JPH08160291A - Autofocusing device - Google Patents

Abstract

PURPOSE: To focus an autofocusing device on the whole curved surface of a subject having the curved surface. CONSTITUTION: In a camera performing the autofocusing so as to maximize the high frequency component of a signal corresponding to a range-finding area provided on the image pickup surface of an imaging device 109, the range- finding area is provided on the edge side of the image pickup surface by a control part 115 in the case where a film or the page of a book, etc., having warpage is photographed, and the autofocusing that a focusing lens 105 is moved based on the obtained signal is performed. Thus, this device can be focused on the whole curved surface of the film or the page of the book, etc., having the warpage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic focusing device used in electronic still cameras, video cameras and the like. More specifically, the present invention relates to an automatic focusing device suitable for taking a silver halide photographic film or a thick book with these cameras.

[0002]

2. Description of the Related Art Conventionally, when a photograph taken with a silver halide camera is viewed on a monitor or image processing is performed by importing it into a computer, a developed silver halide photographic film is used with an electronic still camera or a video camera. I photographed and output the obtained electrical signals to a monitor or captured it in a computer. In this case, it is common to attach a silver salt photographic film to a dedicated adapter or the like to perform photography. This dedicated adapter (hereinafter called film adapter)
When the is attached to an electronic still camera or video camera, the distance from the shooting lens to the subject's silver halide film is almost constant, but the distance may change slightly due to the rattling of the film in the adapter. In many cases, focus adjustment is performed to correct the error.

When copying a book, the above camera may be used instead of the copying machine. In this case as well, when the camera is attached to a stand or the like and shooting is performed, focus adjustment is often performed for the same reason as in the case of the film.
Furthermore, it is common to perform this focus adjustment automatically,
Generally, a video camera or the like uses a so-called hill-climbing AF method in which a lens position where the high frequency component of a luminance signal obtained from an image pickup device such as a CCD is the maximum is a focusing position.
In this method, normally, as shown in FIG. 17, the central portion is set as the distance measuring area with respect to the photographing screen, and the lens position where the high frequency component of the luminance signal is maximum is focused on the subject within the distance measuring area. I was in position.

[0004]

Generally, a silver salt photographic film, a book or the like is warped as a whole and is not a perfect flat surface. That is, a curved surface is formed by the warp. In addition, the distance from the lens to the film adapter is very short in order to shoot the silver halide photographic film on the full screen. Therefore, the depth of field is very shallow.
In general, it is usual to drive the lens so that the focal point becomes the center of the depth of field, but such a focusing operation is performed on the central portion of the screen as described above for the film. According to the method, the central portion of the film is located at the center within the depth of field, and although the central portion of the film is in focus, the peripheral portion is blurred and the entire surface of the film cannot be focused. In general, when you open a book, the pages are warped, and the thicker the book, the more pronounced this tendency becomes. In such a case, the same problem as that of the above-mentioned film occurs.

The present invention has been made to solve the above problems, and an object thereof is to obtain an automatic focusing device capable of focusing on the entire curved surface of a subject.

[0006]

According to a first aspect of the invention, a focus lens for adjusting the focus of a subject image, a focus lens driving means for driving the focus lens, and a subject image formed by the focus lens. A photoelectric conversion means for converting into an electric signal, an extraction means for extracting a signal indicating a high frequency component of the luminance of the subject from a signal of a predetermined portion of the output signal of the photoelectric conversion means, a mode setting means for setting an operation mode, There is provided control means for controlling the focus lens driving means in accordance with the signal extracted by the extracting means when the mode setting means sets a predetermined operation mode.

According to the invention of claim 5, a focus lens for adjusting the focus of the subject image, a focus lens driving means for driving the focus lens, and a subject image formed by the focus lens are converted into an electric signal. The photoelectric conversion means, an extraction means for extracting a plurality of signals indicating a high frequency component of the luminance of the subject from a plurality of portions of the output signal of the photoelectric conversion means, a mode setting means for setting an operation mode, and the mode setting means When a predetermined operation mode is set, there is provided control means for performing predetermined processing on the basis of the plurality of signals extracted by the extraction means and controlling the focus lens driving means according to the result of the processing.

