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Portable retinal imager

A technology of retina and imager, which is applied in the field of medical optical instruments and biometrics, can solve the problems of small camera detection field of view, complex structure of camera imaging optical path and positioning optical path, and achieve the effect of large detection field of view

Inactive Publication Date: 2014-06-18
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a portable retinal imager to solve the problem that the front end of the existing fundus camera adopts the structure of the retinal objective lens, which leads to complex structures of the imaging optical path and positioning optical path of the camera, or does not adopt the structure of the retinal objective lens, resulting in a small detection field of view of the camera.

Method used

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specific Embodiment approach 1

[0017] Specific implementation mode one, combined Figure 1 to Figure 4 Description of this embodiment, the portable retinal imager, the working distance positioning optical path includes: retinal objective lens, switching mirror group 2, hollow mirror 3, relay mirror 4, reflector 5, relay mirror 6, near-infrared light detector 7 . The retinal objective lens includes two parts of lens groups: the retinal objective lens fixed group 1-1 and the retinal objective lens zoom group 1-2. There is a larger distance between the retinal objective lens fixed group 1-1 and the retinal objective lens zoom group 1-2, which is used for inserting the switching lens group 2. The light signal sent by the iris passes through the retina objective lens, switching mirror group 2, hollow mirror 3, relay mirror 4, reflector 5 and relay mirror 6 in turn, and is received by the near-infrared light detector 7. Only when the distance between the iris and the camera is the designed value, the iris image...

specific Embodiment approach 2

[0021] Specific embodiment two, combine figure 1 and Figure 5 Describe this embodiment mode, this embodiment mode is the embodiment of the portable retinal imager described in specific embodiment one: wherein the retina objective lens fixed group 1-1 comprises two lenses, the left surface of the first lens 1-1-1 and The right surface, the left surface and the right surface of the second lens 1-1-2 respectively correspond to different optical parameters, and the left surface and the right surface of the lenses of the retinal objective lens zoom group 1-2 correspond to different optical parameters respectively. Table 1 shows the lens optical parameters of the retina objective lens.

[0022] Table 1

[0023]

[0024]

[0025] The specific working process of the retinal imager described in this embodiment is divided into three steps:

[0026] The first step is working distance positioning; the second step is focus positioning, and the third step is retinal photography. ...

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Abstract

The invention discloses a portable retinal imager and relates to the field of medical optical instruments and biometric identification. The invention solves the problem that an imaging light path and a positioning light path of a camera have complicated structures because a retinal objective structure is adopted at the front end of the conventional fundus camera, or the camera has a small detective field-of-view angle because the retinal objective structure is not adopted. A retinal objective has a zooming structure and consists of a retinal objective fixation group and a retinal objective zooming group. The distance between the retinal objective fixation group and the retinal objective zooming group is relatively large, so a switching lens group can be inserted when the working distance is positioned. The system is a centered optical system, and the retinal objective zooming group can adjust an imaging light path and a focusing positioning light path while moving, so the synergistic zooming of the two light paths can be realized without a complicated mechanical structure; and an aspheric surface is adopted for the retinal objective zooming group when the retinal objective zooming group is designed, so that the requirements of aberration correction of the two light paths are simultaneously met, the clear projection of a reticle of the focusing positioning light path on a retina is ensured, and a clear image of the retina on a detector can also be ensured.

Description

technical field [0001] The invention relates to the fields of medical optical instruments and biometric identification, in particular to a portable retinal imaging optical system applied to medical detection or identification. Background technique [0002] Retinal imaging technology is gradually being widely used in fields such as medical treatment and biometric identification. In medicine, timely detection and tracking of retinopathy can play an effective role in diagnosis and early warning of various diseases. In the field of biometrics, the retina has far more biological characteristics than fingerprints and palmprints, which can greatly improve the recognition accuracy; moreover, the retina penetrates into the fundus of the eye and is not easy to be obtained by the outside world, so it has a very high level of confidentiality. The retinal imager consists of three necessary components: imaging light path, illumination light path and positioning light path. The imaging li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/14A61B3/12
Inventor 李淳贾苏娟孙强
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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