JPH0980530A - Camera system provided with shake correction function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To judge the propriety of shake correction on a body side regardless of the kind of a lens device by detecting the state of power supply voltage from a body device supplied to the lens device and stopping the sequential operation of the camera in the case of voltage impossible to drive an actuator in the lens device. SOLUTION: Constant voltage is supplied to a CPU 11 from a constant- voltage regulator 13 so as to control the series of operation of the camera, and also it communicates with a CPU 21 in a lens 2 through a lens connection contact group 14 when the accessory such as the lens 2 is connected. In the case of judging that the power supply voltage detected by a power supply voltage, detection part is equal to or under a prescribed voltage a body control part instructs a lens control part to restrain or stop the operation of a shake correction driving part through a communication part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera system with a blur correction function for correcting image blur.

[0002]

2. Description of the Related Art In a conventional camera system with interchangeable lenses, a power supply voltage detecting device detects a power supply voltage state for driving camera control after activating a half-press switch for instructing start of photographing preparation.

[0003]

However, in the above-mentioned conventional technique, the predetermined voltage to be compared with the voltage detected by the power supply voltage detecting device in the camera body is constant regardless of the type of the interchangeable lens attached. there were. In this case, when an interchangeable lens that does not have a built-in actuator is attached, it operates without problems, but when an interchangeable lens that has a built-in actuator is attached, the load of the power supply voltage inside the interchangeable lens becomes large and it cannot operate or operates. However, there was a problem that the image stabilization operation could not be performed accurately. Therefore, an object of the present invention is to provide a camera system that can determine whether or not the shake correction drive unit can be operated without any problem on the body device side regardless of the type of the mounted lens device.

[0004]

In order to solve the above-mentioned problems, the invention of claim 1 is a camera system comprising a body device and a lens device detachably attached to the body device. A shooting preparation starting unit that starts preparation for shooting the camera, a body control unit that controls the sequence operation of the camera, and a power supply that supplies a power supply voltage,
The lens device includes a shake correction drive unit that corrects shake,
A lens control section that performs control including driving of the shake correction drive section; a power supply voltage detection section that detects the state of the power supply voltage;
A power supply unit that supplies a power supply voltage from the power source to the shake correction drive unit when the body device and the lens device are coupled, and the body unit and the lens device when coupled. In a camera system including a control unit and a communication unit that communicates with the lens control unit, the body control unit is connected to the lens control unit via the communication unit after the shooting preparation start unit is activated. On the other hand, the power supply voltage detection unit is instructed to detect the power supply voltage.

According to a second aspect of the present invention, in the camera system with a shake correction function according to the first aspect, the body control section is configured such that the power supply voltage detected by the power supply voltage detection section is a predetermined voltage. When the following is determined, the lens control unit is instructed via the communication unit to suppress or stop the operation of the shake correction drive unit.

The invention of claim 3 relates to claim 1 or claim 2.
In the camera system with a shake correction function described in [1], the lens control unit drives the shake correction drive unit when the power supply voltage detection unit detects the power supply voltage.

[0007] The invention of claim 4 is the invention of claims 1 to 3.
The camera system with a shake correction function according to any one of the above items, further comprising a memory unit that stores the predetermined voltage.

[0008]

1 and 2 are views showing a camera system of the present embodiment, FIG. 1 is a schematic diagram, and FIG. 2 is a circuit diagram. This camera system has a camera body 1
And a lens 2 which is detachably attached to the camera body 1. The camera body 1 includes a CPU 11, a battery 12, a constant voltage regulator 13, and a lens connection contact group 14.

The CPU 11 is supplied with a constant voltage from the constant voltage regulator 13 to control a series of operations of the camera and the like, and when an accessory such as the lens 2 is connected, the inside of the lens 2 through the lens connection contact group 14. Can communicate with the CPU 21. The battery 12 is
A voltage is supplied to the CPU 11 that controls the camera body 1 via the constant voltage regulator 13, and power is supplied to an actuator (not shown) in the camera body 11. When an accessory such as the lens 2 is connected, a power supply voltage is supplied into the lens 2 through the lens connection contact group 14. Constant voltage regulator 13
Receives a battery voltage from the battery 12 and supplies a constant voltage to the CPU 11 in the camera body 1 and the CPU 21 in the lens 2. The lens connection contact group 14 connects an electric signal line or the like when the lens 2 or the like is connected.

