Ricoh Company, Ltd.

Yoichi Ichikawa

Kazuhiro Fujita

Takeshi Ogawa

Hiroaki Tanaka

Yasuhiro Nihei

Masahiro Itoh

Koji Masuda

Shigeaki Imai

Muneaki Iwata

Nobuyuki Arai

Shu Takahashi

Toshishige Fujii

Shohta Kobashigawa

Naoki Sakai

Yumiko Kishi

Hirotoshi Nakayama

Hiroki Hiraguchi

Asato Tamura

Hiroto Tachibana

Takuei Nishio

Rie Hirayama

A laser processing method includes: marking multiple concaves on a surface of a preform before blow molding.

Laser processing method and preform

A distance-measuring apparatus, a mobile object, a robot, a three-dimensional measuring device, a surveillance camera, and a distance-measuring method. The distance-measuring apparatus, a mobile object includes a light source to emit light, an imaging element to receive and photoelectrically convert the light into a plurality of electrical signals, and to obtain the electrical signals upon being sorted into a plurality of phase signals, and a computing unit to calculate distance to the object based on the phase signals. In the distance-measuring apparatus, a period of time during which the imaging element obtains the phase signals is different from a light emitting period of the light source in length. The distance-measuring method includes determining whether or not aliasing is present based on a light emitting period of the light source, a period of time during which the plurality of phase signals are obtained, and a result of the calculating.

Distance-measuring apparatus, mobile object, robot, three-dimensional measuring device, surveillance camera, and distance-measuring method

An distance measurement apparatus includes a light source to emit irradiation light, circuitry to output, to the light source, a first current that changes in accordance of light-emission timing information defining at least turn-on timing of the light source, and a second current that does not change in accordance of the light-emission timing information, a sensor to detect reflection light reflected from an object irradiated with the irradiation light emitted from the light source. The circuitry calculates a distance to the object based on a detection amount of the reflection light detected by the sensor.

Distance measurement apparatus, and method of measuring distance

A distance measurement device includes a projection optical system, a light-receiving system to receive light projected from projection optical system and reflected by an object; and a correction system to correct a difference in timing of light emission between the plurality of light sources. The projection optical system includes a plurality of light sources and a plurality of drive circuits to drive the plurality of light sources.

Distance measurement device, moveable device, and distance measuring method

An image display apparatus and a method of displaying an image. The image display apparatus includes an image-light projection device configured to display a display image, and a display controller configured to determine chromaticity coordinates of a display color of the display image based on data of a chromaticity coordinate area of background light such that the display color of the display image is set outside the chromaticity coordinate area of the background light. The method includes determining chromaticity coordinates of a display color of a display image based on data of a chromaticity coordinate area of background light such that the display color of the display image is set outside the chromaticity coordinate area of the background light.

Image display apparatus and image display method

A range finding apparatus includes a light emission unit including a light source and a light source driver, a light detection unit, and circuitry. The light source driver supplies a plurality of drive pulses having different pulse width at different time periods. The light detection unit receives the light emitted from the light emission unit and then reflected from an object. The circuitry calculates a range to the object based on a time difference between one time point when a pulse light is emitted from the light source and another time point when light reflected from the object is received by the light detection unit. One of the drive pulses set with a smaller pulse width is set with a sine wave pattern, and another one of the drive pulses set with a greater pulse width is set with a rectangular wave pattern.

Range finding apparatus, moveable apparatus, robot, three dimensional measurement apparatus, method of measuring three dimensional information, and storage medium

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Kanagawa, Japan

Yoichi Ichikawa