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Exposure device, light-emitting device, image forming apparatus and failure diagnosing method

A technology of exposure device and light-emitting element, which is applied to the electrical recording process using the charge pattern, equipment and optics of the electric recording process using the charge pattern, and can solve problems such as light-emitting failures and image loss, and achieve reliable transfer of failures and simplify structure effect

Inactive Publication Date: 2013-05-29
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, if a transfer failure of a switching element occurs in the light emitting element array, the transfer failure may cause a light emitting failure of a light emitting element that would emit light in normal operation, resulting in image loss

Method used

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  • Exposure device, light-emitting device, image forming apparatus and failure diagnosing method
  • Exposure device, light-emitting device, image forming apparatus and failure diagnosing method
  • Exposure device, light-emitting device, image forming apparatus and failure diagnosing method

Examples

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Embodiment Construction

[0038] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0039] figure 1 An overall configuration example of an image forming apparatus 1 to which the exemplary embodiment is applied is shown. The image forming apparatus 1 includes an image forming processing unit 10 and a controller 20 . The image formation processing unit 10 forms images respectively corresponding to image data sets of different colors. A controller 20 connected to an external device such as a personal computer (PC) 2, or an image reading device 3 or a FAX (facsimile machine) modem 4 performs image processing on image data received from the above devices, and controls the entire image forming device 1 operation.

[0040] The image forming processing unit 10 includes four image forming units 11 (specifically, 11Y, 11M, 11C, and 11K) arranged at regular intervals. Each image forming unit 11 includes a photosensitive drum 1...

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Abstract

The exposure device includes: a light output device outputting light for exposing a charged image carrier, and including light-emitting elements caused to emit light or not through a control using a light-emission signal, switch elements provided corresponding to the light-emitting elements, and sequentially turned on to set the light-emitting elements ready to emit light, a transfer-signal generating unit generating a transfer signal for sequentially turning on the switch elements, a light-emission signal supply unit supplying the light-emission signal to the light-emitting elements, and a detection unit causing the transfer-signal generating unit to generate a transfer signal having cycles whose number is larger than that of the light-emitting elements, and detecting a potential of an output region of the light-emission signal supply unit while making an output from the light-emission signal supply unit high impedance; and an optical member focusing light outputted by the light output device onto the image carrier.

Description

technical field [0001] The present invention relates to an exposure device including a plurality of light emitting elements, a light emitting device, an image forming device, and a fault diagnosis method. Background technique [0002] In recent years, the following types of exposure devices for exposing the outer surface of an image carrier such as a photosensitive drum have been employed in electrophotographic image forming devices such as printers or copiers. The exposure apparatus includes a light emitting element array in which light emitting elements such as light emitting diodes (LEDs) are arranged in a row (or column). [0003] A conventional technique called a self-scanning light-emitting element array is disclosed in a patent publication (for example, see Japanese Patent Application Laid-Open No. 2007-125785). This self-scanning light-emitting element array uses thyristors (transfer thyristors) as switching elements for making LEDs of light-emitting chips emit ligh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/447G03G15/00
CPCB41J2/451
Inventor 土屋健
Owner FUJIFILM BUSINESS INNOVATION CORP
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