JP4350175B2 - Lens control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic focus adjustment technique in an imaging apparatus such as a video camera, a silver salt camera, or an electronic still camera.
[0002]
[Prior art]
In the case of a rear focus zoom lens, the positional relationship on the optical axis at the time of focusing between the variator that changes the angle of view and the focus lens that adjusts the focus is the change in the focal plane position when the focus lens changes magnification. 6 is provided for each subject distance as shown in FIG. 6 (hereinafter, the line shown in FIG. 6 is referred to as “cam locus”). Therefore, in FIG. 6, for example, when the subject distance is infinite, when the variator moves on the optical axis from the wide, the focus lens has a sign of ∞ that is a convex locus on the object side (closest side) on the optical axis. Control is performed so as to move along the locus indicated by.
[0003]
Thus, conventionally, when performing wide-to-tele or tele-to-wide zooming, the variator and focus lens are driven and controlled so as to trace the cam trajectory according to the subject distance. I was trying to get
[0004]
However, as shown in FIG. 6, the cam trajectory for each subject distance becomes denser as it approaches the wide position, so when zooming from wide to tele, the cam trajectory corresponding to the subject distance is accurately selected. In some cases, the cam trajectory selected first is slightly shifted from the cam trajectory corresponding to the subject distance.
[0005]
In such a case, blurring occurs due to zooming. For example, when tele-zooming from a wide position, as shown in FIG. 7, when a 1 m cam trajectory is first selected and traced for a subject having a subject distance of 2 m, blurring occurs near the wide end. It does not occur, but blur occurs from middle to tele. In addition, the subject distance may change due to the movement of the subject, and the cam locus that has been traced may be out of focus, resulting in blurring. A similar problem occurs when the subject moves during zooming.
[0006]
In order to deal with such a case, first, a signal for automatic focusing (hereinafter referred to as an AF signal) is extracted from a video signal obtained from a photoelectric conversion element such as a CCD during zooming to determine the degree of focusing. As a result, when the blur was recognized, the focus cam trajectory that does not cause blur was selected and changed to the focus cam trajectory (however, the cam trajectory was not changed and the first calculation was performed. In some cases, the amount of movement of the focus lens to follow the calculated cam trajectory is simply corrected). As described above, when the amount of movement of the focus lens is corrected with the occurrence of blur during zooming, the zoom speed is not considered in consideration of the degree of blur (degree of focus).
[0007]
[Problems to be solved by the invention]
By the way, as the image quality and magnification become higher, the addition of a function for expanding the shooting range is required. In particular, there is a great demand for an ultra-low speed zoom that expands the shooting range, so-called “picture re-zoom”, and an ultra-high speed zoom for changing the angle of view from tele to wide or wide to telehe as fast as possible.
[0008]
However, when the zoom speed is variable in a wide range from an ultra-high speed to an ultra-low speed, if the focus lens movement amount is corrected in consideration of only the in-focus level without considering the zoom speed as in the prior art, FIG. As described above, if the in-focus degree is the same, the movement amount of the focus lens is the same regardless of the zoom speed, and the following problem has occurred. For example, at the time of ultra-high speed zoom, the amount of movement of the focus lens becomes too large, so that it may pass through the focus cam locus that should be changed, and the blur may be conspicuous. On the other hand, during the ultra-low speed zoom, the time required to reach the in-focus cam locus is long.
[0009]
The present invention has been made under such a background, and the problem is that it is possible to correct the focus movement amount accompanying the occurrence of blurring during zooming with high accuracy and speed, regardless of the zoom speed. There is in doing so.
[0010]
[Means for Solving the Problems]
  In order to solve the above-described problem, a lens control device according to the present invention includes a variable power lens, a focus lens having a function of correcting a change in focal plane position accompanying the movement of the variable power lens, and a subject distance. Storage means for storing a locus indicating the positional relationship between the zoom lens and the focus lens at the time of focusing, detection means for detecting the degree of focus, position information on the zoom lens and the focus lens Selection means for selecting the trajectory based on the trajectory selected by the selection means, and the degree of focus detected by the detection meansAnd the moving speed of the zoom lensAnd a control means for calculating a movement amount of the focus lens for moving the focus lens according to the locus and changing a movement amount of the focus lens according to a moving speed of the zoom lens. The control means reduces the amount of movement of the focus compensator as the moving speed of the variable power lens increases when the focus lens is changed according to the moving speed of the variable power lens. It is characterized by controlling as follows.
