Abstract:
An optical print head includes: light-emitting elements in line shape; first power line supplying first reference voltage; second power line supplying drive current to each light-emitting element and supplying second reference voltage; DAC outputting first voltage indicating light emission amount of each light-emitting element; first elements for holding first voltage difference between the first reference voltage and the first voltage; second elements each electrically connectable with corresponding first element and for holding second voltage difference between the second reference voltage and second voltage according to the first voltage, and during supply of drive current, controls each first element to hold the first difference by electrically disconnecting the first and second elements, and temporarily suspends supply of the drive current, and controls the second element to hold the second difference by electrically connecting the first and second elements, such that the drive current according to the second voltage difference is supplied.
Abstract:
An optical print head for forming an electrostatic latent image on a photosensitive body, including: current-driven light-emitting elements disposed in a line shape; an indicator circuit that outputs indicator current indicating light emission amounts to the light-emitting elements; and for each light-emitting element: a holding circuit that, during a main scanning period, accumulates indicator current during a sample period to generate an indicator potential and holds the indicator potential during a hold period; and a drive circuit that supplies drive current to the light-emitting element according to the indicator potential, wherein each of the sample periods is divided into writing periods, and each of the holding circuits holds the indicator potential corresponding to the holding circuit according to a total of indicator current amounts in the sample period corresponding to the holding circuit, the indicator current amounts each indicative of indicator current during one of the writing periods.
Abstract:
A photometric apparatus includes: a dimming member disposed so as to be insertable in and removable from a light path of light to be measured from a display; and a hardware processor that acquires a photometric value of the light to be measured in a state in which the dimming member is inserted in the light path and a photometric value of the light to be measured in a state in which the dimming member is not inserted in the light path in order to generate a calibration coefficient for suppressing a measurement error between the state in which the dimming member is inserted in the light path and the state in which the dimming member is not inserted in the light path.
Abstract:
A communication system includes a cloud server, a management server, a gateway-enabled device, and a printing apparatus, and these are connected to each other. The gateway-enabled device includes a mode switch that wakes up the device from power saving mode when a HTTP tunneling request is received from the cloud server via a second requesting portion of the management server, a tunneling portion that accesses the cloud server by HTTP tunneling if the request is received via a first requesting portion of the management server during normal operation mode or that does the same after back to normal operation mode if the request is received via the second requesting portion by a method allowing waking up from power saving mode, a receiver that receives a print job from the cloud server having being accessed by HTTP tunneling, and a transfer portion that transfers the print job to the printing apparatus.
Abstract:
An optical measuring device includes: a stimulus value acquirer that receives light from a measurement target and continuously acquires intensity corresponding to a stimulus value at a regular time interval; a response characteristic acquirer that acquires an impulse response characteristic from a storage that stores the impulse response characteristic corresponding to a luminous stimulus response; and a hardware processor that performs digital filter processing on continuous data of stimulus value intensity acquired by the stimulus value acquirer by the impulse response characteristic acquired by the response characteristic acquirer to generate data on which the luminous stimulus response is superimposed.
Abstract:
Provided with: a detecting means to detect a possible light intensity changing frequency of a measuring object; a frequency determining means to determine a light intensity changing frequency with reference to the possible light intensity changing frequency; a resolution determining means to determine a frequency resolution for flicker measuring with reference to the determined light intensity changing frequency; and a flicker measuring means to conduct flicker measuring with the determined frequency resolution. The resolution determining means determines the frequency resolution to be an integral submultiple of the light intensity changing frequency determined by the frequency determining means.
Abstract:
A cloud server acquires a stop period indicating a period during which a management server refrains from providing services; transmits connection requests to said management server if not in the stop period; establishes first communication session when establishment requests including the same address information as address information of connection destination included in the connection request are received from a relay device receiving connection requests forwarded from the management server after transmission of connection requests; transmits jobs to a control target device via first communication session; after first communication session is established, in response to acquisition of result of jobs executed by the control target device, if in the stop period, disconnects first communication session after the stop period finished; and if jobs are generated in the stop period, transmits to the control target device jobs generated in the stop period, via first communication session established before the stop period starts.
Abstract:
An optical writing device includes a plurality of current driven light emitting elements, first and second power source lines, a designation circuit that outputs a designation potential, first driving circuits provided for each of the light emitting elements to supply driving current to the corresponding light emitting element, second driving circuits provided for each of the light emitting elements to supply driving current to the corresponding light emitting element, and a switching control unit that alternately switches respective states of the first and second driving circuits between a state where one of the first and second driving circuits receives the designation potential while the other driving circuit supplies the driving current, and a state where the other driving circuit receives the designation potential while the one driving circuit supplies the driving current.
Abstract:
An optical writing device having; a plurality of light-emitting points; a plurality of drive circuits for supplying drive currents to the plurality of light-emitting points respectively; a photodetector for outputting signals indicating quantities of light entering thereto from the respective light-emitting points; a gain switch circuit for outputting photodetection signals obtained by amplifying the signals output from the photodetector in regard to the respective light-emitting points with gains preset for the respective light-emitting points; and a control circuit for controlling the drive circuits such that the photodetection signals output from the gain switch circuit in regard to the respective light-emitting points coincide with a value substantially equal to a predetermined reference value. The gains for the respective light-emitting points are preset based on the distances between the photodetector and the respective light-emitting points.
Abstract:
The photometric apparatus includes a light receiver having one or a plurality of light receiving sensors that receive light to be measured from an object to be measured; a controller that calculates a measured value based on an output from the one or plurality of light receiving sensors; a light attenuation member that is disposed so as to be insertable in and removable from a light path of the light to be measured and attenuates the light to be incident on the light receiver; and a corrector that corrects a difference between a measured value calculated by the controller in a state in which the light attenuation member is inserted in the light path and a measured value calculated by the controller in a state in which the light attenuation member is not inserted in the light path, the measured values varying depending on a characteristic of the object.