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Fundus photography device

A technology of fundus photography and photography device, which is applied in photography, ophthalmoscope, equipment for testing eyes, etc., and can solve problems such as loss of photography light, reduction of photography accuracy, and complex structure

Inactive Publication Date: 2003-04-23
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For this reason, since the loss of photographic light quantity occurs, it is necessary to provide a mechanism for inserting and detaching optical components, so the structure is complicated.
[0005] In addition, it takes time until the actual image is taken after the switch is pressed, and there is a problem that the accuracy of the image is lowered.

Method used

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  • Fundus photography device
  • Fundus photography device
  • Fundus photography device

Examples

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Embodiment Construction

[0014] The present invention will be described in detail based on the illustrated embodiments.

[0015] figure 1 The structure diagram of the fundus camera in the present embodiment is shown. An objective lens 1 is arranged in front of the eye E to be inspected. Behind the objective lens 1 as a fundus photography system, an aperture mirror 2 is arranged. The photographic aperture 2a in the hole, the focus lens 3 that can move along the optical axis, the photographic lens 4, the infrared fluorescence blocking filter 5 that can be inserted and detached freely in the optical path to block the excitation light and only pass through the fluorescence, and the photographic element 6.

[0016] In the fundus lighting system of the incident direction of the aperture reflector 2, the relay lens 7 is arranged sequentially from the aperture reflector 2 side, and the infrared light blocking filter 8, which is free to be inserted and removed in the optical path, and the infrared fluorescence...

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PUM

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Abstract

A fundus image-taking and recording apparatus emits an appropriate amount of light at the time of taking an image by determining an appropriate light exposure from the amount of observation light during observation. In particular, even when the brightness varies during fluorescence image-taking, the fundus image-taking apparatus can provide an image having adequate brightness by measuring the sensitivity of a television camera for observation to thereby determine an appropriate amount of image-taking light.

Description

technical field [0001] The present invention relates to a fundus imaging device used in fundus hospitals and the like. Background technique [0002] In the past, for example, in the fundus imaging device of Japanese Patent No. 2801318, in order to automatically obtain an appropriate exposure, the fundus reflectance was obtained from the amount of illumination light from the fundus and the amount of reflected light from the fundus. to adjust the auto exposure. [0003] However, in the conventional example described above, it is necessary to install a light beam extraction optical component in the optical path of the illumination optical system and the imaging light source system. [0004] For this reason, since a loss of imaging light quantity occurs, it is necessary to provide an insertion and removal mechanism for optical components, and thus the structure is complicated. [0005] In addition, it takes time until the actual imaging is performed after the switch is pressed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/12A61B3/14G03B7/16G03B15/05H04N23/75
CPCA61B3/145A61B3/12
Inventor 松本和浩
Owner CANON KK