WO2004046782A1

WO2004046782A1 - Lens driver and imaging apparatus

Info

Publication number: WO2004046782A1
Application number: PCT/JP2003/013831
Authority: WO
Inventors: Sakae Okazaki; Hidenori Kushida
Original assignee: Sony Corporation
Priority date: 2002-11-19
Filing date: 2003-10-29
Publication date: 2004-06-03
Also published as: JP2004170612A

Abstract

A lens driver and an imaging apparatus in which shift of the focus from an object due to variation in the position of a quantity-of-light-adjusting filter can be avoided by controlling the position of a focus lens depending on the position of the quantity-of-light-adjusting filter. The imaging apparatus comprises a focus lens driving means for moving the position of the focus lens adjusting the focus for the object, a focus position detecting means for detecting the moving amount of the focus lens being moved by the focus lens driving means, a means for detecting the position of a filter adjusting the quantity of light from the object, and a focus correction amount calculating means performing correction control of the focus position from the focus position detecting means depending on the position of the quantity-of-light-adjusting filter detected by the means for detecting the quantity-of-light-adjusting filter.

Description

TECHNICAL FIELD Lens driving device and imaging device

The present invention relates to a lens driving device and an imaging device, and more particularly, to a lens driving device having a mechanism for performing a focus operation and a zoom operation, and an imaging device using the lens driving device. Background art

The lens driving device and the imaging device according to the related art, when manually adjusting the focus on the subject and fixing the focus lens, adjust the amount of light from the subject according to the state of the diaphragm. The focus correction amount for detecting the aperture value of the aperture for adjusting the amount of light from the subject, and correcting and controlling the focus position according to the detected aperture value. (For example, see Japanese Patent Application Laid-Open No. Hei 9-331719 (FIG. 4, page 4)). However, in the imaging device described in the prior art, the depth of focus has been reduced due to the increase in the number of pixels such as a CCD (Charge Coupled Device) and the size of the imager, and the size of the imager has been reduced. With the introduction of a multi-density light control filter (ND), as a countermeasure against small aperture due to diffraction phenomena due to the phenomena, the focus shift of the subject due to the change of the ND state cannot be ignored. . Therefore, there is a problem in that the subject is out of focus due to a change in the ND state after focusing on the subject manually or automatically. Therefore, the focus correction amount is calculated according to the ND position and the zoom position, the manual focus or the auto focus movement amount is added, and the result is output as the movement amount of the focus lens, thereby eliminating the defocus of the subject. In particular, there are problems that must be solved. Disclosure of the invention

In order to achieve the above object, a lens driving device and an imaging device according to the present invention have the following configurations.

(1) The lens driving device includes: a focus lens driving unit that moves a position of a focus lens for adjusting a focus with respect to a subject; and a focus position based on a moving amount of the focus lens that is moved by the force lens driving unit. Focus position detecting means for detecting, ND position detecting means for adjusting the amount of ND from the subject, and ND position detecting means for detecting the ND position, and focus position detecting according to the ND position from the ND position detecting means And a focus correction amount calculating means for calculating a focus correction amount for correcting and controlling a focus position from the means.

(2) Further, a zoom lens driving means for moving a position of a zoom lens for changing a focal length, and a zoom position detecting means for detecting a zoom position based on a moving amount of the zoom lens moved by the zoom lens driving means. Wherein the focus correction amount calculating means corrects the focus position from the focus position detecting means according to the ND position from the ND position detecting means and the zoom position from the zoom position detecting means. The lens drive device according to (1), wherein a focus correction amount to be calculated is calculated.

(3) The lens driving device comprises: a focus lens driving means for moving a position of a focus lens for adjusting a focus on a subject; A focus position detecting means for detecting a focus position based on a moving amount of the focus lens moved by the lens driving means; and an iris position detecting means for detecting a position of an iris for adjusting a light amount from the object. The ND position detecting means for detecting the ND position for adjusting the amount of light from the subject; and the focus position according to the iris position from the iris position detecting means and the ND position from the ND position detecting means. And a focus correction amount calculating means for calculating a focus correction amount for correcting and controlling the focus position from the detecting means.

