Abstract: An image forming apparatus includes: a light source; a brushless motor including a stator and a rotor; a rotary polygon mirror rotated by the brushless motor to form scanning lines on a photosensitive member; an energization switching unit turning on/off energizations of the coils; a voltage detecting unit outputting a detection signal based on induced voltages generated in coils of the stator by rotation of the rotor; a motor controlling unit turning on/off of the energizations by the energization switching unit based on the detection signal; an electric component that operates during formation of the scanning lines; and a power supply controlling unit which, in a detecting period of the detection signal for starting a rotation control of the brushless motor, reduces an amount of electric power supplied to the electric component to less than in a period of the formation of scanning lines after the detecting period.

Abstract: The humidity detecting device includes a detection unit and a controller. The detection unit includes a humidity sensor for producing a humidity detection signal by detecting a humidity, a temperature sensor for producing a temperature detection signal by detecting a temperature surrounding the humidity sensor, and a common power supply line connected to the humidity sensor and the temperature sensor. The controller includes an application circuit for applying a power supply voltage to the humidity sensor and the temperature sensor through the common power supply line, a read circuit for producing a read-out humidity value corresponding to the humidity detection signal and a read-out temperature value corresponding to the temperature detection signal, and a correction circuit for correcting the read-out humidity value based on the read-out temperature value.

Abstract: An image forming apparatus includes: a light source that emits a light beam; a photosensitive member; a driving motor; a rotary polygon mirror, which is rotated by the driving motor, and which periodically deflects the light beam emitted from the light source to sequentially form scanning lines on the photosensitive member; a position detecting unit, which detects a rotational position of the driving motor, and which outputs a detection signal; a sensor, which receives the light beam deflected by the rotary polygon mirror, and which outputs a light receiving signal; a detecting unit, which receives the detection signal and the light receiving signal, and which detects a rotation direction of the driving motor based on a timing pattern of a detection of the rotational position of the driving motor and a reception of the light beam by the sensor.

Abstract: An image forming apparatus includes: a light source that emits a light beam; a photosensitive member; a brushless motor including a stator where a plurality of coils are placed and a rotor where a plurality of magnets are placed; a rotary polygon mirror, which is rotated by the brushless motor, and which periodically deflects the light beam emitted from the light source to sequentially form scanning lines on the photosensitive member; an energization switching unit that turns on and off energizations of the coils; a voltage detecting unit that outputs a detection signal based on induced voltages that are generated in the coils by rotation of the rotor; and a control unit that controls turning on/off of the energizations by the energization switching unit based on the detection signal.

Abstract: An image forming apparatus includes: a light source; a light-source driving unit; a photosensitive member including an image forming region; a determining unit determining a level of a rotation speed of the photosensitive member; a scanner unit exposing the photosensitive member by deflecting the light beam from the light source by a deflecting unit; a sensor receiving the light beam and outputs a detection signal; and a control unit controlling the image forming apparatus based on the detection signal output from the sensor. When the determining unit determines that the rotation speed is low, the light-source driving unit is configured to drive the light source to emit the light beam when a deflecting direction of the light beam is oriented toward the sensor and not to drive the light source to emit the light beam when the deflecting direction of the light beam is oriented toward the image forming region.

Abstract: An optical control device includes a semiconductor laser that generates a light according to a drive current, a light amount detecting unit that detects a light amount of the light generated by the semiconductor laser; and a controller that controls the drive current to adjust the light amount to a target value by referring to a referring number of detection results of the light amount by the light amount detecting unit. The referring number at a time when the controller starts the drive current flowing is smaller than the referring number after the detection result of the light amount reaches a predetermined value.

