Fujitsu Corporation

Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Fujitsu Optical Components Limited

Tomohisa Ishikawa

Naoyuki Enomoto

Yozo Kashima

Tetsuharu Watanabe

Yang Liu

Akihito Toyoda

Yoshihiro Takeshita

Shin Otake

Hiroyuki Furukawa

Akira Okamoto

Tetsuo Watanabe

Tatsuro Kunikane

Yoshimitsu Sakai

Katsuhiko Hakomori

Sadayuki Miyata

Hiroshi Kuzukami

Gan Oda

Tatsuya Nishimura

A control device of modulating signal generates high-side signal and low-side signal. The high-side signal takes level in accordance with level of AC component of a monitor signal obtained by photoelectric conversion of modulated light, when the polarity of the AC component is positive, or its magnitude is zero. The high-side signal further takes constant level when the polarity of the AC component is negative. The low-side signal takes constant level when the polarity of the AC component is positive. The low-side signal further takes level in accordance with level of the AC component when the polarity of the AC component is negative, or its magnitude is zero. Then, the control device adjusts level of the modulating signal based on a greatest value of absolute values of levels taken by the high-side signal and a greatest value of absolute values of levels taken by the low-side signal.

Control device of modulating signal and method

An image forming apparatus includes a function providing unit, a display, a power storage apparatus, a holding unit, and a display controller. The function providing unit provides multiple functions including an image forming function and one or more server functions. The display displays a first operation screen for operating the multiple functions. The power storage apparatus performs power supply to the image forming apparatus when power supply from an external power supply is absent. The holding unit holds setting information in which a stoppage target function and a running target function among the multiple functions are specified. The stoppage target function and the running target function are respectively stopped and run during the power supply from the power storage apparatus. The display controller performs control during the power supply from the power storage apparatus. The control is performed to display, on the display, a second operation screen indicating that the stoppage target function is unusable and the running target function is usable.

Image forming apparatus, non-transitory computer readable medium, and image forming system

An image forming apparatus includes a section that provides plural functions which include an image forming function and one or more server functions; a power storage device that is capable of supplying electricity to the image forming apparatus in a case where electricity is not supplied from an external power source; a reception section that receives and holds an input of setting information, which defines a stop target function or a work target function in a case where the electricity is supplied from the power storage device, from a user; and a controller that performs control to cause the stop target function, which is defined in the setting information, to be stopped among the plural functions, or performs control to cause the work target function, which is defined in the setting information, to be worked in the case where the electricity is supplied from the power storage device.

Image forming apparatus, non-transitory computer readable medium storing program, and image forming system

An information processing apparatus includes a processing unit that performs a process, a controller that performs a control operation to cause the processing unit to perform the process requested by a hypertext transfer protocol (HTTP) request from a display apparatus that displays process results of the process, and a notification unit that notifies the display apparatus of the process results through communication different from an HTTP response responsive to the HTTP request having requested the process to be performed.

Information processing apparatus, information processing system, information processing method, and non-transitory computer readable medium

An image processing apparatus includes a reception unit, an acquisition unit, an enlarging/reducing unit, and a detector. The reception unit receives two image data to be compared. The acquisition unit acquires character sizes of characters contained in the two image data received by the reception unit. The enlarging/reducing unit enlarges or reduces the image data received by the reception unit such that the character sizes of the characters contained in the two image data acquired by the acquisition unit coincide with each other. The detector detects a difference between the two image data which have been enlarged or reduced by the enlarging/reducing unit such that the character sizes of the characters contained in the two image data coincide with each other.

Image processing apparatus, image forming apparatus, and computer readable medium

An information processing apparatus includes a first receiving unit that receives authentication information from software that functions as a web client through a first communication path using a first communication protocol; a transmitting unit that, if authentication using the received authentication information is successful, permits communication through the first communication path, and transmits access permission information to the software through the first communication path; a second receiving unit that receives an establishment request for a second communication path using a second communication protocol different from the first communication protocol, from the software; and an establishing unit that, if the transmitted access permission information is included in the received establishment request, establishes the second communication path to the software.

Information processing apparatus, system, storage medium, and information processing method for establishing communication path

An image processing apparatus includes a difference detector that detects a difference between two images according to a set detection condition, a receiving unit that receives the two images as comparison targets and a target difference image that is desirable in difference detection of the two images, and a setting unit that selects a detection condition from predetermined detection conditions and sets the selected detection condition in the difference detector, the selected detection condition causing a difference image that is acquired by the difference detector from the two images received by the receiving unit to be closer to the target difference image.

