JP4756789B2 - Image stabilization system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in an image blur correction system in which a main body device is provided with a shake detection unit and an accessory device is provided with an image blur correction unit.
[0002]
[Prior art]
Conventionally, an interchangeable lens type camera vibration-proof lens is known. Japanese Patent Application Laid-Open No. 6-250272 and Japanese Patent Application Laid-Open No. 7-191355 have examples in which image blur detection means for detecting image blur is provided on the camera side and image blur correction means for correcting image blur is provided on the interchangeable lens side. And the like.
[0003]
In the camera disclosed in the above publication, the control data communication between the camera and the interchangeable lens always receives the exchange data of the interchangeable lens by exchanging a predetermined amount of data, and transmits the control data. In this way, the image blur correction unit is driven.
[0004]
[Problems to be solved by the invention]
However, in the conventional example, the control data amount communicated between the optical device such as the camera and the optical device such as the interchangeable lens is set to a predetermined amount, and the control data amount is set in accordance with the maximum shake correction amount. When set, when the amount of shake is small, control data more than necessary is exchanged between the optical device, and waste occurs.
[0005]
When the control data amount is set with respect to the standard shake amount, the image shake correction unit may not be completely driven when a large shake amount is detected.
[0006]
(Object of invention)
A first object of the present invention is to provide an image blur correction system capable of performing appropriate image blur correction control corresponding to the blur amount.
[0007]
The second object of the present invention is to perform image blur correction capable of performing appropriate image blur correction control corresponding to the shake amounts in the pitch and yaw directions while minimizing an increase in the amount of control data with respect to the shake amount. Is to provide a system.
[0008]
[Means for Solving the Problems]
In order to achieve the first object, the present invention provides an image blur correction system comprising a combination of a main body device and an accessory device, wherein the main body device is communicated from the shake detection means and the accessory device. An image blur correction unit that calculates a drive signal for image blur correction based on a signal related to the image blur correction and a detection output of the blur detection unit, and the auxiliary device corrects the image blur. And drive control means for controlling the drive of the image blur correction means in accordance with the drive signal communicated from the main body apparatus, including the drive signal communicated from the main body apparatus to the accessory device. Per communication An image blur correction system in which the amount of control data is variable according to the detection output of the blur detection means.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on illustrated embodiments.
[0013]
FIG. 1 is a configuration diagram of a camera system including a camera (camera body) and an interchangeable lens according to each embodiment of the present invention.
[0014]
In FIG. 1, the camera 1 is provided with a CPU 2 for controlling the camera side, and shake sensors 4 and 5 for detecting the yaw and pitch shakes of the camera 1 are arranged as shown in the figure. Both sensor outputs are converted into digital data by the A / D converter 3 and are taken in as data in the CPU 2.
[0015]
An example of a specific configuration inside the shake sensors 4 and 5 includes a vibration gyro as an angular velocity sensor and an integration circuit as shown in FIG.
[0016]
In FIG. 2, the vibration gyro 20 is resonantly driven by a drive circuit 22 and its output is converted by a synchronous detection circuit 21 or the like so as to obtain a predetermined angular velocity output. The output from the synchronous detection circuit 21 usually includes an unnecessary DC offset, and this DC component is removed by a high-pass filter composed of a capacitor 24 and a resistor 25, and only the remaining shake signal is an operational amplifier 23, It is amplified by an amplifier composed of resistors 26 and 27. Further, the output of this amplifier is integrated by an integrating circuit composed of an operational amplifier 28, resistors 29, 30 and a capacitor 31, and converted into an output proportional to the deflection displacement. This integrated output is converted to the A / D converter 3 as described above. It is the structure which is output to.
[0017]
Returning to FIG. 1, the sensor output taken into the CPU 2 becomes a shake correction lens driving amount calculated based on information from the interchangeable lens 8. Then, the data of the shake correction lens driving amount is transferred from the CPU 2 to the CPU 11 in the interchangeable lens 8 via the normal serial bus line 7 for exchanging information between the camera 1 and the interchangeable lens 8. The CPU 2 detects the posture of the camera by inputting posture detection outputs from the posture detection sensors 19a and 19b.
