发明名称 |
Image pickup apparatus |
摘要 |
An image pickup apparatus includes a pixel generating a signal by photoelectric conversion, a comparator comparing the signal based on the pixel with a reference signal varied with time, a counter performing counting until the comparator outputs a signal indicating that a relationship in magnitude between the signal based on the pixel and the reference signal is reversed, and a control unit. The comparator includes a first amplifier receiving the reference signal at a first input portion and the signal based on the pixel at a second input portion to compare the signal based on the pixel with the reference signal. The control unit sets a bandwidth of the comparator to a first bandwidth when the reference signal varies at a first rate of change and to a second bandwidth when the reference signal varies at a second rate of change. |
申请公布号 |
US9094629(B2) |
申请公布日期 |
2015.07.28 |
申请号 |
US201213562152 |
申请日期 |
2012.07.30 |
申请人 |
Canon Kabushiki Kaisha |
发明人 |
Ishibashi Koji |
分类号 |
H04N5/335;H04N5/378;H03M1/00;H03M1/56 |
主分类号 |
H04N5/335 |
代理机构 |
Canon U.S.A., Inc. IP Division |
代理人 |
Canon U.S.A., Inc. IP Division |
主权项 |
1. An image pickup apparatus comprising:
a pixel configured to generate a signal by photoelectric conversion; a comparator configured to compare the signal based on the pixel with a reference signal varied with time; a counter configured to perform counting until the comparator outputs a signal indicating that a relationship in magnitude between the signal based on the pixel and the reference signal is reversed; and a control unit, wherein the comparator includes a first amplifier that receives the reference signal at a first input portion and the signal based on the pixel at a second input portion to compare the signal based on the pixel with the reference signal, and wherein the control unit sets a bandwidth of the comparator to a first bandwidth when the reference signal varies with time at a first rate of change and sets the bandwidth of the comparator to a second bandwidth broader than the first bandwidth when the reference signal varies with time at a second rate of change smaller than the first rate of change. |
地址 |
Tokyo JP |