Ricoh Company, Ltd.

Sumitomo Electric Industries, Limited

Fujitsu Corporation

Ricoh Optical Industries Co., Ltd.

Kenji Koyama

Yoshihiro Yoneda

Yoshimi Ohno

Hirohiko Kobayashi

Kanetake Takasaki

Ikuya Tsurukawa

Masaki Yanagisawa

Kenji Hiratsuka

Mikio Takagi

Atsuhiro Tsukune

Yoshio Serikawa

Akira Ueno

Hideki Yagi

Hiroshi Takeda

Jun-ichi Hashimoto

Tsukuru Katsuyama

Daisuke Hata

Hiroyuki Yoshinaga

Susumu Iguchi

Keiji Himuro

Kuniaki Ishihara

Tomoya Kitajima

Kunihiko Araki

Hiroshi Terui

Mikio Kobayashi

Takashi Hongoh

Kousaku Sawabe

Shigeru Mitsu

Yoshihiko Shimura

Yukihisa Narazaki

Masahide Nishimura

A semiconductor optical integrated device includes a substrate having a main surface with a first and second regions arranged along a waveguiding direction; a gain region including a first cladding layer, an active layer, and a second cladding layer arranged on the first region of the main surface; and a wavelength control region including a third cladding layer, an optical waveguide layer, and a fourth cladding layer arranged on the second region of the main surface and including a heater arranged along the optical waveguide layer. The substrate includes a through hole extending from a back surface of the substrate in the thickness direction and reaching the first region. A metal member is arranged in the through hole. The metal member extends from the back surface of the substrate in the thickness direction and is in contact with the first cladding layer.

Semiconductor optical integrated device

A method for producing a semiconductor optical integrated device includes the steps of forming a substrate product including first and second stacked semiconductor layer portions; forming a first mask on the first and second stacked semiconductor layer portions, the first mask including a stripe-shaped first pattern region and a second pattern region, the second pattern region including a first end edge; forming a stripe-shaped mesa structure; removing the second pattern region of the first mask; forming a second mask on the second stacked semiconductor layer portion; and selectively growing a buried semiconductor layer with the first and second masks. The second mask includes a second end edge separated from the first end edge of the first mask, the second end edge being located on the side of the second stacked semiconductor layer portion in the predetermined direction with respect to the first end edge of the first mask.

Method for producing semiconductor optical integrated device

A process to manufacture a semiconductor optical modulator is disclosed, in which the process easily forms a metal film including AuZn for the p-ohmic metal even a contact hole has an enhanced aspect ration. The process forms a mesa including semiconductor layers first, then, buries the mesa by a resin layer sandwiched by insulating films. The resin layer provides an opening reaching the top of the mesa, into which the p-ohmic metal is formed. Another metal film including Ti is formed on the upper insulating film along the opening.

Semiconductor optical modulator and method for manufacturing the same

A method of making a semiconductor optical integrated device includes the steps of forming, on a substrate, a plurality of semiconductor integrated devices including a first optical semiconductor element having a first bonding pad and a second optical semiconductor element; forming a plurality of bar-shaped semiconductor optical integrated device arrays by cutting the substrate, each of the semiconductor optical integrated device arrays including two or more semiconductor optical integrated devices; alternately arranging the plurality of semiconductor optical integrated device arrays and a plurality of spacers in a thickness direction of the substrate so as to be fixed in place; and forming a coating film on a facet of the semiconductor optical integrated device array. Furthermore, the spacer has a movable portion facing the first bonding pad, the movable portion protruding toward the first bonding pad and being displaceable in a protruding direction.

