| 摘要 |
A light source apparatus for endoscopes is provided which automatically controls an illuminating source used in an endoscope for photography. The apparatus comprises an optical system for directing the flux of illuminating rays from a source lamp to a bundle of optical fibres which is used to transmit illuminating light through the endoscope, including a lamp current control circuit for establishing an input current to the lamp at a maximum, a minimum or any other intermediate value, a first switch synchronized with the initiation of the exposure of a photographic film for switching the input current to the lamp to its maximum value and for commencing the calculation of the amount of exposure given to the film to produce an exposure stop signal when a given amount of exposure is reached, and a second switch responsive to the exposure stop signal to switch the input current to the lamp from the maximum to the minimum value and for terminating the exposure by bringing a light shield member into the path of illuminating light. The apparatus is adapted for use with any one of three distinct types of endoscopes.
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