Handheld fundus camera based on liquid lens

Abstract

The invention relates to a handheld fundus camera based on a liquid lens. The handheld fundus camera based on the liquid lens comprises a shell, and a lighting source, an image sensor, a first lens component, a second lens component, the liquid lens, a driving circuit, a signal processing unit, a control component and a power supply component are arranged inside the shell; the signal processing unit is used for controlling the working state of the lighting source, further receiving and processing a digital signal collected by the image sensor to obtain the evaluation index of the definition of an image, and sending a control signal according to the evaluation index of the definition of the image to control the working state of the driving circuit; the driving circuit is used for receiving the control signal sent by the signal processing unit to drive the working state of the liquid lens; the power supply component is used for supplying the lighting source, the image sensor, the driving circuit, the signal processing unit and the control component with power. The handheld fundus camera based on the liquid lens is simple in structure, small in size and capable of achieving full-automatic focusing based on the feedback control of the evaluation index of the definition of the image.

Description

technical field [0001] The invention relates to the field of medical imaging, in particular to a hand-held fundus camera based on a liquid lens. Background technique [0002] The hand-held fundus camera belongs to the field of medical imaging, and is used to obtain images of the retina of the human eye, to perform fundus disease inspection and to assist in the judgment of other organs. At present, there are mainly two methods for focusing the handheld fundus camera, one is manual focusing by adjusting the relative position of optical components or sensors, and the other is automatic focusing. However, the current manual focusing and automatic focusing methods require complex mechanical and motor drive methods, which limit the improvement of hand-held fundus cameras in terms of size, weight and battery life. [0003] With the development of active optical devices, active optical technology is gradually applied to ophthalmic optical imaging, such as laser confocal technology....

AI Technical Summary

Problems solved by technology

However, because the technical route of this invention introduces optical components such as two beam splitters, crosshairs and target locators, the optical path is more complicated, which increases the difficulty of camera installation and adjustment, and the reflected light from the fundus is very weak, so the beam splitter The introduction of the sensor further increases the requirements for the sensor and exposure, making it difficult to reduce the system cost, and the amount of light radiation borne by the human eye is also relatively large

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