According to the twelfth aspect of the present invention, a focus lens for adjusting the focus of the subject image, a photoelectric conversion means for converting the subject image formed by the focus lens into an electric signal, and a plurality of parts of the photoelectric conversion means. Means for extracting a plurality of signals indicating the high-frequency components of the brightness of the subject from the output signal, a mode setting means for setting the operation mode, a light amount limiting means for limiting the incident light from the subject, and the light amount limiting means. When the light amount limiting member driving means for driving the and the mode setting means sets a predetermined operation mode, predetermined processing is performed based on the plurality of signals extracted by the extraction means, and depending on the result of the processing. And a control means for controlling the light quantity limiting member driving means.

[0009]

With the above-described structure, even when shooting a subject having a curved surface such as a warped silver salt film or a thick book, it is possible to focus on the center of the warp of the film or book. You can focus on the whole page of a book. Particularly in the case of the invention of claim 3, when the warp of the film or book is large, the depth of field can be deepened by narrowing the diaphragm, so that the entire curved surface of the page of the film or book can be focused. .

[0010]

【Example】

(First Embodiment) An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a case where a silver halide film is used as a subject will be described. FIG. 1 is a block diagram of an electronic camera to which the present invention is applied. 101 is a fixed lens, 102
Is a light amount limiting member such as a diaphragm and a shutter, 103 is a motor for moving the diaphragm and the shutter, 104 is a mechanical drive circuit for driving the diaphragm and the shutter, and 105 is a focus lens for focusing on an image sensor 109 described later. Reference numeral 106 denotes a photo interrupter that detects the reset position of the focus lens 105, 107 a motor that moves the focus lens 105, 108 a focus lens drive circuit that drives the motor 107 to move the focus lens, and 109 electrically reflects light from the subject. An image sensor for converting into a signal, 110 is a timing signal generating circuit for generating a timing signal necessary for operating the image sensor 109, 111 is a CDS circuit for removing output noise of the image sensor 109 or before A / D conversion. Preprocessing circuit with non-linear amplification circuit 112 is an A / D converter.

Reference numeral 113 is a buffer memory, 114 is a memory controller for controlling memory read / write and DRAM refresh operation, 115 is a control section including a micro controller including a CPU for controlling the system such as a photographing sequence, and 116 is an operation. An operation display section 117 for displaying a display for assistance and a state of the camera, 117 is an operation section for operating the camera from the outside, and 118 is an electrically rewritable nonvolatile memory. Reference numeral 119 is an interface with an expansion unit to be described later, 120 is a removable expansion unit for connecting to the electronic camera body to perform various processes and operations, 121 is an interface for connecting with a recording medium 122 to be described later, and 122 is A recording medium such as a memory card or a hard disk, 123 is a main switch for turning on the power of the system, and 124 is an AF or AE.
Switch for shooting standby operation such as
W1), 125 is a shooting standby switch 124
After the operation of, a shooting switch for shooting (hereinafter referred to as SW2), 126 is a mode switch for setting a shooting mode,
Reference numeral 127 is a strobe, and reference numeral 128 is a film adapter which is used by loading a film for capturing an image of a silver salt film.

Next, the operation of the AF device according to the present invention will be described with reference to the flowchart of FIG. First, in step S201 (hereinafter, steps are omitted), the state of the main switch 123 is detected, and if ON, the process proceeds to step S202. In step S202, the remaining capacity of the recording medium 122 is checked. If the remaining capacity is 0, the process proceeds to step S203, and if not, step S2.
Go to 04. In S203, the remaining capacity of the recording medium 122 is 0.
And the process returns to S201. The warning may be displayed on the operation display unit 116, a warning sound may be output from a voice output unit (not shown), or both of them may be performed. S204
Then, the focus lens 105 is reset according to the flowchart of FIG. 3 described later. In S205, the state of SW1 is checked. If it is ON, the process proceeds to S207, and if not, the process proceeds to S206. In S206, the main switch 123
Is checked, and if it is ON, the process returns to S205, and if not, the process returns to S201.

