JP2017213188A - Mobile radiography apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile radiography apparatus capable of performing electric discharge of a capacitive circuit regardless of a simple configuration.SOLUTION: A power supply circuit is opened by opening a short-circuited switch by a control section (step S1), and when a power supply from a battery to a high-voltage generating circuit and a travel motor is cut off, electric charge of an auxiliary capacitor remains without being consumed. After opening the switch, the control section transmits a command to put on a brake, to a brake control circuit (step S2), and transmits a motor rotation command to rotate the travel motor to a motor control circuit (step S3). Operation to rotate the travel motor is performed while a brake is applied, so that residual electric charge of the auxiliary capacitor is consumed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a mobile X-ray imaging apparatus that performs X-ray imaging with electric power charged in a battery.

  In the mobile X-ray imaging apparatus, X-ray imaging such as X-ray detectors such as an X-ray tube supported by a support member and a flat panel detector is performed on a carriage provided with wheels for moving between hospital rooms. Elements to execute are mounted. In addition, such a mobile X-ray imaging apparatus is equipped with a battery in order to enable X-ray imaging to be performed at an unspecified location including a case where there is no external power supply (see Patent Document 1).

  The battery supplies power required for X-ray imaging in addition to supplying power for driving the wheels for running the apparatus, but the power supply capability of the battery may be insufficient during X-ray imaging. For this reason, in the mobile X-ray imaging apparatus disclosed in Patent Document 1, a storage capacitor is connected in parallel to the battery to compensate for insufficient power.

JP 2006-141777 A

  FIG. 9 and FIG. 10 are circuit diagrams for explaining the configuration related to the discharge of the capacitive circuit in the conventional mobile X-ray imaging apparatus.

  In a conventional mobile X-ray imaging apparatus, an X-ray tube 11 is connected to a battery 1 via a high voltage generation circuit 10. A switch 3 is disposed in a path for supplying power from the battery 1 to the high voltage generation circuit 10. The switch 3 is closed by the control of the control unit 130, and the X-ray tube 11 is closed. Is supplied with power. Further, when the switch 3 is opened by the control of the control unit 130, the power supply circuit from the battery 1 to the X-ray tube 11 is opened.

  When X-ray imaging is performed with such a mobile X-ray imaging apparatus, a large current cannot be instantaneously extracted from the battery 1 having a large output impedance. For this reason, an auxiliary capacitor 2 having a small output impedance is provided in parallel with the battery 1, and current is extracted from both the battery 1 and the auxiliary capacitor 2. Between the switch 3 and the auxiliary capacitor 2, a capacitor charge suppression resistor 4 and a charge suppression resistor short-circuit switch 5 that is opened and closed under the control of the control unit 130 are disposed. The high voltage generation circuit 10 to which power is supplied from both the battery 1 and the auxiliary capacitor 2 during X-ray imaging boosts the voltage under the control of the control unit 130 and applies the boosted voltage to the X-ray tube 11. High-power X-rays are generated.

  On the other hand, in medical electrical equipment such as a mobile X-ray imaging apparatus, international standards IEC 60601-1: 2005 and Japanese Industrial Standards JIS T0601-1: 2012 define requirements for safety and necessary functions. Yes. For the conductive portion of the capacitive circuit inside the medical electrical apparatus, a limit value is set for the residual voltage or the stored charge after being disconnected from the power source.

  In the mobile X-ray imaging apparatus driven by the battery 1, the voltage charged in the auxiliary capacitor 2 is the voltage of the battery 1 (for example, 240V), and the residual voltage of the auxiliary capacitor 2 immediately after the apparatus is turned off or The stored charge is higher than the limit value required by the standard. For this reason, it is necessary to provide some discharge means so that the residual voltage or the stored charge of the auxiliary capacitor 2 falls below the limit value.

