Electronic device, imaging apparatus, and method of switching power source
An electronic device, an imaging apparatus, and a method of switching a power source that can smoothly switch a power source while preventing instantaneous interruption in a case where power source supply lines are shut off from each other between a device body and an external device on which a plurality of power sources can be mounted. A power source-switching preparation unit performs first processing for shifting an electronic device to an electric power-saving state and second processing for shifting the electronic device to a state where electric power can be supplied from a plurality of power sources, as switching preparation, and a power source-switching control unit switches a main power source according to a set order of priority in a state where the switching preparation is performed.
1. An electronic device comprising:
a device body on which a battery power source and an adapter power source are mountable; and
an external device which is to be attached to or detached from the device body and on which a battery power source and an adapter power source are mountable,
wherein electric power supply lines of the battery power source and the adapter power source of the device body and electric power supply lines of the battery power source and the adapter power source of the external device are shut off from each other,
wherein the device body includes:
an order-of-priority setting unit that sets an order of priority of supply of electric power to the electronic device between the battery power source and the adapter power source of the device body and the battery power source and the adapter power source of the external device;
a power source-switching preparation unit that performs switching preparation of a main power source which is a power source formed of either the battery power source and the adapter power source of the device body, or the battery power source and the adapter power source of the external device and supplys electric power to the electronic device, and
a power source-switching control unit that switches the main power source among the battery power source and the adapter power source of the device body and the battery power source and the adapter power source of the external device on the basis of the set order of priority according to a state of the main power source,
wherein the power source-switching preparation unit performs first processing for shifting the electronic device to an electric power-saving state and second processing for shifting the electronic device to a state where electric power is capable of being supplied from a plurality of power sources among the battery power source and the adapter power source of the device body and the battery power source and the adapter power source of the external device, as the switching preparation, and
wherein the power source-switching control unit switches the main power source according to the set order of priority in a state where the switching preparation is performed.
2. The electronic device according to claim 1 ,
wherein the power source-switching preparation unit shifts the electronic device to a first switchable state where electric power is capable of being supplied from both the battery power source or the adapter power source of the device body, and the battery power source or the adapter power source of the external device, and
the power source-switching control unit switches the main power source in a state where the electronic device is shifted to the first switchable state.
3. The electronic device according to claim 2 ,
wherein the power source-switching preparation unit virtually shifts the electronic device to a state where electric power is also capable of being supplied from the adapter power source of any one of the device body or the external device as the first switchable state in a case where the power source-switching preparation unit detects that electric power is capable of being supplied from the adapter power source of any one of the device body or the external device, and
the power source-switching control unit switches the main power source in the first switchable state to which the electronic device is virtually shifted.
4. The electronic device according to claim 1 ,
wherein the power source-switching preparation unit shifts the electronic device to any one of a second switchable state where electric power is capable of being supplied from both the battery power source and the adapter power source of the device body or a third switchable state where electric power is capable of being supplied from both the battery power source and the adapter power source of the external device, and
the power source-switching control unit switches the main power source in a state where the electronic device is shifted to the second switchable state or the third switchable state.
5. The electronic device according to claim 1 ,
wherein the order-of-priority setting unit sets the order of priority of one of the device body and the external device, to which electric power is capable of being supplied from both the battery power source and the adapter power source, to an order of priority higher than the order of priority of one of the device body and the external device to which electric power is not capable of being supplied from both the battery power source and the adapter power source.
6. The electronic device according to claim 2 ,
wherein the order-of-priority setting unit sets the order of priority of one of the device body and the external device, to which electric power is capable of being supplied from both the battery power source and the adapter power source, to an order of priority higher than the order of priority of one of the device body and the external device to which electric power is not capable of being supplied from both the battery power source and the adapter power source.
