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Fundus camera

一种照相机、眼睛的技术，应用在眼底镜、测试眼睛的设备、医药科学等方向，能够解决眼底图像失焦等问题

Inactive Publication Date: 2009-11-11
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the fundus image may be out of focus

Method used

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Embodiment Construction

[0030] Various exemplary embodiments, features, and aspects of the invention are described in detail below with reference to the accompanying drawings.

[0031] figure 1 The configuration of the fundus camera according to the first exemplary embodiment of the present invention is shown. The illumination optical system is constructed on the optical axes O1 and O2. Arranged on the optical axis O1 are: an observation light source 1 such as a halogen lamp configured to emit steady-state light; a condenser lens 2; an optical filter 3 configured to transmit infrared light and block visible light; a photographing light source 4 , such as flash unit, etc.; lens 5; and mirror 6. On the optical axis O2 extending from the mirror 6 in the reflection direction, an annular aperture 7 with an annular opening, a focusing target projection unit 8, a relay lens 9, and a perforated mirror 10 with a central opening are sequentially arranged.

[0032] The objective lens 11 facing the subject's ...

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PUM

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Abstract

A fundus camera includes a fundus photographing optical system including an image-recording image sensor for photographing a fundus image via a focusing lens, a focus target having a plurality of regions for forming light fluxes passing through a plurality of different areas on pupil of a subject's eye, and a focus drive unit for driving the focusing lens based on positions of a plurality of images of the focus target in an image captured by the image-recording image sensor and on contrast of the images.

Description

technical field [0001] The present invention relates to a fundus camera for photographing a fundus of a subject's eye in an eye hospital or the like. Background technique [0002] Hitherto, there has been known a fundus camera including: a projection unit for projecting a focus-separated target beam split on the pupil of the subject's eye onto the fundus of the subject's eye; An observation / imaging unit equipped with a focusing lens that images the fundus of the subject's eye. The two units move in lock with each other in the direction of the optical axis. The operator can easily adjust the focus split target image by observing the focus split target image formed on the fundus of the subject's eye and making the focus split target image a predetermined positional relationship, that is, arranging the focus split target image in a straight line. Focusing of the fundus camera. In addition, there is known an apparatus that realizes automatic focusing by capturing a focus-sepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/14A61B3/12
CPCA61B3/14A61B3/12
Inventor 岸田伸义岩永知行大番英之田中信也
Owner CANON KK