator lens 102 on the optical axis is set to a zoom position (1 in FIG. 3) corresponding to the vicinity of the top of the mountain where the locus of the focus lens 105 is a mountain shape. In step S503, the focus lens 105 is moved by the focus motor 121 to perform focusing. Here, the subject distance is set to the adjustment distance, and a subject such as a chart for some adjustment is arranged.
[0028]
Next, in S504, it is checked whether or not focus has been achieved, and the focus lens 105 is moved until focus is achieved. Actually, by searching the correlation between the focus voltage signal related to the contrast of the object and the moving direction of the focus lens 105, the focus position is searched while determining the moving direction in focus. Details are omitted in the flow.
[0029]
If it is confirmed in step S504 that the subject is in focus, the focus lens 105 is lowered by A based on the design value in step S505. The expression “lower” here indicates that it is taken in the direction of (2) in the figure in comparison with FIG. 3, and in reality, it may be extended to the subject side depending on the zoom type of the zoom lens. However, there are cases where the image is moved toward the image plane side. Next, in S506, the variator lens is driven from this state toward the tele side T. At the same time, in S507, it is determined whether or not the subject is in focus. When the movement of the variator lens is completed and focus is achieved at that position, the variator position corresponds to the variator position at the tele end. In step S508, the zoom encoder position in that state is stored in Vt as a value that defines the tele end position.
[0030]
FIG. 4 shows the above state near the telephoto end. As described above, even if trying to find the in-focus position with the variator lens, if the amount of movement of one pulse is large at tmm, even if (1) in FIG. There is a possibility of focusing in between. At that time, on the focus lens side, (1) is lowered by A in FIG. 3 from the top of the locus. At this time, if the focus position of the variator lens is (2) or (3), the focus lens position at the focal point is Are also [2] and [3]. Therefore, after finding the in-focus point with the variator lens, the focus lens is moved in S509, the focus is finely adjusted with the focus lens, and it is confirmed in S510 whether the in-focus point is in focus. In step S511, the current focus encoder output is stored in Rt.
[0031]
In step S512, the focus lens is moved in the optical axis direction by a balance corresponding to the difference in focus position of the focus lens at the adjustment distance between the tele end and the wide end. However, it is not necessary to move when this balance is zero as shown in FIG.
Further, by moving the variator lens in the same manner as determining the telephoto end in S513 and 514, the wide-side reference variator position is determined. Next, in S515, the position of the zoom encoder at this variator position is stored in Vw as the variator position of the focus reference value, and the focus position here becomes the reference position Rw of the focus lens. This focus reference value is a value stored in advance as a design value.
[0032]
As described above, the zoom tele end and wide end positions, the focus tele end reference position, and the wide end reference position are determined.
The tele end and wide end variator lens positions determined as described above, and the focus lens positions of the tele end and wide end reference positions are preferably stored in a writable ROM.
[0033]
As described above, according to the present embodiment, even if the movement amount of one pulse of the variator lens is increased in order to increase the zoom speed, the focus position at the tele end is not a design value. By setting the focus position and storing the focus position, a lens control device with less blur during zooming can be realized even in a rear focus type zoom lens.
[0034]
Next, a second embodiment will be described.
In the first embodiment, a method has been described in which the telephoto end and wide end variator values of the zoom lens, the tele end reference value of the focus, the wide end reference position, and the like are determined to determine the focal point of the adjustment subject. The adjustment subject distance is one. Therefore, in the present embodiment, a method for obtaining the focal point of another subject distance from the focus adjustment of the first embodiment will be described.
[0035]
In FIG. 5, the in-focus position at the tele end when the adjustment subject distance is infinite is B (50, 0 ′) (Rt in S511 in FIG. 2). For example, when the in-focus position at the tele end with a subject distance of 3 m is obtained using this in-focus point, the relationship between the focal length and the in-focus position is stored in the AF microcomputer 116 in FIG. 1 according to the subject distance. The design value trajectory with infinite subject distance is line segment A (49,0) -A (50,0), and the infinite cam trajectory of the actual lens is line segment A (49,0). -B (50,0 ')
(A (49,0) -A (50,0)) / (z50-z49)
→ (A (49,0) -B (50,0 ')) / (z50-z49)
It has changed to. This is also true for other subject distances.
