摘要: 論述了
眼底照相機的原理和控制
雜光及
鬼像的方法。通過精心設(shè)計
照明系統(tǒng)的接目物鏡,使其各個
光學(xué)表面產(chǎn)生的鬼像位于較理想的位置,并通過在照明光路中加入較少的黑點板予以消除。同時通過使照明系統(tǒng)的環(huán)行光闌與照相系統(tǒng)的孔徑光闌處于相互共軛的位置上,達(dá)到消除照明系統(tǒng)產(chǎn)生雜光和鬼像的目的。
[Fk|m1i! 關(guān)鍵詞:
光學(xué)設(shè)計; 眼底照相機; 雜光; 鬼像
{.o4U0+ 中圖分類號: TB851; R774.1 文獻(xiàn)標(biāo)識碼: B
\_(0V" 文章編號: 1002-1582(2000)02-0139-03Control of ghost and scatter light in retinal cameraCUI Gui-hua
eoQt87VCU (
Optical Engineering Dept. Beijing Institute of Technology, Beijing 100081) Abstract: A method for clear up the harmful light such as scatter light and central ghost in retinal camera was introduced. In designing the objective lens of the illumination, we set the ghost generated by some optical surfaces at nearly same position, and then added some black spot plates in the illumination path, also conjugated the ring-like stop of the illumination system with the aperture stop of photography system.
Gi$\th, Key words: optical design; retinal camera; scatter light; ghost1
ZC<EPUV( f4NN?"W) 引 言
D;+Y0B ncOl}\Q9 人眼的視網(wǎng)膜又稱為眼底,是人眼的重要組成部分。人眼的病態(tài),除小部分是因為角膜、水晶體等而引起的外,大部分是因為眼底病態(tài)而引起的。因此,眼底是診斷眼病甚至是全身多種疾病的重要依據(jù)。眼底照相機是用來觀察和記錄眼底狀況的眼科醫(yī)療光學(xué)儀器,它能夠?qū)⒀鄣讏D像以黑白或彩色照片的形式記錄和保存下來。
yT7{,Z7t \:q