WO2017026221A1 - 画像形成装置 - Google Patents
画像形成装置 Download PDFInfo
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- WO2017026221A1 WO2017026221A1 PCT/JP2016/070627 JP2016070627W WO2017026221A1 WO 2017026221 A1 WO2017026221 A1 WO 2017026221A1 JP 2016070627 W JP2016070627 W JP 2016070627W WO 2017026221 A1 WO2017026221 A1 WO 2017026221A1
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- temperature
- image forming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/47—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0105—Details of unit
- G03G15/011—Details of unit for exposing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/44—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/12—Scanning systems using multifaceted mirrors
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/043—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/14—Electronic sequencing control
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/20—Humidity or temperature control also ozone evacuation; Internal apparatus environment control
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00025—Machine control, e.g. regulating different parts of the machine
- G03G2215/00071—Machine control, e.g. regulating different parts of the machine by measuring the photoconductor or its environmental characteristics
- G03G2215/00084—Machine control, e.g. regulating different parts of the machine by measuring the photoconductor or its environmental characteristics the characteristic being the temperature
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
- G03G2215/0151—Apparatus for electrophotographic processes for producing multicoloured copies characterised by the technical problem
- G03G2215/0158—Colour registration
Definitions
- the present invention relates to an electrophotographic image forming apparatus.
- a tandem type image forming apparatus including a plurality of image forming units
- the relative position of each color toner image formed on the image carrier in each image forming unit is determined by the light emitted from the optical scanning device to the image carrier.
- color misregistration may occur due to expansion and contraction of the optical system member due to temperature change inside the apparatus. Therefore, in the image forming apparatus, color misregistration correction that corrects color misregistration may be executed. In particular, color misregistration correction using different correction tables may be executed when the temperature in the image forming apparatus increases and when the temperature decreases (see, for example, Patent Document 1).
- An object of the present invention is to provide an image forming apparatus capable of correcting a positional deviation of scanning light in the main scanning direction with high accuracy without using an individual correction table according to the situation.
- An image forming apparatus includes a light source, an optical scanning member, a light detection unit, a light source control unit, a scanning lens, a housing, a temperature gradient detection unit, a heater, and a correction.
- the optical scanning member scans light emitted from the light source.
- the light detection unit detects light incident on a predetermined position on a light scanning path by the light scanning member.
- the light source control unit emits light corresponding to the image data of each line from the light source at a predetermined emission start timing every time the light detection unit detects light.
- the scanning lens scans light scanned by the optical scanning member at a constant speed on the image carrier.
- the housing includes the light source, the optical scanning member, the light detection unit, and the scanning lens.
- the temperature gradient detection unit detects a temperature gradient of the casing.
- the heater heats the image carrier or the sheet before image transfer.
- the correction processing unit corrects the emission start timing based on the temperature gradient detected by the temperature detection unit, the environmental temperature detected by the environmental temperature detection unit, and a preset arithmetic expression, The content of the arithmetic expression is changed according to the operating condition of the heater at the start of the image forming process.
- an image forming apparatus capable of correcting a positional deviation of scanning light in the main scanning direction with high accuracy without using an individual correction table according to the situation.
- FIG. 1 is a diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention.
- FIG. 2 is a diagram showing the configuration of the optical scanning device according to the embodiment of the present invention.
- FIG. 3 is a block diagram showing a system configuration of the image forming apparatus according to the embodiment of the present invention.
- FIG. 4 is a diagram for explaining a method for setting an arithmetic expression used in the image forming apparatus according to the embodiment of the present invention.
- FIG. 5 is a diagram for explaining a method for setting an arithmetic expression used in the image forming apparatus according to the embodiment of the present invention.
- FIG. 6 is a diagram for explaining a method for setting an arithmetic expression used in the image forming apparatus according to the embodiment of the present invention.
- FIG. 1 is a diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention.
