摘要:
An image forming apparatus includes an image bearing member for bearing an electrostatic latent image; developer carrying member for carrying a developer comprising toner particles; a voltage source for applying to the developer carrying member an oscillating voltage having a predetermined frequency; wherein the following is satisfied:.vertline.Vpp-2Vcont.vertline./16Vf.sup.2
摘要:
A fixing apparatus for heat-fixing a toner image formed on a sheet, includes a roller; an endless belt contacted to the roller; a pressing member contacted to an inner surface of the endless belt and cooperating with the roller to nip the endless belt, wherein the sheet on which the unfixed toner image is formed is heated while being nipped and fed by a nip between the roller and the endless belt, wherein such a surface of the pressing member as is opposed to the inner surface of the endless belt is curved substantially in the same direction as a curved surface of the roller, wherein the nip includes a first nip region in which the belt is not pressed by the pressing member and the endless belt is contacted to the roller by an elastic force of the endless belt which is in a slack state, and a second nip region in which the endless belt is contacted to the roller by pressing of the pressing member, wherein the nip starts with the first nip region with respect to a feeding direction of the sheet, wherein the second nip region is continuous with the first nip region.
摘要:
The image-forming apparatus and an image-forming method of the present invention stably provides a high-quality image having a surface with a uniform gloss value, without reduction in image density, and with good fixability. The image-forming apparatus and image-forming method of the present invention provide are characterized in that white toner or transparent toner is used under the conditions that the storage elastic modulus of the white toner or transparent toner at a saturated temperature in a fixing nip at the time of an fixing step is set to be higher than the storage elastic modulus at a saturated temperature in the fixing nip of each colored toner at the time of the fixing step, and that the storage elastic modulus G′(T) (W) or G′(T) (To) at the saturated temperature in the fixing nip of the white toner or the transparent toner at the time of the fixing step is in the range of 1.0×104 to 1.0×106 dyn/cm2.
摘要翻译:本发明的图像形成装置和图像形成方法稳定地提供具有均匀光泽值的表面的高质量图像,而不降低图像浓度,并具有良好的定影性。 本发明的图像形成装置和图像形成方法的特征在于,在定影辊隙中的饱和温度下的白色调色剂或透明调色剂的储存弹性模量为 定影步骤的时间设定为高于定影步骤时每个着色调色剂的定影辊隙中的饱和温度下的储能弹性模量,并且储存弹性模量G'(T)(W) 或在定影步骤时在白色调色剂或透明调色剂的定影辊隙中的饱和温度下的G'(T)(To)在1.0×10 4至1.0×10 6 dyn / cm 2的范围内。
摘要:
A developing apparatus includes a developer container for containing a developer; a developer bearing member for bearing the developer contained in the developer container, the developer bearing member having a surface layer containing substantially spherical particles, wherein a relation between a weight-average particle diameter r (.mu.m) of a toner in the developer and a volume-average particle diameter R (.mu.m) of the spherical particles satisfies an equation 0.5.ltoreq.R/r.ltoreq.1.9.
摘要:
An image forming apparatus includes an input unit for inputting image data and a converter for converting the input image data into dot information. An image forming circuit controls a scan optical system on the basis of the dot information to form an image. The converter converts the image data into dot information having a screen angle by repeatedly using a predetermined threshold matrix so that the dot information appears preferentially in a sub-scan direction, perpendicular to the main-scan direction of the scan optical system. In the threshold matrix, threshold values are arranged so that their levels increase preferentially in the sub-scan direction.
摘要:
According to embodiments, a heating member or a sliding member arranged in contact with the surface of a fusing roller is moved in an intersecting direction with the rotational direction of the fusing roller in a contact state with the heating member or the sliding member so as to prevent a scratch from being generated on the surface of the fusing roller or to repair the scratch.
摘要:
An image heating apparatus includes a rotatable member; a heater contactable to a surface of the rotatable member to heat the rotatable member; and a back-up member cooperative with the rotatable member to form a nip for nipping and feeding a recording material carrying an image, wherein a position of a peak in a pressure distribution with respect to a rotational direction of the rotatable member is upstream, with respect to the rotational direction, of a central portion of a contact region between the rotatable member and the heater with respect to the rotational direction.
摘要:
The image heating apparatus includes a rotary member that comes into contact with a toner image borne on a recording material, a backup member that forms a nip portion to pinch and convey the recording material with said rotary member, wherein said rotary member heats the toner image on the recording material in the nip portion, a cover member that covers a surface of said rotary member with a gap between the surface of said rotary member and the cover member and a frame that accommodates said rotary member, said backup member and said cover, wherein said cover is not in contact with said frame. This structure can suppress heat dissipation to the exterior of the image heating apparatus, thus suppressing the energy consumption.
摘要:
The present invention provides a fixing apparatus including a rotatable member, a heater for heating the rotatable member, and control means which controls a heat generation of the heater, wherein a toner image on a recording material is heated by the rotatable member, the apparatus has a surface condition changing mode for changing a surface condition of the rotatable member, and, when the surface condition changing mode is selected, the control means controls the heat generation of the heater in such a manner that a surface temperature of the rotatable member becomes equal to or higher than a melting temperature of a surface layer of the rotatable member.
摘要:
A developing apparatus includes a developer carrying member, disposed opposed to an image bearing member, for carrying a developer; a developing bias voltage applying source for applying a developing bias voltage having an oscillating component to the developer carrying member to develop an electrostatic latent image formed on the image bearing member; wherein 10.0.ltoreq.T11/(T11+T12).times.100.ltoreq.90.0, where T11 is a time period of a first step in which an electric field is formed in a direction for directing the developer from the developer carrying member toward the image bearing member in one cycle of the oscillating component of the developing bias voltage applied by the developing bias application source, and T12 is a time period of a third step between the first step and a second step in which an electric field is formed in a direction for directing the developer from the image bearing member to the developer carrying member, and T11/(T11+T12) is an inclination of the developing bias voltage.