Patent ID: 11971301
Assignee: HAMAMATSU PHOTONICS K.K.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 23:
24. A spectroscopic unit comprising:
a housing;
a light incident portion provided to the housing; and
a Fabry-Perot interference filter arranged in the housing and having a first mirror and a second mirror, a distance between the first mirror and the second mirror being variable,
wherein the light incident portion has
an aperture portion in which an aperture is formed, and
a band pass filter arranged between the aperture and the Fabry-Perot interference filter, and
the aperture portion is configured so that a value obtained by dividing a length of the aperture in a facing direction of the first mirror and the second mirror by a width of the aperture in a direction perpendicular to the facing direction is equal to or more than 0.5.