摘要:
Disclosed is an image fixing apparatus for use in an image forming apparatus for forming an image on a recording medium. During a process of continuously forming an image on a plurality of recording media, the recording medium feeding speed is switched when the temperature of a fixing roller has dropped to a particular value which is set depending on the rate at which the temperature of the fixing roller drops.
摘要:
A discharge wire usable in an electrification device includes a tungsten wire subjected to mirror finish processing and an oxidized layer formed by heating the surface of the tungsten wire at a temperature in the range 400 to 600° C., wherein the film has a thickness in the range of 0.01 to 0.3 &mgr;m.
摘要:
In a method for forming an image, an electrification device electrifies an image bearing member to a predetermined potential. An exposure device exposes the electrified image bearing member. A potential detection device detects the potential of the electrified image bearing member and the image bearing member is re-electrified using the electrification device in accordance with a value obtained on the basis of the detected potential. The potential of the re-electrified image bearing member is detected. A value to be applied to the electrification device is determined on the basis of both the detected potential and the redetected potential when a difference between the redetected potential and a target value is great. An image is formed by electrifying the image bearing member in accordance with the determined value. The image forming method may be used to expose and then reexpose an electrified image bearing member, wherein re-exposure is performed using a drive value of an exposure device obtained on the basis of a detected potential after electrifying the image bearing member when a difference between the detected potential and a target value is great.
摘要:
A thin film magnetic head includes an upper core layer and a lower core layer which are made of an Fe—M—O alloy, an Fe—M—T—O alloy or an NI—Fe—X alloy so that the upper core layer has a high saturation magnetic flux density, low coercive force and high resistivity, and the lower core layer has a lower saturation magnetic flux density than the upper core layer, low coercive force, high resistivity, and a low magnetostriction constant. Also the lower core layer is formed so that the thickness gradually decreases toward both side ends, and a gap layer can be formed on the lower core layer to have a uniform thickness. Since the lower core layer is formed by sputtering, a material having excellent soft magnetic material can be used, thereby enabling recording at high frequency.
摘要:
In an information recording/reproducing apparatus, frame synchronization is speedily performed when initialization is executed or the recording surfaces are switched, and the reliability of recorded data is improved. Segment IDs, each being formed by coding an information word representing a rotational angle measured from a rotational angle origin, are provided within the respective servo areas in such a manner that they are spaced equally in the track direction. While initial synchronization is performed, frame synchronization is established based on the information obtained by decoding the segment ID. This eliminates the need for detecting a home index pattern, thereby speedily performing the initial synchronizing operation. After initial synchronization is achieved, it is constantly monitored whether a frame is not out of synchronization based on the information obtained by decoding the segment ID. When it is detected that a frame is out of synchronization, a suitable operation is performed to minimize the destruction of recorded data.
摘要:
A Viterbi decoder corresponding to PR IV system is composed of an even signal sequence processing circuit and an odd signal sequence processing circuit. A branch metric calculating circuit calculates branch metrics with an amplitude reference level R. In each of expressions for calculating the branch metrics, the number of adding operations is described to one or less. By averaging the number of calculations, the calculation speed of branch metrics can be increased. Thus, the overall process speed of the decoder can be increased. In addition, with a limitation of which the LSB of the reference level R is fixed to "0", the bit width of data to be calculated can be decreased. As a result, the number of adders, registers, and so forth can be decreased.
摘要:
An image forming apparatus includes an image bearing member, a latent image forming device for forming an electrostatic latent image on the image bearing member, a first developing device including a first developer carrying member for carrying a first developer thereon to supply it to the image bearing member, a second developing device including a second developer carrying member for carrying thereon a second developer having a different color from that of the first developer to supply it to the image bearing member, wherein a developer carrying surface of the developer carrying member has a surface property which is different from that of the first developer carrying member, and a bias voltage applying device for applying a first developing bias voltage to the first developer carrying member and for applying to the second developer carrying member a second bias voltage which is different from the first developing bias voltage.
摘要:
A control circuit for an air cleaner including a gas sensor, an ultraviolet sensor and a control circuit for performing an automatic operation of the air cleaner in response to the detection of outputs of the sensors. A predetermined number of electrical pulses from the ultraviolet sensor are observed by the control circuit during a first predetermined time period after the passage of a second predetermined time period from a point of time when an initial pulse from the ultraviolet sensor has been inputted to the control circuit, the control circuit identifies the predetermined number of the pulses as a drive signal for initiating the operation of the air cleaner.
摘要:
A method of development including the steps of forming a thin layer of developer on a surface of a developer carrying member; opposing the surface of the developer carrying member to a latent image bearing member bearing a latent image to be developed with a clearance therebetween which is larger than the thickness of the thin developer layer at a developing position; and intermittently forming an alternating electric field, as a developing bias, across the clearance.