WO2001026906A1 - Procede et appareil de formation d'image - Google Patents

Procede et appareil de formation d'image Download PDF

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Publication number
WO2001026906A1
WO2001026906A1 PCT/JP1999/005593 JP9905593W WO0126906A1 WO 2001026906 A1 WO2001026906 A1 WO 2001026906A1 JP 9905593 W JP9905593 W JP 9905593W WO 0126906 A1 WO0126906 A1 WO 0126906A1
Authority
WO
WIPO (PCT)
Prior art keywords
charged
particle layer
particles
charged particle
image forming
Prior art date
Application number
PCT/JP1999/005593
Other languages
English (en)
Japanese (ja)
Inventor
Katsutoshi Ogawa
Akira Kumon
Yuji Takashima
Yoshitaka Kitaoka
Takuya Kitahara
Kotaro Takada
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Array Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd., Array Ab filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to AU60069/99A priority Critical patent/AU6006999A/en
Priority to PCT/JP1999/005593 priority patent/WO2001026906A1/fr
Publication of WO2001026906A1 publication Critical patent/WO2001026906A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/385—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
    • B41J2/41—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing
    • B41J2/415—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing by passing charged particles through a hole or a slit
    • B41J2/4155—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing by passing charged particles through a hole or a slit for direct electrostatic printing [DEP]
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • G03G15/0812—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer regulating means, e.g. structure of doctor blade
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2217/00—Details of electrographic processes using patterns other than charge patterns
    • G03G2217/0008—Process where toner image is produced by controlling which part of the toner should move to the image- carrying member
    • G03G2217/0025—Process where toner image is produced by controlling which part of the toner should move to the image- carrying member where the toner starts moving from behind the electrode array, e.g. a mask of holes

Definitions

  • the present invention is used in a printer such as a computer, a facsimile, a copying machine, and the like. Related to the device. Background art
  • a head member having a plurality of openings for allowing the charged particles to pass therethrough is disposed between a conveying member that carries and conveys the charged particles, and a counter electrode.
  • An image receiving body is arranged between the head member and the head member, and a control electrode is arranged around each opening of the head member.
  • a potential difference for forming an electrostatic field for transferring charged particles from the transport member toward the counter electrode is provided between the transport member and the counter electrode, and a voltage applied to the control electrode is controlled. By doing so, the opening is electrostatically opened and closed, and the charged particles are separated from the conveying member and passed through the opening to adhere to the image receiving body according to the image signal.
  • the charged particles easily accumulate around the opening of the head member, and the opening is clogged by the charged particles. That is, when the charged particles are transported by the transport member, a charged particle layer composed of charged particles is usually formed on the transport member. If the adhesive force of the charged particles is weak, the charged particles separate from the transfer member during transfer due to van der Waals force generated between the charged particles and the head member and the image force generated between the charged particles and the control electrode. It is deposited especially near the control electrode. When used for a long period of time, the amount of accumulated charged particles increases, and eventually the openings are closed and clogging occurs.
  • the charged particle layer has a large number of voids, and charged particles having different particle sizes, Since the secondary particles formed by agglomeration of a number of charged particles are included, the surface of the charged particle layer is not smooth but has irregularities. As a result, even when the voltage applied to the control electrode is relatively low, if the vicinity of the opening of the head member that causes the charged particles to fly from the transport member is brought close to the transport member, the convex portion of the charged particle layer becomes a head. Charged particles are scraped off by contact with the member, causing uneven image density and increasing the amount of accumulated charged particles.
  • Japanese Patent Application Laid-Open No. 58-128282 discloses that a high voltage is applied to a control electrode when it is detected that an image receiving member is not disposed, so that the control electrode and the counter electrode can be detected. It is described that a spark discharge is generated between the opening and the opening to repel toner clogged in the opening. Further, Japanese Patent Application Laid-Open No. 58-110469 discloses that by increasing the electric field between the control electrode and the image receiving member when image formation is not performed, toner staying in the opening can be reduced to the image receiving side. It is stated that it will be taken out.
  • Japanese Patent Application Laid-Open No. 58-107471 discloses that the electric field between the conveying member and the image receiving member and the electric field in the opening at the time of image recording are set so that the charged particles are directed to the image receiving member. At times, it is described that the direction of the electric field between the carrying member and the control member and the direction of the electric field between the control member and the image receiving member are reversed from those at the time of recording to prevent toner clogging of the opening. ing.
  • the head member having the opening is formed of synthetic resin, there is a concern that the head member may be broken by the spark discharge.
  • a separate power supply for generating spark discharge is required, and the charged particles may be heated by the discharge and fused to the head member.
  • any of the above methods requires the setting of a special voltage application mode for removing charged particles in the aperture, and also requires a special power supply (the charged particles cannot be removed without applying a considerably large voltage). Due to this, the cost tends to be high.
  • the particles on the conveying member are pressed with a predetermined pressing force.
  • a predetermined pressing force it is easy to form a charged particle layer while applying a charge to the particles.
  • the pressing force of the particles during the formation of the charged particle layer is considerably increased, the adhesive force between the charged particles in the charged particle layer is increased.
  • the adhesion between the charged particles and the transporting member increases, and the surface of the charged particle layer becomes smooth, so that the charged particles can be prevented from depositing on the head member, resulting in uneven image density and clogging of the openings.
  • students who can control the situation There are some students who can control the situation.
  • the particle pressing force at the time of forming the charged particle layer is increased, the thickness of the charged particle layer becomes too thin and the image density becomes low, and the adhesive force between the charged particles and the conveying member becomes too high, so that the control electrode becomes too high. Makes it difficult for charged particles to fly in response to the voltage applied to the charged particles.
  • the present invention has been made in view of the above-described points, and an object of the present invention is to suppress the accumulation of charged particles on a head member without causing a decrease in image density, and to reduce unevenness in image density and clogging of openings. It is to try to control the outbreak. Disclosure of the invention
  • the density of the charged particles is increased with respect to the charged particle layer formed on the transport member.
  • this is an image forming method for forming an image by attaching charged particles to an image receiving body, wherein a charge of the same polarity is applied to a large number of particles for forming an image, and the charged charge is applied.
