| 摘要 |
<p>A toner density sensor includes a liquid developer tank (1) for accommodating liquid developer (2) to be used for development, a diluting liquid tank (3) for accommodating diluting liquid (4) formed of a base material of the liquid developer (2), and a mixing chamber (5) disposed outside and connected to the tanks (1, 3) through a first valve (7) and a first pump (9), and a second valve (8) and a second pump (10), respectively. The valves (7, 8) and pumps (9, 10) are controlled so as to be opened or closed by a control driver (17). A passage (13) of a circulation type is formed in part of the mixing chamber (5) with a third pump (11) interposed therein, and a transparent cell element (14) for measuring a transmission light amount through fluid passing through the inside thereof is disposed in the passage (13). Further, a light emitting element (15) and a light receiving element (16) are disposed such that the transparent cell element (14) is positioned between them. <IMAGE></p> |
