JPH07199262A - Camera provided with image blurring correcting function - Google Patents

Abstract

PURPOSE:To eliminate troublesomeness in the case of setting an image blurring correction mode and to optionally change the image blurring correction mode in accordance with the intention of a photographer. CONSTITUTION:This camera is provided with an image blurring correction mode setting means CCPU deciding whether an image blurring correcting means is actuated or not according to a photographing condition set by a photographing condition setting means SWMOD setting the photographing condition for recording a subject image on film or an imaging device, and an image blurring mode changing means SWIS changing the image blurring correction mode set by the image blurring correction mode setting means; and the optimum image blurring correction mode is automatically decided for the set photographing condition in the camera, and the photographer can change the image blurring correction mode as necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a camera with an image blur correction function for suppressing (correcting) image blur caused by camera shake or the like.

[0002]

2. Description of the Related Art Conventionally, a still camera or a camera equipped with an image blur correction device for suppressing image blur on an image pickup surface due to camera shake during holding of a movie camera has been proposed and already commercialized. It is also being done.

Considering the necessity of the image blur correction function at the time of photographing, in a still camera, the focal length of the photographing lens is long, or the subject is dark, and the amount of image blur occurs during exposure. Is more than the permissible circle of confusion, and in movie cameras, the focal length is long,
This is a case where the image blurring at the time of monitoring the recorded image is uncomfortable. In other words, the image blur correction function is unnecessary except in the above case.

On the other hand, when the image blur correction function is activated, the life of the power source of the camera is shortened due to an increase in power consumption due to the operation of the image blur correction mechanism. Also has a problem in that it acts to hinder the operation.

Therefore, a camera equipped with an image blur correction device has a switching means or a selection means for switching between operation and non-operation of the image blur correction device. As one of the switching and selecting methods, a method in which the photographer selects the operation or non-operation of the image blur correction device with a dedicated switch (hereinafter, this method is referred to as a manual switching method) is proposed by the applicant of the present application. , Japanese Patent Laid-Open No. 4-95933 and the like. In the proposed camera, the interchangeable lens of the single-lens reflex camera is provided with a switch for selecting the operation / non-operation of the image blur correction function, and when the switch is set to the operation position by the photographer, the first stroke of the release button is set. When the switch is turned on, image blur correction works.

On the other hand, as another method of switching and selecting the operation / non-operation of the image blur correction function, a method of operating the image blur correction when the camera determines that the image blur correction is necessary (hereinafter, this method is an automatic switching method). (Also called), some proposals have been made. For example, JP-A-4-
In No. 56831, the detected image shake amount is compared with a preset predetermined value, and if the shake amount is smaller than the predetermined value, the image shake correction is automatically stopped.
Further, Japanese Patent Laid-Open No. 2-181741 proposes to stop the image blur correction when it is recognized that the camera is fixed to a tripod or the like.

[0007]

However, the above-mentioned conventional example has the following problems.

First, in the manual switching method described above, once the operation and non-operation of the image blur correction function are set,
When it is necessary to switch the image blur correction function in a rush at the time of shooting, the quick switching cannot be performed, and the shooting operation must be interrupted once.

On the other hand, in the automatic switching system, when the switching is performed against the photographer's intention, it cannot be prevented. In other words, the operation and non-operation of the image blur correction function are left to the camera, and the photographer's intention cannot be reflected.

(Object of the Invention) An object of the present invention is to eliminate the trouble of setting the image blur correction mode, and
It is an object of the present invention to provide a camera with an image blur correction function that can arbitrarily change the image blur correction mode according to the photographer's intention.

[0011]

SUMMARY OF THE INVENTION According to the present invention, an image blur correction means is provided in accordance with a photographing condition set by a photographing condition setting means for setting a photographing condition for recording a subject image on a film or an image pickup device. Image blur correction mode setting means for deciding whether to operate or not, and image blur mode changing means for changing the image blur correction mode set by the image blur correction mode setting means. On the other hand, the camera automatically determines the optimum image blur correction mode, and the photographer can change the image blur correction mode as needed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

1 to 5 are views relating to a first embodiment of the present invention, and FIG. 1 is a configuration diagram of a main part thereof.

In FIG. 1, CMR is a camera body and LN.
Reference numeral S denotes a lens that can be attached to and detached from the camera body CMR.

First, the camera body CMR side will be described.

The CCPU is a microcomputer in the camera (hereinafter referred to as a microcomputer), and includes ROM, RAM, A /
A one-chip microcomputer with a D, D / A conversion function,
A series of camera operations such as automatic exposure control (AE), automatic focus adjustment (AF), film winding (drive), etc. are performed according to the camera sequence program stored in the ROM. Therefore, the in-camera microcomputer CCPU communicates with the peripheral circuits and the lens LNS in the camera body CMR to control the operation of each circuit and lens.

