| 摘要 |
PURPOSE:To omit a light emitting matter of high luminance used at a light emitting part as well as a photodetecting matter of high sensitivity used at a photodetecting part respectively and therefore decreasing power consumption, by using a reflector containing plural faces having proper angles of reflection and leading the center part of the luminous flux to plural photodetecting parts. CONSTITUTION:The luminous flux reflected by a light emitting part 1 is reflected again by a reflecting part 6 containing a reflector consisting of two reflecting faces 6a and 6b having proper angles of reflection. Then the right half of the luminous flux reflected by the face 6a transmits a turntable 3 and reaches a photodetecting part 4. While the left half of the luminous flux reflected by the face 6b transmits the turntable 3 and reaches a photodetecting part 5, respectively. Thus application of the center part of the luminous flux delivered from the part 1 can omit a light emitting matter of high luminance used at the part 1 as well as a photodetecting matter of high sensitivity used at a photodetecting part respectively for an optical size detector. |
