CPC G03G 15/0853 (2013.01) [G03G 15/0889 (2013.01); G03G 15/086 (2013.01)] | 13 Claims |
1. A developing device comprising:
a developer carrying member configured to carry a developer, containing toner and a carrier, for developing an electrostatic latent image formed on an image bearing member;
a developer container configured to accommodate the developer; and
an oscillation circuit including a resonance circuit including a coil and a circuit portion containing a capacitor and configured to oscillate a signal for detecting a toner concentration of the developer accommodated in said developer container,
wherein said developer container includes an inner wall surface which is a wall surface on a side where the developer is accommodated and an outer wall surface which is a wall surface on a side where the developer is not accommodated, and
wherein said coil is formed integrally with said developer container by a metal film, and said coil is disposed on said inner wall surface of said developer container.
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