| 摘要 |
PURPOSE: To reduce a space between an image pickup optical system and an image pickup device to the utmost and to lead a light to a photometry element without provision of a special mechanism. CONSTITUTION: An image of an incident luminous flux is formed to a light receiving face of an image pickup device 31 through lenses 11, 12 of an image pickup optical system. A photometry element 32 is provided at a position not on an optical axis P of the image pickup optical system, the luminous flux is reflected in a mirror face 21 of a spectroscope member 20 and led to the photometry element 32. An aperture 13 is used to adjust an opening of the aperture to adjust the luminous quantity passing through the image pickup optical system. An aperture drive mechanism 40 to adjust the opening of the aperture 13 is provided with a main drive plate 43 having a guide hole 47. A pin 24 of the spectroscope member 20 is engaged to the guide hole 47. The pin 24 is turned around a support shaft 22 while being guided by the guide hole 47 attended with the turning of the main drive plate 43 so as to turn the spectroscope member 20, which is retreated from the inside of the optical path of the image pickup optical system. |
