JP2002244174A - Optical system and camera system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Even when transmission of a drive signal for driving a shake correction system and transmission of other control signals overlap, communication load between a main unit and an attached device is excessive. , So that the shake correction control repeatedly performed at certain time intervals and the other control can be performed in parallel and smoothly. SOLUTION: A main unit having a shake detecting means for detecting a shake of an optical axis, and a calculating means for calculating a drive signal for driving a shake correction system of the accessory device according to an output of the shake detecting means, and A drive unit for receiving the drive signal of the shake correction system and the shake correction system, and a shake correction system driving unit that drives the shake correction system in accordance with the drive signal, If the communication load on the communication line increases due to an increase in the control signal, the optical system is configured to change the transmission interval of the drive signal (# 118, # 121).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an optical system having an image blur correction function and a camera system.

[0002]

2. Description of the Related Art Conventionally, as an image stabilizing function in a camera system, as shown in FIG. 16, there are built-in shake sensors 4 and 5 for detecting a shake of an optical axis in an interchangeable lens 8, and from this sensor. It is generally well known that the correction optical system 9 constituted by the entire surface or a part of the photographing optical system 10 is driven in accordance with the output of the imaging optical system 10.

In addition, a shake sensor is provided on the camera body side,
The interchangeable lens has a shake correction optical system, which sends yaw and pitch shake information alternately from the camera body to the interchangeable lens via a single signal line, and the interchangeable lens performs image stabilization based on the transmitted data. An image blur prevention system that performs control has also been proposed in Japanese Patent Application Laid-Open No. 7-191354.

[0004]

However, in an image blur prevention system having a shake sensor on the camera body side and a shake correction system on the interchangeable lens side as described above, control of auto focus (AF) and the like is performed. However, there is a problem that the communication load becomes excessive due to the signals for these controls and the signals for shake correction communicated at regular intervals.

As a means for solving this problem, in the case of a system in which the calculation for image stabilization control and other calculations are performed by the same calculation circuit, a signal from the shake sensor to the calculation circuit in accordance with the operation state of the camera is used. Japanese Patent Application Laid-Open No. Hei 8-6086 discloses an image stabilization system in which the arithmetic circuit can always operate under an appropriate load state by changing the input time interval, and as a result, the communication load also depends on the operation state of the camera. Has been proposed.

However, in this system, although the arithmetic circuit has a margin, the accuracy of the image stabilization control when the communication load is excessive is inevitable.

(Aim of the Invention) A first object of the present invention is to provide a communication system between a main unit and an auxiliary device even when transmission of a drive signal for driving a shake correction system and transmission of other control signals overlap. It is an object of the present invention to provide an optical system capable of preventing an excessive communication load between them and performing shake correction control repeatedly performed at a certain time interval and other control in parallel and smoothly. .

A second object of the present invention is to reduce the communication load between the camera body and the interchangeable lens even when transmission of a drive signal for driving the shake correction system and transmission of other control signals overlap. It is an object of the present invention to provide a camera system capable of preventing the image from becoming excessively large and performing the shake correction control repeatedly performed at a certain time interval and other controls in parallel and smoothly.

[0009]

Means for Solving the Problems In order to achieve the first object, the invention according to claim 1 comprises a main unit and an auxiliary device attached to the main unit, wherein the main unit and An optical system having a communication line for communicating a signal with the attached device, wherein the main body device includes a shake detection unit that detects a shake of an optical axis, and the shake detection unit according to an output of the shake detection unit. Calculating means for calculating a drive signal for driving a shake correction system of the accessory device, wherein the accessory device receives the drive signal of the shake correction system and the shake correction system, and And a vibration correction system driving unit that drives the vibration correction system in accordance with the condition. Optical system Than it is.

[0010] Similarly, in order to achieve the first object,
According to a third aspect of the present invention, there is provided an optical system comprising a main body device and an auxiliary device attached to the main device, and having a communication line for communicating signals between the main body device and the auxiliary device. Wherein the main body device is a shake detecting means for detecting a shake of an optical axis, and a calculating means for calculating a drive signal for driving a shake correction system of the accessory device according to an output of the shake detecting means. And the accessory device comprises:
The image forming apparatus further includes: a shake correction system; and a shake correction system driving unit that receives the drive signal of the shake correction system and drives the shake correction system in accordance with the drive signal, and increases a control signal other than the drive signal. When the communication load of the communication line increases due to the above, the optical system changes the data amount of the drive signal.