The lens 2 includes a CPU 21, a motor drive IC 22, a motor 23, and a camera connection contact group 24. The CPU 21 is supplied with a constant voltage from the camera body 1 via the camera connection contact group 24, communicates with the CPU 11 in the camera body 1 via the camera connection contact group 24, and has a motor drive I in the lens 2.
A control signal is transmitted to C22 to drive and control the motor 23. The motor drive IC 22 drives the motor 23 according to a control signal from the CPU 21. Motor 23
Drives an unillustrated AF lens, blur correction lens, etc. by the motor drive IC 22. The camera connection contact group 24 connects an electric signal line or the like when connected to the camera body 1 or the like.

FIG. 3 shows the in-body CPU 11 of this embodiment.
3 is a flowchart showing a main flow of FIG. It is assumed that the power is already turned on, the main switch (not shown) is already turned on, and the process is started from S300. First, in S301, the CPU inside the camera body 1
The inside of 11 is initialized. Next, the process goes around the loop of S302 and S303, and waits for a half-press switch (not shown) to be turned on in S302 or for the main switch to be turned off in S303. In S303, if the main switch is off, the process proceeds to S305 to end the process. After that, it waits for the main switch to turn on again. When the main switch is turned on, the process is started again from S300. If the half-push switch is turned on in S302, the process proceeds to S304 to call the photographing process.

FIG. 4 is a flow chart showing a photographing process of the CPU 11 in the body. When it is confirmed that the half-push switch is turned on, the process starts from S400. First, S4
At 01, the battery is checked inside the body 1 to determine whether or not there is a sufficient battery voltage for sequence control. If not enough, the process returns from S404 to the flowchart of FIG. In this case, the shooting sequence is not performed.

In S401, if there is a sufficient battery voltage for performing the sequence control in the body 1,
In step S402, serial transfer is performed to instruct the lens 2 to determine whether the battery voltage supplied from the camera body 1 is sufficient to drive the motor 23 in the lens 2 (transfer). The command number is "1".).

In S403, it is determined whether or not the lens BC flag, which is the result of the voltage check on the lens 2 side, is "1". If it is not 1, the voltage that can drive the motor 23 in the lens 2 is determined. Since it is not in the level, the process returns from S404 to the flowchart of FIG. Also in this case, the shooting sequence is not performed.

In step S403, the lens BC flag is set to 1
If it is, it means that the voltage level is such that the motor 23 in the lens 2 can be driven.
5, the CPU 21 in the lens is instructed to start the angular velocity detection circuit (not shown) in the lens 2 by serial transfer (the command number to be transferred is "2").

After that, in step S406, photometry processing is executed, and in next step S407, distance measurement processing is executed. The distance of the subject is calculated from the distance measurement result, and the drive destination of the photographing lens is determined. In step S408, the AE calculation is performed based on the photometric result obtained in step S406 to determine the shutter opening time. In step S409, parameters necessary for performing blur correction, such as exposure time, are serially transferred from the in-body CPU 11 to the in-lens CPU 21 (the command number to be transferred is “3”), and in the next step S410.
The focusing lens is driven based on the distance measurement data in S407.

After that, in S411, it is confirmed whether the release switch (not shown) is on or off.
In step 412, the state of the half-push switch is confirmed, and if it is on, the process returns to step S406. That is, in the half-pushed state (the half-push switch is on), S406, S407,
It is in a state where the loop of S408, S409, S410, S411, and S412 is running.

If it is detected in S412 that the half-push switch is off, the process proceeds to S413, in which the CPU in the lens is
21 is instructed to stop the angular velocity detection circuit by serial transfer (the command number to be transferred is "4"). After that, the driving of focusing is stopped in S414, and the process returns from S415 to the flowchart of FIG. In this case, shooting is not performed.

