Fujitsu Corporation

Koichi Tezuka

Koichi Iida

Kazushi Uno

Kyoko Miyabe

Tohru Fujimaki

Takeshi Morikawa

Hiroyasu Yoshikawa

Satoshi Shimokawa

Yuzuru Yamakage

Yasumasa Iwamura

Satoshi Itami

Shingo Hamaguchi

Koji Matsumoto

Jun Kawai

Kyoko Tadaki

Goro Kawasaki

Nobuyuki Kanto

Tsuyoshi Matsumoto

Haruhiko Izumi

Hitoshi Komoriya

Satoru Ushijima

Akihiko Makita

Kosuke Yanai

Koichi Ilda

A distance measuring apparatus includes: a plurality of two-dimensional scanning laser sensors; and a control circuit configured to control the plurality of two-dimensional scanning laser sensors, wherein each of the two-dimensional scanning laser sensors includes a light projection system configured to project laser light for scanning a measurement target, and a light reception system configured to outputs a signal corresponding to a distance to the measurement target by using a multi-division light receiving element configured to receive return light of the laser light reflected by the measurement target, and the control circuit is configured to synchronize a scanning timing of the laser light projected by a light projection system of each of adjacent two-dimensional scanning laser sensors among the plurality of two-dimensional scanning laser sensors, and cause the adjacent two-dimensional scanning laser sensors to horizontally scan the laser light in a direction opposite from each other.

Distance measuring apparatus, distance measuring method, and non-transitory computer-readable storage medium for storing distance measuring program

An apparatus for distance measurement includes: a memory; and a processor coupled to the memory and configured to execute a detection process that includes detecting a measurement target in a measurement range through two-dimensional scanning of a scan angle range with laser light, and execute a changing process that includes changing a width of the scan angle range with the laser light so that sampling density has a certain value or higher based on a distance and a bearing angle from the apparatus to the measurement target.

Apparatus, method for distance measurement, and non-transitory computer-readable storage medium

A distance measuring apparatus measures a distance to a target from a plurality of directions, and includes sensors having identical two-dimensional scan type configurations that launch a laser beam and receive reflected light from the target by a multi-segment light receiving element, and a processor. The processor performs a process including specifying a receiving part of the multi-segment light receiving element of a first sensor, that receives a second laser beam launched from a second sensor in a state in which the target is non-detectable by the first sensor, adjusting a phase in a vertical scan direction of the second laser beam with respect to that of a first laser beam launched from the first sensor, until the receiving part no longer receives the second laser beam, and integrating range images from the first and second sensors after the phase is adjusted.

Distance measuring apparatus and distance measuring method

An apparatus for laser distance measurement includes: a light-projecting circuit for projecting laser light emitted from a laser diode; a filter for transmitting a specific wavelength and suppressing a wavelength other than the specific wavelength; a photodetector including a plurality of photodetector elements, and configured to receive the laser light projected from the light-projecting circuit and reflected from a measurement object through the filter; and a controller for controlling a relative incidence angle of the reflected laser light with respect to the filter, wherein the controller causes a photodetector signal, which is to be used for calculating a distance to the measurement object, to be outputted from a photodetector element of the photodetector at a position to which a shift of a light-condensing position of the reflected laser light occurs as a result of the control of the relative incidence angle from the light-condensing position before the control.

Apparatus, method for laser distance measurement, and non-transitory computer-readable storage medium

A distance measurement device controls an emission direction of a laser beam in a light projection device and a reception direction of a laser beam in a light reception device, obtains a reception intensity of the laser beam received by the light reception device, determines whether or not the laser beam received by the light reception device is a laser beam reflected by a target of distance measurement on the basis of a reception direction of the laser beam, a period of time between when the light projection device emits the laser beam and when the light reception device receives the laser beam, a reception intensity of the laser beam, and determination information, and calculates a distance to the target in a case when the laser beam received by the light reception device is the laser beam reflected by the target.

Distance measurement device, distance measurement system and distance measurement method

A distance measuring device executes a collection process that includes driving a MEMS mirror in each of a plurality of sensors and collecting a drive voltage of the MEMS mirror satisfying a given condition, executes a drive frequency determination process that includes determining a drive frequency of the MEMS mirror when measuring distances by the plurality of sensors based on the drive voltage of the MEMS mirror, and executes a control signal generation process that includes generating and transmitting a control signal to the plurality of sensors, the control signal including configuration information specifying the drive frequency as a drive frequency of the MEMS mirror in each of the plurality of sensors, the configuration information including the drive frequency determined by the drive frequency determination process.

Distance measuring device, distance measuring method, and non-transitory computer-readable storage medium

A distance measuring apparatus includes a projector configured to project laser beam at a projection angle to an object; a photodetector array in which a plurality of photodetectors are arranged; a condenser lens configured to concentrate, on the photodetector array, the laser beam reflected by the object positioned on a direction of the projection angle; a detector configured to detect an output of at least one of the photodetectors of the photodetector array; and a selector configured to select the photodetector from which the detector receives the output, depending on a distortion of an area on the photodetector array irradiated with the reflected laser beam when the projection angle is large, the area being determined by an angle of incidence of the reflected laser beam to the condenser lens, the angle of incidence being associated with the projection angle.

