BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to an imaging device, an imaging system, and a moving body.

Description of the Related Art

Japanese Patent Application Laid-Open No. 2014-165733 discusses an imaging device that includes an analog-to-digital (AD) conversion unit that performs AD conversion of a signal of a photoelectric conversion unit. In this imaging device, the AD conversion units are arranged in a plurality of rows and a plurality of columns.

In the imaging device discussed in Japanese Patent Application Laid-Open No. 2014-165733, the AD conversion units in one column are connected to one vertical bus. This vertical bus is connected to a signal holding unit provided corresponding to each column. Digital signals are sequentially transmitted from the signal holding unit of each column to an output unit.

SUMMARY OF THE INVENTION

According to an aspect of the present invention, an imaging device includes a plurality of photoelectric conversion units arranged in a plurality of rows and a plurality of columns, a memory area in which a plurality of first bit memories is arranged in a plurality of rows and a plurality of columns, the first bit memories each holding a digital signal of one bit, and the one bit being one of different bits of a digital signal that is formed of a plurality of bits and generated by analog-to-digital (AD) conversion of a signal based on a signal generated by the corresponding photoelectric conversion unit among the plurality of photoelectric conversion units, a first transmission line disposed to correspond to a plurality of first bit memories in one column of the plurality of columns, and extending from the memory area to outside the memory area, the first transmission line being connected to the plurality of first bit memories in the one column, a plurality of second bit memories disposed outside the memory area, and connected to the first transmission line, the second bit memories each being configured to hold the digital signal of one bit that is one of different bits among the plurality of bits, a second transmission line connected to a part of the plurality of second bit memories, and a third transmission line connected to another part of the plurality of second bit memories.

Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings.