[0011]
  Further, the lens control device according to the present invention includes a zoom lens, a focus lens having a function of correcting a change in focal plane position accompanying the movement of the zoom lens, and the focus control lens according to the subject distance. A storage means storing a locus indicating the positional relationship between the variable power lens and the focus lens, a detecting means for detecting a degree of focus, and the locus based on position information of the variable power lens and the focus lens. Selection means for selecting; locus selected by the selection means; and degree of focus detected by the detection meansAnd the moving speed of the zoom lensAnd a control means for calculating a movement amount of the focus lens for moving the focus lens according to the locus and changing a movement amount of the focus lens according to a moving speed of the zoom lens. The control means increases the amount of movement of the focus lens when the degree of focus detected by the detecting means is low, and increases the movement speed of the zoom lens when the moving speed of the zoom lens is high. Control is made to reduce the amount of movement.
[0012]
  In addition, the lens control device according to the present invention includes a variable power lens, a focus lens that corrects a change in a focal plane position due to the movement of the variable power lens, and the variable power lens at the time of focusing according to a subject distance. Storage means storing a locus indicating the positional relationship with the focus lens, detection means for detecting a focus degree, position information of the zoom lens and the focus lens, and a focus degree detected by the detection means And selecting the locus according to the moving speed of the zoom lens,ThereforeThe focus lensMoveControl means for controlling the amount of movement to be performed, the control means changes the amount of movement of the focus lens according to the movement speed of the zoom lens, the faster the movement speed of the zoom lens, Control is performed to reduce the amount of movement of the focus lens.
  In addition, the lens control device according to the present invention includes a variable power lens, a focus lens that corrects a change in a focal plane position due to the movement of the variable power lens, and the variable power lens at the time of focusing according to a subject distance. Storage means storing a locus indicating the positional relationship with the focus lens, detection means for detecting a focus degree, position information of the zoom lens and the focus lens, and a focus degree detected by the detection means And selecting the locus according to the moving speed of the zoom lens,ThereforeThe focus lensMoveControl means for controlling the amount of movement for causing the movement of the focus lens, the lower the degree of focus detected by the detection means, the larger the amount of movement of the focus lens, and the speed of movement of the zoom lens. Control is performed such that the amount of movement of the focus lens decreases as the speed increases.
[0013]
  The present invention also provides a variable power lens, a focus lens having a function of correcting a change in a focal plane position caused by the movement of the variable power lens, the variable power lens at the time of focusing according to a subject distance, and the focus. Storage means storing a locus indicating a positional relationship with the lens, detection means for detecting a degree of focus, selection means for selecting the locus based on position information of the zoom lens and the focus lens, and the selection Based on the trajectory information selected by the means and the degree of focus detected by the detecting means, the amount of movement of the focus lens for moving the focus lens according to the trajectory is calculated, and the zoom lens Control means for changing the amount of movement of the focus lens in accordance with the moving speed.The control means changes the moving amount of the focus lens according to the moving speed of the variable power lens, and decreases the moving amount of the focus lens as the moving speed of the variable power lens increases. Configured to control.
The present invention also provides a variable power lens, a focus lens having a function of correcting a change in a focal plane position caused by the movement of the variable power lens, the variable power lens at the time of focusing according to a subject distance, and the focus. Storage means storing a locus indicating a positional relationship with the lens, detection means for detecting a degree of focus, selection means for selecting the locus based on position information of the zoom lens and the focus lens, and the selection Based on the trajectory information selected by the means and the degree of focus detected by the detecting means, the amount of movement of the focus lens for moving the focus lens according to the trajectory is calculated, and the zoom lens Control means for changing the amount of movement of the focus lens in accordance with the movement speed, and the control means is the focus detected by the detection means. The lower, the larger the amount of movement of the focus compensation lens, the higher the moving speed of the variator lens is fast, and is configured to control so as to reduce the movement amount of the focus compensation lens.
