EP0332428A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Image forming method
Assignee: Canon Inc
•
Filing: 1989-03-08
•
Granted: —
•
Expires: 2009-03-08
Abstract
Abstract There is provided an image forming method, comprising: gradation-processing an image signal based on a halftone image to output a pulse-width-modulated signal; forming a latent image on a latent image-bearing member on the basis of the pulse-width-modulated signal; and developing the latent image with a developer comprising a toner to reproduce the halftone image; wherein the toner has a volume average particle size of M and comprises toner particles having a particle size of r ; and has a volume-basis distribution such that it comprises 90 % by volume or more of toner particles satisfying M/2 < r < 3/2M and comprises 99 % by volume or more of toner particles satisfying 0 < r < 2M.
Inventors
- 👤 Kenichi Takeda
- 👤 Yuji Sakemi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:11
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0819; G03G13/00; G03G13/01; G03G13/013; G03G13/0133; G03G13/06; G03G13/08; G03G13/09; H; H04; H04N; H04N1/00; H04N1/23; H04N1/29; H04N1/40; H04N1/40025; H04N1/40037; H04N1/405; H04N1/4055; H04N1/4056; H04N1/46; H04N1/50; H04N1/506
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
112 words
An image forming method, comprising: gradation-processing an image signal based on a halftone image to output a pulse-width-modulated signal; forming a latent image on a latent image-bearing member on the basis of the pulse-width-modulated signal; and developing the latent image with a developer comprising a toner to reproduce the halftone image; wherein said toner has a volume-average particle size of M and comprises toner particles having a particle size of r; and has a volume-basis distribution such that it comprises 90 % by volume or more of toner particles satisfying M/2 < r < 3/2M and comprises 99 % by volume or more of toner particles satisfying 0 < r < 2M.
Claim 2
Dependent Claim
112 words
An image forming method, comprising: gradation-processing an image signal based on a halftone image to output a pulse-width-modulated signal; forming a latent image on a latent image-bearing member on the basis of the pulse-width-modulated signal; and developing the latent image with a developer comprising a toner to reproduce the halftone image; wherein said toner has a volume-average particle size of M and comprises toner particles having a particle size of r; and has a volume-basis distribution such that it comprises 90 % by volume or more of toner particles satisfying M/2 < r < 3/2M and comprises 99 % by volume or more of toner particles satisfying 0 < r < 2M.
Claim 3
Dependent Claim
63 words
An image forming method, comprising: gradation-processing an image signal based on a halftone image to output a pulse-width-modulated signal; forming a latent image on a latent image-bearing member on the basis of the pulse-width-modulated signal; and developing the latent image with a developer comprising a toner to reproduce the halftone image; wherein said toner has a volume-average particle size of below 12 microns.
Claim 4
Dependent Claim
63 words
An image forming method, comprising: gradation-processing an image signal based on a halftone image to output a pulse-width-modulated signal; forming a latent image on a latent image-bearing member on the basis of the pulse-width-modulated signal; and developing the latent image with a developer comprising a toner to reproduce the halftone image; wherein said toner has a volume-average particle size of below 12 microns.
Claim 5
Dependent Claim
80 words
An image forming method, comprising: gradation-processing an image signal based on a halftone image to output a pulse-width-modulated signal; forming a latent image on a latent image-bearing member on the basis of the pulse-width-modulated signal; and developing the latent image with a developer to reproduce the halftone image; transferring the halftone image to a transfer material; and fixing the transferred halftone image to the transfer material; wherein the fixed halftone image comprises reproduced dots of about 50 microns or smaller.
Claim 6
Dependent Claim
80 words
An image forming method, comprising: gradation-processing an image signal based on a halftone image to output a pulse-width-modulated signal; forming a latent image on a latent image-bearing member on the basis of the pulse-width-modulated signal; and developing the latent image with a developer to reproduce the halftone image; transferring the halftone image to a transfer material; and fixing the transferred halftone image to the transfer material; wherein the fixed halftone image comprises reproduced dots of about 50 microns or smaller.
Claim 7
Dependent Claim
23 words
A method according to claim 1 or 3, wherein the deveioper comprises a toner having a volume-average particle size of below 12 microns.
Claim 8
Independent Claim
20 words
A method according to any preceding claim, wherein said toner has a volume-average particle size of 9 microns or below.
Claim 9
Independent Claim
20 words
A method according to any preceding claim, wherein said toner has a volume-average particle size of 8 microns or below.
Claim 10
Independent Claim
72 words
A method according to any of claims 2 to 6, wherein said toner has a volume average particle size of M and comprises toner particles having a particle size of r; and has a volume-basis distribution such that it comprises 90 % by volume or more of toner particles satisfying M/2 < r < 3/2M and comprises 99 % by volume or more of toner particles satisfying 0 < r < 2M.
Claim 11
Independent Claim
33 words
A method according to any preceding claim, wherein said latent image is formed by providing to the latent image-bearing member a laser beam of which emission time is controlled by said pulse-width-modulated signal.
Claim 12
Dependent Claim
20 words
A method according to claim 8, wherein said latent image is developed with the developer by a reversal developing method.
Claim 13
Independent Claim
16 words
A method according to any preceding claim, wherein said developer comprises the toner and magnetic particles.
Claim 14
Dependent Claim
19 words
A method according to claim 10, wherein said magnetic particles have a particle size of 30 - 100 microns.
Claim 15
Dependent Claim
19 words
A method according to claim 10, wherein said magnetic particles have a particle size of 40 - 80 microns.
Claim 16
Independent Claim
19 words
A method according to any of claims 10 to 12, wherein said magnetic particles have a resin coating layer.
Claim 17
Dependent Claim
17 words
A method according to claim 13, wherein said magnetic particles comprise ferrite particles coated with a resin.
Claim 18
Independent Claim
23 words
A method according to any of claims 10 to 14, wherein said magnetic particles have an electric resistivity of 10⁷ ohm.cm or larger.
Claim 19
Independent Claim
23 words
A method according to any of claims 10 to 14, wherein said magnetic particles have an electric resistivity of 10⁸ ohm.cm or larger.
Claim 20
Independent Claim
23 words
A method according to any of claims 10 to 14, wherein said magnetic particles have an electric resistivity of 10⁹ to 10¹² ohm.cm.
Claim 21
Independent Claim
16 words
A method according to any preceding claim, wherein the latent image-bearing member comprising a laminate-type photoconductor.
Claim 22
Independent Claim
74 words
A method according to any preceding claim, wherein the latent image is formed by subjecting an original image to color separation, and supplying a laser beam in accordance with the color-separated image to the latent image-bearing member; the latent image is developed with a deveioper comprising a color toner to form a color toner image; and the color toner image is transferred to a transfer material and fixed thereto to form a multi-color image.
Claim 23
Dependent Claim
35 words
A method according to claim 19, wherein the latent image is developed with at least a developer comprising a magenta toner, a deveioper comprising a cyan toner, and a developer comprising a yellow toner, respectively.
Claim 24
Dependent Claim
22 words
A method according to claim 19 or 20, wherein the latent image is further developed with a developer comprising a black toner.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.