초록 ▼

A developing method of the present invention develops a latent image formed on an image carrier with a developing device including at least a developer carrier and a doctor blade. The developer carrier magnetically causes a two-ingredient type developer made up of toner grains and magnetic carrier g

A developing method of the present invention develops a latent image formed on an image carrier with a developing device including at least a developer carrier and a doctor blade. The developer carrier magnetically causes a two-ingredient type developer made up of toner grains and magnetic carrier grains to deposit thereon and conveys it to a developing zone where the developer carrier faces the image carrier. The doctor blade regulates the thickness of the developer forming a layer on the developer carrier. The ratio of a dynamic torque W (kgf·cm) to act on the developer while the developing device is in operation to an amount of toner grains M (g) contained in the developer is selected to be 4.0×10 −2 or below.

대표청구항 ▼

1. In a method of developing a latent image formed on an image carrier with a developing device including at least a developer carrier, which magnetically causes a two-ingredient type developer made up of toner grains and magnetic carrier grains to deposit thereon and conveys said developer to a dev

1. In a method of developing a latent image formed on an image carrier with a developing device including at least a developer carrier, which magnetically causes a two-ingredient type developer made up of toner grains and magnetic carrier grains to deposit thereon and conveys said developer to a developing zone where said developer carrier faces said image carrier, and a doctor blade configured to regulate a thickness of said developer forming a layer on said developer carrier, a ratio of a dynamic torque W (kgf·cm) to act on said developer while said developing device is in operation to an amount of toner grains M (g) contained in said developer is selected to be 4.0×10 −2 or below. 2. The method as claimed in claim 1, wherein the carrier grains contained in the developer have a weight mean grain size of 40 μm or below. 3. The method as claimed in claim 2, wherein an alternating electric field is applied for developing the latent image formed on said image carrier. 4. The method as claimed in claim 1, wherein the toner grains contained in the developer consist at least of toner mother grains made up of a resin and a colorant and an outside substance covering said toner mother grains, anda ratio of a mean amount of charge q 1 /m 1 (μC/g) of said toner mother grains to a mean amount of charge q 2 /m 2 (μC/g) of said toner grains is 0.80 or above. 5. The method as claimed in claim 4, wherein an alternating electric field is applied for developing the latent image formed on said image carrier. 6. The method as claimed in claim 1, wherein the toner grains contained in the developer consist at least of toner mother grains made up of a resin and a colorant and an outside substance covering said toner mother grains, andan amount of the outside substance is 1.0 wt % or above with respect to the toner mother grains. 7. The method as claimed in claim 6, wherein the outside substance consists of at least two kinds of inorganic fine grains. 8. The method as claimed in claim 7, wherein the two kinds of inorganic fine grains are different in mean primary grain size from each other. 9. The method as claimed in claim 8, wherein the inorganic fine grains with a smaller mean primary grain size are larger in amount than the inorganic fine grains with a larger mean primary grain size. 10. The method as claimed in claim 9, wherein the inorganic fine grains of one kind have a mean primary grain size of 0.03 μm or below while the inorganic fine grains of the other kind have a mean primary grain size of 0.2 μm or below. 11. The method as claimed in claim 10, wherein an alternating electric field is applied for developing the latent image formed on said image carrier. 12. The method as claimed in claim 1, wherein an alternating electric field is applied for developing the latent image formed on said image carrier. 13. A developing device comprising:a developer carrier configured to magnetically causes a two-ingredient type developer made up of toner grains and magnetic carrier grains to deposit thereon, and convey said developer to a developing zone where said developer carrier faces said image carrier; anda doctor blade configured to regulate a thickness of the developer forming a layer on said developer carrier;wherein a ratio of a dynamic torque W (kgf·cm) to act on said developer while said developing device is in operation to an amount of toner grains M (g) contained in said developer is selected to be 4.0×10 −2 or below. 14. In an image forming apparatus for forming a latent image and developing said latent image with a developer to thereby produce a corresponding toner image, a developing device comprising:a developer carrier configured to magnetically cause a two-ingredient type developer made up of toner grains and magnetic carrier grains to deposit thereon, and convey said developer to a developing zone where said developer carrier faces an image carrier; anda doctor blade configured to regulate a thickness of the developer forming a layer on said developer carrier;wherein a ratio of a dynamic torque W (kgf·cm) to act on said developer while said developing device is in operation to an amount of toner grains M (g) contained in said developer is selected to be 4.0×10 −2 or below.