Abstract: An FPD is provided with an ammeter for measuring current on a wired connection of a bias line that applies a bias voltage to pixels. A control circuit compares the measured value of the ammeter and a threshold value. When the measured value of the ammeter is equal to or larger than the threshold value, the control circuit judges that an emission of X-rays from an X-ray source is started. Until before the start of the X-ray irradiation is detected, the control circuit stops supplying electric power to a signal processing circuit, and turns on all TFTs. Once the start of the X-ray irradiation is detected, the control circuit turns off all the TFTs, and makes the FPD shift to a charge accumulation operation. Thereafter, the control circuit turns on a processing power source to start supplying the electric power to the signal processing circuit.

Abstract: An FPD is provided with an ammeter for measuring current on a wired connection of a bias line that applies a bias voltage to pixels. A control circuit compares the measured value of the ammeter and a threshold value. When the measured value of the ammeter is equal to or larger than the threshold value, the control circuit judges that an emission of X-rays from an X-ray source is started. Until before the start of the X-ray irradiation is detected, the control circuit stops supplying electric power to a signal processing circuit, and turns on all TFTs. Once the start of the X-ray irradiation is detected, the control circuit turns off all the TFTs, and makes the FPD shift to a charge accumulation operation. Thereafter, the control circuit turns on a processing power source to start supplying the electric power to the signal processing circuit.

Abstract: An FPD is provided with an ammeter for measuring current on a wired connection of a bias line that applies a bias voltage to pixels. A control circuit compares the measured value of the ammeter and a threshold value. When the measured value of the ammeter is equal to or larger than the threshold value, the control circuit judges that an emission of X-rays from an X-ray source is started. Until before the start of the X-ray irradiation is detected, the control circuit stops supplying electric power to a signal processing circuit, and turns on all TFTs. Once the start of the X-ray irradiation is detected, the control circuit turns off all the TFTs, and makes the FPD shift to a charge accumulation operation. Thereafter, the control circuit turns on a processing power source to start supplying the electric power to the signal processing circuit.

Abstract: In a radiography system, after a radiation dose, signal charges are accumulated in sensor pixels in an imaging area of a flat panel detector corresponding to the dosed amounts of radioactive rays on the pixels. The signal charges are read out from the pixels and converted into voltage signals representative of density levels of respective pixels of a radiographic image. Before reading the signal charges, a dose profile representative of distribution of the dosed amounts of radioactive rays is measured by leak currents from the pixels or bias currents through bias lines for applying a bias voltage to the pixels. Based on the contrast or difference between the maximum value and the minimum value in the dose profile, a gain of amplifiers for the voltage signals is determined such that the gain increases with decreasing contrast.

Abstract: A FPD includes a signal processing circuit and noise detecting elements provided for each group containing plural columns of pixels. The signal processing circuit converts signal charges accumulated in the pixels into electric signals and outputs the electric signals. Each of the noise detecting elements has the same structure as that of the pixel, but does not have a function of accumulating the electric charges. A voltage signal of the noise detecting element represents noise components. A subtractor subtracts the voltage signal of the noise detecting elements from a voltage signal of the pixels which is outputted from the noise processing circuit.

Abstract: There is provided a radiographic imaging device including: a radiation detector; a switching power supply; a storage section; a reading section; and a control section that controls the switching power supply so as to implement switching control and cause electricity to be accumulated in the storage section at a time when charge is not being read by the reading section, and stop switching control at a time when charge is being read by the reading section.

Abstract: A radiographic image capturing apparatus includes a radiation conversion panel for converting radiation into radiographic images, an A/D converter for performing an A/D conversion process on image signals depending on the radiographic image output from the radiation conversion panel, and a number-of-sampling determiner for determining a number of times of sampling for the A/D conversion process performed by the A/D converter, based on the dose of radiation, which is applied to the radiation conversion panel.

Abstract: In a radiography system, after a radiation dose, signal charges are accumulated in sensor pixels in an imaging area of a flat panel detector corresponding to the dosed amounts of radioactive rays on the pixels. The signal charges are read out from the pixels and converted into voltage signals representative of density levels of respective pixels of a radiographic image. Before reading the signal charges, a dose profile representative of distribution of the dosed amounts of radioactive rays is measured by leak currents from the pixels or bias currents through bias lines for applying a bias voltage to the pixels. Based on the contrast or difference between the maximum value and the minimum value in the dose profile, a gain of amplifiers for the voltage signals is determined such that the gain increases with decreasing contrast.

Abstract: An FPD is provided with an ammeter for measuring current on a wired connection of a bias line that applies a bias voltage to pixels. A control circuit compares the measured value of the ammeter and a threshold value. When the measured value of the ammeter is equal to or larger than the threshold value, the control circuit judges that an emission of X-rays from an X-ray source is started. Until before the start of the X-ray irradiation is detected, the control circuit stops supplying electric power to a signal processing circuit, and turns on all TFTs. Once the start of the X-ray irradiation is detected, the control circuit turns off all the TFTs, and makes the FPD shift to a charge accumulation operation. Thereafter, the control circuit turns on a processing power source to start supplying the electric power to the signal processing circuit.

Abstract: A FPD includes a signal processing circuit and noise detecting elements provided for each group containing plural columns of pixels. The signal processing circuit converts signal charges accumulated in the pixels into electric signals and outputs the electric signals. Each of the noise detecting elements has the same structure as that of the pixel, but does not have a function of accumulating the electric charges. A voltage signal of the noise detecting element represents noise components. A subtractor subtracts the voltage signal of the noise detecting elements from a voltage signal of the pixels which is outputted from the noise processing circuit.

