JP2011242707A - Radiation image imaging device, radiation image imaging system and charging method of radiation image imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable miniaturization of a device and charging of plural power storages connected in series without causing overvoltage.SOLUTION: A radiation image imaging device comprises: a power receiving connection section 26 for receiving the power supplied from an external power supply; a single charging circuit 61 for charging each of power storages 28 A and 28B based on the power supplied by the power receiving connection section; voltage detection means 63 for detecting the voltage of the respective power storages; connection switching means 62 capable of switching the connection between the respective power storages and the charging circuit; and a charge control section 64 that controls the connection switching means according to the detected voltage of the respective power storages. When a first target voltage V1 of the voltage of every power storages are not satisfied, the charge control section controls the connection switching means to connect all the power storages connected in series to be charged simultaneously, and the power storage the voltage of which has reached the first target is excluded from the charging object.

Description

  The present invention relates to a radiographic image capturing apparatus, a radiographic image capturing system, and a charging method for the radiographic image capturing apparatus.

In recent years, radiographic imaging devices called flat panel detectors (FPDs), which are means for acquiring medical radiographic images, have built-in power storage units consisting of capacitors and secondary batteries, and are cable-less. A cassette-type radiation image capturing apparatus configured to be portable is developed (see, for example, Patent Document 1).
When the radiographic imaging apparatus is configured to be portable, it is possible to perform imaging with a high degree of freedom including portable imaging on a patient's bedside or the like.

By the way, the capacitor or secondary battery (hereinafter referred to as a capacitor or the like) as the power storage unit has an output voltage set within a certain range according to the specification, and satisfies the voltage required for each component in the radiographic apparatus. There was no case.
Therefore, in such a case, it is necessary to provide a booster circuit in the radiographic imaging apparatus or to use a plurality of power storage units connected in series.

JP 2009-237074 A

However, when the power storage unit is provided with a booster circuit, there is a problem that the power efficiency is likely to be lowered and the frequency of charging is increased.
In addition, when the power storage unit is provided in the radiographic imaging device, a charge control circuit that monitors the voltage of the power storage unit and performs charging until the target voltage is reached is necessary. For a plurality of power storage units connected in series, When charging is performed with a single charge control circuit, charging is performed simultaneously on a plurality of directly connected power storage units, so that there is a variation in voltage due to individual errors in the capacitance of each power storage unit. Even if it occurred, this could not be corrected and there was a possibility of overvoltage for some of the power storage units.
Therefore, as a countermeasure, it is conceivable to individually provide a charge control circuit for each power storage unit and monitor the voltage individually. There has been a problem that the size of the image photographing apparatus is increased.
In addition, it is conceivable to employ a configuration in which a plurality of charge control circuits corresponding to each power storage unit are provided outside the radiation image capturing apparatus and connected via a connector at the time of charging. In order to connect to each power storage unit incorporated in the battery, a large number of terminals of the connector are required, which causes a problem in that the radiographic imaging apparatus is increased in size with the increase in size of the connector.

  Therefore, an object of the present invention is to make it possible to charge a plurality of power storage units connected in series without causing overvoltage while reducing the size of the device.

In order to solve the above-described problem, a radiographic imaging apparatus according to the present invention includes:
A cassette-type radiation imaging apparatus capable of being driven by supplying power from each power storage unit, which includes a plurality of power storage units connected in series to supply power to each functional unit.
A power receiving side connection for receiving power supplied from an external power source;
A single charging circuit for charging each power storage unit based on the power supplied by the power receiving side connection unit;
Voltage detecting means for detecting a voltage of each of the power storage units;
Connection switching means capable of switching the connection state between each of the power storage units and the charging circuit so that charging is performed on each of the power storage units or two or more of the power storage units connected in series;
A charge control unit that controls the connection switching unit according to the voltage detected by the power storage unit by the voltage detection unit;
The charging control unit is connected to the connection switching unit so that all the power storage units connected in series are charged simultaneously when the voltages of all the power storage units do not satisfy the first target voltage. And controlling to switch the connection state so as to exclude the power storage unit that has reached the first target voltage from the charging target.

Moreover, the radiographic imaging system which is another aspect of this invention is the following.
A cassette-type radiographic imaging apparatus including a plurality of power storage units connected in series for supplying power to each functional unit in a housing and a power receiving side connection unit for receiving power,
A power supply side connection unit that is detachably connected to the power reception side connection unit and supplies power to the radiation imaging apparatus,
A radiographic imaging system that charges each power storage unit when the power receiving side connection unit and the power feeding side connection unit are connected to the radiographic imaging device,
Voltage detecting means for detecting a voltage of each of the power storage units;
A single charging circuit for charging each power storage unit based on the power supplied by the power receiving side connection unit;
Connection switching means capable of switching the connection state between each of the power storage units and the charging circuit so that charging is performed on each of the power storage units or two or more of the power storage units connected in series;
A charge control unit that controls the connection switching unit according to the voltage detected by the power storage unit by the voltage detection unit;
At least the charging control unit is provided outside the radiographic imaging device, and
The charging control unit sets a connection state in which all the power storage units connected in series are simultaneously charged when the voltage of all the power storage units is less than the first target voltage with respect to the connection switching unit. The control unit switches the connection state so as to exclude the power storage unit that has reached the first target voltage from a charge target.

Furthermore, the charging method of the power storage unit of the radiographic imaging device according to another aspect of the present invention,
In the charging method of the power storage unit of the cassette type radiographic imaging apparatus including a plurality of power storage units connected in series for supplying power to each functional unit inside the casing and a power receiving side connection unit for receiving power There,
Detecting the voltage of each power storage unit,
A single unit that charges all the power storage units connected in series based on the power supplied from an external power supply source when the voltages of all the power storage units do not satisfy the first target voltage. Connect to the charging circuit and charge at the same time,
The connection state with the charging circuit is switched so that the power storage unit that has reached the first target voltage is excluded from a charging target.

The present invention switches the connection with each power storage unit using a single charging circuit, so that all the power storage units connected in series at the beginning of charging are charged simultaneously, and the power storage unit that has reached the first target voltage Are charged until all the electric storage units reach the first target voltage while being excluded from the charging target, it is possible to charge a plurality of electric storage units at a high speed by one charging circuit, and for each electric storage unit Since the charging circuit is not required, the radiographic apparatus can be reduced in size.
In addition, since the voltage of each power storage unit is monitored and the first target voltage is reached, it is excluded from the charging target, so that it is possible to effectively suppress the occurrence of overvoltage for each power storage unit.

It is the schematic which shows the system configuration | structure of the radiographic image detection system which concerns on 1st Embodiment. It is explanatory drawing which shows the principal part structure of the cradle in FIG. It is a perspective view which shows the external appearance of the radiographic imaging apparatus shown in FIG. It is an equivalent circuit diagram which shows the structure of the sensor panel part, reading part, etc. of the radiographic imaging apparatus shown in FIG. It is the principal part block diagram which extracted only the structure for charging a capacitor in a radiographic imaging apparatus. Each connection state of a connection switching part is illustrated in table format. It is a state transition diagram of the connection state at the time of charge by a charge control circuit. It is the diagram which illustrated the voltage change in each connection state. It is a block diagram which shows the system configuration | structure of a radiographic imaging system. 4 is a flowchart of charging control performed by the radiographic image capturing apparatus 2. It is a state transition diagram of the connection state at the time of charge by the charge control circuit in 2nd Embodiment. It is the principal part block diagram which extracted only the structure for charging a capacitor in the radiographic imaging apparatus in 3rd Embodiment. Each connection state of the connection switching part in 3rd Embodiment is illustrated in table format. It is a state transition diagram of the connection state at the time of charge by the charge control circuit in 3rd Embodiment. It is a principal part block diagram which mainly illustrated the structure for charging the capacitor mounted in the radiographic imaging apparatus which is 4th Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Note that embodiments to which the present invention is applicable are not limited to this.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS. However, embodiments to which the present invention can be applied are not limited to those shown in the drawings.

