Ricoh Company, Ltd.

Tomohiro Sasa

Kenji Morita

Nobuyuki Satoh

Daisaku Horikawa

Yuichi Sakurada

Masaya Kawarada

Hiroki Shirado

Masamoto Nakazawa

Tadaaki Oyama

Tatsuya Ozaki

Kohsuke Nambara

Mamoru Yorimoto

Suguru Yokozawa

Hajime Tsukahara

Masayuki Fujii

Hiroshi Matsumoto

Masato Kobayashi

Hideki Hashimoto

Masahiro Hiranuma

A data processing device comprises: a data receiver to receive data to be processed, an external clock, and a unit control signal determining a processing unit for the data to be processed from an outside, the data receiver including a PLL circuit to receive the external clock; a clock abnormality detector to operate based on a clock of a system different from a system of the external clock and detect abnormality of the external clock based on a lock signal output from the PLL circuit; and a data processing controller to control processing of the data. When abnormality of the external clock is detected, the data processing controller stops taking in the data to be processed, and when the external clock becomes normal again, take in the unit control signal and resume taking in the data to be processed.

Data processing device, image reading apparatus, image forming apparatus, and method for processing data

A data processing device includes a data processing circuit and a data processing control circuit. The data processing circuit is configured to perform data processing on processing target data by use of an external clock, the processing target data being included in a data signal received from an outside, the external clock being included in the data signal. The data processing control circuit is configured to detect a state of the external clock and control execution of the data processing on the processing target data in accordance with the state of the external clock. The data processing control circuit is configured to operate with a clock having a lower impedance than an impedance of the external clock, and discard the processing target data received during a period in which an abnormality of the external clock is detected, in a case of detecting the abnormality of the external clock.

Data processing device, image reading apparatus, image forming apparatus, and data processing method

A document size detection device includes: a light source that irradiates a document placed on placing means with scanning light via the placing means; a reading unit that receives reflection light from the document via the placing means to acquire image data of the document; and circuitry to set an illumination depth of the scanning light at a size detection time when the size is detected, shallower than an illumination depth of the scanning light at an image reading time when an image of the document is read, and detects, at the size detection time, the size based on a difference between first image data acquired in a state in which the scanning light is switched off and second image data acquired in a state in which the scanning light is switched on.

Document size detection device, image reading device, image forming apparatus, document size detecting method, and recording medium

A reading device includes: a light source that irradiates a subject with scanning light; a light receiving section that receives reflection light from the subject; and circuitry to: control the light source to switch on and off of the scanning light; control the light receiver to receive the reflection light from the subject for a predetermined acquisition time at a predetermined acquisition interval so as to acquire data; and calculate a difference between the data acquired while the scanning light is switched on and the data acquired while the scanning light is switched off. The predetermined acquisition time and the predetermined acquisition interval are set such that the acquisition time or a total time of the acquisition time and the acquisition interval become an integer multiple of a fluctuation cycle of a fluctuation factor.

Reading device, image forming apparatus, and image reading method

A document size detection device includes: a light source to irradiate a document with light; an imaging device to receive light reflected at the document; and circuitry to control switch on and off of the light source and movement in a sub-scanning direction of the light source, and determine a size of the document based on image data acquired by the imaging device. The circuitry is to determine a size in a main-scanning direction of the document based on: first image data acquired when the light source is switched off while the light source is at a first reading position; second image data acquired when the light source is switched on while the light source is at the first reading position; and third image data acquired when the light source is switched on while the light source is being moved from the first reading position to a second reading position.

Document size detection device, image reading device, image forming apparatus, and document size detecting method

A signal processing device includes a signal output circuit, a controller, and a corrector. The signal output circuit outputs a signal according to a physical quantity being input. The controller controls the signal output circuit. The corrector corrects a signal to be corrected. The signal to be corrected is output from the signal output circuit. The signal output circuit selectively performs one of first operation of outputting a characteristic signal that indicates characteristics of the signal output circuit and second operation of outputting a pseudo signal that is generated spuriously, according to control of the controller. The corrector corrects the signal to be corrected based on one of the characteristic signal and the pseudo signal output from the signal output circuit.

