| 摘要 |
PURPOSE:To enable the adjustment of the quantity of light with a simple construction by making an optical fiber as a part of a reference light optical path and as a part of a light quantity adjustor. CONSTITUTION:The emission end face 10a of the first optical fiber (OF) 11 is set so as to align the optical axis of the incident end face 11a of the second OF11. A rack section 12a formed on a support base 12 of the OF parallel with the optical axis and a rack section 13a formed on a support base 13 of the OF11 parallel with the optical axis are engaged with a pinion 14 and when the pinion 14 is turned in the direction of the arrow R, for instance, the space between the end face 10a of the OF10 and the end face 11a of the OF11 on the optical axis narrows while when it is turned in the direction of the arrow L, the space expands. This permits light to be attenuated according to the distance between the end face 10a of the OF10 and the end face 11a of the OF11 and enter the end face 11a of the OF. Thus, the radiation light attenuated to a desired value is emitted from the emission end provided at a light receiving section passing through the OF11 and incident on a light receiving section to make a reference light thereby enabling the adjusting of light with a simple construction. |
