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3 September 2015 "Perfect Zoom System" which enables both a zoom ratio of 25:1 and a high-resolution in stereo microscope
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A stereomicroscope can stereoscopically observe an object with protrusions and recesses as if the object were viewed by both eyes. Such stereomicroscopes use an optical system to create two slightly different viewing angles of an object. The different images are both enlarged and viewed through two eyepieces. Each of the observation optical systems includes a variable magnification mechanism which is called a zoom lens system. In recent years, a demand for stereomicroscopes that can observe a wide variable magnification range has been increasing along with the diversification of applications. However, there are no stereomicroscope zoom lenses with both a high resolution and a large zoom ratio. We developed the “Perfect Zoom System” which can reduce the light flux diameter going through the objective lens in the low-power state. In the “Perfect Zoom System”, the zoom lens groups move along not only the optical axes but also perpendicular to the axes. Therefore, the objective lens could be made smaller by decentering the G2 and G3 group lenses in zoom lens group. We achieved a high resolution and a zoom ratio of 25:1.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Norio Miyake, Masahiro Mizuta, Nobuhiro Shinada, Hiroaki Nakayama, and Yumiko Ohuchi ""Perfect Zoom System" which enables both a zoom ratio of 25:1 and a high-resolution in stereo microscope", Proc. SPIE 9580, Zoom Lenses V, 958003 (3 September 2015);


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