FIG. 1 is a diagram showing a schematic configuration of a radiographic image detection system, FIG. 2 is a diagram showing a main configuration of a cradle provided in the radiographic image detection system, and FIG. 3 is a radiographic image in the present embodiment. It is a perspective view of an imaging device.
As shown in FIG. 1, a radiological image detection system 1 according to the present embodiment includes a radiographic image capturing device 2 that includes two capacitors 28 and 28 as power storage units, and a cradle on which the radiographic image capturing device 2 is placed. 4 and a power supply cable 5 connected to the radiation image capturing apparatus 2.

The cradle 4 is a power supply means 50 for charging a capacitor configured to be able to supply power to the radiographic image capturing apparatus 2 from the outside by mounting the radiographic image capturing apparatus 2.
As shown in FIG. 2, the cradle 4 has an AC / DC constant voltage power supply 41 connected to an outlet 8 connected to an external power supply (not shown) and power supplied from the AC / DC constant voltage power supply 41 to the outside. And an output connector portion 42 as a power feeding side connection portion for outputting.
The AC / DC constant voltage power supply 41 always outputs power at a constant voltage regardless of load fluctuations, and the output connector unit 42 supplies power to the radiographic imaging apparatus 2 at this predetermined voltage. It comes to supply.
In the present embodiment, the cradle 4 has an output connector portion, and a cradle output connector portion 42 that is connected to the device-side connector portion 26 as a power receiving side connection portion when the radiographic imaging device 2 is placed on the cradle 4. A cable output connector portion 43 to which the power supply cable 5 connected to the device-side connector portion 26 is connected is provided.

When the radiographic imaging device 2 is attached to the cradle 4, the cradle output connector unit 42 is electrically connected to the device side connector unit 26 of the radiographic imaging device 2, and the radiographic image is supplied from the AC / DC constant voltage power supply 41. Electric power is supplied directly to the photographing apparatus 2.
Further, when the power feeding cable 5 connected to the cable output connector 43 is connected to the apparatus-side connector 26, power is supplied from the AC / DC constant voltage power supply 41 to the radiation imaging apparatus 2 via the power feeding cable 5. The

  The power supply cable 5 can supply power to the radiographic image capturing apparatus 2 from the outside by connecting to the radiographic image capturing apparatus 2. In the present embodiment, the power supply cable 5 has a connection portion 51 connected at one end to the device-side connector portion 26 of the radiographic imaging device 2, and the other end connected to the cable output connector portion 43 of the cradle 4. Is done. That is, the connection unit 51 functions as a power supply side connection unit, and thereby, power is supplied from the AC / DC constant voltage power supply 41 to the radiographic imaging apparatus 2.

  In the present embodiment, an example is shown in which the power supply cable 5 is connected to an external power supply via the cradle 4. However, the connection method between the power supply cable 5 and the external power supply is not limited to this, and the power supply cable 5 May be configured to be directly connected to an AC / DC constant voltage power source outside the cradle 4 so that power is supplied from the external power source to the radiation image capturing apparatus 2.

In this embodiment, the radiographic image capturing apparatus 2 is a portable cassette type FPD in which a so-called flat panel detector (hereinafter referred to as “FPD”) is configured in a cassette type, and is used for radiographic image capturing. Image data (hereinafter simply referred to as “image data”) is acquired.
In the following, a so-called indirect radiation image capturing apparatus that includes a scintillator or the like and converts the emitted radiation into electromagnetic waves of other wavelengths such as visible light to obtain an electrical signal will be described as the radiation image capturing apparatus 2. However, the present invention can also be applied to a so-called direct type radiographic imaging apparatus that directly detects radiation with a radiation detection element without using a scintillator or the like.

As shown in FIG. 3, the radiographic image capturing apparatus 2 includes a housing 21 that protects the inside. The housing 21 has at least a surface X on which radiation is received (hereinafter referred to as a radiation incident surface X) formed of a material such as a carbon plate or plastic that transmits radiation.
FIG. 3 shows a case where the casing 21 is formed of a front member 21a and a back member 21b. However, the shape and configuration are not particularly limited. It is also possible to form a cylindrical so-called monocoque shape or the like.

  As shown in FIG. 3, in the present embodiment, a power switch 22, an indicator 25, an apparatus-side connector portion 26, and the like are disposed on the side surface portion of the radiographic image capturing apparatus 2.

  The power switch 22 is used to switch on / off the power of the radiographic image capturing apparatus 2, and by operating the power switch 22, each functional unit of the radiographic image capturing apparatus 2 by a capacitor 28 (see FIG. 1) described later. A signal instructing the start and stop of the power supply is output to a main body control unit 30 (see FIG. 1) described later. When the radiographic imaging device 2 is not used for imaging, the power consumption of the capacitor 28 can be suppressed by turning off the power (that is, stopping the power supply to each functional unit by the capacitor 28).

  The indicator 25 is composed of, for example, an LED or the like, and displays the remaining amount of charge of the capacitor 28 and various operation statuses.

In addition, the radiographic image capturing device 2 is provided with a capacitor 28 that supplies power to each functional unit of the radiographic image capturing device 2.
The capacitor 28 can be charged, and for example, a storage element such as a lithium ion capacitor (LIC) or an electric double layer capacitor can be applied.

  Among these, a lithium ion capacitor is particularly preferable because it is excellent in power storage efficiency, can be charged at high speed with a large current (for example, 5 to 10 amperes), and can greatly shorten the charging time. That is, since the charging time is almost inversely proportional to the magnitude of the charging current, the charging time can be shortened by increasing the charging current.

  Further, a lid member 70 that is opened and closed for replacement of the capacitor 28 built in the housing 21 is provided on the side surface portion of the radiographic image capturing apparatus 2. An antenna device 71 is embedded for the image capturing apparatus 2 to transmit and receive information to and from the outside via a wireless access point 113 (see FIG. 9) described later.

The device-side connector portion 26 (shown simply as “connector portion” in FIG. 1) is configured to be electrically connectable to each of the cradle 4 and the power feeding cable 5 and is detachable from each other. Yes.
Further, the device-side connector portion 26 is provided at a position corresponding to the cradle output connector portion 42 when the radiographic imaging device 2 is placed on the cradle 4.

  A power supply circuit 29 is provided between the capacitor 28 and each functional unit. The power supply circuit 29 is a functional unit that appropriately converts and adjusts the voltage value and the like so that the power supplied from the capacitor 28 is suitable for each functional unit to which the power is supplied.