  Conventionally, as shown in FIG. 9, a capacitor discharging resistor 104 is provided in parallel to the auxiliary capacitor 2, and after the control unit 130 opens the switch 3 by turning off the power of the apparatus, the capacitor is stored in the auxiliary capacitor 2. The charged charge was automatically discharged by the capacitor discharging resistor 104. The mobile X-ray imaging apparatus consumes the power of the battery 1 in order to maintain some functions in the control unit 130 and the circuit even when the main power supply of the apparatus is turned off. In the apparatus for performing automatic discharge by the capacitor discharging resistor 104 shown in FIG. 9, the capacitor discharging resistor 104 always consumes the battery power, and the standby power consumption is increased. For this reason, the continuous usable time of the mobile X-ray imaging apparatus per charge is shortened.

  Since the capacitor discharging resistor 104 needs to be a high power resistor, the mounting space in the mobile X-ray imaging apparatus is large. The mobile X-ray imaging apparatus is desired to be miniaturized from the viewpoint of mobility, but the mounting space for the capacitor discharging resistor 104 is also a factor that hinders miniaturization of the apparatus. In addition, weight reduction is desired for power saving, but the weight as a component hinders weight reduction, and it is impossible to reduce the load on the traveling motor that drives the wheels disposed on the cart of the apparatus. It was. In addition, parts costs were also incurred.

  As another discharge means, as shown in FIG. 10, there is one in which a capacitor discharge switch 105 and a capacitor discharge control unit 106 are further provided in the capacitive circuit of FIG. This discharge means is configured to open and close the capacitor discharge switch 105 via the capacitor discharge control unit 106 under the control of the control unit 130, thereby turning off the main power supply of the apparatus and causing the control unit 130 to switch the switch 3. After opening, the electric charge stored in the auxiliary capacitor 2 is discharged by selecting either automatic discharge or manual discharge. Therefore, the mobile X-ray imaging apparatus provided with this discharging means does not cause a problem that the capacitor discharging resistor 104 constantly consumes the power of the battery 1 by opening the capacitor discharging switch 105. However, the mounting space for the capacitor discharge resistor 104, the capacitor discharge switch 105, and the capacitor discharge control unit 106 is necessary, and the component weight is also large, so that it is difficult to reduce the size and weight of the device. Furthermore, parts costs are also incurred.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a mobile X-ray imaging apparatus capable of discharging a capacitive circuit with a simple configuration.

  According to a first aspect of the present invention, there is provided a mobile X-ray imaging apparatus in which an X-ray tube for generating X-rays, an X-ray detector for detecting X-rays, and a battery are mounted on a movable carriage. A capacitive circuit to be charged, a switch disposed in a path between the battery and the capacitive circuit, and the X and X when the power is supplied from the battery and the capacitive circuit during X-ray imaging. A high voltage generation circuit that generates a high voltage to be applied to the tube, and a load that is connected in parallel with the high voltage generation circuit and that consumes power of the battery and the capacitive circuit when the apparatus is running or during X-ray imaging A load control circuit for controlling the load; and after the switch is opened to cut off power supply from the battery to the capacitive circuit, the high voltage generation circuit, and the load, via the load control circuit Before Load is driven, characterized in that it comprises a control unit for releasing the charge stored in the capacitive circuit.

  According to a second aspect of the present invention, in the first aspect of the present invention, the load is a travel motor for traveling the apparatus, and the load control circuit is a motor control circuit that controls the travel motor. It is.

  The invention according to claim 3 is the invention according to claim 2, further comprising: a brake mechanism for stopping traveling of the device; and a brake control unit for controlling the brake mechanism; After driving the brake via the brake control unit, the driving motor is driven via the motor control circuit.

  According to a fourth aspect of the present invention, in the second or third aspect of the present invention, the apparatus further comprises motor rotation detection means for detecting that the traveling motor has rotated, and the control unit includes the motor control circuit. If the motor rotation detecting means detects the rotation of the traveling motor while discharging the capacitive circuit by driving the traveling motor via the motor, the driving of the traveling motor is stopped. A command to be transmitted to the motor control circuit.

  The invention according to claim 5 is the invention according to claim 2 or 3, further comprising motor rotation detection means for detecting that the traveling motor has rotated, wherein the control unit is configured to provide the motor control circuit. When the motor rotation detecting means detects the rotation of the traveling motor while discharging the capacitive circuit by driving the traveling motor via the motor, the rotational direction of the traveling motor is changed. A command for inversion is transmitted to the motor control circuit.

