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    • 5. 发明公开
    • Focusing unit and ophthalmic photographing apparatus
    • Fokussierungseinheit und eyemischer Fotoapparat
    • EP1929935A1
    • 2008-06-11
    • EP07121928.1
    • 2007-11-29
    • Canon Kabushiki Kaisha
    • Tanaka, ShinyaIwanaga, TomoyukiItoh, Hiroshi
    • A61B3/12A61B3/14
    • A61B3/14
    • A focusing unit (16) can be inserted into and removed from an illumination light path by rotating around a supporting portion (16c). An index light source (15), a green LED, is attached to the bottom of a base (16a). A transparent acrylic-resin disk (16b) is fixed to the base. A deflection prism (13) is attached to the bottom of the disk. A beam from the light source enters the deflection prism. A focus index forming portion (14) is provided on the top of the disk. In the center of a light-shielding portion (14a) is formed a slit-like opening (14b), under which split prisms (14c, 14d) are provided. Deflected by the prisms, the beam from the light source is split into two, right-half and left-half, directional beams, and combined with an illumination optical system, in the form of two slit images, at the opening.
    • 聚焦单元(16)可以通过围绕支撑部分(16c)旋转而插入照明光路中并从照明光路中移除。 索引光源(15),绿色LED连接到基座(16a)的底部。 透明的丙烯酸树脂盘(16b)固定在基座上。 偏转棱镜(13)附接到盘的底部。 来自光源的光束进入偏转棱镜。 焦点指标形成部分(14)设置在盘的顶部。 在遮光部(14a)的中心形成有狭缝状的开口(14b),在该狭缝状的开口部(14b)上设有分割棱镜(14c,14d)。 由棱镜偏转,来自光源的光束被分成两个,右半部分和左半部分的定向光束,并且在开口处与两个狭缝图像的形式的照明光学系统组合。
    • 7. 发明公开
    • Fundus camera
    • Funduskamera
    • EP2111785A1
    • 2009-10-28
    • EP09158077.9
    • 2009-04-16
    • Canon Kabushiki Kaisha
    • Itoh, HiroshiTanaka, ShinyaTakai, Motoya
    • A61B3/12A61B3/14
    • A61B3/14
    • A fundus camera includes an optical path splitting unit arranged between a focusing unit and an imaging unit. The optical path splitting unit has characteristics adapted to reflect light of a visible light region and to transmit near-infrared light. The optical path splitting unit retreats from an optical path when a still fundus image is photographed. A quick-return mirror having such characteristics is used as the optical path splitting unit. When near-infrared illumination light having a wavelength of about 850 nm is used, such light can be incident upon the imaging unit without loss of the amount of light. In addition, visible light output from an internal fixation target is projected onto a subject's eye. Further, a cornea diaphragm and a crystalline lens diaphragm are used for observing a fundus with invisible light. Each of the cornea diaphragm and the crystalline lens diaphragm can be changed to another one having a different diameter.
    • 眼底照相机包括布置在聚焦单元和成像单元之间的光路分离单元。 光路分离单元具有适于反射可见光区域的光并透射近红外光的特性。 当拍摄静止眼底图像时,光路分离单元从光路退回。 具有这种特性的快速返回镜被用作光路分离单元。 当使用具有约850nm波长的近红外照明光时,这种光可以入射到成像单元上而不损失光量。 此外,从内部固定目标输出的可见光被投射到被检者的眼睛上。 此外,角膜隔膜和晶状体膜片用于用不可见光观察眼底。 每个角膜片和晶状体镜片可以改变为具有不同直径的另一个。