Electronic endoscope
First Claim
Patent Images
1. An electronic endoscope comprising:
- illuminating means for radiating light toward an object, said illuminating means comprising;
a light source for generating said light,at least one infrared ray removing filter means having a first spectral transmittance for filtering light having a wavelength of 690 to 950 nm, andmeans for guiding said filtered light toward said object; and
image pickup means for imaging light reflected from said object, said image pickup means comprising;
objective lens unit means for focussing said light, andheat ray absorbing filter means having a second spectral transmittance for filtering light having a wavelength of 950 to 1100 nm so that, as a whole, said infrared ray removing filter means and said heat ray absorbing filter means remove infrared rays and YAG laser beams ranging in wavelength from 690 to 1100 nm.
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Abstract
An electronic endoscope using a solid-state image pickup device has a filter arranged in the foreground of the solid-state image pickup device within the body of the endoscope for removing lights having wavelengths not related to observation in order to effectively eliminate those light components which are not required for the observation from among those lights incident to the solid-state image pickup device. As such a filter, either a lens component constituting the objective lens or an illuminating lens can be used.
77 Citations
6 Claims
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1. An electronic endoscope comprising:
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illuminating means for radiating light toward an object, said illuminating means comprising; a light source for generating said light, at least one infrared ray removing filter means having a first spectral transmittance for filtering light having a wavelength of 690 to 950 nm, and means for guiding said filtered light toward said object; and image pickup means for imaging light reflected from said object, said image pickup means comprising; objective lens unit means for focussing said light, and heat ray absorbing filter means having a second spectral transmittance for filtering light having a wavelength of 950 to 1100 nm so that, as a whole, said infrared ray removing filter means and said heat ray absorbing filter means remove infrared rays and YAG laser beams ranging in wavelength from 690 to 1100 nm. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification