Title:
LIGHT FLIGHT TYPE RANGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/025749
Kind Code:
A1
Abstract:
A digital signal processing circuit 11 measures a distance in accordance with a plurality of modulation frequencies including a first modulation frequency f1 and a second modulation frequency f2 which is lower than the first modulation frequency f1. The digital signal processing circuit 11 is configured in such a way that, when measuring the distance in accordance with the first modulation frequency f1, a storage capacitor of a light receiving element 6 accumulates/discharges charge in accordance with a timing at which a phase polarity is controlled by means of a light emission control circuit 3 for each sub-sequence, and the distance is measured in accordance with the charge accumulated in the storage capacitor. Furthermore, the digital signal processing circuit 11 corrects the distance measurement result on the basis of the measurement result obtained using the first modulation frequency f1 and the measurement result obtained using the second modulation frequency f2.
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Inventors:
NAGAI TOSHIAKI (JP)
Application Number:
PCT/JP2017/027287
Publication Date:
February 08, 2018
Filing Date:
July 27, 2017
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
G01S17/894; G01C3/06; G01S7/483; G01S7/4863; G01S7/4865; G01S7/4915; G01S17/10
Domestic Patent References:
WO2010098454A1 | 2010-09-02 |
Foreign References:
JP2013076645A | 2013-04-25 | |||
US20150204970A1 | 2015-07-23 | |||
US20140362364A1 | 2014-12-11 |
Attorney, Agent or Firm:
SATO INTERNATIONAL PATENT FIRM (JP)
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