Ricoh Company, Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Hideyuki Kihara

Takuroh Sone

Takashi Soma

Kazuyo Ohta

Akihiro Iwamatsu

Yusuke Taneda

Takayuki Gotoh

Yuta Nagata

Kyohei Kada

Tomohiro Ukai

Naoto Watanabe

Takeshi Ogawa

Naoki Nakamura

Masato Yoshida

Shuhei Watanabe

Kiyotaka Inagaki

Hiroshi Yajima

Shigenori Arai

Takahiro Uehara

Yoshihito Kawakami

Yohei Nagatake

Kazuhiro Suzuki

Takaoki Matsumoto

Takafumi Hiroi

Katsumi Nagumo

An information processing apparatus includes processing circuitry. The processing circuitry detects an abnormality in an image reading apparatus from a first spectral reflectance and a second spectral reflectance, the first spectral reflectance being generated based on data read from a reference white plate installed in the image reading apparatus, the second spectral reflectance being generated before generation of the first spectral reflectance, and identifies a cause of an abnormality in the image reading apparatus in a case where the processing circuitry detects the abnormality.

Information processing apparatus, abnormality detection method, storage medium, and information processing system

A color chart is for evaluating printing quality of an image forming apparatus. The color chart includes identification information and a color evaluation patch. The identification information is on an image forming apparatus on which evaluation of printing quality is to be performed. The color evaluation patch includes a plurality of color patches for performing evaluation of printing quality on the image forming apparatus indicated by the identification information.

Color chart, information processing apparatus, and information processing system

A color chart is for performing color adjustment on an image forming apparatus. The color chart includes identification information and a color adjustment patch. The identification information is on an image forming apparatus to which color adjustment is to be applied. The color adjustment patch includes a plurality of color patches for performing color adjustment on the image forming apparatus indicated by the identification information.

Color chart for performing color and in-plane unevenness on an image forming apparatus

An evaluating method includes obtaining, by an imaging device, a two-dimensional reflected light amount distribution of a surface of a target; classifying, by one or more processors, the surface into a plurality of areas on the basis of chromaticity information of the two-dimensional reflected light amount distribution; and evaluating, by one or more processors, appearance characteristics of the target on the basis of respective sets of chromaticity information of the areas.

Evaluator, measurement apparatus, evaluating method, and non-transitory recording medium

An evaluation device includes a projector to project a pattern having an edge component onto an object, an imaging device to capture an image of the object, a reflective-property correction unit to correct an amount of change in shape of a virtual image of the pattern reflected in the object, using reflective-property data of a surface of the object, and an evaluation-value calculator to evaluate image clarity of the surface of the object based on the corrected amount of change. A computer-readable non-transitory recording medium storing a program for causing a computer to execute a method. The method includes correcting an amount of change in shape of a virtual image of the pattern reflected in the object based on image data that is obtained by capturing an object onto which a pattern having an edge component is projected, using reflective-property data of a surface of the object.

Evaluation device and recording medium storing evaluation program

A texture evaluation apparatus includes a projector, an imager, and an evaluator. The projector is configured to project a two-dimensional pattern having an edge element onto an object. The imager is configured to capture an image of a surface of the object. The evaluator is configured to calculate an amount of shape change of a virtual image of the two-dimensional pattern in the image, and evaluate texture of the object based on the amount of shape change and sensory evaluation information obtained in advance.

Texture evaluation apparatus, texture evaluation method, and computer-readable recording medium

A color measurement apparatus includes at least one illuminator, an imager, and circuitry. The circuitry is configured to normalize each pixel included in an imaging region of one of the spectral reflectance images of the measurement target irradiated with light at a specific illumination angle of the plurality of illumination angles, with one of the spectral reflectance images of the reference object irradiated with light at the specific illumination angle, for each of the plurality of illumination angles so as to generate normalized spectral reflectance images of the measurement target. The circuitry further calculates a numerical value of at least one color for each pixel of the normalized spectral reflectance images of the measurement target, for respective ones of the plurality of illumination angles, to measure color of the surface of the measurement target.

Color measurement apparatus and color information processing apparatus

A power reception device in a power transmission system including a power transmission device including a primary coil and the power reception device including a secondary coil, the power transmission device being configured to drive the primary coil and transmit AC power corresponding to a clock signal which is frequency-modulated according to a binary data signal, the primary coil and the secondary coil being electromagnetically coupled together to receive by the secondary coil in the power reception device, the AC power transmitted from the power transmission device, comprises a clock-signal extraction circuit configured to extract the clock signal from an induced voltage induced at one end of the secondary coil in receiving the AC power; and a demodulation circuit configured to generate a pulse synchronously with the clock signal extracted by the clock-signal extraction circuit, and demodulate the pulse to obtain the binary data signal.

