| 摘要 |
PURPOSE:To change light distribution angle in compliance with the angle of view of the lens through simple operation by providing a linear type discharge tube within the reflecting mirror of parabolic shape and providing a mechanism of relatively moving either one of the reflecting mirror or discharge tube in the optical axis direction. CONSTITUTION:When an operating knob 22 is moved to the right or left in compliance with the number 23 showing the focal length of the lens, an operating lever 21 turns about its axis 22A, hence a holder 15 slides in the optical axis direction according to the turning of the lever 21 of the pin 19 of a protruding piece 16, thereby changing the relative position of the reflecting mirror and discharge tube. Here, if the operating lever 21 is moved to the telephoto side, the discharge tube 2 retreats from a standard position and reflected light changes its direction to clockwise and becomes close to parallel to the optical axis 4, thus condensing as a whole. When the operating lever 21 is moved to the wide angle side, the discharge tube 2 advances forward from the standard position, and all the reflected light changes its direction to counterclockwise so that the light scatters more. In this way, the light distribution angle may be changed in compliance with the angle of view of the lens through the simple operation. |
