JPH09152654A - Camera provided with focus detection function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a photographer to clearly recognize the distinction between the time when a focus detection is started and the time when a focusing state is obtained even when the processing time to detect the focus is short. SOLUTION: This camera is provided with focus detection area display means 21, 100 and 106 for performing the display of the selected focus detection area in a 1st display form during a photographic lens is moved to the focusing position, and for performing the display of the selected forcus detection area in a 2nd display form when the photographic lens reaches the focusing position. The display form of the selected focus detection area when the photographic lens is moved to the focusing state is made differ from that when the photographic lens reaches the focused state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focus detection function provided with focus detection area display means for displaying positions corresponding to a plurality of focus detection areas and notifying which portion of the screen is in focus. It relates to the improvement of the attached camera.

[0002]

2. Description of the Related Art Conventionally, various automatic focus detection devices have been proposed which have a plurality of focus detection areas within a photographing range and select an arbitrary focus detection area to perform focus detection.

For example, an automatic focus detection apparatus using a passive method (basic method) that uses natural light of a subject performs distance measurement in a plurality of focus detection areas, and the photographer's intention based on the distance measurement results of the plurality of points. One focus detection area to be selected is estimated and selected. Then, the focus state of the photographing lens is controlled based on this distance measurement information.

On the other hand, in a single-lens reflex camera or the like, there are many uses for pursuing the drawing in accordance with the intention of the photographer by the advanced photographing technique. In such a case, it is preferable to directly select the focus detection area by the photographer's will, rather than relying on automatic means incorporated in the camera to select the focus detection area. For example, when the camera is fixed to a tripod and operated, the AF lock technique cannot be used, so focus detection area control by the photographer's intention is extremely effective.

Further, since it is difficult to automatically discriminate between the two compositions even if there is an obstacle near the main subject, it is preferable to select the photographer's intention.

As described above, the method of selecting one focus detection area actually used for controlling the lens from the distance information of a plurality of focus detection areas is, as described above, the "automatic selection mode" automatically determined by the camera and the photographing. There are two "optional modes" depending on the will of the person.

Display means corresponding to each focus detection area is provided so that the focus detection area selected by the arbitrary selection mode or the focus detection area selected by the automatic selection mode can be displayed on the finder for confirmation. Various types of automatic focus detection devices based on the multiple distance measurement method have been proposed.

In this type of function, the meaning of the focus detection area to be displayed differs between the automatic selection mode and the arbitrary selection mode.

That is, in the manual selection mode, the focus detection area selected by the photographer is displayed, but in the automatic selection mode, the selected focus detection area and the focus detection area within the focus detection area are displayed. The focus detection area at is also displayed.

Further, in this type of function, the display timing differs depending on the focus detection operation. In the focus detection operation, focus detection is performed until focusing is achieved, and focus detection is not performed after the taking lens reaches the in-focus position.
Operation ”and“ servo AF operation ”for repeatedly performing the focus detection result regardless of the focus detection result.

The actual display method will be described below.

<One-shot AF operation> In the arbitrary selection mode, the selected focus detection area is displayed for a certain period of time when the focus detection operation is started and when the focus is reached.
In the automatic selection mode, the focus detection area is not displayed when starting the focus detection operation, and when the focus is reached, the selected focus detection area and the focus detection area within the focus range are displayed for a certain period of time. .

<Case of Servo AF Operation> In the arbitrary selection mode, the selected focus detection area is displayed for a certain time when the focus detection operation is started. In the automatic selection mode, the selected focus detection area is not displayed.

[0014]

The above-mentioned conventional example has the following problems.

1) In the one-shot AF operation, in the case of the arbitrary selection mode, if the processing time for focus detection is short, the display at the start of focus detection and the display at the time of focusing can be seen almost at the same time, and they can be distinguished from each other. Not stick.

2) In the one-shot AF operation, in the case of the automatic selection mode, the focus detection area selected at the time of focusing and the focus detection area within the focusing range are lit at the same time. Therefore, for example, when the main subject and the background are close to each other, both the main subject and the background may be in focus. In such a case, if the selected focus detection area and the focus detection area within the focus range are lit at the same time,
It is sometimes difficult for the photographer to confirm where the focus detection area actually selected is.

3) In the servo AF operation, in the automatic selection mode, since the selected focus detection area is not displayed at all, the photographer cannot confirm the selected focus detection area.

(Object of the Invention) A first object of the present invention is to clearly distinguish between the start of focus detection and the fact that an in-focus state is reached, even if the processing time for focus detection is short. It is to provide a camera with a focus detection function that can be recognized by the user.

A second object of the present invention is to achieve the above-mentioned first object, and to allow the photographer to clearly recognize the distinction between the actually selected focus detection area and the focus detection area within the in-focus range. It is an object of the present invention to provide a camera with a focus detection function that can be performed.

[0020]

In order to achieve the first object, the present invention according to claim 1 displays a selected focus detection area during control for moving a taking lens to a focus position. Is performed in the first display mode, and when the photographic lens reaches the in-focus position, focus detection area display means for displaying the selected focus detection area in the second display mode is provided, and the photographic lens is The display form of the selected focus detection area is made different when the focus state is moved and when the focus state is reached.

In order to achieve the second object, the present invention according to claim 2 displays the selected focus detection area in the first display mode during the control of moving the taking lens to the in-focus position. When the photographing lens reaches the in-focus position, the selected focus detection area and the focus detection area within the focus area with respect to the focus detection area are displayed in the second display form. Focus detection area display means is provided, and when the photographing lens is moving to the focused state and when the focused state is reached,
The display form of the selected focus detection area is made different, and when the focus state is reached, the focus detection area within the focus range with respect to the selected focus detection area is also specified. ing.

Similarly, in order to achieve the second object,
According to a third aspect of the present invention, during the control of moving the taking lens to the in-focus position, the selected focus detection area is displayed in the first display form, and when the taking lens reaches the in-focus position. Area display means for displaying the selected focus detection area in the second display mode and displaying the focus detection area within the focus range with respect to the focus detection area in the third display mode. Is provided, the display mode of the selected focus detection area is made different when the photographing lens is moving to the in-focus state and when the in-focus state is reached, and when the in-focus state is reached. The focus detection area within the in-focus range with respect to the selected focus detection area is also displayed in a different display form.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on the illustrated embodiments.

FIG. 1 is a block diagram showing the essential parts of the first embodiment when the present invention is applied to a single-lens reflex camera, and FIGS. 2A and 2B show the single-lens reflex camera of FIG. FIG. 3 is a view showing the upper surface and the back surface, and FIG. 3 is an explanatory view in the viewfinder field of FIG.

In FIG. 1, reference numeral 1 denotes a taking lens, which is shown as two lenses for convenience, but in reality it is composed of more lenses. Reference numeral 2 denotes a main mirror, which is obliquely installed or retreated in the optical path of the photographing depending on the observing state of the subject by the finder system and the photographing state of the subject image. 3 is a submirror,
The light beam that has passed through the main mirror 2 is reflected toward a focus detection device 6 described below below the camera body.

Reference numeral 4 is a shutter, and 5 is a photosensitive member such as a silver salt film. A focus detection device 6 includes a field lens 6a, reflection mirrors 6b and 6 arranged near the image plane.
c, secondary imaging lens 6d, diaphragm 6e, line sensor 6f
And so on.

The focus detection device 6 in this embodiment uses a well-known phase difference method, and as shown in FIG. 3, a plurality of regions (5 places) in the observation screen (in the viewfinder field) are used as focus detection regions. The focus detection area is configured to be capable of focus detection.

Reference numeral 7 is a focusing plate arranged on the planned image forming surface of the taking lens 1, and 8 is a pentaprism for changing the finder optical path. Reference numerals 9 and 10 respectively denote an imaging lens and a photometric sensor for measuring the brightness of the subject within the observation screen, and the imaging lens 9 conjugates the focusing plate 7 and the photometric sensor 10 via the reflection optical path in the pentaprism 8. Have a relationship. Reference numeral 11 denotes an eyepiece lens arranged behind the exit surface of the pentaprism 8 and used for observing the focusing plate 7 by the eye 15 of the photographer.