Signal processing device, image scanning device, image forming apparatus, and method of controlling the same

An image capturing apparatus includes: a casing having an opening; a light source arranged inside the casing; a sensor arranged inside the casing and configured to capture, through the opening, an image of an object present outside the casing while the light source is on; and a distance calculator to calculate a distance between the casing and the object, based on an image that has been captured by the sensor and contains, within an image region of the object defined by the opening, a high-luminance region and low-luminance regions located more outside than the high-luminance region.

Image capturing apparatus, image forming apparatus, distance measuring method, and computer-readable recording medium

A distance measuring device includes: an imaging unit that captures a test pattern image including a pair of first markers and a second marker that is formed under a condition different from a condition applied to the first markers; a position detecting unit that detects a position of each of the pair of first markers and the second marker in a captured image captured by the imaging unit; a ratio calculating unit that calculates a ratio of a distance between the pair of the first markers in the captured image and an actual distance between the pair of the first markers; and an actual distance calculating unit that calculates an actual distance between one of the first markers as the pair and the second marker by multiplying a distance between the one of the first markers as the pair and the second marker in the captured image by the ratio.

Distance measuring device, image forming apparatus, and distance measuring method

An image forming apparatus includes a recording head to discharge ink to a recording medium to form an image thereon, an optical sensor to output a signal in response to intensity of reflection of light emitted to the direction of discharging the ink, a carriage that carries the recording head and the optical sensor, and a control unit to detect the position of the recording medium based on the signal output by the optical sensor and control the recording head to discharge the ink only onto the position of the recording medium, wherein the control unit acquires a value according to the signal output by the optical sensor in response to the movement of the carriage and detects the position of the recording medium when a predetermined relation between the value and a threshold continues at least for a predetermined interval in the movement of the carriage.

Image forming apparatus, control method of image forming apparatus, and non-transitory recording medium

A nozzle testing device includes: a two-dimensional image sensor to capture an image of a pattern formed on a recording object by discharging ink from a nozzle row while moving the nozzle row and the recording object relative to each other in a direction orthogonal to the nozzle row; a light source unit provided such that regularly reflected light by the pattern forms a regular reflection area in the image of the pattern captured by the two-dimensional image sensor; and a detection unit to analyze the image to detect discharge failure of the nozzles. The regular reflection area is formed in the image such that a dimension in a direction corresponding to the direction of relative movement between the nozzle row and the recording object is greater than a dimension in a direction orthogonal to the direction corresponding to the direction of relative movement in the image.

Nozzle testing device and image forming apparatus

An image forming apparatus includes a printing unit that prints at least one object image using a color material; a color information acquiring unit that acquires color information of the object image; and a control unit that starts one of colorimetry of the object image using the color information acquired by the color information acquiring unit and color adjustment of the printing unit after a variation amount of color information of the object image measured at different points of time is equal to or smaller than a predetermined threshold.

Image forming apparatus, calibration method, and drying determination method

An image forming apparatus includes a detection unit that emits light on a recording medium or a platen and detects reflected light while the detection unit moves in a direction perpendicular to a transportation direction of the recording medium; a width calculation unit that compares a value indicative of light intensity responsive to the reflected light with a threshold, and calculates a width of the recording medium measured from a position of the detection unit where the value indicative of light intensity responsive to the reflected light becomes greater than or equal to the threshold; an image formation unit that performs an operation of forming an image based on the calculated width of the recording medium; and an image formation control unit that halts the operation of forming the image upon detecting that the calculated width is less than or equal to a predefined value.

Image forming apparatus, image forming method and storage medium

An image forming apparatus using a roll includes a power shutdown operation detector to detect an operation of shutting down power supply to the apparatus; a power supply switching unit to switch power supply condition to the apparatus; and an apparatus controller to control the apparatus. The apparatus controller controls a roll setting operation to set the roll ready for an image outputting operation, and controls the power supply switching unit based on detection of an operation that shuts down the power supply. The apparatus controller confirms whether the power shutdown operation detector detects the power shutdown operation when the roll setting operation is being conducted. When an operation that shuts down the power supply is detected, the apparatus controller aborts the roll setting operation and shuts down power supply to the apparatus.

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Kanagawa, Japan

Tomohiro Sasa