  The invention described in claim 6 is the invention described in claim 2 or claim 3, further comprising an inclination detecting means for detecting the inclination of the apparatus, wherein the control unit is configured to detect the inclination detected by the inclination detecting means. Then, a command for driving the traveling motor in a direction in which the apparatus is inclined is transmitted to the motor control circuit.

  The invention according to claim 7 is the invention according to claim 1, wherein the load is a motor for rotating the anode of the X-ray tube, and the load control circuit controls the motor for rotating the anode. It is a motor control circuit.

  The invention according to claim 8 is the invention according to claim 1, wherein the load is a cathode filament of the X-ray tube, and the load control circuit is a heating control circuit for heating the filament. is there.

  According to the first to eighth aspects of the present invention, after the control unit opens the switch and cuts off the power supply from the battery to the capacitive circuit, the high voltage generation circuit, and the load, the load control circuit is Since the electric charge stored in the capacitive circuit is discharged by driving the load through the capacitive circuit, the capacitive circuit can be discharged with a simple configuration. According to the present invention, since discharging is performed using a load that receives power supplied from the capacitive circuit, it is not necessary to add a part for discharging and mount it on the carriage, thereby reducing the weight of the device. Is possible.

  According to the fourth and fifth aspects of the present invention, the motor rotation detecting means for detecting the rotation of the traveling motor is provided, and the control unit executes the discharging operation of the capacitive circuit using the traveling motor. In this case, since the command signal to the traveling motor is switched according to the detection signal of the motor rotation detecting means, it is possible to maintain the stationary state even when the device is disposed on the inclined surface.

  According to the sixth aspect of the present invention, since the inclination detecting means for detecting the inclination of the device is provided, when the device is arranged on the inclined surface, the discharge operation of the capacitive circuit using the traveling motor by the control unit. When the operation is performed, it is possible to maintain the stationary state of the apparatus by rotating the traveling motor in the direction of increasing the inclination.

1 is a schematic side view of a mobile X-ray imaging apparatus according to the present invention. 1 is a perspective view of a mobile X-ray imaging apparatus according to the present invention. 1 is a circuit diagram for explaining a main electrical configuration of a mobile X-ray imaging apparatus according to the present invention. It is a circuit diagram explaining the structure relevant to the discharge of the capacitive circuit of the mobile X-ray imaging apparatus which concerns on 1st Embodiment. 4 is a flowchart for explaining a discharging operation of a capacitive circuit by a control unit 30. It is a circuit diagram which shows the structure relevant to the discharge of the capacitive circuit of the mobile X-ray imaging apparatus which concerns on 2nd Embodiment. 4 is a flowchart for explaining a discharging operation of a capacitive circuit by a control unit 30. It is a circuit diagram which shows the structure relevant to the discharge of the capacitive circuit of the mobile X-ray imaging apparatus which concerns on 3rd Embodiment. It is a circuit diagram explaining the structure relevant to the discharge of the capacitive circuit in the conventional mobile X-ray imaging apparatus. It is a circuit diagram explaining the structure relevant to the discharge of the capacitive circuit in the conventional mobile X-ray imaging apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view of a mobile X-ray imaging apparatus according to the present invention, and FIG. 2 is a perspective view thereof.

  This mobile X-ray imaging apparatus is equipped with elements necessary for movement of the apparatus and X-ray imaging. This mobile X-ray imaging apparatus includes a support column 14 disposed on a carriage 15, an arm 13 disposed so as to be movable up and down with respect to the support column 14, and an X-ray disposed at the tip of the arm 13. A tube 11, a collimator 12 disposed below the X-ray tube 11, an X-ray detector 16 for detecting X-rays irradiated from the X-ray tube 11 and passing through the subject, and the X-ray And a storage portion 17 for storing the detector 16. The carriage 15 is a moving carriage in which a pair of left and right front wheels 21 that are direction changing wheels and a pair of left and right rear wheels 22 that are driving wheels are disposed, and the traveling direction is operated by an operation handle 19. The In addition, a bumper 24 is disposed in front of the carriage 15 to absorb an impact when it collides with an obstacle in the traveling direction.