The present invention also includes a variable power lens, a focus lens that corrects a change in a focal plane position caused by the movement of the variable power lens, and the variable power lens and the focus lens at the time of focusing according to a subject distance. Storage means storing a locus indicating a positional relationship, detection means for detecting a focus degree, position information of the zoom lens and the focus lens, focus degree detected by the detection means, and zooming Control means for selecting the trajectory according to the moving speed of the lens and controlling a moving amount for causing the focus lens to follow the trajectory, the control means depending on the moving speed of the zoom lens. The amount of movement of the focus lens is changed, and the amount of movement of the focus lens is controlled to decrease as the moving speed of the zoom lens increases. The
[0014]
  The present invention also includes a variable power lens, a focus lens that corrects a change in focal plane position accompanying the movement of the variable power lens, and the variable power lens and the focus lens at the time of focusing according to a subject distance. Storage means storing a locus indicating a positional relationship, detection means for detecting a focus degree, position information of the zoom lens and the focus lens, focus degree detected by the detection means, and zooming Control means for selecting the locus according to the moving speed of the lens and controlling a movement amount for causing the focus lens to follow the locus.The control unit increases the movement amount of the focus lens as the degree of focus detected by the detection unit is lower, and decreases the movement amount of the focus lens as the movement speed of the zoom lens increases. Is configured to control.
[0016]
In the present invention, the control means / process / routine selects a new locus from the locus selected by the selection means / process / routine by arithmetic processing.
[0018]
In the present invention, the control means, the process, and the routine are new in such a way that the moving amount of the focus lens group changes stepwise according to the degree of focus and the moving speed of the zoom lens unit. The locus is selected.
[0019]
In the present invention, the control means, the process, and the routine are new in such a form that the moving amount of the focus lens group continuously changes in accordance with the degree of focus and the moving speed of the zoom lens unit. The locus is selected.
[0020]
In the present invention, the lens system is constituted by an interchangeable lens system, and the detection means / process / routine and the control means / process / routine are mounted on the interchangeable lens system.
[0021]
In the present invention, the lens system is constituted by a replaceable lens system, and the detection means / process / routine and the control means / process / routine are mounted on the imaging apparatus main body.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0025]
[First Embodiment]
FIG. 1 is a block diagram showing a schematic configuration of an imaging apparatus according to the first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an optical system, which includes a four-group rear focus zoom lens (hereinafter referred to as an RFZ lens) including four lens groups. That is, the RFZ lens 1 includes a first lens group (hereinafter referred to as a front lens) 101 that is a fixed lens group, a second lens (hereinafter referred to as a variator) 102 that is a moving lens group and has a variable power function, and a fixed lens group. A third lens group (hereinafter referred to as afocal) 103 which is a lens group, a moving lens group which is a focus function, and a function as a compensator which corrects a change in the image plane position due to a zooming operation. 4 lens groups (hereinafter referred to as focus lens).
[0026]
2 is a photoelectric conversion element such as a CCD, 3 is a diaphragm for adjusting the amount of light incident on the photoelectric conversion element 2, 4 is a diaphragm drive unit for changing the aperture of the diaphragm 3, and 5 is a position of the diaphragm 3. An aperture position detector 6 for detecting the aperture (aperture amount) of the aperture 3 based on an output signal of the aperture position detector 5, and a controller 7 for comprehensively controlling the imaging operation of the imaging apparatus. It is.
[0027]
The control unit 7 includes a microcomputer, and includes a CPU, a ROM, and a RAM (not shown). The ROM stores a cam locus shown in FIG. 6, a control program corresponding to the flowchart shown in FIG. Then, the CPU controls various processes such as the AF process while using the RAM as a work area or the like according to a control program stored in the ROM. Reference numerals 8 and 9 denote motors such as stepping motors for moving the variator 102 and the focus competition lens 104, respectively. These motors 8 and 9 are driven by motor drivers 10 and 11, respectively. Reference numeral 12 denotes an amplifier that amplifies the output signal of the photoelectric conversion element 2, and reference numeral 13 denotes a process circuit that converts the amplified signal into an NTSC video signal or the like.
[0028]
Reference numeral 14 denotes an AF control unit which generates a signal for performing automatic focusing (hereinafter referred to as AF) from an output signal of the process circuit 13 and performs an AF operation, and 15 is a zoom operation unit. The AF control unit 14 uses the high-frequency component of the video signal, the edge shape, etc. as the focus information of the subject, determines the focus level based on the focus information, and if the blur is recognized, the blur recognition level is set. This is notified to a cam trajectory selection unit 16 described later. As the AF method, a hill-climbing method or the like has been proposed, but its basic principle is well known by, for example, Japanese Patent Laid-Open No. Sho 62-103616, and a detailed description thereof is omitted here. The zoom operation unit 15 outputs a tele or wide zoom direction and a zoom speed signal. The zoom speed may be a plurality of arbitrary speeds or a fixed speed.