A scintillator layer (not shown) that absorbs radiation incident from the radiation incident surface X and converts it into light having a wavelength including visible light is formed inside the radiation incident surface X (see FIG. 3) of the housing 21. As the scintillator layer, for example, a layer formed by using a phosphor in which a luminescent center substance is activated in a mother body such as CsI: Tl, Gd ₂ O ₂ S: Tb, ZnS: Ag, or the like can be used.

  A plurality of photoelectric conversion elements 23 (see FIG. 4) for converting light output from the scintillator layer into electric signals are two-dimensionally provided on the surface of the scintillator layer opposite to the surface on which radiation is incident. A sensor panel unit 24 is provided as the arranged detection means. The photoelectric conversion element 23 is, for example, a photodiode, and constitutes a radiation detection element that converts the radiation transmitted through the subject into an electrical signal together with the scintillator layer and the like.

  In the present embodiment, the reading unit 45 (see FIG. 4) is a reading unit that reads the output value of each photoelectric conversion element 23 of the sensor panel unit 24 by the main body control unit 30, the scanning drive circuit 32, the signal reading circuit 33, and the like. ) Is configured.

The configurations of the sensor panel unit 24 and the reading unit 45 will be further described with reference to the equivalent circuit diagram of FIG.
As shown in FIG. 4, one electrode of each photoelectric conversion element 23 of the sensor panel unit 24 is connected to a source electrode of a TFT 46 that is a signal reading switch element. In addition, a bias line Lb is connected to the other electrode of each photoelectric conversion element 23, and the bias line Lb is connected to a bias power supply 36, and a reverse bias voltage is applied from the bias power supply 36 to each photoelectric conversion element 23. It has come to be.

  The gate electrode of each TFT 46 is connected to a scanning line Ll extending from the scanning drive circuit 32, and a read voltage (ON voltage) or OFF voltage is applied to the gate electrode of the TFT 46 from a TFT power source (not shown) via the scanning line Ll. Is applied. The drain electrode of each TFT 46 is connected to the signal line Lr. Each signal line Lr is connected to an amplifier circuit 37 in the signal readout circuit 33, and an output line of each amplifier circuit 37 is connected to an analog multiplexer 39 via a sample hold circuit 38. The signal readout circuit 33 is connected to an A / D converter 40 as processing means for converting the signal into a digital signal. The analog image signal sent from the analog multiplexer 39 is an A / D converter. 40 is converted into a digital image signal. The signal readout circuit 33 is connected to the main body control unit 30 via the A / D conversion unit 40, and a digital image signal is output to the main body control unit 30. A storage unit 31 is connected to the main body control unit 30, and the main body control unit 30 stores the digital image signal sent from the A / D conversion unit 40 in the storage unit 31 as image data. Yes.

  The main body control unit 30 is a computer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like (not shown), and comprehensively controls the entire radiographic imaging apparatus 2.

The ROM stores a live-action image data generation process, an offset correction value generation process, a program for performing various processes in the radiation image capturing apparatus 2, various control programs, parameters, and the like.
The main body control unit 30 reads a predetermined program stored in the ROM, develops it in the work area of the RAM, and the CPU executes various processes according to the program.

  The signal processing unit 34 is a functional unit that converts the image data into data in a format suitable for output to the outside by performing predetermined signal processing on the image data.

The storage unit 31 includes, for example, an HDD (Hard Disk Drive), a flash memory, or the like, and the storage unit 31 includes real image data generated by the reading unit 45 (see FIG. 4) (radiation transmitted through the subject). Based image data), dark image data (image data acquired without radiation), and the like are stored.
The storage unit 31 may be a built-in memory or a removable memory such as a memory card. Further, the capacity is not particularly limited, but preferably has a capacity capable of storing a plurality of pieces of image data. By providing such a storage means, it is possible to continuously irradiate a subject with radiation, and to record and accumulate image data each time, enabling continuous shooting and moving image shooting. Become.

The communication unit 35 is connected to the antenna device 71, and transmits / receives various signals to / from an external device such as the console 101 under the control of the main body control unit 30. The communication unit 35 communicates with an external device such as the console 101 in a wireless manner via the wireless access point 113 (see FIG. 9).
In the present embodiment, the communication unit 35 transmits image data based on an image signal read by the reading unit 45 and converted from an analog signal to a digital signal by the A / D conversion unit 40 to the console 101 which is an external device and the console. The imaging order information and the like are received from 101 and the like.

FIG. 5 is a main part configuration diagram in which only the configuration for charging the capacitor 28 in the radiographic imaging device 2 is extracted.
The radiographic imaging apparatus 2 is used and charged with the two capacitors 28 and 28 connected in series. In the description of the embodiment, when it is necessary to distinguish between the two capacitors, “capacitors 28A and 28B” are used. When there is no need to distinguish between the two capacitors, “capacitor 28” is used. .

  As shown in FIG. 5, the radiographic imaging device 2 includes a charging circuit 61 that charges two capacitors at the same time individually or in a state connected to the capacitors 28A and 28B, and a charging circuit for the capacitors 28A and 28B. 61, the connection switching means 62 that can switch the connection state, voltage detection means 63 that detects the voltages of the capacitors 28A and 28B, and a charge control unit that controls the charge state according to the detected voltages of the capacitors 28A and 28B. As a charging control circuit 64.

Each capacitor 28 </ b> A, 28 </ b> B is connected to the charging circuit 61 via the switches SW <b> 1 to SW <b> 4 of the connection switching means 62, with the wires drawn out from the both polar sides. The charging circuit 61 includes two positive ports P1 and P3 and two negative ports P2 and P4, and the positive port P1 is connected to the positive electrode of the capacitor 28A via the wiring described above. The port P3 is connected to the positive electrode of the capacitor 28B, the negative port P2 is connected to the negative electrode of the capacitor 28A, and the negative port P4 is connected to the negative electrode of the capacitor 28B.
The charging circuit 61 can perform constant current charging for the capacitors 28A, 28B or both connected between the two positive ports P1 or P3 and the two negative ports P2 or P4. It is possible.

  As described above, the connection switching unit 62 is connected between the switch SW1 provided between the positive port P1 of the charging circuit 61 and the positive electrode of the capacitor 28A, and between the negative port P2 and the negative electrode of the capacitor 28A. A switch SW2 provided, a switch SW3 provided between the positive port P3 and the positive electrode of the capacitor 28B, and a switch SW4 provided between the negative port P4 and the negative electrode of the capacitor 28B. ing. Each of these switches SW1 to SW4 can be controlled to be turned on and off by the charge control circuit 64, and only the capacitor 28A is charged by turning on only two of SW1 and SW2. When only two of SW3 and SW4 are turned on, only the capacitor 28B is charged, and when only two of SW1 and SW4 are turned on, the capacitors 28A and 28B connected in series are simultaneously charged. The connection state is switched.

The voltage detection means 63 pulls out the wirings L1 and L2 for performing voltage detection from the positive electrode of the capacitor 28A and the positive electrode of the capacitor 28B, and the analog voltage value obtained through each of the wirings L1 and L2 is the charge control circuit 64. It is acquired as digital data by an AD converter 65 provided therein.
The voltages Vm1 and Vm2 detected by the wirings L1 and L2 are both potential differences when the negative electrode side of the capacitor 28B is used as a reference potential.
Therefore, if the voltages of the capacitors 28A and 28B are Vc1 and Vc2, the voltage Vm2 detected from the wiring L2 becomes the voltage Vc2 itself of the capacitor 28B (Vm2 = Vc2), but the voltage Vm1 detected from the wiring L1 is in series. The total voltage (Vc1 + Vc2) of the connected capacitors 28A and 28B is detected. Therefore, the voltage Vc1 of the capacitor 28A alone is calculated by Vm1-Vm2.

