JPH0980529A - Shake correction camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately judge the capacity of a battery in the case a high current is fetched when shake correction control is performed. SOLUTION: This camera is provided with a shake detection part for detecting shake acting on the camera, a shake correction mechanism part for changing the optical axis of a photographing optical system in order to correct image blurring due to the shake, a control part (master CPU 114, etc.) controlling the shake correction mechanism part based on an output signal from the shake detection part, and a battery check part (master CPU 114, battery check circuit 127, etc.) for performing the battery check of a power source for driving the shake correction mechanism part when a signal indicating the completion of exposure is received.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blur correction camera capable of correcting image blur caused by camera shake or the like in the camera.

[0002]

2. Description of the Related Art A camera shake caused by a camera is detected by an angular velocity sensor or the like, and the photographing optical system is moved in a direction opposite to the detected blur direction to change the optical axis of the photographing optical system. A shake correction camera capable of correcting image shake is known (Japanese Patent Laid-Open No. 2-183217, etc.). FIG. 4 is a block diagram showing an example of a shake correction circuit of a conventional shake correction camera. The camera includes a camera body 54 and a photographing lens 55 that are electrically connected. In the camera body 54, a (DC / DC) converter 2, a CPU 3 and the like are provided. On the other hand, in the taking lens 55, the (DC / DC) converter 16, C
A PU 12, a CPU 17, etc. are provided.

The battery 1 is loaded in the camera body 54 and supplies power to the camera body 54 and the taking lens 55. The camera body 54 and the taking lens 55 are electrically connected by electrical contacts 6, 7, 8, 9, and 10. The electric contact 6 is provided from the battery 1 via the power supply control switch 4 which is a semiconductor switch to the photographing lens 55.
Is a contact for supplying power to. The electrical contact 7 is a contact for supplying the output of the converter 2 to the taking lens 55. The electrical contacts 8 are a group of contacts for performing communication between the CPU 3 and the master CPU 12. The electrical contact 9 is a GND (ground) line connected to the cathode terminal of the battery 1. The electrical contact 10 is a GND line that is grounded to the metal object of the camera body 54.

The switches 5a and 5b are turned on at the first stroke and the second stroke of the release button of the camera, respectively.
It is a switch for N. When the switch 5a becomes 0N, C
The L level is input to the terminal HAN of PU3. When the switch 5b is turned on, the terminal RLS of the CPU3 is set to L
The level is entered.

The CPU 3 mainly controls the inside of the camera body 54. When the L level is input to the terminal HAN, the CPU 3 controls the start-up of the converter 2 and supplies power to the master CPU 12 and the EEPROM 13 (electrically rewritable non-volatile memory) via the electrical contact 7. Further, the master CPU 12 outputs a power supply request signal for the electric contact 6 to the CPU 3 via the electric contact 8. The CPU 3 controls the power supply control switch 4 from the battery 1.
Power is supplied to the converter 16 from the electrical contact 6.

When power is supplied from the electrical contact 7, the master C
The PU 12 activates the converter 16. Converter 1
6 is a constant voltage regulator circuit 18 and a slave CPU 1
7. Power is supplied to the control circuits of the motor drivers 20 and 23. The constant voltage regulator circuit 18 supplies power to the shake detection circuit and the analog processing circuit 19. Analog processing circuit 1
In the case of 9, since the dynamic range of the signal component is large, the power supply of the processing circuit must also have a low noise level. Here, if the output of the converter 16 is directly used, the noise level is not sufficiently low due to the characteristic that this power supply is a switching power supply. Therefore, power is supplied to the circuit that performs analog processing via the constant voltage regulator circuit 18.

The switches 14a and 14b are 2-bit setting switches for selecting the image blur correction control mode. When the switch 14a is ON, the L level is input to the terminal D1 of the master CPU 12. When the switch 14b is ON, the master CPU1
The L level is input to the second terminal D2.

FIG. 5 shows switches 14a (terminal D1), 1
4 shows the relationship between the setting of 4b (terminal D2) and the correction mode. Switch 14a is L level (ON), switch 1
When 4b is at H level (OFF), the mode is set to perform the correction operation only during the exposure. Also, the switch 14a
Is at the H level and the switch 14b is at the L level, the mode is set to perform the correction operation during the exposure and other than during the exposure. Furthermore, when both the switches 14a and 14b are at the H level, the mode in which the correction operation is not performed is set.

The blur amount detected by the analog processing circuit 19 is analog-processed and input to the master CPU 12. When the image blur correction mode is set to a mode in which the correction operation is performed other than during exposure (when only the switch 14b is ON), when the switch 5a is turned ON, the master CPU 12 is subjected to analog processing. The amount to drive the motors 21 and 24 is calculated based on the data and transmitted to the slave CPU 17. Slave CPU1
7 outputs the amount to be driven to the motor drivers 20 and 23, and drives the motors 21 and 24.

