Title:
LIGHT DETECTION DEVICE AND DISTANCE MEASURING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/168356
Kind Code:
A1
Abstract:
The present invention provides a light detection device that obtains a distance from a round-trip time of light, and reduces a distance measuring error while shortening dead time in a distance measuring system. A logic gate outputs an output signal on the basis of the result of a comparison of a prescribed threshold voltage and an input voltage corresponding to a voltage of a terminal of one of a cathode and an anode of an avalanche photodiode. A voltage limiting transistor limits the input voltage. In a fast-charging transistor, the thickness of a gate oxide film is less than that of the voltage limiting transistor, the fast-charging transistor supplying a charging voltage to the avalanche photodiode according to a prescribed pulse signal. A pulse generator generates a pulse signal on the basis of the output signal and supplies the pulse signal to the fast-charging transistor.
Inventors:
TSUKUDA YASUNORI (JP)
MORIKAWA YUKI (JP)
TOMITA KAZUTOSHI (JP)
MORIKAWA YUKI (JP)
TOMITA KAZUTOSHI (JP)
Application Number:
PCT/JP2021/031825
Publication Date:
August 11, 2022
Filing Date:
August 31, 2021
Export Citation:
Assignee:
SONY SEMICONDUCTOR SOLUTIONS CORP (JP)
International Classes:
G01S7/4861; H01L31/107; H01L31/10
Foreign References:
| JP2020148537A | 2020-09-17 | |||
| JP2018179732A | 2018-11-15 | |||
| JP2019075394A | 2019-05-16 |
Attorney, Agent or Firm:
MARUSHIMA, Toshikazu (JP)
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