Power reception device and power transmission system

An electrophotographic image forming apparatus for forming an image in accordance with image information includes: an image forming unit configured to form an image that is uniform in area percentage of each of primary colors and a secondary color on an intermediate transfer belt; a measurer configured to measure amounts corresponding to density distribution of residual toner left on the intermediate transfer belt, on which the image uniform in area percentage of each of the primary colors and the secondary color is formed and from which toner is transferred onto a recording medium, in the main-scanning direction; and a corrector configured to correct a tone value of the image information so as to reduce density nonuniformity of a streak region observed in the density distribution in the main-scanning direction using the amounts measured by the measurer.

Image forming apparatus, image processing method, and computer-readable recording medium for image tone correction

A constant-voltage circuit having an overcurrent protection circuit which includes: a first sense transistor, one main terminal connected to an input terminal of the constant-voltage circuit and a control terminal connected to a control terminal of an output transistor generates a current corresponding to an output current from the output transistor; a voltage level adjusting circuit configured to generate a voltage corresponding to a voltage of a main terminal of the output transistor at an output terminal side of the constant-voltage circuit by extracting a current that is not affected by a change in the output current from the output transistor, and adjust a voltage of another main terminal of the first sense transistor such that the adjusted voltage becomes equal to the generated voltage; and a protection circuit to control a control voltage applied from an error amplifier to the control terminal of the output transistor.

Constant-voltage circuit

A power transmission device in a power transmission system including the power transmission device including a primary coil and a power reception device including a secondary coil, the primary coil being electromagnetically coupled to the secondary coil, to receive in the power reception device AC power transmitted from the power transmission device, comprises a waveform monitor circuit configured to detect an electric potential at one end of the primary coil and output a waveform monitor signal formed by restricting the detected electric potential to an electric potential which is equal to or higher than a ground electric potential; a waveform detection circuit configured to detect a waveform change in the waveform monitor signal input from the waveform monitor circuit; and a data detection circuit configured to detect data transmitted by load change by a load modulation unit in the power reception device based on a result of detection of the waveform change detected by the waveform detection circuit.

Power transmission device and waveform monitor circuit for use in power transmission device

Provided is a random number generating device capable of generating highly irregular random numbers with a simple configuration. The random number generating device includes: a receiving unit including a receiving mechanism configured to receive, in a contactless manner, energy transmitted from a transmitting unit, the receiving unit being configured to convert the energy received by the receiving mechanism into a reception voltage; a voltage controlled oscillator configured to output an oscillating output signal based on the reception voltage; and a pseudorandom number generator configured to generate pseudorandom numbers varying in accordance with an oscillation frequency of the output signal from the voltage controlled oscillator.

Random number generating device

A semiconductor switch circuit is provided that enables current consumption to be reduced even in a conduction state. A semiconductor switch circuithas P-type MOS transistors Qand Qfor conduction that share a source and are connected in series between an input/output terminaland input/output terminal, a P-type MOS transistor Qand N-type MOS transistor Qhaving drains connected to the gate of Q, a P-type MOS transistor Qand N-type MOS transistor Qhaving drains connected to the gate of Q, and a control terminalconnected to the gates of the transistors. Further semiconductor switch circuitis configured with the sources and back gates of Qand Qconnected to the sources of Qand Q. Therefore, it is possible to switch the path between input/output terminaland input/output terminalbetween a conduction state and non-conduction state by means of voltage control by voltage value Vcont of a control signal applied to control terminal

Semiconductor switch circuit

The tolerant buffer circuit and interface are provided in which reverse inflow of current to a power supply voltage from an output terminal does not occur, even if the output terminal is at a higher potential than an output circuit power supply voltage during open-drain operation in an output circuit of a semiconductor integrated circuit, or if the output circuit power supply voltage becomes 0 V. A tolerant buffer circuit is provided with first and second PMOS transistors that are connected in series and that share a source between a power supply terminal and an output terminal, an NMOS transistor connected between the output terminal and a ground terminal, a first inverter output-connected to the gate of the first PMOS transistor, a second inverter output-connected to the gate of the second PMOS transistor, and a control circuit that outputs first, second, and third control signals to the first PMOS transistor, the second PMOS transistor, and the NMOS transistor, respectively, and controls the on/off state of these MOS transistors.

Tolerant buffer circuit and interface

A data receiving apparatus which makes it possible to obtain reliable received data during EOP period and a preceding period, and which makes it possible to receive serial data in a reliable manner. Data receiving apparatusis provided with receiving comparatorwhich has first signal lineand second signal linefor differential input; NOR circuitthat outputs a logical output, as a trigger signal, at the time the first signal and the second signal have changed from out-of-phase to in-phase; and D-FF circuitthat retrieves, by means of a trigger signal from NOR circuit, and holds an output RCV of receiving comparator; wherein selection circuitselects the output of receiving comparator, when the first signal of first signal lineand the second signal of second signal lineare out-of-phase with each other, and outputs, as received data, a value held in D-FF circuit, when the first signal and the second signal have changed from out-of-phase to in-phase.

Growing community of inventors

Kanagawa, Japan

Hideyuki Kihara