JP3804841B2 - Camera lens drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera lens drive device, and more particularly to a camera lens drive device that moves a focus lens based on an operation of a manual operation member and a focus evaluation value.
[0002]
[Prior art]
In a conventional television camera or the like, a cameraman performs focus adjustment by moving a focus lens by a manual operation using a lens controller or the like called a focus demant while viewing a subject image in a viewfinder. However, if the focus is high with a long-focus lens, or if the viewfinder is small and it is difficult to check the focus for the resolution of the camera, it is difficult to perform focus adjustment that is always satisfactory with manual operation. was there.
[0003]
In view of this, Japanese Patent Laid-Open No. 8-36129 proposes the following focus adjustment method. According to this, when the cameraman manually operates the lens controller (focus demand) to adjust the focus, the focus evaluation values are sequentially detected from the captured images, and when the cameraman finishes the focus operation. The focus lens is automatically moved to the position where the detected focus evaluation value is maximized to perform focus correction (automatic focus correction). As a result, high-precision focus adjustment that cannot be adjusted by manual operation of the photographer can be performed.
[0004]
[Problems to be solved by the invention]
However, many lens controllers such as a focus demand detect the position of the operation member operated by the cameraman (the rotation angle of the focus ring) by a potentiometer, and on the camera side, the absolute position input from the lens controller is detected. The focus lens is moved to the corresponding position. Therefore, when the focus adjustment method described in JP-A-8-36129 is applied to such a camera, there are the following problems.
[0005]
For example, after the cameraman moves the focus lens to a desired position by the focus demand, when the camera automatically moves the focus lens to a position where the focus evaluation value is maximized, the focus demand operation member position (rotation angle) is reached. The focus lens moves to a position that does not correspond and stops. In this case, the next time the cameraman operates the operating member of the focus demand, the focus lens will immediately move to the position corresponding to the position of the operating member, so the focus lens does not move in the direction intended by the cameraman. Or the movement of the focus lens becomes unnatural.
[0006]
In order to solve this, it is conceivable to control the focus lens by the relative position from the stop position, such as moving the focus lens by an amount corresponding to the variation in the position of the operating member of the focus demand. However, in this case, the stop end of the focus lens (the infinity end and the close end) and the stop end of the potentiometer that detects the position of the operating member do not match, and the focus lens is not the stop end even though the potentiometer is not the stop end. Therefore, even if the operation member is operated, the focus lens does not move, or the potentiometer is at the stop end even though the focus lens has not reached the stop end. And the focus lens cannot be moved.
[0007]
Further, if the change in the position of the operating member of the focus demand is detected by, for example, an incremental type rotary encoder and the focus lens is controlled at the relative position as described above, the rotary encoder has no stop end. However, the focus demand currently used in TV cameras is the one that uses a potentiometer, that is, the one that controls the focus lens at the absolute position, and the rotary encoder that controls this at the relative position. This is not preferable in terms of compatibility, and there is a problem in that it is not preferable in terms of operability because it is difficult for the cameraman to recognize the stop end of the focus lens unless the operation member has a stop end.
[0008]
The present invention has been made in view of such circumstances, and in a camera that performs focus adjustment based on a manual operation of a photographer and automatic focus adjustment, a focus instruction position of a manual operation member generated by automatic focus adjustment, and It is an object of the present invention to provide a camera lens driving device that eliminates operational problems due to deviation from the actual focus position and moves a focus lens without a sense of incongruity with respect to manual operation by a cameraman.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a manual focusing means for controlling a motor to drive a focus lens based on an operation of a manual operation member, and an automatic for automatically controlling the motor to drive the focus lens. In the lens driving device of the camera that performs the second focusing by the automatic focusing unit after the first focusing by the manual focusing unit is completed, the manual focusing unit instructs A shift amount calculating means for calculating a shift amount between the position of the focus lens to be moved and the current position of the focus lens, and the focus lens so that the shift amount is gradually reduced when the manual focusing means is driven again. And a control means for driving the motor.