7. The electronic device according to claim 3 ,
wherein the order-of-priority setting unit sets the order of priority of one of the device body and the external device, to which electric power is capable of being supplied from both the battery power source and the adapter power source, to an order of priority higher than the order of priority of one of the device body and the external device to which electric power is not capable of being supplied from both the battery power source and the adapter power source.
8. The electronic device according to claim 1 ,
wherein the order-of-priority setting unit sets the order of priority of the adapter power source of the device body to an order of priority higher than the order of priority of the battery power source of the device body, and sets the order of priority of the adapter power source of the external device to an order of priority higher than the order of priority of the battery power source of the external device.
9. The electronic device according to claim 1 ,
wherein the power source-switching preparation unit performs the switching preparation by using electric charges that are accumulated in a capacitor provided in the device body or a capacitor provided in the external device.
10. The electronic device according to claim 1 ,
wherein the power source-switching control unit switches the main power source by using a backup power source provided in the device body or a backup power source provided in the external device.
11. The electronic device according to claim 1 ,
wherein the power source-switching control unit switches the main power source by using electric charges that are accumulated in a capacitor provided in the device body or a capacitor provided in the external device.
12. The electronic device according to claim 1 , further comprising:
a storage unit that stores software controlling the switching preparation and the switching,
wherein the power source-switching preparation unit performs the switching preparation by using the stored software, and
the power source-switching control unit performs the switching by using the stored software.
13. The electronic device according to claim 1 ,
wherein the device body comprises a power source detection unit detecting from which of the battery power source and the adapter power source of the device body and the battery power source and the adapter power source of the external device electric power is capable of being supplied, and
the order-of-priority setting unit sets the order of priority on the basis of a result of the detection.
14. The electronic device according to claim 1 ,
wherein the state of the main power source is a voltage level of the main power source.
15. An imaging apparatus comprising:
the electronic device according to claim 1 ;
an imaging optical system that is provided in the device body; and
an imaging element that is provided in the device body and outputs a signal representing an optical image of a subject formed by the imaging optical system.
16. The imaging apparatus according to claim 15 ,
wherein the power source-switching control unit does not perform the switching in a case where the imaging apparatus is not in a state where the main power source is switchable.
17. The imaging apparatus according to claim 16 ,
wherein the power source-switching preparation unit determines that the imaging apparatus is not in the state where the main power source is switchable, during a period until image data representing the subject is generated and recorded after the imaging element outputs the signal.
18. The imaging apparatus according to claim 15 ,
wherein the power source-switching preparation unit shifts the imaging optical system and the imaging element to a sleep state as the electric power-saving state.
19. The imaging apparatus according to any one of claim 15 ,
wherein the external device is an external grip for the device body.
20. A method of switching a power source of an electronic device including a device body on which a battery power source and an adapter power source are mountable, and an external device which is to be attached or detached to or from the device body and on which a battery power source and an adapter power source are mountable, wherein electric power supply lines of the battery power source and the adapter power source of the device body and electric power supply lines of the battery power source and the adapter power source of the external device being shut off from each other, the method comprising:
an order-of-priority setting step of setting an order of priority of supply of electric power to the electronic device between the battery power source and the adapter power source of the device body and the battery power source and the adapter power source of the external device;
a power source switching-preparation step of performing switching preparation of a main power source which is a power source formed of either the battery power source and the adapter power source of the device body, or the battery power source and the adapter power source of the external device and supplys electric power to the electronic device; and
a power source switching-control step of switching the main power source among the battery power source and the adapter power source of the device body and the battery power source and the adapter power source of the external device on the basis of the set order of priority according to a state of the main power source,
wherein the power source switching-preparation step performs first processing for shifting the electronic device to an electric power-saving state and second processing for shifting the electronic device to a state where electric power is capable of being supplied from a plurality of power sources among the battery power source and the adapter power source of the device body and the battery power source and the adapter power source of the external device as the switching preparation, and
wherein the power source switching-control step switches the main power source according to the set order of priority in a state where the switching preparation is performed.