Reference numeral 21 is a high-intensity superimposing LED that can be visually recognized even in a bright subject. The light projected from this LED is reflected by the main mirror 2 via the projection prism 22 and is provided on the display portion of the focusing plate 7. Micro prism array 7
It is bent in the vertical direction at a and reaches the photographer's eye 15 through the pentaprism 8 and the eyepiece lens 11.

Therefore, the micro prism arrays 7a are formed in a frame shape at a plurality of positions corresponding to the focus detection area of the focusing plate 7, and five superimposing LEDs 21 (each of which is LED-L1, respectively) are formed. LED-L2, LE
D-C, LED-R1, and LED-R2), so that each focus detection area mark 200, 201, 201, 201, 201, 201, 201, 201, 201, 201
Numerals 202, 203, and 204 illuminate in the field of view of the finder to display the focus detection area (hereinafter, this is referred to as superimpose display).

Reference numeral 23 is a field mask for forming a finder field area, and 24 is an LCD in the finder for displaying photographing information outside the field of the finder, which is an illumination LED (F-LE).
D) Illuminated by 25.

The light transmitted through the LCD 24 is guided by the triangular prism 26 into the field of view of the finder, and the light shown in FIG.
As indicated by 07, the image is displayed outside the viewfinder field so that the photographer can know the photographing information.

Reference numeral 31 denotes an aperture provided in the taking lens 1, 32
Is a diaphragm driving device including a diaphragm driving circuit 111 described later, 3
Reference numeral 3 is a lens driving motor, and 34 is a lens driving member including a driving gear and the like. Reference numeral 35 denotes a photocoupler that detects the rotation of the pulse plate 36 that is interlocked with the lens driving member 34 and transmits it to the lens focus adjustment circuit 110. The focus adjustment circuit 110, which will be described later, uses this information and the lens drive amount information from the camera side. Based on this, the lens driving motor 33 is driven by a predetermined amount to move the taking lens 1 to the in-focus position. Reference numeral 37 denotes a mounting contact that serves as an interface between a known camera and a lens.

In FIGS. 2A and 2B, reference numeral 41 is a release button. Reference numeral 42 denotes a monitor LCD as an external monitor display device, which comprises a fixed segment display portion 42a for displaying a predetermined pattern and a 7-segment display portion 42b for displaying variable numerical values. Reference numeral 43 is an AE lock button for holding a photometric value, and 44 is a mode dial for selecting a shooting mode or the like. Reference numeral 45 is an electronic dial, and 55 is an index of the mode dial 44. Reference numeral 90 denotes a focus detection area selection button which is used to set the camera to the focus detection area setting state when changing the focus detection area, and 91 is used to set the camera to the AF mode setting state when changing the AF mode. It is an AF mode button. The other operating members are not particularly necessary for understanding the present invention, and will be omitted.

FIGS. 4A and 4B are views showing the details of the mode dial 44, and the photographing mode is set by the display contents by matching the display with the index 55 imprinted on the camera body. .

In FIG. 4A, reference numeral 44a denotes a lock position for making the camera inoperative, and reference numeral 44b denotes an automatic shooting mode position controlled by a shooting program preset by the camera. Reference numeral 44c is a manual photographing mode in which the photographer can set the photographing contents, and includes program AE, shutter priority AE, aperture priority AE, subject depth priority AE,
Has each shooting mode of manual exposure.

FIG. 4B shows the internal structure of the mode dial 44, and 46 is a flexible printed circuit board, showing switch patterns (M1, M2, M3, M4) and GND patterns as mode dial switches. Are arranged as described above, and the four contact pieces (47a, 47a, of the switch contact piece 47 which are interlocked with the rotation of the mode dial 44).
47b, 47c, 47d) by sliding
The 12 positions shown on the mode dial 44 can be set by 4 bits.

An electronic dial 45 is for selecting a set value that can be further selected from the modes selected by the mode dial 44 by rotating and generating a click pulse. For example, if the shutter priority shooting mode is set with the mode dial 44, the viewfinder L
The currently set shutter speed is displayed on the CD 24 and the monitor LCD 42. When the photographer rotates the electronic dial 45, the shutter speed is sequentially changed from the currently set shutter speed according to the rotating direction.

FIG. 5A is a schematic view showing the internal structure of the electronic dial 45, in which a click plate 48 rotating with the dial 45 is arranged, and a printed circuit board 49 is fixed thereto. .

Switch patterns 49a (SWDIAL-1), 49b (SWDIAL-2) and GND pattern 49c are arranged on the printed circuit board 49 as shown in the drawing, and three sliding contact pieces 50a, 50b, Switch contact 50 with 50c
Are fixed to the fixing member 51.

Reference numeral 52 denotes a click ball fitted in a recess 48a formed on the outer peripheral portion of the click plate 48, and a coil spring 53 for urging the click ball 52 is held by the fixing member 51. Further, in the normal position (the state where the click ball 52 fits in the recess 48a), the sliding contact pieces 50a, 50b are not in contact with either of the switch patterns 49a, 49b.

The electronic dial 4 formed in this way
5, the photographer sets the electronic dial 45 to the position shown in FIG.
When it is rotated clockwise at, the sliding contact piece 50b
Touches the switch pattern 49b first, and then the sliding contact piece 50a contacts the switch pattern 49a, and counts up at this timing. In the case of counterclockwise rotation, the relationship between the sliding contact piece and the switch pattern is just the opposite, and the set value is counted down at the same timing.

FIG. 5B is a timing chart showing the state at the time of this operation, and shows the pulse signals generated in the switch patterns 49a and 49b when the electronic dial 45 is rotated and the timing thereof.

The upper part of FIG. 5 (B) shows the case of one-click rotation in the clockwise direction, and the lower part shows the case of the counterclockwise rotation. In this way, the count-up / down timing and rotation direction are shown. Is being detected.

FIG. 6 is a block diagram showing an electrical structure incorporated in the single-lens reflex camera having the above-mentioned structure, and the same parts as those in the above respective drawings are denoted by the same reference numerals.

A central processing unit (hereinafter referred to as a CPU) 100 in a microcomputer incorporated in the camera body includes a photometric circuit 102, an automatic focus detection circuit 103, a signal input circuit 104, an LCD drive circuit 105, and an LED drive circuit 10.
6, a shutter control circuit 108 and a motor control circuit 109 are connected. Further, signals are transmitted between the focus adjustment circuit 110 and the diaphragm drive circuit 111 arranged in the photographing lens 1 through the mount contact 37 shown in FIG.

The photometric circuit 102 amplifies the output from the photometric sensor 10, performs logarithmic compression and A / D conversion, and outputs it to the CPU 100 as luminance information of each sensor.

The photometric sensor 10 includes an SPC-L for photometrically measuring a left area 210 including the left focus detecting areas 200 and 201 in the finder field shown in FIG. 3, and a central area 211 including a central focus detecting area 202. SPC-C for photometry
And the SPC-R for photometrically measuring the right area 212 including the right focus detection areas 203 and 204, and the peripheral area 21 of these areas.
SPC-A for photometry of 3 and a photodiode for photometry of four areas.

The line sensor 6f shown in FIG. 6 has five focus detection areas 200 to 204 in the screen as shown in FIG.
Sets of line sensors CCD-L2, CCD-
L1, CCD-C, CCD-C, CCD-R1, CCD
It is a known CCD line sensor composed of -R2.

The automatic focus detection circuit 103 A / D-converts the voltage obtained from the line sensor 6f, and the CPU 1
It has a function to send to 00.

SW1 is turned on by the first stroke of the release button 41, and is a switch for starting photometry, AF, etc., S
W2 is a release switch that is turned on by the second stroke of the release button, and SW-AEL is an AE lock switch that is turned on by pressing the AE lock button 43. SW-D
IAL1 and SW-DIAL2 are dial switches provided in the electronic dial 45 already described. The signal generated here is input to the up / down counter of the signal input circuit 104, and the amount of rotation click of the electronic dial 45 is counted. .

SW-M1 to SW-M4 are also dial switches provided in the mode tire 44 already described.
The signals generated in these switches are input to the signal input circuit 104 and transmitted to the CPU 100 via the data bus.