[0010]
According to the present invention, when the manual operation member is operated by the cameraman, the focus lens is moved by controlling the motor based on the operation of the operation member (first focusing), and the operation of the operation member is completed. Then, the focus lens is driven by the automatic focusing means to perform the second focusing. In this case, due to the movement of the focus lens by the automatic focusing means, a shift occurs between the position of the focus lens instructed by the manual focusing means and the current position of the focus lens. When operated, the focus lens is driven so that the deviation is gradually reduced. As a result, when the operating member is operated, the focus lens gradually approaches the position indicated by the operating member, so that it is possible to perform a focus operation that is comfortable for the photographer, and the stop end of the focus lens. It is possible to prevent a problem that the stop ends of the focus operation member do not match.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a lens driving device for a camera according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a block diagram showing an internal configuration of a television camera to which a lens driving device for a camera according to the present invention is applied. As shown in the figure, the photographing optical system 10 is composed of a focus lens 12, a variable magnification lens 14, a master lens 16, a diaphragm 18, and the like, and a subject image is passed through these lenses and the diaphragm 18 to the CCD 20 that is an image sensor. The image is formed on the image plane.
[0012]
The focus lens 12 of the photographing optical system 10 is moved by a motor 36, and its control is performed by a CPU 32. The CPU 32 obtains a target position (hereinafter referred to as a focus target position) for moving the focus lens 12 based on a focus ring 42 (to be described later) or a focus evaluation value obtained from an image signal. , The focus lens position) is detected by the potentiometer 40 and input via the A / D converter 38. Then, a difference between the focus lens position and the focus target position is detected, and a voltage signal corresponding to the difference is sequentially output to the motor drive circuit 34 via the D / A converter 33 as a focus control signal.
[0013]
The motor drive circuit 34 amplifies the voltage of the focus control signal, drives the motor 36 so that the difference between the focus lens position and the focus target position becomes 0, and moves the focus lens 12. Thereby, the focus lens 12 is moved to the focus target position.
The CPU 32 recognizes the focus lens position and the focus target position numerically, and a value P indicating the focus lens position (hereinafter referred to as a focus lens value P) is a voltage input from the potentiometer 40. The value Pa given by the voltage value of the signal and indicating the focus target position (hereinafter referred to as the focus target value Pa) is the sum of the focus lens value P when the focus lens position matches the focus target position. Is given as 0.
[0014]
Therefore, when the focus target position and the focus lens position do not coincide with each other, the sum of the focus lens value P and the focus target value Pa is not 0, and this sum value is used as a focus control signal (hereinafter referred to as focus control signal). The value indicated by the signal is referred to as a focus control value.) Is output to the motor drive circuit 34, and the motor 36 is driven at a rotational direction and a rotational speed according to the sign control value. Move to the focus target position.
[0015]
When the cameraman manually performs the focus operation, the cameraman rotates the focus ring 42 of the focus demand (lens controller) shown in FIG. Thereby, the rotation angle of the focus ring 42 is detected by the potentiometer 44, and a voltage signal proportional to the rotation angle is a signal indicating the focus ring position (hereinafter referred to as a focus ring position signal or a focus instruction signal) from the potentiometer 44. Is output. The focus ring position signal output from the potentiometer 44 is converted into a digital signal by the A / D converter 46 and input to the CPU 32.
[0016]
The CPU 32 obtains the focus target position based on the focus ring position signal input from the potentiometer 44 in this way (a procedure for obtaining the focus target position will be described later), and the focus lens position is focused as described above. Move to the target position. Thereby, the focus lens 12 is moved by the focus operation of the cameraman, and the cameraman performs focus adjustment.
[0017]
The CPU 32 recognizes the focus ring position with the voltage value of the focus ring position signal in the same manner as the focus target position and the focus lens position, and this value is hereinafter referred to as the focus ring value Pc or the focus instruction value Pc. That's it. Further, there is an appropriate correspondence between the rotation angle of the focus ring 42 and the position of the focus lens 12. For example, the position of the stop end in the forward / reverse direction of the focus ring 12 and the infinity end / closest position of the focus lens 12. It is set so that the end position matches. The focus ring value Pc is set so that the sum with the focus lens value P is 0 when the rotation angle of the focus ring 42 and the position of the focus lens 12 have a corresponding relationship.