In step S207, if the photographing mode of the camera is the film adapter mode, the process proceeds to step S209, and if not, the process proceeds to step S208. In S208, the distance measuring area within the shooting screen (conversion surface of the image sensor) is set to the first position. The first position means that the distance measuring area is located at the center of the screen as shown in FIG. In S209, the distance measuring area is set to the second position. The second position means that the distance measuring area is located outside the center of the screen as shown in FIG. In S210, the focus lens 105 is driven so that the high frequency component of the luminance signal of the video signal obtained from the image sensor 109 within the distance measurement area set in S208 or S209 is maximized. In S211, the state of SW2 is checked. If it is ON, the process proceeds to S213, and if not, the process proceeds to S212. In S212, the state of SW1 is checked and O
If it is N, the process proceeds to S211, and if not, the process proceeds to S205. In S213, the photographing operation is performed according to the flowchart of FIG. 4 described later. In S214, the remaining capacity of the recording medium 122 is checked. If the remaining capacity is 0, the process proceeds to S203, and if not, the process proceeds to S215. In S215, the state of SW2 is checked, and if it is not ON, the process proceeds to S212.

FIG. 3 is a subroutine showing the contents of the focus lens reset in S204 of FIG. Here, as shown in FIG. 7, the output of the photo interrupter 106 is “Lo” when the focus lens 105 is on the infinite end side with respect to the photo interrupter output switching position, and is “Hi” when it is on the close end side. Shall be. First S
At 301, the output state of the photo interrupter 106 is checked. If “Lo”, the process proceeds to S302, and if not, the process proceeds to S303. In S302, the focus lens 105 is determined to be on the infinite end side with respect to the photo interrupter output switching position by the output of the photo interrupter 106 in S301, so the focus lens 105 is moved to the closest end side by one step. In S303, the output state of the photo interrupter 106 is checked, and if "Hi", S
Go to 304, otherwise return to the main routine.
In S304, the focus lens 105 is determined to be on the closest end side with respect to the photo interrupter output switching position by the output of the photo interrupter 106 in S303, so the focus lens 105 is moved to the infinite end side by one step.

The operation when the focus lens 105 is reset in this way will be described. First, the focus lens 1 when the main switch 123 is turned on
If the position of 05 is on the infinite end side with respect to the photo interrupter output switching position, the photo interrupter 10
Since the output of 6 is "Lo", S301 and S30 of FIG.
By 2, the focus lens 105 is moved step by step toward the closest end side until the output of the photo interrupter 106 becomes “Hi”. When the photo interrupter output switching position in FIG. 7 is exceeded, the photo interrupter 106
Output changes to "Hi", so this time S3 in FIG.
In step 03, S304, the output of the photo interrupter 106 is moved to the infinite end side by one step until the output becomes "Lo". Thus, the focus lens 105 finally stops at the reset position in FIG.

When the position of the focus lens 105 when the main switch 123 is turned on is on the near end side with respect to the photo interrupter output switching position, the focus lens 105 is moved only to the infinite end side, and the photo lens When the output of the interrupter 106 becomes "Lo", it is stopped. In this way, as in the case where the position of the focus lens 105 when the main switch 123 is turned on is on the infinite end side with respect to the photo interrupter output switching position, the focus lens 105 is finally set to the reset position in FIG. Stop at.

FIG. 4 is a subroutine showing the contents of the photographing operation of S213 in FIG. First, in step S401, the subject brightness is measured. In step S402, the image sensor 109 is exposed according to the subject brightness measured in step S401. S
At 403, output noise removal from the image sensor 109 and non-linear processing performed before A / D conversion are performed. In S404, the analog signal from the preprocessing circuit 111 is converted into a digital signal. In S405, the output data from the A / D converter 112 is temporarily stored in the buffer memory 113 via the memory controller 114. In step S406, the data in the buffer memory 113 is transferred to the recording medium 122 such as a memory card attached to the camera body via the memory controller 114 and the recording medium interface 121.