[0036]
Therefore, for example, in order to obtain the actual lens inclination of the subject distance 3 m, from FIG.
(A (49,1) -B (50,1 ')) / (z50-z49)
≒ {(A (49,1) -A (50,1)) / (A (49,0) -A (50,0))} * {(A (49,0) -B (50,0 ' )) / (Z50-z49)}
It becomes.
[0037]
If the tilt is obtained, the in-focus position at the tele end T with a subject distance of 3 m can be obtained, and if the in-focus position at the tele end is stored only for the adjustment subject distance, The distance can be obtained by calculation even if the design value and the actual lens locus are deviated.
[0038]
As described above, according to the present embodiment, in the focus adjustment, the positions of the tele end and wide end variator lenses and the focus lens position of the tele end reference position are determined, and subject distances other than during focus adjustment are calculated by the above calculation. By calculating the focal point of the lens, even if the amount of movement of one pulse of the variator lens is increased to increase the speed of zooming, the rear focus type zoom lens can control the lens without blur on the telephoto side during zooming. A device can be realized.
[0039]
【The invention's effect】
As described above, according to the present invention, even if the amount of movement of the variator lens is increased in order to increase the zoom speed and the amount of blur increases, adjustment without blur can be performed during zooming.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an imaging apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart showing an operation of focus adjustment.
FIG. 3 is a characteristic diagram for explaining tele-middle tracking adjustment.
FIG. 4 is a characteristic diagram showing a positional relationship between a focus lens and a variator lens.
FIG. 5 is a characteristic diagram illustrating a state near a telephoto end in focus adjustment.
FIG. 6 is a configuration diagram showing a conventional inner focus type lens system.
FIG. 7 is a characteristic diagram illustrating a relationship between a focal length and a focus position with respect to each subject distance.
[Explanation of symbols]
102 Variable magnification lens (variator lens, zoom lens)
105 Focus lens
115 AF evaluation value processing unit
116 AF microcomputer
118 Variable lens motor
121 Focus lens motor
122 System control microcomputer
124 ROM

Claims (10)

At least either the tele end or the wide end of the first lens means for performing the zooming operation and the second lens means for correcting the movement of the focal plane when the first lens means is moved A lens control device having a positional relationship adjustment function on one side,
First control means for controlling movement of the first lens means;
A second control unit that controls the movement of the second lens unit that corrects the movement of the focal plane during the movement of the first lens unit based on a positional relationship with the position of the first lens unit stored in advance; Control means,
Adjusting means for adjusting the positional relationship,
The adjusting means is a position of the second lens means previously moved by the second control means based on the positional relationship between the first lens means and the second lens means stored in advance. The first control means moves the first lens means so as to be in focus, and the second control means causes the first lens means to focus at the position of the moved first lens means. A lens control apparatus, wherein the positional relationship is adjusted based on in-focus position information of the second lens means obtained by moving the second lens means.   2. The in-focus position information of the second lens unit is information acquired based on an evaluation value related to contrast obtained while moving the second lens unit. The lens control device described. At least either the tele end or the wide end of the first lens means for performing the zooming operation and the second lens means for correcting the movement of the focal plane when the first lens means is moved A lens control device having a positional relationship adjustment function on one side,
First control means for controlling movement of the first lens means;
The second correction for correcting the movement of the focal plane during the movement of the first lens means based on the previously stored positional relationship between the position of the first lens means and the position of the second lens means. Second control means for controlling the movement of the lens means,
The first control means performs focusing at the position of the second lens means that has been moved first based on the positional relationship between the first lens means and the second lens means stored in advance. Moving the first lens means so that
The second control means obtains an evaluation value related to contrast at a position of the second lens means that is in focus at the position of the first lens means moved by the first control means. The lens control apparatus is characterized in that the focal point is adjusted by moving the second lens means. Storage means for storing in advance a positional relationship between the position of the first lens means and the position of the second lens means in accordance with the subject distance;