Four sets of connection terminals are provided on the mount portion for connecting the camera body CRM and the lens LNS. BA
T is an in-camera power supply, which supplies power to each circuit and actuator in the camera and also to the lens LNS via the line VL. DCL is the microcomputer C in the camera
DLC is a line for transmitting a signal from the CPU to the microcomputer LCPU in the lens described later, and DLC is the microcomputer LC in the lens
It is a line for transmitting a signal from the PU to the in-camera microcomputer CCPU, and the camera CMR controls the lens LNS through these two lines. Further, each ground is also connected via the line GND.

FP is a photosensitive film or an image plane on which an image pickup device is arranged, and a shutter SH composed of a light-shielding blade and a blade drive control section is arranged immediately in front of it. AESNS
Is a photometric means for measuring the subject brightness, AFSNS is a focus detection means for detecting the focus state of the subject image, and DR is a feeding means for film feeding and shutter charging.

SWMN is a main switch, and when the switch is turned on, the microcomputer CCPU permits execution of a predetermined program relating to photographing. SW1 and SW2 are switches interlocked with the release button of the camera, and are turned on by pressing the first stroke and the second stroke of the release button.

SWMOD is a photographing mode selection switch. When the photographer sets the switch to a predetermined position, the photographing mode intended by the photographer is set, and the optimum AE mode, AF mode, and feeding mode are set. Mode and image stabilization mode are selected. SWIS is an image blur correction changeover switch, and is a switch for changing the image blur correction mode determined by the selection of the photographing mode selection switch SWMOD.

The above two switches SWMOD and SWI
The action of S is the most characteristic of this embodiment,
This action will be described in detail later.

SWUD is an up / down switch for changing photographing conditions. The DISP is a display means composed of a liquid crystal panel and a drive circuit thereof, and displays information on various mode states selected by the photographing mode selection switch SWMOD, shutter speed, aperture value, film sensitivity and the like. LED
IS is a light emitting diode that informs the photographer that image blur correction is being performed, and is arranged in the viewfinder of the camera CMR.

Next, the structure of the lens LNS side will be described.

LCPU is a microcomputer in the lens, and like the microcomputer CCPU in the camera, ROM, RAM, A / D,
A microcomputer having a D / A conversion function, which controls driving of a focusing motor, a zooming motor, an aperture control motor, and an image shake correction actuator, which will be described later, in accordance with a command sent from a camera microcomputer CCPU via a signal line DCL. . Further, various operating conditions of the lens and parameters peculiar to the lens are transmitted to the camera microcomputer CCPU via the signal line DLC.

L1, L2, and L3 are first, second, and third lens groups each consisting of a plurality of lenses, which form a photographic optical system having a zoom function, and the photographic optical system forms a subject image. It is formed on the image plane FP of the camera body CMR.

FMTR is a focusing motor, which is the first
Focusing is performed by moving the lens unit L1 back and forth in the optical axis direction, and the focus encoder ENCF detects information corresponding to the position of the first lens unit L1, that is, the subject distance, and sends it to the microcomputer LCPU. ZMTR is a zooming motor, and zooming is performed by moving the first and second lens units L1 and L2 back and forth in the optical axis direction in a predetermined relationship by a zoom mechanism (not shown), and the zoom encoder ENCZ detects the zoom state. Send to the microcomputer LCPU. DMTR is a step motor for diaphragm control.

Reference numeral GR denotes a camera shake detection sensor such as a vibration gyro, which is a camera vertical (pitch) direction and left and right (yaw).
Directional angle shake is detected, and the result is detected by the microcomputer LCPU.
Send to.

The IACT is an actuator that drives the second lens unit L2 supported by a mechanism (not shown) so as to perform image blur correction in each direction so that it can be independently shifted in a two-dimensional direction on a plane perpendicular to the photographing optical axis. Therefore, the image on the image plane FP is also shifted by the shift of the lens unit L2. Therefore, by image-shifting the second lens group L2 according to the camera shake information from the camera shake sensor GR, the image shake caused by the camera shake can be corrected.

Since image shake correction is performed independently in two pitch and yaw directions, the camera shake sensor GR and the image shake correction actuator IACT are provided in two sets each for pitch and yaw correction.

FIG. 2 is a diagram showing the operating members and display means of the single-lens reflex camera having the above-mentioned structure.

A mode dial DLMOD for selecting a photographing mode is arranged on the left upper surface of the camera body CMR. The mode dial DLMOD includes a main switch SWMN and a shooting mode selection switch SWMOD in FIG.
In the L (lock) position shown in FIG. 2, the main switch SWMN is turned off to prohibit the operation of the camera, and when set to any position other than L, the main switch SWMN is turned on, The shooting mode selection switch SWMOD corresponding to the dial index is turned on, and the start of the shooting preparation operation in the predetermined shooting mode is permitted.