[0018]
In the interchangeable lens 8, the output of the position detection sensors 15 and 16 for detecting the absolute position of the shake correction system 9 itself is converted into digital data by the A / D converter 18 and is taken into the CPU 11. The shake correction lens driving amount data from the camera 1 and the position of the shake correction system 9 are compared, and the comparison result is transferred to the D / A converter 12. Based on the output result from the D / A converter 12, the shake correction system 9 is driven via the driver circuits 13 and 14 to correct the image blur.
[0019]
Here, a specific configuration example of the shake correction system 9 is shown in FIG.
[0020]
FIG. 3 shows a configuration of a so-called shift optical system that corrects the angular shake of the camera by parallelly shifting the shake correction lens in the x and y directions perpendicular to the optical axis. Are yoke sections as magnetic circuit units that are actual drive sources in the x- and y-axis directions, and 52 and 53 are coil sections corresponding to the respective yokes. Therefore, when the 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.
[0021]
The movement of the shake correction lens 54 is determined by a combination of IREDs 56 and 57 that move integrally with the shake correction lens 54 and PSDs 62 and 63 that are mounted on the lens barrel 60 for holding the entire shift lens. Detected non-contact. 58 denotes a mechanical lock mechanism for mechanically holding the shake correction lens 54 at the optical axis center when the power supply to the shift system is stopped, 59 is a charge pin, and 61 is this shift. Each support ball is shown as a tilt stop for regulating the direction of the system toppling.
[0022]
(First embodiment)
Next, with respect to the operation of the main part according to the first embodiment of the present invention, the flowcharts shown in FIGS. 4, 5, 6, 8, 9, and 10, the timing chart shown in FIG. Will be used to explain.
[0023]
FIG. 4 shows the main processing in the CPU 2 of the camera 1 related to the image stabilization (image blur correction) operation. In FIG. 4, first, in step # 99, a switch for instructing the start of the release operation of the camera 1 It is determined whether or not SW1 is ON. If it is ON, in step # 100 and step # 101, it is determined whether or not the power supply voltage is sufficient for the operation guarantee voltage of the entire camera. Run by circuit. As a result, if it is determined that the power supply voltage is insufficient, the process proceeds to step # 102, where it waits until the switch SW1 is turned off, and returns to the start position when the switch SW1 is turned on.
[0024]
On the other hand, if it is determined in step # 101 that the result of the battery check is OK, the process proceeds to step # 103, and communication with the CPU 11 in the interchangeable lens 8 is performed to perform photometry calculations such as photometry, distance measurement, and full aperture value. Data to be used, data for focus adjustment such as focus adjustment sensitivity, and data corresponding to the image stabilization sensitivity are obtained. Here, the anti-vibration sensitivity is, as described above, the ratio of the drive amount of the shake correction lens to the tilt amount of the apparatus, and changes depending on the zoom and focus states. Step # in FIG. 151 is used for the calculation executed at 151. In this embodiment, zoom information is used as data corresponding to the image stabilization sensitivity. As a method of transmission / reception, when a predetermined data request signal is transmitted from the camera 1 to the interchangeable lens 8, the interchangeable lens 8 side responds to the predetermined data request signal and data corresponding to the image stabilization sensitivity. The zoom information is transmitted to the camera 1 side.
[0025]
Next, in step # 104, normal photometric operation is performed, and in subsequent step # 105, actual focus control is executed by driving the focus lens by communication with an optical sensor (not shown) and the CPU 11. This focus control is continued until it can be detected in step # 106 that the in-focus state can be detected. If the in-focus state can be detected, the process proceeds to step # 107 to determine whether or not the anti-vibration start switch ISSW is ON. If the switch ISSW is OFF, it is determined that the image stabilization operation is not necessary, 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.
[0026]
On the other hand, if it is determined in step # 107 that the switch ISSW is ON, the process proceeds to step # 109 on the assumption that the image stabilization operation is selected, and the lock release command is exchanged from the CPU 2 on the camera 1 side. The data is transferred to the CPU 11 on the lens 8 side via the serial bus line 7.