The control performed by the charge control circuit 64 will be specifically described with reference to FIGS. FIG. 6 illustrates each connection state in a table format, FIG. 7 is a state transition diagram of the connection state at the time of charging by the charge control circuit 64, and FIG. 8 is a diagram illustrating a voltage change in each connection state. It is.
The charge control circuit 64 calculates the voltages Vc1 and Vc2 of the capacitors 28A and 28B from the voltages Vm1 and Vm2 acquired through the AC converter 65 in the state where the external power supply is connected to the radiation imaging apparatus 2, and these When the voltages Vc1 and Vc2 are less than the predetermined first target voltage V1 of the capacitor, the two capacitors 28A and 28B are charged at the same time, and the first target voltage V1 is reached or charged. For the capacitor 28A or 28B that has reached one target voltage V1, the connection switching means 62 is controlled so as not to be charged. The charge control circuit 64 is configured by, for example, an IC chip.
The first target voltage V1 is preferably set to a value that is the same as or slightly lower than the rated voltage of each capacitor 28A, 28B.

In order to realize the above-described charging control, the charging control circuit 64 supplies the connection switching means 62 with the connection state A in which neither capacitor 28A, 28B is charged, as shown in FIG. 6, the two capacitors 28A, 28B. Control is performed to switch to four connection states A to D including a connection state B in which charging is possible simultaneously, a connection state C in which only capacitor 28B is chargeable, and a connection state D in which only capacitor 28A is chargeable (described later) Then, “connection state E” also appears, but since this is the same state as connection state A, there are substantially four types of connection states).
That is, in the charge control circuit 64, when the connection state A is set, all the switches SW1 to SW4 of the connection switching unit 62 are all OFF, and when the connection state B is set, the switches SW1 and SW4 of the connection switching unit 62 are ON. , SW2 and SW3 are controlled to be OFF. When the connection state C is set, the switches SW1 and SW2 of the connection switching unit 62 are OFF and SW3 and SW4 are ON. When the connection state D is set, the switches SW1 and SW2 of the connection switching unit 62 are ON and SW3. , SW4 is controlled to be OFF.

Next, charging control performed by the charging control circuit 64 will be described in detail with reference to FIG. 7 based on the relationship between the detected voltages of the capacitors 28A and 28B and the switching of the connection state.
Initially, the connection switching means 62 is in the connection state A, and voltage detection of each capacitor 28A, 28B is performed in a state where the radiographic imaging apparatus 2 is connected to an external power source.
As a result, when neither of the capacitors 28A and 28B reaches the first target voltage V1 (Vc1 <V1, Vc2 <V1), the charge control circuit 64 switches the connection switching means 62 to the connection state B, Thus, the two capacitors 28A and 28B are switched to a state where they are charged simultaneously.

In the connection state A, when only the capacitor 28A has reached the first target voltage V1 (Vc1 ≧ V1, Vc2 <V1), the charge control circuit 64 switches the connection switching means 62 to the connection state C, Thereby, it switches to the state in which only the capacitor 28B is charged.
Further, in the connection state A, when only the capacitor 28B has reached the first target voltage V1 (Vc1 <V1, Vc2 ≧ V1), the charge control circuit 64 switches the connection switching means 62 to the connection state D, As a result, only the capacitor 28A is switched to a charged state.

In the connection state B, when the capacitor 28A first reaches the first target voltage V1 by charging (Vc1 ≧ V1, Vc2 <V1), the charge control circuit 64 sets the connection switching means 62 to the connection state C. Thus, the charging state of only the capacitor 28B is switched.
In the connection state B, when the capacitor 28B first reaches the first target voltage V1 by charging (Vc1 <V1, Vc2 ≧ V1), the charging control circuit 64 sets the connection switching means 62 to the connection state D. Thus, the charging state of only the capacitor 28A is switched.

In the connection state C, when the capacitor 28B reaches the first target voltage V1 by charging (Vc1 ≧ V1, Vc2 ≧ V1), the charging control circuit 64 connects the connection switching means 62 to the connection state E (= connection). Switch to state A).
In the connection state D, when the capacitor 28A reaches the first target voltage V1 by charging (Vc1 ≧ V1, Vc2 ≧ V1), the charging control circuit 64 connects the connection switching means 62 to the connection state E (= connection). Switch to state A).

FIG. 8 shows an example of a state change until charging is completed in the order of state A → state C → state E (state A). That is, the voltages Vc1 and Vc2 of the two capacitors 28A and 28B are both less than the first target voltage V1, and the voltage is simultaneously applied from the charging circuit 61 to the capacitors 28A and 28B that are switched to the connection state B and connected in series. Then, the voltage of each capacitor 28A, 28B rises with a specific slope according to the individual error of each capacitance.
In this example, the capacitor 28A reaches the first target voltage V1 earlier, and the switching to the connection state C cuts off the application of the charging voltage to the capacitor 28A, and the charging voltage is applied only to the capacitor 28B. Done.
As a result, the capacitor 28B reaches the first target voltage V1 and charging is performed until both the capacitors 28A and 28B reach the first target voltage V1, so that the connection state E is switched, and the charging control is temporarily performed. Is terminated.

  The charging control may be performed periodically when the radiographic imaging device 2 is connected to an external power source. Further, even when radiographic image capturing by the radiographic image capturing apparatus 2 is being performed, if the external power supply is connected, charging control may be performed in parallel with the capturing.

  In addition, this radiographic image detection system 1 is arrange | positioned and used in the radiographic imaging system 100 as shown, for example in FIG.

  The radiographic image capturing system 100 includes, for example, the radiographic image detection system 1 and a console 101 that can communicate with the radiographic image capturing apparatus 2 constituting the radiographic image detection system 1.

As shown in FIG. 9, the radiographic imaging device 2 is provided in an imaging room R1 that performs imaging of a subject that is a part of the patient M (an imaging target site of the patient M) by irradiating radiation, for example. The console 101 is provided corresponding to the photographing room R1.
In the present embodiment, a case where one radiographing room R1 is provided in the radiographic imaging system and three radiographic imaging apparatuses 2 are arranged in the radiographic room R1 will be described as an example. The number of imaging rooms and the number of radiation image capturing apparatuses 2 provided in each imaging room are not limited to the illustrated example.
Further, when there are a plurality of shooting rooms R1, the console 101 may not be provided corresponding to each shooting room R1, and one console 101 may be associated with the plurality of shooting rooms R1. Good.

In the radiographing room R1, a bucky device 110 having a cassette holding unit 111 capable of loading and holding the radiographic imaging device 2, and a radiation source such as an X-ray tube that irradiates the subject (the imaging target site of the patient M) A radiation generator 112 is provided which comprises (not shown). The cassette holding unit 111 is for loading the radiographic image capturing apparatus 2 at the time of photographing.
Note that FIG. 9 illustrates a case where one of the bucky devices 110a for standing position shooting and one of the bucky devices 110b for standing position shooting are provided in the shooting room R1. The number of the bucky devices 110 provided in is not particularly limited. Further, in the present embodiment, a configuration in which one radiation generation device 112 is provided corresponding to each Bucky device 110 is illustrated, but for example, one radiation generation device 112 is provided in the imaging room R1. One radiation generation device 112 may correspond to a plurality of the bucky devices 110, and may be used by appropriately moving the position or changing the radiation irradiation direction.