A release button BTLS is arranged on the right upper surface of the camera body CMR, and the release button BTLS is provided.
When the first stroke is pressed, the switch SW1 in FIG. 1 is turned on, and when the second stroke is pressed, the switch SW2 is turned on. BT
IS is an image blur correction switching button, and when the button BTIS is pressed, the image blur correction switching switch SWIS of FIG. 1 is turned on. DLUD is an up-down dial, and by rotating the mode dial DLUD in the right or left direction, a predetermined direction terminal of the up-down switch SWUD in FIG. 1 is turned on to change the operating condition.

DISP is the display means shown in FIG. 1, and is a display unit D1 for displaying shutter speed, a display unit D2 for displaying aperture value, a display unit D3 for displaying the number of photographed frames, an AF mode display unit D4, and a drive. A mode display section D5 and an image blur correction mode display section D6 are provided. The AF mode display section D4
Then, a one-shot AF mode (OS) in which AF is not performed again after the focus is obtained once, and a servo AF mode (SV) in which repeated AF is performed are displayed. The drive mode display portion D5 displays the single shooting mode (S) and the continuous shooting mode (C). Further, the image blur correction mode display portion D6
Then, "IS" is displayed in the image blur correction operation mode,
In the inactive mode, “IS” is hidden.

FIG. 3 shows the mode dial DLMOD of FIG.
The modes selected by the camera in accordance with the setting position of, that is, the combinations of the AE mode, AF mode, drive mode, and image blur correction mode are shown.

For example, when the mode dial DLMOD is set to the "fully automatic" mode, the AE is the program A.
E and AF automatically switch between one-shot AF and servo AF according to the movement of the subject in the optical axis direction, and the shooting mode in which the drive is single-shot and the image blur correction is on is selected.

Next, the operation method and operation of the camera will be described with reference to FIGS.

The photographer uses the mode dial DLMOD shown in FIG.
Is set to a position other than L, the camera microcomputer CC
The PU reads the states of the switches SWMN and SWMOD in FIG. 1 and stores the shooting mode number described at the left end of FIG. 3 in a predetermined register. Then the microcomputer CCPU
Selects and sets the AE mode, the AF mode, the drive mode, and the image shake correction mode as shown in FIG. 3 according to the set shooting mode number and the program stored in the ROM.

The AF mode and the drive mode are as described above, and the image blur correction mode indicates that the image blur correction is on when the image blur correction mode is on and the image blur correction is not performed when the image blur correction mode is off.

In this state, the first release button BTLS
When the stroke is pressed, photometry, exposure condition setting, AF, and image blur correction are performed in each predetermined mode, and the exposure operation and the drive operation are performed by pressing the second stroke.

Here, if the image blur correction switching button BTIS is pressed once when the release button BTLS is not operated,
The image blur correction mode is reversed. For example, when the shooting mode is manual, the initial setting state of the image blur correction mode is non-operation (OFF), but the image blur correction switch button BTIS
When is pressed, the in-camera microcomputer CCPU detects this and sets the image blur correction mode to the operation (ON) mode. Then, when the button BTIS is pressed again, the image blur correction returns to the non-operation mode, and the mode inversion is repeated by operating the button BTIS.

With the above operation, when the photographer selects the photographing mode of the camera, the camera selects the image blur correction mode suitable for the mode, so that the image blur is prevented even under the condition that the image blur may occur. One member (in this embodiment, the image blur correction switch button BTIS as described above) is used when the photographer wants to effectively suppress and to change the image blur correction mode.
You can easily change it by.

FIGS. 4 and 5 are flowcharts showing the operations of the camera body CMR and the lens LNS for realizing the above operation. First, the camera body CMR will be described with reference to FIG.
The operation on the side will be described.

After step (101), step (10
In 2), the RAM in the camera microcomputer CCPU
Clears and initializes all control flags and variables set in. Then, in step (103),
The state of the main switch SWMN is detected to determine whether or not the mode dial DLMOD is unlocked. If it is in the locked state, the process returns to step (102), and if it is unlocked, the process proceeds to step (104).

In step (104), the state of the photographing mode selection switch SWMOD is detected, the selected photographing mode is recognized, and the mode number is stored in a predetermined register. In the next step (105), the AE mode, AF mode, drive mode, and image blur correction mode are selected and set according to the mode set in step (104). Then step (1
In 06), the mode set in the above steps (104) and (105) is displayed on the display means DISP.