The LCD drive circuit 105 is for driving the in-viewfinder LCD 24 and the monitor LCD 42, and displays the aperture value, shutter speed, set photographing mode, etc. according to a signal from the CPU 100.
Displayed on both 4 and 42 simultaneously.

The LED driving circuit 106 is a lighting LE.
D25 and the superimposing LED 21 are turned on and blinked, and a circuit unit for driving these LEDs at a constant current is provided. This constant current driving circuit unit is used for the illumination LED 2
5 and LED 21 for superimposing are independent. The current value of the LED 25 for lighting is fixed, but that of the LED 21 for superimposing is 0 m.
It is possible to select from A, 5 mA, and 40 mA. This current value can be set by the CPU 100 as a current value for driving the superimposing LED 21, and the brightness can be controlled by this.

The shutter control circuit 108 controls the magnet MG-1 that runs the front curtain and the magnet MG-2 that runs the rear curtain when energized to expose the photosensitive member with a predetermined amount of light. The motor control circuit 109
Is a motor M1 for winding and rewinding the film, a main mirror 2 and a motor M2 for charging the shutter 4.
Is to control the These shutter control circuit 108 and motor control circuit 109 operate a series of release sequences.

FIGS. 7A and 7B show the monitor LCD 4
2 and the contents of all display segments of the LCD 24 in the finder.

In FIG. 7A, the fixed display segment portion 42a is provided with a known photographing mode display and the like. The 7-segment part 42b for displaying variable numerical values includes a 4-digit 7-segment 62 for displaying shutter speed, a 2-digit 7-segment 63 for displaying aperture value, a decimal point display part 64, and a limited numerical-value displaying segment for displaying the number of films. 65, 1 digit 7
It is composed of segments 66.

In FIG. 7B, reference numeral 71 is a camera shake warning mark, 72 is an AE lock mark, 73, 74 and 75 are display segments for both the shutter time display and the aperture value display, and 76 is an exposure correction setting. A mark, 77 is a strobe-filling mark, and 79 is a focusing mark indicating the focusing state of the taking lens.

Next, the operation of the single-lens reflex camera will be described with reference to the flow charts of FIGS.

When the mode dial 44 is rotated to set the camera from the inoperative state to the predetermined photographing mode (this embodiment will be described based on the case where the shutter display priority mode is set), the power of the camera is turned off. When turned on (step # 100), the CPU 100 starts the operation from step # 102. [Step # 101] Flags required for camera control,
Initialize variables and so on. This includes clearing the flag indicating that the shutter is being released (release flag). [Step # 102] Information on the operating member is input from the signal input circuit 104. Here, the variable of the switch SW1 is also detected. The result of the detection of the change of the switch SW1 is held until the next step # 102 is executed. [Step # 103] The state of the focus detection area selection button 90 is determined, and if the focus detection area selection button 90 is pressed, the process proceeds to step # 104. [Step # 104] The subroutine "focus detection area setting" is called.

This subroutine "focus detection area setting"
Is to set the focus detection area as "arbitrary selection" input by the photographer or as "automatic selection" in which the camera automatically sets the focus detection area.

In the case of "arbitrary selection", any one of the five focus detection areas is determined.

First, the currently set focus detection area is displayed. By operating the electronic dial 45 in this state, focus detection area automatic selection, focus detection area corresponding to the focus detection area mark 200 (hereinafter referred to as left focus detection area), and focus detection corresponding to the focus detection area mark 201 are detected. A region (hereinafter, referred to as a left middle focus detection region), a focus detection region corresponding to the focus detection region mark 202 (hereinafter referred to as a central focus detection region), a focus detection region corresponding to the focus detection region mark 203 (hereinafter, a right middle focus) Either a detection area) or a focus detection area corresponding to the focus detection area mark 204 (hereinafter referred to as a right focus detection area) can be selected. When the setting is completed, the focus detection area selection button 90 may be pressed again.

When the focus detection area selection button 90 is not pressed in the above step # 103, or when the subroutine "setting of focus detection area" in the above step # 104 is completed, the process proceeds to step # 105. [Step # 105] The state of the AF mode button 91 is determined, and if the AF mode button 91 is pressed, step # 1
Go to 05. [Step # 106] The subroutine "setting of AF mode" is called.

This subroutine "AF mode setting"
Is for setting one-shot AF or servo AF.

First, the currently set AF mode is displayed. By operating the electronic dial 45 in this state, either one-shot AF or servo AF can be selected. When the setting is completed, the AF mode button 91 may be pressed again.

When the AF mode button 91 is not pressed in step # 105, or when the subroutine "setting of AF mode" in step # 106 is completed, the process proceeds to step # 107. [Step # 107] It is determined whether the first stroke of the release button 41 is made and the switch SW1 is turned on. If the switch SW1 remains off, the process returns to step # 102 to check the focus detection area selection button 90 and the AF mode button 91 again and wait until the switch SW1 is turned on.

When it is determined that the switch SW1 is turned on, the process proceeds from step # 107 to step # 108. [Step # 108] The subroutine "photometry" is called.

In the subroutine "photometry", the photometry calculation is performed by weighting the selected focus detection area. When step # 108 is executed, focus detection may not yet be performed, but at this time, the photometric calculation is performed by weighting the central focus detection area. The details of this subroutine "photometry" will be described later. [Step # 109] It is determined whether or not the state of the switch SW1 held in the above step # 102 is a change from off to on, and if so, step # 1
10. If not, proceed to step # 111. [Step # 110] Here, since the switch SW1 is changed from OFF to ON, the first focus detection operation is performed. Therefore, a flag related to distance measurement is initialized before the distance measurement operation is started. [Step # 111] A subroutine "focus detection" is called in order to detect the focus states of a plurality of focus detection areas. By calling this subroutine "focus detection", the defocus amount of each focus detection area is obtained.

After the operation of step # 111 is completed, the process proceeds to step # 112 of FIG. [Step # 112] The subroutine "focus detection area selection" is called.

In this subroutine "focus detection area selection", the main subject is estimated based on the defocus amounts of the plurality of focus detection areas obtained by the subroutine "focus detection" executed in step # 111, Processing for determining the focus detection area is performed. The defocus amount of the focus detection region obtained by this subroutine "focus detection region selection" becomes the defocus amount actually used for lens control. [Step # 113] The subroutine "focus determination" is called.

In this subroutine "focus determination", the current focus state is focused based on the defocus amount of the focus detection area obtained by the subroutine "focus detection area selection" executed in step # 112. It is determined whether or not, whether or not it is within the in-focus range, and whether or not distance measurement is impossible. The result of this determination is used for control and display for driving the lens. [Step # 114] One-shot AF or servo AF
Is determined. If it is one-shot AF, the process proceeds to step # 115, and if it is servo AF, step # 120.
Proceed to.

Here, it is assumed that the one-shot AF is selected and the process proceeds to step # 115. [Step # 115] It is determined whether or not distance measurement is impossible. If distance measurement is possible, the process proceeds to step # 116. [Step # 116] Since distance measurement is possible, if the focus state of the focus detection area selected in step # 112 is in focus, step # 118 is performed to perform focus display.
If it is not in focus, the process proceeds to step # 119 to drive the lens.

If it is determined in step # 115 that distance measurement is impossible, the process proceeds to step # 117 to display that distance measurement is impossible. [Step # 117] The CPU 100 sends a signal to the LCD drive circuit 105 to blink the focus mark on the in-finder LCD 24 to notify the photographer that distance measurement is impossible.

In step # 116, if the focus state of the selected focus detection area is in focus, the process proceeds to step # 118 to display the focus as described above. [Step # 118] The CPU 100 sends a signal to the LCD drive circuit 105 to turn on the focusing mark 79 of the in-viewfinder LCD 24 to notify the photographer that focusing has been achieved.

In step # 116, if the focus state of the selected focus detection area is not in focus, the process proceeds to step # 119 to drive the lens as described above. [Step # 119] The CPU 100 sends a signal to the focus adjustment circuit 110 to drive the taking lens 1 by a predetermined amount.

