公开(公告)号：US20250085424A1

公开(公告)日：2025-03-13

申请号：US18955708

申请日：2024-11-21

Applicant: DENSO CORPORATION

Inventor： Chihiro MORIGUCHI ,  Naoki YOSHIMOTO ,  Tetsuya SHIMOGAKI ,  Tatsuya YAMASHITA ,  Makoto NAKAI

IPC: G01S17/34 ,  G01S7/4915 ,  G01S17/36 ,  G01S17/931

Abstract: A frequency sweep characteristic measurement device splits the laser light to generate a difference in lengths of optical paths and combines the split laser lights to generate a combined light. This device receives the combined light, converts the received light into a beat signal, and outputs the beat signal. Further, this device adjusts a waveform so that an amplitude and a phase match at both ends of the beat signal, calculates a quadrature component by performing a Hilbert transform on the beat signal whose waveform has been adjusted, and calculates an instantaneous phase of the beat signal by calculating an inverse tangent of the quadrature component and the beat signal whose waveform has been adjusted. This device calculates the frequency sweep characteristic of the laser light based on the instantaneous phase and the difference in the lengths of the optical paths.

公开(公告)号：US20240329247A1

公开(公告)日：2024-10-03

申请号：US18744333

申请日：2024-06-14

Applicant: DENSO CORPORATION

Inventor： Yuichi TOYOTA ,  Taro BEPPU ,  Chihiro MORIGUCHI ,  Naoki YOSHIMOTO ,  Hiroyuki MATSUBARA ,  Tatsuya YAMASHITA ,  Tadashi ICHIKAWA

IPC: G01S17/42 ,  G01S7/4911

CPC classification number: G01S17/42 ,  G01S7/4911

Abstract: A laser radar device includes a transmission unit, a scanning unit, a distance calculation section, and a movement control unit. The transmission unit transmits laser light that has been subjected to frequency modulation. The scanning unit performs scanning with the laser light. For each of a plurality of partial regions obtained by dividing a laser light scanning region preset as a two-dimensional region which the scanning unit scans with the laser light, the distance calculation section receives the laser light that has been reflected by an object, and calculates a distance to the object in the partial region. The movement control unit controls movement of the laser light so that the laser light moves in the partial region, with Δθ>(1.22*λ/d) being met.

公开(公告)号：US20230324723A1

公开(公告)日：2023-10-12

申请号：US18192791

申请日：2023-03-30

Applicant: DENSO CORPORATION ,  TOYOTA JIDOSHA KABUSHIKI KAISHA ,  MIRISE Technologies Corporation

Inventor： Taku SUZUKI ,  Tatsuya YAMASHITA ,  Naoya TAKE ,  Masashige SATO

IPC: G02F1/015 ,  G02F1/025

CPC classification number: G02F1/0154 ,  G02F1/025 ,  G02F2203/50

Abstract: An optical phase modulator includes a rib part extending in an extending direction. The rib part includes an N-type first rib portion and a P-type second rib portion arranged in a width direction to have a PN junction therebetween along the extending direction. An N-type first slab portion is connected to the first rib portion and a P-type second slab portion is connected to the second rib portion to provide a PN structure with the rib part in a cross-section having a normal direction along the extending direction. A P-type third slab portion is connected to the first rib portion and an N-type fourth slab portion is connected to the second rib portion to have a PNPN structure with the rib part in a cross-section having a normal direction along the extending direction. The PN structure and the PNPN structure are alternately disposed in the extending direction.

公开(公告)号：US20190377697A1

公开(公告)日：2019-12-12

申请号：US16549480

申请日：2019-08-23

Applicant: DENSO CORPORATION

Inventor： Tatsuya YAMASHITA ,  Kenji YAMADA

IPC: G06F13/38 ,  G06F9/50

Abstract: A microcomputer including first and second CPUs is provided. The first and second CPUs may execute identical control programs in parallel. The microcomputer may control a write access by the first or second CPU. The microcomputer may compare an output of the first CPU with an output of the second CPU. Data is written to a write target unit. The microcomputer outputs a write response signal to the first and second CPUs when a data write destination of the first and second CPUs is the write target unit. The microcomputer outputs an abnormality determination signal when data output from the first CPU mismatches with data output from the second CPU. The microcomputer writes the data to the write target unit when the data write destination of the first and second CPUs is the write target unit and the abnormality determination signal is not input.