| 摘要 |
<p>A novel otoscope for coaxially illuminating and viewing the interior of an ear having in combination a housing with an eyepiece at one end and a specula at the opposite end, a thick lens prism mounted between the eyepiece and the speculum, the thick lens prism functioning as a bi-convex thick lens to image the light in the region of view with a first spherical convex lens, along a light source axis directing the light from a bulb toward an internal reflecting surface of the prism at an angle of incidence greater than the critical angle to reflect the light along the optical viewing axis through the second spherical convex lens of the prism to image the light in the viewed region.</p> |