Method of making semiconductor optical integrated device by alternately arranging spacers with integrated device arrays

A method for manufacturing an LD is disclosed. The LD has a striped structure including an optical active region. The striped structure is buried with resin, typically benzo-cyclo-butene (BCB). The method to form an opening in the BCB layer has tri-steps etching of the RIE. First step etches the BCB layer partially by a mixed gas of CFand O, where CFhas a first partial pressure, second step etches the photo-resist patterned on the top of the BCB layer by a mixed gas of CFand O, where CFin this step has the second partial pressure less than the first partial pressure, and third step etches the BCB left in the first step by mixed gas of CFand O, where CFin this step has the third partial pressure greater than the second partial pressure.

Method for manufacturing semiconductor laser diode

An image recording apparatus includes an image sensing part for converting an optical image imaged by a photograph lens to an electric signal, a distance measuring part for measuring a distance between a target object and the image recording apparatus, an illumination part for generating an illumination light and a pre-illumination light, a first illumination controlling part for controlling the amount of the illumination light of the illumination part based on the measured distance of the distance measuring part and a F number of the photograph lens, a second illumination controlling part for controlling the amount of the illumination light of the illumination part based on the electric signal output from the image sensing part in correspondence with the pre-illumination light, and a selecting part for selecting one of the first illumination controlling part and the second illumination controlling part.

Image recording apparatus, image recording method, and computer-readable recording medium

An image-recording apparatus includes a display unit for displaying an image photographed by an sensing device, an illuminating unit for emitting light by discharging charges charged in a capacitor on photographing, a power source unit in which any one of plural kinds of power sources is selectively usable, and a power source detector to detect which kind of the power source is being used in the power source unit. Displaying on the display unit and charging of the capacitor are performed by using the power source in the power source unit. When the power source detector detects that the power source unit uses a specified kind of the power source, the display unit is operated even during charging the capacitor, whereas when the power source detector detects that the power source other than said specified one is being used in the power source detector unit, the display unit is set in no operation during charging the capacitor.

Image-recording apparatus

The present invention provides an optical device integrating an active device with a passive device without any butt joint structure between two devices. The optical integrated device of the invention includes a GaAs substrate, first and second cladding layers, and an active layer sandwiched by the first and second cladding layers. These layers are disposed on the GaAs substrate. The GaAs substrate provides a first region and a second region. The active layer comprises of the first active layer disposed on the first region and the second active layer disposed on the second region of the GaAs substrate. The first active layer has a quantum well structure whose band-gap energy smaller than 1.3 eV, while the second active layer has a quantum well structure whose band-gap energy is greater than that of the first active layer.

Optical integrated device

A direct current motor including a rotor having a rotation shaft and rotor coils, a stator configured to apply a magnetic field to the rotor via magnetic poles of the stator opposing magnetic poles of the rotor, an electrical parts mounting base board fixed on the rotation shaft such that the rotation shaft perpendicularly intersects the electrical parts mounting base board, and a commutator having a contact electrode part formed with a plane conductive layer pattern and connected to the rotor coils. The contact electrode part is formed on the electrical parts mounting base board. The direct current motor further includes a pair of electrode brushes in sliding contact with the contact electrode part of the commutator and configured to supply electric power to the rotor coils though the commutator.

DC motor

A direct current motor rotation control apparatus, a method and device for controlling a rotational speed of a direct current motor, and an apparatus having the direct current motor rotation control apparatus. The apparatus and device control rotational operations of a direct current motor such that the direct current motor rotation control apparatus includes at least one rotation detecting brush which detects a signal indicative of an operation of the direct current motor, a motor driving circuit which drives the direct current motor by applying the direct current drive voltage to the pair of electrode brushes, a reference voltage generating device which generates a reference voltage a comparator which compares a voltage detected by the rotation detecting brush with the reference voltage generated by the reference voltage generating device and produces an output comparison voltage, and a motor control circuit which adjusts the direct current drive voltage based on the output comparison voltage. The direct current motor includes including a stator, a rotor with a rotation shaft and rotor coils, a commutator connected to the rotor coils, and a pair of electrode brushes in sliding contact with the commutator. The at least one rotation detecting brush contacts the commutator at a different axial position from an axial position contacted by the pair of electrode brushes. The comparator can compare a voltage detected by the rotation detecting brush with the reference voltage generated by the reference voltage generating device and produces as a comparison voltage output pulses of voltage. As such, the motor control circuit can determine an instantaneous rotational speed and adjust the drive voltage to the pair of electrode brushes accordingly.

