Fundus imaging system

An imaging system and imaging objective lens technology, applied in the field of optics, can solve problems such as uneven illumination, poor use effect, and small focus range

Pending Publication Date: 2020-10-27
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, the hand-held use effect is not good, and the image is not clear, the illumination is uneven, and the focus range is small.

Method used

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  • Fundus imaging system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment one: if figure 1 As shown, a fundus imaging system, from the object plane side to the image plane side includes:

[0035] The eyepiece group G1 with positive dioptric power, the imaging objective lens group G2 with positive dioptric power, the gaze assembly G3, the auxiliary assembly G4 and the sensor 30; when the eye is checked, the eyeball 10 is located on the left side of the eyepiece group G1.

[0036] The staring assembly G3 includes a dichroic prism 20 and a fixation lamp 21, and the dichroic prism 20 is arranged between the auxiliary assembly G4 and the imaging objective lens group G2, that is, the dichroic prism 20 can be arranged on the main optical axis of the fundus imaging system; The direction perpendicular to the optical axis of the fundus imaging system is arranged on the outside of the dichroic prism 20 . Specifically, in this embodiment, the fixation lamp 21 can be arranged on the lower side of the dichroic prism 20 .

[0037] When the eyeba...

Embodiment 2

[0058] Embodiment 2: a fundus imaging system. The difference between this embodiment and Embodiment 1 lies in the specific structure of the eyepiece group G1.

[0059] On the basis of Embodiment 1, in this embodiment, the eyepiece group G1 sequentially includes from the object plane side to the image plane side:

[0060] The first lens L1 with positive refractive power, the second lens L2 with positive refractive power and the third lens L3 with negative refractive power, the second lens L2 and the third lens L3 are cemented.

[0061] In this embodiment, the setting of the positive and negative structure reduces the effective aperture of the rear imaging objective lens group G2, the staring component G3 and the auxiliary component G4, and realizes the miniaturization of the fundus imaging system; meanwhile, the setting of the cemented lens greatly The chromatic aberration and astigmatism of imaging are improved, and the quality of imaging is increased.

[0062] Preferably, th...

Embodiment 3

[0069] Embodiment 3: A fundus imaging system, which includes in sequence from the object plane side to the image plane side:

[0070] Eyepiece group G1 with positive dioptric power, imaging objective lens group G2 with positive dioptric power, staring component G3, auxiliary component G4 and sensor 30.

[0071] The eyepiece group G1 includes a first lens L1 with positive power, a second lens L2 with positive power, and a third lens L3 with negative power; wherein, the second lens L2 and the third lens L3 are cemented.

[0072] The imaging objective lens group G2 includes a fourth lens L4 with positive power, a fifth lens L5 with positive power, a sixth lens L6 with negative power, and a seventh lens L7 with negative power, with positive power The eighth lens L8 with a positive refractive power, the ninth lens L9 with a positive refractive power, the tenth lens L10 with a positive refractive power, and the eleventh lens L11 with a negative refractive power; wherein, the fifth l...

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Abstract

The invention discloses a fundus imaging system, and relates to the technical field of optics. The fundus imaging system sequentially comprises an eye piece group with positive focal power, an imagingobjective lens group with positive focal power, a staring assembly, an auxiliary assembly and a sensor from an object plane side to an image plane side, wherein the staring assembly comprises a beamsplitting prism and a sight fixing lamp, the beam splitting prism is arranged between the auxiliary assembly and the imaging objective lens group, and the sight fixing lamp is arranged on the outer side of the beam splitting prism in the direction perpendicular to the optical axis of the fundus imaging system; the fundus imaging system meets the following conditional expression: 0.7<f1 / f2<1.3; 2<D / f1<3, wherein f1 is the focal length of the eye piece group, f2 is the focal length of the imaging objective lens group, and D is the distance between the eye piece group and the imaging objective lens group. By controlling the focal length ratio of the specific eye piece group to the imaging objective lens group, the amplification factor of the fundus imaging system is controlled, and the resolution ratio of the fundus imaging system is increased.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a fundus imaging system. Background technique [0002] Fundus photography is one of the commonly used inspection methods in ophthalmology. Fundus photography examines the morphological changes of the entire retina, and can observe the morphology of the retina, optic disc, macular area, retinal blood vessels, etc., which has a positive effect on the prevention and treatment of diabetes, glaucoma and other diseases. [0003] Fundus cameras currently on the market are divided into desktop and handheld; desktop is generally used by large hospitals because of its high price and large size; handheld is small and portable; it can be widely used in remote areas and households. But at present, the hand-held use effect is not good, and the image is not clear, the illumination is uneven, and the focus range is small. Contents of the invention [0004] The present invention solves the e...

Claims

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Application Information

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IPC IPC(8): A61B3/12A61B3/14G02B13/00G02B25/00
CPCA61B3/12G02B25/001G02B13/0015G02B13/006A61B3/14
Inventor 张云涛
Owner JIAXING ZHONGRUN OPTICAL TECH
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