In the camera constructed as shown in FIG. 1, the distance measuring area is at the first position in FIG. 5 when the photographing mode of the camera is the normal photographing mode. Normally, this is done because the subject is often located in the center of the screen for shooting. On the other hand, when the shooting mode of the camera is the film adapter mode, the distance measuring area is moved to the second position in FIG. This second position is located outside the distance measuring area at the time of normal shooting at the first position in FIG. This will be described in detail with reference to FIG.

When shooting a film, since the normal distance measuring area is near the center of the screen, when the distance is measured using the normal distance measuring area, the vicinity of the center of the film is in focus. However, many films are curved and curved, and even if the film is focused on the center like this, the edges of the film are blurred. In other words, the edge of the film goes out of the depth of field and blurs. On the other hand, FIG.
When the distance measuring area is moved to the outside of the normal distance measuring area as shown in (b), and more specifically to the position corresponding to the center of the film warp in FIG. 8A, the center of the film warp is focused. , The center and edge of the film also enter the depth of field, and the entire film is in focus. This will be described with reference to FIG.

When the film is warped, its center is located farthest from or closest to the fixed lens 101, but if the normal distance measuring area is used for focusing, the center of the film will be in focus. That is, the center of the depth of field is located farthest from or close to the lens, so that the edge of the film goes out of the depth of field and is blurred. On the other hand, if the distance measuring area is moved to a position corresponding to the center of the warp of the film, the center of the depth of field will be at the center of the warp of the film, so that the entire surface of the film will fall within the depth of field and The camera is in focus.
Even the warped film can be focused on the entire surface. Since the actual depth of field is deeper on the infinity side of the subject than on the lens side, it is more accurate to focus on the lens side rather than the center of the warp of the film in consideration of this.

Further, in the above-mentioned example, the distance measuring area is moved in the vertical direction, but it may be moved in the vertical direction, the horizontal direction, that is, the diagonal direction as shown in FIG. In either case of the lateral direction, the distance measuring area is located at the center of the warp, so that the above-described effect can be obtained regardless of the warp direction.

(Second Embodiment) Next, a second embodiment of the present invention will be described. In this example, when the shooting mode is the film adapter mode, a plurality of distance measuring areas (two in FIG. 11) are provided as shown in FIG. 11, and the maximum value of the high frequency component of the luminance signal obtained from each area is set. The focusing operation is performed using the subject distance range obtained from The basic operation is the same as in the first embodiment, and the shooting operation is performed according to the flowchart of FIG. At this time, the position of the distance measuring area in S209 of FIG. 2 is different from that of the first embodiment, and there are two positions of the first and second distance measuring areas as shown in FIG. When the operation mode of the camera is the film adapter mode, the distance measuring areas are set at two places as shown in FIG.

During the subsequent AF operation, the focusing operation is performed within the subject distance range obtained from the maximum value of the high frequency component of the luminance signal obtained from each distance measuring area. In the focusing operation, as in the first embodiment, the focus lens 105 is moved to a position where the high frequency component of the luminance signal obtained from the image sensor 109 is maximized. In order to obtain the maximum value of the high frequency component of the luminance signal (hereinafter, the focus evaluation value) from the two areas, the reading may be performed from two areas within one field, or one location may be read over two fields. This will be described with reference to the flowchart of FIG. 12, S201 to S207 and S211 to S215 are shown in FIG.
The same processing is performed and S1208 to S1210 are different from those in FIG.

If the photographing mode of the camera is the film adapter mode in S207, the process proceeds to S1210, and if not, the process proceeds to S1208. In step S1208, the distance measuring area within the shooting screen is set to the first position. The first position means that the distance measuring area is located at the center of the screen as shown in FIG. In step S1209, AF operation is performed to drive the focus lens 105 so that the high frequency component of the luminance signal of the video signal obtained from the image sensor 109 within the distance measurement area set in step S1208 is maximized.
Proceed to. In S1210, AF operation in the film adapter mode is performed according to the flowchart of FIG. 13 described later, and then the process proceeds to S211.

