Ocular optical system and binoculars

眼視光学系及び双眼鏡

Abstract

(57)【要約】 【課題】ポロタイプの像反転光学系を備えているにも拘 わらず、広い実視界を実現する眼視光学系を、提供す る。 【解決手段】一対の眼視光学系1、2は、第1反射面3 a,4a及び第2反射面3b,4bが形成された直角プ リズムからなる第1像反転光学系3,4と,第3反射面 7a,8a及び第4反射面7b,8bが形成された直角 プリズムからなる第2像反転光学系7,8とを有すると ともに、第1像反転光学系3,4の両反射面の延長面の 交線と第2像反転光学系3,4,7,8の両反射面の延 長面の交線とがねじれの位置に配置(ポロI型)され、 各第2反射面3b,4bが同一平面内において隣接して いる。第2反射面3b,4bと第3反射面7a,8aと の間に配置される対物光学系7a、7bが結んだ実像 は、第4反射面5b,6bの後ろに配置される接眼光学 系8a,8bによって拡大観察される。
PROBLEM TO BE SOLVED: To provide an ocular optical system realizing a wide actual visual range in spite of its being provided with a Porro type image inversion optical system. SOLUTION: A pair of ocular optical systems 1 and 2 is provided with the 1st image inversion optical systems 3 and 4 consisting of rectangular prisms obtained by forming 1st reflection surfaces 3a and 4a and 2nd reflection surfaces 3b and 4b and the 2nd image inversion optical systems 7 and 8 consisting of rectangular prisms obtained by forming 3rd reflection surfaces 7a and 8a and 4th reflection surfaces 7b and 8b. Then, the cross line of the extension surfaces of both reflection surfaces of the optical systems 3 and 4 and the cross line of the extension surfaces of both reflection surfaces of the optical systems 7 and 8 are arranged at a position where they are distorted (Porro I type) and the respective reflection surfaces 3b and 4b are adjacent within an identical plane surface. Then, a real image formed by objective optical systems 7a and 7b arranged between the 2nd reflection surfaces 3b and 4b and the 3rd reflection surfaces 7a and 8a is enlarged and observed through eyepiece optical systems 8a and 8b arranged behind the 4th reflection surfaces 7b and 7b.

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