JP2002049066A - Image blur correcting system, camera system and interchangeable lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress power consumption by stopping the useless drive of an image blur correcting means in the case a signal related with the drive of the image blur correcting means is not received for a prescribed time. SOLUTION: As for the image blur correcting system constituted by combining a photographing device and an optical device with the image blur correcting means, the photographing device is provided with a transmitting means for transmitting the signal related with the drive of the image blur correcting means to the optical device, and the optical device is provided with drive control means (#167 and #168) for receiving the signal related with the drive of the image blur correcting means, then, controlling the drive of the image blur correcting means based on the signal, and also, stopping the drive of the image blur means in the case the signal related with the drive is not received for the prescribed time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image blur correction system, a camera system, and an interchangeable lens comprising a combination of a photographing device and an optical device having image blur correction means.

[0002]

2. Description of the Related Art Conventionally, an interchangeable lens-type image stabilizing lens for a camera has been known. Japanese Patent Application Laid-Open No. 6-250272 and JP-A-6-250272 disclose an example in which a camera shake detection means for detecting camera shake and an image shake correction means for correcting image shake caused by the shake are provided in the interchangeable lens. Kaihei 7-19
No. 9257, for example. In these conventional examples, the drive stop of the image blur correction means is performed by a stop signal from the camera side to the interchangeable lens side.

[0003]

However, Japanese Patent Application Laid-Open Nos. Hei 6-250272 and Hei 7-19925 mentioned above do not.
In the system described in Japanese Patent Application Publication No. 7-1995, the drive stop of the image blur correction means is performed by a stop signal from the camera side, so that the operator does not operate the stop switch or the like.
In some cases, the camera does not output a drive stop signal of the image blur correction means, and the image blur correction means provided in the interchangeable lens remains driven, which results in wasteful power consumption.

(Object of the Invention) An object of the present invention is to stop useless driving of the image blur correction means when a signal relating to driving of the image blur correction means is not generated for a predetermined time, thereby reducing power consumption. It is an object of the present invention to provide an image blur correction system, a camera system, and an interchangeable lens capable of suppressing or reducing power consumption.

[0005]

According to one aspect of the present invention, there is provided an image blur correction system comprising a combination of a photographing device and an optical device having image blur correction means. The image capturing apparatus includes a transmitting unit configured to transmit a signal related to driving of the image blur correction unit to the optical device, and the optical device receives the signal related to the driving, so that the image based on the signal is used. The image blur correction system includes a drive control unit that controls driving of the shake correction unit and stops driving of the image shake correction unit when a signal related to the drive is not received for a predetermined time. .

According to another aspect of the present invention, there is provided an image blur correction system comprising a combination of a photographing device and an optical device having image blur correcting means. Having transmission means for transmitting a signal related to driving of the image blur correction means to the optical device,
The optical device receives the signal related to the drive, controls the drive of the image blur correction unit based on the signal, and determines the image when the signal related to the drive is not received for a predetermined time. The image blur correction system includes a drive control unit that drives the image blur correction unit to a predetermined position and stops the image blur correction unit.

According to another aspect of the present invention, there is provided a camera system comprising a combination of a camera and an interchangeable lens having image blur correction means, wherein the camera comprises: The interchangeable lens has a transmission unit that transmits a signal related to driving of the correction unit to the camera, and the interchangeable lens receives the signal related to the driving, and controls the driving of the image blur correction unit based on the signal. A camera system having a drive control means for stopping the drive of the image blur correction means when the drive-related signal is not received for a predetermined time.

According to another aspect of the present invention, there is provided a camera system comprising a camera and an interchangeable lens having image blur correction means. A transmission unit that transmits a signal relating to driving of the correction unit to the optical device, wherein the interchangeable lens receives the signal relating to the driving, and controls driving of the image blur correction unit based on the signal; A camera system having a drive control means for driving the image blur correction means to a predetermined position and stopping when a signal relating to the drive is not received for a predetermined time.

According to another aspect of the present invention, there is provided an interchangeable lens having an image blur correcting means and comprising a camera system in combination with a camera. By receiving a signal related to the drive of the shake correcting unit, and controlling the drive of the image shake correcting unit based on the signal, for a predetermined time, when not receiving a signal related to the drive,
An interchangeable lens having a drive control unit for stopping the drive of the image blur correction unit is provided.

According to another aspect of the present invention, there is provided an interchangeable lens having an image blur correcting means and comprising a camera system in combination with a camera. By controlling the driving of the image blur correcting means based on the received signal, when the signal relating to the driving is not received for a predetermined time, the image blur correcting means is controlled in advance. This is an interchangeable lens having drive control means for driving to a determined position and stopping.

[0011]

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

(First Embodiment) FIG. 1 is a configuration diagram of a camera system including a camera body and an interchangeable lens according to a first embodiment of the present invention. Here, the camera body 1
A CPU 2 for controlling the camera body is provided therein, and shake sensors 4 and 5 for detecting shake of the camera body in the yaw and pitch directions are arranged as shown in FIG. The data is converted into digital data by the A / D converter 3 and taken in as data in the CPU 2.