In order to achieve the second object,
According to a seventh aspect of the present invention, there is provided a camera system including a camera body and an interchangeable lens attachable to the camera body, and having a communication line for communicating signals between the camera body and the interchangeable lens. The camera body includes a shake detection unit that detects shake of an optical axis, and a calculation unit that calculates a drive signal for driving a shake correction system of the interchangeable lens according to an output of the shake detection unit. Wherein the interchangeable lens has the shake correction system, and a shake correction system driving unit that receives the drive signal of the shake correction system and drives the shake correction system according to the drive signal. When the communication load on the communication line increases due to an increase in control signals other than the drive signal, the camera system changes the transmission interval of the drive signal.

[0012] Similarly, in order to achieve the second object,
According to a ninth aspect of the present invention, there is provided a camera system comprising a camera main body and an interchangeable lens mounted on the camera main body, and having a communication line for communicating signals between the camera main body and the interchangeable lens. The camera body includes a shake detection unit that detects shake of an optical axis, and a calculation unit that calculates a drive signal for driving a shake correction system of the interchangeable lens according to an output of the shake detection unit. Wherein the interchangeable lens has the shake correction system, and a shake correction system driving unit that receives the drive signal of the shake correction system and drives the shake correction system according to the drive signal. When the communication load on the communication line increases due to an increase in a control signal other than the drive signal, the camera system changes the data amount of the drive signal.

[0013]

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 schematically showing a camera system according to a first embodiment of the present invention.

In FIG. 1, a CPU 2 for controlling the entire camera is provided in a camera body 1, and shake sensors 4 and 5 for detecting the shake in the yaw and pitch directions of the entire camera are provided in the camera as shown. The output of the shake sensor is converted into digital data by the A / D converter 3 and taken into the CPU 2 as shake data.

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

In FIG. 2, a vibration gyro 20 is driven by resonance by a driving circuit 22 and a synchronous detection circuit 2
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 includes an unnecessary DC offset. 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 to the OP amplifier 23. , And resistors 26 and 27. Further, the output of this amplifier is an OP amplifier 28, resistors 29 and 30,
And an integration circuit composed of a capacitor 31 and
The output is converted to an output proportional to the shake displacement, and the integrated output is connected to the A / D converter 3 as described above.

Returning to FIG. 1, the shake data captured in the CPU 2 is transferred to the CPU 11 in the interchangeable lens 8 via a normal serial bus line 7 for exchanging information between the camera body 1 and the interchangeable lens 8. You. In the interchangeable lens 8, the outputs of the position detectors 15 and 16 for detecting the absolute position of the correction optical system 9 itself are converted into digital data by an A / D converter 18 and taken into the CPU 11,
Further, the CPU 11 compares the shake data from the camera body 1 with the position data of the correction optical system 9, and transfers the comparison result to the D / A converter 12. The output result from the D / A converter 12 is finally input to the driving circuits 13 and 14, and the correction optical system 9 is driven by the power supplied from the driving circuits.

In FIG. 1, SW1 is a switch that is turned on by the first stroke of the release button, SW2 is a switch that is turned on by the second stroke of the release button, and ISSW is a switch for starting the image stabilizing operation.

Here, a specific configuration of the correction optical system 9 is shown in FIG.

FIG. 3 shows the correction lens as x, y perpendicular to the optical axis.
This shows a configuration of a so-called shift optical system that corrects the angular shake of a camera by performing a parallel shift in the direction.

In FIG. 1, reference numerals 50 and 51 denote yoke portions as magnetic circuit units serving as actual driving sources in the x and y directions, and 52 and 53 denote coil portions corresponding to the respective yoke portions. Accordingly, when current is supplied from the drive circuits 13 and 14 to the coil unit, the correction lens (group) 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 correction lens 54. The movement of the correction lens 54 is based on I
Non-contact detection is performed by a combination of the REDs 56 and 57 and the PSDs 62 and 63 mounted on the lens barrel 60 for holding the entire shift optical system.

Reference numeral 58 denotes a mechanical lock mechanism for mechanically holding the correction lens substantially at the optical axis center when the power supply to the shift optical system is stopped, 59 denotes a charge pin,
Numeral 61 denotes a support ball as an anti-tilt for restricting the falling direction of the shift optical system.

Next, specific control according to the first embodiment of the present invention will be described with reference to flowcharts shown in FIGS. 4 to 7, FIGS. 9 to 11, and a timing chart shown in FIG. I will do it.

FIGS. 4 and 5 show the main flow on the camera body side related to the image stabilization operation.
In step # 100, it is determined whether or not the switch SW1 is ON by the first stroke of the release button. If the switch SW1 is ON, the process proceeds to step # 101 and step # 102, and the power supply voltage is used to assure the operation of the entire camera. It is determined by a battery check circuit (not shown) whether the power supply voltage is sufficient. If it is determined that the power supply voltage is insufficient, the process proceeds to step # 103, where the switch SW
1 is turned off, and when it is detected that the switch SW1 is turned off, it returns to the START position again.

