US 12,235,427 B2
Observation apparatus
Shinichi Hayashi, Tokyo (JP)
Assigned to Evident Corporation, Nagano (JP)
Filed by Evident Corporation, Tatsuno-machi (JP)
Filed on Dec. 6, 2021, as Appl. No. 17/542,602.
Application 17/542,602 is a continuation of application No. PCT/JP2020/022636, filed on Jun. 9, 2020.
Claims priority of application No. 2019-107620 (JP), filed on Jun. 10, 2019.
Prior Publication US 2022/0091402 A1, Mar. 24, 2022
Int. Cl. G02B 21/00 (2006.01); G02B 21/06 (2006.01); G02B 21/36 (2006.01)
CPC G02B 21/0032 (2013.01) [G02B 21/0064 (2013.01); G02B 21/06 (2013.01); G02B 21/365 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An observation apparatus comprising:
a first intensity modulation section arranged on an optical path of illumination light with which an observation object is to be irradiated, the first intensity modulation section modulating an intensity distribution of the illumination light; and
a second intensity modulation section arranged on an optical path of observation light from the observation object irradiated with the illumination light, the second intensity modulation section modulating an intensity distribution of the observation light,
wherein:
a first light utilization ratio distribution of the first intensity modulation section monotonously decreases in a first orientation, such that a differential value of the first light utilization ratio distribution corresponding to the first orientation is zero or a negative value at any position of the first light utilization ratio distribution, and a minimum value of the differential value along the first light utilization ratio distribution is non-zero, and
a second light utilization ratio distribution of the second intensity modulation section monotonously increases in a second orientation corresponding to the first orientation, such that a differential value of the second light utilization ratio distribution corresponding to the second orientation is zero or a positive value at any position of the second light utilization ratio distribution, and a maximum value of the differential value along the second light utilization ratio distribution is non-zero.