(4) Further, a zoom lens driving means for moving a position of a zoom lens for changing a focal length, and a zoom position detecting means for detecting a zoom position based on a moving amount of the zoom lens moved by the zoom lens driving means. The focus correction amount calculating means, wherein the focus correction amount calculating means is configured to change the focus correction amount according to the iris position from the iris position detecting means, the ND position from the ND position detecting means, and the zoom position from the zoom position detecting means. The lens driving device according to (3), wherein a focus correction amount for correcting and controlling a focus position from the residue position detecting means is calculated.

(5) The imaging device detects a zoom position based on a focus lens driving unit that moves a position of a focus lens that adjusts a focus on a subject, and a movement amount of the focus lens that is moved by the focus lens driving unit. A focus position detecting means, an ND position detecting means for adjusting a light amount from the subject, an ND position detecting means, and a focus position from the focus position detecting means according to the ND position from the ND position detecting means. A focus correction amount calculation unit for calculating a focus correction amount for correction control; an imaging unit for receiving light from the subject through the focus lens and converting the light into an image signal; and processing a pixel signal from the imaging unit And a signal processing means for outputting a video signal. (6) Further, a zoom lens driving means for moving a position of a zoom lens for changing a focal length, and a zoom position detecting means for detecting a zoom position based on a moving amount of the zoom lens moved by the zoom lens driving means. Wherein the focus correction amount calculating means corrects the focus position from the focus position detecting means according to the ND position from the ND position detecting means and the zoom position from the zoom position detecting means. The imaging device according to (5), wherein a focus correction amount to be calculated is calculated.

(7) The imaging device detects a zoom position based on a focus lens driving unit that moves a position of a focus lens that adjusts a focus with respect to a subject, and a movement amount of the focus lens that is moved by the focus lens driving unit. A focus position detecting means, an iris position detecting means for detecting a position of an iris for adjusting a light amount from the subject, an ND position detecting means for detecting a ND position for adjusting a light amount from the subject, and the iris position Focus correction amount calculating means for calculating a focus correction amount for correcting and controlling a focus position from the focus position detecting means according to an iris position from the detecting means and an ND position from the ND position detecting means. And receives light from the subject through the focus lens and converts it into an image signal An imaging unit that will comprise a signal processing means for outputting a video signal by performing processing on the pixel signals from the image pickup means.

(8) Also, a zoom lens driving means for moving a position of a zoom lens for changing a focal length, and a zoom position detecting means for detecting a zoom position based on a moving amount of the zoom lens moved by the zoom lens driving means. The focus correction amount calculating means, wherein the focus correction amount calculating means calculates the focus correction amount according to the iris position from the iris position detecting means, the ND position from the ND position detecting means, and the zoom position from the zoom position detecting means. (7) The imaging apparatus according to (7), wherein a focus correction amount for correcting and controlling a focus position from the one-cass position detection unit is calculated.

As described above, by calculating the focus correction amount for correcting and controlling the focus position based on the movement amount of the focus lens in accordance with the ND position, the position of the focus lens is controlled in accordance with the ND position. It is possible to avoid a focus shift with respect to the subject due to a change in the position, that is, a so-called focus shift. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a configuration diagram of an imaging device according to the present invention.

FIG. 2 is a configuration diagram of the same lens drive circuit.

FIG. 3 is an explanatory diagram showing the relationship between the ND with the iris attached and the iris.

FIG. 4 is an explanatory diagram showing the relationship between an ND that can be controlled independently and an iris.