As shown in FIG. 2, an example of a specific configuration of the inside of the shake sensors 4 and 5 includes a vibration gyroscope as an angular velocity sensor, an integration circuit, and the like.

In FIG. 2, a vibration gyro 20 is driven by resonance by a drive circuit 22 and a synchronous detection circuit 2
The output conversion is performed so as to obtain a predetermined angular velocity output by 1 or the like. The output from the synchronous detection circuit 21 usually contains an unnecessary DC offset, and this DC component is removed by a high-pass filter including a capacitor 24 and a resistor 25, and only the remaining shake signal is output from the operational amplifier 2.
3. Amplified by an amplifier composed of resistors 26 and 27. Further, the output of this amplifier is an operational amplifier 28, a resistor 2
The output is integrated by an integrating circuit composed of the capacitors 9 and 30 and the capacitor 31 and is converted into an output proportional to the shake displacement. This integrated output is output to the A / D converter 3 as described above.

Returning to FIG. 1, the sensor output taken into the CPU 2 becomes a shake correction lens drive amount calculated based on information from the interchangeable lens 8. Then, the CPU 2 transmits the data of the shake correction lens driving amount to the lens CPU 11 in the interchangeable lens 8 via the ordinary serial bus line 7 for exchanging information between the camera body 1 and the interchangeable lens 8.
Is forwarded to

In the interchangeable lens 8, the outputs of the position detection sensors 15 and 16 for detecting the absolute position of the shake correction system 9 itself are converted into digital data by an A / D converter 18 and fetched into the CPU 11, where the data is transmitted to the CPU 11. And the above C
The data of the shake correction lens drive amount from the PU 2 is compared with the position of the shake correction system 9, and the comparison result is transferred to the D / A converter 12. And this D / A converter 12
The image blur correction system 9 is configured to drive the shake correction system 9 via the driver circuits 13 and 14 on the basis of the output result from the camera to correct the image shake. Reference numeral 17 denotes a driver circuit for the actuator of the mechanical lock mechanism.

FIG. 3 shows a specific example of the configuration of the shake correction system 9. As shown in FIG.

FIG. 3 shows the configuration of a so-called shift optical system for correcting the angular shake of the camera by shifting the shake correcting lens in the x and y directions perpendicular to the optical axis. Reference numerals 50 and 51 denote yoke portions as magnetic circuit units serving as actual driving sources in the x and y axes directions, and reference numerals 52 and 53 denote coil portions corresponding to the respective yokes. Therefore, when current is supplied from the driver circuits 13 and 14 to the coil unit, the shake correction lens 54, which is a part of the photographing lens, is eccentrically driven in the x and y directions. Reference numeral 55 denotes a support arm and a support frame for fixing the shake correction lens 54.

The movement of the shake correction lens 54 is determined by the movement of the IREDs 56, 5 which move integrally with the shake correction lens 54.
7, and a lens barrel 60 for holding the entire shift lens
Non-contact detection is performed by a combination with the PSDs 62 and 63 attached above. Reference numeral 58 denotes a mechanical lock mechanism for mechanically holding the shake correction lens 54 substantially at the optical axis center when the power supply to the shift system is stopped (the CPU 11 controls the actuator driver circuit 17 for the mechanical lock mechanism by the CPU 11). Reference numeral 59 denotes a charge pin, and reference numeral 61 denotes a support ball as an anti-tilt for restricting the falling direction of the shift system.

Next, the operation of the main part according to the first embodiment of the present invention will be described with reference to FIGS. 4, 5, 6, 8, and 9.
This will be described with reference to the flowchart shown in FIG.

FIG. 4 shows the main processing in the CPU 2 in the camera body 1 related to the image stabilization (image shake correction) operation. In FIG. 4, first, in step # 99, the release operation of the camera body 1 is performed. SW to instruct the start of
1 is turned on, and if it is turned on, a battery check circuit (not shown) determines in step # 100 and step # 101 whether the power supply voltage is sufficient to guarantee the operation of the entire camera. Run by. As a result, when it is determined that the power supply voltage is insufficient, the process proceeds from step # 101 to step # 102, where the process waits until the switch SW1 is turned off, and returns to the start position when the switch SW1 is turned on.

On the other hand, if the result of the battery check is determined to be OK in step # 101, step # 1 is executed.
Proceeding to 03, communication with the CPU 11 in the interchangeable lens 8 is performed, and data used for photometry calculation such as photometry and an open aperture value, data for focus adjustment such as focus adjustment sensitivity, and data corresponding to image stabilization sensitivity. Get. Here, the image stabilization sensitivity is, as described above, the ratio of the amount of drive of the image stabilizing lens to the amount of tilt of the apparatus, and varies depending on the zoom and focus states. Is used for the calculation executed in. In this embodiment, zoom information is used as data corresponding to the image stabilization sensitivity. As a method of transmission and reception, when a predetermined data request signal is transmitted from the camera body 1 to the interchangeable lens 8, the interchangeable lens 8 responds to the predetermined data request signal and corresponds to the anti-vibration sensitivity. The zoom information is transmitted to the camera body 1 as data.

