JP2003195381A - Interchangeable lens and photographing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interchangeable lens inhibiting a rapid decrease in a power-supply voltage, conducting stable power supply protection operation, and capable of conducting stable operation even for a high-function lens having a motor for driving the lens and a jiggle correcting unit or the like, and a photographing device. <P>SOLUTION: The interchangeable lens is provided with a microcomputer 110 for controlling a driving control circuit 161 for an AF driving motor and a driving control circuit 162 for a camera shake correcting-motor, and a resetting circuit 150 for resetting the microcomputer 110 when the power-supply voltage decreases below a prescribed voltage. The interchangeable lens is provided with a power-supply voltage detector 120 for detecting the power-supply voltage besides the resetting circuit 150, and a comparator A 141 and a comparator B 142 for comparing output generated from the power-supply voltage detector 120 with a previously determined set value A and a previously determined set value B, respectively. A plurality of low-voltage measuring processes providing priority to the microcomputer 110 is selectively applied in accordance with comparison results obtained from the comparator A 141 and the comparator B 142. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interchangeable lens such as a silver salt camera, a digital still camera, a video camera and an image pickup device.

[0002]

2. Description of the Related Art Conventionally, in this type of interchangeable lens and image pickup apparatus, particularly in an interchangeable lens equipped with an autofocus (hereinafter referred to as AF) motor, the power source voltage is detected, and the power source voltage falls below a predetermined value. A control method is sometimes known in which the speed of the AF motor is reduced or stopped. A reset circuit that monitors the power supply of a microcomputer and resets when the power supply voltage drops is often used in a circuit using a microcomputer.

[0003]

However, in the above-described conventional interchangeable lens and image pickup system, for example, in a high-performance interchangeable lens having a lens driving motor and a shake correction device, the power supply voltage supplied from the camera body is reduced. There is a problem in that it is difficult to perform control for suppressing a drop in the power supply voltage so that the microcomputer does not reset due to a sudden change.

An object of the present invention is to prevent a sharp drop in the power supply voltage, perform a stable power supply protection operation, and perform a stable operation even in a high-performance lens having a lens driving motor, a shake correction device, and the like. It is an object of the present invention to provide an interchangeable lens and an imaging device capable of performing the above.

[0005]

The present invention solves the above-mentioned problems by the following means for solving the problems. It should be noted that, for ease of understanding, reference numerals corresponding to the embodiments of the present invention will be given and described, but the present invention is not limited thereto. That is, according to the invention of claim 1, a photographing optical system, a blurring correction optical system that forms at least a part of the photographing optical system, and corrects a blur on an imaging surface of a photographing device, and an image obtained by the photographing optical system. Focusing drive section (161,
171, 261, 271) and a shake correction drive unit (162, 172, 26) for driving shake correction optical systems.
2, 272), a control unit (110, 210) for controlling the focusing drive unit and the shake correction drive unit, and the control unit when the power supply voltage supplied to the control unit is below a predetermined value. Reset circuit that outputs a reset signal to (15
0, 250), voltage detection means (120, 220) for detecting the power supply voltage separately from the reset circuit, and at least two comparisons for comparing the output of the voltage detection means with a predetermined value. Means (141, 142, 21
0,242) and a low-voltage handling processing unit (110, 210) that selectively performs a plurality of low-voltage handling processes with a predetermined priority according to the comparison result of the comparison means. It is an interchangeable lens.

According to a second aspect of the present invention, in the interchangeable lens according to the first aspect, the comparison means includes the A / D converter for converting an analog signal of the voltage detection means into a digital signal, and the comparison means is provided in the control section. It is formed by a first comparing means (210) for making a comparison with a predetermined value and an analog circuit outside the control unit and capable of making a comparison with the predetermined value faster than the first comparing means. And a second comparison means (242) which is provided.

According to a third aspect of the present invention, in the interchangeable lens according to the second aspect, the low voltage handling process is a power consumption reduction process performed according to a comparison result of the first comparing means (210), and And an interruption process performed according to the comparison result of the second comparison means (242).