[0018]
Further, the CPU 32 obtains a focus target position based on a focus evaluation value obtained from an image signal when performing focus adjustment by auto-focusing or automatically correcting focus adjustment by manual operation of the cameraman. The focus lens 12 is moved to the target position. The CCD 20 shown in the figure photoelectrically converts the subject image formed on the image plane and inputs it to the imaging circuit 22 as an image signal. The imaging circuit 22 generates, for example, an NTSC video signal from the input image signal, and outputs this video signal to an external video display device 50 such as a viewfinder 48 or a monitor TV. As a result, the image being shot is displayed on the viewfinder 48 and the external image display device 50.
[0019]
On the other hand, a high-pass filter (HPF) 24 for obtaining a focus evaluation value, an A / D converter 26, a gate 28, and an adder 30 are connected in order to the imaging circuit 22, and the imaging circuit 22 is generated from an image signal. The luminance signal is output to the HPF 24, and the synchronization signal is output to the focus area selection gate 28, the adder 30, and the CPU 32 in accordance with the video signal.
[0020]
The HPF 24 extracts high frequency components included in the luminance signal. Since the extracted high-frequency component contains more as the image sharpness is higher, the average image sharpness level in the integration range can be quantified by integrating the high-frequency component.
The high-frequency component that has passed through the HPF 24 is converted into a digital signal by the A / D converter 26 and input to the focus area selection gate 28. The focus area selection gate 28 is a circuit that extracts only the signal corresponding to the focus area at the center on the imaging screen, and extracts only information related to the subject (main subject) imaged in the focus area.
[0021]
The digital signal extracted by the focus area selection gate 28 is input to the adder 30, and the digital signal for one field is integrated. The integrated value is input to the CPU 32 as a focus evaluation value indicating the sharpness of the image.
When performing normal autofocus, the CPU 32 moves the focus lens 12 in a hill-climbing operation, inputs a focus evaluation value from the adder 30, detects a position where the focus evaluation value is maximized, and determines the position. The focus lens is moved to the focus target position as the focus target position.
[0022]
On the other hand, when automatic adjustment (automatic focus correction) is performed for manual focus adjustment by the cameraman, the specific procedure will be described later. When the cameraman operates the focus ring 42, the CPU 32 operates the focus ring. The focus lens 12 is moved based on the position, and the focus lens position input from the potentiometer 40 and the focus evaluation value input from the adder 30 during this movement are recorded in a storage unit (not shown) in the CPU 32. . When the focus operation of the cameraman is finished and the focus ring position is stopped, a focus lens position Pmax having the maximum focus evaluation value is obtained based on the focus lens position and the focus evaluation value stored in the storage unit, and this is used as the focus lens position. The focus lens 12 is moved to the position Pmax as the target position.
[0023]
Thereby, the focus adjustment by the manual operation of the cameraman is automatically corrected, and the high-precision focus adjustment that is difficult by the manual operation of the cameraman is performed.
Next, the control contents of the CPU 32 will be described in detail. In the following, the contents of control when automatic focus correction is performed after the cameraman's focus adjustment will be described. 2 and 3 are explanatory diagrams showing an outline of the control contents by the CPU 32, and an example of the movement locus of the focus lens 12 controlled by the CPU 32 is shown. As shown in FIG. 2, the correspondence between the focus ring position (focus instruction position) and the focus lens position is indicated by a straight line x = y where x is the focus ring position and y is the focus lens position. For the sake of convenience, when the focus ring position is represented by x, the corresponding focus lens position is represented as a point on the straight line y = x. First, when the focus ring position and the focus lens position are moved to the positions indicated by (1) in the figure by the cameraman's focus operation, the focus lens 12 is detected by detecting the maximum position of the focus evaluation value (automatic focus correction). Is moved to the position indicated by (2). In this state, when the focus ring position is changed by the camera operator's focus operation next time, the CPU 32 does not immediately return the focus lens 12 to the straight line y = x, but the straight lines (2) to (3) in FIG. Or, as indicated by the straight line from (2) to (3), it is moved while gradually reducing the difference from the straight line y = x. That is, when the CPU 32 detects that the focus ring position changes from the position (2) in the direction of decreasing, the CPU 32 moves the focus lens 12 along the straight line y = ax + m, and the straight line y = x indicated by (3). Move to the intersection with. When the position (3) is reached, the focus lens 12 is moved along the straight line y = x.