  In addition, since the radiographing room R1 is a room that shields radiation and radio waves for radio communication are blocked, the radiographic imaging apparatus 2 communicates with an external device such as the console 101 in the radiographing room R1. Are provided with a wireless access point (base station) 113 for relaying these communications.

  In the present embodiment, a front room R2 is provided adjacent to the photographing room R1. In the anterior chamber R2, a radiographer, a doctor, etc. (hereinafter referred to as an “operator”) control the tube voltage, tube current, irradiation field stop, etc. of the radiation generator 112 that irradiates the subject with radiation. An operation device 114 for operating the device 110 is disposed.

  A control signal for controlling the radiation irradiation condition of the radiation generating device 112 is transmitted from the console 101 to the operation device 114, and the radiation irradiation condition of the radiation generating device 112 is transmitted to the console 101. It is set according to the control signal from. Examples of radiation irradiation conditions include exposure start / end timing, radiation tube current value, radiation tube voltage value, filter type, and the like.

  An exposure instruction signal for instructing radiation exposure is transmitted from the operation device 114 to the radiation generation apparatus 112. The radiation generation apparatus 112 applies predetermined radiation according to the exposure instruction signal for a predetermined time, Irradiation is performed at a predetermined timing.

The console 101 is a computer including a control unit configured by a CPU (Central Processing Unit), a storage unit, an input unit, a display unit, a communication unit (all not shown), and the like.
The console 101 displays an image based on the image data sent from the radiation image capturing apparatus 2 on the display unit, and performs various image processing on the image data.
In the present embodiment, the console 101 is connected to external devices such as the HIS / RIS 121, the PACS server 122, and the imager 123 via the network N.

In the radiographic imaging system 100, the radiographic image capturing apparatus 2 is in a disconnected state with respect to the cradle 4 or the power supply cable 5, and a radiographic image is captured and is in a connected state with respect to the cradle 4 or the power supply cable 5. The radiographic image capturing and charging are performed individually or in parallel.
The cradle 4 and the power supply cable 5 constitute part of the radiographic image capturing system 100, but are not shown in FIG.

Here, the charging control performed by the radiation image capturing apparatus 2 will be described with reference to FIG.
When the radiographic imaging device 2 is connected to the cradle 4 or the power supply cable 5, the power supply state from the external power supply is entered, and the charge control circuit 64 first switches the connection switching unit 62 to the connection state A (step S1). Thereby, each capacitor 28A, 28B is in a non-energized state. Then, the charging control circuit 64 starts measuring a determination time for detecting an error state in which the voltage does not increase even when charging is started (step S3).

Next, it is determined whether or not the detected voltage Vc1 of the capacitor 28A is equal to or higher than the first target voltage V1 (step S5). If the voltage Vc2 of the capacitor 28B is less than the first target voltage V1, the voltage Vc2 of the capacitor 28B is It is determined whether or not the voltage is equal to or higher than one target voltage V1 (step S7).
When the capacitor 28B also does not reach the first target voltage V1, the connection switching unit 62 is switched to the connection state B (step S9), and both the capacitors 28A and 28B are charged in series.

  And here, the charge control part 64 performs an error determination (step S11). Such an error determination is made when the voltages Vc1 and Vc2 of any one of the capacitors 28A or 28B do not reach the first target voltage V1 until a predetermined error determination time elapses from the start of timing. That is, when the error determination time has already elapsed in step S11, it is determined that there is an error, and the charging control circuit 64 executes notification processing (step S13). Here, as the notification process, a process of inputting an error occurrence signal to the main body control unit 30 of the radiographic image capturing apparatus 2 is performed. In response to the input of the error occurrence signal, the main body control unit 30 blinks the indicator 25 to notify the outside of the occurrence of the error.

  If no error is determined in step S11, the process returns to step S5 to determine again whether or not the voltages Vc1 and Vc2 of the capacitors 28A and 28B have reached the first target voltage V1. Is done.

In Step S5 described above, when it is determined that the voltage Vc1 of the capacitor 28A is equal to or higher than the first target voltage V1, the charge control circuit 64 determines whether or not the voltage Vc2 of the capacitor 28B is equal to or higher than the first target voltage V1. Determination is made (step S15).
If the capacitor 28B is also equal to or higher than the first target voltage V1, the connection switching unit 62 is switched to the connection state E (step S17), and the process ends.

On the other hand, when it is determined in step S15 that the voltage Vc2 of the capacitor 28B is less than the first target voltage V1, the charge control circuit 64 switches the connection switching unit 62 to the connection state C (step S19), and the capacitor 28B. Only charge state.
Furthermore, the charging control unit 64 performs error determination (step S21), and executes an informing process when the error determination time has elapsed from the start of timing (step S23). The notification process is the same as in step S13.
If the error is not determined, the process returns to step S15, and it is determined again whether or not the voltage Vc2 of the capacitor 28B has reached the first target voltage V1.

In Step S7 described above, when the voltage Vc2 of the capacitor 28B is determined to be equal to or higher than the first target voltage V1, the charge control circuit 64 switches the connection switching unit 62 to the connection state D (Step S25), and the capacitor Only 28A is charged.
Then, the charge control circuit 64 determines again whether or not the voltage Vc1 of the capacitor 28A is equal to or higher than the first target voltage V1 (step S27).
If the capacitor 28A is also equal to or higher than the first target voltage V1, the connection switching unit 62 is switched to the connection state E (step S29), and the process ends.

On the other hand, when the capacitor 28A is less than the first target voltage V1 in step S27, the charge control circuit 64 performs error determination (step S31), and when the error determination time has elapsed from the start of timing. Performs a notification process (step S33). The notification process is the same as in step S13.
If the error is not determined, the process returns to step S27, and it is determined again whether or not the voltage Vc1 of the capacitor 28A has reached the first target voltage V1.

As described above, the radiographic imaging apparatus 2 can charge by connecting the single charging circuit 61 to each of the capacitors 28A and 28B by switching the connection switching unit 62, or connecting the capacitors 28A and 28B in series. It is also possible to charge at the same time in the state.
Then, the charging control circuit 64 monitors the voltages Vc1 and Vc2 of the capacitors 28A and 28B at the time of charging, and when both are less than the first target voltage V1, the capacitors 28A and 28B are connected in series. In the case where one capacitor 28A or 28B is equal to or higher than the first target voltage V1, the connection switching unit 62 is charged so that only the capacitor 28A or 28B that does not satisfy the first target voltage V1 is charged. Take control.
For this reason, it is possible to charge the two capacitors 28A and 28B at high speed by the single charging circuit 61. Furthermore, the overcharge of each capacitor 28A and 28B can be avoided and proper charging can be performed. It becomes possible.
As a result, it is not necessary to provide a charging circuit for each of the capacitors 28A and 28B, and the radiographic imaging device 2 can be downsized.