According to a fourth aspect of the present invention, in the interchangeable lens according to the third aspect, the power consumption reduction process is performed by changing a driving condition of the focusing drive section (261, 271). A process for reducing the power consumption of the unit, and the interrupt process is a process for stopping the operation of the focusing drive unit and / or the shake correction drive unit (262, 272). It is a lens.

The invention of claim 5 is claim 3 or claim 4.
In the interchangeable lens according to the item 1, the power consumption reduction process includes a process of reducing an operation speed of the focusing drive unit (261, 271) according to a comparison result of the first comparison unit (210). The interchangeable lens is characterized by comprising a plurality of processes provided with.

According to a sixth aspect of the present invention, there is provided a photographing optical system, a blur correction optical system that forms at least a part of the photographing optical system, and corrects a blur on an image pickup surface of a photographing device, and the photographing optical system. A focusing drive unit (1 for performing focusing drive of an image
61, 171, 261, 271) and a shake correction drive unit (162, 17) for driving the shake correction optical system to perform shake correction.
2, 262, 272), a control unit (110, 210) that controls the focusing drive unit and the shake correction drive unit, and the power supply voltage supplied to the control unit is equal to or less than a predetermined value. A reset circuit (150, 250) that outputs a reset signal to the control unit, and a voltage detection unit (120, 220) that detects the power supply voltage separately from the reset circuit.
And at least two comparing means (141, 14) for comparing the output of the voltage detecting means with a predetermined value.
2, 210, 242) and a plurality of low-voltage handling processing units (110, 21) that selectively perform a plurality of low-voltage handling processes provided with predetermined priorities according to the comparison result of the comparing means.
0) and a power supply unit that supplies electric power.

According to a seventh aspect of the present invention, in the image pickup apparatus according to the sixth aspect, the comparing means includes the A / D converter for converting the analog signal of the voltage detecting means into a digital signal, and the comparing means in the control section. It is formed by a first comparing means (210) for making a comparison with a predetermined value and an analog circuit outside the control unit and capable of making a comparison with the predetermined value faster than the first comparing means. And a second comparison means (242) which is provided.

According to an eighth aspect of the present invention, in the image pickup apparatus according to the seventh aspect, the low-voltage handling process is a power consumption reduction process performed according to a comparison result of the first comparing means (210), and And an interrupt process performed according to the comparison result of the second comparing means (242).

According to a ninth aspect of the present invention, in the photographing apparatus according to the eighth aspect, the power consumption reduction process is performed by changing the drive condition of the focus drive section (261, 271). Image capturing, which is a process for reducing the power consumption of the unit, and the interrupt process is a process for stopping the operation of the focusing drive unit and / or the shake correction drive unit (262, 272). It is a device.

According to a tenth aspect of the present invention, in the photographing apparatus according to the eighth or ninth aspect, the power consumption reduction process is performed in accordance with the comparison result of the first comparing means (210). The image capturing apparatus is characterized by comprising a plurality of processes having priorities including a process of reducing the operation speed of the drive units (261, 271).

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in more detail below with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram showing an outline of an interchangeable lens 100 used in a photographing apparatus according to the present invention.
FIG. 1A shows the entire interchangeable lens 100, and FIG.
(B) is a block diagram showing an internal configuration of the DC / DC converter 130. The image capturing apparatus according to the first embodiment detects vibration of the image capturing apparatus body or the lens barrel due to camera shake, and accordingly drives a part of the image capturing lens (shake correction optical system) in a direction orthogonal to the optical axis. This is a so-called single-lens reflex camera system in which the interchangeable lens 100 that corrects blurring and the interchangeable lens 100 is attachable to and detachable from a camera body (not shown) that is an image pickup apparatus body. The lens barrel 100 according to the present embodiment includes a microcomputer 110 and a power supply voltage detector 1
20, DC / DC converter 130, comparator A1
41, comparator B142, reset circuit 150, A
An F drive motor drive control circuit 161, a camera shake correction motor drive control circuit 162, an AF motor 171, a correction motor 172, and the like are provided.