[0027]
Here, the state of the command communication is shown in the timing chart of FIG. 7. In FIG. 7, SCK is a synchronous clock for serial communication, SDO Is the serial data transferred from the camera 1 to the interchangeable lens 8 side, SDI Is serial data simultaneously transferred from the interchangeable lens 8 side to the camera 1 side.
[0028]
As shown in FIG. 7, when a mechanical lock release command of at least 1 byte or more is transmitted from the camera 1 to the interchangeable lens 8, a BUSY signal indicating that data has been received is detected from the SDI. In CPU 2, it is determined in step # 110 that the mechanical lock releasing operation has been completed (actually, the mechanical lock releasing operation is delayed a little more in time, but it can be considered that the release of the command has been completed in sequence). Then, the process proceeds to the next step # 111, where a timer for interrupting every predetermined period T is reset to start a new timing operation, and in the subsequent step # 112, the CPU 2 indicating that the image stabilization operation state is set. The internal flag ISONL is set to 1, and the timer interrupt operation is permitted in the next step # 113.
[0029]
In the next step # 114 and step # 115, calculation registers UY and UP, which will be described later, are each initially set to 0H. Thereafter, the process proceeds to step # 116, where the switch SW2 provided in the camera 1 associated with the actual shutter release operation. If it is ON, it is determined that the photographer has started the actual release operation, and the process proceeds to step # 117, and the mirror 6 in the camera 1 shown in FIG. Then, the shutter release operation is executed.
[0030]
On the other hand, if it is detected in step # 116 that the switch SW2 is not yet turned on, it is determined that the photographer is still in the framing operation (the shooting composition is determined), and the process proceeds to step # 118. It is determined whether SW1 is ON. If it is ON, the process returns to step # 116 and the above operation is repeated. If it is detected in step # 118 that the switch SW1 is turned off, the CPU 2 proceeds to step # 119 on the assumption that the photographer has finished photographing with the camera, and determines the contents of the flag ISONL. . If the content of the flag ISONL is 0, the process immediately returns to step # 99 assuming that the image stabilization operation has not been executed, but if the flag ISONL is 1, the process proceeds to step # 120 assuming that the image stabilization operation has been executed. Proceed and send the lock setting command here. This lock setting command is transmitted from the CPU 2 to the CPU 11 in the same manner as the timing chart shown in FIG.
[0031]
In the next step # 121, it is determined whether or not the above-described lock setting has been completed. If it is determined that the lock setting has been completed, the process proceeds to step # 122, in which the above-described timer interrupt operation is prohibited and these series of operations are prohibited. This completes the operation.
[0032]
Next, the interrupt processing operation that occurs every predetermined period T will be described with reference to the flowchart of FIG.
[0033]
5, first, in step # 130, an operation of converting the output from the yaw direction shake sensor 5 shown in FIG. 1 into digital data by the A / D converter 3 is started. Then, when it is detected in the next step # 131 that the conversion operation has been completed, the process proceeds to step # 132, where it is determined whether or not the shake sensor output value is equal to or greater than a predetermined value. As a result, if it is determined that the sensor output value is equal to or greater than the predetermined value, the process proceeds to step # 134. Control data amount increase flag Is set and the process proceeds to step # 135. If it is determined in step # 132 that the shake sensor output value is within the predetermined value, the process proceeds to step # 133. Reference data amount transmission flag Is set and the process proceeds to step # 135.
[0034]
In step # 135, a predetermined calculation is performed on the conversion result in step # 130. Here, the data conversion operation will be described with reference to a “data conversion” subroutine shown in FIG.
[0035]
In the “data conversion” subroutine of FIG. 6, 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 arithmetic register A in the CPU 2, and in the next step # 151. The data corresponding to the image stabilization sensitivity indicating the relationship between the “shake sensor output” and the “correction lens driving amount” transmitted from the CPU 11 in the interchangeable lens 8 (or “the amount of image movement on the image plane”). In this embodiment, data corresponding to the image stabilization sensitivity reflecting the already set zoom state is received. Similarly, the data is transferred to the general-purpose arithmetic register B in the CPU 2, and in the subsequent step # 152, the CPU 2 performs multiplication between the two general-purpose arithmetic registers and sets the result in the register C. That. The data corresponding to the anti-vibration sensitivity transferred to the general-purpose arithmetic 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 will be described later. Therefore, the calculation using the latest anti-vibration sensitivity is possible at each time point of the above calculation. Thereafter, the process returns to step # 136 of FIG.
