| 摘要 |
PURPOSE:To enable control of luminous quantity and measurement of the luminous quantity in a simple and positive manner, by installing a light branching body in front of each luminous body for branching a part of each luminous quantity and adding a luminous quantity measuring member made to oppose the branched light path and incident light quantity detecting light receiver. CONSTITUTION:The main slitted body consisting of slitted circular disc 10 is fixed on an angular displacement detecting shaft 1 and an auxiliary slitted body consisting of slitted plate 20 is installed in an opposing manner to the above and the slitted part of slitted plate 20 is of a construction that position in which each slitted part is formed is deviated by (1/4 pitch plus integer pitch). Against this slitted part are layed out luminous bodies 31-34, half-mirror 60, light receiving member 35', 36', lens 40, light receiving body 50 and into the light receiving member 35' the light quantity is branched and introduced in proportion to each of luminous quantity of luminous bodies 31, 33 and into the light receiving member 36' luminous quantity proportional to the luminous quantity of luminous bodies 32, 34 is branched and introduced and thus the luminous quantity of each luminous body is controlled according to output of each light receiving member. |
