DC Contact Charging Pairing for Color-Streak-Free Image Forming
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Solution Overview
Problem
Existing electrophotographic image forming apparatuses experience color streaks due to the interaction between the charging member and the electrophotographic photoreceptor, which is not adequately addressed by current technologies.
Innovation Solution
The image forming apparatus employs a direct current voltage system with a specific relationship between the dielectric film thickness of the electrophotographic photoreceptor and the resistance component of the charging member, defined by Expression (1): L < −0.75×loge(R) + 15.79, to stabilize discharge variation and suppress color streaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional charging member and electrophotographic photoreceptor are used in a DC contact charging type image forming apparatus, then the apparatus can operate with simple voltage application, but color streaks occur in the formed images
Solution Approach 1:
The patent applies parameter changes by establishing a specific mathematical relationship (L < -0.75×loge(R) + 15.79) between the dielectric film thickness L of the photoreceptor and the resistance component R of the charging member. By controlling these physical parameters within defined ranges, the invention suppresses color streaks while maintaining DC contact charging operation, resolving the contradiction between operational simplicity and image quality.
2Reliability
If the dielectric film thickness of the electrophotographic photoreceptor is increased, then the charge storage capacity is improved, but color streaks are more likely to occur
Solution Approach 1:
The patent resolves this contradiction by introducing a coupled parameter control approach. Instead of independently optimizing dielectric film thickness, the invention defines a relationship where L < -0.75×loge(R) + 15.79, linking the photoreceptor's dielectric thickness to the charging member's resistance. This allows achieving adequate charge storage capacity while suppressing color streaks through coordinated parameter selection.
Solution Approach 2:
The resistance component R of the charging member acts as an intermediary parameter that mediates between the dielectric film thickness L and the occurrence of color streaks. By controlling R in relation to L through the defined mathematical relationship, the charging member's resistance serves as a controlling variable that enables charge storage while preventing discharge variations that cause color streaks.
3Productivity
If the resistance component of the charging member is decreased, then the charging efficiency is improved, but discharge variation increases causing color streaks
Solution Approach 1:
The patent applies parameter changes by establishing that the resistance component R of the charging member should satisfy L < -0.75×loge(R) + 15.79 in relation to the dielectric film thickness. This parameter control enables adequate charging efficiency while maintaining stable discharge characteristics, preventing color streaks by keeping R within appropriate ranges relative to L.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses color streaks in both normal and high-humidity environments by stabilizing the discharge cycle, ensuring high-quality image output.
Implementation Method 1
a charging member that includes a conductive base material B and an elastic layer provided on the conductive base material B
Implementation Method 2
an electrophotographic photoreceptor that includes a conductive base material A and a photosensitive layer provided on the conductive base material A
Implementation Method 3
an elastic layer provided on the conductive base material B
Data Source
AI summary
A contact charging type image forming apparatus, to which only a direct current voltage is applied, includes an electrophotographic photoreceptor that includes a conductive base material A and a photosensitive layer provided on the conductive base material A, and a charging member that includes a conductive base material B and an elastic layer provided on the conductive base material B, in which in a case where a dielectric film thickness of the electrophotographic photoreceptor is defined as L, and a resistance component of an impedance of the charging member in a range of 1 Hz or greater and 500 Hz or less, which is measured by an alternating current impedance method, is defined as R, Expression (1) is satisfied.L<−0.75×loge(R)+15.79 Expression(1)