  • the charged particle layer formed in the charged particle layer forming step Due to this, in the charged particle layer formed in the charged particle layer forming step, a large number of In addition to the presence of voids, the charged particles are non-uniform, and the charged particle layer surface has many irregularities.However, in the densification step, no extra voids in the charged particle layer are eliminated, and the charged particles are uniformly arranged. The adhesive force between the charged particles and the adhesive force between the charged particles and the transporting member are made uniform, so that a portion having a weak adhesive force is eliminated, and the surface of the charged particle layer is smoothed. As a result, the densely packed charged particle layer hardly comes into contact with the head member or the like in the transporting step, and even if it does, the charged particles hardly separate from the transport member.
  • the densification step does not remove the charged particles, so that the amount of the charged particles adhered is maintained and the image density does not decrease. Accordingly, it is possible to prevent the charged particles from depositing on the head member while preventing the image density from lowering, and to suppress the occurrence of image density unevenness and clogging of the openings.
  • the step of increasing the density may be specifically a step of pressing the charged particle layer. This makes it possible to easily increase the density of the charged particles in the charged particle layer.
  • the densification step includes a step of vibrating the charged particles of the charged particle layer between a transport member and an opposing member having a gap with respect to the transport member, and relocating the charged particles on the transport member. It may be about. With this configuration, the charged particles are loosened individually, and the charge amount of the charged particles is made uniform, so that the charged particles can be arranged more uniformly and densely. Even if the charged particles are aggregated to form secondary particles having a large particle diameter, the particles can be easily disintegrated into a single charged particle, thereby suppressing the clogging of the opening by the secondary particles. Can be
  • the charged particles When the charged particles are vibrated and rearranged as described above, it is desirable to include a step of removing particles attached to the facing member.
  • charged particles with a very low charge amount or very few charged particles (poorly charged particles) charged to the opposite polarity tend to adhere to the opposing member, but if they remain attached, they adversely affect the vibration of the charged particles.
  • the defective charged particles once removed from the charged particle layer return to the transport member again.
  • the particles adhering to the opposing member are removed in this way, the charged particles can be satisfactorily vibrated and arranged densely, and the defective charged particles can be reliably removed from the charged particle layer.
  • the vicinity of the opening of the head member is in contact with the densified charged particle layer.
  • the distance between the control electrode and the densely packed charged particle layer is always minimized, so that the charged particles can fly stably from the transport member.
  • the above-mentioned contact may remove the charged particles of the densely packed charged particle layer.
  • the charged particles of the densely packed charged particle layer have a high adhesive force as a whole as described above, It will not be done. Even if it is scraped off, it is deposited at a position almost in contact with the densified charged particle layer, so that it is collected on the conveying member side by a mirror image or van der Waals force.
  • the above-mentioned contact further increases the density of the charged particles and further smoothes the surface in the densely charged layer.
  • the vibrated charged particles may float on the opening of the head member. If the vicinity portion is in contact with the densely charged particles layer, the passage of the above-mentioned floating charged particles to the opening is blocked, and it is possible to prevent the floating charged particles from clogging the opening and adversely affecting the image.
  • the filling rate of the particles before the charge is applied is 31 to 50%. This is because if the filling ratio is less than 31%, the cohesion between the particles is too large, and the density of the charged particles cannot be sufficiently increased with respect to the charged particle layer. If the particle size is large, the cohesive force between the particles is too small, and the particles are easily separated from the transport member during the transport process.
  • the static bulk density in the above equation is determined using Powdertes Yu (registered trademark: manufactured by Hosokawa Miclon Co., Ltd. of Japan) at a temperature of 20 ° C. and a relative humidity of 50%. These values were measured with a mesh opening of 250 / m, a fall time of 3 minutes, and a Leos sunset level of 3 (the same applies hereinafter).
  • the image forming apparatus of the present invention for forming an image by adhering the charged particles to an image receiving body includes applying a charge of the same polarity to a large number of particles for forming an image, and charging the charged particles.
  • a high-density means for performing, a counter electrode disposed so as to face a position at which the high-density charged particle layer is conveyed in the conveying member, and a counter electrode disposed between the conveying member and the counter electrode;
  • a head member having a plurality of openings through which the charged particles of the densified charged particle layer pass, and a control electrode disposed at least partially around each of the openings; the transport member and the counter electrode;
  • a transfer electrostatic field forming means for providing a potential difference for forming a transfer electrostatic field for transferring the charged particles of the densely packed charged particle layer toward the counter electrode;
  • Voltage control means for applying a voltage to the control electrode of the head member to control the passage of the charged particles through the opening by the transfer electrostatic field, and disposing an image receptor between the head member and a counter electrode.
  • the opening is Is assumed to be configured so that by attaching the charged particles that have passed through.
  • the densification unit includes a pressing member that presses the charged particle layer, and the densification of the charged particles is performed on the charged particle layer by pressing the charged particle layer by the pressing member. What is necessary is just to be comprised. This makes it possible to increase the density of the charged particles in the charged particle layer with a simple configuration.
  • the charged particle layer forming means is configured to apply a charge to the particles by pressing the particles on the conveying member with a predetermined pressing force and to form a charged particle layer. It is preferable that the pressing force of the charged particle layer by the member is set smaller than the particle pressing force of the charged particle layer forming means. That is, when the pressing force of the charged particle layer by the pressing member is equal to or higher than the particle pressing force of the charged particle layer forming means, the layer thickness of the densely packed charged particle layer becomes too thin, and the image density becomes low, and the charged particles are reduced. This is because the adhesive force between the charged particles and the transfer member becomes too high, and the flying response of the charged particles to the voltage applied to the control electrode is reduced.
  • the pressing member is preferably made of a grounded conductive material. In this way, the pressing member does not receive the charge from the charged particles and is not charged, and conversely, does not give the charged particles an electric charge, thereby preventing an unstable state from being electrostatically generated. . More preferably, the pressing member is made of a conductive material to which a voltage having the same polarity as that of the charged particles is applied. By doing so, the charge amount of the charged particles can be more stably maintained.
  • the high-density means has a vibration applying means for vibrating the charged particles of the charged particle layer and rearranging the charged particles on the conveying member. It may be configured to perform the conversion. Thereby, the charged particles can be arranged more uniformly and densely.
  • the vibration applying means may include an ultrasonic vibration source, and a vibration transmitting member that transmits ultrasonic vibration generated by the vibration source to the charged particles of the charged particle layer.
  • a conductive opposing member disposed to face the conveying member with a gap, and an alternating electric field for generating an alternating electric field for vibrating the charged particles of the charged particle layer between the conveying member and the opposing member.