FIG. 5 is an explanatory diagram showing the relationship between the manually operated ND and the iris. BEST MODE FOR CARRYING OUT THE INVENTION

Next, embodiments of a lens driving device and an imaging device according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the image pickup apparatus including the lens driving device of the present invention includes a zoom lens 12, an iris (IRIS) 21,

Step motor 14 that moves the zoom lens 12 that changes the depth of field, equipped with the ND 24 and focus lens 13 and step that moves the position of the focus lens 13 that adjusts the focus on the subject ND position detection sensor that detects the ND position of the ND 24, the iris position detection sensor 23 that detects the position of the iris 21, and the lens driver 16 that drives the motors 14 and 15 Sensor 26, CCD (Charge Coupled Device) 17 that receives light from the subject through focus lens 13 and converts it into pixel signals, and iris position obtained by iris position detection sensor 23 Information S 4 is input, and an iris driver 22 that supplies an iris drive signal S 5 for driving the iris 21 to the iris 21, and ND position information S 6 obtained by the ND position detection sensor 26 are input, and ND An ND driver 25 that supplies an ND drive signal S 7 to the ND 24 to drive the ND 24, a camera signal processing circuit 18 that processes a pixel signal from the CCD 17 and outputs a video signal (video signal), Camera signal processing circuit 18 The AE processing circuit 27 that controls the ND driver 25 and the iris driver 22 and the autofocus drive amount S0 of the focus lens 13 is detected based on the luminance signal output from the camera signal processing circuit 18. Auto focus processing circuit 19 and auto focus drive amount S 0 from manual focus processing circuit 19, manual focus operation amount, zoom instruction signal, manual Z auto focus switching signal and lens 1 2 , 13, and a lens driving circuit 20. The configuration of the lens drive circuit 20 will be described later. The camera signal processing circuit 18 performs signal processing using the input electric signal, for example, to output a luminance signal Y and two color difference signals R-Y, Β-, which are used for color television broadcasting. A standard color television signal of the NTS C (National Television System Commite) or the PAL (Phase Alternating Line) system in which Υ is multiplexed is generated. This color television signal is output as a video signal. The auto-focus processing circuit 19 detects the auto-focus drive amount S 0 indicating the movement of the focus lens 13 during the auto-focus operation based on the luminance signal output from the camera signal processing circuit 18, Send to drive circuit 20. -As shown in FIG. 2, the lens drive circuit 20 performs the focusing based on the movement amount S 2 of the focus lens 13 (see FIG. 1) moved by the step motor 15 (see FIG. 1). The focus position detection circuit 35 for detecting the position, the zoom movement amount calculation circuit 39 for calculating the zoom movement amount S1 based on the zoom instruction signal, and the zoom movement amount S1 for the zoom movement amount calculation circuit 39 The zoom position detection circuit 38 detects the zoom position based on the ND position information S 6 from the ND position detection sensor 26 (see FIG. 1) and the iris position detection sensor 23 (see FIG. 1). According to the iris position information S4 and the zoom position from the zoom position detection circuit 38, the focus position correction amount S3 for correcting and controlling the focus position from the focus position detection circuit 35 is calculated, and the calculated value is added to the adder 34. Focus correction amount to send Output circuit 36, autofocus movement amount calculation circuit 31 that calculates the autofocus movement amount based on autofocus drive amount S0 and sends it to signal switch 33, and manual focus based on manual focus operation amount A manual focus moving amount calculating circuit 32 for calculating the moving amount, a signal switch 33 for switching between a signal from the autofocus moving amount calculating circuit 31 and a signal from the manual focus moving amount calculating circuit 32, and a signal An adder 3 4 that adds the signal from the switch 33 and the focus position correction amount S 3 from the focus correction amount calculation circuit 36 to generate the movement amount S 2 of the focus lens 13 (see FIG. 1) 3 4 Consists of

Here, ND and iris will be described. The ND and the iris are so-called diaphragms. Some control the ND and the iris independently, and some operate the ND manually.

As shown in Fig. 3, the aperture mechanism with the iris attached to the ND consists of four sides with a triangular notch at the bottom, with the iris 21 A with the notch at the tip facing vertically, and intersecting the two. To form a hexagonal throttle hole 41. ND 24A is attached to a triangular portion at the bottom located above the iris 21A. The aperture 41 having such a structure is configured such that when the iris 21A is apertured down, the aperture size shrinks, and the ratio of the ND 24A to the opening diameter naturally increases. To be specific, when it is dark, the iris hole 41 naturally widens, forming a pentagonal opening hole 41A as shown in Fig. 3 (A), and the upper part is covered by ND 24A. It will be in the state of having done. Next, when squeezed, as shown in FIG. 3 (B), the upper part of the pentagon is almost half, and the iris hole 41 B is closed with the ND 24 A.