[0036]
In step # 136 of FIG. 5, the content of the above calculation result is transferred to the transmission data register C, and in the subsequent step # 137, the transmission operation from the actual camera 1 to the interchangeable lens 8 is started. As shown in the timing chart of FIG. 7, the lens drive amount data transmission method first transmits a command indicating the output of the shake sensor (of course, this command includes a command for determining yaw, pitch, etc.). 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. By receiving this signal, the interchangeable lens 8 side transmits data corresponding to the image stabilization sensitivity at that time to the camera 1 side as described later (step # 186 in FIG. 9 described later).
[0037]
Here, in the first embodiment, in the image blur correction control based on the output of the shake sensor, the control data amount is appropriately changed and sent according to the detected shake amount. For example, if the reference data amount is 2 bytes, a timing chart as shown in FIG. 11 can be considered. When the camera shake amount is small, the control data amount is reduced to 1 byte as in the timing chart shown in FIG. 12, and when the camera shake amount is large, the timing chart shown in FIG. Thus, changes such as increasing the amount of control data to 3 bytes are performed.
[0038]
In addition to the number of data bytes, by changing the communication clock with respect to the timing chart shown in FIG. 11, the amount of control data communicable per unit time can be reduced as in the timing chart shown in FIG. It is also possible to change and configure so that more control data can be communicated.
[0039]
Further, as shown in FIGS. 17A and 17B, the amount of control data that can be communicated may be changed by changing the interval of control data transmitted and received. FIG. 17B shows a case where the control interval is extended with respect to FIG. Specifically, when the shake amount is large, the control response is improved by controlling at short intervals as shown in FIG. 17A, and when the shake amount is small, as shown in FIG. 17B. In addition, by increasing the interval, it is possible to reduce the control load on the camera, and it is possible to transmit and receive control data optimal for the camera shake amount.
[0040]
Returning to FIG. 5, when it is detected in step # 138 that the data transfer of the shake correction lens driving amount has been completed, in the future, in step # 139, an A / D conversion operation for the sensor output in the pitch direction is started. To do. Steps # 139 to # 147, which are data transmission processing of the shake correction lens driving amount in the pitch direction, are exactly the same as the processing for the sensor output in the yaw direction (steps # 130 to # 138), and the description thereof is omitted. . Finally, in step # 148, the timer interrupt flag is set to 0, the interrupt processing operation ends, and the process returns to the main process in FIG.
[0041]
In this way, an interruption occurs at a constant period T in the processing of the CPU 2, and the latest data output of the shake correction lens driving amount in the yaw and pitch directions provided in the camera 1 is transmitted to the interchangeable lens 8 side each time. Will be.
[0042]
Next, the operation on the interchangeable lens 8 side will be described with reference to the flowcharts of FIGS.
[0043]
First, main processing in the CPU 11 on the interchangeable lens 8 side will be described with reference to the flowchart of FIG.
[0044]
In steps # 160 and # 161 in FIG. 8, correction calculation internal registers CY and CP for lens control are reset to 0H, respectively. In subsequent step # 162, the LCK flag indicating lock setting control is set to 0. Similarly, in step # 163, the ULCK flag indicating lock release control is set to 0. In the next step # 164, the interrupt operation of the serial interface for receiving the data transmitted from the camera 1 described above is permitted, and in step # 165, the lock release is first performed in the serial interface communication interrupt process described later. If the flag ULCK is 0, it is determined that the unlock command has not been received, and the process proceeds to step # 168. On the other hand, if the flag ULCK is set to 1, it is determined that the unlock command has been received, the process proceeds to step # 166, and the unlock operation is immediately performed. In this case, in accordance with a control signal from the CPU 11, a current in a predetermined direction is supplied to the plunger 58 in the mechanical lock mechanism shown in FIG. 3 via a mechanical lock driver (not shown) to correct the shake of the shift lens. The locking of the lens 54 is released. In the next step # 167, the above-described flag ULCK is set to 0.