  The arm 13 can move up and down between a fixed position, which is indicated by a solid line in FIG. 1, where the arm 13 is to be disposed when the carriage 15 is moved, and a photographing position that is raised from the fixed position. In a state where the arm 13 is in the fixed position, the lower surface of the arm 13 abuts on a fixed portion 18 called an arm catch. Further, the arm 13 rotates in the θ3 direction while rotating from the fixed position by rotating the column 14 as shown in FIG.

  The collimator 12 is provided with a handle 26 that is used when the X-ray tube 11 and the collimator 12 are moved together. As shown in FIG. 2, the X-ray tube 11 and the collimator 12 attached to the X-ray tube 11 include a θ1 direction centered on an axis that faces a direction orthogonal to the extending direction of the arm 13, and the arm 13. Is swingable in the θ2 direction centered on the axis facing the extending direction.

  Further, as shown in FIG. 2, the X-ray tube 11 and the collimator 12 are movable in the horizontal direction as the arm 13 expands and contracts in the A direction. Further, as shown in FIG. 2, the X-ray tube 11 and the collimator 12 are movable in the vertical direction when the arm 13 moves up and down in the Z direction with respect to the support column 14.

  Further, the mobile X-ray imaging apparatus includes an LCD touch panel 25 that functions as a display unit and an operation unit. On the LCD touch panel 25, an operation switch for selecting an imaging condition, an X-ray image, and the like are displayed.

  FIG. 3 is a circuit diagram for explaining the main electrical configuration of the mobile X-ray imaging apparatus according to the present invention.

  Inside the carriage 15 is a battery 1, an auxiliary capacitor 2 connected in parallel to the battery 1, and a power supply from the battery 1 and the auxiliary capacitor 2 to give a high voltage to the X-ray tube 11. High voltage generation circuit 10, load 60 connected in parallel to high voltage generation circuit 10, load control circuit 70 for controlling load 60, and control unit for controlling high voltage generation circuit 10 and load control circuit 70 30 is disposed. In FIG. 3, for convenience of explanation, a set of the load 60 and the load control circuit 70 is shown. However, the battery 1 includes an auxiliary that is the battery 1 and the capacitive circuit during the movement of the apparatus and X-ray imaging. A plurality of loads receiving power supplied from the capacitor 2 are connected. A switch 3 is disposed in a path for supplying power from the battery 1 to the high voltage generation circuit 10. When the switch 3 is closed under the control of the control unit 30, the X-ray tube 11 and the load 60 are provided. Is supplied with power.

  The switch 3 is disposed between the battery 1 and the auxiliary capacitor 2, and the auxiliary capacitor 2 is charged when the switch 3 is in a closed state. In addition, a capacitor charging suppression resistor 4 and a charging suppression resistor short-circuit switch 5 are disposed between the auxiliary capacitors 2. The charging suppression resistance short-circuit switch 5 is opened and closed under the control of the control unit 30.

  The high voltage generation circuit 10 is supplied with power from both the battery 1 and the auxiliary capacitor 2 at the time of X-ray imaging, thereby boosting the voltage under the control of the control unit 30 and applying the boosted voltage to the X-ray tube 11. . As a result, high-output X-rays are generated.

  In the present invention, as shown in FIG. 3, when the switch 3 is opened, the capacitor discharge resistor 104, the capacitor discharge switch 105, the capacitor discharge described with reference to FIGS. The discharge circuit of the auxiliary capacitor 2 such as the control unit 106 is not particularly provided, and the capacitive circuit is discharged under the control of the control unit 30 using the load 60 that receives the power supply from the battery 1. ing.