Further, when it is bright, the iris hole further collapses, and as shown in FIG. 3 (C), the iris hole 41C is formed in a substantially triangular shape, and the ND 24A faces the upper part.

Further, in the case of bright, the iris hole is further narrowed down, and the iris hole 41 D becomes a small triangle as shown in FIG. 3 (D).

Further, in the case of bright, the aperture is narrowed down, and as shown in FIG. 3 (E), the triangular iris hole 41E is further reduced to a point-like hole.

Further, when it becomes brighter, the aperture is further narrowed down, and as shown in Fig. 3 (F), the iris hole is completely closed, and a rhombic shape formed by the ND 24A and the triangle at the bottom of the iris 21A become.

Further narrowing down reduces the diamond-shaped shape as shown in Fig. 3 (G). Similarly, as shown in FIG. 3 (H), the drawing is narrowed down so that the rhombic shape becomes even smaller.

The iris mechanism shown in Fig. 4 controls the ND 24B independently. As shown in Figs. 4 (A) to 4 (C), the iris 21B in the vertical position is moved in a direction intersecting each other. Refine.

Then, if the iris 21B is narrowed down as shown in FIGS. 4 (D) to 4 (F), the ND 24B is controlled and then narrowed down as shown in FIGS.

Next, when it is brighter, as shown in FIGS. 4 (G) to 4 (H), with the ND 24B narrowed down, the iris 21B is then moved to further narrow down.

In the aperture mechanism shown in Fig. 5, the ND is manually operated, and the ND 24C is only turned on and off, there is no intermediate position, and the ND 24C is turned on / off by the user.

First, as shown in Figs. 5 (A) to (C), the iris 21C is moved in the direction intersecting and squeezed. At this time, ND 24 C is off. When the ND 24C is turned on when the throttle hole is the largest, that is, in the state shown in Fig. 5 (A), the ND 24C closes the fire hole as shown in Fig. 5 (D). . At this time, the iris is opened by the iris control loop, which is equivalent to darkening the subject. Similarly, Figs. 5 (E) to 5 (H) show the state when the ND 24C is turned on when the iris hole is squeezed according to the brightness. Turn the ND 24 C on and off.

Next, the operation of the imaging device having the above configuration will be described with reference to FIGS. First, when capturing an image of a subject, light from the subject is formed and received by a solid-state imaging device, specifically, a CCD 17, as an imaging device via a zoom lens 12 and a focus lens 13. . The CCD 17 is an image sensor composed of a plurality of light receiving units, a so-called imager. The amount of light received and detected by the CCD 17 is converted into an electric signal. The electric signal output from the CCD 17 is output to the camera signal processing circuit 18.

At the time of this imaging, the zoom lens 12 is used to change the depth of field, and the focus lens 13 is used to adjust the focus on the subject. The zoom lens 12 is driven by a step motor 14 driven and controlled by a control signal from a lens driver 16, and its position is controlled to move, so that the depth of field can be varied. it can. Further, the focus lens 13 is driven by a step motor 15 which is driven and controlled by a control signal from a lens driver 16, and its position is controlled to move so that the focus on the subject can be adjusted. In monkey.

The ND 24 is driven and controlled by the ND driver 25 in order to adjust the amount of light from the subject. This makes it possible to adjust the amount of light from the subject. The ND position of ND 24 is detected by ND position detection sensor 26. The detected ND position is sent to the lens drive circuit 20 as ND position information S6.