  • an electric field generating means As a result, the charged particles in the charged particle layer can be locally vibrated, and the portion of the charged particle layer facing the opening of the head member can be prevented from vibrating. Can be prevented.
  • the alternating electric field generating means is configured to generate an alternating electric field in which the charged particles of the charged particle layer reciprocate in the entire range between the conveying member and the opposing member. It is good to have. As a result, a high acceleration is applied to the charged particles, so that the aggregated charged particles collide with each other and are crushed well. Further, since the chance of the charged particles coming into contact with the opposing member, the developing roller, and other charged particles increases, the charge amount of the charged particles can be made more uniform.
  • the charged particles can be satisfactorily vibrated and arranged densely, and the defective charged particles can be reliably removed from the charged particle layer.
  • a wiring portion for supplying a voltage to the control electrode of the head member is provided on the head member along a surface of the head member to the facing member along the surface of the head member. It is preferable that a conductive layer is provided so as to extend in the approaching direction, and a conductive layer covering at least the wiring portion is provided on a surface of the head member on the side of the transport member.
  • the charged particles are configured so as to generate an electrostatic field between the conductive layer and the transport member, the electrostatic field moving to the transport member side. This can prevent the floating charged particles from adhering and accumulating on the surface of the head member.
  • a wiring portion for supplying a voltage to the control electrode is provided on the head member, and the wiring portion extends in a direction away from the opposing member along the surface of the head member from the control electrode. Is also good. By doing so, it is possible to prevent the occurrence of crosstalk without providing the conductive layer as described above.
  • the vicinity of the opening of the head member is in contact with the densified charged particle layer, as in the above-described image forming method. It is desirable to set it to ⁇ 50%.
  • FIG. 1 is a cross-sectional view illustrating an image forming apparatus according to Embodiment 1 of the present invention.
  • FIG. 2 is an enlarged cross-sectional view showing a part of the device.
  • FIG. 3 is a plan view showing a part of a head member of the apparatus.
  • FIG. 4 is an enlarged cross-sectional view showing the vicinity of the opening of the head member of the device.
  • FIG. 5 is a bottom view of a part of a head member showing the arrangement of deflection electrodes of the device.
  • FIG. 6 is a plan view showing another example of the shape of the control electrode in the device.
  • FIG. 7 is a cross-sectional view showing an enlarged part of the same device.
  • FIG. 8 is a time chart of the voltage applied to the control electrode of the device.
  • FIG. 9 is an explanatory diagram showing an example of voltage control of the deflection electrode of the same device.
  • FIG. 10 is a plan view showing the arrangement of dots formed using the deflection electrode of the same device.
  • C Fig. 11 shows the case where ultrasonic vibration is applied to the charged toner particles of the charged toner particle layer.
  • FIG. 2 is a diagram corresponding to FIG. y
  • FIG. 12 is a diagram corresponding to FIG. 2 showing the second embodiment of the present invention.
  • FIG. 13 is a diagram corresponding to FIG. 2 showing the third embodiment of the present invention.
  • FIG. 1 shows an image forming apparatus according to Embodiment 1 of the present invention.
  • the image forming apparatus has a housing 1, and a developing roller 2, a supply roller 3, and a regulating blade 4 are provided in the housing 1. Is housed.
  • the developing roller 2 carries toner particles 5 (particles for image formation) as a developer, and is rotated counterclockwise in FIG. 1 at a peripheral speed of, for example, 20 to 40 O mm / sec. It is a transport member that transports to a position facing a counter electrode 6 (opening 16 of the head member 7) described later.
  • the developing roller 2 is formed of a metal or alloy such as aluminum or iron in a cylindrical shape, has a diameter of, for example, about 16 to 18111111, and a thickness of, for example, about 1 mm. In the illustrated example, the developing roller 2 is grounded, but a DC or AC voltage may be applied. Further, the developing roller 2 may be made of synthetic rubber such as urethane and silicon. In this case, the outer diameter of the whole is covered with synthetic rubber over a metal shaft of about 6 to 8 mm so that the outer diameter is 16 to 1. It may be about 8 mm. Further, a belt or the like may be used instead of the roller.
  • the supply roller 3 is brought into contact with the outer peripheral surface of the developing roller 2 and rotates in a direction opposite to the developing roller 2 to supply the toner particles 5 to the developing roller 2 and to remove excess toner particles 5 from the developing roller 2.
  • the supply roller 3 is formed by winding a synthetic rubber (for example, about 2 to 6 mm in thickness) such as urethane foam or silicon around a metal shaft (for example, about 8 mm in diameter) such as iron. It is designed to bite in the range of 0.1 to 2 mm.
  • the supply roller 3 is also grounded, or a DC or AC voltage is applied, similarly to the developing roller 2.
  • the supply roller 3 not only controls the supply amount of the toner particles 5 to the developing roller 2 but also assists the charging of the toner particles 5 due to frictional contact with the developing roller 2 with a peripheral speed difference. Also has a function (toner particles 5 Is mainly performed by a regulating blade 4 described later).
  • the regulating blade 4 presses the toner particles 5 supplied onto the developing roller 2 by the supply roller 5 with a predetermined pressing force, so that many toner particles 5 have the same polarity (either positive or negative).
  • a negative ( ⁇ ) charge is applied, and a charged toner particle layer having a thickness of about 10 to 20 ⁇ m made of the charged toner particles 5 to which the charge is applied is placed on the developing port 2.
  • the regulating blade 4 has one end fixed to a support member of the housing 1.
  • an elastic member 4 made of urethane rubber or the like having a thickness of about 1 mm is attached to the other end of a phosphor bronze plate 4 a having a thickness of about 0.5 mm.
  • the elastic member 4b is applied to the toner particles 5 on the developing roller 2 (see FIG. 2).
  • the pressing force of the regulating blade 4 against the toner particles 5 is preferably 3.5 to 17 g per 1 mm in the longitudinal direction of the developing roller 2. If the pressing force is smaller than 3.5 g / mm, the toner particles 5 are agglomerated and blown out from between the regulating blade 4 and the developing roller 2 to improve the charged toner particle layer. On the other hand, if it is larger than 17 g / mm, the charge amount of the toner particles 5 becomes too high, so that it becomes difficult for the toner particles 5 to fly even when a flying voltage is applied to the control electrode 19 as described later.