When it is confirmed in S411 that the release switch is turned on, the process proceeds to S501 in FIG. 5, and the driving of focusing is stopped. In the next step S502, a centering operation for moving the shake correction lens from the reset position to the center of the optical axis is instructed by serial transfer (the command number to be transferred is "5"). Further, S50
In 3, the CPU 21 in the lens is instructed to start the blur correction process by serial transfer (the command number to be transferred is “6”).

In S503 and thereafter, the CPU 1 in the body
The CPU 1 in the lens executes the shake correction process in parallel with the process of 1 performed by the flowchart of FIG. Next, the process proceeds to S504, the shutter opening process is executed, and S50
In step 5, the shutter closing process is executed.

Then, in S506, the in-lens C
The PU 11 is instructed to stop the blur correction process by serial transfer (the command number to be transferred is “7”). Further, in S507, the stop of the angular velocity detection circuit is instructed by serial transfer (the command number to be transferred is "4"). Next, in step S508, an instruction to move the blur correction lens to the reset position is instructed by serial transfer (the command number to be transferred is "8"). Finally, after the film winding process is executed in S509, the process returns from S510 to the flowchart of FIG.

FIG. 6 is a flowchart showing the overall processing of the CPU 21 in the lens. S600 by turning on the power
The process starts from step S601, and the inside is initialized in step S601. After that, in S602, the CPU 11 waits for a serial request from the in-body CPU 11. If there is a serial request, the process proceeds to S603, the receiving process with the in-body CPU 11 is performed, and it is determined in S604 whether the command number is 1.

If the command from the in-body CPU 11 is "1", the flow advances to S605 to call the flow chart of the lens BC process in FIG. Wait for serial transfer again.

In S604, if the command from the in-body CPU 11 is not "1", the flow proceeds to the next S606, it is determined whether the command from the in-body CPU 11 is "2", and if YES, The angular velocity detection circuit is activated in step S607, and the process returns to step S602 to wait for the serial request again.

If the command from the in-body CPU 11 is not "2" in S606, the process proceeds to the next S608, it is determined whether the command from the in-body CPU 11 is "3", and if "YES", After the data reception process from the in-body CPU 11 is performed in S609, S62 is performed.
At 0, the transmission process for ending the data reception process is performed, and the process returns to S602 to wait for the serial transfer again.

If the command from the in-body CPU 11 is not "3" in S608, the process proceeds to the next S610, and it is determined whether or not the command from the in-body CPU 11 is "4". The angular velocity detection circuit is stopped in step S611, and the process returns to step S602 to wait for serial transfer again.

If the command from the in-body CPU 11 is not "4" in S610, the process proceeds to the next S612, and it is determined whether or not the command from the in-body CPU 11 is "5". After the centering process of moving the center of the blurring correction lens to the optical axis is performed in S613, the transmission process for finishing the blurring correction lens centering process is performed in S620, and the process returns to S602 to wait for the serial transfer again.

If the command from the in-body CPU 11 is not "5" in S612, the process proceeds to the next S614, and it is determined whether or not the command from the in-body CPU 11 is "6". The blur correction process is started in step S615, and the process returns to step S602 to wait for serial transfer again.

In S614, if the command from the in-body CPU 11 is not "6", the flow proceeds to the next S616, it is determined whether or not the command from the in-body CPU 11 is "7", and if YES, The blur correction process is stopped in S617, and the process returns to S602 to wait for the serial transfer again.

In S616, if the command from the in-body CPU 11 is not "7", the process proceeds to the next S618, it is determined whether the command from the in-body CPU 11 is "8", and if YES, After performing a reset process of moving the shake correction lens to the initial reset position in S619, a transmission process of ending the shake shake correction lens reset process is performed in S620, and the process returns to S602 to wait for serial transfer again.

