US 12,064,091 B2
Image system, endoscope system, light source device, and control method for light source device
Takayuki Sato, Tokyo (JP); Satoshi Tanaka, Tokyo (JP); and Masahiro Nishio, Tokyo (JP)
Assigned to OLYMPUS CORPORATION, Tokyo (JP)
Filed by OLYMPUS CORPORATION, Tokyo (JP)
Filed on Nov. 4, 2021, as Appl. No. 17/518,994.
Application 17/518,994 is a continuation of application No. PCT/JP2019/018601, filed on May 9, 2019.
Prior Publication US 2022/0057623 A1, Feb. 24, 2022
Int. Cl. A61B 1/06 (2006.01); G02B 23/24 (2006.01)
CPC A61B 1/0655 (2022.02) [A61B 1/0661 (2013.01); G02B 23/2461 (2013.01); G02B 23/2484 (2013.01); G02B 23/2492 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An imaging system comprising:
a light source configured to emit illumination light with which a subject is irradiated;
an image sensor in which pixels for generating electric signals by receiving light from the subject and performing photoelectric conversion on the received light are arranged two-dimensionally;
a reading circuit configured to sequentially read out the electrical signals from horizontal lines of the pixels in the image sensor on a horizontal-line basis during a reading period for each frame or each field period;
an optical sensor configured to measure an amount of the illumination light emitted by the light source; and
a lighting controller configured to control independently:
emission of the illumination light in a non-all-line exposure period, which contains the reading period for one frame or one field period and in which at least one horizontal line of the horizontal lines for the one frame or the one field period is not exposed to light, such that the amount of the illumination light is controlled by repeating turn-on and turn-off of a plurality of pulsed lights and adjusting at least one of a turn-on period and a turn-on frequency of each pulsed light, and
emission of the illumination light in an all-line exposure period, in which all of the horizontal lines for the one frame or the one field period are exposed to light, such that the amount of the illumination light is controlled while maintaining a state in which the illumination light is emitted over an entirety of the all-line exposure period.