In the next step (107), the state of the image blur correction changeover switch SWIS is detected. If the switch is off, the process jumps to step (109), and if it is on, the process proceeds to step (108) to reverse the image blur correction mode and latch that state. Step (1
09), the state of the switch SW1 is determined,
If it is off, the process proceeds to step (110) to send a command for stopping the image blur correction to the lens LNS. The instruction is an instruction to stop the operation of the image blur correction mechanism when the image blur correction mechanism is operating, and an instruction to continue the state when the image blur correction mechanism is stopped. Then, the process returns to step (103).

While the switch SW1 is off, the steps (103) to (110) are repeatedly executed. However, when the image blur correction mode is inverted and latched in the step (108), the step (10) is performed thereafter.
When returning to step 5), since the latch operation is effective, the image blur correction mode setting in step (105) is ignored. However, in step (107), the switch SWIS is turned on again.
Is recognized as ON, the next step (108)
The re-inversion and the latch of the image blur correction mode in (3) are executed.

When it is determined in step (109) that the switch SW1 is on, the process proceeds to step (121). In this step (121), communication with the in-lens microcomputer LCPU is performed to receive information such as the focal length of the lens, the AF sensitivity, and the open F number. Then, in the next step (122), the above step (10
5) Alternatively, the image blur correction mode set in step (108) is discriminated, and if the mode is a non-operation mode, the process jumps to step (124), and if it is the operation mode, the process advances to step (123).

In step (123), the lens L
A command to start image blur correction is sent to the NS. The instruction is an instruction to start the operation when the image blur correction mechanism is stopped, and an instruction to continue the state when the image shake correction mechanism is operating. In the next step (124), the subject brightness is measured by the photometric means AESNS shown in FIG. Next, in step (125), a combination of shutter speed and aperture value is calculated based on the photometric result and the AE mode set in step (105).

In the next step (126), the AF
If the focus history is determined and if the one-shot AF has already been performed, AF is not performed and the process jumps to step (129).
Otherwise, go to step (127).

In step (127), focus detection is performed by the focus detection means AFSNS in FIG. 1 to calculate the defocus amount and the lens drive amount. Then, in the next step (128), the lens drive amount is transmitted to the lens microcomputer LCPU to issue a focusing command.

In step (129), the state of the switch SW2 is determined. If the switch SW2 is off, the process returns to step (109), and steps (121) to (129) are repeated.

Further, in the above step (129),
When it is determined that the switch SW2 is on, the step (14
1) The subsequent exposure sequence is executed.

In other words, in step (141), a stop command for the focusing operation and a stop command based on the aperture value calculated in step (125) are transmitted to the in-lens microcomputer LCPU. And Tep (142)
In, driving a well-known mirror-up mechanism,
Evacuate the mirror. Next, in step (143), the shutter SH is controlled at the shutter time calculated in step (125). Then step (1
In 44), an aperture return command is transmitted to the microcomputer LCPU in the lens, and the mirror return operation is performed in the following step (145). Then, in step (146),
The drive means DR of FIG. 1 is driven to perform film feeding and shutter charging.

In the next step (147), the drive mode is determined, and if it is the single-shot mode, step (1
09), and if the switch SW1 is still on here, step (121) and the subsequent steps are executed again. on the other hand,
If the drive mode is continuous shooting mode, step (12
Returning to 9), if the switch SW2 remains on, step (141) and subsequent steps are executed to perform continuous shooting.

Next, the operation of the lens microcomputer LCPU incorporated in the lens LNS will be described with reference to the flowchart of FIG.

In FIG. 1, the mode dial DLMOD
Is operated from the locked position to another position, power is also supplied to each circuit in the lens from the power supply BAT in the camera via the line VL, and the microcomputer LCPU in the lens executes the program after step (201). To start.

In step (202), all the control flags and variables set in the RAM in the lens microcomputer LCPU are initialized and cleared. Then, in the next step (203), it is determined whether or not a lens communication command [corresponding to step (121) in FIG. 4] is received from the camera body CMR, and if it is, step (2)
The process proceeds to 04) where the data unique to the lens built in the microcomputer LCPU in the lens and the operation status of each actuator in the lens are transmitted. If no lens communication request has been received, that is, if the switch SW1 is off, the process returns to step (202) and stands by in the initial state.

In step (205), the image blur correction start command [step (1 in FIG. 4
[Corresponding to 23)] is determined, and if so, the process proceeds to step (206), where the image blur correction actuator IACT is driven to perform image blur correction. If the start command has not arrived, the process jumps to step (207).

In step (207), it is determined whether or not a focusing lens drive command [corresponding to step (128) in FIG. 4] has been received from the camera. If so, the process proceeds to step (208). The focusing motor FMTR is driven by. If the drive command is not received, the process jumps to step (211).

In step (211), it is judged whether or not a focusing lens stop command [corresponding to step (141) in FIG. 4] is received from the camera body CMR.
If so, the process proceeds to step (212) where the focusing motor FMTR is forcibly stopped. If the stop command has not come, the process jumps to step (213).

