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Developing-method-for-developer-transfer-under-A-C-electrical-bias-and-apparatus-therefor

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Developing method for developer transfer 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 a low frequency alternating electrical bias is applied to the space between a latent image bearing member and a developer carrying member to develop the latent image on the latent image bearing member, and an apparatus for carrying out the same method. This bias has a first process in which reciprocal movement of developer particles is effected also between the non-image area of the latent image bearing member and the developer carrying member, and a second process in which the intensity of the bias is adjusted so that one-sided movement of developer particles from the developer carrying member to the image area and one-sided movement of developer particles from the non-image area to the developer carrying member may take place.

DETAILED DESCRIPTION The present invention has been made to eliminate the above-noted problems peculiar to the various developing methods using one-component developer, and it is a primary object of the invention to provide a developing method which enables obtainment of visible images which are free of fog and excellent in edge reproduction and tone gradation, 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 alternating 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 a developing method which has a first process in which an extraneous vibratory electric field is imparted so that the low frequency electric field in the developing clearance may alternate in at least the non-image area of the latent image bearing member, whereby reciprocal movement of the developer particles may take place between the non-image area and the developer carrier, and a second process in which the intensity of the extraneous vibratory electric field is adjusted to cause one-sided transition of the developer particles from the developer carrier to the image area and from the non-image area to the developer carrier, thereby obtaining a result of development which is free of fog and excellent in tone gradation, and an apparatus therefor

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