DC motor rotation control apparatus

A rotation detector apparatus and a rotation control apparatus for the DC motor is disclosed wherein rotational operations of a rotor of the DC motor are controlled by detecting at least one of the rotational direction, the rotational speed, the cumulative rotation number, and the rotational position of the rotor. The pulsed output signal from at least one motor rotor rotation detector brush is processed by signal processing circuitry to regulate the at least one of the rotational direction, the rotational speed, the cumulative rotation number, and the rotational position of the rotor.

DC motor rotation detecting apparatus and DC motor rotation control apparatus

A direct current motor rotation detecting apparatus and a direct current motor rotation control apparatus detect and control at least one of a rotational direction, a rotational speed, a rotational position, and a cumulative rotation number of a rotor of a direct current motor. The apparatus include at least one rotation detecting brush which detects a rotation of the rotor, a differentiating circuit which differentiates a voltage obtained through the at least one rotation detecting brush, and a pulse generator triggered by the differentiating circuit at a time interval proportional to a rotational speed of the direct current motor to generate pulses having a predetermined pulse width.

A pulse-controlled camera has a single motor capable of conducting a drive of a photo-taking lens and a drive of opening and closing of shutter blades at a high speed with a high reliability and a high precision in a compact structure, in which mechanical errors in machining and assembling may be electrically adjusted and which can facilitate automatic assembling. The pulse-controlled camera comprises a basic reciprocating member which is rotated in a forward direction or in a backward direction with respect to a home position by a pulse motor. The forward rotation of the basic, reciprocating member from the home position also rotates a lens feeding member through a ratchet base plate in the forward direction, so that a cam action of the lens feeding member feeds a lens holding frame up o a position corresponding to a measured distance value. Then the basic reciprocating member rotates in the backward direction while leaving the ratchet plate at the position, passes the home position, and rotates a shutter blade opening and closing lever by an engaging pin thereof to open the shutter blades. The home position of the basic reciprocating member is set based on a timing when a home position signal generating portion interrupts a beam for detection of a photo interrupter.

Pulse-controlled camera, method for setting control reference position

A flashing apparatus of an automatic light-adjusting type for illuminating a photographed object by discharging a charge charged to a main capacitor from a light emitting tube has an energy amount detector for detecting an energy amount applied to the light emitting tube from the main capacitor; an energy amount setting device for setting an amount of discharged energy of the main capacitor corresponding to a quantity of light required to illuminate the photographed object; a comparator for comparing the energy amount detected by the energy amount detector with the energy amount set by the energy amount setting device; and a light emission stopping device for stopping light emission of the light emitting tube by a signal outputted from the comparator when the comparator detects that the discharged energy amount of the main capacitor is in conformity with the set amount of the energy amount setting device after the light emission is started. The flashing apparatus may further has a voltage detector constituting the energy amount detector and detecting a voltage applied to the light emitting tube from the main capacitor; an electric current detector for detecting an electric current flowing through the light emitting tube; a multiplying device for multiplying the detected voltage by the detected electric current; an integrator for integrating the multiplied results; etc.

Flash control based on calculated required flash energy

A CVD method comprises the steps of making a plasma self-cleaning within a chamber using a gas which includes fluorine, coating an inside of the chamber by a first layer of a material which includes silicon and nitrogen, and forming a second layer on a predetermined surface within the chamber by a chemical vapor deposition. The second layer is made of a material which includes a quantity of nitrogen smaller than a quantity of nitrogen included in the first layer.

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Yokohama, Japan

Kenji Koyama