In step (213), it is judged whether or not a narrowing-down command [corresponding to step (141) in FIG. 4] is received from the camera, and if it is, step (214).
Then, the step motor DMTR for aperture control is driven. If the command has not arrived, step (21
Jump to 5).

In step (215), it is judged whether or not an aperture return command [corresponding to step (144) in FIG. 4] has been received from the camera, and if so, step (21)
Proceed to 6), and here the above step control motor D for aperture control.
The MTR is driven in reverse, and the aperture is returned to the open state. Also,
If the instruction has not arrived, the process jumps to step (217).

In step (217), it is determined whether or not an image blur correction stop command (corresponding to step (110) in FIG. 4) has come. If yes, the process proceeds to step (218), where the image After the shake correction actuator IACT is returned to the origin, it stops. If the instruction has not arrived, the process returns to step (203).

According to the above flow, the camera automatically selects the image blur correction mode as to whether or not the camera performs the image blur correction according to the photographing mode set by the photographer, and the selected image blur The photographer can change the correction mode as needed.

(Second Embodiment) In the first embodiment, the camera automatically determines and sets the image blur correction mode according to the set photographing mode, and the photographer can set the image blur correction mode as needed. By operating the image blur correction changeover switch SWIS, the image blur correction mode is turned off.

On the other hand, in the second embodiment of the present invention described below, the camera determines whether or not the image blur exceeds the allowable amount during exposure regardless of the photographing mode, and the image blur correction is performed. The mode is automatically switched on and off, and the image blur correction mode can be switched from the automatic switching mode to always on or to always off by the operation of the switch SWIS by the photographer. .

FIG. 6 shows the operation of the second embodiment of the present invention. An image blur correction flag ISFLG is a flag set in the lens microcomputer LCPU, and the flag I
SFLG is classified into three types: ・ When "3n (n is 0 and natural number)", image blur correction is automatically switched on and off ・ When "3n + 1" is always on ・ When "3n + 2" is always Controlled to be off.

FIG. 7 is a diagram showing the operating members and display means of the single-lens reflex camera in the second embodiment of the present invention.
The only difference is that the display means DISP of the first embodiment and the image blur correction mode display section D6 are changed to DISP2 and D26, respectively.

Next, the operation method and operation of the camera of the second embodiment will be described with reference to FIGS.

When the mode dial DLMOD is set to any position other than the lock position, the flag ISFLG in FIG. 6 is initialized to "0" regardless of the photographing mode.
The image blur correction mode is set to the automatic switching mode. Then, "ISAAuto" is displayed on the display portion D26 of FIG.

Here, when the image blur correction switching button BTIS is pressed once, "1" is added to the flag ISFLG, the image blur correction is always in the ON mode, and the display portion D26.
Is displayed as "IS". And this button is another
When the flag is pressed twice, "1" is further added to the flag ISFLG to become "2", the image blur correction is always off, and the display unit 26 is not displayed. Furthermore, the button BTISBTI
When S is pressed, the automatic switching mode in the initial state is returned to, and each time the button BTIS is pressed thereafter, the image blur correction mode is sequentially switched.

Even if the image blur correction always-on mode is referred to here, the image blur correction operation is actually performed only while the switch SW1 is turned on by pressing the first stroke of the release button BTLS. Is.

Next, the operation of the in-camera microcomputer CCPU according to the second embodiment will be described with reference to the flow chart of FIG.

After step (201), step (20)
In 2), all the control flags and variables set in the RAM in the camera microcomputer CCPU are cleared and initialized. Then, in step (203),
The state of the main switch SWMN is detected to determine whether or not the mode dial DLMOD is unlocked. If it is in the locked state, step (202)
Then, if the lock is released, the process proceeds to step (204).

In step (204), the state of the photographing mode selection switch SWMOD is detected, the selected photographing mode is recognized, and the mode number is stored in a predetermined register. In the next step (205), the AE mode, AF mode, drive mode, and image blur correction mode are selected and set according to the mode set in the above step (204).

The image blur correction flag ISFL described above is used.
Since G has been initialized to "0" in the above step (202), the image blur correction mode at this point is as shown in FIG.
Accordingly, the automatic switching mode is set.

In the next step (206), the mode set in the above steps (204) and (205) is displayed on the display means DISP2. Then, in the next step (207), the state of the image blur correction changeover switch SWIS is detected. If the switch is off, the process jumps to step (209), and if it is on, the process proceeds to step (208) to add "1" to the image blur correction flag ISFLG.

Then, in step (209),
The state of the switch SW1 is determined. If the switch SW1 is off, the process proceeds to step (210), where a command to stop the image blur correction is transmitted to the lens LNS. The instruction is an instruction to stop the operation of the image blur correction mechanism when the image blur correction mechanism is operating, and an instruction to continue the state when the image blur correction mechanism is stopped. Then, the process returns to step (203).