On the other hand, if it is determined in step # 102 that the result of the battery check is OK, step # 104
Then, it is determined whether or not the switch ISSW is turned on. If the switch is turned off, it is determined that the image stabilizing operation is not necessary, and the process proceeds to step # 105.
ISONL inside PU2 is reset to 0, and immediately
To step # 122.

If it is detected in step # 104 that the switch ISSW is ON, it is determined that the anti-shake operation has been selected, and the process proceeds to step # 106.
Then, the lock release command is transferred from the CPU 2 to the CPU 11 via the serial bus line 7.

FIG. 8 is a timing chart showing the state of this command communication. In this figure, SCK is a synchronous clock for serial communication and SDO.
Represents serial data transferred from the camera body to the interchangeable lens side, and SDI represents serial data simultaneously transferred from the lens side to the camera body.

As shown in FIG. 8, when a mechanical lock release command of at least one byte is transmitted from the camera body to the interchangeable lens, a BUSY signal indicating that data has been received is detected from SDI. CP by thing
In U2, it is determined that the mechanical lock release operation has been completed in step # 107 (actually, the mechanical lock release operation is slightly delayed in time, but it can be considered that the release has been completed by the completion of command reception in sequence).

Referring again to FIG. 4, in the next step # 108, the ISIN for determining how many times the sampling of the IS information is performed by the timer interrupt is set to the initial value 1,
In the following steps # 109 and 110, counters TC for counting the number of times of interrupt processing for yaw and pitch, respectively.
Y and TCP are set to initial values 0. Then, in the next step # 111, the Y / P flag for determining which of the yaw and the pitch is the interrupt processing is cleared. After these settings are completed, the process proceeds to step # 112 to start a timer clocking operation for interrupting at regular intervals T, and in the next step # 113, the ISONL in the CPU indicating the anti-vibration operation state is reset. At step # 114, the interruption operation of the timer is permitted.

In steps # 115 and # 116 shown in FIG. 5, the registers UY and UP to be described later are each initialized to 0H. In the next step # 117, photometry for measuring the brightness of the object is performed. Perform the operation. Then, in step # 118, focus control is performed thereafter, and the amount of communication with the interchangeable lens side increases.
2 "to increase the IS information transmission interval. After making this setting, the process proceeds to step # 119, and actual focus control is executed by driving an optical sensor and a focus lens (not shown). This focus control is continued until focus is detected in step # 120. When focus is detected, the process proceeds to step # 121, and the IS information transmission interval is restored by resetting "ISIN = 1".

In the next step # 122, a switch SW2 (not shown) is turned on in accordance with the actual shutter release operation.
It is determined whether or not the camera is turned on, and if it is detected that the camera is turned on, it is determined that the photographer has actually started the release operation, and the process proceeds to step # 123, where the mirror on the camera body side shown in FIG. 6 is performed.

On the other hand, if it is detected in step # 122 that the switch SW2 has not been turned on yet, it is determined that the photographer is still in the framing operation (photographing composition is determined), and the flow proceeds to step # 124. Proceeding, if it is detected that the switch SW1 is still ON, the flow returns to step # 122, and the above operation is repeated.
However, in step # 124, the switch S
When detecting that W1 has been turned off, the CPU 2 determines that the photographer himself has finished taking the image with the camera, and proceeds to step # 125 to determine the contents of the latch ISONL described above. Then, in this step # 125, the IS
When the content of ONL is 0, it is determined that the anti-shake operation has not been performed, and the process immediately returns to step # 100.
If SONL is 1, it is determined that the anti-shake operation has been performed, and the process proceeds to step # 126, where a lock setting command is transmitted. This lock setting command is transmitted from the CPU 2 to the CPU 11 in the same manner as in the timing chart shown in FIG. Then, in step # 127, it is determined whether or not the lock setting is completed. When the lock setting is detected, the process proceeds to step # 128, in which the above-described timer interrupt operation is prohibited, and a series of these operations is ended. .

Next, the control of the interrupt processing operation generated at the above-described fixed period T will be described with reference to the flowchart of FIG.

When an interrupt occurs, first, step # 1
At 30, a determination is made as to whether the current processing is for the yaw direction or the pitch direction, based on the contents of the Y / P flag. If the Y / P flag is 1, step # 141
Then, the process for the pitch direction is started. Steps # 141 to # 150, which are processes in the pitch direction, are the same as steps # 131 to # 140, which are a series of processes in the following yaw direction, and a description thereof will be omitted.