Next, the AF operation in the film adapter mode in S1210 will be described with reference to FIG. First, in step S1301, the distance measuring area is set to the first distance measuring area in FIG. In S1302, S1301
The focus lens 105 is driven so that the high frequency component of the luminance signal of the video signal obtained from the image pickup device 109 within the distance measurement area set in step 6 is maximized. In step S1303, the subject distance is obtained from the maximum value of the high frequency component of the luminance signal obtained in step S1302, and the value is stored.

In S1304, the distance measuring area is set to the second distance measuring area in FIG. In S1305, S13
The focus lens 105 is driven so that the high frequency component of the luminance signal of the video signal obtained from the image sensor 109 in the distance measurement area set in 04 becomes maximum. S130
In 6, the subject distance is obtained from the maximum value of the high frequency component of the luminance signal for the second ranging area obtained in S1305, and S
The subject distance range is obtained by taking the difference from the subject distance obtained from the focus evaluation value for the first distance measuring area stored in 1303. In S1307, the focus lens 105 is moved to a position where the entire surface of the film falls within the depth of field according to the subject distance with respect to the first and second ranging areas and the subject distance range obtained in S1306.

Further, a detailed description will be given with reference to FIG. FIG.
In the first distance measuring area at the center in (b) of FIG. 4, the central portion of the film is measured. If the center portion of the film is located farthest from the fixed lens 101, the focus evaluation value obtained from this distance measurement area is the value that indicates the farthest distance in the film plane. On the other hand, the edge of the film is measured in the second distance measuring area in the peripheral portion of the photographing screen. If the center of the film is located farthest from the fixed lens 101 as described above, the edge of the film is located closest to the fixed lens 101. Therefore, the focus evaluation value obtained from this distance measuring area is the film surface. It is the value that indicates the closest distance within.

The distance range of the object can be obtained by taking the difference between the two focus evaluation values thus obtained, in other words, the focus evaluation values representing the farthest distance and the closest distance in the film plane. The focus lens 105 is moved to a position where the distance range of the subject falls within the depth of field. By doing so, as in the first embodiment, the entire film surface falls within the depth of field, and even a warped film is focused on the entire curved surface. It is likewise apparent when the center of the film is closest to the fixed lens 101.

Although the second distance measuring area is set above the photographing screen in the above example, it may be set at the corner of the screen as shown in FIG. By doing so, as in the case of the first embodiment, even if the warp of the film is in the longitudinal direction or the lateral direction, the closest distance or the farthest distance from the fixed lens 101 can be obtained. The above-mentioned effects can be obtained. Further, in the above example, two distance measuring areas are set, but it is also possible to set three or more areas and take the average thereof.

(Third Embodiment) In the second embodiment, when the photographing mode of the camera is the film adapter mode, a plurality of distance measuring areas are provided and the focus evaluation value obtained from each area is within the object distance range. Was calculated and the focusing operation was performed using this value. In this case, there is no problem if the warp of the film is within the depth of field. That is, there is a problem if the difference between the distance corresponding to the focus evaluation value obtained from the first distance measuring area and the distance corresponding to the focus evaluation value obtained from the second distance measuring area is within the depth of field. There is no. However, when the film warps so much that it does not fall within the depth of field, it is impossible to focus on the entire surface of the film. Therefore, when the film warps so much that it does not fall within the depth of field, it is necessary to narrow the aperture to deepen the depth of field. This method will be described below.

The basic operation of the camera follows the flowchart of FIG. 12, but AF in the film adapter mode is performed.
The subroutine in the operation (S1210) is as shown in FIG. 16 will be described below. First, S1601
Then, the distance measuring area is set to the first distance measuring area in FIG. In step S1602, the focus lens 105 is driven so that the high frequency component of the luminance signal in the video signal obtained from the image sensor 109 within the distance measurement area set in step S1601 is maximized. In step S1603, the subject distance is obtained and stored from the maximum value of the high frequency components of the luminance signal obtained in step S1602.

In step S1604, the distance measuring area is set to the second distance measuring area in FIG. In S1605, S16
The focus lens is driven so that the high frequency component of the luminance signal of the video signal obtained from the image sensor 109 within the distance measurement area set in 04 becomes maximum. In step S1606, the difference between the subject distance obtained from the focus evaluation value for the second ranging area obtained in step S1605 and the subject distance obtained from the focus evaluation value for the first ranging area stored in step S1603 is calculated. Calculate the distance range.

