| 摘要 |
PURPOSE:To prevent stray lights without using any visual field mask, by constituting plural images of a surface of reflection formed on a photoelectric conversion means by an image re-forming system in such a way that the images are not overlapped each other. CONSTITUTION:A luminous flux reflected by the surface of reflection 25d of an optical means 25 is made incident on a photoelectric conversion means 28 after passing through a surface of reflection 25e, prism sections 25f and 25g, and image re-forming lens 27. A diaphragm 26 has two openings and leads luminous fluxes passing through different parts of a photographing lens 1 to the lens 27. The diaphragm 26 then projects the luminous fluxes upon the means 28. On the other hand, the luminous flux passed through the optical means 25 is used for observation purpose after passing through a pentagonal prism 29 and eyepieces 30 and 31. Since the width A of the dimensions of the surface of reflection 25d is set in such a way that, when the image of the surface 25d is formed on the photoelectrically converting element row 28 by means of the image re-forming lens 27 in a plural number, the plural images are not overlapped each other, no luminous fluxes other than the one for detecting focal point are made incident on the photoelectric conversion element train, and, as a result, high focal point detecting accuracy is obtained. |
