公开(公告)号：US20230152573A1

公开(公告)日：2023-05-18

申请号：US17916821

申请日：2021-01-27

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Takayuki KURASHINA ,  Tomofumi SUZUKI ,  Tatsuya SUGIMOTO ,  Hiroo YAMAMOTO

IPC: G02B26/08 ,  B81B7/02

CPC classification number: G02B26/0841 ,  B81B7/02 ,  G02B26/10

Abstract: A MEMS actuator includes: a drive circuit for applying a drive voltage having a time waveform, which periodically repeats rising and falling and includes a period to be a constant voltage after the rising and before the falling, between a fixed comb electrode and a movable comb electrode; and a timing detection circuit that generates a capacitance derivative signal indicating a derivative value of a capacitance between the fixed comb electrode and the movable comb electrode by converting a current signal, which is output from the fixed comb electrode or the movable comb electrode within the period due to a change in the capacitance, into a voltage signal and detects a timing when the capacitance derivative signal reaches a threshold value. The drive circuit controls a relationship between the timing detected by the timing detection circuit and a timing of the falling to be constant.

公开(公告)号：US20200280694A1

公开(公告)日：2020-09-03

申请号：US16754239

申请日：2018-10-03

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Sho MORITA ,  Takayuki KURASHINA ,  Hiroo YAMAMOTO

IPC: H04N5/3745 ,  H03F3/45

Abstract: A pixel circuit includes a differential amplifier. The differential amplifier includes a non-inverting input terminal, an inverting input terminal, and an output terminal. The differential amplifier includes an input differential pair including first and second NMOS transistors, a current mirror pair including PMOS transistors, and a constant current source including a fifth NMOS transistor. A threshold voltage of each of the first and second NMOS transistors is higher than a threshold voltage of the fifth NMOS transistor. Further, the threshold voltage of each of the first and second NMOS transistors is higher than a threshold voltage of another NMOS transistor.