[0029]
Reference numeral 16 denotes a cam trajectory selection unit that selects an optimal cam trajectory for eliminating blurring that occurs during zooming. The cam trajectory selection unit 16 is configured to detect the zoom speed and the blur that is notified from the AF control unit 14. The cam locus is selected based on the recognition degree (focusing degree). The selection of the cam locus is actually performed by determining the drive amount of the focus lens 104 (hereinafter referred to as the focus drive amount).
[0030]
When the cam trajectory selection unit 16 selects a cam trajectory based on the zoom speed and the degree of blur recognition, as shown in FIG. 2, when the zoom speed is slow and the blur is large, the focus drive amount is increased and the zoom is selected. When the speed is fast and the blur is small, the focus drive amount is reduced. That is, the focus drive amount is determined so as to be inversely proportional to the in-focus level and the zoom speed.
[0031]
In the present embodiment, in practice, the optimum cam locus, that is, the focus drive amount for eliminating the blur is obtained based on the following equation.
[0032]
AFP = AFD × FK (1)
However, AFP is a focus driving amount based on the degree of blur recognition, FK is a calculation coefficient obtained from the zoom speed and the degree of blur recognition, and AFD is a focus driving amount per unit at the time of blur recognition.
[0033]
The focus drive amount ADF per unit takes into account the focal length, aperture, focus position, etc., and is obtained by calculation according to the focal length, aperture, focus position, etc., and the focal length, aperture, focus position, etc. Different values will have different values. However, the focus drive amount ADF corresponding to the focal length, the aperture, the focus position, etc. may be stored in a table format and read as necessary.
[0034]
Further, as shown in FIG. 3, the calculation coefficient FK regulates the focus driving amount so as to be proportional to the size of blur (that is, inversely proportional to the degree of focus) and inversely proportional to the zoom speed. The calculation coefficient FK can be obtained by a predetermined calculation formula based on the zoom speed and the degree of blur recognition, or the movement distance of the focus lens group 104 corresponding to the degree of blur recognition and the zoom speed can be stored in advance in a table format. If necessary, the one corresponding to the zoom speed and the degree of blur recognition may be read out. When the calculation coefficient FK is stored, it can be arbitrarily changed by storing it in a rewritable storage means.
[0035]
Further, the calculation coefficient FK may be one that changes the focus driving amount step by step as shown in FIG. 2, or one that changes continuously as shown in FIG. Further, in the case of the calculation coefficient FK that is changed stepwise, a coefficient that changes the focus drive amount more finely than in FIG. 2 may be used.
[0036]
Next, the focusing control operation during zooming will be described with reference to the flowchart of FIG. Note that the processing of FIG. 4 is repeatedly executed during the zooming operation.
[0037]
First, based on the zoom drive command from the zoom operation unit 15, it is determined whether or not the zoom operation mode is set (step S11). On the other hand, in the zoom operation mode, the zoom speed signal from the zoom operation unit 15 is read (step S12). Based on the zoom speed and the positions of the variator 102 and the focus compensator 104, the cam trajectory is calculated, and the focus drive amount corresponding to the calculated cam trajectory is calculated (step S13). This cam trajectory is calculated only as a representative cam trajectory as shown in FIG. 6, and a missing cam trajectory is obtained by calculation, and is focused with high accuracy with a small amount of information. It is done to make it happen.
[0038]
Next, it is determined whether or not the AF mode is set by an AF switch (not shown) (step S14). As a result, if the AF mode is not set, the focus lens 104 is driven by the focus drive amount calculated in step S13 (step S20), and the process ends. On the other hand, if the AF mode is set, the AF control unit 14 performs a degree-of-focus determination process for blur recognition (step S15), and determines whether the blur is recognized (step S16). As a result, when the blur is not recognized, the focus lens 104 is driven by the focus drive amount calculated in step S13 (step S20), and the process ends.