Abstract: A humidity detecting device includes a humidity sensor, which detects humidity using a change in an impedance by humidity, and which generates a humidity detection signal according to application of an AC voltage, a detecting unit that detects the impedance of the humidity sensor based on the humidity detection signal, a switching unit that switches a frequency of the AC voltage to at least a first frequency and a second frequency, the humidity sensor being a first impedance at the first frequency and a second impedance at the second frequency, a temperature sensor that detects ambient temperature of the humidity sensor, a calculating unit that calculates a difference and/or a change rate between the first impedance and the second impedance, a discriminating unit that discriminates the humidity sensor based on the difference and/or the change rate, and a control unit that performs processing corresponding to the discriminated humidity sensor.

Abstract: This invention provides an image forming apparatus. The image forming apparatus includes: a carrier, a power unit, a switch, and a controller. The carrier is configured to carry a recording medium. The power unit is configured to provide a drive power to the carrier. The switch is configured to switch an operation state of the carrier between an ON state and an Off state of a transmission of the drive power from the power unit to the carrier. The controller is configured to provide a control power to control the switch such that the control power is reduced after a switching from the Off state to the ON state.

Abstract: The humidity detecting device includes a detection unit and a controller. The detection unit includes a humidity sensor for producing a humidity detection signal by detecting a humidity, a temperature sensor for producing a temperature detection signal by detecting a temperature surrounding the humidity sensor, and a common power supply line connected to the humidity sensor and the temperature sensor. The controller includes an application circuit for applying a power supply voltage to the humidity sensor and the temperature sensor through the common power supply line, a read circuit for producing a read-out humidity value corresponding to the humidity detection signal and a read-out temperature value corresponding to the temperature detection signal, and a correction circuit for correcting the read-out humidity value based on the read-out temperature value.

Abstract: In an optical control apparatus, a semiconductor laser emits a laser beam having a power corresponding to an energizing current. A light power detecting device detects a light power of the laser beam. A monitor voltage generating device generates a monitor voltage set based on the light power. A reference voltage generating device generates a reference voltage set based on a target light power of the laser beam. A current control device controls the energizing current such that the monitor voltage approaches the reference voltage based on a deviation of the monitor voltage from the reference voltage. A pseudo voltage input device inputs a predetermined pseudo voltage to the current control device instead of the monitor voltage under a predetermined condition such that a variation range of the deviation lies within a predetermined range.

Abstract: One aspect of the present invention can include a laser light output control apparatus having a plurality of laser light output control systems including a laser light source capable of receiving supplying of current via a power supplying path from a power source and irradiating laser light, a photo-detecting device capable of receiving the light irradiated from the laser light source and outputting a monitor current dependent on the amount of light received, a conversion circuit capable of converting the monitor current into a voltage value, a control circuit capable of controlling the current supplied to the laser light source based on the voltage value outputted from the conversion circuit so that the intensity of laser light irradiated from the laser light source changes to a predetermined value, the respective conversion circuits of each said output control system have a fixed resistor and a variable resistor connected in series to each other, and at least one of the fixed resistors of each said pluralit

Abstract: An image forming apparatus is provided. The image forming apparatus includes a light emitter which emits light; a drive section which drives the light emitter according to a control signal; a light amount detection section which detects an amount of light which is emitted from the light emitter; an analog to digital converter which converts the amount of light into a digital value; a feedback controller which controls the control signal based on the digital value and a reference value, and outputs the control signal to the drive section; and a setting change section which sets a change unit used by the feedback controller to control the control signal.

Abstract: One aspect of the present invention can include a laser light output control apparatus having a plurality of laser light output control systems including a laser light source capable of receiving supplying of current via a power supplying path from a power source and irradiating laser light, a photo-detecting device capable of receiving the light irradiated from the laser light source and outputting a monitor current dependent on the amount of light received, a conversion circuit capable of converting the monitor current into a voltage value, a control circuit capable of controlling the current supplied to the laser light source based on the voltage value outputted from the conversion circuit so that the intensity of laser light irradiated from the laser light source changes to a predetermined value, the respective conversion circuits of each said output control system have a fixed resistor and a variable resistor connected in series to each other, and at least one of the fixed resistors of each said pluralit

Abstract: An optical control device includes a semiconductor laser that generates a light according to a drive current, a light amount detecting unit that detects a light amount of the light generated by the semiconductor laser; and a controller that controls the drive current to adjust the light amount to a target value by referring to a referring number of detection results of the light amount by the light amount detecting unit. The referring number at a time when the controller starts the drive current flowing is smaller than the referring number after the detection result of the light amount reaches a predetermined value.