  • a conductive plate-shaped opposing member 30 is provided along the circumferential direction of the developing roller 2.
  • the opposing member 30 includes the regulating blade 4 between the developing roller 2 and the opposing member 30.
  • an AC power source 32 as an alternating electric field generating means for generating an alternating electric field for oscillating the charged toner particles 5 of the charged toner particle layer formed on the developing roller 2 is connected. That is, the facing member 30 and the AC power source 32 are charged toner particles of the charged toner particle layer.
  • Vibration means for vibrating 5 and re-arrangement on the developing roller 2 constitute a means for increasing the density of the charged toner particles 5 with respect to the charged toner particle layer by the rearrangement. .
  • This densely packed charged toner particle layer is conveyed to a position facing an opening 16 of a head member 7 described later by the rotation of the developing roller 2.
  • the layer thickness of the densified charged toner particle layer is almost the same as the charged toner particle layer formed by the regulating blade 4 (it tends to be slightly smaller).
  • the opposing member 30 is disposed so as to oppose the developing roller 2 over the entire range in the length direction thereof, and a preferable interval with the developing roller 2 is about 50 to 500 / m. . If the diameter is smaller than 500 ⁇ m, the charged toner particle layer may come into contact with the charged toner particle layer.If the diameter is larger than 500 ⁇ m, it is necessary to apply a high voltage to vibrate the charged toner particles 5. Because there is.
  • the appropriate width of the facing member 30 (length along the circumferential direction of the developing roller 2) is determined by the diameter of the developing roller 2 and the like, but the diameter of the developing roller 2 is 16 to 20 mm. In this case, the diameter is preferably 1 to 10 mm.
  • the AC power supply 32 preferably has a peak amplitude voltage of 1 to 2 kV and a frequency of 1 to 4 kHz. In other words, if the frequency is lower than 1 kHz, the charged toner particles 5 cannot reciprocate over the entire range between the developing roller 2 and the opposing member 30, while the frequency is higher than 4 kHz. However, since the charged toner particles 5 only slightly vibrate on the developing roller 2, the range is 1 to 4 kHz. Thus, the AC power supply 32 generates an alternating electric field in which the charged toner particles 5 of the charged toner particle layer reciprocate in the entire range between the developing roller 2 and the facing member 30. The peak amplitude voltage of the AC power supply 32 needs to be adjusted according to the distance between the developing roller 2 and the facing member 30.
  • reference numeral 6 denotes a counter electrode disposed so as to face a position on the developing roller 2 where the above-described densely charged toner particle layer is conveyed.
  • a head member 7 composed of a flexible print circuit is disposed between the developing roller 2 and the counter electrode 6, and an image receiving member is provided between the head member 7 and the counter electrode 6.
  • the recording paper 9 is transported by the transport belt 10 and passes therethrough. Further, a fixing device 11 for fixing the toner particles 5 attached to the recording paper 9 is provided at a destination of the recording paper 9. Soshi ⁇ L
  • a transfer power source 12 for applying a voltage for transferring the toner particles 5 to the counter electrode 6 is connected to the counter electrode 6.
  • a transfer electrostatic field for transferring the charged toner particles 5 toward the counter electrode 6 is formed between the developing roller 2 and the counter electrode 6. It constitutes forming means.
  • the voltage for this transfer is, for example, 400 to: L500V.
  • FIG. 1 Although only one housing accommodating the developing roller 2 and the like is shown in FIG. 1, for example, when forming a full-color image, four types of toner, yellow, magenta, cyan, and black, are used. The same thing is configured for the particles 5, and they are provided so as to be arranged in a line in the conveying direction of the recording paper 9.
  • the head member 7 includes a base plate 17 having a plurality of openings 16 arranged in the length direction of the developing roller 2, and a base plate 17 side of the developing roller 2.
  • a control electrode 19 provided for each opening 16 on the surface of the base plate 17 and a pair of deflection electrodes 2 provided for each opening 16 on the surface on the opposite side of the base plate 17 (the surface on the side of the counter electrode 6).
  • 0a, 2Ob and a cover coat 2 of an electrically insulating polymer provided to cover the control electrode 19 and the deflection electrodes 20a, 20b from the inner surface of the opening 16 of the base plate 17.
  • each control electrode 19 is connected to a power supply 23 via a voltage control means 22 such as a dry IC.
  • the base plate 17 is formed of, for example, polyimide or the like, has electrical insulation properties, and has a thickness of 25 to 40 ⁇ m.
  • the plurality of openings 16 are for allowing the toner particles 5 to pass through.
  • the openings 16 are arranged in two rows in the length direction of the developing roller 2, and the openings 16 of both rows are aligned with each other in the row direction. It is formed so as to have a positional relationship shifted by half a pitch at a time.
  • the plurality of openings 16 may be arranged in one row, but the arrangement density (dot density) is increased by arranging them in the above-described positional relationship.
  • the control electrode 19 opens and closes the opening 16 electrostatically when an appropriate voltage described later is selectively applied by the voltage control means 22, that is, the charged toner particles 5 are
  • the developing device exposes a transfer electrostatic field passing through the opening 16 between the developing roller 2 and the counter electrode 6 so as to fly away from the developing roller 2 and the counter electrode 6 through the opening 16. Restrict.
  • This control electrode 19 is connected to each opening 16 in the example of FIG. ⁇
  • control electrode 19 It is provided on the entire circumference and is formed in a ring shape.
  • the thickness of the control electrode 19 is set to 5 to 20 m, for example, about 10 zm.
  • wiring portions 18 for supplying a voltage to each control electrode 19 are provided, and each of the wiring portions 18 It extends in the direction away from the opposing member 30 along the surface of the head member 7 from the electrode 19 (the side where the portion near the head member 7 of the developing roller 2 from the control electrode 19 moves by rotation).
  • the leading end is connected to the voltage control means 22.
  • the reason for moving the wiring portion 18 away from the opposing member 30 is that an alternating electric field generated between the developing roller 2 and the opposing member 30 acts on the wiring portion 18 to control the control electrode. This is to prevent the phenomenon that the voltage supplied to 19 is disturbed (so-called crosstalk) from occurring. In other words, when this crosstalk occurs, a normal voltage is not supplied to the control electrode 19 and a disturbed image is printed, but the image is disturbed by moving the wiring portion 18 away from the opposing member 30. Can be prevented.