While the switch SW1 is off, the steps (203) to (210) are repeated, but the flag ISFLG is set in the step (208).
Is updated, the updated image blur correction mode is set when the process returns to step (205), and then the display is updated in step (206).

In step (209), if it is determined that the switch SW1 is ON, the process proceeds to step (221). In this step (221), the lens microcomputer LCPU is communicated with to open the lens focal length and AF sensitivity. Receive information such as F number. Then, in the next step (222), the subject brightness is measured by the photometric means AESSNS. Then, in step (223), the photometric result and the AE set in step (205) are set.
Depending on the mode, a combination of shutter speed and aperture value is calculated.

In the following step (224), the calculation of the code ISCD for determining whether or not to correct the image blur is performed by the following equation ISCD = ISFLG-3 * INT (ISFL
G / 3). Here, ISFLG is the value set in the above step (208), and INT represents an integer calculation. Then, ISCD in the above formula represents the remainder when ISFLG is divided by 3. That is, ISCD = 0, 1,
2 is ISFLG = 3n, 3n + 1, 3n + 2, respectively
Since it corresponds to (n = 0, 1, 2, ...), the image blur correction mode can be referred to as follows: ・ ISCD = 0, automatic switching mode ・ ISCD = 1, always on mode ・ ISCD When = 2, the mode is always off.

In the next step (225), the above-mentioned code ISCD is discriminated. If "ISCD = 2", the process jumps to step (229), and the image blur correction is not performed. If "ISCD ≠ 2", the process proceeds to step (226). Then, in this step (226) as well, the code I
The SCD is discriminated. If "ISCD = 1", the process jumps to step (228) to send an image blur correction start command to the lens to perform image blur correction. On the other hand, "ISCD ≠
1 ”, that is, if“ ISCD = 0 ”, step (22
Proceed to 7).

In step (227), it is judged whether or not there is a risk of image blur. In a still camera using a 35 mm format film, it is generally said that the handshake limit time is 1 / focal length. That is, the shutter speed is t _exp (sec) and the focal length is f
(Mm), when 1 <t _exp * f, there is a risk of image blur due to camera shake. Therefore, in this step (227), the shake determination is performed according to the above equation. Although the constant Co in this step (227) is “Co = 1” according to the above equation, a value different from this may be adopted if necessary.

If YES at this step (227), at the next step (228), the lens LN
A command to start image blur correction is transmitted to S. The command is
When the image blur correction mechanism is stopped, it becomes an instruction to start the operation, and when it is in operation, it becomes an instruction to continue the state.

If NO at step (227), the process jumps to step (229) and the image blur correction start command is not output. And this step (22
In 9), the AF focusing history is discriminated and the one-shot A
If focus is already achieved at F, AF is not performed and step (23
2) jump to step (23) otherwise
Go to 0).

In step (230), focus detection is performed by the focus detection means AFSNS, and the defocus amount and the lens drive amount are calculated. Then step (231)
In the lens microcomputer LCP
Send to U and give Focusing command.

In the following step (232), the state of the switch SW2 is determined. And the switch SW2
If is turned off, the process returns to step (209), and step (22
Steps 1) to (231) are repeatedly executed.

If it is determined in step (232) that the switch SW2 is on, step (241)
The subsequent exposure sequence is executed.

That is, in step (241), a stop command for the focusing operation and a stop command with the aperture value calculated in step (223) are transmitted to the in-lens microcomputer LCPU. And the next step (2
In 42), a not-shown known mirror-up mechanism is driven to retract the mirror. Then, the step (243)
In step (223), the shutter SH is controlled according to the shutter time calculated in step (223. Next step (24
In 4), an aperture return command is transmitted to the microcomputer LCPU in the lens, and in the subsequent step (245), the mirror return operation is performed. Then, the next step (2
In 46), the drive means DR of FIG. 1 is driven to perform film feeding and shutter charging.

Next, in step (247), the drive mode is determined, and if it is the single-shot mode, step (2
09, and if the switch SW1 remains on, the steps (221) and the subsequent steps are executed again. On the other hand, if the drive mode is the continuous shooting mode, the process returns to step (232), and if the switch SW2 remains on, the process proceeds to step (2).
41) and subsequent steps are executed and continuous shooting is performed.

The lens LN in the second embodiment is
The operation in S is performed by the lens LN of the first embodiment shown in FIG.
Since it is the same as S, the description thereof is omitted.

According to the above flow, the main switch S
When the WMN is unlocked and the photographing mode is selected, the image blur correction mode is set to the automatic switching mode. Then, in this mode, the amount of image blur during exposure is estimated to determine whether image blur correction is necessary. Further, by operating the image blur correction changeover switch SWIS by the photographer, the image blur correction mode can be switched from the automatic changeover mode to the always-on mode or the always-off mode.