In step # 130, if the Y / P flag is 0, the process in the yaw direction is performed in this interrupt, and the flow advances to step # 131 to increment the yaw direction interrupt counter TCY by one. I do. Then, in the next step # 132, the A / D converter 3 starts converting the output from the yaw direction shake sensor 5 shown in FIG. In the subsequent step # 133, when it is detected that this conversion has been completed, the process proceeds to step # 134, where a predetermined operation is performed on the conversion result.

Here, for this data conversion operation,
The data conversion subroutine shown in FIG. 7 is used.

In the operation of this data conversion subroutine,
First, in step # 150, the contents of the ADDATA register storing the result of the A / D conversion are transferred to the general-purpose operation register A inside the CPU 2, and in the next step # 151
, The data for correcting the individual sensor sensitivities is similarly transferred to the general-purpose operation register B, and finally, the step #
At 152, the two general-purpose operation registers are multiplied, and the result is set in a register C.

Returning to FIG. 6, in the next step # 135,
It is determined whether or not the number of interrupts TCY is equal to the shake data transmission interval ISIN, and if it is determined that they are not equal (if ISIN = 2 and TCY = 1), it is determined that the transmission timing of the IS information has not yet been reached, and step # 1
Proceeding to 40, the Y / P flag is set to 1 to perform processing in the pitch direction at the next interruption, and the interruption ending operation is started.

If it is determined in step # 135 that TCY and ISIN are equal (if ISIN = 1 and if ISIN = 2 and TCY = 2), the process proceeds to step # 136. The content of the operation result is transferred to the transmission data register, and further, step # 137
Starts the actual transmission operation. As a result, ISI
When N is set to 1, shake data is transmitted to the interchangeable lens every time an interruption is performed. When ISIN = 2, the shake data is transmitted to the interchangeable lens side once every two interrupts for the yaw direction processing.

As for the actual method of transmitting the sensor output, as shown in the timing chart of FIG. 8, first, a command indicating the output of the shake sensor is transmitted. Flag is included),
Next, the contents of the register C corresponding to the output of the shake sensor are transferred as serial data of at least one byte. The completion of the data transfer is indicated by step # 1.
If detected at step 38, the yaw direction interrupt counter TCY is reset to 0 in the next step # 139, and the Y / P flag is set to 1 in the following step # 140. Finally, in step # 151, the timer interrupt flag is cleared to 0, the interrupt processing operation ends, and the process returns to the main flow shown in FIG.

As described above, in the processing of the CPU 2, an interrupt occurs at regular intervals T, and the sampling of the yaw and pitch sensor outputs provided in the camera body and the processing for the sampling are alternately performed. Further, the calculation result is transmitted to the interchangeable lens side at every interruption number determined by ISIN.

Next, control on the interchangeable lens side will be described with reference to the flowcharts of FIGS.

First, the flowchart of FIG. 9 shows the main flow of the CPU 11 in the interchangeable lens. First, in steps # 160 and # 161, the internal registers CY and CP for correction calculation for lens control are set to 0H, respectively. Reset. Subsequently, at step # 162, the LCK flag indicating lock setting control is reset to 0, and similarly, at step # 163, the ULCK flag indicating lock release control is reset to 0. Next, in step # 164, after permitting the interrupt operation of the serial interface for receiving the data transmitted from the camera body described above, in step # 165, the lock operation is performed during the serial interface communication interrupt processing described later. It is determined whether or not a command prompting cancellation is received.
If LCK is reset to 0, it is determined that an unlock command has not been received, and the process proceeds directly to step # 168. If ULCK is set to 1, it is determined that an unlock command has been received. Then, the process proceeds to step # 166 to immediately perform the unlocking operation. In this case, a current in a predetermined direction is applied to the plunger 58 in the mechanical lock mechanism shown in FIG. 3 through a mechanical lock driver (not shown) through a control signal from the CPU 11 to release the locking of the correction lens 54. Is done. And
In the next step # 167, the above-mentioned ULCK flag is reset to 0.

In the next step # 168, it is determined whether or not the LCK flag indicating lock setting has been set to 1. If this flag LCK has been reset to 0, it is determined that the lock setting command has not been received. do it,
Returning to step # 165 as it is, LCK
Is set to 1, it is determined that the lock setting command has been received, and the flow advances to step # 169 to immediately perform the lock setting operation. In this case as well, similarly to the above-described unlocking operation, a current is applied to the plunger 58 in the mechanical lock mechanism in the opposite direction to that in the unlocking operation by the control signal from the CPU 11.
The movement of 4 is forcibly stopped by the lever. Finally, in step # 170, the LCK flag is reset to 0, and the process returns to step # 165, and the above-described operation is repeated.

Next, the processing of the serial communication on the interchangeable lens side shown in FIG. 10 will be described.