  • each wiring section 18 is moved from the control electrode 19 along the surface of the head member 7 to approach the opposing member 30 (from the control electrode 19 to the vicinity of the head member 7 of the developing roller 2 being rotated). (The side opposite to the side to move).
  • a conductive layer covering at least the wiring portion 18 may be provided on the surface of the head member 7 on the side of the developing roller 2 (the upper surface of the cover coat 21).
  • the conductive layer functions to shield electrostatically, and crosstalk can be prevented from occurring even when the wiring portion 18 is close to the opposing member 30. It is desirable that the charged toner particles 5 generate an electrostatic field between the conductive layer and the developing roller 2 so as to move toward the developing roller 2.
  • the deflection electrodes 20a and 2Ob deflect the charged toner particles 5 passing through the openings 16 As shown in FIG. 5, they are arranged obliquely to the conveying direction of the recording paper 9 (the direction orthogonal to the 16 rows of the openings), and are provided with the wiring portions 24 and 24, respectively. It is connected to a power supply 26 for deflection via deflection voltage control means 25.
  • the thickness of the deflection electrodes 20a and 20b is set to 5 to 20 m, for example, about 10 m. The manner of deflection will be described later.
  • the force bar coat 21 can be formed by coating an insulating polymer or attaching or depositing an insulating polymer thin film, and has a thickness of, for example, 5 to 2 jum.
  • the total thickness of the head member 7 including the base plate 17, the control electrode 19, the deflection electrode 20, and the force bar coat 21 is preferably, for example, about 80 to 200 im.
  • the opening 16 of the head member 7 is preferably a circle having a diameter of 50 to 200 zm, and more preferably a circle having a diameter of 60 / m or more. In this case, the opening area is 30 ⁇ 30 07 ⁇ (rn 2 ) or more. However, the shape may be an ellipse or a polygon having the same opening area.
  • the major axis / minor axis ratio is preferably 1-2, and when it is polygonal, the number of corners is preferably 4 or more, and the major axis / minor axis ratio is 1-2. Is preferred.
  • the shape of the control electrode 19 can be a circular, oval, or polygonal ring surrounding the opening 16 (a ring shape corresponding to the peripheral shape of each opening 16). However, the ring may be partially missing instead of a complete ring.
  • FIG. 6 shows another example of the shape of the control electrode 19. In this example, both sides of the circular ring (both sides in the arrangement direction of the openings 16) are oriented in the direction of the wiring section 18. It is shaped like a linear cut, that is, narrow. This is advantageous in that a large number of openings 16 (or control electrodes 19) are densely arranged while securing the distance between adjacent control electrodes 19 so as to obtain insulating properties. Dot density increases. '
  • a spacer 13 of 10 to 20 ⁇ m is provided over the entire range in the longitudinal direction of the developing roller 2, and the end of the spacer 13 on the opening 16 side is as described above. It is in contact with the densified charged toner particle layer on the developing roller 2. In other words, the vicinity of the opening 16 of the head member 7 and the high-density zone This means that the toner layer is in contact with the toner layer via the spacer 13. If the shape of the head member 7 is made the same as the shape provided with the spacer 13, the portion near the opening 16 of the head member 7 and the high-density charged toner can be provided without the spacer 13. It can be brought into direct contact with the particle layer.
  • the thickness of the densely packed charged toner particle layer is 10 to 20 ⁇ m and the thickness of the cover coat 21 on the control electrode 19 is 10 to 25 m by the spacer 13,
  • the distance from the surface of the densified charged toner particle layer to the control electrode 19 is maintained at 30 to 65 m.
  • the charged toner particles 5 in the densely packed charged toner particle layer are scraped off at the edge of the opening 16, and the removed toner is removed.
  • the particles 5 may leak out of the openings 16, and if the thickness of the cover coat 21 is reduced and brought close to the cover 5, the possibility of an electrical short circuit between the developing roller 2 and the control electrode 19 increases.
  • the flying responsiveness of the charged toner particles 5 is reduced. Therefore, it is desirable to set it to 30 to 65 ⁇ m.
  • a voltage higher than the voltage value described later can be applied to the control electrode 19 as a flying voltage, there is no problem even if the voltage is set to be larger than 65 / m.
  • the distance between the end of the spacer 13 on the opening 16 side and the opening 16 is preferably 100 m or less, and more preferably 100 m to 400 m.
  • the distance between the opening 16 of the head member 7 and the counter electrode 6 is preferably 50 to 500 m, and more preferably 50 to 30 Om.
  • the end of the above-mentioned head member 7 where the portion near the head member 7 of the developing roller 2 with respect to the opening 16 is moved by rotation is connected to the housing 1 via a tension panel 15.
  • the opposite end is fixed to the housing 1.
  • the contact force is desirably 0.3 to lg per 1 mm in the length direction of the developing roller 2. This is because if the contact force is smaller than 0.3 g / mm, the head member 7 and the densely packed charged toner particle layer do not come into uniform contact with each other in the length direction of the developing roller 2. Opening 16 and denser electrification 1
  • the distance from the toner particle layer that is, the electric field strength is not uniform and the image density unevenness occurs, while if it is larger than 1 g / mm, the charged toner particles 5 in the densely charged toner particle layer are scraped off, If the size of the toner particles becomes excessively large, the densely packed charged toner particle layer directly contacts the opening 16, and the charged toner particles 5 are scraped off at the edge of the opening 16, and the cut toner particles 5 are removed from the opening 16. Because it will pass through.
  • FIG. 8 is a time chart of the voltage applied to the control electrode 19 by the voltage control means 22 when an image signal is externally applied to the voltage control means 22 of the control electrode 19.
  • a transfer voltage Vbe for forming a transfer electrostatic field is applied to the counter electrode 6.
  • the control electrode 19 is supplied with a reference potential Vw.
  • the control voltage Vc of the pulse waveform is applied to the control electrode 19 at time Tb, and the superimposed voltage Vk of the pulse waveform is generated at the same time as the rise of the control voltage Vc. Is applied to the control electrode 19.
  • Vw + Vc (or Vw + Vc + Vk) is moved to the opening 16 to expose the electrostatic field, and the charged toner particles 5 (the opening 1 of the head member 7) of the densified charged toner particle layer are exposed.
  • the flying voltage is such that all the charged toner particles 5) located in the portion corresponding to 6 pass through the opening 16 from the developing roller 2 and fly to adhere to the recording paper 9.
