JJG580-1996-焦度计检定规程.pdf

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1、冰谬锡中华人民共和国国家计量检定规程JJG580-1996焦度计Forimeters1996一11一21发布1997一05一01实施国家技术监督局发布JJG580-1996产。.补0.~0.0.0.O.0.0.补0.0.0.、勺。.-心心;.心-，焦度计检定规程心JJG580-1996.。，乙。代替JJG580-1988.弓。;‘VerificationRegulationofFocimeters.七洲本检定规程经国家技术监督局于1996年11月21日批准，并自1997年05月01日起施行。归口单位:陕西省技术监督局起草

2、单位:陕西省计量测试研究所本规程技术条文由起草单位负责解释JJG580-1996本规程主要起草人:王侠(陕西省计量测试研究所)唐国安(陕西省计量测试研究所)陈峻(陕西省计量测试研究所)参加起草人:安健(西安市计量测试研究所)张玫(西安市计量测试研究所)JJG580-1996目录一概述·······················································································⋯⋯(1)(一)用途························

3、·························································⋯⋯(1)(二)定义·················································································⋯⋯(1)(三)分类·················································································⋯⋯(2)(四)焦度计显示顶焦度值的波长····

4、·············。·································⋯⋯(2)(五)测量范围···········································································⋯⋯(2)(六)刻度间隔···········································································⋯⋯(2)二技术要求·...............................

5、.......................................................(2)三检定条件············。··································。·································⋯⋯(4)四检定项目和检定方法·.......................................................................(q)五检定结果处理和检定周期·................

6、.................................................(5)附录1焦度计检定证书(背面)格式················································⋯⋯(6)附录2焦度计检定记录表·······························································⋯⋯(7)JJG580-1996焦度计检定规程本规程适用于新制造、使用中和修理后的焦度计的检定。一概述(一)用途焦度计主要用于测量眼镜片

7、(包括角膜接触镜片)的顶焦度(D)、棱镜度(△)，确定散光镜片的柱镜轴位方向，在未切边镜片上打印记，并可检查镜片是否正确安装在镜架中等。(二)定义1顶焦度对于镜片的测定，通常使用顶焦度的概念，一个镜片含有两个顶焦度。1)后顶焦度以米为单位测得的镜片近轴后顶焦距的倒数。如图所示。图1后顶焦度定义示意图从镜片后表面顶点到眼镜片后焦点的距离称为后顶焦距if-，它的倒数称为后顶焦度，即李。后顶焦度的表示单位为米的倒数，量纲为M-1，单位名称为屈光度，以符tf号D表示。用焦度计测量的眼镜片的顶焦度值均为后顶焦度，眼镜行业不作特别说

8、明而使用的顶焦度值，均为后顶焦度。2)前顶焦度以米为单位测得的眼镜片近轴前顶焦距的倒数。单位同上。2球镜度球镜镜片的后顶焦度值称为球镜度，符号:sph(SPH)o3柱镜度散光镜片中两个顶焦度之差值。符号:cyl(CYL)。散光镜片是一种使近轴平行光线会聚于两条分离的相互正交的焦线上的镜片，这种镜片一般含有两个顶焦度。