In step S1607, the depth of field corresponding to the range of the subject distance obtained in step S1606 is obtained, and the aperture value with which the obtained depth of field is obtained is calculated. In S1608, the aperture value calculated in S1607 is stored. In S1609, the subject distance for the first and second ranging areas and S1
The focus lens 1 is placed at a position where the entire surface of the film falls within the depth of field according to the distance range of the subject obtained in 606.
Move 05. After that, at the time of photometry (S401) in FIG. 4, the aperture is stopped down to the aperture value or less stored in S1610. In this way, the entire surface of the film will be within the depth of field, and the entire surface of the film will be in focus.

Although the second distance measuring area is set above the photographing screen in the above example, it may be set at the corner of the screen as shown in FIG. 15 as in the second embodiment. In this way, as in the first and second embodiments, the fixed lens 1 can be used regardless of whether the warp of the film is in the vertical direction or the horizontal direction.
Since the shortest distance or the longest distance from 01 can be obtained, the above-described effect can be obtained regardless of the warp direction. Further, in the above-mentioned example, two distance measuring areas are set, but it is also possible to set three or more areas and take the average thereof.

Although the above-described first to third embodiments have been described with respect to a subject having a curved film or a curved surface such as a book, a subject having a surface having a shallow step may be used.

[0036]

As described above, according to the first aspect of the invention, when photographing a curved surface, the distance measuring area is provided at a predetermined position on the screen, so that a film, a thick book, or the like is provided. When shooting a subject with a curved surface, you can set the distance measurement area outside the center of the screen and focus on the center of the film or book warp, so the focus is only near the center of the curved surface. There is an effect that the peripheral part of the film is not blurred.

According to the invention of claim 5, a plurality of distance measuring areas are set, and the entire surface of the object is within the depth of field according to the range of the object distance obtained from the focus evaluation value obtained from each area. By arranging the lens to be driven so as to fit within the range, there is an effect that the entire surface of the curved surface can be focused.

According to the twelfth aspect of the invention, since the light amount is limited based on the subject distance calculated from the plurality of distance measuring areas, the subject distance range is wider than the depth of field. Even in the range, the depth of field can be deepened by narrowing the aperture, and even in the case of a film with a large warp, the entire subject can be focused. In addition, even if the page is warped when a thick book is opened for shooting, there is an effect that the entire page can be focused in the same manner.

[Brief description of drawings]

FIG. 1 is a block diagram of an electronic camera showing an embodiment of the present invention.

FIG. 2 is a flowchart showing a basic operation of the electronic camera showing the embodiment of the present invention.

FIG. 3 is a flowchart showing a reset operation of the focus lens in FIG.

FIG. 4 is a flowchart showing an image recording operation in FIG.

FIG. 5 is an explanatory diagram illustrating a distance measurement area in a normal shooting mode.

FIG. 6 is an explanatory diagram showing a distance measuring area in the film adapter mode in the first embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a relationship between a position of a photo interrupter and an output.

FIG. 8 is an explanatory diagram showing a correspondence between a warped film and a distance measuring area.

FIG. 9 is an explanatory diagram illustrating a relationship between a warped film and a depth of field.

FIG. 10 is an explanatory diagram showing another example of a distance measuring area in the film adapter mode in the first embodiment.

FIG. 11 is an explanatory diagram showing a distance measuring area in the film adapter mode in the second embodiment of the present invention.

FIG. 12 is a flowchart showing a basic operation of the electronic camera of the second embodiment.

FIG. 13 is a flowchart showing an AF operation in the second embodiment.

FIG. 14 is an explanatory diagram showing a correspondence between a warped film and a distance measuring area in the second embodiment.

FIG. 15 is an explanatory diagram showing another example of the distance measuring area in the film adapter mode in the second embodiment.

FIG. 16 is a flowchart showing an AF operation in the third embodiment.

FIG. 17 is an explanatory diagram showing a conventional distance measuring area.

