专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH03285128A SELECTION OF COLOR TONE OF LIGHT EMITTING ELEMENT 失效
公开(公告)号：JPH03285128A
公开(公告)日：1991-12-16
申请号：JP8679190
申请日：1990-03-30
申请人： SHARP KK
发明人： OTANI TADASHI
IPC分类号： G01J3/50 , G01J1/22
摘要： PURPOSE:To enhance measuring accuracy and to select color tone of a light emitting element by calculating the ratio of the light output of a photodetector obtained when a cut filter is interposed and that of the photodetector obtained when no cut filter is interposed. CONSTITUTION:At first, a cut filter 2 having a spectral characteristic is set on an LED light emitting element 1 having an emission spectrum distribution and a photodetector 3 is further mounted thereon to measure the short current of the photodetector 3 by a digital multimeter 5. Next, the short current of the photodetector 3 is measured by the digital multimeter 5 in such a state that the cut filter 2 is detached. Subsequently, the ratio R of the short current obtained when the cut filter 2 is interposed between the light emitting element 1 and the photodetector and that obtained when no cut filter 2 is interposed is calculated. By separating color ranks on the basis of this numerical value R, light tone of the LED light emitting element 1 can be selected.

IPRDB