摘要:
A laser beam printer includes: a recording medium for forming an image; a scanning unit for scanning a beam modulated by an image signal on the recording medium; a beam detector for detecting the position of the beam scanned by the scanning unit and outputting a synchro signal which defines the record start position on the recording medium; a sheet position detector for detecting the position, in the direction of scanning the beam, of a sheet to which the image formed on the recording medium is transferred; and a controller for controlling the output timing of the synchro signal in accordance with the position of a sheet detected by the sheet position detector.
摘要:
A movable image bearing member is provided with marks for detecting a moving speed of the image bearing member. A sensor detects the speed of movement of the marks. The signal as a result of the detection is compared with a reference signal to determine a phase difference therebetween. A driving motor for driving the image bearing member is controlled to remove the phase difference. Thus, the actual speed of the image bearing member is directly detected, and the speed is controlled so that the moving speed of the periphery of the image bearing member concerned with the image formation is accurately controlled.
摘要:
There is disclosed a sheet feeder for multiple image recording on one or both sides of a sheet. A first sheet feeding mechanism feeds the sheets to a recording station, while a second sheet feeding mechanism refeeds the recorded sheet for second recording, and a control unit regulates the interval of sheet feeding according to the state of the second feeding mechanism, in order to achieve efficient sheet feeding.
摘要:
A safety apparatus for an AC control circuit has a bidirectional thyristor, a photocoupler for detecting a load current, a transistor and a self-hold circuit for checking if a detection output from the photocoupler indicates a failure of the thyristor to commutate or lack of a trigger signal and another transistor which is turned on to blow a fuse and to cut off the load current when a failure of the thyristor to commutate or lack of the trigger signal is detected.
摘要:
A light source stabilizer comprises a light emitting device, a heating element for heating the light emitting device, a temperature sensor for sensing a temperature of the light emitting device, a temperature control circuit for controlling the heating element by the output of the temperature sensor, a light intensity detector for detecting a light intensity of the light emitting device and a light intensity control circuit for controlling the light emitting device by the output of the light intensity detector.
摘要:
A developer bearing member includes a base body, a surface layer, and a plurality of concave portions provided on the surface layer, wherein a resistance value of the surface layer is 102 Ω·cm to 108 Ω·cm, the number of the concave portions per unit area is 2250/mm2 to 12254/mm2, a major diameter of an opening of the concave portion is 8 μm to 20 μm, a depth of the concave portion is 2 μm to 5 μm, a dimensional tolerance of the major diameter is 0.5 μm or less, and a dimensional tolerance of the depth is 0.5 μm or less.
摘要翻译:显影剂承载构件包括基体,表面层和设置在表面层上的多个凹部,其中表面层的电阻值为102Ω·cm至108Ω·cm,凹部的数量 每单位面积为2250 / mm 2〜12254 / mm 2,凹部的开口的大径为8μm〜20μm,凹部的深度为2μm〜5μm,长径的尺寸公差为 0.5μm以下,深度的尺寸公差为0.5μm以下。
摘要:
An image forming apparatus comprises image information which outputs a sync signal and means generated image information synchronously with the sync signal; image forming means form an image on the basis of the image information at either one of a plurality of resolutions and which generates a sync request signal to request a transmission of the sync signal; and a resolution changeover means. When the image forming unit received the resolution change over request signal before the sync request signal is generated, the image forming unit executes the switching operation of the resolution, and if the image forming unit received the resolution changeover request signal after the sync request signal had been generated, the image forming unit does not execute the switching operation of the resolution.
摘要:
An image forming apparatus includes a light beam generator for generating a light beam, a rotational polygon mirror for scanning the light beam generated by the light beam generator across a member to be illuminated, a rotation detector for detecting whether or not the rotational polygon mirror rotates at a predetermined rotation number for an image formation, and a determining device for determining whether or not the rotational polygon mirror rotates at the predetermined rotation number stably in accordance with an output from the rotation detector.
摘要:
An image forming apparatus which converts character or pattern information into bit map information (pixel information) and forms an image based thereon. The image forming apparatus includes a light-beam generator for generating a modulated light beam, a light-beam deflector for scanning an image carrier, a device for feeding a sheet to registration rollers and a driver for driving the image carrier. A time period is provided to operate the light-beam deflector and the feeding device before the driver starts to drive the image carrier to form an image.
摘要:
There is disclosed an electronic apparatus in which signal transmission, for example a command signal from a control unit or a detection signal from a detector, is conducted by light from an emitting unit to a receiving unit. This eliminates signal transmission by cables, thus avoiding complicated wiring operations, preventing noises and reducing the volume of the apparatus.