Title:
OPTICAL RANGING DEVICE, OPTICAL RANGING METHOD, AND IMAGE PROJECTION APPARATUS PROVIDED THEREWITH
Document Type and Number:
WIPO Patent Application WO/2017/064787
Kind Code:
A1
Abstract:
The purpose of the present invention is to correct a circuit delay time and time resolution variation, which cause a decrease in the measurement accuracy of an optical ranging device, at high speed in a short time.
For this purpose, an optical ranging method of an optical ranging device for calculating a distance by a time difference between an emitted light signal and a received light signal is configured to: provide, in the optical ranging device, at least two reference objects the distances and angles of which from a light reception unit for receiving the received light signal are different; measure time differences of the plurality of reference objects by a time measurement unit for measuring a time difference; calculate the circuit delay time of the light reception unit and the measurement resolution of the time measurement unit by performing a predetermined calculation on the plurality of time differences; and calculate a distance to an object to be measured on the basis of the calculation results of the circuit delay time and the measurement resolution.
Inventors:
SHIGAKI MASANOBU (JP)
YAMAMOTO SHOJI (JP)
URATA HIROYUKI (JP)
YAMAMOTO SHOJI (JP)
URATA HIROYUKI (JP)
Application Number:
PCT/JP2015/079140
Publication Date:
April 20, 2017
Filing Date:
October 15, 2015
Export Citation:
Assignee:
HITACHI MAXELL (JP)
International Classes:
G01C3/06; G06F3/041; G06F3/042
Foreign References:
| JP2012008114A | 2012-01-12 | |||
| JP2009258569A | 2009-11-05 | |||
| JPH06289135A | 1994-10-18 | |||
| JP2011095208A | 2011-05-12 |
Attorney, Agent or Firm:
SEIRYO I.P.C. (JP)
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