A large field of view illuminating device for fundus imaging
A lighting device and large field of view technology, applied in the field of large field of view lighting devices and large field of view lighting devices, can solve the problems of complex manufacturing process, difficult design, high cost, etc., achieve compact structure and reduce the difficulty of optical design , The effect of reducing the difficulty of installation and adjustment
Active Publication Date: 2015-12-16
TIANJIN SUOWEI ELECTRONICS TECH
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Problems solved by technology
This device can increase the illumination field of view to more than 120 degrees, but the design is difficult, the manufacturing process is very complicated, the installation and adjustment are difficult, and the cost is expensive
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[0028] The implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.
[0029] Optical Principles of the Invention.
[0030] When designing a fundus camera, the pupil of the human eye is generally selected as the entrance pupil of the imaging optical system. The reflected light from the fundus exits the pupil and enters the imaging optical system. The illumination source is placed behind the contact lens and on both sides of the imaging optical system. Due to the high vertical axis height of the peripheral field of view light, the size of the imaging optical system is relatively large, which in turn prevents the central area of the fundus from being illuminated, such as figure 1 shown. Therefore, it is necessary to move the entrance pupil of the imaging optical system a certain ...
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The invention relates to a large-visual-field lighting device used for fundus imaging. The large-visual-field lighting device comprises a light frame in the shape of a circular truncated cone ring, multiple LED light source fixing grooves are formed in the outer side of the bottom of the light frame, an LED light source is fixedly mounted in each fixing groove, the light frame above the LED light sources is composed of a light guide plate inner wall ring and a light guide plate outer wall ring which clamp to form an annular light guide plate cavity, a corneal contact lens is fixedly mounted at an opening at the top end of the light frame and composed of a corneal contact lens central part and a corneal contact lens annular ring, a connecting surface is subjected to optical darkening, and an imaging object lens is fixedly mounted in the light frame cavity on the lower portion of the corneal contact lens central part. The LED light sources are used to form a lighting visual field exceeding 120 degrees at a fundus, and overlapping ratio of symmetric light beams in the central area of the fundus is increased, so that lighting uniformity and fundus imaging quality are improved.
Description
technical field [0001] The invention belongs to the technical field of optical medical instruments, and relates to a device that uses LEDs as a light source to realize a large field of view illumination on the fundus through a light guide plate and a corneal contact lens, in particular to a large field of view illumination for fundus imaging device. Background technique [0002] Fundus imaging technology has been widely used in clinical detection. Medicine shows that ophthalmic diseases and systemic diseases of the body will cause lesions in the retina of the fundus in the early stage of onset. Accurate and timely detection of retinopathy can play an important role in the early diagnosis of the disease, and can also provide a good platform for the pathological research of major diseases. According to the different clinical needs, the performance of the instrument varies widely, but generally it is developing in the direction of large field of view, high resolution and colo...
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IPC IPC(8): A61B3/12A61B3/15
Inventor 齐岳赵培泉王熙张昆王雪乔
Owner TIANJIN SUOWEI ELECTRONICS TECH