  Further, in the radiographic imaging apparatus 2, during charging, the charge control circuit 64 performs error determination according to the elapsed time from the start of charging, so that each component that performs charging including the capacitors 28A and 28B is deteriorated, damaged, or the like. Even if a failure of charging occurs and a state in which charging is impossible occurs, this can be quickly detected and notified to an operator or the like.

  The radiological image detection apparatus 2 includes capacitors 28A and 28B as power supplies for supplying power to each functional unit. However, the chargeable power storage unit is not limited to this. A rechargeable secondary battery such as a battery, a nickel metal hydride battery, a lithium ion battery, a small sealed lead battery, or a lead storage battery may be mounted, and the above-described configurations and controls in charging may be applied.

  In the radiographic imaging apparatus 2, the charging control circuit 64 is provided separately from the main body control unit 30 to perform charging control of the capacitors 28 </ b> A and 28 </ b> B. However, the charging control circuit 64 is not provided without providing the charging control circuit 64. It is good also as a structure which the main body control part 30 performs the same function.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIG. FIG. 11 is a state transition diagram of the connection state during charging by the charging control circuit 64.
In the second embodiment, the charge control performed by the charge control circuit 64 of the radiographic imaging apparatus 2 and the charge circuit 61 can switch between constant current control and constant voltage control according to the control command of the charge control circuit 64. In other respects, the configuration is the same as that of the first embodiment.

In the radiographic image capturing apparatus 2 according to the first embodiment, when charging the capacitors 28A and 28B, charging is performed only by constant current charging. However, constant current charging takes into account the voltage drop caused by environmental temperature effects and wiring resistance variations from cassette to cassette, and provides a margin so that the maximum voltage rating of the capacitor is not exceeded. It is desirable to set
Therefore, in the second embodiment, the charge control circuit 64 has the first target voltage V1 that is somewhat lower than the rated voltage of the capacitor and the second target voltage V2 that is the same as or closer to the rated voltage. The constant current charging is performed by the same process as in the first embodiment until both capacitors 28A and 28B reach the first target voltage V1, and then each capacitor 28A and 28B until the second target voltage is reached. The charging control is performed so as to perform constant voltage charging.

The charge control performed by the charge control circuit 64 will be described with reference to FIG. 11. Initially, when the connection switching unit 62 is maintained in the connection state A and the radiation imaging apparatus 2 is connected to an external power source, each capacitor 28A, 28B voltage detection is performed.
As a result, when neither of the capacitors 28A and 28B reaches the first target voltage V1 (Vc1 <V1, Vc2 <V1), the charging control circuit 64 switches the connection switching means 62 to the connection state B and controls it. The circuit 61 is controlled to perform constant current charging. Thereby, constant current charging is performed simultaneously on the two capacitors 28A and 28B.

In the connection state A, when only the capacitor 28A has reached the first target voltage V1 (Vc1 ≧ V1, Vc2 <V1), the charging control circuit 64 switches the connection switching means 62 to the connection state C. The control circuit 61 controls to perform constant current charging. As a result, constant current charging is performed only on the capacitor 28B.
Further, in the connection state A, when only the capacitor 28B reaches the first target voltage V1 (Vc1 <V1, Vc2 ≧ V1), the charge control circuit 64 switches the connection switching means 62 to the connection state D. The control circuit 61 controls to perform constant current charging. Thereby, constant current charging is performed only for the capacitor 28A.

In the connection state B, when the capacitor 28A first reaches the first target voltage V1 by constant current charging (Vc1 ≧ V1, Vc2 <V1), the charge control circuit 64 connects the connection switching unit 62 to the connection state B. By switching to C, this switches to the constant current charge state of only the capacitor 28B.
In the connection state B, when the capacitor 28B first reaches the first target voltage V1 by constant current charging (Vc1 <V1, Vc2 ≧ V1), the charge control circuit 64 connects the connection switching unit 62 to the connection state B. In this manner, the constant current charging state of only the capacitor 28A is switched.

In the connection state C, when the capacitor 28B reaches the first target voltage V1 by constant current charging (Vc1 ≧ V1, Vc2 ≧ V1), the charging control circuit 64 sets the connection switching means 62 to the connection state D. At the same time, the control circuit 61 controls to perform constant voltage charging. Thereby, only the capacitor 28A is charged at a constant voltage.
In the connection state D, when the capacitor 28A reaches the first target voltage V1 by constant current charging (Vc1 ≧ V1, Vc2 ≧ V1), the charge control circuit 64 performs control while maintaining the connection state D. Control is performed so that the circuit 61 performs constant voltage charging. Thereby, only the capacitor 28A is charged at a constant voltage.

When the capacitor 28A reaches the second target voltage V2 in the connection state D with constant voltage charging (Vc1 ≧ V2, Vc2 <V2), the charging control circuit 64 connects the connection switching unit 62 to the connection state C. And constant voltage charging of the control circuit 61 is maintained. Thereby, only the capacitor 28B is charged at a constant voltage.
When the capacitor 28B reaches the second target voltage V2 (Vc1 ≧ V2, Vc2 <V2), the charge control circuit 64 switches the connection switching unit 62 to the connection state E (= connection state A).
The constant voltage charging may be performed in the order of the capacitor 28B and the capacitor 28A.

  As described above, in the second embodiment, charging to the first target voltage V1 is performed at a relatively high speed by performing charging of the capacitors 28A and 28B in stages by constant current control and constant voltage control. In addition, it is possible to charge to the second target voltage V2 with higher accuracy and more effectively avoid overcharging of the capacitors 28A and 28B.

[Third Embodiment]
A third embodiment of the present invention will be described with reference to FIGS.
In the first embodiment, the case where the radiographic image capturing apparatus 2 includes two capacitors 28A and 28B is illustrated. However, the present invention can be applied even when there are three or more capacitors. . In the third embodiment, a configuration for performing charging when the radiographic image capturing apparatus 2A includes three capacitors 28A, 28B, and 28C will be described. In addition, about the structure same as 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description shall be abbreviate | omitted.

FIG. 12 is a main part configuration diagram extracting only the configuration for charging the three capacitors 28A, 28B, and 28C in the radiographic image capturing apparatus 2A.
In the radiographic imaging apparatus 2A, the three capacitors 28A, 28B, and 28C are used and charged in a state where they are connected in series.
As shown in FIG. 12, the radiographic imaging apparatus 2A includes two capacitors 28A and 28B or 28B and 28C that are individually or serially connected to the capacitors 28A, 28B, and 28C, or three capacitors 28A that are connected in series. , 28B, 28C simultaneously, a charging circuit 61A, connection switching means 62A for switching the connection state of the charging circuit 61 to each capacitor 28A, 28B, 28C, and the voltages of the capacitors 28A, 28B, 28C are detected. And a charge control circuit 64A as a charge control unit for controlling the charge state in accordance with the detected voltage of each capacitor 28A, 28B, 28C.

