公开(公告)号：US20220342049A1

公开(公告)日：2022-10-27

申请号：US17714296

申请日：2022-04-06

Applicant: Hitachi-LG Data Storage, Inc.

Inventor： Hisataka SUGIYAMA ,  Katsuhiko IZUMI ,  Katsumi ITO

IPC: G01S7/4865 ,  G01S17/10 ,  G01S7/4863

Abstract: The distance measurement system is a system for measuring a distance to a target by a time of flight of light using a plurality of distance measurement image pickup apparatuses. The plurality of distance measurement image pickup apparatuses emits pulsed light at different intervals having a relatively prime relationship. Further, an interval of pulsed light rays is set based on any one of (1) a value obtained by raising a prime number to a power of a natural number of 2 or more used as an exponent, (2) a value obtained by multiplying a prime number by a natural number of 2 or more used as an integer, and (3) a value obtained by multiplying the value obtained by raising the prime number to the power by a natural number of 2 or more used as an integer.

公开(公告)号：US20230044712A1

公开(公告)日：2023-02-09

申请号：US17868169

申请日：2022-07-19

Applicant: Hitachi-LG Data Storage, Inc.

Inventor： Katsumi ITO ,  Katsuhiko IZUMI ,  Hisataka SUGIYAMA

IPC: G01S17/894 ,  G01S17/10

Abstract: A distance measurement system includes a distance measurement device and an external processing device. Here, the distance measurement device receives reflected light from a subject for a plurality of exposure periods in a frame in which irradiation light is emitted, switches a plurality of distance calculation expressions according to an amount of charge measured for each exposure period, and calculates a measured distance to the subject from the amount of charge measured for each exposure period. The external processing device acquires the measured distance from the distance measurement device and performs data processing. Then, the external processing device predicts a measured distance including a distance error caused by an influence of multipath. The external processing device generates a correction expression for correcting the measured distance. The external processing device corrects the measured distance acquired from the distance measurement device using the correction expression.

公开(公告)号：US20210270971A1

公开(公告)日：2021-09-02

申请号：US17091029

申请日：2020-11-06

Applicant: Hitachi-LG Data Storage, Inc.

Inventor： Seiji INABA ,  Katsumi ITO

IPC: G01S17/894 ,  G01S17/08

Abstract: At a preparatory step for correction, in a state that a reflective tape made with a retroreflective material is pasted in advance onto a floor surface of a measurement space in a direction away from the distance-measuring device, a distance La to an inside area of the reflective tape, and a distance Lb to an outside area of the reflective tape adjacent to the inside area are measured by the distance-measuring device, while measurement positions Y are being scanned along the reflective tape. A correction formula for converting the distance Lb to the distance La is created from a relationship between the distance La and the distance Lb obtained at each measurement position Y. At an actual measurement step, a distance (actual measurement value x) to the target object measured by the distance-measuring device is corrected in accordance with the correction formula, and a measurement-distance corrected value y is calculated.

公开(公告)号：US20240159902A1

公开(公告)日：2024-05-16

申请号：US18378466

申请日：2023-10-10

Applicant: Hitachi-LG Data Storage, Inc.

Inventor： Katsumi ITO ,  Hisataka SUGIYAMA ,  Katsuhiko IZUMI

IPC: G01S17/10 ,  G01S7/4861 ,  G01S7/497

CPC classification number: G01S17/10 ,  G01S7/4861 ,  G01S7/497

Abstract: A distance measurement device comprises an irradiation unit that irradiates a measurement light onto an object to be measured, a light receiving sensor that receives reflected light from the object to detect an exposure amount based on the reflected light, a memory unit that stores correction information indicating a correction formula set including a plurality of correction formulas and an applicable distance range of each correction formula, and a distance calculation unit that calculates the measurement distance to the object to be measured based on the exposure amount. The distance calculation unit performs, based on the correction information stored in the memory unit, a distance correction calculation to calculate a corrected measured distance by correcting the measured distance using the correction formula corresponding to the applicable distance range in which the measured distance is included among the plurality of correction formulas in the correction formula set.

公开(公告)号：US20220342050A1

公开(公告)日：2022-10-27

申请号：US17714302

申请日：2022-04-06

Applicant: Hitachi-LG Data Storage, Inc.

Inventor： Hisataka SUGIYAMA ,  Katsuhiko IZUMI ,  Katsumi ITO

IPC: G01S7/4865 ,  G01S17/10 ,  G01S7/48

Abstract: The distance measurement system is a system for measuring a distance to a target by a time of flight of light using a plurality of distance measurement image pickup apparatuses. The plurality of distance measurement image pickup apparatuses may emit pulsed light rays at a plurality of different pulse widths. Further, intervals of pulsed light rays from the plurality of distance measurement image pickup apparatuses are set to be proportional to pulse widths in the respective distance measurement image pickup apparatuses. Further, the respective distance measurement image pickup apparatuses emit pulsed light rays at intervals of the pulsed light rays corresponding to pulse widths and the intervals of the pulsed light rays different from each other.

公开(公告)号：US20210231783A1

公开(公告)日：2021-07-29

申请号：US17086525

申请日：2020-11-02

Applicant: Hitachi-LG Data Storage, Inc.

Inventor： Katsumi ITO ,  Seiji INABA

IPC: G01S7/4865 ,  G01S7/497 ,  G01S17/10

Abstract: As a preparatory step for correction, a measurement sample is placed such that a distance of the measurement sample from the distance measuring device becomes a set value L1, a distance to the measurement sample 3′ is measured by the distance measuring device, and a measurement value L2 is obtained. The measurement value L2 corresponding to a plurality of values of the set value L1 is acquired, while the set value L1 is changed to the plurality of values, and a correction formula for converting the measurement value L2 to the set value L1 is created on a basis of a relationship between the acquired set value L1 and measurement value L2. As an actual measurement step, a distance (actual measurement value x) to the target object 3 measured by the distance measuring device is corrected in accordance with the correction formula, and a measurement-distance corrected value y is calculated.