US 10,376,136 B2
Camera head for endoscope and endoscope apparatus having the same
Takayuki Kato, Hachioji (JP); Makoto Tomioka, Hachioji (JP); Takahiro Inoue, Hachioji (JP); and Kazuo Morita, Hachioji (JP)
Assigned to OLYMPUS CORPORATION, Tokyo (JP)
Filed by OLYMPUS CORPORATION, Hachioji-shi, Tokyo (JP)
Filed on Aug. 29, 2017, as Appl. No. 15/690,056.
Application 15/690,056 is a continuation of application No. PCT/JP2016/069627, filed on Jul. 1, 2016.
Claims priority of application No. 2015-151136 (JP), filed on Jul. 30, 2015.
Prior Publication US 2017/0354321 A1, Dec. 14, 2017
Int. Cl. A61B 1/00 (2006.01); A61B 1/04 (2006.01); A61B 1/05 (2006.01); A61B 1/045 (2006.01); A61B 1/055 (2006.01)
CPC A61B 1/051 (2013.01) [A61B 1/00096 (2013.01); A61B 1/00186 (2013.01); A61B 1/043 (2013.01); A61B 1/055 (2013.01); A61B 1/00165 (2013.01); A61B 1/00188 (2013.01); A61B 1/042 (2013.01); A61B 1/045 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A camera head connectable to an endoscope, the camera head comprising:
a camera-head optical system which includes a spectral prism having a dichroic film, the spectral prism splitting light from the endoscope into white light and fluorescent light; and
a first image pickup element and a second image pickup element which are disposed in respective optical paths split by the spectral prism,
wherein:
the first image pickup element is used for a white-light image observation in which a white-light image is captured, and the second image pickup element is used for a fluorescent-image observation in which two fluorescent images of different wavelengths are captured,
the first image pickup element is disposed at a position at which an image is formed in an optical path for the white-light image observation,
the second image pickup element is disposed at a position between two positions at which the two fluorescent images are formed in an optical path for the fluorescent-image observation, and
the camera head satisfies the following conditional expression (1)
d≤P×Fno  (1)
where,
d is nonzero and denotes a difference between (i) an optical-path length from the dichroic film up to the first image pickup element for the white-light image observation and (ii) an optical-path length from the dichroic film up to the second image pickup element for the fluorescent-image observation,
P denotes a pitch between pixels of each of the first image pickup element and the second image pickup element, and
Fno denotes an F-number for the camera-head optical system.