| 摘要 |
PURPOSE:To improve an S/N ratio, by reducing the video signal level of an ITV camera by vibrating a reflective mirror for allowing the image of a body to be examined to be incident to the ITV camera. CONSTITUTION:When a reflective mirror 3 is fixed to the vibration plate 34 of a cone speaker 33 and the mirror surface 31 thereof is vibrated to a longitudinal direction, the optical axis reaching the picture element surface of a solid image pick-up device 22 is vibrated in an up-and-down direction between the solid line arrow position (the position of a light receiving element 23) and a dotted line arrow position (the position of a charge transfer element 24). Therefore, because the image forming light receiving time of the row of the elements 23 is reduced by about 1/2, the video signal thereof comes to one almost cut from the small spot like fluorescence of a healthy part generating background noise at an examination surface. |