  FIG. 4 is a circuit diagram illustrating a configuration related to discharging of the capacitive circuit according to the first embodiment. In the first embodiment, the load used for discharging the auxiliary capacitor 2 after turning off the power of the apparatus and opening the switch 3 is the traveling motor 61, and the load is controlled by a command from the control unit 30. The load control circuit is a motor control circuit 71. 4, the same components as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, the traveling motor 61 and the motor control circuit 71 that drive the rear wheels 22 during traveling of the apparatus are configured as a load in parallel with the high voltage generation circuit 10 connected to the battery 1. The traveling motor 61 has a smaller current consumption than that of the high voltage generation circuit 10, so that it appears that power is supplied only from the battery 1. However, the traveling motor 61 is also supplied with electric power from the parallel power supply of the battery 1 and the auxiliary capacitor 2 when the power supply of the apparatus is ON, and consumes the electric power stored in the auxiliary capacitor 2.

  A brake mechanism 32 that stops the rotation of the motor is connected to the traveling motor 61. The operation of the brake is controlled by the control unit 30 via the brake control unit 33. The brake mechanism 32 is an electromagnetic brake using an electromagnet, but may be another type of brake mechanism that mechanically stops the rotation of the rear wheel 22.

  With such a circuit configuration, the discharge operation of the capacitive circuit when the apparatus is turned off and the switch 3 is opened will be described. FIG. 5 is a flowchart for explaining the discharging operation of the capacitive circuit by the control unit 30.

  When the control unit 30 opens the switch 3 that has been short-circuited, the power supply circuit is opened (step S1), and power supply from the battery 1 to the high voltage generation circuit 10 and the travel motor 61 is interrupted. The charge of the auxiliary capacitor 2 remains without being consumed. After opening the switch 3, the control unit 30 sends a brake command to the brake control unit 33 (step S <b> 2), and the brake control unit 33 activates the brake mechanism 32 to brake the travel motor 61. State.

  The control unit 30 waits for a time (for example, 500 milliseconds) that the traveling motor 61 is reliably braked, and then sends a rotation command for rotating the traveling motor 61 to the motor control circuit 71 (step S3). . At this time, the brake mechanism 32 is operating and the rotation of the traveling motor 61 is suppressed. Note that the motor rotation command sent from the control unit 30 is such that the traveling motor 61 cannot rotate when the brake is applied, so the rear wheel 22 does not actually move and the device moves. Never do. On the other hand, since the motor rotation command is sent from the control unit 30 to the motor control circuit 71, an operation for rotating the traveling motor 61 is performed, and the residual charge of the auxiliary capacitor 2 is consumed. . By performing the operation to rotate the traveling motor 61 until a certain time (for example, 30 seconds) elapses (step S4), the residual level of the auxiliary capacitor 2 falls below the specified value defined by the standard. Discharge until After a predetermined time has elapsed, the control unit 30 withdraws the motor rotation command to the motor control circuit 71 and the brake command to the brake control unit 33 (step S5). Thereby, the discharge of the capacitive circuit is completed.

  Thus, after the control unit 30 opens the switch 3 and shuts off the power supply from the battery 1 to the capacitive circuit (auxiliary capacitor 2), the high voltage generation circuit 10 and the load (traveling motor 61), Since the load is driven via the load control circuit (motor control circuit 71) to release the charge stored in the capacitive circuit, the capacitive circuit can be discharged with a simple configuration. Unlike the conventional discharging means shown in FIG. 9 and FIG. 10, it is not necessary to mount the capacitor discharging resistor 104, the capacitor discharging switch 105, and the capacitor discharging control unit 106, so that the component cost does not occur. Since no mounting space is required and the weight of the device does not increase due to component weight, the device can be reduced in size and weight.

  FIG. 6 is a circuit diagram showing a configuration related to discharging of the capacitive circuit of the mobile X-ray apparatus according to the second embodiment. FIG. 7 is a flowchart for explaining the discharging operation of the capacitive circuit by the control unit 30. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and detailed description is abbreviate | omitted.

  In the second embodiment, a rotation detection sensor 34 is disposed as a motor rotation detection unit that detects that the traveling motor 61 has rotated. The rotation detection sensor 34 is connected to the traveling motor 61, and when the rotation of the traveling motor 61 is detected, the detection signal is transmitted to the control unit 30.