[0045]
In the next step # 168, 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 returns to step # 165 as it is. However, if the flag LCK is 1, it is determined that a lock setting command has been received, and the process proceeds to step # 169 to immediately perform a lock setting operation. In this case as well, similar to the above-described unlocking operation, a current is applied to the plunger 58 in the mechanical lock mechanism in the opposite direction to the unlocking operation in response to a control signal from the CPU 11, and the movement of the shake correction lens 54 is performed. Is forcibly stopped by a lever. Finally, in step # 170, the flag LCK is set to 0, the process returns to step # 165 again, and the above-described operation is repeated.
[0046]
Next, serial communication processing on the interchangeable lens 8 side will be described with reference to the flowchart of FIG.
[0047]
First, in step # 180, the command as the communication content sent from the camera 1 side is deciphered, and in the next step # 181, it is determined whether or not this 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 in the CPU 11 is set to 1, and the process immediately proceeds to step # 200, where the flag for serial interrupt is set. Set to 0 to end this interrupt operation. Therefore, in this case, as described above, the unlocking operation is executed in the main process of FIG.
[0048]
On the other hand, if it is determined in step # 181 that the command is not a lock release command, the process proceeds to step # 183, where it is determined whether or not it is a lock setting command. The flag LCK for prompting the lock setting command is set to 1, and the process proceeds to step # 200 in the same manner as when the lock release command is received to end the interrupt operation.
[0049]
If it is determined in step # 183 that the command is not a lock setting command, the process proceeds to step # 185, where it is determined whether the data is a shake correction lens drive amount data in the yaw direction. Here, the received command is a yaw correction lens drive. If it coincides with the command for receiving the quantity, the process proceeds to step # 186 to set the contents of the serial data in the format as shown in the timing chart of FIG. Data corresponding to image stabilization sensitivity indicating the relationship between "output" and "correction lens drive amount" (or image stabilization sensitivity indicating the relationship between "image movement amount on the image plane" and "correction lens drive amount") To the camera 1 side. 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.
[0050]
In the next step # 187, the output of the position detection sensor 15 (comprising IRED, PSD, and processing circuit) that detects the movement of the shake correction system 9 shown in FIG. The converter 18 starts an operation of converting into digital data, and in the next step # 188, it is determined whether or not the A / D conversion operation is completed. 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 in the CPU 11. The following step # 190 is performed so that the contents of the SY register storing data corresponding to the output from the position detection sensor 15 and the TY register storing 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.
[0051]
As soon as this control operation ends, the process proceeds to step # 200, and this interrupt operation ends.
[0052]
On the other hand, if it is determined in step # 185 that the command is not a command for receiving yaw correction lens driving amount data, the process proceeds to step # 192, where it is determined whether or not the command is a command for receiving lens shake correction lens driving amount data. If the pitch correction lens drive amount reception data is determined, the steps # 193 to # 198 are executed, and the drive control of the shake correction system 9 in the pitch direction is performed. Since this is exactly the same as the drive control in the yaw direction (steps # 186 to # 191), the description thereof will be omitted.
[0053]
If it is determined in step # 192 that the command is not a pitch shake correction lens drive amount data reception command, the process proceeds to step # 199, and normal lens communication (for example, focus and aperture control, photometry, distance measurement, anti-vibration sensitivity) is performed. In step # 200, the serial communication interrupt flag is cleared and all serial interrupt processes are completed.
[0054]
As described above, in the first embodiment of the present invention, the camera 1 side receives data corresponding to the image stabilization sensitivity from the interchangeable lens 8 side as needed while the image stabilization operation continues. The latest shake correction lens drive amount is calculated based on the data and the detection output of the shake sensor, and this is transmitted to the interchangeable lens 8 side alternately as yaw and pitch, and the latest shake correction lens drive amount is exchanged on the interchangeable lens 8 side. Every time it is received, the shake correction system 9 is controlled.
[0055]
Then, by making the control data amount communicated between the camera 1 and the interchangeable lens 8 variable, it is possible to perform image blur correction control with accuracy according to the blur amount, and always perform optimal image blur correction. It becomes possible.