Next, in step # 104, a normal photometric operation is performed, and in subsequent step # 105, actual focus control is executed by driving the focus lens through communication with an optical sensor (not shown) and the CPU 11. . This focus control is continued until the in-focus state can be detected in step # 106, and if the in-focus state can be detected, the process proceeds to step # 107, where the switch ISSW for starting the image stabilization is switched
Is determined whether the switch is ON.
If the SSW is OFF, it is determined that the image stabilizing operation is not required, and the process proceeds to step # 108, the flag ISONL in the CPU 11 is set to 0, and the process immediately proceeds to step # 116.

If it is determined in step # 107 that the switch ISSW is ON, it is determined that the image stabilizing operation has been selected, and the flow advances to step # 109 to issue an unlock command to the camera body 1. From the CPU 2 to the CPU 11 on the interchangeable lens 8 side via the serial bus line 7.

FIG. 7 is a timing chart showing the state of the command communication. In FIG. 7B, SCK is a synchronous clock for serial communication, and SD0 is exchanged from the camera body 1. Serial data SD1 transferred to the lens 8 side is serial data transferred from the interchangeable lens 8 side to the camera body 1 side at the same time.

As shown in FIG. 7, when a camera lock release command of at least one byte is transmitted from the camera body 1 to the interchangeable lens 8, a BUSY signal indicating that data has been received is detected from SD1. As a result, in the CPU 2, the mechanical lock release operation is completed in step # 110 (actually, the mechanical lock release operation is slightly delayed in time, but in sequence, it can be considered that the release is completed by the completion of the command reception). Is determined. Then, the process proceeds to the next step # 111, where the predetermined period T
The timer for interrupting is reset every time, and a new timekeeping operation is started. At the next step # 112, a flag ISO in the CPU 2 indicating the anti-shake operation state is set.
NL is set to 1, and in the next step # 113, the interruption operation of the timer is permitted.

Next step # 114 and step # 11
In 5, the arithmetic registers UY and UP described later are set to 0, respectively.
H. After that, the process proceeds to step # 116, where it is determined whether or not the switch SW2 provided in the camera body 1 is turned on in accordance with the actual shutter release operation. It is determined that the release operation has been started, and the process proceeds to step # 117, where the mirror 6 in the camera body 1 shown in FIG. 1 is raised, and the shutter release operation is performed.

On the other hand, if it is detected in step # 116 that the switch SW2 has not yet been turned ON, it is determined that the photographer is still in the framing operation (photographing composition is determined), and the flow advances to step # 118. Here, it is determined whether the switch SW1 is still ON, and if it is ON, the process returns to step # 116 to repeat the above operation. Also, in step # 118, the switch SW
When the CPU 2 detects that the camera 1 has been turned off, the CPU 2 determines that the photographer has finished shooting with the camera and proceeds to step # 1.
Proceeding to 19, the content of the flag ISONL is determined. Here, if the content of the flag ISONL is 0, it is determined that the anti-shake operation has not been performed, and the process returns to step # 99. If the flag ISONL is 1, the anti-shake operation has been performed and the process proceeds to step # 120. Here, the lock setting command is transmitted. This lock setting command
As in the case of the above-described lock release command (of course, the data content is different), the CPU 2 issues a command to the CPU 11 in FIG.
Is transmitted in the same manner as the timing chart shown in FIG.

In the next step # 121, it is determined whether or not the lock setting has been completed. If it is determined that the lock setting has been completed, the flow advances to step # 122 to inhibit the above-described timer interrupt operation. Thus, a series of these operations is completed.

Next, the interrupt processing operation that occurs at the above-mentioned constant period T will be described with reference to the flowchart of FIG.

In FIG. 5, first, in step # 130, the operation of converting the output from the yaw direction vibration sensor 5 shown in FIG. 1 into digital data by the A / D converter 3 is started. Then, in the next step # 131, when it is detected that the conversion operation has been completed, step # 132 is performed.
To perform a predetermined operation on this conversion result. Here, this data conversion operation will be described with reference to a "data conversion" subroutine shown in FIG.

In the "data conversion" subroutine of FIG.
First, in step # 150, the contents of the ADDATA register in which the A / D conversion result is stored are transferred to the general-purpose operation register A inside the CPU 2, and then transmitted from the CPU 11 in the interchangeable lens 8 in the next step # 151. Come on
Data corresponding to the image stabilization sensitivity indicating the relationship between the "vibration sensor output" and the "correction lens driving amount" (or the image stabilization indicating the relationship between the "image moving amount on the image plane" and the "correction lens driving amount") In this embodiment, data corresponding to the anti-shake sensitivity reflecting the already set zoom state is received and transferred to the general-purpose operation register B in the CPU 2 as well. In the following step # 152, the CPU 2 multiplies the two general-purpose operation registers and sets the result in the register C. The data corresponding to the image stabilization sensitivity transferred to the general-purpose operation register B is obtained by communication with the interchangeable lens 8 in step # 103 of FIG. 4, and this data is updated at regular time intervals as described later. Therefore, the calculation using the latest image stabilization sensitivity can be performed at each time point of the above calculation. Thereafter, the process returns to step # 133 in FIG.