[0024]
On the other hand, when it is detected that the focus ring position changes from the position (2) in the increasing direction, the focus lens 12 is moved along the straight line y = bx + n, and the straight line y = x indicated by (3) ' Move to the intersection. When the position {circle over (3)} is reached, the focus lens 12 is moved along the straight line y = x.
Note that the conditions of the straight line slopes a and b shown in the figure are a <1 (preferably 0 <a <1) and b> 1, where a is smaller than the straight line y = x and b is the straight line y. Is set to be greater than the slope of x. For example, a = 1/2 and b = 2 are preferable. M and n are values determined by the position {circle around (2)}.
[0025]
Unlike the case shown in FIG. 2, when the direction of the focus ring position is changed from the position indicated by (2) before reaching the straight line y = x, as shown in FIG. According to the changing direction, the straight lines with the inclinations a and b are connected to reach the straight line y = x. That is, when it is detected that the focus ring position changes in a decreasing direction, the focus lens 12 is moved from the straight line with the inclination a (from (2) to (3) as in the case shown in FIG. The straight line y = ax + m or the straight line y = ax + m from (3) to the position indicated by (4) is detected. On the contrary, it is detected that the focus ring position has changed in the increasing direction. In this case, the focus lens 12 is moved to a straight line with an inclination b (straight line y = bx + n from the position indicated by (2) to (3) 'or straight line y = bx + p from the position indicated by (3) to (4)). Move along.
[0026]
As described above, as shown in FIGS. 2 and 3, the shift of the focus lens position with respect to the focus ring position caused by the automatic focus correction is gradually reduced with the operation of the focus ring 42, so that the photographer does not feel uncomfortable. A focus operation can be performed, and a problem that a large deviation occurs between the stop end of the focus lens 12 and the stop end of the focus ring 42 (potentiometer 44) can be prevented. If it is determined that the stop end is displaced, the amount of decrease may be forcibly increased.
[0027]
FIG. 4 shows the calculation contents of the CPU 32. As shown in the figure, the CPU 32 inputs a focus lens value P from the potentiometer 40 and also inputs a focus ring value (focus instruction value) Pc from the potentiometer 44. The A / D converter 38 and the A / D converter 46 shown in FIG. 1 are omitted. The focus lens value P and the focus ring value Pc shown here are the voltage values of the voltage signals input from the potentiometers as described above, and when the focus lens 12 is at the position indicated by the rotation angle of the focus ring 42, that is, As shown in FIGS. 2 and 3, when the focus lens position and the focus ring position are on the straight line y = x, the signs of the focus lens value P and the focus ring value Pc are reversed, and P + Pc = 0.
[0028]
Further, the CPU 32 calculates a correction amount Pe for correcting the focus ring value Pc. The content of the correction amount Pe will be described later, and the CPU 32 adds the focus ring value Pc and the correction amount Pe as shown in FIG. That is, Pa = Pc + Pe is obtained. Then, a value Pa + P obtained by adding the focus lens value P to the focus target value Pa is output to the motor drive circuit 34 as a focus control value. Accordingly, the focus lens 12 moves to a position where Pa + P = 0, that is, a focus target position. As a result, the correction amount Pe = −Pc−P, and the correction amount Pe indicates the amount of deviation between the focus ring value Pc and the focus lens position P.
[0029]
The contents of the correction amount Pe will be described. When the focus operation by the photographer is finished, the CPU 32 next sets the focus lens position to the maximum position Pmax of the focus evaluation value (more precisely, Pmax is the focus at which the focus evaluation value is the maximum). In order to perform focus correction to be moved to the lens value P), as the correction amount Pe, the shift amount Pe = −Pc− between the focus ring value Pc, that is, the current focus lens value P and the maximum position Pmax of the focus evaluation value. Pmax = P−Pmax is calculated. In this case, the focus target value Pa is a value Pa = Pc + Pe = −Pmax obtained by adding the correction amount Pe to the focus ring value Pc, and a value Pa + P obtained by adding the focus lens position P to the focus target value Pa is used as a focus control value. Output to the motor drive circuit 34. As a result, the focus lens 12 moves to a position where −Pmax + P = 0, that is, a maximum focus evaluation value position Pmax.