First, in step # 180, what is the command as the communication content sent from the camera body is interpreted, and in the next step # 181, it is determined whether or not the communication content is the unlock command. Is determined. If it is determined that the command is a lock release command, the process proceeds to step # 182, where a flag ULCK for prompting a lock release operation inside the CPU 11 is set to 1, and immediately step # 200 is performed.
Then, the flag for the serial interrupt is cleared, and this interrupt operation ends.

Therefore, in this case, the unlocking operation is executed in the main flow of FIG. 9 as described above.

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 or not the command is a lock setting command. Proceeding to # 184, the flag LCK for prompting the lock setting command inside the CPU 11 is set to 1, and the process proceeds to step # 200 as in the case where the lock release command is received, and the interrupt operation is ended.

If it is determined in step # 183 that the received command is not a lock setting command, the flow advances to step # 185 to determine whether or not the received data is sensor data in the yaw direction. If it is determined that they match, the process proceeds to step # 186, where the contents of the serial data in the format as shown in the timing chart of FIG. In the next step # 187, the output of the sensor unit 15 (comprising an IRED, a PSD, and a processing circuit) which detects the yaw direction movement of the correction optical system 9 shown in FIG. Starts the operation of converting to digital data. Following step # 188
Then, it is determined whether or not the A / D conversion operation has been completed. If it is determined that the A / D conversion operation has been completed, the process proceeds to step # 189, and the result is determined by the CPU.
11 to the TY register inside. In the next step # 190, the content of the SY register storing the data corresponding to the output from the shake sensor and the content of the TY register storing the data corresponding to the position output of the correction system are matched. The feedback calculation of the yaw correction system is executed, which will be described with reference to the flowchart of FIG.

In FIG. 11, first, in step # 210, the above-mentioned SY register (SP in case of pitch direction)
Register) and TY register (T for pitch direction)
is set again in the SY (or SP) register, and in the next step # 211 the predetermined data LPG for determining the loop gain of the feedback control of the correction optical system 9 is calculated based on the result. , And set the result again in the SY (or SP) register.

The next steps # 212 to # 214 are the flow for executing the phase compensation calculation (in this case, the first-order phase lead compensation) of the correction optical system 9, and the coefficients B1 and A0 used in the flow are used. , A1 are set in advance as predetermined data by known SZ conversion.

More specifically, in step # 212, based on the contents of SY (or SP), the predetermined coefficient data B1 and the operation register CY (or CP) are stored in the registers as values determined at the time of the previous sampling. Is subtracted, and the result is DY (or DP)
Set in the register. In the next step # 213, the predetermined coefficient data A0 and the above DY (or DP
) The predetermined coefficient data A1 and the multiplied value of the CY (or CP) register are added to the multiplied value of the register, and the final result is set in the OY (or OP) register. In the last step # 214, the value of the DY (or DP) register is transferred to the CY (or CP) register for the next calculation, and the feedback calculation of the correction optical system 9 is completed.

Returning to FIG. 10, in step # 191, the value of the OY register, which is the result of the above-described yaw direction correction system feedback operation, is stored in the D / A converter 12 shown in FIG.
To the correction optical system 9 via the drive circuit 13 to drive the correction optical system 9 in the yaw direction based on the output of the yaw direction shake sensor. Become. Upon completion of this control operation, the flow immediately proceeds to step # 200 to terminate this interrupt operation.

If it is determined in step # 185 that the received command is not a yaw sensor data reception command, the flow advances to step # 192 to determine whether the received command is a pitch sensor data reception command. If it is determined that the received data is pitch sensor reception data, steps # 193 to # 198 are executed to control the drive of the correction optical system 9 in the pitch direction. The description is omitted because it is exactly the same as 191.

If it is determined in step # 192 that the received command is not a pitch sensor data reception command, the flow advances to step # 199 to perform normal lens communication (for example, control of focus and aperture). After the end, in step # 200, the serial communication interrupt flag is cleared, and all serial interrupt processing ends.

As described above, in the first embodiment,
The communication interval for transmitting the information (shake data) of the shake sensor provided on the camera body side to the interchangeable lens side alternately in yaw and pitch is during focus control (# 118 in FIG. 5) and when not (# in FIG. 4) 108, # 121) in FIG. 5 to prevent an excessive amount of communication.

In the first embodiment, focus control has been described as an example of a camera operation that temporarily increases the amount of communication. However, other cameras that require communication with the interchangeable lens are required. This processing is also effective in the operation (for example, aperture driving and communication of lens information).

(Second Embodiment) Next, a second embodiment of the present invention will be described. 1 to 3 described in the first embodiment.
Since it is the same as that described above, the description thereof is omitted.