In step # 133 of FIG. 5, the contents of the above calculation result are transferred to the transmission data register C, and in subsequent step # 134, the actual camera body 1
In the method of transmitting the actual shake correction lens driving amount, first, a command indicating the output of the shake sensor is transmitted as shown in the timing chart of FIG. Contains a flag for determining yaw, pitch, etc.), and then transfers the contents of the register C corresponding to the output of the shake sensor as serial data of at least one byte. In addition,
By receiving this signal, the interchangeable lens 8 transmits data corresponding to the image stabilization sensitivity at that time to the camera body 1 as described later (step # 18 in FIG. 9).
6).

When the completion of the data transfer of the shake correction lens driving amount is detected in step # 135, the A / D conversion operation for the sensor output in the pitch direction is started in step # 136. Step #, which is the data transmission processing of the shake correction lens drive amount in the pitch direction
Steps 136 to # 141 are exactly the same as the processing for the sensor output in the yaw direction (steps # 130 to # 135), and a description thereof will be omitted. Finally step # 14
At 2, the timer interrupt flag is set to 0, the interrupt processing operation ends, and the process returns to the main processing of FIG.

As described above, in the processing of the CPU 2, an interrupt is generated at regular intervals T, and the latest data output of the yaw and pitch direction shake correction lens driving amount provided in the camera body 1 is replaced with the interchangeable lens each time. 8 will be transmitted.

Next, the operation of the interchangeable lens 8 will be described with reference to the flowcharts of FIGS.

First, the main processing in the CPU 11 of the interchangeable lens 8 will be described with reference to the flowchart of FIG.

In steps # 160 and # 161 in FIG.
The internal registers CY and CP for correction calculation for lens control are reset to 0H. In the following step # 162, the LCK flag indicating lock setting control is set to 0, and similarly, in step # 163, ULC indicating lock release control is set.
The K flag is set to 0. In the next step # 164, the interrupt operation of the serial interface for receiving the data transmitted from the camera body 1 is permitted.

In the following step # 165, the command received from the camera body 1 last time is a command for driving the shake correction lens 54 (specifically, a command for driving the shake correction lens 54 and an image shake correction means including the support member). It is determined whether the command is data or a command for correction. If so, the process proceeds to step # 166, where the timer TMRHOSEI is reset and started, and the process proceeds to step # 170.

If it is determined that the command is not a command or data relating to image blur correction, the process proceeds from step # 165 to step # 167, where it is determined whether the value of the timer TMRHOSEI is greater than a predetermined time TMRHOSEIDEF.
If it is larger, a predetermined time (TMRHOSEIDEF),
Since the command or data relating to the image blur correction has not been received, the operation of the image blur correction means is stopped in step # 16.
Proceed to 8 to perform a lock operation. Specifically, the CPU 11
The shake correction lens 54 is moved to a lockable position by the control signal from the controller, a current is supplied to the plunger 58 in the mechanical lock mechanism by the actuator driver circuit 17 of the mechanical lock mechanism, and the movement of the shake correction lens 54 is controlled by the lever. Force stop. Then, the process proceeds to step # 169, where the flag LCK is set to 0 and step #
Proceed to 170.

This operation may be the same as the operation of step # 174 described later. However, when moving quickly, power consumption is reduced in consideration of the fact that more power is required due to frictional force and the loss of coil resistance is added. Drive with such power,
Further, it may be driven in a short time.

In step # 170, it is first determined whether or not a command for urging unlocking has been received in a serial interface communication interrupt process described later. If the flag ULCK is 0, an unlocking command is received. Step # 173 as it is
Proceed to.

On the other hand, when the flag ULCK is set to 1, it is determined that the lock release command has been received, and the process proceeds from step # 170 to step # 171 to immediately perform the lock release operation. In this case, the shake correction lens 54 is moved to a lockable position by a control signal from the CPU 11, and the plunger 58 in the mechanical lock mechanism shown in FIG. A current in a predetermined direction is supplied by the driver circuit 17 to release the locking of the shake correction lens 54 which is a shift lens. Then, in the next step # 172, the flag ULCK is set to 0.

In the next step # 173, it is determined whether or not the flag LCK indicating the lock setting is "1". If the flag LCK is "0", it is determined that the lock setting command has not been received, and the process directly returns to step # 164. That is, when the flag LCK is 1, it is determined that the lock setting command has been received, the process proceeds to step # 174, and the lock setting operation is immediately performed. In this case, similarly to the unlocking operation described above, a current is supplied to the plunger 58 in the mechanical lock mechanism in the opposite direction to the unlocking operation by the actuator driver circuit 17 of the mechanical lock mechanism in response to the control signal from the CPU 11. The power is supplied, and the movement of the shake correction lens 54 is forcibly stopped by the lever. Finally, in step # 175, the flag LCK is set to 0, and the process returns to step # 164 to repeat the above-described operation.

As described above, in step # 167, the command or data relating to the image blur correction is not received for a certain period of time.
Even if the driving of the image blur correcting means is stopped, if the command or data relating to the image blur correcting is received again, the image blur correcting means is driven.

