1. A switching circuit comprising:
a switching section including at least one first terminal, a plurality of second terminals, and a switching element configured to connect the first terminal to one of the second terminals;
a driver configured to drive the switching element in accordance with an external terminal switching control signal;
a DC-to-DC converter including
an oscillator configured to oscillate at a lower oscillation frequency in a second state than an oscillation frequency in a first state,
a charge pump configured to operate in response to an output of the oscillator, and
an another charge pump configured to operate in response to the output of the oscillator,
the DC-to-DC converter configured to output a positive voltage and a negative voltage to the driver, and an absolute value of an output current for each of the positive voltage and the negative voltage in the first state being larger than an absolute value in the second state; and
a power controller configured to control the DC-to-DC converter to operate with the first state during a first time period determined based on the change of the external terminal switching control signal, and to operate with the second state during a second time period other than the first time period.
2. The switching circuit according to claim 1, further comprising:
a clamp circuit configured to stabilize an output voltage from the DC-to-DC converter; and
a clamp control circuit configured to turn off the clamp circuit during the first time period and turn on the clamp circuit during the second time period.
3. A switching circuit comprising:
a switching section including at least one first terminal, a plurality of second terminals, and a switching element configured to connect the first terminal to one of the second terminals;
a driver configured to drive the switching element in accordance with an external terminal switching control signal;
a DC-to-DC converter configured to output a positive voltage and a negative voltage to the driver, and an absolute value of an output current for each of the positive voltage and the negative voltage in a first state being larger than an absolute value of an output current for each of the positive voltage and the negative voltage in a second state; and
a power controller configured to control the DC-to-DC converter to operate with the first state during a first time period determined based on the change of the external terminal switching control signal, and to operate with the second state during a second time period other than the first time period.
4. The switching circuit according to claim 3, wherein
the DC-to-DC converter includes
an oscillator configured to output a higher oscillation frequency in the first state than an oscillation frequency in the second state, and
a plurality of charge pumps configured to operate in response to an output of the oscillator and outputting the positive voltage and the negative voltage.
5. The switching circuit according to claim 3, further comprising:
a clamp circuit configured to stabilize an output voltage from the DC-to-DC converter; and
a clamp control circuit configured to turn off the clamp circuit during the first time period and turn on the clamp circuit during the second time period.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An imaging apparatus comprising:
a detector including a plurality of pixels arranged in an array, wherein each of said pixels includes a conversion element for converting radiation or light into an electric charge, and said detector performs an imaging operation for outputting an image data according to an irradiation with the radiation or the light; and
a controlling unit for controlling an operation of said detector including the imaging operation, wherein
the imaging operation includes a first imaging operation for outputting an image data according to the irradiation with the radiation or the light in a first irradiation field corresponding to a part of said plurality of pixels, and a second imaging operation for outputting an image data according to the irradiation with the radiation or the light in a second irradiation field of an area larger than that of the first irradiation field, and
said controlling unit controls the operation of said detector such that, responsive to a changing from the irradiation in the first irradiation field to the irradiation in the second irradiation field, said detector performs an initializing operation for initializing said conversion elements during a period between the first and second imaging operations.
2. The imaging apparatus according to claim 1, wherein said control unit controls the operation of said detector such that said detector performs the initializing operations plural times during the period between the first and second imaging operations.
3. The imaging apparatus according to claim 1, wherein
the second imaging operation includes an accumulating operation for converting the radiation or the light irradiated onto said conversion elements into the electric charge, and an image output operation for outputting the image data based on the electric charge, and
said controlling unit controls said detector to perform the initializing operation during the same length of a period as a period of the image output operation, such that said detector performs the initializing operation corresponding to the second imaging operation during the period between the first and second imaging operations.
4. The imaging apparatus according to claim 1, wherein the second imaging operation includes an accumulating operation for converting the radiation or the light irradiated onto said conversion elements into the electric charge, an image output operation for outputting the image data based on the electric charge, and the initializing operation performed before the accumulating operation.
