公开(公告)号：US10234610B2

公开(公告)日：2019-03-19

申请号：US15327089

申请日：2015-07-10

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Takafumi Seko ,  Masaomi Takasaka ,  Hiroshi Okamoto

IPC: G02B5/04 ,  G02B5/28 ,  G02B26/02 ,  G02B1/11 ,  G02B26/00 ,  G02B1/115

Abstract: An optical element includes an optical block through which object light is transmitted along a light transmission axis direction, a first wavelength selection filter provided on a first filter surface set such that a normal line forms an angle α with the light transmission axis, and a second wavelength selection filter located on a rear side with respect to the first wavelength selection filter, and provided on a second filter surface set such that a normal line forms an angle α with the light transmission axis, the second filter surface being in non-parallel, having an opposite inclination direction, and forming an angle 2α with the first filter surface. The optical block is constituted by combining an incidence-side block, a first filter block, a second filter block, and an emission-side block, formed of the same material and in the same shape.