The microcomputer 110 is a control unit which is provided inside the interchangeable lens 100 and controls various operations in the interchangeable lens 100.

The power supply voltage detector 120 has a power supply input Vin.
It is a voltage detecting means for detecting the power supply voltage value input to. The power supply voltage detector 120 always detects the power supply voltage value while the camera body is powered on, and the detection result of the power supply voltage value is input to the comparator A 141 and the comparator B 142.

The DC / DC converter 130 converts the voltage of the power input Vin supplied from the camera body into the AF motor 1.
A converter for boosting the voltage required to drive 71 and the voltage required to drive the correction motor 172, the operation of which is controlled by the microcomputer 110. As shown in FIG. 1B, the DC / DC converter 130 includes an input protection circuit 1
31, DC / DC external control circuit 132, booster circuit 13
3, 134, output protection circuits 135, 136, current detectors 137, 138, a comparator 139 and the like.

Input protection circuit 131 and output protection circuit 13
Reference numerals 5 and 136 are circuits that protect the internal circuit when an excessive voltage such as static electricity is applied.

The DC / DC external control circuit 132 is a control circuit for controlling the booster circuits 133 and 134 according to the instruction of the microcomputer 110.

The booster circuits 133 and 134 are circuits which are controlled by the DC / DC external control circuit 132 and boost the input voltage to a voltage required to drive the AF motor 171 and the correction motor 172.

The current detectors 137 and 138 are portions for detecting the current used to drive the AF motor 171 and the correction motor 172, and the detection result is transmitted to the comparator 139.

The comparator 139 includes current detectors 137 and 13
8 is a part for comparing the currents detected by 8 and transmitting to the DC / DC external control circuit 132 which of these has a larger current value.

Comparator A 141 and comparator B
Reference numeral 142 is a power supply voltage comparing means for comparing the power supply voltage value detected by the power supply voltage detector 120 with a predetermined set value and transmitting a signal according to the result to the microcomputer 110. The set value A is set as the voltage value to be compared with the comparator A141, and when the power supply voltage value becomes lower than the set value A, the output signal is inverted and transmitted to the general-purpose port of the microcomputer 110. The set value B is set as the voltage value to be compared in the comparator B142, and when the power supply voltage value becomes lower than the set value B, the output signal is inverted and transmitted to the interrupt port of the microcomputer 110. Here, the relationship between the set values A and B is determined so that the output of the comparator A141 first changes when the power supply voltage drops. Specifically, the set value is determined so that the set value A> the set value B.

The reset circuit 150 plays a role of completely stopping the operation of the microcomputer 110 when the power supply voltage value decreases to a voltage at which the microcomputer 110 cannot operate.
It is a C chip. The reset circuit 150 inputs a signal to the reset terminal of the microcomputer 110 when the power supply voltage value reaches the lower limit voltage (set value C) determined by the specifications of the microcomputer 110 to be used, and the microcomputer 110 and other actuators. Regardless of the operation of
Immediately stop the operation of. The above-mentioned comparator A
141 and the set values A and B in the comparator B142
Is set to be larger than the set value C in the reset circuit 150. Therefore, the relationship among the set values is set value A> set value B> set value C.

The AF drive motor drive control circuit 161 includes:
A drive control circuit that drives the AF motor 171 and performs control based on an instruction from the microcomputer 110. The camera shake correction motor drive control circuit 162 is a drive control circuit that drives the correction motor 172, and performs control based on an instruction from the microcomputer 110.

The AF motor 171 is a motor that serves as a drive source for a lens and the like when performing autofocus. In the present embodiment, an ultrasonic wave that is a vibration actuator that excites a vibration wave on a vibrator to generate a traveling wave on the surface of the vibrator and moves a moving element that is in pressure contact with the vibrator to generate a driving force. You are using a motor. A focus drive section is formed by the AF drive motor drive control circuit 161 and the AF motor 171.

