电机补偿式焦度仪镜片参数的计算

针对目前市场上测量眼镜片相关参数全自动焦度仪测量范围小、测量精度较差等问题,研制了基于电机补偿原理的焦度仪。该焦度仪采用步进电机带动分划板做线性运动对分划板的位置进行补偿,通过改变焦度仪光学系统的物像关系来提高焦度仪的测量精度,扩大它的测量范围。测量时放入待测镜片,待整个调节过程结束后,电器部件会将每个接收到的图像进行分析计算后取平均值,得到待测镜片的各项参数。利用本样机对一些典型镜片进行了测量,结果显示所有镜片的误差范围均在±0.02 m-1内,表明本文研制的焦度仪完全符合国家计量检定规程的计量检定要求。

Calculation of lens parameters for lensmeters based on motor compensation

Automatic lensmeter is an instrument for measuring optical parameters of glasses.For several universal problems on the small measurement range and poor accuracy of the automatic lensmeter,this paper developeds a instrument.It uses motor compensation principle to adjust the linear motion position of a partition board to implement the compensation,and changes the relation of the images and the object to achieve the focal power measurement accuracy and enlarge the measuring range.When a lens is placed in the optical system until the end of the adjustment process,the electrical components will receive the image and analyze the averaged calculation,which can get the parameters of the lens under test.After a system demonstration and testing,the prototype is used to successful measure some typical lenses.The results show that all lenses are in the range of error within ±0.02 m-1.The measurement results fully meet the requirements of national metrological verification test.