FIGS. 12 and 13 show the main flow including the image stabilizing operation of the camera body according to the second embodiment of the present invention.

In FIG. 12, in step # 300,
It is determined whether or not the switch SW1 is turned on in response to the release start operation, and when it is detected that the switch SW1 is turned on, in steps # 301 and # 302, it is determined whether or not the power supply voltage is sufficient to guarantee the operation of the entire camera system. Is performed by a battery check circuit (not shown), and when it is determined that the power supply voltage is insufficient, the process proceeds to step # 303, where the process waits until the switch SW1 is turned off, and the switch SW1 is turned off. When the event is detected, it returns to the START position again.

On the other hand, if it is determined in step # 302 that the result of the battery check is OK, the process proceeds to step # 3.
04, it is determined whether or not a switch ISSW (not shown) is ON. If it is OFF, it is determined that the image stabilization operation is not required, and the process proceeds to step # 305, where ISONL inside the CPU is reset. The value is reset to 0, and the process immediately proceeds to step # 320 in FIG.

When it is detected in step # 304 that the switch ISSW is turned on, it is determined that the image stabilization operation has been selected, and the flow advances to step # 306 to issue an unlock command to the CPU 11 from the CPU 2. Transfer via line 7 This command communication is the same as that in FIG. 8 described in the first embodiment, and a description thereof will be omitted. And the next step #
When the completion of the unlock operation is confirmed at 307, the process proceeds to step # 308, and the flag ISDA indicating whether or not to change the data amount of the shake data to be transmitted to the interchangeable lens side from the initial value of 2 bytes to 1 byte is cleared to 0. Then, the data amount is set to 2 bytes. Next step # 3
In step 09, the Y / P flag for determining which of the yaw and the pitch is the interrupt processing is cleared.

After these settings are completed, the flow advances to step # 310 to start a timer clocking operation for interrupting at regular intervals T, and in the next step # 311 a CPU indicating that the camera is in a vibration proof operation state. The internal ISONL is set to 1, and the interrupt operation of the timer is permitted in step # 312. Then, step # 31 of FIG.
After the initialization registers UY and UP described later are initialized to 0H in step 3 and step # 314, respectively, in step # 315, a photometric operation for measuring the brightness of the subject is performed. In the following step # 316, focus control is started thereafter, and the communication volume with the interchangeable lens side increases.
A is set to 1, and the amount of shake data to be transmitted is reduced to 1 Byte. After making this setting, the process proceeds to step # 317, and actual focus control is executed by driving an optical sensor and a focus lens (not shown). This focus control is continued until focus can be detected in step # 318, and when focus is detected, step # 319 is performed.
Then, the data amount of the shake information to be transmitted is returned to the original 2 bytes by resetting ISDA to 0.

In the next step # 320, a switch SW2 (not shown) associated with the actual shutter release operation is turned on.
It is determined whether or not the camera has been turned on. When it is detected that the camera is turned on, it is determined that the photographer has actually started the release operation, and the flow advances to step # 321 to execute the mirror 6 of the camera body shown in FIG. Execute the up operation.

On the other hand, if it is detected in step # 320 that the switch SW2 has not yet been turned ON, it is determined that the photographer is still in the framing operation (the photographing composition is determined), and the process proceeds to step # 322. Switch SW
If it is detected that 1 is still ON, the process returns to step # 320 again, and the above operation is repeated. However, in step # 322, the switch SW1
Is turned off, the CPU 2 determines that the photographer has finished photographing himself and proceeds to step # 323 to determine the contents of the latch ISONL described above.
If the content of ISONL is 0, it is determined that the image stabilization operation has not been performed, and the process proceeds to step #.
Returning to 300, if ISONL is 1, it is determined that the anti-shake operation has been performed, and the process proceeds to step # 324,
Here, the lock setting command is transmitted. This lock setting command is transmitted from the CPU 2 to the CPU 11 in the same manner as the above-described lock release command (of course, the data content is different) in the same manner as the timing chart shown in FIG. In the following step # 325, it is determined whether or not the lock setting has been completed. If the lock setting has been detected, the process proceeds to step # 326, where the above-described timer interrupt operation is inhibited, and a series of these operations ends. .

Next, the control on the camera body side of the above-described interrupt processing operation that occurs at every constant period T will be described with reference to FIG.
4 and the flowchart of FIG.

When an interrupt occurs, first, step # 3
At 30, a determination is made as to whether the current processing is for the yaw direction or the pitch direction, based on the contents of the Y / P flag. If the Y / P flag is 1, step # 341
Then, the process for the pitch direction is started. Steps # 341 to # 350, which are processes in the pitch direction, are the same as steps # 331 to # 340, which are a series of processes in the following yaw direction, and a description thereof will be omitted.

