US 11,815,828 B2
Developing device
Fumitaka Sobue, Chiba (JP); Koichiro Ino, Tokyo (JP); Yosuke Hata, Chiba (JP); Masaaki Moriya, Ibaraki (JP); and Norio Negishi, Tokyo (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 15, 2021, as Appl. No. 17/551,403.
Claims priority of application No. 2021-009427 (JP), filed on Jan. 25, 2021.
Prior Publication US 2022/0236664 A1, Jul. 28, 2022
Int. Cl. G03G 15/08 (2006.01)
CPC G03G 15/0853 (2013.01) [G03G 15/0889 (2013.01); G03G 15/086 (2013.01)] 13 Claims
OG exemplary drawing
 
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.