| 摘要 |
PURPOSE: To increase the quantity of light incident on a light measuring means extensively without reducing the quantity of light incident on an image pick-up element, by leading the first light flux and the second light flux reflected by an image pick-up means and a reflecting means to the light measuring means. CONSTITUTION: The light flux A of a subject image is divided into a light flux B toward an image pick-up element 19 and a light flux C toward a total reflecting mirror 21 by a beam splitter 15, and thereafter, a light flux D and a light flux F reflected by the element 19 and the total reflecting mirror 21 are led to a light measuring element 25. As a result, the quantity of light incident to the element 19 is not reduced, and the quantity of light incident to the light measuring element 25 can be increased extensively. In other words, since both the reflecting light of the beam splitter 15 and the reflecting light of the element 19 are injected to the light measuring element 25, a light flux of the incident light quantity larger than the conventional system is to be injected to the light measuring means 25, and as a result, the output of the light measuring element 25 is increased, and the influence by a disturbance such as a noise is hardly received. |