  • the reference potential Vw is a voltage having the same polarity as the charged toner particles 5, and may be, for example, about 150 to 0 V, and particularly preferably about ⁇ 50 V.
  • the control voltage Vc is a voltage having a polarity opposite to that of the charged toner particles 5 and may be, for example, 100 to 400 V, and particularly preferably around 320 V.
  • the superimposed voltage Vk is a voltage having a polarity opposite to that of the charged toner particles 5, and may be, for example, 20 to 150 V, and particularly preferably around 50 V.
  • the time Tb can be set to, for example, 80 s, and the time Tk can be set to, for example, 25 ⁇ s.
  • the application of the superimposed voltage Vk is performed to make it easier to separate the charged toner particles 5 from the developing roller 2.
  • an intermediate voltage between the voltage difference (transfer voltage Vbe) between the developing roller 2 and the counter electrode 6 is given to the control electrode 19 as a flying voltage, so that the opening between the developing roller 2 and the counter electrode 6 is opened.
  • a potential gradient passing through 16, that is, a transfer electrostatic field is formed (exposed), and the charged toner particles 5 of the densely charged toner particle layer are separated from the developing roller 2 and pass through the opening 16.
  • the time Tw until the next pulse of the control voltage Vc for flight enters is a state where only the reference potential Vw is given to the control electrode 19.
  • This reference potential Vw can be the same potential as the developing roller 2, 0 V or a potential higher than that (but lower than Vc), but if it is a negative potential having the same polarity as the charged toner particles 5, Since the developing potential of the developing roller 2 is lower than the ground potential 0 V, a limiting static electric field is generated between the developing roller 2 and the control electrode 19 in a direction opposite to the above-described transfer electrostatic field, and a new charging is performed from the developing roller 2. The flying of the toner particles 5 toward the opening 16 is reliably prevented.
  • a desirable value or a desirable range of each voltage applied to the control electrode 19 described above is when the developing roller 2 is grounded, but when the developing roller 2 is set to a potential other than 0 V. In this case, a voltage is applied to the control electrode 19 so that the voltage difference described above or a voltage difference corresponding to the voltage range is obtained with reference to the potential of the developing roller 2. .
  • the polarity of the charged toner particles 5 is negative, if the polarity is positive, the developing roller 2, the counter electrode 6 and the And the voltage of the control electrode 19 is set.
  • the central part in FIG. 9 shows a case where the same voltage is applied to both the deflection electrodes 20a and 20b, and the charged toner particles 5 pass straight through the opening 16 as shown by the arrow.
  • the recording paper 9 reaches a position corresponding to the position of the opening 16 (no deflection).
  • the left part of the figure shows the right side of the deflection electrodes 20a and 2Ob on the deflection electrode 20a arranged on the left side of the opening 16 with respect to the conveyance direction of the recording paper 9 as a reference.
  • the right part of the figure shows the case where a relatively higher voltage is applied to the right deflection electrode 20b than to the left deflection electrode 20a. Since the voltage is generated between the deflection electrodes 20a and 2Ob, the negatively charged toner particles 5 are deflected to the right.
  • the deflecting electrodes 20a and 2Ob face obliquely to the transport direction of the recording paper 9 as described above, there are three modes, namely, no deflection, left deflection and right deflection as shown in FIG. As shown in FIG. 0, when the recording paper 9 is stopped, three dots 27 that are linearly arranged obliquely to the traveling direction of the recording paper 9 are formed. In this case, by determining the transport speed so that the recording paper 9 is transported by the shift amount (distance) between the adjacent dots 27 and 27 in the cycle (time) at which the recording paper 9 hits the dot 27, the three dots 27 can be linearly arranged in a direction perpendicular to the transport direction A of the recording paper 9. Therefore, three dots 27 can be covered by one opening 16, and the density of dots can be increased.
  • the deflection is performed by controlling the voltage applied to the left and right deflection electrodes 20a and 20b by the voltage control means 25.
  • both electrodes 20a and 2Ob Apply a voltage of 50 V to both, and when deflecting to the left, apply a voltage of 120 V to the left electrode 20 a, apply a voltage of ⁇ 50 V to the right electrode 20 b, and apply a voltage of 50 V to the right.
  • a voltage of ⁇ 50 V is applied to the left electrode 20 a and a voltage of 120 V is applied to the right electrode 20 b.
  • the binder resin used in the production of the toner particles 5 is a polyester resin, a styrene-acrylic copolymer, and a styrene resin. Gen-based copolymers and epoxy resins and their mixed resins are suitable. When magnetic properties are imparted, magnetic powder is further contained. As the magnetic powder, alloys and compounds containing ferromagnetic elements, such as ferrite, magnetite, iron, conoreto, and nickel, are effective. It is appropriate that the coercive force of the magnetic powder is 7958 to 39789 A / m, and the content of the magnetic powder is 20 to 40% by mass ratio to the toner particles 5. Appropriate.
  • the magnetic toner particles 5 may polish a member that comes into contact with the toner particles 5.
  • Non-magnetic is better as it will be rough.
  • the toner particles 5 are subjected to a heat treatment during the manufacturing process of the toner particles 5, the magnetic powder exposed on the toner particles 5 is coated with the binder resin, and the polishing action is performed. Can be reduced. Also, the magnetic powder is coated even if the particle surface after granulation is used.
  • silica (S i O 2) to control the flow of the charge control agent and toner particles 5, titanium oxide (T i 0 2), adding a metal salt of stearic acid from 0.1 to 5% Is preferred.
  • silica greatly affects fluidity, and clogging of the opening 16 of the head member 7 by the toner particles 5 hardly occurs.
  • silica since silica has a small diameter and high chargeability, it easily adheres to the inner wall surface of the opening 16.
  • the attached toner particles 5 play a role as a hole for other toner particles 5, It facilitates the passage of toner particles 5 through openings 16.
  • the specific surface area (by BET method) of such silica for nitrogen adsorption is suitably in the range of 100 to 300 m 2 / g. If silica having a small diameter of less than 100 m 2 / g is used, the resin is mixed so as to be shredded, so that sufficient fixability cannot be obtained. In addition, carbon black or the like is added as a coloring agent in an amount of 5 to 15%.
  • the filling rate of the toner particles 5 before the charge is applied is 31 to 50%. This is because if the filling ratio is less than 31%, the cohesive force between the toner particles 5 is too large, and the density of the charged toner particles 5 cannot be sufficiently increased with respect to the charged toner particle layer. If it is larger than 50%, the cohesive force between the toner particles 5 is too small, and the toner particles 5 are easily separated from the developing roller 2 during transportation. The operation of the image forming apparatus having the above configuration will be described.