The correction motor 172 is a voice coil motor that drives a shake correction lens (not shown) when performing a shake correction operation. Drive control circuit for camera shake correction motor 1
A blur correction driving unit is formed by 62 and the correction motor 172. The drive control circuit 16 for the camera shake correction motor
Two sets of the correction motor 172 and the correction motor 172 are provided corresponding to two directions orthogonal to the optical axis and orthogonal to each other, but here, for simplification, only one direction is shown.

A battery housing (not shown) is provided in the camera body so that the interchangeable lens 1 can generate electric power within a predetermined voltage range.
00 as a power input Vin. Further, the camera body monitors the voltage obtained from the battery storage section by a battery check section (not shown).

Next, in the camera system of this embodiment, an operation (a low voltage handling process) when the power supply voltage value drops will be described. The power supply voltage value detected by the power supply voltage detector 120 is input to the comparator A 141 and the comparator B 142 and compared with the set value A and the set value B. Further, the reset circuit 150 directly monitors the power supply voltage value and compares it with the set value C. Figure 2
FIG. 6 is a diagram illustrating a case where the power input Vin decreases with time. If the power supply voltage is high enough, DC
AF motor 17 output from the / DC converter 130
1 and the drive voltage for driving the correction motor 172 ensure a predetermined voltage value (range 1).

When the power supply voltage Vin decreases to the set value A, the output signal of the comparator A141 is first inverted. The microcomputer 110 detects the output signal of the comparator A141 by the power supply monitoring sequence that is monitored at regular intervals. After detecting the output signal of the comparator A141, the microcomputer 110 reduces the motor operation time control duty of the AF drive motor drive control circuit 161 so that the power consumption of the AF motor 171 is reduced, and the microcomputer 110
Secures the voltage value necessary for driving. This operation of lowering the drive voltage is the first low voltage handling process (range 2).

When the power supply voltage Vin decreases and reaches the set value B, the output of the comparator B142 is also inverted, and an interrupt command is input to the interrupt port of the microcomputer 110 to interrupt the processing during operation and drive the motor. A signal for stopping the operation is forcibly input to the AF drive motor drive control circuit 161 and the camera shake correction motor drive control circuit 162 to stop the operation of the AF motor 171 and the correction motor 172 (range 3). Stopping the operations of the AF motor 171 and the correction motor 172 is the second low-voltage handling process, which has a higher priority than the first low-voltage handling process. That is, the set voltage B is lower than the set voltage A, and the microcomputer 110
Since the input to is an interrupt port, when the power supply voltage Vin becomes lower than the set value B, this process is performed with priority.

In this state, the AF motor 171 and the correction motor 172 cannot be driven, but since the microcomputer 110 is operating normally, information such as the aperture value is exchanged with the camera body, Interlocking of the diaphragm can be performed. So if you focus manually,
You can take a picture. Since the microcomputer 110 performs the low voltage handling process described above in accordance with the inputs from the comparator A 141 and the comparator B 142, the microcomputer 1
10 will function as a low voltage handling unit.

When the power supply voltage Vin further decreases, the battery check function of the camera body notifies the user of the low battery, and the power supply to the lens side is stopped, or the reset circuit 150 operates to reset the microcomputer. Such (range 4).

According to this embodiment, the comparator A14
1 and the comparator B142 perform two low-voltage handling processes with priorities set according to the power supply voltage value, so that more detailed handling can be performed, and the voltage can be set as much as possible while keeping the image capturing state. When the value drops, it is possible to take reliable measures without fail.

(Second Embodiment) FIG. 3 is a block diagram showing the outline of an interchangeable lens 200 in the second embodiment, similar to FIG. Interchangeable lens 200 in the second embodiment
Is a form in which, instead of the comparator A141 in the interchangeable lens 100 in the first embodiment, finer control is performed in the microcomputer 210. Therefore, with respect to the portion having the same function as that of the first embodiment, the overlapping description will be appropriately omitted.