If it is determined in step # 114 that the AF is not the one-shot AF, that is, the servo AF, the process proceeds to step # 120 as described above. [Step # 120] Since it is the servo AF, if the focus state of the focus detection area selected in step # 112 is within the focusing range, the lens is not driven and step # 122 is performed.
If it is not within the in-focus range, the process proceeds to step # 121 to drive the lens. [Step # 121] The CPU 100 sends a signal to the lens focus adjustment circuit 110 to drive the taking lens 1 by a predetermined amount.

Steps # 117, # 118, # 11
9 or when the operation of step # 121 ends,
In either case, the process proceeds to step # 122. [Step # 122] The subroutine "focus detection area display 1" is called.

This subroutine "focus detection area display 1"
Then, the focus detection area is displayed except during the release control. Details of this subroutine "focus detection area display 1" will be described later.

After the operation of step # 122 is completed, the process proceeds to step # 123 and subsequent steps in FIG. Steps below #
123, # 124, and # 125 perform processing for determining whether or not to perform the release sequence. That is,
The second stroke of the release button 41 is made and the switch S
One shot A as well as whether W2 is on or not
At the time of F, the release cannot be performed unless the focus is achieved, so the focus determination is also performed. [Step # 123] Here, it is determined whether the one-shot AF or the servo AF. Then, in the case of one-shot AF, the process proceeds to step # 124 to also perform the focus determination, and in servo AF, the focus determination is not necessary, so the process proceeds to step # 125. [Step # 124] During the one-shot AF, the release cannot be performed unless the focus is achieved. Therefore, if the focus is achieved, the process proceeds to step # 125, and if the focus is not achieved, the process returns to step # 102 in FIG. [Step # 125] It is determined whether or not the switch SW1 is on. If it is off, the process returns to step # 102, and if it remains on, the process proceeds to step # 126. [Step # 126] It is determined whether or not the switch SW2 is on. If it is on, the process proceeds to step # 127, and if the switch SW2 remains off, the step # 1 is performed.
Return to 02. [Step # 127] The shutter control circuit 108 and the motor control circuit 109 are driven to execute a series of release sequences. Details will be described below.

Next, the above-mentioned release sequence will be described with reference to the flow charts of FIGS. 11 to 13. [Step # 200] The release sequence is started. [Step # 201] As a preparation for exposing the film 5 to light, first, the main mirror 2 is raised. Therefore, the CPU 100 sends a signal to the motor control circuit 109 to start driving the motor M2. [Step # 202] A rush current flows when energization of the motor M2 is started. In order to prevent the drive of the aperture 31 performed in the next step # 203 from overlapping with this rush current, the aperture 31 is started from the start of energization of the motor M2 here.
Wait 10 ms before starting driving. [Step # 203] A signal is sent to the diaphragm driving device 32 including the diaphragm driving circuit 11 to narrow down the diaphragm 31 by a predetermined amount. [Step # 204] Phase signal CM of the phase board (not shown)
Continue to monitor SP1 and CMSP2 and wait until the phase signal reaches the mirror up position. [Step # 205] Since the mirror-up position is reached here, a signal is sent to the motor control circuit 109 to stop energizing the motor M2. [Step # 206] Wait until the diaphragm 31 narrows down by a predetermined amount. [Step # 207] Here, shutter control is performed.

Specifically, first, the shutter control circuit 108
Signal to the magnet MG1 to energize the shutter 4
Open the first curtain of. The aperture value of the aperture 31 and the shutter speed of the shutter 4 are determined from the exposure value detected by the photometric circuit 102 and the sensitivity of the film 5. After a lapse of a predetermined shutter time, a signal is sent to the shutter control circuit 108, the magnet MG2 is energized, and the rear curtain of the shutter 4 is closed. This completes the exposure of the film 5. [Step # 208] When the exposure of the film 5 is completed, the film 5 is wound, the mirror is down, and the shutter is charged.

The film 5 is wound up by the motor M1, and the mirror down and the shutter charge are carried out by the motor M2.
Done by The winding of the film 5 is controlled by monitoring the signals FILM1 and FILM2 of the phase substrate (not shown) and driving the motor M1 until the winding completion position is reached. Further, control of mirror down and shutter charge is performed by monitoring the signals CMSP1 and CMSP2 of the phase substrate (not shown) and driving the motor M2 until the shutter charge completion position is reached.

These controls are actually performed by using interrupt processing. This interrupt occurs every 1ms, and 1ms
The above-mentioned processing is performed every time. Details will be described later.

In step # 208, preparations for starting the interrupt, that is, permitting the interrupt and setting a timer (1 ms) for generating the interrupt are performed. In step # 208, mirror down and shutter charge are performed by reenergizing the motor M2. For this reason, a signal is sent to the motor control circuit 109 to energize the motor M2 and to initialize the control flag related to shutter charge and to set the flag during shutter charge to 1 which is used in the interrupt processing generated every 1 ms described above. And so on.

When the operation in step # 208 is completed, the process proceeds to step # 209 in FIG. [Step # 209] A rush current flows when energization of the motor M2 is started. In order not to overlap the rush current and the energization of the motor M1 for winding the film 5 in the next step # 210, a waiting time of 10 ms is taken from the start of energization of the motor M2 to the start of driving the motor M1. [Step # 210] The film M is wound by the motor M.
This is done by driving 1. For this reason, a signal is sent to the motor control circuit 109 to energize the motor M1, and the initialization of the control flag related to film winding used in the interrupt processing generated every 1 ms described above and the film winding flag set to 1 are set. And so on. [Step # 211] When the motor M1 is energized, a rush current flows. In order to prevent the rush current and the driving of the diaphragm 31 performed in the next step # 212 from overlapping, 10 ms is waited from the start of energization of the motor M1 to the driving of the diaphragm 31. [Step # 212] A signal is sent to the diaphragm driving device 32 including the diaphragm driving circuit 111 to start driving the diaphragm 31. This is to return the diaphragm to the open position. [Step # 213] The shutter charging flag is 0.
Until, that is, until the shutter charge is completed.

When the shutter charge is completed, the main mirror 2 is brought into the down state. [Step # 214] Wait until the aperture 31 returns to the open position.

When the shutter charge is completed (the main mirror 2 is also in the down state) and the diaphragm 31 is in the open state, the metering and AF are possible. [Step # 215] It is determined whether or not it is the servo AF. If it is the one-shot AF, the distance measurement is not performed during the continuous shooting, so the process proceeds to step # 222 in FIG. Further, in the case of servo AF, the distance is measured even during continuous shooting, so the process proceeds to the next step # 216. [Step # 216] In servo AF, a subroutine "focus detection" is called because distance measurement is performed even during continuous shooting.

By calling this subroutine "focus detection", the defocus amount of each focus detection area is obtained. [Step # 217] The subroutine "focus detection area selection" is called.

In this subroutine "focus detection area selection", the main subject is estimated based on the defocus amounts of the plurality of focus detection areas obtained by the subroutine "focus detection" executed in step # 216, Processing for determining the focus detection area is performed. The defocus amount of the focus detection region obtained by this subroutine "focus detection region selection" becomes the defocus amount actually used for lens control.

When the operation in step # 217 is completed, the process proceeds to step # 218 in FIG. [Step # 218] The subroutine "focus determination" is called.

In this subroutine "focus determination", based on the defocus amount of the focus detection area obtained by the subroutine "focus detection area selection" executed in step # 217, the current focus state is in focus. It is determined whether or not, whether or not it is within the in-focus range, and whether or not distance measurement is impossible. This determination result is used for control, display, etc. for driving the lens. [Step # 219] The subroutine "focus detection area display 2" is called.

This subroutine "focus detection area display 2"
Is for notifying the photographer of the currently selected focus detection area even during continuous shooting. The details of this subroutine "focus detection area display 2" will be described later. [Step # 220] It is determined whether or not the focus state of the focus detection area obtained in step # 217 is within the in-focus range, and if it is within the in-focus range, the process proceeds to step # 222 and must be within the in-focus range. Step # 2 to drive the lens
Proceed to 21. [Step # 221] The CPU 100 sends a signal to the lens focus adjustment circuit 110 to drive the photographic lens 1 by a predetermined amount. [Step # 222] The subroutine "photometry" is called.