[0030]
On the other hand, when some correction amount Pe is already given, that is, when there is a deviation between the focus ring value Pc and the focus lens value P, the correction amount Pe at this time is the deviation amount between the focus ring value Pc and the focus lens value P. And Pe = −Pc−P. When the automatic focus correction based on the focus evaluation value is completed, Pe = −Pc−Pmax. When the cameraman operates the focus ring 42 at this time, the CPU 32 decreases the absolute value of the correction amount Pe by a certain amount every time the focus ring 42 rotates by a predetermined angle. For example, when the focus ring value Pc moves by a unit amount in a direction approaching the previous focus target value Pa = −P (that is, the current focus lens position), the correction amount Pe is reduced by a half of the unit amount, When the focus ring value Pc moves by a unit amount in a direction away from the previous focus target value Pa = −P, the inclination a = 1 shown in FIGS. 2 and 3 is reduced by subtracting the correction amount Pe from the unit amount. The focus lens 12 can be moved along a straight line of / 2, b = 2.
[0031]
Next, the processing procedure of the CPU 32 will be described with reference to the flowcharts of FIGS. Explaining from the flowchart shown in FIG. 5, first, the CPU 32 determines whether or not a focus operation is performed by a cameraman (step S10). That is, it is determined whether or not the voltage signal indicating the rotation angle of the potentiometer 44 has changed due to the rotation of the focus ring 42. If NO, the process of step S10 is repeated. If the focus operation is YES, the counter indicating the address of the storage unit in the CPU 32 is set to 0 (step S12). Then, the focus evaluation value is read from the adder 30 and recorded in the address of the storage unit of the CPU 32 indicated by the counter (step S14). Next, the counter is incremented by 1 (step S16), the position of the focus lens 12, that is, the focus lens value P is read, and the focus lens value P is stored in the address indicated by the counter (S18).
[0032]
Next, moving to the flowchart shown in FIG. 6, it is determined whether or not a focus operation is being performed (step S20). That is, it is determined here whether or not the focus operation is continued. If the focus operation continues, it is determined whether or not the correction amount Pe (= −Pc−P) is 0 (step S22). Here, in the case of YES, since the focus instruction position Pc and the focus lens position P coincide with each other, the following steps S24 and S26 are skipped and the process proceeds to step S28. On the other hand, in the case of NO, the focus instruction position (focus ring position), that is, the focus instruction value Pc is detected, and it is determined whether or not the focus instruction value Pc has moved by the unit movement amount from the previous detection (step S24). ). In the case of NO, the next process is skipped and the process proceeds to step S28. In the case of YES, the correction amount Pe is reduced by a predetermined amount as described above (S26), and the value is set as a new correction amount Pe. Then, after calculating the focus target value Pa = Pc + Pe, a value Pa + P obtained by adding the focus target value Pa and the focus lens value P is output to the motor drive circuit 34 as a focus control value.
[0033]
Next, the counter is incremented by 1 (S28), and it is determined whether or not the counter exceeds the maximum address m (m is an odd number) of the storage unit (S30). If the maximum address m is exceeded, the counter is reset to 0 (S32), and the process returns to step S14. The counter is reset to 0 in order to rewrite new data in order from old data.
[0034]
The CPU 32 repeats the processes from step S14 to step S32 while the focus operation is performed by the cameraman, and outputs the focus control value Pa + P to the motor drive circuit 34 in the vertical blanking period to thereby adjust the focus lens 12. Move to the focus target position. As a result, the focus lens 12 moves so as to approach the focus instruction position by the focus ring 42 while gradually reducing the amount of shift caused by the automatic focus correction.
[0035]
Next, when it is determined as NO in step S20, that is, when the focus operation by the photographer is finished, the focus evaluation values stored in the storage unit of the CPU 32 by the processing from step S14 to step S32 are selected. The maximum focus evaluation value is detected (step S34). When the maximum focus evaluation value is detected, the focus lens position recorded at the address next to the address where the maximum focus evaluation value is recorded (that is, the focus lens value when the maximum focus evaluation value is detected). P) is substituted for Pmax (step S36). Next, it is determined whether or not the value of Pmax is the extreme end position among the focus lens positions recorded in the storage unit of the CPU 32 (step S38). In the case of YES, there is a possibility that there is a focus lens position where the focus evaluation value is maximized in addition to the focus lens position of Pmax. Therefore, the focus is based on the focus lens position and focus evaluation value recorded in the storage unit of the CPU 32. The position where the evaluation value is maximized is calculated using, for example, Lagrange interpolation. Then, the calculated focus lens position is substituted for Pmax (step S40).