[0039]
On the other hand, when the blur is recognized, the calculation coefficient FK corresponding to the degree of blur (focus degree) and the zoom speed is calculated (step S17). Then, the focus drive amount corresponding to the degree of blur (degree of focus) and the zoom speed is calculated by the above formula (1) using the calculated calculation coefficient FK (step S18). Next, the focus drive amount corresponding to the cam trajectory calculated in step S13 and the focus drive amount corresponding to the degree of blur (focus degree) and the zoom speed calculated in step S18 are added (step S19). . Then, the focus lens 104 is driven by the added focus drive amount (step S20), and the process ends.
[0040]
In this way, by driving the focus lens 104 by the added focus drive amount, the cam locus selected in step S13 is separated by the focus drive amount calculated in step S18. The position is changed to the cam locus of the position (however, there is a case where the change of the locus is not performed and the focus driving amount calculated first is simply corrected). At that time, if the zoom speed is slow and the blur is large (when the degree of focus is low), the cam trajectory is switched to a position away from the currently selected cam trajectory, and the zoom speed is fast and the blur is small ( If the degree of focus is high), a change is made to a cam locus at a position near the currently selected cam locus.
[0041]
Therefore, when changing the cam trajectory, at the time of ultra-high speed zoom, the focus cam trajectory that should be changed over is passed, and conversely, the blur does not become noticeable, and at the time of ultra-low speed zoom, It is possible to quickly reach the focusing cam locus. In other words, the correction of the focus movement amount due to the occurrence of blur during zooming can be performed with high accuracy and speed, regardless of the zoom speed.
[0042]
[Second Embodiment]
FIG. 5 is a block diagram illustrating a schematic configuration of an imaging apparatus according to the second embodiment.
[0043]
The imaging apparatus according to the second embodiment is an interchangeable lens type imaging apparatus, and the camera unit control unit 18 of the camera unit 40 includes an AF control signal in the television signal generated by the process circuit 13 and an aperture. An operation signal, an operation signal from the zoom operation unit 15, and the like are transmitted to the lens unit control unit 17 of the lens unit 30 via the camera contact 19 and the lens contact 20. The lens unit control unit 17 performs AF control and aperture control based on the signal transmitted from the camera unit control unit 18 and transmits the zoom position, focus position, aperture position, and the like to the camera unit control unit 18.
[0044]
The lens unit control unit 17 includes an AF control unit 14 and a cam locus selection unit 16 like the control unit 7 of the first embodiment, and recognizes blurring during zooming as in the first embodiment. In such a case, the cam locus changing process is performed in consideration of the degree of blur and the zoom speed. Therefore, the same effect as that of the first embodiment can be obtained. The AF control unit 14 and the cam trajectory selection unit 16 can be mounted on the camera unit 40 to reduce the price of the lens unit 30.
[0045]
Note that the present invention is not limited to the above-described embodiment, and the focus movement amount can be corrected based only on the zoom speed, for example.
[0046]
In addition, the locus is selected based on the positional information of the zoom lens and the focus lens, the amount of movement of the focus lens for tracking the selected locus is calculated based on the degree of focus, and the moving speed of the zoom lens It is also possible to change the amount of movement of the focus lens according to the calculation according to the above.
[0047]
It is also possible to select the locus according to the position information of the zoom lens and focus lens, the degree of focus, and the moving speed of the zoom lens, and to control the amount of movement of the focus lens to follow this locus. It is. In these cases, it goes without saying that the amount of movement of the focus lens is increased as the degree of focus is lower, and the amount of movement of the focus lens is decreased as the moving speed of the zoom lens is increased.
[0048]
【The invention's effect】
  As described above, according to the present invention, the zoom lens, the focus lens having a function of correcting the change of the focal plane position accompanying the movement of the zoom lens, and the focusing lens according to the subject distance can be obtained. A storage unit that stores a locus indicating a positional relationship between the zoom lens and the focus lens, a detection unit that detects a degree of focus, and the locus based on positional information of the zoom lens and the focus lens. Selection means for selecting the locus, the trajectory selected by the selection means, and the degree of focus detected by the detection meansAnd the moving speed of the zoom lensAnd a control means for calculating a movement amount of the focus lens for moving the focus lens according to the locus and changing a movement amount of the focus lens according to a moving speed of the zoom lens. The control means reduces the amount of movement of the focus compensator as the moving speed of the variable power lens increases when the focus lens is changed according to the moving speed of the variable power lens. Thus, the focus movement amount associated with the occurrence of blur during zooming can be corrected with high accuracy and speed, regardless of the zoom speed.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of an imaging apparatus according to a first embodiment of the present invention.