Image processing apparatus, image forming apparatus, image processing method, and non-transitory computer readable medium for detecting difference between images

An image processing apparatus includes a receiving unit, a detecting unit, and a generating unit. The receiving unit receives two pieces of image data to be compared with each other. The detecting unit detects the difference between the two pieces of image data received by the receiving unit. If a drawing element in the image data where the difference is detected by the detecting unit is dense with modified parts to such an extent that it is estimated to be difficult to identify the content of modification in the display of the difference, the generating unit generates difference image data indicating the difference between the two pieces of image data for comparison by adding an auxiliary image to highlight the content of the detected difference.

Image forming apparatus, image processing apparatus, image forming method, image processing method, and non-transitory computer readable medium

An optical transmission device in which: a first cyclic filter with a fixed transmission wavelength characteristic and a second cyclic filter with a variable transmission wavelength characteristic are combined, and the transmission wavelength characteristic of the second cyclic filter is changed according to a target wavelength, to thereby control the relative phase relationship of the transmission wavelength characteristics of the first and second cyclic filters. Moreover a light source is controlled according to a monitored value of the transmittance of the second cyclic filter with respect to the control target light, to thereby match the wavelength of the control target light with the target wavelength. Consequently, it is possible, with a simple configuration using a combination of two cyclic filters, to variably control wavelength at arbitrary wavelength intervals at a high level of precision.

Wavelength control method and optical transmission device

A light source error detection system and method including monitoring a plurality of characteristics of a light source and controlling the light source based on a plurality of monitored results. The system and method control the light source differently for a first case when only one of the monitored characteristics is abnormal than a second case when more than two of the monitored characteristics are abnormal. In controlling the light source, an output power of the light source is decreased with different time constant for the first case and the second case.

Light source error detection apparatus and method

Disclosed herein is a system including a first optical fiber transmission line, a plurality of second optical fiber transmission lines, a branching section for optically connecting these first and second optical fiber transmission lines, a monitor device optically connected to the first optical fiber transmission line, and a plurality of reflecting sections respectively provided in the vicinity of open ends of the second optical fiber transmission lines. The monitor device outputs monitor light through the first optical fiber transmission line and the branching section to each of the second optical fiber transmission lines. The reflecting sections reflect the monitor light to thereby generate identification optical signals having different patterns for respectively identifying the second optical fiber transmission lines. With this configuration, the monitor device can detect an abnormality in each of the second optical fiber transmission lines according to the presence of absence of the corresponding identification optical signal.

Method and system for monitoring of optical transmission lines

An optical network system for bidirectional transmission between a main system (e.g., central station) and a plurality of auxiliary systems (e.g., subscriber's stations). The main system outputs a main optical signal to a main fiber. The auxiliary systems output auxiliary optical signals to a plurality of auxiliary fibers, respectively. The main fiber and the auxiliary fibers are network-connected by a connecting unit. The main system has a detector for detecting the auxiliary optical signals and a control signal generator for generating a control signal including data for designating a specific auxiliary system whose auxiliary optical signal is not detected. The main optical signal in the auxiliary fiber corresponding to the specific auxiliary system is attenuated according to the control signal. Accordingly, laser hazard in each auxiliary system is prevented.

Optical network system

An optical beam splitting device which selectively disables a faulty output port to stop further emission of the optical beam therefrom. When an optical fiber cable is broken or a cable plug is disconnected, some part of the optical beam is reflected at the fiber end face that is left open. An optical sensing device, such as a photodiode, equipped in the beam splitting device receives this reflected light and transduces it into an electrical signal. A reflection detection controller examines this electrical signal and recognizes the presence of the back reflection if the electrical signal exceeds a predetermined reference level. The reflection detection controller then sends a beam control signal to an external modulator disposed at that faulty output port. With the beam control signal, the external modulator varies the intensity of the light beam so that only a limited power will be delivered to the faulty port where the back reflection is observed.

Optical beam splitting device and method of controlling optical beam

An optical module includes a photodiode disposed in front of a laser diode with an offset from an optical axis of the laser diode, for monitoring the power of an optical beam emitted from the laser diode in a forward direction. The optical module further achieves switching between a transmission mode and a reception mode in response to a drive current supplied to the laser diode.

Growing community of inventors

Kanagawa, Japan

Tomohisa Ishikawa