  The rotation command for rotating the traveling motor 61 from the control unit 30 is such that the traveling motor 61 cannot rotate if the brake is applied. When placed on the surface, the resultant force of the rotational force of the traveling motor 61 and gravity exceeds the braking force, and the rear wheel 22 may actually start to move.

  In the second embodiment, the control unit 30 performs an opening operation to open the switch 3 (step S11), sends a command to apply a brake to the brake control unit 33 (step S12), and the brake control unit 33 After operating the brake mechanism 32 to apply a brake to the traveling motor 61, a rotation command for rotating the traveling motor 61 is sent to the motor control circuit 71 (step S13). After this, when the rotation detection sensor 34 detects that the traveling motor 61 has actually rotated (step S14), the control unit 30 issues a command to reverse the rotational direction of the traveling motor 61 instantaneously. The data is transmitted to the control circuit 71 (step S15). When a certain time has elapsed in this state (step S16), the control unit 30 withdraws the rotation command to the motor control circuit 71 and the brake command to the brake control unit 33 (step S17).

  In the second embodiment, for example, when the mobile X-ray imaging apparatus is placed on a downhill, the control unit 30 sends a forward command in step S13, and the rear wheel 22 moves and the apparatus starts to go downhill. Sometimes, by sending a reverse command in step S15, the falling force due to gravity is canceled by the rising force due to the rotation of the traveling motor 61, and the brake is effectively applied, so that the stationary state of the device can be maintained.

  In step S15, the control unit 30 instantly transmits a command to reverse the rotation direction of the traveling motor 61 to the motor control circuit 71. However, instead of the command to reverse the rotation direction, the traveling motor 61 A command for stopping the driving may be transmitted. When the braking force exceeds the lowering force due to gravity, the stationary state of the apparatus can be maintained by stopping the driving of the traveling motor 61.

  In the second embodiment, the rotation detection sensor 34 detects that the traveling motor 61 has actually rotated while the brake is applied. Inclination detection means for detecting the inclination of the device such as an inclination sensor. Thus, the inclination of the place where the mobile X-ray apparatus is placed may be detected. In this case, after the control unit 30 sends a brake command to the brake control unit 33, the motor rotation command (step S3 in FIG. 5) of the traveling motor 61 sent to the motor control circuit 71 is set to the inclination direction. A rotation command that rotates in the reverse direction may be used.

  FIG. 8 is a circuit diagram showing a configuration related to the discharge of the capacitive circuit of the mobile X-ray apparatus according to the third embodiment. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment and 2nd Embodiment, and detailed description is abbreviate | omitted.

  In the third embodiment, the load used for discharging the auxiliary capacitor 2 after the switch 3 is turned off and the switch 3 is opened is the anode rotation motor 62 of the X-ray tube 11. This shows a case where the load control circuit for controlling the load by the command is a motor control circuit 72 for controlling the anode rotation motor 62.

  When the X-ray tube 11 is a rotary anode X-ray tube, an anode rotation motor 62 that rotates the anode 64 is provided. The rotation of the anode 64 is controlled by a motor control circuit 72 connected in parallel to the high voltage generation circuit 10. The cathode filament 63 of the X-ray tube 11 is controlled by a heating control circuit 73 connected in parallel to the high voltage generation circuit 10. The motor control circuit 72 and the heating control circuit 73 are controlled by the control unit 30 and are supplied with power from the battery 1 and the auxiliary capacitor 2.

  In the third embodiment, when the control unit 30 opens the short-circuited switch 3, the control unit 30 transmits a rotation command for the anode rotation motor 62 to the motor control circuit 72 to rotate the anode. Thus, the auxiliary capacitor 2 is discharged.

  The load for discharging the auxiliary capacitor 2 when the power of the apparatus is turned off is the cathode filament 63 in the X-ray tube 11, and a load control circuit for controlling the load according to a command from the control unit 30 is used to heat the cathode filament 63. It is good also as the heating control circuit 73 which controls. In this case, when the control unit 30 opens the short-circuited switch 3, a heating command for the cathode filament 63 is transmitted from the control unit 30 to the heating control circuit 73, and a heating current is supplied to the cathode filament 63. As a result, the auxiliary capacitor 2 is discharged.