If it is determined in step # 330 that the Y / P flag is 0, it is assumed that processing in the yaw direction is performed in this interrupt, and the flow advances to step # 331.
The output from the yaw direction vibration sensor 5 shown in FIG.
The conversion into digital data by the D converter 3 starts. Then, in the next step # 332, when the completion of the conversion is detected, the process proceeds to step # 333, and a predetermined calculation is performed on the conversion result. Here, the data conversion operation is exactly the same as that of the first embodiment (the data conversion subroutine shown in FIG. 7), and the description thereof will be omitted.

Subsequently, in step # 334, the contents of ISDA are determined. If the contents are 0, step # 335 is executed.
Then, the operation result of 2 bytes set in the register C is transferred to the transmission data register.

In step # 334, ISDA
When the content of the register C is 1, in order to reduce the data amount of the shake information to be transmitted to the lens side and reduce the communication load, the content of the register C is reduced to 1 byte by an operation such as lowering the minimum resolution of the image stabilization control. Convert to data and set in register D. In a succeeding step # 337, the contents of the register D are transferred to the transmission data register. Further, in the next step # 338, the actual transmission operation is started according to the timing chart shown in FIG. Here, when the shake data is 1 Byte, the data amount of the shake data received on the interchangeable lens side can be easily determined by using a command different from that used when the shake data is 2 Bytes.

In the next step # 339, it is determined whether or not the transmission of a predetermined number of bytes has been completed. When it is detected that the transmission has been completed, the process proceeds to step # 340 to perform the pitch processing operation by the next interrupt. , Y / P flag is set to 1. Finally, the timer interrupt flag is cleared to 0 to end the interrupt processing operation, and return to the main flow shown in FIG.

The operation on the interchangeable lens side is the same as that described in the first embodiment with reference to FIGS. 9 and 10, and a description thereof will be omitted. The number of bytes of the shake data is determined by the given command. If the shake data is 1 Byte, the actual correction operation is performed after the shake data is converted to the same minimum resolution as when 2 Bytes.

As described above, in the second embodiment, the information (vibration data) of the vibration sensor provided on the camera body is transmitted to the lens side alternately in yaw and pitch, and the data amount is controlled during focus control ( # 316 in FIG. 13 (= 1 Byte)
e)) and when not (# 308 in FIG. 12, ## in FIG. 13)
319 (= 2 Bytes)), thereby preventing an excessive amount of communication.

In this embodiment, focus control has been described as an example of a camera operation that temporarily increases the amount of communication. However, other camera operations that require communication with the interchangeable lens side are also described. This process is also effective.

According to each of the above-described embodiments, the communication interval of information related to image stabilization control or the amount of shake data is determined in consideration of the communication load between the camera body and the interchangeable lens, as shown in FIGS. 108, # 118, # 121) or FIG.
2. By making variable as described in FIG. 13 (# 308, # 316, # 319), it is possible to prevent the communication load from becoming excessive, and to prevent the communication load from being repeated at certain time intervals. The vibration control and other lens control can be performed in parallel and smoothly.

(Modification) In the above embodiment,
An example in which the present invention is applied to a camera system is shown. However, the present invention is not limited to this. A main unit having a shake detecting unit and an auxiliary device having a shake correction system, which has an image stabilizing function and performs data exchange by communication. The present invention can also be applied to an optical system composed of a combination of the above.

[0078]

As described above, according to the first or third aspect of the present invention, even when transmission of a drive signal for driving a shake correction system and transmission of other control signals overlap, An optical system capable of preventing a communication load between a main unit and an attached device from becoming excessive, and performing a shake correction control repeatedly performed at a certain time interval and other controls in parallel and smoothly. It can be provided.

According to the seventh or ninth aspect of the present invention, even when transmission of a drive signal for driving a shake correction system and transmission of other control signals overlap with each other, the camera body and the interchangeable lens can be used. It is possible to provide a camera system capable of preventing the communication load from becoming excessively large, and performing the shake correction control repeatedly performed at certain time intervals and other controls in parallel and smoothly.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a configuration of a shake sensor provided in the camera system of FIG. 1 for detecting angular acceleration.

