摘要:
Based on a video signal, a toner dot counter (802) and an off dot counter (801) detect a size of a toner dot portion to carry an adherent toner thereto and a size of an off dot portion not to carry an adherent toner, respectively. Reference is made to a look-up table (803) based on the detection results, so as to retrieve a coefficient (Kv) corresponding to a combination of the sizes of the toner dot portion and the off dot portion. A count value (Cdot) given by the toner dot counter (802) is multiplied by the coefficient (Kv), while the resultant product is integrated by an accumulator (805). An integration value for an image of one page is multiplied by a coefficient (K0) equivalent to a toner adhesion percentage of solid image. Thus is determined a toner consumption (TC) on the page image.
摘要:
A developing device according to the present invention comprises an image developing roll 4 having a roll surface treated with sand blast treatment to form a rough surface morphology in which aluminum anodizing is also applied to the surface of the image developing roll 4 where the rough surface morphology is formed. To the image developing roll 4 is applied a development bias consisting of a direct current voltage overlapped with an alternate current voltage. In this arrangement, the image developing roll 4 can perform the functions of conveying developer, charging developer, and preventing of discharge of the developing bias, while the image developing roll 4 can be manufactured from a metallic roll such as aluminum roll at a low cost. Moreover, a gradual scraping of the image developing roll 4 surface by external additives of toner 3 suppresses adhering of toner 3 onto the surface of the image developing roll 4, preventing the occurrence of filming.
摘要:
An image forming apparatus has a latent image carrier on which a latent image is formed. A developer carrier conveys a one-component non-magnetic developer and develops the latent image either in close proximity to or in contact with the latent image carrier. A voltage application unit applies an AC-superimposed bias voltage to the developer carrier. A regulating member abuts against the developer carrier to regulate the thickness of the developer layer on the developer carrier. The regulating member has a semiconductive member provided at the distal end thereof to produce an electric potential difference between the semiconductive member and the developer carrier, to which the AC-superimposed bias voltage is applied, when regulating the thickness of the developer layer on the developer carrier, thereby forming a line-shaped uneven conveying surface. Thus, the occurrence of banding and longitudinal unevenness and stripes is prevented, and fogging and scattering are also prevented. Further, the occurrence of filming is prevented, thereby allowing formation of a uniform image free from density unevenness.
摘要:
A developing unit (210) includes a case which accommodates toner containing pigment, a developing roller (211), a supply roller (240) having chamfered ends and formed of an elastic member arranged to be pressed against a surface of the developing roller in such a manner as to supply toner to the surface of the developing roller. Moreover, the ratio or open cells in the elastic supply roller (240) is made to be 30% or higher and depth of engagement of the supply roller to the developing roller is made to be 0.4 mm or smaller. Also a first sealing member is disposed on the side ends of the developing roller and supply roller so as to prevent leakage to the outside portion of the case. The side surfaces of the developing roller have a surface roughness of 0.5 µm or smaller in Rmax. Further, a second sealing member in the form of a film is pressed against a lower surface of the developing roller in order to prevent leakage of toner, wherein a quantity δ of displacement of the sealing member due to its abutment against the developing roller satisfies 0.1 mm
摘要翻译:显影单元(210)包括容纳包含颜料的调色剂的壳体,显影辊(211),具有倒角端部并由弹性构件形成的供应辊(240),所述弹性构件布置成压靠在显影辊的表面上 将调色剂供应到显影辊的表面的方式。 此外,弹性供给辊(240)中的比例或开孔为30%或更高,并且供给辊与显影辊的接合深度为0.4mm或更小。 此外,第一密封构件设置在显影辊和供应辊的侧端,以防止泄漏到壳体的外部。 显影辊的侧表面在Rmax中具有0.5μm或更小的表面粗糙度。 此外,为了防止调色剂泄漏,将薄膜形式的第二密封构件压在显影辊的下表面上,其中密封构件由于其抵靠显影辊而引起的位移量δ满足0.1 mm <δ<0.8mm,第二密封部件的厚度t满足50μm
摘要:
A developing device includes a supply member (3) disposed to rotate in contact with a developer carrier (4) to supply a developer layer having a predetermined thickness to the developer carrier surface. A layer forming member (2) is disposed to abut against the developer carrier to regulate the layer thickness of the developer so as to form a thin developer layer on the developer carrier. A bias application unit (5,6) applies an AC-superimposed bias voltage to the developer carrier. The AC-superimposed bias voltage is formed by superimposing an alternating current on a DC bias voltage. A latent image on a latent image carrier is developed with the thin developer layer formed on the developer carrier by the layer forming member. The bias application unit sets a maximum value of the AC-superimposed bias voltage lower than the charge potential of the latent image carrier, and sets the DC bias voltage lower than the middle between the charge and exposure potentials of the latent image carrier. The minimum value of the AC-superimposed bias voltage may be set lower than the exposure potential of the latent image carrier. The maximum and minimum values of the AC-superimposed bias voltage may be set so as to be identical in polarity with each other.
摘要:
The content of processing of an input image signal varies depending upon the conditions of an apparatus. In view of the fact that this results in the variations of correlation between tone data and toner consumption, a coefficient by which an integration value of the tone data is defined according to the content of the signal processing. In an image forming apparatus which performs tone correction as the signal processing and which has a characteristic (2) of forming images of higher densities relative to tone levels, for example, a larger amount of toner is consumed. Therefore, the coefficient of the apparatus is defined to be a higher value than that of an apparatus having a substantially linear characteristic (1). Conversely, in the case of an apparatus having a characteristic (3) of forming images of lower densities, thus consuming less toner, the coefficient is defined to be a lower value.
摘要:
An image forming apparatus has a latent image carrier on which a latent image is formed. A developer carrier conveys a one-component non-magnetic developer and develops the latent image either in close proximity to or in contact with the latent image carrier. A voltage application unit applies an AC-superimposed bias voltage to the developer carrier. A regulating member abuts against the developer carrier to regulate the thickness of the developer layer on the developer carrier. The regulating member has a semiconductive member provided at the distal end thereof to produce an electric potential difference between the semiconductive member and the developer carrier, to which the AC-superimposed bias voltage is applied, when regulating the thickness of the developer layer on the developer carrier, thereby forming a line-shaped uneven conveying surface. Thus, the occurrence of banding and longitudinal unevenness and stripes is prevented, and fogging and scattering are also prevented. Further, the occurrence of filming is prevented, thereby allowing formation of a uniform image free from density unevenness.
摘要:
An image forming apparatus and method in which a patch image is formed when a toner state information, expressing a state of toner housed in a developer, satisfies a predetermined control start condition. An image forming condition, which influences the density of a developed image, is optimized based on a detected toner density of the toner patch, thereby controlling the image density of the developed images.
摘要:
A development unit comprising a case (230), which accommodates toner therein, a developing roller (211), rotatably supported by the case through a first shaft (212) and a supply roller (240), rotatably supported by the case through a second shaft (241), the supply roller being formed by an elastic member arranged to be pressed against the developing roller in such a manner as to supply the toner to the surface of the developing roller, characterised in that the elastic member is comprised of an expanded material having an open cell ratio of 30% or more, an engagement depth of the supply roller with respect to the developing roller is 0.4mm or less, and the toner has a shape factor SF-1 of 150 or less, and a shape factor SF-2 of 140 or less.