The motors 21 and 24 convert a rotational movement into a linear movement by a gear or the like (not shown) and drive a correction optical system (not shown). Position detection circuits 22 and 25
Detects the position of the correction optical system due to the rotation of the motors 21 and 24. The position detection circuits 22 and 25 know the deviation from the control amount by the feedback pulse from the photo interrupter element or the like, for example.

When the image blur correction mode is set to a mode in which the correction operation is performed only during exposure (switch 14
In the case where only a is ON), when the switch 5b is turned ON, the correction optical system is driven only during the exposure. The master CPU 12 converts the voltage of the electrical contact 6 into the converter 1
6 is activated and is consuming current (monitoring is performed by terminal AN2, battery check (BC) 27). When this voltage value is lower than a predetermined value, a warning is issued or control is stopped. The resistance 11 is a low resistance provided so that the potential difference with the electric contact 10 does not become large when the motors 21 and 24 rotate and a large current flows into the electric contact 9.

[0012]

However, the above-described conventional blur correction camera has the following problems. The voltage of the battery 1 is monitored when the converter 16 consumes current. In this method, the voltage is monitored while the battery 1 is in a stable state. Therefore, it is possible to accurately detect the voltage of the battery 1 in a fatigued state before heat generation is stopped, such as immediately after a large current is taken out from the battery 1 when a plurality of actuators are simultaneously driven during shake correction control. could not. An object of the present invention is to accurately determine the capacity of a battery when a large current is taken out during shake correction control.

[0013]

In order to solve the above-mentioned problems, the invention of claim 1 provides a blur detection unit for detecting a blur acting on a camera, and an image pickup for correcting an image blur caused by the blur. A shake correction mechanism section that changes the optical axis of the optical system, a control section that controls the shake correction mechanism section based on the output signal of the shake detection section, and the shake correction mechanism when the exposure completion signal is received. And a battery check unit for checking a battery of a power source for driving the correction mechanism unit.

According to a second aspect of the present invention, in the blur correction camera according to the first aspect, the control section suppresses or prohibits the drive of the blur correction mechanism section based on the voltage value of the power source by the battery check section. It is characterized by doing.

[0015]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a power supply system of an image stabilization camera according to the present invention. The block diagram of the blur correction control system is the same as that of the conventional example shown in FIG. The battery 103 is provided in the camera body 101 and supplies power to the camera body 101, the taking lens 102, and the like. Camera body 101
And the taking lens 102 are electrically connected to each other by electrical contacts 108, 109, 1
It is electrically connected by 10 and 111.

The electrical contact 108 is a contact for supplying power from the battery 103 to the photographic lens 102 side via the power supply control switch 106 which is a semiconductor switch. Electrical contact 1
Reference numeral 09 indicates (body DC / DC) in the camera body 101.
It is a contact for supplying the output of the converter 105 to the photographing lens 102 side. The electrical contacts 110 are a group of contacts for communicating between the CPU 104 in the camera body 101 and the master CPU 114 in the taking lens 102. The electrical contact 111 is a GND line connected to the cathode terminal of the battery 103.

The switches 107a and 107b are switches which are turned on by the first stroke and the second stroke of the release button of the camera, respectively. Switch 107a is O
Then, the L level is input to the terminal HAN of the CPU 104. When the switch 107b is turned on, the CPU1
The L level is input to the terminal RLS 04.

The CPU 104 performs main control in the camera body 101. CPU 104 terminal HA
By inputting the L level to N, the converter 10
5 start control, master CP via electrical contact 109
Power U114. At this point, the master CPU 11
4 indicates the voltage of the electrical contact 108 by the battery check circuit 1
The voltage is monitored by dividing the voltage with resistors R5 and R6 in 27.
Further, when the master CPU 114 outputs the power supply request signal of the electric contact 108 to the CPU 104 via the electric contact 110b, the battery 103 supplies the lens DC / DC (lens DC / DC) in the photographing lens 102 via the power supply control switch 106 and the electric contact 108. ) Supply power to converter 117. Electrical contact 1
When the power is supplied from 09, the master CPU 114
Starts the converter 117 by the power supply control 2. The converter 117 supplies power to the slave CPU 120.

When the exposure is performed on the camera body 101 side, the CPU 104 detects a signal indicating that the exposure is completed based on the shutter operation and the like. And the CPU 104
Outputs a signal that the exposure is completed to the master CPU 114 via the electric contact 110a.

FIG. 2 is a diagram for explaining the state of the voltage of the battery 103 during the battery check in the present invention. In the figure, (a) shows the conventional one, and (b) shows the present invention. In (a) of the figure, a monitor voltage is applied to a terminal AN2 monitored by the master CPU 12 while the converter 16 (FIG. 4) is activated. The battery check is performed while the battery is consumed (battery check 27).