[0056]
Here, the example which changed a part of FIG. 4 in the said 1st Embodiment is demonstrated using FIG. Since the difference from FIG. 4 is only step # 400 and step # 401, only this portion will be described here.
[0057]
In step # 400 of FIG. 10, data used for photometric calculation such as an open aperture value and data for focus adjustment such as focus adjustment sensitivity are obtained. Then, the photometry operation is performed in the next step # 104, and the focus adjustment operation is performed in steps # 105 and # 106. Then, in the next step # 401, the image stabilization sensitivity reflecting both the setting state of the zoom lens and the setting state of the focus lens when the in-focus state is obtained is obtained. As a method of transmission / reception, when a predetermined data request signal is transmitted from the camera 1 to the interchangeable lens 8, the interchangeable lens 8 side responds to the predetermined data request signal and data corresponding to the image stabilization sensitivity. As shown, the image stabilization sensitivity reflecting both the setting state of the zoom lens and the setting state of the focus lens when the in-focus state is obtained is transmitted toward the camera 1 side.
[0058]
As described above, by using data corresponding to the anti-shake sensitivity after focusing for calculating the shake correction lens driving amount, it is possible to perform a shake correction operation with higher accuracy.
[0059]
The data corresponding to the setting state of the zoom lens and the data corresponding to the setting state of the focus lens are transmitted as different data from the interchangeable lens 8 to the camera 1 side, and they are integrated on the camera 1 side. You may make it form anti-vibration sensitivity, and exchange data corresponding to anti-vibration sensitivity that integrates both data corresponding to the setting state of the zoom lens and data corresponding to the setting state of the focus lens. It may be formed on the lens 8 side and transmitted to the camera 1 in that form.
[0060]
(Second Embodiment)
Next, with respect to the operation of the main part according to the second embodiment of the present invention, the flowcharts shown in FIGS. 4, 15, 6, 6, 9, 10 and the timing chart shown in FIG. Will be used to explain. The description of the flowcharts shown in FIGS. 4, 6, 8, 9, and 10 and the timing chart shown in FIG. 7 has been described in the first embodiment. Omitted.
[0061]
Hereinafter, with reference to FIG. 15, a camera posture detection and shake correction subroutine and the like according to the second embodiment of the present invention will be described.
[0062]
In the posture detection subroutine, first, in step # 301, the outputs of the camera posture detection sensors 19a and 19b are detected. Then, in the next step # 302, it is determined which shake sensor is the shake sensor in the pitch direction based on the outputs of the posture detection sensors 19a and 19b. If it is determined that the first shake sensor is a shake sensor in the pitch direction, the process proceeds to step # 303, the first shake sensor is set as a shake sensor in the pitch direction, and the shake sensor is set in the next step # 305. The output of is detected. On the other hand, if it is determined in step # 302 that the second shake sensor is a pitch direction shake sensor, the process proceeds to step # 304, the second shake sensor is set as the pitch direction shake sensor, and the next step In step # 305, the output of the shake sensor is detected.
[0063]
In the next step # 306, A / D conversion of the shake sensor set in the pitch direction is started, and in subsequent step # 307, A / D conversion of the shake sensor output set in the yaw direction is started. And next step # 308 To determine whether or not the A / D conversion of the shake sensor set in the pitch direction and the shake sensor output set in the yaw direction has been completed, and the shake sensor output set in the pitch direction and the shake sensor set in the yaw direction If it is determined that the output A / D conversion has been completed, the process proceeds to step # 309.
[0064]
In step # 309, it is determined whether or not the shake sensor output set in the pitch direction and the shake sensor output set in the yaw direction are equal to or greater than a predetermined value. As a result, if it is determined that the shake sensor output set in the pitch direction and the shake sensor output set in the yaw direction are less than or equal to a predetermined value, the process proceeds to step # 310, and the reference data amount transmission flag is set. Then, the process proceeds to step # 315, and control of the shake sensor set in the yaw direction is started.