Distance measuring apparatus, distance measuring method, and table creating method

A distance measurement method, includes measuring a distance to an object by means of a distance measurement circuit of a distance measurement apparatus and by scanning a light beam; designating a first mode which controls a projection angle of the light beam so that sampling positions in a given number of successive scans do not overlap, when the distance to the object is greater than or equal to a threshold value, by using the processor; and designating a second mode which controls the projection angle of the light beam so that the sampling positions overlap in each scan, when the distance to the object is less than the threshold value, by using the processor.

Distance measurement apparatus, and distance measurement method

An object detection apparatus includes: a first radar configured to measure first positional information regarding a first object existing in a first scan range; a second radar configured to measure second positional information regarding a second object existing in a second scan range on the basis of second reflected wave of second wave radiated onto the second scan range including the first region and a second region, the second wave being radiated in such a way as to scan the first region in a direction opposite a direction in which the first radar radiates the first wave; and a processor configured to detect a third object existing in the first region on the basis of the first positional information and the second positional information.

Object detection apparatus and method

Provided is an objective lens for recording a hologram that condenses an recording beam on a hologram recording medium, and the objective lens is configured so as to condense, in the case where the recording beam is incident upon the objective lens in a form of a parallel beam flux, an on-axis beam flux and an off-axis beam flux contained in the parallel flux so as to form a beam waist in the hologram recording medium, and such that a distance between an off-axis image point of the off-axis beam flux that defines a largest field angle among the off-axis beam fluxes gradually converging ahead of the beam waist and the hologram recording medium becomes minimal.

Objective lens for recording hologram and hologram recording device

A hologram recorder includes a signal beam irradiator to irradiate a signal beam, which is optically modulated in accordance with information to be recorded, to a recording medium at a predetermined incident angle. The hologram recorder also includes a recording prism provided with surfaces including an incident surface, a reflective surface and an emission surface for light so that a recording reference beam is guided to the recording medium by way of these surfaces. A pivot mechanism of the hologram recorder causes the recording prism to pivot above the recording medium for changing the incident angle of the recording reference beam at the recording medium, with the recording reference beam kept to overlap the signal beam.

Hologram recorder

A hologram recorder applies a recording beam (S) and a reference beam (R) to the illumination site (p) of a hologram recording medium (B). The interference between the recording beam (S) and the reference beam (R) produces multiple hologram recording at the illumination site (p). The recorder includes a recording-purpose reference beam reflector () for reflecting the reference beam (R) to the illumination site (p), and a pivot mechanism for pivoting the reflector () about an axis (x) to vary the incident angle (&#x3b8;r) of the reflected reference beam (R) to the recording medium (B). The reflector () is disposed to cross a predetermined optical path. The axis (x) of the pivot mechanism is so arranged that the reflected reference beam (R) is directed to the illumination site (p) even when the incident angle (&#x3b8;r) of the beam (R) changes due to the pivoting of the reflector ().

Hologram recording apparatus and hologram recording/reproducing method

A hologram recording device records holograms by interference between an recording beam and a reference beam. The device includes an objective lens exhibiting a predetermined aberration. It is supposed that the laser beam applied to the beam splitter has an light intensity of 1, the recording beam and the reference beam emitted from the beam splitter have light intensities of P and 1&#x2212;P, respectively, the optical magnification for the recording beam traveling from the beam splitter to the objective lens is a, and N pixels are used for modulation of the recording beam in the spatial light modulator. When the recording beam at the predetermined region has an amplitude 1/k times the amplitude of the reference beam, and the amplitude of the recording beam is X times as great as when there is no aberration, the predetermined aberration of the objective lens is determined to satisfy the formula: 

Hologram recording device

A hologram recorder is provided, in which coherent light from a light source is split into a signal beam and a reference beam, and the signal beam is modulated by a spatial light modulator to be directed to a hologram recording medium, while the reference beam is directed to the hologram recording medium to overlap with the signal beam for recording a hologram on the hologram recording medium. The hologram recorder includes a beam phase modulator provided with a plurality of optical devices (') each configured to assume one of two modes such as ON mode and OFF mode, the ON mode for causing the reference beam to be passed or reflected in a predetermined direction toward the hologram recording medium, the OFF mode for causing the reference beam to be blocked or directed in another direction other than the predetermined direction. Each optical device (&#x2032;) provides a phase difference 0 or &#x3c0;. A phase modulation controller is also provided for individually controlling the optical devices (&#x2032;) to cause each of the optical devices to assume the ON mode or the OFF mode, thereby modulating the reference beam into a beam having a predetermined phase pattern.

An optical disc drive includes a light source and an objective optical system for condensing a light from the light source onto a recording surface of an optical disc. A chassis which is movable radially of the optical disc supports both the light source and the objective optical system. The light source includes a red/infrared unit having a red/infrared LD and a blue LD. The red/infrared LD generates both a red beam and an infrared beam. The blue LD generates a blue beam. The objective optical system includes a first and a second object lenses whose focal distances are different. The first and the second object lenses are disposed on a circumferential line of the optical disc.

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Kawasaki, Japan

Koichi Tezuka