Next, the serial communication processing on the interchangeable lens 8 side will be described with reference to the flowchart of FIG.

First, in step # 180, the camera body 1
The command as a communication content sent from the side is decoded, and in the next step # 181, it is determined whether or not the communication content is a lock release command. As a result,
If it is a lock release command, the process proceeds to step # 182, the flag ULCK for prompting the lock release operation inside the CPU 11 is set to 1, and the process immediately proceeds to step # 200.
Here, the flag for the serial interrupt is cleared to 0,
This interrupt operation ends. Therefore, in this case, the unlocking operation is executed in the main processing of FIG. 8 as described above (step # 171 of FIG. 8).

On the other hand, if it is determined in step # 181 that the command is not a lock release command, the flow advances to step # 183 to determine whether the command is a lock setting command. If it is a lock setting command, the flow advances to step # 184. CPU1
The flag LCK for prompting the lock setting command inside 1 is set to 1
And the same as when the unlock command is received, step #
Proceeding to 200, the interrupt operation ends.

If it is determined in step # 183 that the received command is not the lock setting command, the flow advances to step # 185 to determine whether the received data is the data of the yaw direction correction lens drive amount. Step # 1 if the command matches the command for receiving the correction lens drive amount
The program proceeds to step 86, where the contents of the serial data in the format as shown in the timing chart of FIG.
At the same time as setting in the internal SY register, data corresponding to the image stabilization sensitivity indicating the relationship between the "vibration sensor output" and the "correction lens drive amount" (or the "movement amount of the image on the image plane")
Is transmitted to the camera body 1 side, which represents the relationship between the correction amount and the “correction lens drive amount”. The data corresponding to the image stabilization sensitivity is data reflecting both the setting state of the zoom lens and the setting state of the focus lens at the time of data transmission. Then, in the next step # 187, the position detection sensor 15 (IRE) detecting the yaw direction movement of the shake correction system 9 shown in FIG.
A / D converter 18 starts the operation of converting the output of the A / D converter into digital data, and in the next step # 188, it is determined whether or not this A / D conversion operation has been completed. Make a decision. If it is determined that the A / D conversion operation has been completed, the process proceeds to step # 189, and the result is transferred to the TY register inside the CPU 11. The following step # 190 is performed so that the contents of the SY register storing the data corresponding to the output from the position detection sensor 15 and the contents of the TY register storing the data corresponding to the position output of the correction system match. Then, the feedback calculation of the yaw correction system is executed, and the calculation result is transferred to the OY register in the CPU 11 in the next step # 191. As soon as this control operation is completed, the process proceeds to step # 200, and this interrupt operation is completed.

On the other hand, if it is determined in step # 185 that the received command is not the command for receiving the yaw shake correction lens driving amount data, the process proceeds to step # 192. When it is determined that the received data is the pitch correction lens drive amount reception data, steps # 193 to # 198 are executed, and the drive control of the shake correction system 9 in the pitch direction is performed. Is exactly the same as the above-described drive control in the yaw direction (steps # 186 to # 191), and a description thereof will be omitted.

If it is determined in step # 192 that the received command is not the command for the pitch shake correction lens driving amount data, the flow advances to step # 199 to perform normal lens communication (for example, focus and aperture control, photometry, distance measurement, After completion of the operation, in step # 200, the serial communication interrupt flag is cleared and all serial interrupt processes are terminated.

As described above, in the first embodiment of the present invention, as shown in steps # 167 to # 169 in FIG. 8, the drive of the shake correction lens 54 from the camera body 1 to the interchangeable lens 8 is performed. When no command or data related to the command is generated for a predetermined time (not received by the interchangeable lens 8),
Since the drive of the image blur correction means is locked at a predetermined position by a lock means having a mechanical configuration,
Unnecessary driving of the image blur correction means can be prevented, and the power consumption for blur correction during this time can be suppressed to almost zero.

(Second Embodiment) FIG. 10 is a flowchart showing the main processing of an interchangeable lens according to a second embodiment of the present invention, and corresponds to the flowchart of FIG. 8 in the first embodiment. Is what you do. The other parts are the same as in the first embodiment, and the description thereof is omitted.

In FIG. 10, step # 16 of FIG.
Steps # 8 and # 169 are changed to step # 260.

In step # 167, it is determined whether the value of the timer TMRHOSEI is greater than a predetermined time TMRHOSEIDEF, as described above. If the value is larger than the predetermined time TMRHOSEIDEF, a command or data relating to the predetermined time Since it has not been received, the process proceeds to step # 260 to stop the drive of the image blur correction means, and the blur correction lens 54 is driven to a predetermined position and stopped at that position. In addition, as a method of stopping, after stopping at the position in that state, stopping at the movable center position, or driving to the position where the energy to be held is the minimum (the position where the shake correction lens etc. has fallen by gravity from the movable center position) There is a stop. In order to keep the lens at this position, it is necessary to continuously output a drive signal in the pitch and yaw directions to a drive means including a coil or the like for driving the shake correction lens. The means for holding the shake correction lens at the position is referred to as an electric lock means). In this case, the power consumption is small, and the power consumption can be reduced as compared with the normal shake correction.

