Developing device
The developing apparatus addresses toner scattering and carrier accumulation issues by using magnetic pole arrangements to control carrier direction, ensuring effective toner suction and reducing image defects.
JP2026110041APending Publication Date: 2026-07-02CANON KK
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- CANON KK
- Filing Date
- 2024-12-20
- Publication Date
- 2026-07-02
AI Technical Summary
Technical Problem
Existing developing devices face issues with toner scattering and carrier accumulation in the suction path, leading to inadequate toner suction and potential image defects, particularly under high-speed operation conditions.
Method used
A developing apparatus with a duct configuration that utilizes magnetic pole arrangements to control the direction of magnetic force on carriers, preventing them from entering the suction path and ensuring effective toner collection.
Benefits of technology
Prevents carrier accumulation in the suction path, ensuring reliable toner suction and reducing image defects by maintaining optimal airflow and developer collection efficiency.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure 2026110041000001_ABST
Abstract
This configuration provides a way to prevent the carrier from being collected by the suction duct 70. [Solution] Let Q be the point where the line connecting the tip P on the second developing roller 31 side of the upper part 72 of the suction duct 70 and the rotation center O of the second sleeve 34 intersects the surface of the second sleeve 34, and let R be the position on the second sleeve 34 where the absolute value of the magnetic flux density in the normal direction of the second transport pole 206 is maximum. In this case, position R is located downstream of point Q with respect to the rotation direction of the second sleeve 34 and faces the upper part 72 of the duct. Furthermore, if we define Fθ as the tangential magnetic force among the magnetic forces acting on the carrier on the second sleeve 34, and the direction in which Fθ is opposite to the rotation direction of the second sleeve 34 as negative, then the magnetic force Fθ is negative in the range from point Q to position R.
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