Patent ID: 8110999
Filing Date: 2012-02-07
Classification: A61B

Abstract:
1. A light source apparatus comprising: a plurality of light source devices that are disposed in a form of a ring and that emit illumination light toward a central axis of the ring by being lit in a sequential pulsed fashion; a light-guide portion having a light entrance surface that is rotatably disposed on the central axis and on which the illumination light emitted from the light source devices is incident, and a reflecting surface that reflects the incident illumination light in the direction along the central axis; and a driving device that controls a pulsed-lighting phase range, which is a period during which the light source devices are lit according to a rotation phase of the light-guide portion; wherein by making a phase of a center of gravity of a light level related to a change of the light level of the illumination light emitted from the light-guide portion to become substantially a center of a maximum-pulse phase range when the light-guide portion is rotated under a condition where one of the light source device is made to emit light continuously, the driving device controls the pulsed-lighting phase range such that, when the pulsed-lighting phase range is shorter than the maximum-pulse phase range, which is a longest period during which the illumination light emitted from the light source devices is incident on the light entrance surface, a preceding light-out phase range and a succeeding light-out phase range, which are periods during which the light source devices are turned off, are provided before and after the pulsed-lighting phase range in the maximum-pulse phase range.