(Third Embodiment) FIG. 11 shows a camera system according to a third embodiment of the present invention.
Specifically, it is a block diagram showing an electrical configuration showing a state in which an interchangeable lens having a built-in image blur correction means is attached to a camera body.

In FIG. 11, reference numeral 201 denotes a contact 209c (for clock signal), 209d for communication from the camera body side.
(Communication from the camera body to the lens signal transmission), and a shake correction system 202, a zoom drive system 203, a focus drive system 204, and an aperture drive system 205 are received according to the command value.
And a lens CPU for controlling the shake correction system 202.

The shake correction system 202 includes a shake sensor 206 for detecting shake, a signal processing system 207 for performing feedback control based on a signal from the shake sensor 206, and an actual shake based on a control signal from the signal processing system 207. A shake correction lens 208 for performing a correction operation (an image shake correction unit is formed by the shake correction lens 208 and its support member).
Consists of

The zoom drive system 203 includes a CPU 201
The lens barrel is driven to change the focal length of the lens according to a command value from or when a switch (not shown) is pressed by the photographer. The focus drive system 204 performs focusing by driving a lens for focus adjustment according to a command value from the CPU 201. The aperture drive system 205 performs an operation of reducing the aperture to a set position or returning to an open state according to a command value from the CPU 201.

The CPU 201 also transmits information on the state inside the lens (zoom position, focus position, aperture value, etc.) and information on the lens (open aperture value, focal length, data necessary for distance measurement calculation, etc.) for communication. (Interchangeable lens → for signal transmission from the camera body) to the camera body side.

The lens electric system 210 is constituted by the CPU 201, the shake correction system 202, the zoom drive system 203, the focus drive system 204, and the aperture drive system 205. The mount electric contact 209 is connected to the lens electric system 210.
a, power supply 2 in the camera body through GND contact 209b
Power is supplied from 18.

In the camera main body, an electric system 211 in the main body is provided.
The distance measuring unit 212, the photometric unit 213, the shutter unit 21
4, a display unit 215, another control unit 216, and a camera CPU 217 for performing management such as operation start and stop, exposure calculation, distance measurement calculation, and the like. The power is also supplied from the power supply 218 in the main body to the electric system 211 in the main body.

Reference numeral 221 (SW1) is a switch for performing photometry and distance measurement, and 222 (SW2) is a release switch. These are generally two-stage stroke switches, and are the first stroke of a release button. Turns on the switch SW1 and turns on the switch SW2 in the second stroke.
N. Reference numeral 223 (SWM) denotes an exposure mode selection switch. The mode can be changed by turning the switch 223 on or off, or by operating the switch 223 and other operation members simultaneously.

In the case of a system having the above-described shake correction system 202, the shake correction system 202 is built in the interchangeable lens side in FIG. 11, but an adapter which is inserted between the camera body and the interchangeable lens. It may take the form of The configuration of the shake correction system 202 can be, for example, the same as that shown in FIG.

Next, the operation of each CPU will be described with reference to FIG.
And the flowchart of FIG.

First, the operation of the CPU 217 provided in the camera will be described with reference to the flowchart of FIG.

First, at step # 301, the switch S
The state of W1 is detected, and if the switch SW1 is OFF, the process stays in this step, and then turns ON to proceed to step # 302. And this step # 30
In 2, communication with the interchangeable lens is performed. This communication is A
This is communication for obtaining information necessary for performing E and AF, and the CPU 217 is a CPU 2 provided in the interchangeable lens.
When a communication command is transmitted to the CPU 01, the CPU 201 transmits information such as a focal length, AF sensitivity, and an open F number.
In the following step # 303, an IS operation start command is transmitted to the interchangeable lens side. Then, the next steps # 304 and #
In 305, a known photometry and distance measurement subroutine is executed.

In the next step # 306, it is determined whether or not the subject is in focus.
Hereinafter, the same operation is repeated.

On the other hand, if in-focus, the process proceeds from step # 306 to step # 307, where the switch SW2 is turned off.
N is determined, and if it is OFF, the process returns to step # 301. If it is ON, the process proceeds to step # 308 to perform the mirror-up operation. The front shutter of the illustrated shutter is driven to start exposure. Then, in the next step # 310, exposure is performed for the time of the set shutter speed, and thereafter, the process proceeds to step # 311 to cause the rear curtain of the shutter to run, and the exposure ends. Finally, in step # 312, a mirror down operation is performed, and a series of photographing operations ends.

Next, the operation of the CPU 201 provided in the interchangeable lens will be described with reference to the flowchart of FIG.

First, in step # 321, upon receiving a communication command from the CPU 217 provided in the camera body in the AE / AF communication shown in step # 302 in FIG. 12, the CPU 201 sets the focal length and AF sensitivity. Transmit information such as the open F number. Then, in the next step # 322, the CPU 217 calculates a distance measurement,
The focus adjustment lens is driven based on the transmitted focus adjustment lens movement amount.