(Third Embodiment) In addition to the image blur during exposure described in the second embodiment, the harm caused by camera shake has the disadvantage that framing cannot be accurately performed. in this case,
The criterion for determining whether image blur correction is necessary depends only on the shake amplitude and the focal length of the photographing lens.

Therefore, in the third embodiment of the present invention described below, the maximum value of the image shake amplitude within a predetermined time is detected from the shake amplitude within a predetermined time and the focal length of the photographing lens, and the detected value is determined according to the detected value. The image blur correction mode is automatically set, and the photographer can change the mode.

FIG. 9 is a flow chart showing the operation of the in-camera microcomputer CCPU in the third embodiment of the present invention. This flow is different from the flow of the second embodiment shown in FIG. 8 in that the step (323) is inserted between the step (223) and the step (224), and the step (227) is the step (327). ), The other parts are the same, and the duplicate description is omitted.

In step (209), the switch S
When it is determined that W1 is on, lens communication, photometry, and exposure calculation are performed from step (221) to step (223).

In the next step (323), the integrated value θ _AV2 of the camera shake displacement θ is _calculated . Calculate according to the formula. Here, the camera shake displacement θ is camera shake angular displacement data obtained by receiving the camera shake angular velocity signal detected by the camera shake detection sensor GR in the lens via the in-lens microcomputer LCPU and performing calculations such as integration. on the other hand,
“T = 0” indicates the current time, and “t = −Δt” indicates the past by Δt from the present.

Therefore, θ _AV2 in the above equation is the square of the camera shake angular displacement θ during the time Δt, and represents the time average of the absolute values of the camera shake angular displacement. That is, in this step, the magnitude of camera shake during the predetermined time Δt is calculated.

In the next step (224), the image blur correction code ISCD is calculated. Subsequent steps (22
In 5), if "ISCD = 2", that is, if the image blur correction always-off mode is determined, the process jumps to step (229).

In step (226), "ISC
D = 1 ”, that is, when it is determined that the image blur correction always-on mode is set, the process jumps to step (228).

The step (327) is executed by "I
SCD = 1 ”, that is, the image blur correction automatic switching mode. In this step (327), the camera shake integrated value θ _AV2 calculated in the above step (323)
And the focal length f are greater than a predetermined determination level C ₁ . Then, if the product is larger than the predetermined judgment level C _1, it is judged that the image blur correction is necessary, and the process proceeds to step (228). If it is less than the predetermined judgment C _{1, the} process jumps to step (229).

The lens L in the third embodiment is
The operation of the NS is also similar to that of the lens LNS of the first embodiment shown in FIG. 5, and therefore its explanation is omitted.

According to the above flow, the main switch S
When the WMN is unlocked and the photographing mode is selected, the image blur correction mode is set to the automatic switching mode. Then, in this mode, it is determined whether or not image blur correction is necessary based on the camera shake of the photographer and the focal length of the photographing lens.
Further, by operating the image blur correction changeover switch SWIS by the photographer, the image blur correction mode can be switched from the automatic switching mode to the always-on mode or the always-off mode.

In the third embodiment, the image blur correction necessity / unnecessity determination in the image blur correction automatic switching mode may be judged only by the focal length of the taking lens. The reason is that human hand shake has some individual differences in absolute amplitude value,
This is because it can be regarded as almost constant.

(Fourth Embodiment) A fourth embodiment of the present invention described below is a combination of the features of the first and third embodiments, and its operation is shown in FIG.

In FIG. 10, the mode dial DLMO
When D is set to a position other than L, the initial mode of image blur correction for each shooting mode is set to the mode shown at the right end of the figure. The contents of the image blur correction mode shown here are the same as those shown in the second embodiment. Then, each time the image blur correction switching button BTIS of the camera is pressed, the image shown in FIG.
The image blur correction mode is switched as shown in.

FIG. 12 is a flow chart showing the operation of the in-camera microcomputer CCPU in the fourth embodiment of the present invention. Steps (204) and (205) are added to the flow of the second embodiment shown in FIG. The difference is that only the step (404) is added during ().

That is, in the second embodiment, the initial value of the flag ISFLG for determining the image blur correction mode is
It is always "0" regardless of the shooting mode.
In the embodiment of FIG.
The flag ISFLG is set to “0” based on the table shown in FIG.
A predetermined value of either "1" or "2" is set. Then, in the next step (205), the image blur correction mode corresponding to this is selected, and then in step (20)
The result is displayed in 6).

After step (207), as in the second embodiment, the flag ISF is switched every time the switch SWIS linked with the image blur correction switching button BTIS is turned on.
The value of LG is updated and the image blur correction mode is switched.