  Note that the load used for discharging the capacitive circuit is more directly related to the generation of X-rays such as the traveling motor 61 than the configuration related to the X-ray tube 11 in consideration of the consumption of the X-ray tube 11. It is preferable to employ a configuration that is not involved.

DESCRIPTION OF SYMBOLS 1 Battery 2 Auxiliary capacitor 3 Switch 4 Capacitor charge suppression resistor 5 Charge suppression resistance short circuit switch 10 High voltage generation circuit 11 X-ray tube 12 Collimator 13 Arm 14 Post 15 Cart 16 Flat panel detector 17 Storage part 18 Fixing part 19 Operation Handle 21 Front wheel 22 Rear wheel 24 Bumper 25 LCD touch panel 26 Handle 30 Control unit 32 Brake mechanism 33 Brake control unit 34 Rotation detection sensor 60 Load 61 Traveling motor 62 Anode rotation motor 63 Cathode filament 70 Load control circuit 71 Motor control circuit 72 Motor control circuit 73 Heating control circuit 104 Capacitor discharge resistor 105 Capacitor discharge switch 106 Capacitor discharge control unit 130 Control unit

Claims (8)

In a mobile X-ray imaging apparatus in which an X-ray tube that generates X-rays, an X-ray detector that detects X-rays, and a battery are mounted on a mobile carriage,
A capacitive circuit charged from the battery;
A switch disposed in a path between the battery and the capacitive circuit;
A high voltage generating circuit for generating a high voltage to be applied to the X-ray tube by supplying power from the battery and the capacitive circuit during X-ray imaging;
A load that is connected in parallel with the high-voltage generation circuit and consumes power of the battery and the capacitive circuit when the device is running or X-ray imaging;
A load control circuit for controlling the load;
After opening the switch and cutting off the power supply from the battery to the capacitive circuit, the high voltage generation circuit and the load, the load is driven via the load control circuit to the capacitive circuit. A control unit for discharging the stored charge;
A mobile X-ray imaging apparatus comprising: The mobile X-ray imaging apparatus according to claim 1,
The load is a traveling motor for traveling the device,
The mobile X-ray imaging apparatus, wherein the load control circuit is a motor control circuit that controls the traveling motor. The mobile X-ray imaging apparatus according to claim 2,
A brake mechanism for stopping the running of the device;
A brake control unit for controlling the brake mechanism,
The said control part is a mobile X-ray imaging apparatus which drives the said driving motor via the said motor control circuit, after operating the said brake mechanism via the said brake control part. The mobile X-ray imaging apparatus according to claim 2 or 3,
Motor rotation detecting means for detecting that the traveling motor has rotated,
When the control unit detects the rotation of the traveling motor while discharging the capacitive circuit by driving the traveling motor via the motor control circuit A mobile X-ray imaging apparatus that transmits a command to stop driving of the traveling motor to the motor control circuit. The mobile X-ray imaging apparatus according to claim 2 or 3,
Motor rotation detecting means for detecting that the traveling motor has rotated,
When the control unit detects the rotation of the traveling motor while discharging the capacitive circuit by driving the traveling motor via the motor control circuit A mobile X-ray imaging apparatus that transmits a command to reverse the rotation direction of the traveling motor to the motor control circuit. The mobile X-ray imaging apparatus according to claim 2 or 3,
Further comprising a tilt detecting means for detecting the tilt of the device;
The control unit is a mobile X-ray imaging apparatus that transmits, to the motor control circuit, a command for driving the traveling motor in a direction in which the apparatus moves up the inclination with respect to the inclination detected by the inclination detecting unit. The mobile X-ray imaging apparatus according to claim 1,
The load is a motor for rotating the anode of the X-ray tube;
The mobile X-ray imaging apparatus, wherein the load control circuit is a motor control circuit for controlling the anode rotating motor. The mobile X-ray imaging apparatus according to claim 1,
The load is a cathode filament of the X-ray tube;
The load control circuit is a mobile X-ray imaging apparatus which is a heating control circuit for heating the filament.

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