Based on the in-focus position information obtained by the movement of the first lens means and the second lens means, the position of the first lens means and the position of the second lens means stored in the storage means The lens control device according to claim 3, further comprising an adjusting unit that adjusts a positional relationship between the lens control device and the lens control device.   Information storing the positional relationship between the position of the first lens means and the position of the second lens means in accordance with the subject distance, and the first moved by the first control means at a predetermined subject distance. Based on the in-focus position information of the second lens means corresponding to the position of the lens means, the positional relationship between the first lens means and the second lens means corresponding to each subject distance is output. The lens control apparatus according to claim 1, further comprising an output unit configured to perform output.   The position of the second lens means moved earlier is the first lens at an intermediate point of the positional relationship between the first lens means and the second lens means stored in advance. An in-focus position of the second lens means when the means is present is detected, and the second lens means is moved from the in-focus position by a preset amount. Item 6. The lens control device according to any one of Items 1 to 5.   At least the position of the first lens means for performing the zooming operation stored in advance and the position of the second lens means for correcting the movement of the focal plane when the first lens means is moved A lens control method for adjusting the positional relationship at either the tele end or the wide end, wherein the lens control method is based on the previously stored positional relationship between the first lens unit and the second lens unit. The first lens means is moved by the first control means so as to be focused at the position of the second lens means previously moved by the second control means, and the moved first first means is moved. Based on in-focus position information of the second lens means obtained by moving the second lens means by the second control means so as to be in focus at the position of the lens means, the information is stored in advance. The first len Lens control method characterized by adjusting the positional relationship between means and the position of the second lens unit. At least the position of the first lens means for performing the zooming operation stored in advance and the position of the second lens means for correcting the movement of the focal plane when the first lens means is moved A lens control method for adjusting the positional relationship at either the tele end or the wide end, based on the previously stored positional relationship between the first lens unit and the second lens unit. A first control for moving the first lens means so as to be in focus at the position of the second lens means moved to
While obtaining the evaluation value related to the contrast at the position of the second lens means that is in focus at the position of the first lens means moved by the first control step, the second lens means And a second control for moving and adjusting a focal point.   At least the position of the first lens means for performing the zooming operation stored in advance and the position of the second lens means for correcting the movement of the focal plane when the first lens means is moved A computer-readable recording medium recorded with a computer program for adjusting the positional relationship at either the tele end or the wide end, wherein the first lens means stored in advance and the computer Based on the positional relationship with the second lens means, the first control means causes the first control means to focus at the position of the second lens means previously moved by the second control means. The first lens unit obtained by moving the lens unit and moving the second lens unit by the second control unit so as to be focused at the position of the moved first lens unit. A computer program for causing a computer to execute a process for adjusting the positional relationship between the first lens means and the second lens means stored in advance is recorded based on in-focus position information of the lens means. A computer-readable recording medium characterized by that. At least a telephoto position between the position of the first lens means for performing the zooming operation stored in advance and the position of the second lens means for correcting the movement of the focal plane during the movement of the first lens means. A computer-readable recording medium having recorded thereon a computer program for adjusting the positional relationship at either the wide end or the wide end, wherein the first lens means stored in advance and the first lens means A first control process for moving the first lens means so as to be focused at the position of the second lens means that has been moved first based on the positional relationship with the second lens means;
While obtaining the evaluation value related to the contrast at the position of the second lens means that is in focus at the position of the first lens means moved by the first control step, the second lens means A computer-readable recording medium having recorded thereon a computer program for causing a computer to execute a second control process for moving and adjusting a focus.

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