The subroutine "photometry" performs photometry calculation with weighting the selected focus detection area. The details of this subroutine "photometry" will be described later. [Step # 223] Wait until the film winding flag becomes 0, that is, until the film 5 is wound by one frame. When the winding of the film 5 is completed, it is determined in step # 224 whether or not the release operation is continued.
Proceed to. [Step # 224] It is determined whether or not the release button 41 is pressed and the switch SW2 is turned on. If the switch SW2 is turned on, the process proceeds to step # 201 of FIG. 11 to continue the release operation. If the switch SW2 is turned off, the release operation is terminated and the process returns to step # 102 in FIG.

Next, the interrupt processing for controlling film winding and shutter charging, which is executed in step # 208, will be described with reference to the flowchart of FIG. [Step # 300] Timer for interrupt generation (1 m
When s) elapses, an interrupt occurs, and step # 301
Start interrupt control from. [Step # 301] In order to generate an interrupt again 1 ms later, the interrupt generation timer (1 ms) is reset. [Step # 302] The shutter charging flag is determined. If the shutter charging is being performed, the process proceeds to step # 303, and if the shutter charging is not being performed, the step # 305.
Proceed to. [Step # 303] Signal CMSP1 of the phase board (not shown)
The CMSP2 is monitored to determine whether the shutter charge is at the completed position. If the shutter charge is not completed yet, the process proceeds to step # 305. If the shutter charge is completed, the process proceeds to step # 304. move on. [Step # 304] Since the shutter charge is completed, a signal is sent to the motor control circuit 109 to stop the motor M2, the shutter charge flag is cleared, and the completion of the shutter charge control is stored. [Step # 305] The film winding flag is determined. If the film is being wound, the process proceeds to step # 306, and if the film is not being wound, the process proceeds to step # 308. [Step # 306] Signal FILM1, of the phase board (not shown)
The FILM2 is monitored to determine whether the winding is completed for one frame, and if the winding is not completed yet, the process proceeds to step # 308. If the winding is completed, the process proceeds to step # 307. move on. [Step # 307] Since the winding of one frame is completed,
A signal is sent to the motor control circuit to stop the motor M1 and the film winding flag is cleared to store that the film winding control is completed. [Step # 308] It is determined whether or not the shutter charge control and the film winding control are both finished. If the control is still in progress, the process proceeds to step # 310, and if the control is finished, the process proceeds to step # 309. [Step # 309] Since the film winding control and the shutter charge control are completed and it is no longer necessary to generate an interrupt, the interrupt is prohibited. [Step # 310] The interrupt process ends.

The operation of the camera having the focus detection function has been described above with reference to the flowcharts and the like.

Next, the subroutine "focus detection" will be described with reference to the flowchart of FIG.

This subroutine "focus detection" carries out processing such as sensor accumulation operation, image signal reading, defocus amount calculation, and the like. [Step # 400] When the subroutine "focus detection" is called, the processing from step # 401 is started. [Step # 401] It is determined whether it is one-shot AF or servo. If it is servo AF, the process proceeds to step # 403, and if it is one-shot AF, the process proceeds to step # 402. [Step # 402] Here, the focus flag is determined,
It is checked whether or not the current focus state of the taking lens 1 is in focus.
As a result, if it is in focus, the process proceeds to step # 410, and if it is not in focus, the process proceeds to step # 403.

By the above steps # 401 and # 402, the one-shot AF is realized, and the focus detection is not executed if the current photographing lens 1 is in focus. [Step # 403] It is determined whether the setting state of the focus detection area is automatic selection of focus detection area or arbitrary selection. If it is arbitrary selection, the process proceeds to step # 404. [Step # 404] Since it is an arbitrary selection, the focus detection area designated by the photographer is set as the calculation focus detection area. Note that the calculation focus detection area is a focus detection area where sensor accumulation control, image signal reading, and defocus amount calculation are performed.

In step # 403, if the focus detection area setting state is the focus detection area automatic selection, the process proceeds to step # 405. [Step # 405] Since the focus detection areas are automatically selected, it is necessary to calculate all the focus detection areas because the camera automatically selects the focus detection areas by estimating the main subject. Therefore, the entire focus detection area is set as the calculation focus detection area. Note that the calculation focus detection area is a focus detection area in which accumulation control of the sensor, reading of an image signal, and calculation of the defocus amount are performed as in the above.

Step # 404 or Step # 40
After the end of the operation of 5, the process proceeds to step # 406. [Step # 406] The accumulation operation of the sensor is started.
Regardless of the calculation focus detection area described above, the accumulation operation is started for all the sensors corresponding to the entire focus detection area. [Step # 407] Wait until all the sensors corresponding to the above-described calculation focus detection area have completed the accumulation operation. [Step # 408] When the accumulation operation of all the sensors in the calculation focus detection area described above is completed, the reading operation of the sensor corresponding to the calculation focus detection area is performed. [Step # 409] When the reading operation of all the sensors in the calculation focus detection area described above is completed, the defocus amount corresponding to the calculation focus detection area is calculated. In this step, it is simultaneously determined whether or not each focus detection area cannot measure the distance. [Step # 410] The subroutine "focus detection" is completed and the process returns.

Next, the subroutine "focus detection area selection"
This will be described with reference to the flowchart of FIG.

This subroutine "focus detection area selection"
Performs a process of estimating the main subject based on the defocus amount of each focus detection area and selecting the focus detection area. [Step # 500] When the subroutine "focus detection area selection" is called, the processing from step # 501 is started. [Step # 501] First, it is determined whether the focus detection area is automatically selected or arbitrarily selected. If the selection is arbitrary, the process proceeds to step # 502 to set the focus detection area set by the photographer as the selected focus detection area. [Step # 502] Since it is an arbitrary selection, the focus detection area set by the photographer is set as the selected focus detection area.

In step # 501, if the focus detection area is automatically selected, the process proceeds to step # 503. At the time of automatic selection of focus detection areas, the main subject is estimated from the defocus amount of each focus detection area.
Execute the following processing. [Step # 503] First, it is determined whether or not there is a focus detection area in which the distance can be measured in the five focus detection areas, and if none of the focus detection areas can be measured, the central focus detection area is selected. The process proceeds to step # 513, and if there is a focus detection area capable of distance measurement, the process proceeds to step # 504. [Step # 504] It is determined whether or not there is one focus detection area capable of distance measurement, and if so, the process proceeds to step # 509 to select that focus detection area. If there are two or more, the process proceeds to step # 505. [Step # 505] It is determined whether or not there is a central focus detection area in the focus detection areas capable of distance measurement, and if there is a central focus detection area, the procedure proceeds to step # 506, and if there is no central focus detection area, the procedure proceeds to step # 507. move on. [Step # 506] It is determined whether or not the central focus detection area is at a short distance (for example, 20 times or less of the focal length). If it is at a short distance, the process proceeds to step # 507, and if it is not at the short distance, the process proceeds to step # 510.

The process proceeds to the following step # 507 when the distance can be measured in the central focus detection area and the distance is short, or when the distance is not measured in the central focus detection area. [Step # 507] Here, it is determined whether the number of short-distance focus detection regions is larger than the number of long-distance focus detection regions. If there is more, it is determined that the main subject is on the photographer side, and the focus of the closest point is determined. Step # 508 to select the detection area
Proceed to. [Step # 508] The closest point is set as the selected focus detection area.

When it is determined in step # 504 that there is only one focus detection area capable of distance measurement, step # 5 is selected in order to select that focus detection area as described above.
Go to 09. [Step # 509] The focus detection area in which distance measurement is possible is set as the selected focus detection area.

If it is determined in step # 506 that the central focus detection area is not at a short distance, the process proceeds to step # 510 as described above. [Step # 510] Here, it is determined whether the number of long-distance focus detection areas is larger than the number of short-distance focus detection areas, and if there is more, it is determined that the subject is on the far-distance side including the central focus detection area. The process proceeds to step # 511 to select the central focus detection area. If the number of long-distance focus detection areas is small, the process proceeds to step # 508 described above in order to select the closest point in the same manner as described above. [Step # 511] The central focus detection area is set as the selected focus detection area.

