DISTANCE IMAGE PICKUP DEVICE AND DISTANCE IMAGE PICKUP METHOD

Japanese Patent JP2023037863

A

To provide a distance image pickup device which prevents such a state that electric charges are accumulated only in any of two electric charge storage parts even when a waveform of an optical pulse becomes blunt and the pulse width is deformed to be short, and reduces an error between a distance obtained from a ratio of the electric charge amounts of the electric charge storage parts and an actual distance.SOLUTION: A distance image pickup device comprises: a light source unit which emits an optical pulse; a light reception unit which includes a photoelectric conversion element that generates an electric charge according to the incident light, a plurality of pixel circuits that have electric charge storage parts for accumulating the electric charges and a pixel drive circuit that distributes the electric charges generated by the photoelectric conversion element via a transfer transistor to the electric charge storage parts at timing in synchronization with the optical pulse; and a distance calculation unit which calculates a distance between a subject and the light reception unit from an electric charge ratio of the electric charge amounts generated by reflection light, distributed via the transfer transistor from the photoelectric conversion element and accumulated in the electric charge storage parts. The width of the optical pulse is set to be long in comparison to a period of the rise of the specific transfer transistor and the rise of the transfer transistor that rises the next in the transfer transistors.SELECTED DRAWING: Figure 1

HATAKEYAMA KUNIHIRO
HARIO HIROMITSU

JP2021144666A

March 16, 2023

September 06, 2021

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TOPPAN PRINTING CO LTD

G01S7/4863; G01C3/06; G01S17/894

Yasushi Matsunuma
Shiro Suzuki
Yuichiro Shimizu
Makiko Otsuki

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