[0036]
When the focus lens position Pmax at which the focus evaluation value is maximized is obtained, the CPU 32 calculates a correction amount Pe = −Pc−Pmax from the focus instruction value Pc and the maximum position Pmax of the focus evaluation value (step S42). Then, the correction amount Pe is added to the focus instruction value Pc to change the focus instruction value Pc to the focus target value Pa = Pc + Pe = −Pmax (step S44), and the changed focus instruction position, that is, the focus target value Pa. The focus lens 12 is moved to = -Pmax (position where the focus evaluation value is maximized).
[0037]
After the above process, the process returns to step S10 in FIG. 5 and waits until the focus operation by the cameraman is performed again. When the focus operation by the cameraman is performed, the above process is repeatedly executed.
As described above, in the above embodiment, the case where the automatic focus correction after the focus operation is performed based on the focus evaluation value obtained when the focus operation by the cameraman is performed has been described, but the present invention is not limited to this. The camera can be used in a camera that performs focus correction or focus adjustment by another method after the focus operation of the cameraman. That is, the present invention eliminates this shift when there is a shift between the focus lens position indicated by the operation member (focus ring 42) operated by the cameraman and the focus lens position specified by other focus means. This can be applied to the case where it is gradually reduced without a sense of incongruity.
[0038]
In the above embodiment, the focus correction is automatically performed after the focus operation by the photographer is completed. However, the present invention is not limited to this, and the focus correction may be started by a switch or the like.
[0039]
【The invention's effect】
As described above, according to the camera lens driving device of the present invention, when the manual operation member is operated by the cameraman, the focus lens is moved by controlling the motor based on the operation of the operation member (first operation). When the operation of the operation member is completed, the focus lens is driven by the automatic focusing means to perform the second focusing. In this case, due to the movement of the focus lens by the automatic focusing means, a shift occurs between the position of the focus lens instructed by the manual focusing means and the current position of the focus lens. When operated, the focus lens is driven so that the deviation is gradually reduced. As a result, when the operating member is operated, the focus lens gradually approaches the position indicated by the operating member, so that it is possible to perform a focus operation that is comfortable for the photographer, and the stop end of the focus lens. It is possible to prevent a problem that the stop end (the stop end of the potentiometer) of the operation member of the focus operation unit does not match.
[0040]
In addition, manual operation members such as a TV camera are mainly used for detecting the position of the operation member with a potentiometer. Therefore, by applying the present invention, it is possible to use a controller similar to other TV cameras. There is.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an internal configuration of a television camera to which a lens driving device for a camera according to the present invention is applied.
FIG. 2 is an explanatory diagram showing an outline of the control contents of the CPU shown in FIG. 1;
FIG. 3 is an explanatory diagram showing an outline of the control contents of the CPU shown in FIG. 1;
FIG. 4 is an explanatory diagram showing calculation contents of the CPU shown in FIG. 1;
FIG. 5 is a flowchart showing a processing procedure of the CPU shown in FIG. 1;
FIG. 6 is a flowchart illustrating a processing procedure of the CPU illustrated in FIG. 1;
[Explanation of symbols]
10 ... Photography optical system
12 ... Focus lens
14 ... Variable lens
16 ... Master lens
18 ... Aperture
20 ... CCD
22 ... Imaging circuit
24 ... HPF
28 ... Focus area selection gate
30 ... Adder
32 ... CPU
34 ... Motor drive circuit
36 ... Motor
42. Focus ring

Claims (1)

Manual focusing means for controlling the motor based on the operation of the manual operation member to drive the focus lens; and automatic focusing means for automatically controlling the motor to drive the focus lens; In the lens driving device of the camera that performs the second focusing by the automatic focusing means after the first focusing by the means is completed,
A deviation amount calculating means for obtaining a deviation amount between a position of the focus lens instructed by the manual focusing means and a current position of the focus lens;
Control means for driving the focus lens so that the shift amount is gradually reduced when the manual focusing means is re-driven;
A lens driving device for a camera, comprising:

Images