If it is determined in step # 507 that the number of short-distance focus detection regions is smaller than the number of long-distance focus detection regions, it is determined that the main subject is on the far-distance side, and the depth of field is determined. In consideration of the above, the process proceeds to step # 512 in order to select the closest point in the long-distance focus detection area. [Step # 512] The closest focus detection area in the long-distance focus detection area is set as the selected focus detection area.

If it is determined in step # 503 that all the focus detection areas cannot be measured, the process proceeds to step # 513 to select the central focus detection area. [Step # 513] The central focus detection area is set as the selected focus detection area.

Steps # 502, # 508, # 50
After the operations of 9, # 511, # 512 or step # 513 are completed, the process proceeds to step # 514. [Step # 514] The subroutine "focus detection area selection" is ended, and the process returns to the main routine.

Next, the subroutine "photometry" will be described with reference to the flowchart of FIG.

This subroutine "photometry" measures the brightness of the subject and executes the process of calculating the exposure amount. [Step # 601] First, the brightness information of the subject is obtained from the photometric circuit 102. [Step # 602] The switch SW1 is turned on to determine whether or not it is the first photometry. If the photometry is the first photometry, the focus detection region has not yet been obtained because the focus detection has not been performed at this point. Therefore, the central metering area 21
In order to perform the calculation with the same weighting calculation formula as when 1 is selected, the process proceeds to step # 605, and if it is not the first photometry, the process proceeds to step # 603. [Step # 603] It is determined whether or not all the focus detection areas cannot be measured, and if so, the central photometry area 211
In order to perform the calculation with the same weighting calculation formula as when is selected, the process proceeds to step # 605, and if there is even one focus detection area capable of distance measurement, the process proceeds to step # 604. [Step # 604] It is determined whether or not the central photometric area 211 is selected, and if so, the process proceeds to step # 605 to perform the calculation by the weighting calculation formula S1, and the central photometric area 2 is selected.
If a value other than 11 is selected, the process proceeds to step # 606 to be calculated by the weighting calculation formula S2. [Steps # 605, # 606] If the first photometry, distance measurement impossible, or the central photometry area 211 is selected, the following photometric weighting calculation formula S1 is selected. The following photometric weighting formula S
2 is used to calculate the photometric value.

Here, the photometric weighting arithmetic expressions S1 and S2
Are shown below, where A to D indicate photometric values of A = central photometric region, B = left photometric region, C = right photometric region, and D = peripheral region, respectively.

S1 = (A * 3 + B * 1.5 + C * 1.5 + D * 1) / 7 When left metering area is selected S2 = (B * 3 + A * 1.5 + C * 1 + D * 1) /6.5 Right metering area is selected S2 = (C * 3 + A * 1.5 + B * 1 + D * 1) /6.5 [Step # 607] Exposure calculation is performed based on the photometric value calculated by each weighting formula, and the photometric value and film sensitivity are calculated. The aperture value and the shutter speed are calculated by using this. [Step # 608] The subroutine "photometry" is terminated, and the process returns to the main routine.

Next, the subroutine "focus detection area display 1" according to the present invention will be described with reference to FIGS.

This subroutine "focus detection area display 1"
Displays the focus detection area at the time of focusing and the focus detection area at the start of the distance measurement operation. [Step # 700] When the subroutine "focus detection area display 1" is called, the processing from step # 701 is started. [Step # 701] In step # 102 described above, the change of the switch SW1 is detected.
When it is determined that the change of the switch SW1 is changed from OFF to ON, it can be recognized as the first focus detection operation. Therefore, here it is determined whether or not the current focus is the first focus detection, and if it is the first focus detection, step # 7.
02, otherwise step # 706 in FIG.
Proceed to.

In the following steps # 702 to # 705, the superimpose corresponding to the focus detection area is displayed in order to inform the photographer of which focus detection area is selected in the first focus detection operation. Is a processing part for. [Step # 702] It is determined whether or not the focus detection area is automatically selected. If it is arbitrary selection, the procedure proceeds to step # 704, and if it is automatic selection, the procedure proceeds to step # 703. [Step # 703] One-shot AF or Servo AF
If it is one-shot AF, the superimpose corresponding to the focus detection area is not displayed in this case, and therefore the process proceeds to step # 714 in FIG. 19, and if it is the servo AF, the process proceeds to step # 704. [Step # 704] The current value of the superimpose LED corresponding to the selected focus detection area is set to 5 mA.

As described above, LE for superimpose
The current value of D can be selected between 5 mA and 40 mA. The value is set to 5 mA when the focus detection area of the first focus detection operation is displayed, and is set to 40 mA when the focus detection area when focusing is described later. By changing the current value in this way, it is displayed weakly at the time of the first focus detection operation and strongly displayed at the time of focusing, so that the photographer can be informed separately. This display is based on step # 1 described above.
At twelve. [Step # 705] Here, the superimpose LED corresponding to the selected focus detection area is lit for a time of 50 mS. The lighting time is preferably such that the appearance and operability of the superimpose do not deteriorate, and about 50 ms to 100 ms is an appropriate time. Then, the process proceeds to step # 714 in FIG.

When it is determined in step # 701 that the current focus is not the first focus detection, the process proceeds to step # 706 in FIG. 19 as described above.

The following step # 706 and subsequent steps are the determination and lighting processing part for displaying the focus detection area when focusing. [Step # 706] First, it is determined whether or not it is the one-shot AF. If it is the servo AF, the process proceeds to step # 714 because no display is made. If it is the one-shot AF, the process proceeds to step # 707. [Step # 707] If it is the one-shot AF and the current focus state of the taking lens 1 is not the in-focus state, it is not necessary to display it, so the process proceeds to step # 714. move on. [Step # 708] If the one-shot AF is in focus and the focus detection area is displayed in the in-focus state, the focus detection operation is not performed after the focus is detected in the one-shot AF. The in-focus state is maintained while SW1 is turned on. Therefore, the focus detection area must be displayed only once when the one-shot AF is performed. The determination for that is performed in step # 708. It is determined whether or not the focus detection area at the time of focusing is already displayed. If it is already displayed, it is not necessary to display it, so the process proceeds to step # 714, and if it is not yet displayed, the process proceeds to step # 709. .

The processing of the following steps # 709 to # 712 is for displaying the focus detection area at the time of focusing, but the meaning of the display in the case of automatic selection of the focus detection area and the case of arbitrary selection Is a little different. If optional, the selected focus detection area (focus detection area set by the photographer)
However, in the case of automatic selection, the selected focus detection area and the focus detection area within the focus range with respect to the selected focus detection area are also displayed. This is to inform the photographer of the in-focus range. Then, the display at this time is performed in such a manner that the focus detection area selected by the photographer can be distinguished from the focus detection area within the in-focus range. [Step # 709] First, set the current value of the superimposing LED corresponding to the selected focus detection area to 40.
Set to mA. [Step # 710] The superimposing LED corresponding to the selected focus detection area is lit for 50 ms.

The processing from step # 711 below is a part for performing the determination and control for distinguishing and displaying the focus detection area selected in the automatic selection display and the focus detection area within the focusing range. [Step # 711] First, it is determined whether or not the focus detection area is automatically selected. If the focus selection area is automatically selected, as described above, the focus detection area selected and the focus within the focus range with respect to the selected focus detection area are determined. In order to display the detection areas so that they can be distinguished from each other, the process proceeds to step # 711, and if optional, the process proceeds to step # 714. [Step 712] The current value of the superimposing LED corresponding to the selected focus detection area and the focus detection area within the in-focus range with respect to the selected focus detection area is set to 40 mA. This display operation may be performed by blinking display at a predetermined cycle, for example. [Step # 713] The superimposing LEDs corresponding to the selected focus detection area and the focus detection area within the focus range with respect to the selected focus detection area are set to 5
Turns on for 0 ms. [Step # 714] The subroutine "focus detection area display 1" is ended, and the process returns to the main routine.