In this embodiment, an A / D (not shown) built in the microcomputer 210 is used to compare the power supply voltage with the set value.
It uses a converter and is used as the first comparison means.
By using the A / D converter in the microcomputer 210, the control method of the actuator can be changed more finely in order to protect the power supply according to the degree of decrease in the power supply voltage, and the power consumption can be reduced. Processing can be performed in detail according to the situation. On the other hand, the comparator B242 is a second comparing unit that is formed of an analog circuit and can compare voltage values faster than the microcomputer 110. The comparator B242 is
Since the processing is fast, even if the voltage value suddenly drops, it can be dealt with by performing interrupt processing to the microcomputer 210, and the reset circuit 250 can be used.
Can be prevented from operating and becoming unable to shoot.

FIG. 4 assumes an AF drive system in which an ultrasonic motor is used as the AF motor 271 and the ultrasonic motor is controlled by the drive frequency. In that case, the change in the actuator control method due to the decrease in the power supply voltage is assumed. Is shown.

If the power supply voltage is sufficiently high, DC / D
The drive voltage output from the C converter 130 and driving the AF motor 171 and the correction motor 172 secures a predetermined voltage value (range 1).

The power supply voltage Vin decreases and the set voltage DA
When it becomes 1, the microcomputer 210 detects this by the power supply monitoring sequence which is monitored at regular intervals. When it detects that the set voltage DA1 has been reached, the microcomputer 210
Controls the AF drive motor drive control circuit 261 so that the power consumption of the AF motor 271 does not drop sharply.
The sweep speed to the low frequency side of the drive frequency of the AF motor 271 is reduced (range 2).

When the power supply voltage Vin reaches the set voltage DA2, the microcomputer 210 detects this by the power supply monitoring sequence which is monitored at regular intervals. Set voltage DA2
When the microcomputer 210 detects that the power consumption of the AF motor 271 is further reduced,
The F drive motor drive control circuit 261 is prohibited from sweeping the drive frequency of the AF motor 271 to the low frequency side (range 3).

When the power supply voltage Vin reaches the set voltage DA3, the microcomputer 210 detects this by the power supply monitoring sequence which is monitored at regular intervals. Set voltage DA3
Upon detecting that the AF motor 271 is detected, the microcomputer 210 instructs the AF drive motor drive control circuit 261 to reduce the power consumption of the AF motor 271.
Drive frequency is forcedly shifted to the high frequency side (range 4).

When the power supply voltage Vin reaches the set voltage DA4, the microcomputer 210 detects this by the power supply monitoring sequence which is monitored at regular intervals. Set voltage DA4
When the microcomputer 210 detects that the camera shake has occurred, the microcomputer 210 causes the camera shake correction motor drive control circuit 262 to stop driving the camera shake correction motor 272 in order to continue shooting. The correction operation is stopped (range 5).

When the power supply voltage Vin decreases and reaches the set value B, the output of the comparator B242 is inverted, an interrupt command is input to the interrupt port of the microcomputer 210, the processing during operation is interrupted, and the motor is driven. A signal for stopping is forcibly input to the AF drive motor drive control circuit 261 and the camera shake correction motor drive control circuit 262 to perform AF
Motor 271 and correction motor 272 (when operating)
The operation of is stopped (range 6). Since the set voltage B is lower than the set voltages DA1 to DA4, and the input to the microcomputer 210 is an interrupt port, when the power supply voltage Vin becomes lower than the set value B, this process ( The processing of range 6) is performed with priority.

In this state (range 6), the AF motor 271 and the correction motor 272 cannot be driven, but since the microcomputer 210 is operating normally, information such as the aperture value is sent to the camera body. It can be exchanged and linked with the diaphragm. Therefore, shooting can be performed by manually focusing.

When the power supply voltage Vin further decreases, the user is notified of the power supply voltage decrease by the battery check function of the camera body side, the power supply to the lens side is stopped, or the reset circuit 250 operates to reset to the microcomputer. Takes (range 7).