The luminance signal output from the camera signal processing circuit 18 is sent to the autofocus processing circuit 19, and the autofocus driving amount S0 indicating the movement of the focus lens during the autofocus operation is detected. . This auto focus drive amount S 0 is sent to the lens drive circuit 20. The lens drive circuit 20 calculates the amount of movement of the focus lens during the autofocus operation from the autofocus drive amount S0 from the autofocus processing circuit 19, and calculates the position of the focus lens 13 from the amount of movement of the focus lens. Is detected. Further, at the time of the manual focus operation, the position of the focus lens 13 is detected by calculating the movement amount of the focus lens 13 from the manual focus operation amount. The ND position information S 6 from the ND position detection sensor 26, that is, the ND position of the ND 24 is input to the lens drive circuit 20. In the lens drive circuit 20, the focus indicating the amount of movement of the focus lens 13 for controlling the movement of the focus lens 13 so as to focus on the subject in accordance with the change in the ND position The movement amount S 2 of the lens 13 (see FIG. 1) is generated. The movement amount S 2 of the focus lens 13 is sent to the lens driver 16. The lens driver 16 controls the driving of the step mode 15 based on the movement amount S2 of the focus lens 13 so that the position of the focus lens 13 is moved so that the subject is in focus. Is done.

At the time of zoom operation, a zoom instruction signal is input to the lens drive circuit 20. The lens drive circuit 20 generates a zoom movement amount S1 indicating the movement amount of the zoom lens 12 for controlling the movement of the zoom lens 12 in accordance with the zoom instruction signal. This zoom movement amount S 1 is sent to the lens driver 16. The lens driver 16 controls the drive of the step motor 14 based on the zoom movement amount S1, thereby controlling the movement of the position of the zoom lens 12 and adjusting the depth of field.

During the auto focus operation, the auto focus movement amount S 0 from the auto focus processing circuit 19 in FIG. 1 is input to the auto focus movement amount calculation circuit 31 shown in FIG. This auto focus movement amount calculation The output circuit 31 calculates the amount of movement of the focus lens 13 during the autofocus operation. The calculated movement amount of the focus lens 13 is sent to the terminal a of the signal switch 33.

At the time of manual focus operation, the manual focus operation amount is input to the manual focus movement amount calculation circuit 32. The manual focus operation amount is determined by mechanical or electrical means such as the movement position of the focus lens 13 when the focus operation is performed manually and the rotation angle of the focus ring for moving the position of the focus lens 13. This is the amount of movement of the focus lens 13 obtained by detection. Thus, the manual focus movement amount calculating circuit 32 calculates the movement amount of the focus lens 13 during the manual focus operation. The calculated amount of movement of the focus lens 13 is sent to the terminal b of the signal switch 33.

Here, the signal switch 33 is switched and connected to the terminal a during the autofocus operation, and is switched and connected to the terminal b during the manual focus operation, by a switching signal. When the signal switch 33 is switched, the movement amount of the focus lens 13 during the autofocus operation or the manual focus operation is sent to the adder 34. The output from the adder 34 is sent to the focus position detection circuit 35 and also sent to the lens driver 16 as the movement amount S 2 of the focus lens 13. The focus position detection circuit 35 detects the focus position based on the amount of movement of the focus lens 13 and outputs a focus position signal. This focus position signal is sent to the focus correction amount calculation circuit 36. The ND position information S 6 from the ND position detection sensor 26, that is, the ND position of the ND 24 is input to the focus correction amount calculation circuit 36. This focus correction amount calculation circuit 36 uses the focus position signal, A focus correction amount for correcting the position of the focus lens 13 is calculated according to the change in the ND position information S6 so as to focus on the subject, and is output to the adder.

In the adder 34, the focus correction amount is added to the movement amount of the focus lens 13 output via the signal switch 33, and the movement amount of the focus lens 13 is used as the movement amount S2 of the focus lens 13. By being sent to the lens driver 16, the position of the focus lens 13 can be controlled so that the subject is always focused even if the ND position of the ND 24 changes.

Here, the focus correction amount according to the ND position of the ND 24 is represented by the following formula (1), where 関数 is a function for obtaining the correction amount for correcting the position of the focus lens 13 corresponding to the ND position of the ND 24. ).