5. The imaging apparatus according to claim 1, wherein
each of said pixels further includes a switching element for outputting an electric signal according to the electric charge,
said detector includes a detecting unit including said plurality of pixels arranged in said array, a driving circuit for controlling a conducting state of said switching elements to drive said detecting unit, and a read out circuit for outputting, as the image data, the electric signal from said detector unit through a signal wiring connected to said switching elements,
said read out circuit includes a reset switch for resetting said signal wiring, and
said controlling unit controls said driving circuit and said reset switch during the period between the first and second imaging operations such that said detector performs the initializing operation.
6. The imaging apparatus according to claim 1, wherein
each of said pixels further includes a first switching element for outputting an electric signal according to the electric charge, and an additional switching element,
said detector includes a detecting unit including said plurality of pixels arranged in said array, a driving circuit for controlling a conducting state of said first switching elements to drive said detecting unit, a read out circuit for outputting, as the image data, the electric signal from said detector unit through a signal wiring connected to said first switching elements, an additional driving circuit for controlling a conducting state of said additional switching elements, and
said controlling unit controls said driving circuit and said additional driving circuit during the period between the first and second imaging operations such that said driving circuit controls a conducting state of said first switching elements and said additional driving circuit controls a conducting state of said additional switching elements, to set the detector to perform the initializing operation for a period of the same length as that of the outputting operation in the second imaging operation.
7. The imaging apparatus according to claim 6, wherein
said conversion elements are MIS type conversion elements,
said imaging apparatus further comprises a power source including a reference power source for supplying a reference voltage through said first switching elements to one electrode of said conversion elements, a refreshment power source for supplying a refreshment voltage through said additional switching elements to the one electrode of said conversion elements, and a bias power source for supplying a bias voltage to the other of the electrodes of said conversion elements,
said detector performs a refreshment operation for refreshing said conversion elements by setting said additional switching elements in a conducting state, by supplying the bias voltage to the other of the electrodes of said conversion elements, and by supplying the refreshment voltage through said additional switching elements to the one electrode of said conversion elements, and
said controlling unit controls said detector such that said detector performs, during the period between the first and second imaging operations, the refreshment operation, and the initializing operation after the refreshment operation.
8. An imaging system comprising:
the said imaging apparatus according to claim 1;
a radiation generator apparatus for irradiating said imaging apparatus with the radiation; and
a controlling apparatus for controlling said imaging apparatus and said radiation generator apparatus, wherein
said radiation generator apparatus includes a mechanism having a function of switching between the first and second irradiation fields according to a control signal received from said controlling apparatus.
9. A controlling method of an imaging apparatus that comprises a detector including a plurality of pixels arranged in an array, wherein each pixel includes a conversion element for converting radiation or light into an electric charge, and the detector performs an imaging operation for outputting image data according to an irradiation with the radiation or the light, the method controlling an operation of the detector including the imaging operation, wherein the method comprises:
a first imaging operation of outputting image data according to the irradiation with the radiation or the light in a first irradiation field corresponding to a part of the plurality of pixels of the detector;
an initializing operation, following said first imaging operation, of initializing the conversion element, responsive to an instruction for changing the irradiation in the first irradiation field to the irradiation in a second irradiation field of an area larger than that of the first irradiation field; and
a second imaging operation, following said initializing operation, of outputting an image data according to the irradiation with the radiation or the light in the second irradiation field of the detector.
10. A non-transitory computer-readable storage medium storing, in executable form, a computer program for causing a computer to execute a controlling of an imaging apparatus that comprises a detector including a plurality of pixels arranged in an array, wherein each pixel includes a conversion element for converting radiation or light into an electric charge, and the detector performs an imaging operation for outputting image data according to an irradiation with the radiation or the light, such that the detector performs an operation including an imaging operation, wherein said computer program causes the detector to perform:
a first imaging operation of outputting an image data according to the irradiation with the radiation or the light in a first irradiation field corresponding to a part of the plurality of pixels of the detector;
an initializing operation, following said first imaging operation, of initializing the conversion element, responsive to an instruction for changing the irradiation in the first irradiation field to the irradiation in a second irradiation field of an area larger than that of the first irradiation field; and
a second imaging operation, following said initializing operation, of outputting image data according to the irradiation with the radiation or the light in the second irradiation field of the detector.