On the other hand, in (b) in the figure, the battery check is performed in the state where the voltage of the battery 103 (FIG. 1) has dropped immediately after the shake correction control sequence is completed (battery check circuit 127). In this state as well,
With the converter 117 activated, the master CPU 1
The monitor voltage is applied to the terminal monitored by 14, and the battery check is performed while the converter 117 is consuming current from the battery 103. This is because the voltage is restored by the voltage restoration effect of the battery 103 itself with the passage of time,
This is because the battery check is performed before the voltage is restored in the state where the battery 103 is fatigued (immediately after receiving the exposure completion signal).

FIG. 3 is a flow chart showing an embodiment of the control of the blur correction camera according to the present invention. First, in step A2, when the correction start trigger is turned on while waiting for the trigger signal for starting the shake correction control, step A
3, the battery check is performed to determine whether or not the output voltage value BC1 of the battery 103 is larger than a predetermined reference value (reference). When the output voltage value BC1 is not larger than the reference value, the standby state is maintained until it becomes larger. When the output voltage value BC1 is larger than the reference value, the process proceeds to step A4, and the CPU 104 determines that the master CPU1
A command for blurring correction control is issued to 14. This causes the slave CPU 120 to perform the step S
A subroutine "image blur correction control" which is a process of UB1 (steps B1 to B5) is called. Step SUB1
In step B1, the blurring at that time is detected, and in step B2, the output is analog-processed. And
In the next step B3, the correction amount is calculated after A / D conversion, and in the next step B4, the drive control of the correction optical system is performed, and the process returns.

At the next step A5, it is judged whether or not the exposure completion signal is transmitted. If it has not been transmitted, the process returns to step SUB1. When the exposure completion signal is sent,
That is, when the exposure completion signal is input to the master CPU 114 from the electrical contact 110a, it indicates that the image capturing for the shake correction control is completed. Therefore, in the next step A6, the battery check is performed to determine the output voltage value of the battery 103. The output voltage value BC1 is monitored and the predetermined reference value (ref
(rence) is larger than this. If it is larger, the process returns to step A2 and waits for a trigger signal to start the shake correction control. If it is not larger, the process ends in step A7. This is because the system operation cannot be guaranteed in the future even if any load is driven.

When the exposure is completed, compared to during the exposure, the CPU
The work of the control circuit and the control circuit is small, so it is suitable for checking the battery. Furthermore, immediately after the completion of exposure, the battery 1
Since 03 is in a fatigued state, even when the converter 117 consumes a current, a difference appears in the monitor voltage immediately after the heavy load driving and when not. Then, by grasping the state in which the battery 103 is fatigued, it can be reflected in the subsequent control. For example, when the output voltage value of the battery check is low, driving of the shake correction mechanism unit is controlled (driving is suppressed or prohibited).

Among various controls of the camera, the heavy load is mainly driving of the motor (actuator). In particular, the inrush current at the time of starting the motor is a heavy burden on the battery 103 that is a power source. Examples of the drive that increases the inrush current include servo drive that repeats forward rotation, reverse rotation, and braking. In a camera, driving of an auto focus motor, a shake correction motor, etc. can be mentioned. In particular, the shake correction motor drives and controls two motors at one time in order to correct the two axes of yaw and pitch on a plane. That is, at the time of shake correction,
The load on the battery 103 of the camera becomes particularly large. Therefore, in the present invention, the battery check is performed immediately after the end of the shake correction drive with the largest load.

[0026]

According to the first aspect of the present invention, since the battery check is performed immediately after the exposure is completed, it is possible to grasp the voltage value when the power source is the most exhausted and reflect it in the subsequent control. it can. According to the second aspect of the present invention, the drive of the shake correction mechanism unit is suppressed or prohibited based on the voltage value obtained by the battery check, so that the system down of the camera can be prevented in advance.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a power supply system of an image stabilization camera according to the present invention.

FIG. 2 is a battery 10 at the time of checking the battery according to the present invention.
It is a figure explaining the mode of the voltage of 3rd.

FIG. 3 is a flowchart showing an embodiment of control of the image stabilization camera according to the present invention.

FIG. 4 is a block diagram showing an example of a shake correction circuit of a conventional shake correction camera.

FIG. 5 shows switches 14a (terminal D1) and 14b (terminal D).
The relationship between the setting of 2) and the correction mode is shown.

[Explanation of symbols]

 101 camera body 102 taking lens 103 battery 104 CPU 105 converters 108, 109, 110, 111 electrical contacts 114 master CPU 117 converter 120 slave CPU 127 battery check circuit

Claims (2)

[Claims] 1. A shake detection unit for detecting a shake acting on a camera, a shake correction mechanism unit for changing an optical axis of a photographing optical system to correct an image shake caused by the shake, and an output of the shake detection unit. A control unit that controls the shake correction mechanism unit based on a signal; and a battery check unit that performs a battery check of a power source that drives the shake correction mechanism unit when an exposure completion signal is received. A characteristic image stabilization camera. 2. The blur correction camera according to claim 1, wherein the control unit suppresses or prohibits driving of the blur correction mechanism unit based on a voltage value of a power source by the battery check unit. An image stabilization camera.