[Explanation of symbols]

 102 Aperture Shutter 105 Focus Lens 107 Motor 108 Focus Lens Drive Circuit 109 Image Sensor 115 Control Unit

Claims (18)

[Claims] 1. A focus lens for adjusting the focus of a subject image, a focus lens driving means for driving the focus lens, a photoelectric conversion means for converting the subject image formed by the focus lens into an electric signal, Extraction means for extracting a signal indicating a high-frequency component of the brightness of the subject from the signal of a predetermined portion of the output signal of the photoelectric conversion means, mode setting means for setting the operation mode, and the mode setting means for setting the predetermined operation mode. The automatic focusing device is provided with a control means for controlling the focus lens driving means according to the signal extracted by the extracting means. 2. The automatic focusing device according to claim 1, wherein the predetermined operation mode is a mode for photographing a subject having a predetermined shape. 3. The automatic focusing device according to claim 2, wherein the subject having the predetermined shape is a subject having a curved surface. 4. The automatic focusing device according to claim 1, wherein the output signal of the predetermined portion is a signal output from a predetermined area on the conversion surface of the photoelectric conversion means. 5. A focus lens for adjusting the focus of a subject image, a focus lens driving unit for driving the focus lens, a photoelectric conversion unit for converting the subject image formed by the focus lens into an electric signal, Extraction means for extracting a plurality of signals indicating high frequency components of the luminance of the subject from a plurality of parts of the output signal of the photoelectric conversion means, mode setting means for setting an operation mode, and the mode setting means for setting a predetermined operation mode. The automatic focusing device is provided with a control means for performing a predetermined process on the basis of the plurality of signals extracted by the extraction means and controlling the focus lens driving means in accordance with the result of the processing. 6. The automatic focusing device according to claim 5, wherein the predetermined operation mode is a mode for photographing a subject having a predetermined shape. 7. The automatic focusing device according to claim 6, wherein the subject having the predetermined shape is a subject having a curved surface. 8. The automatic focusing device according to claim 5, wherein the signals of the plurality of predetermined portions are signals output from a plurality of predetermined areas on the conversion surface of the photoelectric conversion means. 9. The method according to claim 8, wherein one of the plurality of predetermined areas is located at a center of the conversion surface and at least another one is located at a peripheral portion of the conversion surface. Automatic focusing device. 10. The automatic focusing apparatus according to claim 5, wherein the predetermined process is to calculate a plurality of subject distance ranges corresponding to the plurality of extracted signals. 11. The control means controls the focus lens driving means so that the entire surface of the subject falls within the depth of field based on the calculated plurality of subject distances. The described automatic focusing device. 12. A focus lens for adjusting the focus of a subject image, a photoelectric conversion means for converting the subject image formed by the focus lens into an electric signal, and an output signal of a plurality of parts of the photoelectric conversion means Extraction means for extracting a plurality of signals indicating high-frequency components of luminance, mode setting means for setting an operation mode, light amount limiting means for limiting incident light from the subject, and light amount limiting member for driving the light amount limiting means. When the drive means and the mode setting means set a predetermined operation mode, predetermined processing is performed based on the plurality of signals extracted by the extraction means, and the light amount limiting member drive means is performed according to the result of the processing. And an automatic focusing device having a control means for controlling. 13. The predetermined mode is a mode for photographing a subject having a predetermined shape.
2. The automatic focusing device described in 2. 14. The automatic focusing apparatus according to claim 13, wherein the subject having the predetermined shape is a subject having a curved surface. 15. The automatic focusing apparatus according to claim 12, wherein the signals of the plurality of predetermined portions are signals output from a plurality of predetermined areas on the conversion surface of the photoelectric conversion means. 16. The one of the plurality of predetermined areas is located in the center of the conversion surface, and the other at least one is located in the peripheral portion of the conversion surface.
5. The automatic focusing device described in 5. 17. The automatic focusing apparatus according to claim 12, wherein the predetermined process is to calculate a plurality of subject distance ranges corresponding to the plurality of extracted signals. 18. The control means controls the light amount limiting member drive means so that the entire surface of the subject falls within the depth of field based on the calculated plurality of subject distances. The automatic focusing device according to item 17.