OPTICAL WRITING DEVICE, IMAGE FORMATION APPARATUS AND LIGHT AMOUNT DETECTION METHOD

• Main Authors: YOKOTA SOTARO, WATANABE YOSHIKAZU, UEMURA TAKANORI
• Format: Patent
• Language: English; Japanese
• Published: 03.06.2021
• Subjects: CINEMATOGRAPHY; CORRECTION OF TYPOGRAPHICAL ERRORS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; MAGNETOGRAPHY; PERFORMING OPERATIONS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; PRINTING; SELECTIVE PRINTING MECHANISMS; STAMPS; TRANSPORTING; TYPEWRITERS

To provide an optical writing device and image formation apparatus which can detect a light amount of an OLED in a short time.SOLUTION: When sequentially detecting light emission amounts of a plurality of light emission elements with a light reception element for light amount correction of the light emission elements in an optical writing device using an OLED as the light emission element, since the OLED has the small emission light amount and the output of the light reception element is weak, waveform rounding is generated in the detection waveform with the amplification. Therefore, the detection potential should be determined after the waveform rounding is resolved. This stand-by time becomes longer as the difference in the detection potentials continuously output by the light reception element is larger. Consequently, the light amount detection time is shortened by lighting up the light emission elements in such an order that it is assumed that the magnitudes of the detection potentials are in the descending order.SELECTED DRAWING: Figure 9 【課題】ＯＬＥＤの光量を短時間で検出することができる光書き込み装置および画像形成装置を提供する。【解決手段】ＯＬＥＤを発光素子とする光書き込み装置における発光素子の光量補正のために、複数の発光素子の発光量を受光素子にて順次検出する場合、ＯＬＥＤは出射光量が少なく、受光素子の出力が微弱であるため、増幅すると検出波形に波形なまりが生じる。このため、波形なまりが解消されるのを待って、検出電位を確定しなければならない。この待ち時間は、受光素子が引き続いて出力する検出電位の差が大きいほど長くなる。このため、本開示では、検出電位の大きさが降順になると推定した順番で発光素子を点灯することによって、光量検出時間を短縮する。【選択図】図９