Abstract: A portable radiographic imaging device includes an operation unit, a controller, and an execution unit. The operation unit is operated when a target function is selected from plural different functions relating to radiographic image capturing. When a first condition, that expresses that a predetermined region has been placed at a predetermined placement portion, is established, the controller carries out control such that a function that should be effective when the first condition is established is selected. When a second condition, that expresses that the predetermined region is not placed at the placement portion, is established, the controller carries out control such that a function that should be effective when the second condition is established is selected. When the operation unit is operated, the execution unit executes a function that is controlled by the controller to be selected.

Abstract: A detection signal processor that includes a signal processing unit, bias current supply components, and a bias current control component is provided. The signal processing unit applies a first signal processing in parallel to plural detection signals input in parallel, converts the plural detection signals to serial detection signals by applying a parallel-to-serial conversion processing to the plural detection signals, and applies a second signal processing to the converted serial detection signals in turn. The bias current control component switches amount of the bias currents supplied to the each circuit configuring the signal processing unit by the bias current supply components, the bias currents including first bias currents supplied to the first circuits carrying out the first signal processing and second bias currents supplied to the second circuits carrying out the parallel-to-serial conversion processing and the second signal processing in turn.

Abstract: There is provided a radiographic imaging device including: a radiation detector; a switching power supply; a storage section; a reading section; and a control section that controls the switching power supply so as to implement switching control and cause electricity to be accumulated in the storage section at a time when charge is not being read by the reading section, and stop switching control at a time when charge is being read by the reading section.

Abstract: A portable radiographic imaging device includes an operation unit, a controller, and an execution unit. The operation unit is operated when a target function is selected from plural different functions relating to radiographic image capturing. When a first condition, that expresses that a predetermined region has been placed at a predetermined placement portion, is established, the controller carries out control such that a function that should be effective when the first condition is established is selected. When a second condition, that expresses that the predetermined region is not placed at the placement portion, is established, the controller carries out control such that a function that should be effective when the second condition is established is selected. When the operation unit is operated, the execution unit executes a function that is controlled by the controller to be selected.

Abstract: A detection signal processor that includes a signal processing unit, bias current supply components, and a bias current control component is provided. The signal processing unit applies a first signal processing in parallel to plural detection signals input in parallel, converts the plural detection signals to serial detection signals by applying a parallel-to-serial conversion processing to the plural detection signals, and applies a second signal processing to the converted serial detection signals in turn. The bias current control component switches amount of the bias currents supplied to the each circuit configuring the signal processing unit by the bias current supply components, the bias currents including first bias currents supplied to the first circuits carrying out the first signal processing and second bias currents supplied to the second circuits carrying out the parallel-to-serial conversion processing and the second signal processing in turn.

Abstract: A semiconductor laser driving circuit for driving a semiconductor laser as an exposure light source is used in an image recording apparatus for recording an image using a light beam from the laser. The light beam emitted from the laser is subjected to pulse modulation in correspondence with a command signal. The circuit includes an error amplifier for amplifying a difference between the command signal and a signal fed back from the laser to output an output signal, a diode and a resistor connected in series between an input terminal and an output terminal of the error amplifier and a driver for driving the laser based on the output signal.

Abstract: A first f? lens is arranged to form an inclination angle ?1 to a main scanning plane. A second f? lens is arranged to form an inclination angle ?2. In order to determine the inclination angles ?1 and ?2, curvature amounts of scanning lines generated on a scanned surface are measured when the f? lenses are independently inclined one at a time at a minute angle. Change rates K1 and K2 are obtained from the measured curvature amounts and the minute angles. The inclination angles ?1 and ?2 are determined such that |K1?1+K2?2| is no more than a certain value.

Abstract: A semiconductor laser driving circuit for driving a semiconductor laser as an exposure light source is used in an image recording apparatus for recording an image using a light beam from the laser. The light beam emitted from the laser is subjected to pulse modulation in correspondence with a command signal. The circuit includes an error amplifier for amplifying a difference between the command signal and a signal fed back from the laser to output an output signal, a diode and a resistor connected in series between an input terminal and an output terminal of the error amplifier and a driver for driving the laser based on the output signal.

Abstract: In a semiconductor laser device, when a light beam is emitted from a semiconductor laser element in a state in which temperatures of the semiconductor laser element and a light detecting element are adjusted, effects of temperature characteristics of the semiconductor laser element and the light detecting element can be avoided, and a wavelength of the laser beam is stable. An amount of light of the light beam is detected at the light detecting element. On the basis of results of detection, the light amount of the light beam emitted from the semiconductor laser element is accurately controlled (APC).

Abstract: There is provided a dustproof structure of an optical box in which intrusion of dust into the optical box can be prevented. Laser beams deflected by a polygon mirror of an optical box are transmitted through an optical system and exit from an opening outside the optical box, and reach a photographic printing paper. In this case, when dust and the like adhere to the polygon mirror or the optical box, the function of such an optical element deteriorates. Therefore, a dustproofing effect is required by the optical box. Accordingly, by supplying air into the optical box using a fan to thereby pressurize an interior of the optical box, the intrusion of dust from outside of the optical box into the optical box can be prevented, thereby making it possible to prevent dust or the like from adhering to the polygon mirror or the optical system.