FIG. 7 is a flow chart showing the battery check process (hereinafter referred to as "BC process") on the lens side of the present embodiment. When it comes to lens BC processing, FIG.
The process starts from S700. First, in S701, as a load for performing BC, the shake correction lens is reset driven, the lens BC flag is reset to 0 in S702, the process proceeds to the next S703, and it is determined whether the power supply voltage is higher than a predetermined reference voltage. Make a decision. If high, S70
4, the lens BC flag is set to 1, and S70
Go to 5.

If it is determined in S703 that the power supply voltage is lower than the predetermined reference voltage, the lens BC flag is left as it is and the process proceeds to S705. In step S705, the reset driving of the shake correction lens is stopped, and then the flow returns from step S706 to the shooting processing flow.

As described above, according to the present embodiment, it is not possible to detect the state of the power supply voltage from the body device supplied to the lens device and drive the actuator in the lens device in the lens device having the shake correction function. If the voltage is possible, the sequence operation of the camera is stopped.

[0034]

As described above, according to the first aspect, since the power supply voltage detection unit of the lens device is instructed to detect the power supply voltage after the shooting preparation start unit is activated,
It is possible to determine whether or not the power supply voltage is sufficient depending on the lens device mounted.

According to the second aspect, when it is determined that the power supply voltage detected by the power supply voltage detection unit is equal to or lower than the predetermined voltage, the operation of the shake correction drive unit is suppressed or stopped. Therefore, the other sequences of the camera can be controlled normally.

According to the third aspect of the present invention, when the power supply voltage detection unit detects the power supply voltage, the shake correction drive unit is driven, so the load on the lens device side can be accurately detected.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a camera system according to the present invention.

FIG. 2 is a circuit diagram showing an embodiment of a camera system according to the present invention.

FIG. 3 is a flowchart showing a process of an in-body CPU 11 of this embodiment.

FIG. 4 is a flowchart showing a photographing process of the in-body CPU 11 of the present embodiment.

FIG. 5 is a flowchart showing a photographing process of the in-body CPU 11 of the present embodiment.

FIG. 6 is a flowchart showing the processing of the in-lens CPU 21 of the present embodiment.

FIG. 7 is a lens BC of the in-lens CPU 21 of the present embodiment.
It is a flowchart which shows a process.

[Explanation of symbols]

 1 Camera Body 2 Lens 11 CPU in Camera Body 12 Battery in Camera Body 13 Constant Voltage Regulator in Camera Body 14 Lens Connection Contact Group in Camera Body 21 CPU in Lens 22 Motor Drive IC in Lens 23 Motor in Lens 24 Camera Connection Contact Group in Lens

Claims (4)

[Claims] 1. A camera system comprising a body device and a lens device detachably attached to the body device, wherein the body device comprises a photographing preparation starting section for starting preparation for photographing of the camera, and a sequence operation of the camera. A lens control unit for controlling blurring, and a lens control unit for performing control including driving of the blurring correction driving unit. A power supply voltage detection unit that detects a state of a power supply voltage; a power supply unit that supplies a power supply voltage from the power supply to the shake correction drive unit when the body device and the lens device are combined; A camera system including: a communication unit that communicates between the body control unit and the lens control unit when a device and the lens device are coupled to each other; Control unit, after the photographing preparation start unit is activated, via the communication unit, to the lens control unit,
A camera system with a shake correction function, which instructs the power supply voltage detection unit to detect a power supply voltage. 2. The camera system with a shake correction function according to claim 1, wherein the body control unit determines that the power supply voltage detected by the power supply voltage detection unit is equal to or lower than a predetermined voltage. At this time, the camera system with a shake correction function is configured to instruct the lens control unit to suppress or stop the operation of the shake correction drive unit via the communication unit. 3. The camera system with a shake correction function according to claim 1, wherein the lens control section drives the shake correction drive section when the power supply voltage detection section detects the power supply voltage. A camera system with a shake correction function that is characterized by: 4. Any one of claims 1 to 3
The camera system with a shake correction function according to the above item 1, further comprising a memory unit that stores the predetermined voltage.