| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic endoscope system capable of obtaining sufficiently bright images without affecting observation with special light even when the system is in a distant view observation condition in which light quantity is short. SOLUTION: In a close view observation mode, image pickup is executed by irradiating a body cavity with a first blue narrow band light Bn1. An exposure quantity is detected from image pickup signals obtained by the image pickup. If the exposure quantity is less than a predetermined value, switching is made from the close view observation mode to a distant view observation mode. In the distant view observation mode, the image pickup is executed by irradiating the body cavity with a second blue narrow band light Bn2 obtained by increasing only the light quantity of a short wavelength without increasing the light quantity of a long wavelength from a central wavelength in the first blue narrow band light. As described above, since the second blue narrow band light Bn2 has a half value width wider than that of the first blue narrow band light Bn1, light quantity shortage in the distant view observation can be solved without affecting special light observation. COPYRIGHT: (C)2012,JPO&INPIT |