In a high-performance interchangeable lens having an AF drive system and a camera shake correction system, the current consumption of the drive circuit in these systems accounts for a large proportion of the current consumption of the entire lens. However, in consideration of the actual operation, AF is necessary as long as the subject is tracked, whereas the camera shake correction system needs to be driven only at the time of release. This means that the power supply current is consumed longer.

Further, in the camera shake correction system, it is difficult to take the detailed countermeasures against the consumed current as shown in FIG. 4, and it is difficult to take measures to suppress the power consumption even if the performance is lowered. Therefore, as in the present embodiment, a method of observing the current consumption of the power supply mainly by the microcomputer 210, finely adjusting the AF drive system, and quickly stopping the camera shake correction function when the power supply voltage drops significantly is a method. , Effective as a power protection operation.

According to the present embodiment, the current consumption of the power source is observed by the microcomputer 210 and the AF drive system is finely adjusted, so that a more stable operation can be performed.

(Modifications) The present invention is not limited to the above-described embodiments, and various modifications and changes can be made, which are also within the scope of the present invention. For example, in each embodiment, an example in which the present invention is applied to an interchangeable lens of a camera system in which the lens can be exchanged is shown, but the present invention is not limited to this.
For example, it may be an imaging device with a fixed lens.

[0051]

As described in detail above, according to the present invention, the following effects can be obtained. (1) In addition to the reset circuit, a voltage detecting means for detecting a power supply voltage, at least two comparing means for comparing the output of the voltage detecting means with a predetermined value, and a comparison result of the comparing means. Since the low-voltage handling processing unit that selectively performs a plurality of low-voltage handling processes provided with predetermined priorities is provided, it is possible to flexibly deal with a voltage drop.

(2) The comparing means includes a first comparing means for performing comparison with a predetermined value in the control section via an A / D converter for converting the analog signal of the voltage detecting means into a digital signal, and a comparator outside the control section. Since it has a second comparison means formed by an analog circuit capable of performing a comparison with a predetermined value at a higher speed than the first comparison means, it is possible to make a detailed correspondence according to the degree of voltage drop. It is possible, and even if the voltage drops sharply, appropriate processing can be performed and stable operation can be performed.

(3) The low voltage handling process has a power consumption reduction process performed according to the comparison result of the first comparison means and an interruption process performed according to the comparison result of the second comparison means. It is possible to operate while suppressing power consumption according to the degree of decrease in the image, and to continue shooting as much as possible. Further, even if the voltage suddenly drops, the interrupt processing is performed, so that appropriate processing can be surely performed.

(4) The power consumption reduction process is a process for reducing the power consumption of the focus drive unit by changing the drive condition of the focus drive unit, and the interrupt process is the focus drive unit and / or Alternatively, since it is the process of stopping the operation of the shake correction drive unit, it is possible to widen the voltage range in which shooting can be continued.

(5) Since the power consumption reduction process is composed of a plurality of processes including priorities including a process of lowering the operation speed of the focusing drive unit according to the comparison result of the first comparison means, the voltage is reduced. Even if it decreases, the range in which it can be used can be expanded as usual except that the operation is slow.

[Brief description of drawings]

FIG. 1 is an interchangeable lens 1 used in a photographing apparatus according to the present invention.
It is a block diagram which shows the outline of 00.

FIG. 2 is a diagram illustrating a case where a power input Vin decreases with time.

FIG. 3 is a block diagram showing an outline of an interchangeable lens 200 according to a second embodiment, similar to FIG.

FIG. 4 shows a change in an actuator control method with a decrease in power supply voltage in the case where an AF drive system in which an ultrasonic motor is used as an AF motor 271 and the ultrasonic motor is controlled by a drive frequency is assumed. It is a thing.