In the next step # 323, the reception of the IS operation command is detected. If the IS operation command is not received, the process proceeds to step # 325, where the detection of the IS stop command is detected. If the IS stop command is received, the process immediately proceeds to step # 340. If the IS stop command is not received, the process proceeds to step # 339, and it is determined whether the timer TMRHOSEI is greater than a predetermined time TMRHOSEIDEF.
If smaller, the process returns to step # 321. Timer TM
If RHOSEI is greater than the predetermined time TMRHOSEIDEF, the process proceeds from step # 339 to step # 340. Since the command or data relating to the image blur correction for the predetermined time (TMRHOSEIDEF) has not been received, the vibration correction lens 2
In order to stop the driving at step 08, the shake correction lens 208 is driven to a lockable predetermined position. Then, in the next step # 341, a lock operation is performed. Specifically, a control signal from the CPU 217, for example, as shown in FIG.
A current is supplied to the plunger 58 in the mechanical lock mechanism by an actuator driver circuit (included in the signal processing system 207 in FIG. 11) of the mechanical lock mechanism, and the movement of the shake correction lens 208 is forcibly stopped by the lever. .

If the reception of the IS operation command is detected in step # 323, the process proceeds to step # 324,
Here, the timer TMRHOSEI is reset and started. Then, in the next step # 326, the output of the shake sensor and the shake correction amount are read.
At 27, the data is A / D converted, and at the next step # 328, the data is converted into data for driving the shake correction lens 208. Then, in step # 329, the shake correction lens 208 is driven to perform shake correction.

In the next step # 330, the switch SW
2 and the ON signal is received. When the ON signal is received, the process proceeds to step # 331, where the shake sensor output and the shake correction amount are read, and the data is A / D converted in the next step # 332. Then, the next step # 333
At step # 334, the mirror and shutter shake data stored in the ROM are read. At step # 334, the data is converted into data for driving the shake correction lens 208.
At 5, the camera shake correction lens 208 is driven to perform camera shake correction. Then, in the next step # 336, the exposure is performed by narrowing down the aperture through the aperture drive system 205. If the end of the exposure is not detected in step # 337, the process proceeds to the step # 336.
Returning to step 331, if the end of exposure is detected, step # 33 is executed.
Proceeding to 8, the diaphragm is opened to end a series of operations, and the process returns to step # 321.

As described above, in the third embodiment of the present invention, as shown in steps # 339 to # 341 in FIG. 13, the command for driving the shake correction lens 208 from the camera body to the interchangeable lens side. Alternatively, when data is not generated for a predetermined time (not received by the interchangeable lens), the drive of the image blur correction means is locked at a predetermined position by a lock means having a mechanical structure, so that image blur correction is performed. Unnecessary driving of the means can be prevented, and power consumption for shake correction during this time can be suppressed to almost zero.

(Fourth Embodiment) FIG. 14 is a flowchart showing the operation on the interchangeable lens side according to a fourth embodiment of the present invention.
This corresponds to the flowchart of FIG. The other operations are the same as those in the third embodiment, and the description thereof is omitted.

In FIG. 14, step # 3 of FIG.
Step # 400 is added as a process when it is determined to be YES at 39.

In step # 339, it is determined whether or not the timer TMRHOSEI is larger than the predetermined time TMRHOSEIDEF, as described above. Since there was no such motion, the process proceeds to step # 400 to stop driving the shake correction lens 208, and the shake correction lens 2
08 is driven to a predetermined position and stopped. Note that the method of stopping is the same as in the second embodiment.

With the above configuration, the power consumption for driving the image blur correcting means can be reduced as in the second embodiment.

(Modification) In each of the embodiments described above, a shake sensor composed of a vibrating gyroscope is assumed as the shake detection means. However, other angular velocity sensors or other sensors (displacement,
For example, an angular displacement sensor, a speed sensor, an acceleration, an angular acceleration sensor, or an area sensor may be used. Further, as the image blur correction means, one that performs image blur correction by moving an optical member in a plane substantially perpendicular to the optical axis is used, but other image blur correction means such as a variable apex angle prism are used. May be used.

In each of the above embodiments, an example in which the present invention is applied to a silver halide camera has been described. However, the present invention can be similarly applied to other image pickup devices such as video cameras and digital cameras and other optical devices. .

[0082]

As described above, according to the present invention,
If a signal relating to the driving of the image blur correction means is not generated for a predetermined time, unnecessary driving of the image blur correction means is stopped, and power consumption can be suppressed or power consumption can be reduced. A correction system, a camera system, or an interchangeable lens can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a camera system according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a specific configuration inside shake sensors 4 and 5 shown in FIG.

FIG. 3 is a perspective view showing a configuration of a shake correction system 9 shown in FIG.

FIG. 4 is a flowchart showing main processing on the camera body side according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing timer interrupt processing on the camera body side in the first embodiment of the present invention.

FIG. 6 is a flowchart showing a detailed operation in step # 132 of FIG. 5;

FIG. 7 is a diagram for explaining communication in the camera system according to the first embodiment of the present invention.

FIG. 8 is a flowchart showing main processing on the interchangeable lens side according to the first embodiment of the present invention.

FIG. 9 is a flowchart illustrating an operation of a serial interrupt process in the interchangeable lens according to the first embodiment of the present invention.