Focus correction amount = f (ND position) · · · (1)

Next, a case where the zoom position is used when controlling the position of the focus lens 13 according to the change in the ND position of the ND 24 will be described.

The zoom instruction signal input during the above-described zoom operation is sent to the zoom movement amount calculation circuit 39 of the lens drive circuit 20. The zoom movement amount calculation circuit 39 calculates the movement amount of the zoom lens 12. The calculated movement amount of the zoom lens 12 is sent to the zoom position detection circuit 38 and also sent to the lens driver 16 as the zoom movement amount S1. The zoom position detection circuit 38 detects the zoom position based on the amount of movement of the zoom lens 12 and outputs a zoom position signal. This zoom position signal is sent to the focus correction amount calculation circuit 36. Note that the zoom position may be detected by a sensor or the like.

As described above, the focus correction amount calculation circuit 36 includes the ND position information S 6 from the ND position detection sensor 26, that is, the ND position of the ND 24 and The focus position signal from the focus position detection circuit 35 is input. In the focus correction amount calculation circuit 36, a focus correction amount is calculated according to the change of the ND position information S6 and the zoom position signal so that the subject is focused on, and output to the adder 34. Is done.

In the adder 34, the focus correction amount is added to the movement amount of the focus lens 13 output via the signal switch 33, and the movement amount of the focus lens 13 becomes the movement amount S of the focus lens 13. By being sent to the lens driver 16 as 2, the focus lens 13 is controlled so that it always focuses on the subject even if the position of the zoom lens 12 and the ND position of the ND 24 change. can do.

Here, the focus correction amount according to the ND position and the zoom position of the ND 24 is represented by f as a function for obtaining the correction amount for correcting the position of the focus lens 13 corresponding to the ND position of the ND 24, and Assuming that a function for obtaining a correction amount for correcting the corresponding position of the focus lens 13 is g, it is expressed by the following equation (2).

Focus correction amount = f (ND position) X g (zoom position) · · · (2) As a method of calculating the focus correction amount, the method of calculating by the above equation (1) or (2) is used. In addition, a method of obtaining the focus correction value based on the characteristics of the focus lens 13 may be used.

Further, in the image pickup apparatus of the above embodiment, a part of the focus lens driving unit and a part of the zoom lens driving unit are integrated and displayed as a lens driver 16. This lens driver 16 is provided with a focus lens. The lens driver 16 for controlling the driving of the lens 13 and the lens driver 16 for controlling the driving of the zoom lens 12 may be configured separately. As described above, the lens driving device according to the present invention calculates the focus correction amount for correcting and controlling the focus position based on the movement amount of the focus lens in accordance with the detected ND position, thereby obtaining the focus correction amount according to the ND position. By controlling the position of the focus lens, it is possible to avoid a shift in focus with respect to the object due to a change in the ND position, that is, a so-called focus shift. Specifically, during the manual focus operation, after the subject is focused, it is possible to prevent the subject from being out of focus due to a change in the ND position.

In addition, there is an effect that it is possible to prevent the subject from being out of focus due to a change in the ND position during the zoom tracking operation by the focus lens.

Also, by calculating a focus correction amount for correcting and controlling the focus position according to the zoom position based on the movement amount of the zoom lens and the ND position to be detected, the position of the focus lens according to the ND position and the zoom position is calculated. Since the control is performed, there is an effect that a focus shift due to a change in the ND position and a change in the zoom position can be avoided.

Claims

The scope of the claims

1. Focus lens driving means for moving the position of the focus lens for adjusting the focus with respect to the subject;

A focus position detecting means for detecting a focus position based on a movement amount of the focus lens moved by the focus lens driving means;

A light amount adjustment filter position detecting means for detecting the position of the light amount adjustment filter for adjusting the light amount from the subject;

Focus correction amount calculating means for calculating a focus correction amount for correcting and controlling the focus position from the focus position detecting means in accordance with the position of the light amount adjusting filter from the light amount adjusting filter position detecting means. Lens driving device.