As described above, in the fourth embodiment, since the image blur correction mode suitable for the photographing mode is set more finely, the operability of the camera is further improved.

Of the first to fourth embodiments described above, the second and fourth embodiments are specific to still cameras, but the first and third embodiments are movie cameras. Naturally, it can be applied. In this case, the main switch SWMN and the mode switch SWMOD for selecting the shooting mode in FIG. 1 have the same operation as the still camera, the switch SW1 is a standby switch for starting image display on the electronic viewfinder, and the switch SW2 is a recording start switch. You can correspond.

Further, in the embodiments of the present invention, the image blur correction system is an optical system in which a part of the image forming optical system is displaced, but it is also possible to use the image blur correction system by the image signal processing of the image sensor. Applicable.

According to each of the above-described embodiments, the camera automatically determines the optimum image blur correction mode in accordance with the photographing conditions, and when it is desired to change the determined image blur correction mode, the image of the photographer is taken. Since the mode can be switched according to the operation of the shake correction mode switch SWIS, in normal photographing, there is no need to set the image shake correction mode, and the mode is changed according to the intention of the photographer. As a result, it is possible to provide a user-friendly image blur correction device.

[0114]

As described above, according to the present invention,
Image blur correction mode setting for determining the operation / non-operation of the image blur correction unit according to the photographing condition set by the photographing condition setting unit for setting the photographing condition for recording the subject image on the film or the image pickup device Means and image shake mode changing means for changing the image shake correction mode set by the image shake correction mode setting means, and the camera automatically selects the optimum image shake correction mode for the set shooting conditions. And the photographer can change the image blur correction mode as needed.

Therefore, it is possible to eliminate the trouble of setting the image blur correction mode and to arbitrarily change the image blur correction mode according to the intention of the photographer.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a camera with an image blur correction function used in each embodiment of the present invention.

FIG. 2 is a top view of the camera of the first embodiment of the present invention.

FIG. 3 is an operation explanatory view of the camera of the first embodiment of the present invention.

FIG. 4 is a flowchart showing an operation of the in-camera microcomputer according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the microcomputer in the lens according to the first embodiment of the present invention.

FIG. 6 is an explanatory view of the operation of the camera of the second embodiment of the present invention.

FIG. 7 is a top view of the camera of the second embodiment of the present invention.

FIG. 8 is a flowchart showing the operation of the microcomputer in the camera according to the second embodiment of the present invention.

FIG. 9 is a flowchart showing the operation of the in-camera microcomputer according to the third embodiment of the present invention.

FIG. 10 is an operation explanatory view of the camera of the fourth embodiment of the present invention.

FIG. 11 is an explanatory view of the operation of the camera of the fourth embodiment of the present invention.

FIG. 12 is a flow chart showing the operation of the microcomputer in the camera in the fourth embodiment of the present invention.

[Explanation of symbols]

 CMR camera body CCPU In-camera microcomputer SWMN main switch SWMOD mode switch SWIS Image blur correction mode selector switch LNS lens LCPU In-lens microcomputer GR Image stabilization sensor L2 Second lens group for image blur correction IACT Image blur correction actuator

Claims (5)

[Claims] 1. An image forming means for forming an image of a subject on an image forming surface, a photographing condition setting means for setting a photographing condition for recording the subject image on a film or an image sensor, and the image forming means. In a camera with an image blur correction function, which comprises image blur correction means for suppressing the blurring of a subject image due to applied vibration, the image blur correction means according to the photographing condition set by the photographing condition setting means. Image blur correction mode setting means for determining the operation and non-motion of the image, and image blur mode changing means for changing the image blur correction mode set by the image blur correction mode setting means. Camera with shake correction function. 2. The image blur correction function according to claim 1, wherein the photographing condition setting means includes at least exposure control mode setting means for adjusting an exposure amount to a film or an image pickup device. camera. 3. The camera with image blur correction function according to claim 1, wherein the photographing condition setting means includes at least means for setting a focal length of the image forming means. 4. The image blur correction mode changing means includes a first image blur correction mode in which the image blur correction means is always operated at least during photographing, and a second image blur correction mode in which the image blur correction means is inoperative. 2. The camera with an image blur correction function according to claim 1, wherein the camera is a means for setting any of the above. 5. A discriminating means for discriminating the magnitude of image blur at the time of photographing is provided, and the image blur correction mode changing means has at least a first image blur correcting mode for always operating the image blur correcting means at the time of photographing, Based on the second image blur correction mode in which the image blur correction unit is inoperative and the output of the discrimination unit,
2. A camera with an image blur correction function according to claim 1, which is a means for setting either of a third image blur correction mode in which the image blur operation of the image blur correction means is automatically switched. .