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Distance measuring apparatus

A distance measuring device and distance technology, which are applied in the direction of measuring device, measuring distance, line-of-sight measurement, etc., can solve problems such as inability to accurately calculate the distance of objects

Inactive Publication Date: 2018-12-25
OMRON AUTOMOTIVE ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the maximum value of the output signal from the photoreceiver or the time from when the light pulse is irradiated until the reflected light is received cannot be accurately detected, the distance to the object cannot be accurately calculated

Method used

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Embodiment Construction

[0038] Embodiments of the present disclosure are described below with reference to the accompanying drawings. In the figures, the same or equivalent components are designated by the same reference numerals. In embodiments of the present disclosure, numerous specific details are set forth in order to provide a more thorough understanding of the invention. It will be understood, however, to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known features have not been described in detail in order not to obscure the invention.

[0039] figure 1 is a view illustrating a state in which the optical system of the distance measuring device 100 is viewed from above. figure 2 is an example of the optical system of the distance measuring device 100 when viewed from the rear (in figure 1 The lower side in , that is, the side opposite to the object 50) is a view of the state when the optical system is ...

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Abstract

A distance measuring apparatus includes: a light emitter emitting a light pulse, a light receiver receiving reflected light of the light pulse by an object, a comparator that compares an output signalfrom the light receiver to a threshold and outputs a predetermined signal when the output signal is larger than the threshold, and a distance calculator that detects a reception time of the reflectedlight when the comparator outputs the predetermined signal and calculates a distance to the object based on the reception time and an irradiation time of the light pulse. The distance measuring apparatus further includes a maximum value detector that detects a maximum value of the output signal from the light receiver during a non-light receiving period, and a threshold setting unit that sets thethreshold in the non-light receiving period based on the maximum value.

Description

[0001] Cross References to Related Applications [0002] This application is based on Japanese Patent Application No. 2017-116633 filed with the Japan Patent Office on June 14, 2017, the entire contents of which are hereby incorporated by reference. technical field [0003] The present disclosure relates to a distance measuring device that measures a distance to an object based on the timing when a light pulse is emitted from a light transmitter and the time when reflected light of the light pulse is received from the object by a light receiver. Background technique [0004] For example, optical distance measuring devices such as lidar are installed on vehicles with collision avoidance functions. In this distance measuring device, a light pulse is emitted from a light-emitting element of a light transmitter, light reflected by an object of the light pulse is received by a light-receiving element of a light receiver, and based on the irradiation timing of the light pulse and ...

Claims

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Application Information

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IPC IPC(8): G01S17/93G01S7/486G01C3/06G01S7/4861G01S7/4863G01S7/4865G01S17/10G01S17/931
CPCG01C3/06G01S7/486G01S17/931G01S17/10G01S17/42G01S7/4814G01S7/4816G01S7/4817G01S7/4863G01S7/4873G01S7/4865G01S7/4861
Inventor 一柳星文
Owner OMRON AUTOMOTIVE ELECTRONICS CO LTD
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