Quick turn beam splitter for single lens reflex camera

Abstract

Abstract PURPOSE:To improve the quality of a finder picture, by providing a reflective film having a low reflection factor even in the part where a metallic reflective film is not provided. CONSTITUTION:An optical image 1 on the optical axis of a focused luminous flux is incident to a sheet type beam splitter, and a part of this optical image is reflected, and another part is transmitted to become an optical image 2 and is incident to an optical splitting element 9 for focus detection. Since a light transmitting part has a reflection factor of about 30% in respect to a transmittance distribution 12 on a reflective face including the optical axis of a quick return mirror, the resolution of the overall 30% mirror and that of the sheet type mirror having reflection factor 70% are combined in the resolution in the (x) direction of a finder, and the resolution is improved because of the existence of the overall 30% mirror, and the sight of the finder is improved well.

Inventors

• 👤 Takashi Suzuki
• 👤 隆史 鈴木
• 👤 Susumu Ito
• 👤 進 伊藤

Bibliographic Details