FIG. 3 is a perspective view showing a specific configuration of a correction optical system provided in the camera system of FIG. 1;

FIG. 4 is a flowchart showing an operation of a main process on the camera body side of the camera system of FIG. 1;

FIG. 5 is a flowchart showing a continuation of the operation in FIG. 4;

FIG. 6 is a flowchart showing an operation of a timer interrupt process on the camera body side of the camera system of FIG. 1;

FIG. 7 is a flowchart showing an operation in a data conversion subroutine process for shake data of the camera system of FIG. 1;

FIG. 8 is a timing chart showing a state of communication performed in the camera system of FIG. 1;

FIG. 9 is a flowchart showing an operation of a main process on the lens side of the camera system of FIG. 1;

FIG. 10 is a flowchart showing an operation of a timer interrupt process on the lens side of the camera system of FIG. 1;

FIG. 11 is a flowchart showing an operation in a correction system feedback calculation subroutine process of the camera system of FIG. 1;

FIG. 12 is a flowchart illustrating an operation of a main process on the camera side of the camera system according to the second embodiment of the present invention.

FIG. 13 is a flowchart showing a continuation of the operation in FIG. 12;

FIG. 14 is a flowchart illustrating an operation of a timer interrupt process on the camera side of the camera system according to the second embodiment of the present invention.

FIG. 15 is a flowchart showing a continuation of the operation in FIG. 14;

FIG. 16 is a diagram showing a configuration of a conventional image blur prevention device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera main body 2 Camera CPU 4, 5 Shake sensor 7 Serial bus line 8 Interchangeable lens 9 Correction optical system 11 Interchangeable lens CPU

Claims (12)

[Claims] 1. An optical system, comprising: a main body device; and an auxiliary device attached to the main device, the optical system having a communication line for communicating a signal between the main device and the auxiliary device, The main body device has shake detection means for detecting shake of the optical axis, and arithmetic means for calculating a drive signal for driving a shake correction system of the accessory device according to an output of the shake detection means, The auxiliary device includes the shake correction system, and a shake correction system driving unit that receives the drive signal of the shake correction system and drives the shake correction system in accordance with the drive signal. An optical system, wherein when the communication load on the communication line increases due to the increase in the control signal, the transmission interval of the drive signal is changed. 2. The optical system according to claim 1, wherein, when a communication load on the communication line increases, a transmission interval of the drive signal is widened. 3. An optical system, comprising: a main body device; and an auxiliary device attached to the main body device, the optical system having a communication line for communicating signals between the main body device and the auxiliary device, The main body device has shake detection means for detecting shake of the optical axis, and arithmetic means for calculating a drive signal for driving a shake correction system of the accessory device according to an output of the shake detection means, The accessory device includes the shake correction system, and a shake correction system driving unit that receives the drive signal of the shake correction system and drives the shake correction system in accordance with the drive signal. An optical system, wherein when the communication load on the communication line increases due to the increase in the control signal, the data amount of the drive signal is changed. 4. The optical system according to claim 3, wherein when the communication load on the communication line increases, the data amount at the time of transmitting the drive signal is reduced. 5. The method according to claim 1, wherein the drive signal is transmitted using different commands before and after the change of the data amount to facilitate determination that the data amount of the drive signal has been changed. Item 5. The optical system according to item 3 or 4. 6. The optical system according to claim 1, wherein the control signal is a signal for focus drive control of a lens included in the accessory device. 7. A camera system comprising a camera body and an interchangeable lens mountable on the camera body, the camera system having a communication line for communicating signals between the camera body and the interchangeable lens, The camera body has shake detection means for detecting shake of the optical axis, and arithmetic means for calculating a drive signal for driving a shake correction system of the interchangeable lens according to an output of the shake detection means, The interchangeable lens includes: the shake correction system; and a shake correction system driving unit that receives the drive signal of the shake correction system and drives the shake correction system in accordance with the drive signal. Wherein the transmission interval of the drive signal is changed when the communication load on the communication line increases due to the increase in the control signal. 8. The camera system according to claim 7, wherein when the communication load on the communication line increases, the transmission interval of the drive signal is widened. 9. A camera system comprising: a camera body; and an interchangeable lens mounted on the camera body, the camera system having a communication line for communicating signals between the camera body and the interchangeable lens, The camera body has shake detection means for detecting shake of the optical axis, and arithmetic means for calculating a drive signal for driving a shake correction system of the interchangeable lens according to an output of the shake detection means, The interchangeable lens includes: the shake correction system; and a shake correction system driving unit that receives the drive signal of the shake correction system and drives the shake correction system in accordance with the drive signal. A data amount of the drive signal is changed when a communication load on the communication line increases due to an increase in the control signal. 10. The camera system according to claim 9, wherein when the communication load on the communication line increases, the data amount at the time of transmitting the drive signal is reduced. 11. The driving signal is transmitted using different commands before and after the change of the data amount to facilitate determination that the data amount of the drive signal has been changed. Item 11. The camera system according to item 9 or 10. 12. The camera system according to claim 7, wherein the control signal is a signal for focusing drive control.