| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a powder flow rate detector which includes another light receiving element for directly receiving light of a light source, generates a reference voltage of a comparator from the output of the light receiving element, and accordingly hardly generates an error, in a method of detecting a powder flow rate by irradiating moving powder with light of the light source, and receiving the light having passed through the powder in a light receiving element. <P>SOLUTION: The powder flow rate detector which includes a light source 2, a first light receiving element 7 for directly receiving light of the light source and a second light receiving element 3 for receiving the light of the light source having passed through a moving powder 6 includes a comparator 4 for comparing the output of voltage-dividing means 5 for dividing the output of the first light receiving element 7 to the output of the second light receiving element 3. <P>COPYRIGHT: (C)2012,JPO&INPIT |