[Explanation of symbols]

100,200 lens barrel 110, 210 microcomputer 120,220 Power supply voltage detector 130,230 DC / DC converter 141 Comparator A 142,242 Comparator B 150,250 reset circuit 161,261 AF drive motor drive control circuit Drive control circuit for 162, 262 image stabilization motor 171,271 AF motor 172, 272 correction motor

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G02B 7/08 G03B 7/00 B G03B 7/00 17/02 17/02 H04N 5/225 D H04N 5 / 225 G02B 7/04 Z

Claims (10)

[Claims] 1. A photographing optical system, a blurring correction optical system that forms at least a part of the photographing optical system, and corrects a blur on an image pickup surface of a photographing device, and an in-focus drive of an image obtained by the photographing optical system. A focusing drive section for performing a blur correction driving section for driving the blur correction optical system, a control section for controlling the focus driving section and the blur correction driving section, and a power source supplied to the control section. A reset circuit that outputs a reset signal to the control unit when the voltage becomes a predetermined value or less, a voltage detection unit that detects the power supply voltage separately from the reset circuit, and an output of the voltage detection unit are predetermined. At least two comparing means for making a comparison with a predetermined value, and a low-voltage handling processing section for selectively performing a plurality of low-voltage handling processing provided with a predetermined priority according to the comparison result of the comparing means. When, Interchangeable lens equipped with. 2. The interchangeable lens according to claim 1, wherein the comparison unit compares the analog signal of the voltage detection unit with the predetermined value in the control unit via an A / D converter that converts the analog signal into a digital signal. And a second comparing means which is outside the control unit and which is formed by an analog circuit which is outside the control section and can perform comparison with the predetermined value faster than the first comparing means. And an interchangeable lens characterized by having. 3. The interchangeable lens according to claim 2, wherein the low voltage handling process is a power consumption reduction process performed according to a comparison result of the first comparing unit, and a comparison result of the second comparing unit. An interchangeable lens characterized by having interrupt processing performed according to the following. 4. The interchangeable lens according to claim 3, wherein the power consumption reduction process is a process of reducing power consumption of the focusing drive unit by changing a driving condition of the focusing drive unit. Yes, the interrupt process is a process of stopping the operation of the focusing drive unit and / or the shake correction drive unit. 5. The interchangeable lens according to claim 3 or 4, wherein the power consumption reduction process is a process of reducing an operation speed of the focusing drive unit according to a comparison result of the first comparison unit. The interchangeable lens is characterized by comprising a plurality of processes including priority, including. 6. A photographing optical system, a blurring correction optical system which forms at least a part of the photographing optical system, and corrects a blur on an image pickup surface of a photographing device, and an in-focus drive of an image obtained by the photographing optical system. A focusing drive section for performing a blur correction driving section for driving the blur correction optical system, a control section for controlling the focus driving section and the blur correction driving section, and a power source supplied to the control section. A reset circuit that outputs a reset signal to the control unit when the voltage becomes a predetermined value or less, a voltage detection unit that detects the power supply voltage separately from the reset circuit, and an output of the voltage detection unit are predetermined. At least two comparing means for making a comparison with a predetermined value, and a low-voltage handling processing section for selectively performing a plurality of low-voltage handling processing provided with a predetermined priority according to the comparison result of the comparing means. When, An imaging device that includes a power supply unit that supplies electric power. 7. The photographing device according to claim 6, wherein the comparison unit compares the analog signal of the voltage detection unit with the predetermined value in the control unit via an A / D converter that converts the analog signal into a digital signal. And a second comparing means which is outside the control unit and which is formed by an analog circuit which is outside the control section and can perform comparison with the predetermined value faster than the first comparing means. An imaging device, comprising: 8. The image pickup apparatus according to claim 7, wherein the low voltage handling process is a power consumption reduction process performed according to a comparison result of the first comparison unit, and a comparison result of the second comparison unit. And an interrupt process performed according to the following. 9. The image capturing apparatus according to claim 8, wherein the power consumption reduction process is a process of reducing power consumption of the focusing drive unit by changing a driving condition of the focusing drive unit. Yes, the interrupt process is a process of stopping the operation of the focusing drive unit and / or the shake correction drive unit. 10. The imaging device according to claim 8, wherein the power consumption reduction process is a process of reducing an operation speed of the focusing drive unit according to a comparison result of the first comparison unit. An image pickup apparatus, comprising: a plurality of processes having priorities including.