| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a concentration detector for exactly measuring concentration of a liquid being an object to be measured even if transmittance of the liquid is different, and to provide an image forming apparatus. Ž<P>SOLUTION: The concentration detector includes: a light-emitting element 131a emitting light; light-emitting element holding parts 131b, 131c and 131d holding the light-emitting element 131a; a light-receiving element 132a receiving the light from the light-emitting element 131a; light-receiving element holding parts 132b, 132c and 132d holding the light-receiving element 132a; a rotating member 122 including a light transmission part 122a and a light-shielding part 122b and rotating so that the light transmission part may move through a gap 133 formed by the light-emitting element holding parts 131b, 131c and 131d and the light-receiving element holding parts 132b, 132c and 132d between the light-emitting element 131a and the light-receiving element 132a; and optical paths 131e and 132e constituted to receive the light from the light-emitting element 131a by the light-receiving element 132a without passing through the gap 133. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