  • toner particles 5 are supplied to the developing roller 2 by the supply roller 3, and the supplied toner particles 5 are conveyed to the regulating blade 4 by the developing roller 2, and then pressed by the regulating blade 4 to become negative. While being charged, a charged toner particle layer is formed on the developing roller 2. In this charged toner particle layer, many voids are present, and the charged toner particles 5 are non-uniformly present. In addition, there are also secondary particles having a large particle diameter formed by agglomeration of the charged toner particles 5.
  • the charged toner particles of the charged toner particle layer are charged by an alternating electric field generated between the developing roller 2 and the opposing member 30.
  • Particle 5 vibrates.
  • the charged toner particles 5 vibrate so as to reciprocate in the entire range between the developing roller 2 and the opposing member 30, whereby the charged toner particles are moved to the opposing member 30, the developing roller 2, and other components.
  • the charged toner particles 5 come into contact with each other, and the charged amount of the charged toner particles 5 becomes uniform. Also, the secondary particles collide with each other and are broken into one toner particle 5.
  • the toner particles 5 vibrate, they are rearranged on the developing roller 2 to form a high-density charged toner particle layer.
  • extra voids in the charged toner particle layer are eliminated, and the charged toner particles are arranged in a uniform and dense state, and the surface of the densely charged toner particle layer is smooth.
  • the adhesive force between the charged toner particles 5 and the adhesive force between the charged toner particles 5 and the developing roller 2 are made uniform, and a portion having a weak adhesive force is eliminated.
  • the densely packed charged toner particle layer comes into contact with the head member 7 via the spacer 13 just before the opening 16.
  • This contact further increases the density of the charged toner particles 5 in the densely charged charged toner particle layer, and further smoothes the surface.
  • the charged toner particles 5 in the densely charged toner particle layer are scraped off by this contact, but the charged toner particles 5 in the densely charged toner particle layer are generally high as described above. Since it has an adhesive force, it will not be removed if the contact force is set appropriately as described above.
  • the densified charged toner particle layer is conveyed by the developing roller 2 to a position facing the opening 16 of the head member 7, and when a flying voltage is applied to the control electrode 19, the densified charged toner particle layer
  • the charged toner particles 5 are separated from the developing roller 2 and fly to the recording paper 9 through the opening 16.
  • the density of the charged toner particles 5 is increased with respect to the charged toner particle layer formed on the developing roller 2 by the regulating blade 4, so that the densified charged toner particle layer is formed.
  • the charged toner particles 5 are arranged in a uniform and densely packed state, and the surface of the layer becomes smooth.
  • the charged toner particles 5 are less likely to be separated from the developing roller 2 during transportation, and it is possible to suppress the charged toner particles 5 from being deposited on the head member 7.
  • the amount of the charged toner particles 5 attached to the densified charged toner particle layer is almost the same as the charged toner particle layer formed by the regulating blade 4, so that the image density does not decrease.
  • a line image is formed on the recording paper 9 by using two kinds of toner particles 5 a and 5 b (both having a filling ratio of 31 to 50%) having substantially the same configuration as the first embodiment. (Equivalent to 600 dots along the transport direction in one sheet of recording paper). When printing continuously, the number of apertures varies depending on whether vibration is applied or not. 6 was clogged.
  • an alternating electric field is generated between the developing roller 2 and the opposing member 30 and the charged toner particles 5 are vibrated by the alternating electric field.
  • H z may be applied to the charged toner particles 5 of the charged toner particle layer. That is, as shown in FIG. 11, the ultrasonic vibration source 39 is brought into contact with the facing member 30 and the ultrasonic vibration generated by the vibration source 39 is used to charge the toner of the charged toner particle layer. It may be transmitted to the particles 5.
  • the facing member 30 has a role as a vibration transmitting member for transmitting the ultrasonic vibration to the charged toner particles 5, and for example, a resin film having a thickness of about 100 zm is suitable.
  • the opposing member 30 may be arranged so as to have a gap of 230 ⁇ m with respect to the developing roller 2, but is desirably arranged at a position where the opposing member 30 comes into light contact with the charged toner particle layer.
  • FIG. 12 shows Embodiment 2 of the present invention (in the following embodiments, the same parts as those in FIG. 2 are shown).
  • an alternating electric field is generated between the developing roller 2 and the facing member 30 to vibrate the charged toner particles 5 of the charged toner particle layer.
  • the opposing member 30 is formed in a rotatable roller shape (the charged toner particles 5 can be sufficiently vibrated even if it is not plate-shaped), and the opposing member 30 and the developing roller 2 oppose each other. Rotate so that the moving part moves in the same direction.
  • a scraper 36 is in contact with a portion of the opposing member 30 opposite to the developing roller 2 over the entire range in the length direction of the opposing member 30, and is opposed by the scraper 36.
  • the opposite polarity toner particles 5 attached to the surface of the member 30 are removed. That is, the scraper 36 constitutes a toner particle removing means for removing the toner particles 5 attached to the facing member 30.
  • a DC power supply 33 is connected to the facing member 30 in series to apply a voltage having the same polarity as the charged toner particles 5.
  • a DC power supply 33 is connected to the facing member 30 in series to apply a voltage having the same polarity as the charged toner particles 5.
  • the second embodiment even if the charged toner particles 5 adhere to the surface of the facing member 30, the charged toner particles 5 are conveyed to the scraper 36 and removed by the scraper 36. Is always kept in a clean state, and even when printing is performed for a long time, the operation and effect of the first embodiment can be stably obtained. (When clogging evaluation similar to that of the first embodiment is performed, almost the same effect is obtained.) confirmed) .
  • the opposing member 30 is formed in a rotatable roller shape.
  • the scraper 36 is attached to the opposing member 30 during non-recording. Reciprocating to remove the toner particles 5 attached to the facing member 30. You may.
  • the toner particles 5 adhered to the opposing member 30 as the vibration transmitting member are removed by the scraper 36. To remove it.
  • FIG. 13 shows Embodiment 3 of the present invention, and the method of increasing the density of the charged toner particle layer is different from those of Embodiments 1 and 2. That is, in the third embodiment, instead of the facing member 30 in the first and second embodiments, a pressing member 37 for pressing the charged toner particle layer is provided, and the charged toner particle layer is pressed by the pressing member 37. It is configured to increase the density of the charged toner particles 5 with respect to the charged toner particle layer by pressing.