FIG. 2 is a diagram illustrating an example in which a focus movement amount for changing a cam locus changes stepwise according to the degree of blur and the zoom speed.
FIG. 3 is a diagram illustrating an example in which a focus movement amount for changing a cam locus continuously changes in accordance with the degree of blur and the zoom speed.
FIG. 4 is a flowchart showing a focusing operation during zooming.
FIG. 5 is a block diagram illustrating a schematic configuration of an imaging apparatus according to a second embodiment of the present invention.
FIG. 6 is a diagram showing a cam trajectory.
FIG. 7 is a diagram for explaining a change factor of a cam locus.
FIG. 8 is a diagram illustrating an example of a cam locus change process based on blur recognition during a conventional zoom.
[Explanation of symbols]
1: rear focus zoom lens, 2: CCD, 7: control unit, 8, 9: motor, 10, 11: motor driver, 13: process circuit, 14: AF control unit, 15: zoom operation unit, 16: cam locus Selection unit, 17: lens unit control unit, 18: camera unit control unit, 30: lens unit, 40: camera unit, 102: variator, 104: focus lens.

Claims (4)

A variable power lens,
A focus lens having a function of correcting a change in focal plane position accompanying the movement of the zoom lens;
Storage means for storing a locus indicating a positional relationship between the zoom lens and the focus lens when focusing according to a subject distance;
Detection means for detecting the degree of focus;
Selection means for selecting the trajectory based on positional information of the zoom lens and the focus lens;
The movement of the focus compensator for moving the focus compensator according to the trajectory based on the trajectory selected by the selecting means, the degree of focus detected by the detecting means, and the moving speed of the zoom lens. Control means for calculating the amount and changing the amount of movement of the focus lens according to the moving speed of the zoom lens;
The control means performs control so that the moving amount of the focus lens is reduced as the moving speed of the zoom lens increases, when the focus lens is changed according to the moving speed of the zoom lens. A lens control device. A variable power lens,
A focus lens having a function of correcting a change in focal plane position accompanying the movement of the zoom lens;
Storage means for storing a locus indicating a positional relationship between the zoom lens and the focus lens when focusing according to a subject distance;
Detection means for detecting the degree of focus;
Selection means for selecting the trajectory based on positional information of the zoom lens and the focus lens;
The movement of the focus compensator for moving the focus compensator according to the trajectory based on the trajectory selected by the selecting means, the degree of focus detected by the detecting means, and the moving speed of the zoom lens. Control means for calculating the amount and changing the amount of movement of the focus lens according to the moving speed of the zoom lens;
The control means increases the amount of movement of the focus lens when the degree of focus detected by the detecting means is low, and decreases the amount of movement of the focus lens when the moving speed of the zoom lens is high. A lens control device that performs control so as to perform. A variable power lens,
A focus lens that corrects a change in focal plane position accompanying the movement of the zoom lens;
Storage means for storing a locus indicating a positional relationship between the zoom lens and the focus lens at the time of focusing according to a subject distance;
Detection means for detecting the degree of focus;
And position information of the focus lens and the variable power lens, a focus level detected by said detecting means, thereby selecting the trajectory according to the moving speed of the zoom lens, the thus the focus lens to the locus and control means for controlling the movement amount for moving the,
The control means changes the moving amount of the focus lens in accordance with the moving speed of the zoom lens, and controls the moving amount of the focus lens to decrease as the moving speed of the zoom lens increases. A lens control device. A variable power lens,
A focus lens that corrects a change in focal plane position accompanying the movement of the zoom lens;
Storage means for storing a locus indicating a positional relationship between the zoom lens and the focus lens at the time of focusing according to a subject distance;
Detection means for detecting the degree of focus;
And position information of the focus lens and the variable power lens, a focus level detected by said detecting means, thereby selecting the trajectory according to the moving speed of the zoom lens, the thus the focus lens to the locus and control means for controlling the movement amount for moving the,
The control unit increases the movement amount of the focus lens as the degree of focus detected by the detection unit is lower, and decreases the movement amount of the focus lens as the movement speed of the zoom lens increases. The lens control device characterized by controlling to the above.

Images