发明授权
- 专利标题： Eyepiece optical system for a single lens reflex camera
- 专利标题（中）： 用于单镜头反光相机的目镜光学系统
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申请号： US09407995申请日： 1999-09-29
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公开(公告)号： US06263168B1公开(公告)日： 2001-07-17
- 发明人: Sachio Hasushita , Hiroyasu Ozaki
- 申请人： Sachio Hasushita , Hiroyasu Ozaki
- 优先权： JP10-278541 19980930; JP11-158222 19990604
- 主分类号： G03B1306
- IPC分类号： G03B1306
摘要：
An eyepiece optical system, which is used in a single lens reflex camera having a penta mirror, includes a negative first single lens element, a positive second single lens element, and a negative third single lens element, in this order from the penta mirror; wherein the second single lens element is a diopter adjusting lens element which is adjustable along the optical axis; and the following conditions are satisfied: −2
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