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US 6,487,385 B2Granted
Liquid electrophotographic imaging system with a maximized solid toner ratio
AssigneeNEC Corporation
InventorsTomoyuki Yoshii, Yasuhiro Funayama, Jun Koyatsu, Tsutomu Uezono
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Abstract
A liquid electrophotographic developing apparatus capable of preventing image drift and reducing the load in the squeezing process. A developing roller faces a photoreceptor belt with a predetermined spacing to supply a liquid developer to the photoreceptor belt while rotating at a peripheral velocity in the opposite direction to that of the photoreceptor belt in a developing region thereon. A peripheral velocity ratio of the peripheral velocity to a moving velocity of the photoreceptor belt is determined so as to maximize a solid component ratio of a developed toner layer on the photoreceptor belt.
Claims12
A developing apparatus for developing an electrostatic latent image on a latent substrate using a liquid developer in which toner particles are dispersed in a dielectric fluid, wherein the latent image substrate moves at a predetermined velocity in a first direction, comprising:
- a developing roller facing the latent image substrate with a predetermined spacing, for supplying the liquid developer to the latent image substrate while rotating at a peripheral velocity in a second direction, wherein the second direction is opposite to the first direction in a developing region on the latent image substrate,
- wherein a peripheral velocity ratio of the peripheral velocity of the developing roller to the predetermined velocity of the latent velocity image substrate is determined so as to maximize a solid component ratio of a developed toner layer on the latent image substrate,
- wherein a peak peripheral velocity ratio (kt) providing a maximum solid component ratio of a developed toner layer is represented by
- kt=(2mt/Lρc)+1,
- wherein mt is a saturated amount of developer toner, L is a length of the predetermined spacing, ρ is a density of the liquid developer, and c is concentration of the liquid developer.
2 more elements
A developing apparatus for developing an electrostatic latent image substrate using a liquid in which toner particles are dispersed in a dielectric fluid, wherein the latent image substrate moves at a predetermined velocity in a first direction, comprising:
- a developing roller facing the latent image substrate with a predetermined spacing, for supplying the liquid developer to the latent image substrate while rotating at a peripheral velocity in a second direction, wherein the second direction is opposite to the first direction in a developing region on the latent image substrate,
- wherein a peripheral velocity ratio of the peripheral velocity of the developing roller to the predetermined velocity of the latent image substrate is determined so as to maximize a solid component ratio of a developed toner layer on the latent image substrate,
- wherein a peak peripheral velocity ratio (kt) providing a maximum solid component ratio of a developed toner layer is represented by kt = mt + mt 2 + 2 mtLc ρ Lc ρ
- wherein mt is a substrated amount of developed toner, L is a length of the predetermining spacing, ρ is a density of the liquid developer, and c is a concentration of the liquid developer.
1 more element
An image forming apparatus comprising:
- a latent image substrate moving at a predetermined velocity in a first direction;
- a developing roller facing the latent image substrate with a predetermined spacing, for supplying a liquid developer including toner particles to the latent image substrate while rotating at a peripheral velocity in a second direction, wherein the second direction is opposite to the first direction in a developing region on the latent image substrate;
- a squeezing roller for squeezing the developed toner layer to produce a toner image on the latent image substrate;
- and
- a transfer section for transferring the toner image to another medium,
- wherein a peripheral velocity ratio of the peripheral velocity of the developing roller to the predetermined velocity of the latent image substrate is determined so as to maximize a solid component ratio of a developed toner layer on the latent image substrate,
- wherein a peak peripheral velocity ratio (kt) providing a maximum solid component ratio of a developed toner is represented by
- kt=(2mt/Lρc)+1,
- wherein mt is a substrated amount of developed toner, L is a length of the predetermined spacing, ρ is a density of the liquid developer, and c is concentration of the liquid developer.
6 more elements
An image forming apparatus comprising:
- a latent image substrate moving at a predetermined velocity in a first direction;
- a developing roller facing the latent image substrate with a predetermined spacing, for supplying a liquid developer including toner particles to the latent image substrate while rotating at a peripheral velocity in a second direction, wherein the second direction is opposite to the first direction in a developing region on the latent image substrate;
- a squeezing roller for squeezing the developed toner layer to produce a toner image on the latent image substrate;
- and
- a transfer section for transferring the toner image to another medium,
- wherein a peripheral velocity ratio of the peripheral velocity of the developing roller to the predetermined velocity of the latent image substrate is determined so as to maximize a solid component ratio of a developed toner layer on the latent image substrate,
- wherein a peak peripheral velocity ratio (kt) providing a maximum solid component ratio of a developed toner is represented by kt = mt + mt 2 + 2 mtLc ρ Lc ρ
- wherein mt is a substrated amount of developed toner, L is a length of the predetermined spacing, ρ is a density of the liquid developer, and c is concentration of the liquid developer.
5 more elements
An image forming apparatus comprising:
- photoreceptor belt rotating at a predetermined velocity in a first direction;
- a plurality of developing devices corresponding to different colors, the developing device being arranged along the first direction, each of the developing devices comprising:
- a developing roller facing the photoreceptor belt with a predetermined spacing, for supplying a liquid including color toner particles to the photoreceptor belt while rotating at a peripheral velocity in a second direction, wherein the second direction is opposite of the first direction in a developing region on the photoreceptor belt;
- and
- squeezing roller for squeezing toner layer to produce a color toner image on the photoreceptor belt;
- and
- a transfer section for transferring a multicolor toner image obtained by a sequence of the developing devices to another medium,
- wherein a peripheral velocity ratio of the peripheral velocity of the developing roller to the predetermined velocity of the photoreceptor belt is determined so as to maximize a solid component ratio of a developed toner layer on the photoreceptor belt,
- wherein a peak peripheral velocity ratio (kt) providing a maximum solid component ratio of a developed toner layer is represented by
- kt=(2mt/Lρc)+1.
- where mt is a saturated amount of developed toner, L is a length of the predetermined spacing, ρ is a density of the liquid developer, and c is concentration of the liquid developer.
8 more elements
An image forming apparatus comprising:
- a photoreceptor belt rotating at a predetermined velocity in a first direction;
- a plurality of developing devices corresponding to different colors, the developing device being arranged along the first direction, each of the developing devices comprising:
- a developing roller facing the photoreceptor belt with a predetermined spacing, for supplying a liquid developer including color toner particles to the photoreceptor belt while rotating at a peripheral velocity in a second direction, wherein the second direction is opposite to the first direction in a developing region on the photoreceptor belt;
- and
- a squeezing roller for squeezing the developed toner layer to produce a color toner image on the photoreceptor belt;
- and
- a transfer section for transferring a multicolor toner image obtained by a sequence of the developing devices to another medium,
- wherein a peripheral velocity ratio of the peripheral velocity of the developing roller to the predetermined velocity of the photoreceptor belt is determined so as to maximize a solid component ratio of a developed toner layer on the photoreceptor belt,
- wherein a peak peripheral velocity ratio (kt) providing a maximum solid component ratio of a developed toner is represented by kt = mt + mt 2 + 2 mtLc ρ Lc ρ
- where mt is a saturated amount of developed toner, L is a length of the predetermined spacing, ρ is a density of the liquid developer, and c is concentration of the liquid developer.
7 more elements
Dependencies are inferred from the claim text.