As described above, the focus detection area during control until the photographing lens 1 reaches the in-focus position is displayed during the first focus detection operation. However, focus detection during the first focus detection operation is performed. Since the area display is displayed weak (thin) and the focus detection area display at the time of focusing is displayed strongly (dark), the photographer can be informed separately.

In the case of automatic selection, the selected focus detection area is lit strongly (dark) twice, and the focus detection area within the focusing range is lit strongly (dark) once, so that the photographer is informed. The focus detection area actually selected and the focus detection area within the focus range can be distinguished and notified.

Next, the subroutine "focus detection area display 2" according to the present invention will be described with reference to the flowchart of FIG.

This subroutine "focus detection area display 2"
Displays the selected focus detection area in focus detection during continuous shooting.

During continuous shooting, a moving subject is often photographed. Especially when the focus detection area is automatically selected, if the focus detection area selected during continuous shooting can be known, the photographer Be beneficial to. [Step # 800] When the subroutine "focus detection area display 2" is called, the processing from step # 801 is started. [Step # 801] It is determined whether or not the focus state of the taking lens 1 is within the focus range, and if it is within the focus range, the process proceeds to step # 802. [Step # 802] Since the focus detection area is strongly displayed when it is within the focus range, the current value of the superimposing LED corresponding to the selected focus detection area is set to 40 m.
Set to A.

In step # 801, if the focus state of the taking lens 1 is not within the in-focus range, step # 80
Proceed to 3. [Step # 803] Since the focus detection area is displayed weakly when it is out of the focus range, the current value of the superimposing LED corresponding to the selected focus detection area is set to 5 mA. [Step # 804] The superimposing LED corresponding to the selected focus detection area is lit for 50 ms. [Step # 805] The subroutine "focus detection area display 2" is ended, and the process returns to the main routine.

As described above, even during distance measurement during continuous shooting, the focus detection area display is weak when the taking lens 1 is moved to the in-focus state, and the focus detection area is displayed when it is within the in-focus range. Since the detection area display is strongly displayed, the photographer can confirm the current focus state and the selected focus detection area while gazing at the subject.

(Second Embodiment) In the first embodiment, the lighting time is the same during the control for moving the focus state of the photographing lens to the in-focus position and when the in-focus position is reached. Then, the display form was changed by changing the brightness.

In the second embodiment of the present invention, the display of the focus detection area during the control for moving the focus state of the taking lens to the in-focus position is weakened (thinned) by decreasing the current value. The lighting time is always performed during the control of moving the focus state of the photographing lens to the in-focus position. Further, the display of the focus detection area when the focus position is reached is such that the current value is increased to be stronger (darker), and the lighting time is a fixed time.

The actual operation will be described below. Since the electrical and mechanical structure of the camera is the first embodiment, it is omitted here.

21 and 2 for the subroutine "focus detection area display 1" in the second embodiment of the present invention.
2 will be described. [Step # 900] When the subroutine "focus detection area display 1" is called, the processing from step # 901 is started. [Step # 901] It is determined whether or not the current focus is the first focus detection, and if it is the first focus detection, step # 9.
02, otherwise step # 906 in FIG.
Proceed to. [Step # 902] It is determined whether or not the focus detection area is automatically selected. If it is arbitrary selection, the procedure proceeds to step # 904, and if it is automatic selection, the procedure proceeds to step # 903. [Step # 903] One-shot AF or Servo AF
If it is one-shot AF, the superimpose corresponding to the focus detection area is not displayed in this case, and therefore the process proceeds to step # 915 in FIG. 22, and if it is the servo AF, the process proceeds to step # 904. [Step # 904] The current value of the superimpose LED corresponding to the selected focus detection area is set to 5 mA. [Step # 905] Here, the superimpose LED corresponding to the selected focus detection area is turned on.

The lighting time here is not a fixed time as in the first embodiment, but is maintained until the next setting. Then, it progresses to step # 915 of FIG.

If it is determined in step # 901 that the current focus is not the first focus detection, the process proceeds to step # 906 in FIG. 22 as described above. [Step # 906] First, it is determined whether or not it is the one-shot AF. If it is the servo AF, the process proceeds to step # 914 because no display is made. If it is the one-shot AF, the process proceeds to step # 907. [Step # 907] If it is the one-shot AF and the current focus state of the taking lens 1 is not the in-focus state, there is no need to display it, so the process proceeds to step # 915, and if the in-focus state, the process proceeds to step # 908. move on. [Step # 908] It is determined whether or not the focus detection area at the time of focusing is already displayed. If it is already displayed, it is not necessary to display it. Therefore, the process proceeds to step # 915, and if it is not yet displayed. Go to step # 909. [Step # 909] The current value of the superimposing LED corresponding to the selected focus detection area is set to 40 mA. [Step # 910] The superimposing LED corresponding to the selected focus detection area is lit for 50 ms. [Step # 911] It is determined whether or not the focus detection area is automatically selected. If the focus detection area is automatically selected, the focus detection area selected and the focus detection area within the focus range with respect to the selected focus detection area as described above. Also proceeds to step # 911 in order to display so that they can be distinguished, and if optional, proceeds to step # 915. [Step # 912] The current value of the superimposing LED corresponding to the selected focus detection area and the focus detection area within the focus range with respect to the selected focus detection area is set to 40 mA. [Step # 913] The superimposing LEDs corresponding to the selected focus detection area and the focus detection area within the in-focus range with respect to the selected focus detection area are set to 5
Turns on for 0 ms. [Step # 914] All superimposing L
Turn off ED. [Step # 915] The subroutine "focus detection area display 1" is ended, and the process returns to the main routine.

FIG. 23 is a block diagram of FIG. 1 in the first embodiment.
It is a flowchart corresponding to the operation of 0, and only different parts will be described here.

When the switch SW1 or the switch SW2 for photometry and AF is turned off, the process proceeds to step # 128 to turn off the superimposing LED.

By doing so, the display of the focus detection area during the control for moving the focus state of the taking lens 1 to the in-focus position is weakened (thinned) by decreasing the current value, and the lighting time is This can be always performed during the control of moving the focus state of the taking lens 1 to the in-focus position. Further, the display of the focus detection area at the in-focus position can be made stronger (darker) by increasing the current value, and the lighting time can be set to a fixed time.
Therefore, as in the first embodiment, the photographer can be notified of the selected focus detection area accurately.

According to each of the above embodiments, if the display form of the focus detection region under control for moving the focus state of the taking lens to the in-focus position is different from the display form of the focus detection region during focus. In the one-shot AF mode, the photographer can clearly see the display at the start of focus detection and the display at the time of focusing even if the processing time for focus detection is short. Can be identified.

Further, in the one-shot AF, in the automatic selection mode, the display form is made different between the selected focus detection area and the focus detection area within the focus range with respect to the focus detection area. Therefore, the photographer can clearly recognize the actually selected focus detection area and the focus detection area within the in-focus range.

In the servo AF operation, the selected focus detection area can be confirmed at a glance even in the automatic selection mode. In particular, it is effective during continuous shooting, and it becomes possible to confirm the selected focus detection area while confirming the current focus state when shooting a moving subject.

(Modification) In the first and second embodiments, the display form is changed according to the combination of the lighting time and the display brightness, but the present invention is not limited to this.
A method of changing the color of the display of the focus detection area between the display of the focus detection area when the focus state of the shooting lens is controlled to move to the focus position and the display of the focus detection area when the focus position is reached. Alternatively, a method of distinguishing between blinking and blinking may be used.

The present invention can be applied to an image recording medium other than a film.

The present invention can be applied to any method such as optical and magnetic methods as long as data can be recorded.

The present invention may be a cartridge of a type other than the film cartridge described in the embodiment, a cartridge having an image recording medium other than a film, and other types of cartridges or a load other than the cartridge.

The present invention can be similarly applied even when the film cartridge is loaded not from the bottom side of the camera but from the top or side, for example. INDUSTRIAL APPLICABILITY The present invention can be applied to the one-frame feeding of the film, whether by winding or rewinding.

The film movement signal is not limited to the rotating pulse plate, but the present invention can be applied to any other detection method such as direct detection of film perforation with a photo interrupter. The present invention can be applied even if the film movement signal is other than the pulse signal.