The capacitors 28A, 28B, and 28C are connected to the charging circuit 61A via the switches SW1 to SW6 of the connection switching means 62, with the wirings being drawn out from the respective polar sides. The charging circuit 61A includes three positive ports P1, P3, and P5 and three negative ports P2, P4, and P6. The positive port P1 is connected to the positive electrode of the capacitor 28A through the above-described wiring. The positive port P3 is connected to the positive electrode of the capacitor 28B, the positive port P5 is connected to the positive electrode of the capacitor 28C, the negative port P2 is connected to the negative electrode of the capacitor 28A, and the negative port P4 is The negative port P6 is connected to the negative electrode of the capacitor 28B, and the negative port P6 is connected to the negative electrode of the capacitor 28C.
This charging circuit 61A is connected to capacitors 28A, 28B, and 28C connected between any of the three positive ports P1, P3, or P5 and any of the three negative ports P2, P4, or P6. It is possible to perform constant current charging. That is, constant current charging can be performed for each of the capacitors 28A, 28B, and 28C, or constant current charging can be performed for two or three capacitors 28A, 28B, and 28C connected in series. On the other hand, constant current charging cannot be performed simultaneously on the capacitors 28A, 28C on both sides except for the middle capacitor 28B.

  Each of the switches SW1 to SW6 of the connection switching means 62A can be controlled to be turned on and off by the charge control circuit 64A.

The voltage detection means 63A pulls out the wirings L1, L2, and L3 that perform voltage detection from the positive electrodes of the capacitors 28A, 28B, and 28C, and the analog voltage values obtained through the wirings L1, L2, and L3 are charged. It is acquired as digital data by an AD converter 65A provided in the circuit 64A.
The voltages Vm1, Vm2, and Vm3 detected by the wirings L1, L2, and L3 are all potential differences when the negative electrode side of the capacitor 28C is used as a reference potential.
Therefore, when the voltages of the capacitors 28A, 28B, and 28C are Vc1, Vc2, and Vc3, the voltage Vm3 detected from the wiring L3 becomes the voltage Vc3 itself of the capacitor 28C (Vm3 = Vc3), but is detected from the wiring L2. The voltage Vm2 is the sum of the voltages of the capacitors 28B and 28C connected in series (Vc2 + Vc3), and the voltage Vm1 detected from the wiring L1 is the sum of the voltages of the capacitors 28A, 28B and 28C connected in series (Vc1 + Vc2 + Vc3). Is detected. Therefore, the voltage Vc2 of the capacitor 28B alone is calculated by Vm2-Vm3, and the voltage Vc1 of the capacitor 28A alone is calculated by Vm1-Vm2.

The control performed by the charging control circuit 64A will be specifically described with reference to FIGS. FIG. 13 illustrates each connection state in a table format, and FIG. 14 is a state transition diagram of the connection state during charging by the charge control circuit 64A.
The charge control circuit 64A is connected to the radiation image capturing apparatus 2A with an external power supply, and the voltages Vc1, Vc2, Vc3 of the capacitors 28A, 28B, 28C from the voltages Vm1, Vm2, Vm3 acquired through the AD converter 65A. When these voltages Vc1, Vc2, and Vc3 are less than a predetermined first target voltage V1 of the capacitor, the three capacitors 28A and 28B are charged simultaneously, and the first target voltage V1 For the capacitor 28A, 28B, or 28C that has reached the first target voltage V1 due to charging, the connection switching means 62A is controlled so as not to be charged. The charging control circuit 64A is configured by, for example, an IC chip.
The first target voltage V1 is preferably set to a value that is the same as or slightly lower than the rated voltage of each capacitor 28A, 28B, 28C.

In order to realize the above charge control, the charge control circuit 64A provides a connection state a in which none of the capacitors 28A, 28B, 28C is charged with respect to the connection switching means 62A, as shown in FIG. Connection state b that allows 28B and 28C to be charged simultaneously, connection state c that allows two capacitors 28A and 28B to be charged simultaneously, connection state d that allows two capacitors 28B and 28C to be charged simultaneously, and charging only capacitor 28A The control is switched to seven connection states a to g including a connection state “e”, a connection state “f” in which only the capacitor 28B can be charged, and a connection state “g” in which only the capacitor 28C can be charged. State h "also appears, but since this is the same state as the connection state a, there are virtually seven types of connection states. ).
That is, in the charge control circuit 64A, all the switches SW1 to SW6 of the connection switching unit 62A are turned OFF when the connection state a is set, and only the switches SW1 and SW6 of the connection switching unit 62A are set when the connection state b is set. When the connection state c is ON, only the switches SW1 and SW4 of the connection switching means 62A are ON. When the connection state d is only the switches SW3 and SW6 of the connection switching means 62A are ON and the connection state e is set. Only the switches SW1 and SW2 of the connection switching means 62A are ON. When the connection state f is set, only the switches SW3 and SW4 of the connection switching means 62A are ON and when the connection state g is set, the switch of the connection switching means 62A is set. Control is performed so that only SW5 and SW6 are turned ON.

Next, charging control performed by the charging control circuit 64A will be described in detail with reference to FIG. 14 based on the relationship between the detected voltages of the capacitors 28A, 28B, and 28C and the switching of the connection state.
Initially, the connection switching means 62A is in the connection state a, and voltage detection of each capacitor 28A, 28B, 28C is performed in a state in which the radiation image capturing apparatus 2 is connected to an external power source.
As a result, when none of the capacitors 28A, 28B, 28C reaches the first target voltage V1 (Vc1 <V1, Vc2 <V1, Vc3 <V1), the charge control circuit 64A connects the connection switching means 62A. Switching to the state b, thereby switching to the state where the three capacitors 28A, 28B, 28C are charged simultaneously.

In the connection state a or the connection state b, when only the capacitor 28C reaches the first target voltage V1 (Vc1 <V1, Vc2 <V1, Vc3 ≧ V1), the charge control circuit 64A uses the connection switching means. 62A is switched to the connection state c, whereby the capacitors 28A and 28B are switched to a charged state.
Further, in the connection state a or the connection state b, when only the capacitor 28A has reached the first target voltage V1 (Vc1 ≧ V1, Vc2 <V1, Vc3 <V1), the charge control circuit 64A uses the connection switching means. 62A is switched to the connection state d, whereby the capacitors 28B and 28C are switched to a charged state.
In the connection state a or the connection state b, when only the capacitor 28B reaches the first target voltage V1 (Vc1 <V1, Vc2 ≧ V1, Vc3 <V1), the charge control circuit 64A uses the connection switching means. 62A is switched to the connection state e, whereby only the capacitor 28A is switched to a charged state.

Next, in the connection state c, when the capacitor 28B reaches the first target voltage V1 (Vc1 <V1, Vc2 ≧ V1, Vc3 ≧ V1), the charge control circuit 64A connects the connection switching means 62A to the connection state e. Thereby, only the capacitor 28A is switched to a charged state.
On the other hand, when the capacitor 28A reaches the first target voltage V1 in the connection state c (Vc1 ≧ V1, Vc2 <V1, Vc3 ≧ V1), the charge control circuit 64A places the connection switching means 62A in the connection state f. In this way, only the capacitor 28B is charged.

In the connection state d, when the capacitor 28C reaches the first target voltage V1 (Vc1 ≧ V1, Vc2 <V1, Vc3 ≧ V1), the charge control circuit 64A places the connection switching unit 62A in the connection state f. In this way, only the capacitor 28B is charged.
On the other hand, in the connection state d, when the capacitor 28B reaches the first target voltage V1 (Vc1 ≧ V1, Vc2 ≧ V1, Vc3 <V1), the charge control circuit 64A places the connection switching means 62A in the connection state g. This switches to a state where only the capacitor 28C is charged.