Abstract: An image forming apparatus includes an exposure unit, a developing unit and a transferring unit that transfers a visualized image of developer to an image recording medium. The exposure unit includes a light emitting unit, a detecting unit that detects a quantity of light, a reference voltage generating portion that generates a reference voltage set in accordance with a targeted value of the quantity of light, an emitted-light quantity control circuit that controls the quantity of light emitted from the light emitting unit so that a detection voltage becomes equal to a value of the reference voltage, and a reference voltage control portion that controls the reference voltage generating portion so as to change the reference voltage at a predetermined rate in stages. A new reference voltage is based on a density of the image of the developer obtained after being changed when the density is changed.

Abstract: A laser printer capable of controlling the operation of a fixing heater to heat a roller, including an energizing circuit for energizing a heater, a temperature detecting circuit such as thermistors, a noise canceling circuit, and a control circuit for controlling the energizing circuit and the heater. After receiving a voltage indicating an abnormal temperature of the heater over a prescribed length of time duration, the noise canceling circuit is configured to transmit a LOW level voltage to a latch circuit as an abnormality signal. The control circuit suspends the energization of the heater in response to the abnormality signal.

Abstract: In an optical control apparatus, a semiconductor laser emits a laser beam having a power corresponding to an energizing current. A light power detecting device detects a light power of the laser beam. A monitor voltage generating device generates a monitor voltage set based on the light power. A reference voltage generating device generates a reference voltage set based on a target light power of the laser beam. A current control device controls the energizing current such that the monitor voltage approaches the reference voltage based on a deviation of the monitor voltage from the reference voltage. A pseudo voltage input device inputs a predetermined pseudo voltage to the current control device instead of the monitor voltage under a predetermined condition such that a variation range of the deviation lies within a predetermined range.

Abstract: A manganese dry battery with excellent leak-proof property is provided, in which electrolyte leakage does not occur even if the size of a positive electrode material mixture is increased to meet a demand for improvement in discharge property. In a sealing part, a first circular projection, a second circular projection and a third circular projection are arranged at the bottom in sequence from the center to the outside, and a positive electrode carbon rod supporting part is provided in an innermost periphery portion to have an interval from the first circular projection. A groove between the first projection and the carbon rod is formed to have a substantially rectangular vertical section, kraft board is pressed by flat bottom surfaces of the first and second projections and an opening of the zinc can is fitted between the second and third projections.

Abstract: An electronic apparatus includes: an electronic part attachment member including a plurality of electronic parts; and an electric connection unit provided on the electronic part attachment member, the electric connection unit including: a first power source terminal that supplies a drive power source to the electronic parts; and a plurality of signal terminals through which an electric signal input into the electronic parts flows, wherein: the first power source terminal and the plurality of signal terminals are arranged in an substantially straight line; the first power source terminal is disposed in a longitudinal direction approximate center of the electric connection unit; and the signal terminals are disposed on at least one side in a longitudinal direction of the electric connection unit with respect to the first power source terminal.

Abstract: An image forming apparatus includes an exposure unit, a developing unit and a transferring unit that transfers a visualized image of developer to an image recording medium. The exposure unit includes a light emitting unit, a detecting unit that detects a quantity of light, a reference voltage generating portion that generates a reference voltage set in accordance with a targeted value of the quantity of light, an emitted-light quantity control circuit that controls the quantity of light emitted from the light emitting unit so that a detection voltage becomes equal to a value of the reference voltage, and a reference voltage control portion that controls the reference voltage generating portion so as to change the reference voltage at a predetermined rate in stages. Anew reference voltage is based on a density of the image of the developer obtained after being changed when the density is changed.