公开(公告)号：US09939535B2

公开(公告)日：2018-04-10

申请号：US15027765

申请日：2014-09-26

Applicant: WASEDA UNIVERSITY ,  HAMAMATSU PHOTONICS K.K.

Inventor： Jun Kataoka ,  Toru Nishiyama ,  Shinji Ohsuka ,  Michito Hirayanagi ,  Shunsuke Adachi ,  Tetsuya Uchiyama

IPC: G01T1/24 ,  G01T1/20

CPC classification number: G01T1/244 ,  G01T1/2018 ,  G01T1/2921

Abstract: A Compton camera includes a scattering detection unit, an absorption detection unit, a signal processing unit, a first shield unit, and a second shield unit. The scattering detection unit detects Compton scattering of incident radiation emitted from a radiation source. The absorption detection unit detects absorption of incident radiation that has undergone Compton scattering at the scattering detection unit. The signal processing unit obtains an image of the radiation source based on coincident detection events of Compton scattering of radiation at the scattering detection unit and absorption of radiation at the absorption detection unit. The first and second shield units are provided between the scattering detection unit and the absorption detection unit. The first shield unit selectively allows forward-scattered radiation to pass and selectively blocks back-scattered radiation.

公开(公告)号：US09989657B2

公开(公告)日：2018-06-05

申请号：US15335588

申请日：2016-10-27

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Shigeyuki Nakamura ,  Tsuyoshi Ohta ,  Michito Hirayanagi ,  Hiroki Suzuki ,  Shunsuke Adachi

IPC: G01T1/24 ,  G01T1/18 ,  H01L31/02

CPC classification number: G01T1/247 ,  G01T1/18 ,  H01L31/02027

Abstract: A readout circuit for reading out an output current from a photoelectric conversion element which collectively outputs currents generated in a plurality of pixels, each of which includes an avalanche photodiode, includes a current mirror circuit configured to receive the output current and output first and second currents having magnitudes in proportion to the output current, a photon counting circuit configured to count the number of photons incident on the photoelectric conversion element on the basis of the first current, an integral circuit configured to integrate the second current to generate a voltage signal, and a signal processing unit configured to determine a magnitude of light incident on the photoelectric conversion element on the basis of a counting result output from the photon counting circuit and a magnitude of the voltage signal output from the integral circuit.

公开(公告)号：US12021100B2

公开(公告)日：2024-06-25

申请号：US17258947

申请日：2019-06-06

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Shinya Iwashina ,  Shunsuke Adachi ,  Shigeyuki Nakamura ,  Terumasa Nagano ,  Ryutaro Tsuchiya

IPC: H04N25/766 ,  G01S7/497 ,  G01S17/89 ,  H01L27/146 ,  H01L31/107

CPC classification number: H01L27/14623 ,  H01L27/1463 ,  H01L27/14636 ,  H01L27/14643 ,  H01L27/14685 ,  H04N25/766 ,  G01S7/497 ,  G01S17/89 ,  H01L31/107

Abstract: Each of a plurality of cells includes at least one avalanche photodiode. A light projecting unit is arranged to project light having a cross-sectional shape whose longitudinal direction corresponds to a first direction. The light projecting unit is arranged to scan the light along a second direction intersecting the first direction such that the reflected light is incident on, among N cell groups each of which includes M cells aligned in a row direction, each cell group or each plurality of cell groups. A controller is arranged to apply, in accordance with the incidence of the reflected light, a bias voltage that makes the avalanche photodiode operate in a Geiger mode to each cell group or each plurality of cell groups, and is arranged to read signals from cells included in the cell group or the plurality of cell groups to which the bias voltage has been applied.

公开(公告)号：US11322635B2

公开(公告)日：2022-05-03

申请号：US16346929

申请日：2017-11-09

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Takashi Baba ,  Shunsuke Adachi ,  Shigeyuki Nakamura ,  Terumasa Nagano ,  Koei Yamamoto

IPC: H01L31/107 ,  H01L27/144 ,  H01L31/02 ,  G01J1/44

Abstract: A photodetecting device includes a semiconductor substrate including a one-dimensionally distributed plurality of pixels. The photodetecting device includes, for each pixel, a plurality of avalanche photodiodes arranged to operate in Geiger mode, a plurality of quenching resistors electrically connected in series with the respective avalanche photodiodes, and a signal processing unit arranged to process output signals from the plurality of avalanche photodiodes. Light receiving regions of the plurality of avalanche photodiodes are two-dimensionally distributed for each pixel. Each signal processing unit includes a gate grounded circuit and a current mirror circuit electrically connected to the gate grounded circuit. The gate grounded circuit is electrically connected to the plurality of avalanche photodiodes of the corresponding pixel via the plurality of quenching resistors. The current minor circuit is arranged to output a signal corresponding to output signals from the plurality of avalanche photodiodes.

公开(公告)号：US20240304644A1

公开(公告)日：2024-09-12

申请号：US18668750

申请日：2024-05-20

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Shinya IWASHINA ,  Shunsuke Adachi ,  Shigeyuki Nakamura ,  Terumasa Nagano ,  Ryutaro Tsuchiya

IPC: H01L27/146 ,  G01S7/497 ,  G01S17/89 ,  H01L31/107 ,  H04N25/766

CPC classification number: H01L27/14623 ,  H01L27/1463 ,  H01L27/14636 ,  H01L27/14643 ,  H01L27/14685 ,  H04N25/766 ,  G01S7/497 ,  G01S17/89 ,  H01L31/107

Abstract: Each of a plurality of cells includes at least one avalanche photodiode. A light projecting unit is arranged to project light having a cross-sectional shape whose longitudinal direction corresponds to a first direction. The light projecting unit is arranged to scan the light along a second direction intersecting the first direction such that the reflected light is incident on, among N cell groups each of which includes M cells aligned in a row direction, each cell group or each plurality of cell groups. A controller is arranged to apply, in accordance with the incidence of the reflected light, a bias voltage that makes the avalanche photodiode operate in a Geiger mode to each cell group or each plurality of cell groups, and is arranged to read signals from cells included in the cell group or the plurality of cell groups to which the bias voltage has been applied.

公开(公告)号：US11183608B2

公开(公告)日：2021-11-23

申请号：US16348187

申请日：2017-11-09

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Shigeyuki Nakamura ,  Shunsuke Adachi ,  Takashi Baba ,  Terumasa Nagano ,  Koei Yamamoto

IPC: H01L31/101 ,  H01L27/146 ,  H01L31/02 ,  H01L31/0256 ,  H04N5/378

Abstract: A photodetecting device includes a semiconductor photodetecting element including a plurality of pixels distributed two-dimensionally and a mount substrate including a plurality of signal processing units arranged to process output signals from the corresponding pixels. The semiconductor photodetecting element includes, for each of the pixels, a plurality of avalanche photodiodes arranged to operate in Geiger mode, a plurality of quenching resistors each electrically connected in series with a respective avalanche photodiodes, and a through-electrode electrically connected to the plurality of quenching resistors. Each of the signal processing units includes a current mirror circuit electrically connected to the plurality of avalanche photodiodes via the corresponding through-electrode and arranged to output a signal corresponding to output signals from the plurality of avalanche photodiodes. The number of signal processing units included on the mount substrate is more than the number of light receiving regions in each of the pixels.