  Further, in the connection state e where only the capacitor 28B has reached the first target voltage V1, when the capacitor 28A has reached the first target voltage V1 (Vc1 ≧ V1, Vc2 ≧ V1) , Vc3 <V1), the charging control circuit 64A switches the connection switching means 62A to the connection state g, thereby switching to a state where only the capacitor 28C is charged.

  When all the capacitors 28A, 28B, 28C reach the first target voltage V1 in the connection state e, connection state f, or connection state g (Vc1 ≧ V1, Vc2 ≧ V1, Vc3 ≧ V1), the charge control circuit 64A switches the connection switching means 62A to the connection state h (= connection state a).

  As described above, in the radiographic imaging apparatus 2A, even when the three capacitors 28A, 28B, and 28C are mounted, charging can be performed by the single charging circuit 61A, and the state of being connected in series under a certain condition 2 to 3 capacitors are charged at the same time, so that the charging speed can be increased. Further, when any of the capacitors 28A, 28B, 28C reaches the first target voltage V1, Therefore, it is possible to effectively suppress the occurrence of overvoltage. Thus, it is not necessary to provide a charging circuit for each of the capacitors 28A, 28B, and 28C, and it is possible to reduce the size of the radiation image capturing apparatus 2A.

Note that, when there are four or more capacitors, the same effect can be obtained as in the above three cases.
In the charging control, when the middle capacitor 28B first reaches the first target voltage V1, charging is performed in the order of the capacitor 28A and the capacitor 28C thereafter, but these are performed in the reverse order. May be.
Also in the case of the third embodiment, as in the second embodiment, after the constant current charging is performed up to the first target voltage V1 for all the capacitors 28A, 28B, and 28C, the second target voltage is set. You may comprise so that constant voltage charge may be performed to V2.

[Fourth Embodiment]
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 15 is a main part configuration diagram mainly illustrating a configuration for charging the capacitors 28A and 28B mounted on the radiographic image capturing apparatus 2B according to the fourth embodiment.
Note that in the fourth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
In this embodiment, the radiographic imaging device 2 is provided with the charging circuit 61 and the charging control circuit 64 provided inside the housing 21 outside the radiographic imaging device 2B, that is, in the cradle 4B. It is a feature.
Therefore, the connection from the charging circuit 41 to the connection switching unit 62 is performed through the device-side connector unit 26 and the cradle output connector unit 42, and similarly, each of the capacitors 28A and 28B is detected in order to detect the voltages of the capacitors 28A and 28B. Wirings L1 and L2 as voltage detecting means 63 for connecting the capacitors 28A and 28B and the charging control circuit 64 are also connected to each other via the device side connector part 26 and the cradle output connector part 42.
Even in such a configuration, charge control can be performed in the same manner as in the first embodiment, and thereby the same effect can be obtained. In addition, since the number of connection terminals required for the apparatus-side connector portion 26 and the cradle output connector portion 42 increases, it is considered that these connector portions 26 and 42 are slightly increased in size. Since it is single, compared with the structure which prepares a charging circuit for each capacitor 28A and 28B, each connector 26 and 42 can fully be reduced in size, and in connection with this, radiographic imaging apparatus 2B Realization of downsizing.
In the fourth embodiment, the charging circuit 61 and the charging control circuit 64 are provided outside the radiation image capturing apparatus. However, only one of them may be provided outside, or other than these. For example, the connection switching unit 62 may be provided outside the radiation image capturing apparatus.

DESCRIPTION OF SYMBOLS 1 Radiographic image detection system 2 Radiographic imaging device 4 Cradle 5 Feeding cable 21 Case 26 Apparatus side connector part (power receiving side connection part)
28A, 28B, 28C Capacitor (power storage unit)
29 Power supply circuit 30 Control part 42 Cradle output connector part (power supply side connection part)
61 Charging Circuit 62 Connection Switching Unit 63 Voltage Detection Unit 64 Charging Control Circuit 100 Radiation Imaging System V1 First Target Voltage V2 Second Target Voltage

Claims (5)

A cassette-type radiation imaging apparatus capable of being driven by supplying power from each power storage unit, which includes a plurality of power storage units connected in series to supply power to each functional unit.
A power receiving side connection for receiving power supplied from an external power source;
A single charging circuit for charging each power storage unit based on the power supplied by the power receiving side connection unit;
Voltage detecting means for detecting a voltage of each of the power storage units;
Connection switching means capable of switching the connection state between each of the power storage units and the charging circuit so that charging is performed on each of the power storage units or two or more of the power storage units connected in series;
A charge control unit that controls the connection switching unit according to the voltage detected by the power storage unit by the voltage detection unit;
The charging control unit is connected to the connection switching unit so that all the power storage units connected in series are charged simultaneously when the voltages of all the power storage units do not satisfy the first target voltage. And a radiographic imaging apparatus that performs control to switch a connection state so as to exclude the power storage unit that has reached the first target voltage from a charge target.   The charging control unit counts an elapsed time from the start of charging of the power storage unit, and performs a process of notifying an error when a specified time elapses before reaching the first target voltage. The radiographic imaging apparatus according to claim 1. Determining a second target voltage higher than the first target voltage;
The charge controller is
After all the power storage units have reached the first target voltage and start charging to the second target voltage,
The charging circuit is controlled to charge each power storage unit up to the first target voltage by constant current charging and to perform constant voltage charging up to the second target voltage. The radiographic imaging apparatus according to 1 or 2. A cassette-type radiographic imaging apparatus including a plurality of power storage units connected in series for supplying power to each functional unit in a housing and a power receiving side connection unit for receiving power,
A power supply side connection unit that is detachably connected to the power reception side connection unit and supplies power to the radiation imaging apparatus,
A radiographic imaging system that charges each power storage unit when the power receiving side connection unit and the power feeding side connection unit are connected to the radiographic imaging device,
Voltage detecting means for detecting a voltage of each of the power storage units;
A single charging circuit for charging each power storage unit based on the power supplied by the power receiving side connection unit;
Connection switching means capable of switching the connection state between each of the power storage units and the charging circuit so that charging is performed on each of the power storage units or two or more of the power storage units connected in series;
A charge control unit that controls the connection switching unit according to the voltage detected by the power storage unit by the voltage detection unit;
At least the charging control unit is provided outside the radiographic imaging device, and
The charging control unit sets a connection state in which all the power storage units connected in series are simultaneously charged when the voltage of all the power storage units is less than the first target voltage with respect to the connection switching unit. The radiographic imaging system characterized by performing control to switch the connection state so as to exclude the power storage unit that has reached the first target voltage from the charging target. In the charging method of the power storage unit of the cassette type radiographic imaging apparatus including a plurality of power storage units connected in series for supplying power to each functional unit inside the casing and a power receiving side connection unit for receiving power There,
Detecting the voltage of each power storage unit,
A single unit that charges all the power storage units connected in series based on the power supplied from an external power supply source when the voltages of all the power storage units do not satisfy the first target voltage. Connect to the charging circuit and charge at the same time,
A method for charging a power storage unit of a radiographic imaging apparatus, wherein the connection state with the charging circuit is switched so that the power storage unit that has reached the first target voltage is excluded from a charge target.

Images