2. Zoom lens driving means for moving the position of the zoom lens that changes the focal length;

Zoom position detecting means for detecting a zoom position based on a moving amount of the zoom lens moved by the zoom lens driving means, wherein the focus correction amount calculating means detects the light amount adjusting filter position. Calculating a focus correction amount for correcting and controlling a focus position from the focus position detecting means according to a light amount adjusting filter position from the means and a zoom position from the zoom position detecting means.

The lens driving device according to claim 1, wherein:

3. Focus lens driving means for moving the position of the focus lens for adjusting the focus with respect to the subject; A focus position detecting means for detecting a focus position based on a movement amount of the focus lens moved by the focus lens driving means;

Iris position detecting means for detecting the position of the iris for adjusting the amount of light from the subject,

A light amount adjusting filter for detecting the position of the light amount adjusting filter for adjusting the light amount from the subject;

Focus correction amount for correcting and controlling the focus position from the focus position detecting means according to the position of the iris from the iris position detecting means and the position of the light amount adjusting filter from the light amount adjusting filter. Focus correction amount calculating means for calculating

A lens driving device comprising: -

4. Zoom lens driving means for moving the position of the zoom lens that changes the focal length;

Zoom position detecting means for detecting a zoom position based on the amount of movement of the zoom lens moved by the zoom lens driving means, wherein the focus correction amount calculating means includes a iris position from the iris position detecting means. And calculating a focus correction amount for correcting and controlling the focus position from the focus position detecting means according to the light amount adjusting filter position from the light amount adjusting filter and the zoom position from the zoom position detecting means. thing

4. The lens driving device according to claim 3, wherein:

5. Focus lens driving means for moving the position of the focus lens for adjusting the focus on the subject,

Focus position detecting means for detecting a zoom position based on a movement amount of the focus lens moved by the focus lens driving means; Light amount adjustment filter position detecting means for detecting the position of the light amount adjustment filter for adjusting the light amount from the subject;

A focus correction amount calculating means for calculating a focus correction amount for correcting and controlling a focus position from the focus position detecting means according to the light amount adjusting filter position from the light amount adjusting filter position detecting means; Imaging means for receiving light from the subject through the camera and converting the light into an image signal;

Signal processing means for processing the pixel signal from the imaging means to output a video signal,

An imaging device comprising:

6. Zoom lens driving means for moving the position of the zoom lens that changes the focal length;

Zoom position detecting means for detecting a zoom position based on a moving amount of the zoom lens moved by the zoom lens driving means, wherein the focus correction amount calculating means includes a light amount adjusting filter position detecting means. Calculating a focus correction amount for correcting and controlling the focus position from the focus position detecting means in accordance with the light amount adjusting filter position from the camera and the zoom position from the zoom position detecting means.

6. The imaging device according to claim 5, wherein:

7. Focus lens driving means for moving the position of the focus lens for adjusting the focus on the subject;

Focus position detecting means for detecting a zoom position based on the amount of movement of the focus lens moved by the focus lens driving means; iris position detecting means for detecting a position of an iris for adjusting the amount of light from the subject; Light amount adjusting filter position detecting means for detecting the position of the light amount adjusting filter for adjusting the light amount from the subject;

A force correction amount for correcting and controlling a focus position from the focus position detecting means is calculated according to a position of the iris from the iris position detecting means and a light amount adjusting filter position from the light amount adjusting filter position detecting means. A focus correction amount calculating means for performing

Imaging means for receiving light from the subject through the focus lens and converting the light into an image signal;

An imaging device comprising:

8. Zoom lens driving means for moving the position of the zoom lens that changes the focal length;

Zoom position detecting means for detecting a zoom position based on the amount of movement of the zoom lens moved by the zoom lens driving means, wherein the focus correction amount calculating means includes a iris position from the iris position detecting means. And a focus correction amount for correcting and controlling a focus position from the focus position detecting means according to a light amount adjusting filter position from the light amount adjusting filter position detecting means and a zoom position from the zoom position detecting means. Calculating

8. The imaging device according to claim 7, wherein: