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US 7,095,972 B2Granted
Toner image transfer method, toner image transfer device and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorSadayuki Iwai
Life of this patent
Estimating the term…
Abstract
A toner image transfer method for transferring a toner image formed on a latent image carrier onto a transfer image carrier. A reference running speed of the latent image carrier VA and a reference running speed of the transfer image carrier VB are set substantially as VA=VB=V. A relative speed ΔV between the latent image carrier and the transfer image carrier is changed in vibration at a high speed to positive and negative sides around the reference running speed V, thereby to carry out an image transfer.
Claims22
A method for transferring a toner image from a latent image carrier to a transfer image carrier, comprising:
- running the latent image carrier at a reference running speed VA and running the transfer image carrier at a reference running speed VB, wherein VA=VB;
- and
- transferring the toner image from the latent image carrier to the transfer image carrier while controlling at least one of the latent image carrier and the transfer image carrier in such a manner that a relative speed ΔV between the latent image carrier and the transfer image carrier is changed to positive and negative sides of an average reference running speed V, where V=VA=VB, wherein
- the transferring includes controlling either one or both of the latent image carrier and the transfer image carrier in such a manner that the relative speed ΔV varies in approximately a sinusoidal wave shape, with respect to time, around the average reference running speed V.
1 more element
A method for transferring a toner image from a latent image carrier to a transfer image carrier, comprising:
- running the latent image carrier at a reference running speed VA and running the transfer image carrier at a reference running speed VB, wherein VA=VB;
- and
- transferring the toner image from the latent image carrier to the transfer image carrier while controlling at least one of the latent image carrier and the transfer image carrier in such a manner that a relative speed ΔV between the latent image carrier and the transfer image carrier is changed to positive and negative sides of an average reference running speed V, where V=VA=VB,
- wherein a frequency f(hertz) of the relative speed ΔV is such that the ratio of frequency to ΔV is equal to or more than 4/mm.
1 more element
A method for transferring a toner image from a latent image carrier to a transfer image carrier, comprising:
- running the latent image carrier at a reference running speed VA and running the transfer image carrier at a reference running speed VB, wherein VA=VB;
- and
- transferring the toner image from the latent image carrier to the transfer image carrier while controlling at least one of the latent image carrier and the transfer image carrier in such a manner that a relative speed ΔV between the latent image carrier and the transfer image carrier is changed to positive and negative sides of an average reference running speed V, where V=VA=VB, wherein
- when the variation of the relative speed ΔV around the reference running speed V (mm/s) of the latent image carrier and the transfer image carrier respectively is expressed, by using a standardized waveform g(t) of the variation and a coefficient α, as
- ΔV=α·V·g(t),
- a reference frequency f(hertz) of the variation of the relative speed ΔV, the coefficient α, the average reference speed V, and the waveform g(t) satisfy a condition
- d
- >
- α
- ·
- V
- ·
- ∫
- t
- =
- 0
- 1
- /
- (
- 2
-
- f
- )
-
- g
-
- (
- t
- )
- ·
- ⅆ
- t
- ,
- for a minimum resolution distance d (millimeters) that is desired for the toner image which is transferred.
31 more elements
A toner image transfer device comprising:
- a latent image carrier with a toner image;
- a transfer image carrier onto which the toner image from the latent image carrier is to be transferred;
- a latent image carrier driving unit that drives configured to drive the latent image carrier at a reference running speed VA;
- a transfer image carrier running unit configured to run the transfer image carrier, while bringing the transfer image carrier into contact with the latent image carrier, at a reference running speed VB that is substantially equal to the reference running speed VA of the latent image carrier driving unit;
- a transfer image carrier driving unit configured to drive the transfer image carrier running unit;
- a transfer unit configured to apply a transfer voltage to a contact portion between the latent image carrier and the transfer image carrier;
- and
- a controller configured to control at least one of the latent image carrier driving unit and the transfer image carrier driving unit in such a manner that a relative speed ΔV of the between the latent image carrier and the transfer image carrier is changed to positive and negative sides of an average reference running speed V, where V=VA=VB, wherein
- the controller is further configured to change mutual phases of the latent image carrier and the transfer image carrier.
6 more elements
An image forming apparatus comprising:
- a latent image carrier with a toner image;
- a transfer image carrier onto which the toner image from the latent image carrier is to be transferred;
- a latent image carrier driving unit configured to drive the latent image carrier at a reference running speed VA;
- a transfer image carrier running unit configured to run the transfer image carrier, while bringing the transfer image carrier into contact with the latent image carrier, at a reference running speed VB that is substantially equal to the reference running speed VA of the latent image carrier driving unit;
- a transfer image carrier driving unit configured to drive the transfer image carrier running unit;
- a transfer unit configured to apply a transfer voltage to a contact portion between the latent image carrier and the transfer image carrier;
- and
- a controller configured to control at least one of the latent image carrier driving unit and the transfer image carrier driving unit in such a manner that a relative speed ΔV between the latent image carrier and the transfer image carrier changes to positive and negative sides of an average reference running speed V, where V=VA=VB, wherein
- the controller is further configured to change mutual phases of the latent image carrier and the transfer image carrier.
6 more elements
Dependencies are inferred from the claim text.