The present invention can be applied even if the charging operation is directly performed by the motor without passing through the sprocket.

The present invention can be applied even if the object to be charged is something other than a shutter, such as a lens barrel.

Although the present invention has been described with respect to a single-lens reflex camera, it is also applicable to cameras such as lens shutter cameras and video cameras.

[0151]

As described above, according to the present invention,
During the control of moving the taking lens to the in-focus position, the selected focus detection area is displayed in the first display form, and when the taking lens reaches the in-focus position, the selected focus detection area is displayed. Focus detection area display means for performing display in the second display mode is provided, and the focus detection area selected is displayed when the photographing lens is moving to the in-focus state and when the in-focus state is reached. I try to make the form different.

Therefore, even when the focus detection processing time is short, the fact that the focus state is reached at the start of focus detection is
It can be clearly recognized by the photographer.

Further, according to the present invention, during the control for moving the taking lens to the in-focus position, the selected focus detection area is displayed in the first display form so that the taking lens reaches the in-focus position. In this case, the focus detection area display means for displaying the selected focus detection area and the focus detection area within the focus range with respect to the focus detection area in the second display mode is provided, and the focus lens is adjusted by the focus lens. The display form of the selected focus detection area is made different between when the focus state is moved and when the focus state is reached, and when the focus state is reached, the selected focus detection area is detected. The focus detection area within the in-focus range with respect to the area is also specified.

Further, according to the present invention, during the control for moving the taking lens to the in-focus position, the selected focus detection area is displayed in the first display form so that the taking lens reaches the in-focus position. In this case, the selected focus detection area is displayed in the second display mode, and the focus detection area within the focus range with respect to the focus detection area is displayed in the third display mode. When a display unit is provided, the display form of the selected focus detection area is changed between when the photographing lens is moving to the in-focus state and when the in-focus state is reached, and when the in-focus state is reached. In addition, the focus detection area within the in-focus range with respect to the selected focus detection area is also displayed in a different display form.

Therefore, even when the processing time for focus detection is short, the distinction between the start of focus detection and the fact that the in-focus state is reached, and when the in-focus state is reached, are actually selected. The photographer can clearly recognize the distinction between the focus detection area and the focus detection area within the in-focus range.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a main part of a single-lens reflex camera according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a top surface and a back surface of the camera of FIG.

FIG. 3 is a diagram for explaining the inside of the viewfinder field of FIG. 1;

FIG. 4 is a diagram for explaining the configuration of the mode dial of FIG.

5 is a diagram for explaining the configuration of the electronic dial of FIG.

FIG. 6 is a block diagram showing an electrical configuration of the camera of FIG.

7 is a monitor LCD and a finder LCD shown in FIG.
It is a figure which shows the full lighting state of.

FIG. 8 is a flowchart showing a part of a main operation of the camera of FIG.

9 is a flowchart showing a continuation of the operation of FIG.

FIG. 10 is a flowchart showing a continuation of the operation shown in FIG. 9;

11 is a flowchart showing a part of a release operation of the camera of FIG.

FIG. 12 is a flowchart showing an operation following that of FIG.

FIG. 13 is a flowchart showing a continuation of the operation shown in FIG.

14 is a flowchart showing an interrupt process of a feeding system of the camera of FIG.

15 is a flowchart showing a focus detection operation of the camera of FIG.

16 is a flowchart showing a focus detection area selection operation of the camera of FIG.

FIG. 17 is a flowchart showing a photometric operation of the camera of FIG.

FIG. 18 is a flowchart showing an operation of part of focus detection area display 1 of the camera of FIG. 1.

FIG. 19 is a flowchart showing a continuation of the operation shown in FIG. 18;

FIG. 20 is a flowchart showing a part of the operation of the focus detection area display 1 of the camera according to the second embodiment of the present invention.

FIG. 21 is a flowchart showing an operation following that of FIG. 20.

FIG. 22 is a flowchart showing a part of a main operation of the camera of the second embodiment of the present invention.

FIG. 23 shows the above-mentioned FIG. 1 in the second embodiment of the present invention.
It is a flowchart which shows the operation | movement of the part different from 0.

[Explanation of symbols]

 1 Photography Lens 6 Focus Detection Device 6f Image Sensor 10 Photometric Sensor 21 Superimpose LED 100 CPU 103 Automatic Focus Detection Circuit 106 LED Drive Circuit 108 Shutter Control Circuit 109 Motor Control Circuit 110 Focus Adjustment Circuit

Claims (10)

[Claims] 1. A focus detection unit for detecting a focus state of a plurality of focus detection regions, a focus detection region display unit for displaying a position corresponding to the plurality of focus detection regions, and a focus detection unit obtained by the focus detection unit. A camera with a focus detection function, comprising: a lens driving unit that drives a shooting lens based on focus information of a focus detection region selected from a plurality of focus detection regions, wherein the focus detection region display unit is the shooting lens. The selected focus detection area is displayed in the first display mode during the control for moving the focus position to the focus position. When the photographing lens reaches the focus position, the selected focus detection area is displayed. The camera with a focus detection function, characterized in that 2. A focus detection means for detecting focus states of a plurality of focus detection areas, a focus detection area display means for displaying positions corresponding to the plurality of focus detection areas, and a focus detection means which is obtained from the focus detection means. A camera with a focus detection function, comprising: a lens driving unit that drives a shooting lens based on focus information of a focus detection region selected from a plurality of focus detection regions, wherein the focus detection region display unit is the shooting lens. Is moved to the focus position, the selected focus detection area is displayed in the first display form, and when the photographing lens reaches the focus position, the selected focus detection area and the selected focus detection area are displayed. A camera with a focus detection function, characterized in that a means for displaying a focus detection area within a focus range with respect to the focus detection area in a second display form is used. 3. A focus detection means for detecting focus states of a plurality of focus detection areas, a focus detection area display means for displaying positions corresponding to the plurality of focus detection areas, and the focus detection means. A camera with a focus detection function, comprising: a lens driving unit that drives a shooting lens based on focus information of a focus detection region selected from a plurality of focus detection regions, wherein the focus detection region display unit is the shooting lens. The selected focus detection area is displayed in the first display mode during the control for moving the focus position to the focus position. When the photographing lens reaches the focus position, the selected focus detection area is displayed. In the second display mode, the focus detection area within the focusing range with respect to the focus detection area is displayed in the third display mode. . 4. The camera with a focus detection function according to claim 1, wherein the focus detection area display means is a means for changing the display form by changing the brightness of the display. 5. The focus detection function display device according to claim 1, wherein the focus detection area display means is a means for changing a display form by changing display brightness and lighting time. camera. 6. The camera with a focus detection function according to claim 1, wherein the focus detection area display means is a means for changing a display form by changing a display color. 7. An automatic selection mode for automatically selecting at least one focus detection area from among the plurality of focus detection areas based on respective focus information obtained by the focus detection means, and an instruction by an external operation. 4. The camera with focus detection function according to claim 1, further comprising a setting means for setting any one of arbitrary selection modes for selecting the selected focus detection area. 8. A focus detection mode includes a one-shot orcus mode and a servo autofocus mode,
4. The camera with a focus detection function according to claim 1, wherein display of the focus detection area during focusing is prohibited when the servo auto focus mode is selected. 9. A focus detection mode includes a one-shot orcus mode and a servo autofocus mode,
When the servo auto focus mode is selected, display of the focus detection area at the time of focusing is prohibited, and control is performed to move the taking lens to the in-focus position in the automatic selection mode in the one-shot orcus mode. The camera with a focus detection function according to claim 7, wherein the display of the inside is prohibited. 10. A focus detection means for detecting focus states of a plurality of focus detection areas, a focus detection area display means for displaying positions corresponding to the plurality of focus detection areas, and a focus detection means which is obtained from the focus detection means. In a camera with a focus detection function equipped with a lens driving means for driving a taking lens based on focus information of a focus detection area selected from a plurality of focus detection areas, in continuous shooting, the next time after the last shooting is finished. When the area selected by the focus detection performed before the start of shooting is in focus, the area is displayed in the first display mode, while when the area is out of focus, A camera with a focus detection function, comprising display control means for displaying a region in a second display form.