  • a resin sheet such as PET film, polycarbonate, polyimide, or PTFE, a metal film such as aluminum or iron, or a rubber sheet such as urethane rubber or silicon rubber can be used. It is good to be made of a material and grounded.
  • the pressing member 37 does not receive the charge from the charged toner particles 5 and is not charged, and conversely, does not give the charged toner particles 5 a charge, so that an electrostatically unstable state is obtained. Can be prevented. Further, it is more preferable to apply a voltage ( ⁇ 200 to ⁇ 50 V) of the same polarity (negative) as that of the charged toner particles 5 by using a conductive material. In this way, the charge amount of the charged toner particles 5 can be more stably maintained.
  • the pressing force of the pressing toner particle layer by the pressing member 37 is smaller than the pressing force of the regulating blade against the toner particles 5, and the pressure member near the opening 16 of the head member 7 and the densely charged toner particle layer It is better to set the contact force to be larger than the contact force via the spacer 13. Specifically, the amount is preferably 0.7 to 3.3 g per 1 mm in the length direction of the developing roller 2.
  • the vicinity of the opening 16 of the head member 7 is brought into contact with the high-density charged toner particle layer via the spacer 13.
  • the head may not be in contact with the head member 7 itself or the constituent members on the head member 7.
  • the head member 7 follows the surface position of the developing roller 2 (densified charged toner particle layer) even if the developing roller 2 has a large tolerance such as roundness and runout. Is very preferable because the distance from the surface of the densely charged toner particle layer to the control electrode 19 can be kept constant and various effects can be obtained as described above.
  • the image forming method and the image forming apparatus of the present invention are useful when used in a printing machine such as a computer, a facsimile machine, a copying machine, and the like. Availability is high.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

L'invention concerne un procédé qui met en oeuvre une lame de réglage (4) pour former une couche de particules de virage chargées sur un rouleau de développement (2), et les particules de virage chargées (5) sont densifiées de sorte qu'elles ne puissent pas se séparer du rouleau de développement (2) et obstruer une ouverture (16) d'un élément de tête (7). Un champ électrique alternatif est généré, à travers une lacune, dans l'espace situé entre le rouleau de développement (2) et un élément conducteur (30) opposé au rouleau de développement (2). Le champ électrique alternatif vibre et réorganise les particules de virage chargées (5) sur le rouleau de développement (2). La couche de particules de virage chargées très denses est amenée à la position faisant face à l'ouverture (16) de l'élément de tête (7), et une tension est appliquée sur une électrode de commande autour de l'ouverture en réponse à un signal d'image destiné à disperser les particules de virage chargées très denses (5) depuis le rouleau de développement (2), à travers l'ouverture (16), vers un support-témoin (9) disposé sur le côté opposé au rouleau de développement (2) relativement à l'élément de tête (7).
PCT/JP1999/005593 1999-10-12 1999-10-12 Procede et appareil de formation d'image WO2001026906A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU60069/99A AU6006999A (en) 1999-10-12 1999-10-12 Image forming method and image forming apparatus
PCT/JP1999/005593 WO2001026906A1 (fr) 1999-10-12 1999-10-12 Procede et appareil de formation d'image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/005593 WO2001026906A1 (fr) 1999-10-12 1999-10-12 Procede et appareil de formation d'image

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WO2001026906A1 true WO2001026906A1 (fr) 2001-04-19

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4792512A (en) * 1981-02-25 1988-12-20 Konishiroku Photo Industry, Co., Ltd. Method of developing electrostatic images using two component developer and AC charging
JPH04165350A (ja) * 1990-10-30 1992-06-11 Brother Ind Ltd 現像装置
JPH04238050A (ja) * 1991-01-22 1992-08-26 Brother Ind Ltd 画像形成装置
JPH04278366A (ja) * 1991-03-07 1992-10-02 Brother Ind Ltd 画像形成装置
JPH04292958A (ja) * 1991-03-22 1992-10-16 Brother Ind Ltd 画像形成装置
EP0654714A2 (fr) * 1993-11-05 1995-05-24 Konica Corporation Unité de développement munie d'une plaque de nivellement
JPH08286504A (ja) * 1995-04-11 1996-11-01 Konica Corp 現像装置
JPH08324017A (ja) * 1995-06-05 1996-12-10 Brother Ind Ltd 記録装置
JPH1039622A (ja) * 1996-07-19 1998-02-13 Fuji Xerox Co Ltd 現像方法及びその装置
JPH1039621A (ja) * 1996-07-18 1998-02-13 Fuji Xerox Co Ltd 現像装置
JPH10217531A (ja) * 1997-02-06 1998-08-18 Brother Ind Ltd 画像形成装置
JPH11174845A (ja) * 1997-12-17 1999-07-02 Sharp Corp 現像装置

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4792512A (en) * 1981-02-25 1988-12-20 Konishiroku Photo Industry, Co., Ltd. Method of developing electrostatic images using two component developer and AC charging
JPH04165350A (ja) * 1990-10-30 1992-06-11 Brother Ind Ltd 現像装置
JPH04238050A (ja) * 1991-01-22 1992-08-26 Brother Ind Ltd 画像形成装置
JPH04278366A (ja) * 1991-03-07 1992-10-02 Brother Ind Ltd 画像形成装置
JPH04292958A (ja) * 1991-03-22 1992-10-16 Brother Ind Ltd 画像形成装置
EP0654714A2 (fr) * 1993-11-05 1995-05-24 Konica Corporation Unité de développement munie d'une plaque de nivellement
JPH08286504A (ja) * 1995-04-11 1996-11-01 Konica Corp 現像装置
JPH08324017A (ja) * 1995-06-05 1996-12-10 Brother Ind Ltd 記録装置
JPH1039621A (ja) * 1996-07-18 1998-02-13 Fuji Xerox Co Ltd 現像装置
JPH1039622A (ja) * 1996-07-19 1998-02-13 Fuji Xerox Co Ltd 現像方法及びその装置
JPH10217531A (ja) * 1997-02-06 1998-08-18 Brother Ind Ltd 画像形成装置
JPH11174845A (ja) * 1997-12-17 1999-07-02 Sharp Corp 現像装置

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