FIG. 10 is a flowchart showing main processing on the interchangeable lens side according to a second embodiment of the present invention.

FIG. 11 is a block diagram showing an electrical configuration of a single-lens reflex camera according to a third embodiment of the present invention.

FIG. 12 is a flowchart illustrating an operation of the camera body according to the third embodiment of the present invention.

FIG. 13 is a flowchart showing an operation of the interchangeable lens according to the third embodiment of the present invention.

FIG. 14 is a flowchart showing an operation on the interchangeable lens side according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera main body 2 CPU 4,5 Shake sensor 8 Interchangeable lens 9 Shake correction system 11 CPU 202 Shake correction system 206 Shake sensor 208 Shake correction lens 210 CPU

Claims (18)

[Claims] 1. An image blur correction system comprising a combination of a photographing device and an optical device having image blur correcting means, wherein the photographing device transmits a signal relating to driving of the image blur correcting means to the optical device. The optical device receives a signal related to the drive, controls the drive of the image blur correction unit based on the signal, and transmits a signal related to the drive for a predetermined time. An image blur correction system comprising: a drive control unit that stops driving of the image blur correction unit when no reception is performed. 2. The optical device according to claim 1, further comprising: a mechanical lock unit configured to mechanically lock the image blur correcting unit to a predetermined position. The drive control unit transmits a signal related to the drive for a predetermined time. When not receiving, the image blur correcting means is driven to a position where the mechanical locking means functions, and then the image blur correcting means is locked at a predetermined position by the mechanical locking means. 2. The image blur correction system according to 1. 3. The image blur correction system according to claim 1, wherein the optical device is an interchangeable lens. 4. An image blur correction system comprising a combination of a photographing device and an optical device having image blur correcting means, wherein the photographing device transmits a signal relating to driving of the image blur correcting means to the optical device. The optical device receives a signal related to the drive, controls the drive of the image blur correction unit based on the signal, and transmits a signal related to the drive for a predetermined time. An image blur correction system comprising: a drive control unit that drives the image blur correction unit to a predetermined position and stops the image blur correction unit when the image blur correction is not received. 5. The image blur correction system according to claim 4, further comprising an electric lock unit for holding the image blur correction unit at the predetermined position. 6. The image according to claim 4, wherein the predetermined position is a position at a time when it is determined that the driving signal is not received for the predetermined time. Image stabilization system. 7. The image blur correction system according to claim 4, wherein the predetermined position is a movable center position of the image blur correction unit. 8. The image according to claim 4, wherein the predetermined position is a position where the power for holding the image blur correction unit at the predetermined position is the smallest. Image stabilization system. 9. The image blur correction system according to claim 5, wherein the optical device is an interchangeable lens. 10. A camera system comprising a combination of a camera and an interchangeable lens having image blur correction means, wherein the camera has a transmission means for transmitting a signal relating to driving of the image blur correction means to the camera. Then, the interchangeable lens receives the signal related to the drive, controls the drive of the image blur correction unit based on the signal, and for a predetermined time, when not receiving the signal related to the drive, A camera system comprising a drive control unit that stops driving of the image blur correction unit. 11. The interchangeable lens includes a mechanical lock unit that mechanically locks the image blur correction unit at a predetermined position, and the drive control unit transmits a signal related to the drive for a predetermined time. When not receiving, the image blur correcting means is driven to a position where the mechanical locking means functions, and then the image blur correcting means is locked at a predetermined position by the mechanical locking means. The camera system according to claim 10. 12. A camera system comprising a combination of a camera and an interchangeable lens having image blur correction means, wherein the camera transmits a signal relating to driving of the image blur correction means to the optical device. The interchangeable lens receives a signal related to the drive, controls the drive of the image blur correction unit based on the signal, and, for a predetermined time, when not receiving a signal related to the drive. And a drive control means for driving the image blur correction means to a predetermined position to stop the image shake correction means. 13. The camera system according to claim 12, further comprising an electric lock unit for holding said image blur correction unit at said predetermined position. 14. The apparatus according to claim 1, wherein the predetermined position is a position at a time when it is determined that the drive-related signal is not received for the predetermined time.
14. The camera system according to 2 or 13. 15. The camera system according to claim 12, wherein the predetermined position is a movable center position of the image blur correction unit. 16. The apparatus according to claim 12, wherein the predetermined position is a position where the power for holding the image blur correcting unit at the predetermined position is the least.
2. The camera system according to 1. 17. An interchangeable lens having an image blur correcting means and constituting a camera system in combination with a camera, wherein a signal relating to driving of the image blur correcting means is received from the camera, and Controlling the driving of the image blur correction means based on the predetermined time,
An interchangeable lens comprising a drive control unit that stops driving of the image blur correction unit when a signal related to the drive is not received. 18. An interchangeable lens having an image blur correcting means and constituting a camera system in combination with a camera, wherein the interchangeable lens receives a signal relating to driving of the image blur correcting means, and based on the signal, Drive control means for controlling the drive of the image blur correction means and driving the image blur correction means to a predetermined position and stopping when a signal relating to the drive is not received for a predetermined time. An interchangeable lens characterized by the following.