[0065]
On the other hand, if it is determined that the shake sensor output set in the pitch direction and the shake sensor output set in the yaw direction in step # 309 are greater than or equal to a predetermined value, the process proceeds to step # 311. Control data amount increase flag In the next step # 312, the shake sensor output set in the pitch direction and the output of the shake sensor output set in the yaw direction are compared, and the shake sensor output set in the pitch direction is the shake set in the yaw direction. It is determined whether or not the sensor output is large. If it is determined that the shake sensor output set in the pitch direction is large, the process proceeds to step # 313, and a control data amount increase flag in the pitch direction is set. Thereafter, the process proceeds to step # 315 to start control of the shake sensor output set in the yaw direction. If it is determined that the shake sensor output set in the pitch direction is smaller than the shake sensor output set in the yaw direction, the process proceeds to step # 312 to set the control data amount increase flag in the yaw direction and Set the control data amount increase flag. Thereafter, the process proceeds to step # 315 to start control of the shake sensor output set in the yaw direction.
[0066]
In the next step # 316, a predetermined calculation is performed on the conversion result in step # 307. Here, this data conversion operation is performed by the “data conversion” subroutine shown in FIG. Then, in the next step # 317, the content of the above calculation result is transferred to the transmission data register C, and in the subsequent step # 318, the transmission operation from the actual camera 1 to the interchangeable lens 8 is started. As shown in the timing chart of FIG. 7, the shake correction lens drive amount data transmission method first transmits a command indicating the output of the shake sensor (of course, this command includes the discriminating of yaw, pitch, etc.). 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. By receiving this signal, the interchangeable lens 8 side transmits data corresponding to the image stabilization sensitivity at that time to the camera 1 side as described later (step # 186 in FIG. 9).
[0067]
Here, in the second embodiment, in the image blur correction control based on the output of the shake sensor, the control data amount in the pitch direction is appropriately set to be equal to or larger than the control data amount in the yaw direction according to the detected shake amount. Changed and sent. For example, if the reference data amount is 2 bytes, a timing chart as shown in FIG. 11 can be considered. When the camera shake amount in the pitch direction is large, the control data amount in the pitch direction is increased to 3 bytes as shown in the timing chart of FIG.
[0068]
In addition to the number of data bytes, by changing the communication clock with respect to the timing chart shown in FIG. 11, the amount of control data communicable per unit time can be reduced as shown in the timing chart shown in FIG. Further, based on the timing chart shown in FIG. 17, by setting the transmission interval of the control data in the pitch direction to be shorter than the transmission interval of the control data in the yaw direction, communication of the control data in the pitch direction is further improved. It is possible to increase the pitch direction and to make fine control in the pitch direction.
[0069]
Returning to FIG. 15, when it is detected in step # 319 that the data transfer of the shake correction lens driving amount is completed, control of the sensor output in the pitch direction is started in step # 320. With respect to steps # 320 to # 324, which is data transmission processing of the shake correction lens driving amount in the pitch direction, the shake sensor in the yaw direction in which the conversion result in step # 307 is replaced with the conversion result in step # 306. Since it is exactly the same as the process for output (steps # 316 to # 319), its description is omitted. Finally, in step # 325, the timer interrupt flag is set to 0, the interrupt processing operation ends, and the process returns to the main process in FIG.
[0070]
With the above configuration, the camera and lens are improved while improving the accuracy of shake correction by setting the emphasis on shake correction control in the pitch direction, which has a high probability of occurrence of shake regardless of the posture of the camera. It is possible to minimize the increase in the amount of control data communicated between them, and to effectively utilize the limited amount of communication data.
[0071]
Further, since the amount of communication data can be reduced, it is not necessary to increase the communication speed so much that it can be configured at low cost.
[0072]
(Modification)
In each of the embodiments described above, a shake sensor composed of a vibration gyroscope is assumed as the shake detection means, but other angular velocity sensors and other sensors (displacement, angular displacement sensor, velocity sensor, acceleration, angular acceleration sensor, etc.) An area sensor or the like may be used.
[0073]
Further, as the image blur correction unit, the one that performs the image blur correction by moving the optical member in a plane substantially perpendicular to the optical axis is used, but other image blur correction unit such as a variable apex angle prism is used. May be used.
[0074]
In each of the above-described embodiments, an example in which the present invention is applied to a silver salt camera has been described. However, the present invention can be similarly applied to other imaging devices such as a video camera and other optical devices.
