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Magnetic-developing-method-under-A-C-electrical-bias-and-apparatus-therefor

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Magnetic developing method under A.C. electrical bias and apparatus therefor

Details

Inventors: Kanbe, Junichiro; Toyono, Tsutomu; Hosono, Nagao; Takahashi, Tohru;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Martin, Jr.; Roland E.
Assistant Examiner:
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto

This specification discloses a method of toner transfer development in which one-component magnetic developer is conveyed to a developing position by the action of a magnetic field and a low frequency alternating electrical bias is applied to the space between a latent image bearing member and a developer carrying member at that position to thereby develop a latent image. This development provides visible images excellent in sharpness and tone reproduction.

DETAILED DESCRIPTION It is an object of the present invention to provide a developing method in which a latent image is developed by subjecting a magnetic developer to the action of an electric field and applying a low frequency alternating voltage to the developing clearance with a view to improve the tone reproduction in transfer development, and an apparatus therefor.
It is another object of the present invention to provide a developing method based on the principle of development in which a low frequency alternate electric field having a phase of a particular polarity which causes the developer to one-sidedly reach both the image area and the non-image area of a latent image bearing member from a developer carrier and a phase of the opposite polarity to the particular polarity which applies a bias in a direction to cause the developer having reached at least the non-image area to return to the developer carrier side is applied in the developing clearance to thereby ensure transition of the developer to the non-image area and back transition of the developer to the developer carrier to be alternately repeated even in the clearance between the developer carrier and the non-image area in the developing station and enable a development very excellent in tone reproduction to be accomplished by such reciprocal movement of the developer, and an apparatus therefor.
It is still another object of the present invention to provide an electrostatic image developing method in which a magnetic developer is conveyed to the developing station while being restrained on a developer carrier by the action of a magnetic field and in the developing station, the developer carrier is disposed in opposed relationship with an electrostatic image bearing member with a clearance maintained therebetween, the clearance being greater than the thickness of the magnetic developer layer and development is effected by applying an alternate electric field of low frequency (preferably lower than 1.
5 KHz) so that the bias field in the developing clearance alternates the magnetic developer particles both in the image area and the non-image area, and an apparatus therefor

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