| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical scanning type endoscope in which a scanning trajectory upon scanning of an observed object is stable and a signal can be detected thanks to an irradiation of laser light even from a central part of scanning the observed object.SOLUTION: The optical scanning type endoscope having a stationary section and an oscillation section comprises: a fiber that irradiates an observed object with laser light from a tip of the oscillation section; a driving section for oscillating and driving the oscillation section of the fiber; and a detection section that detects light obtained by the irradiation of the laser light from the observed object. The driving section oscillates the oscillation section of the fiber by a drive frequency, and deviates amplitude of an oscillation of the fiber by a modulation frequency between a substantial zero and a prescribed maximum value. The drive frequency is adapted so as to be a frequency higher than a frequency having the modulation frequency added to a high frequency side sub-resonant frequency (f) and lower than a prescribed upper-limit frequency (f), or lower than a frequency having the modulation frequency subtracted from a low frequency side sub-resonant frequency (f), and higher than a prescribed lower-limit frequency (f). |