[0075]
【The invention's effect】
As explained above, The present invention Accordingly, it is possible to provide an image blur correction system capable of performing appropriate image blur correction control corresponding to the shake amount.
[0076]
Also, The present invention According to the present invention, it is possible to provide an image shake correction system capable of performing appropriate image shake correction control corresponding to the shake amounts in the pitch and yaw directions while minimizing an increase in the amount of control data with respect to the shake amount. It is.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a camera system according to each embodiment of the present invention.
2 is a circuit diagram showing a specific configuration of shake sensors 4 and 5 shown in FIG. 1; 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 side according to each embodiment of the present invention.
FIG. 5 is a flowchart showing timer interrupt processing on the camera side in the first embodiment of the present invention.
FIG. 6 is a flowchart showing a detailed operation in step # 135 of FIG.
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 of the interchangeable lens according to each embodiment of the present invention.
FIG. 9 is a flowchart showing the operation of serial interrupt processing in the interchangeable lens according to each embodiment of the present invention.
10 is a flowchart showing an example in which a part of the flowchart shown in FIG. 4 is changed.
FIG. 11 is a diagram for explaining a standard control data amount in communication in the camera system according to the first embodiment of the present invention.
FIG. 12 is a diagram for explaining the control data amount when the shake amount in communication in the camera system according to the first embodiment of the present invention is small.
FIG. 13 is a diagram for explaining a control data amount when a shake amount is large in communication in the camera system according to the first embodiment of the present invention.
FIG. 14 is a diagram for explaining a communication speed when a shake amount in communication in the camera system according to the first embodiment of the present invention is large.
FIG. 15 is a flowchart showing the operation of timer interrupt processing on the camera side in the second embodiment of the present invention.
FIG. 16 is a diagram for explaining a control data amount when a shake amount in the pitch direction is large in communication in the camera system according to the second embodiment of the present invention.
FIGS. 17A and 17B are diagrams for explaining communication intervals when the shake amount is large and small in communication in the camera system according to each embodiment of the present invention. FIGS.
[Explanation of symbols]
1 Camera
2 CPU
4,5 Runout sensor
8 Interchangeable lens
9 Shake correction system
11 CPU
19a, 19b Attitude detection sensor

Claims (7)

An image stabilization system comprising a combination of a main device and an accessory device,
The main unit includes a shake detection unit, and a calculation unit that calculates a drive signal for image blur correction based on a signal relating to image blur correction communicated from the accessory device and a detection output of the shake detection unit. Have
The accessory device includes an image blur correcting unit that corrects an image blur, and a drive control unit that controls driving of the image blur correcting unit in accordance with the drive signal communicated from the main body device.
An image blur correction system characterized in that the amount of control data per communication including the drive signal communicated from the main unit to the accessory device is variable according to the detection output of the blur detection means. The shake detection means detects a shake in the yaw direction and pitch direction of the main body device,
The calculating means is a signal for correcting the image blur and the drive signal for the yaw direction for the image shake correction based on the signal relating to the image shake correction communicated from the accessory device and the detected output in the pitch direction and the yaw direction of the shake detecting means. To calculate
The drive control means controls the drive of the image blur correction means according to the pitch direction and yaw direction drive signals communicated from the main body device,
The amount of control data in the pitch direction and yaw direction including the pitch direction and yaw direction drive signals communicated from the main body device to the accessory device is determined by the pitch direction and yaw direction detection outputs of the shake detection means. The image blur correction system according to claim 1, wherein the image blur correction system is variable. Drive signal of the pitch and yaw directions are image blur correcting system according to claim 2, characterized in that the transmission alternating pitch and yaw directions is performed.   4. The image blur correction according to claim 1, wherein the control data amount is increased with respect to a reference data amount when an output of the shake detection unit is equal to or greater than a predetermined value. 5. system.   The image blur correction system according to claim 1, wherein the shake detection unit includes a vibration gyro.   The image blur correction system according to claim 1, wherein the image blur correction unit includes a shift type correction optical system.   The image blur correction system according to claim 1, wherein the main body device is a camera, and the accessory device is an interchangeable lens.

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