- FIG. 2 is a diagram showing the configuration of the optical scanning device according to the embodiment of the present invention
- FIG. 7 is a flowchart illustrating an example of a procedure of image formation control processing executed by the image forming apparatus according to the embodiment of the present invention.
- FIG. 8 is a diagram illustrating an example of an execution result of the image formation control process in the image forming apparatus according to the embodiment of the present invention.
- FIG. 9 is a diagram illustrating an example of an execution result of the image formation control process in the image forming apparatus according to the embodiment of the present invention.
- the image forming apparatus 10 includes a plurality of sets of image forming units 1 to 4, an intermediate transfer belt 5, an optical scanning device 6, a secondary transfer roller 7, a fixing device 8, a paper discharge tray 9, a toner container. 11 to 14, a paper feed cassette 21, a conveyance path 22, and an environmental temperature detection unit 23.
- the image forming apparatus 10 is a printer that forms a color or monochrome image on a sheet supplied from the sheet feeding cassette 21 along the conveyance path 22 and discharges the sheet to the sheet discharge tray 9. In the following description, the description may be made using the left-right direction D1, the up-down direction D2, and the front-rear direction D3 defined in each drawing.
- the image forming apparatus 10 includes two optical scanning devices 6 corresponding to the image forming units 1 to 4.
- a configuration in which four optical scanning devices corresponding to each of the image forming units 1 to 4 are individually provided, or a configuration in which one optical scanning device corresponding to the image forming units 1 to 4 is provided is another embodiment. Conceivable.
- a facsimile machine, a copier, a multifunction machine, and the like are also examples of the image forming apparatus according to the present invention.
- the image forming units 1 to 4 are juxtaposed along the intermediate transfer belt 5 and constitute a so-called tandem image forming unit. Specifically, the image forming units 1 to 4 form toner images corresponding to Y (yellow), C (cyan), M (magenta), and K (black).
- the image forming units 1 to 4 are electrophotographic image forming units including a photosensitive drum 31 (an example of an image carrier), a charging unit 32, a developing unit 33, a primary transfer roller 34, and the like.
- an electrostatic latent image corresponding to image data is formed on the photosensitive drum 31 by the light emitted from the optical scanning device 6. . Thereafter, the electrostatic latent image formed on the photosensitive drum 31 is developed with a developer such as toner in the developing unit 33.
- the toner images formed on the photosensitive drums 31 are sequentially transferred to the intermediate transfer belt 5 by the primary transfer rollers 34, respectively. As a result, a color or monochrome toner image is formed on the intermediate transfer belt 5. Thereafter, the toner image on the intermediate transfer belt 5 is transferred to the sheet by the secondary transfer roller 7, melted by the fixing device 8, and fixed to the sheet.
- the image forming units 1 to 4 are provided with a heater 35 (see FIG. 3) that can heat the photosensitive drum 31.
- the heater 35 is, for example, a planar heater in which a resistance element is disposed on a substrate, and is provided in the vicinity of the photosensitive drum 31 in order to heat the photosensitive drum 31.
- a control unit 100 described later heats the photosensitive drum 31 using the heater 35 before starting the image forming process, and evaporates and removes water molecules from the photosensitive drum 31. It has a function.
- the heater 35 is operated in a preset condition such as when the image forming apparatus 10 returns from the power saving mode or when the image forming apparatus 10 is powered on.
- the control unit 100 can switch between enabling and disabling the heater function according to a user operation.
- the environmental temperature detection unit 23 is a thermistor or the like that is provided inside or outside the image forming apparatus 10 and used to detect the environmental temperature of the place where the image forming apparatus 10 is installed.
- the environmental temperature detection unit 23 is provided in the vicinity of an intake port that communicates the inside and the outside of the image forming apparatus 10 and detects the temperature of the outside air as the environmental temperature.
- the optical scanning device 6 scans the photosensitive drum 31 with laser light to form an electrostatic latent image corresponding to image data on the surface of the photosensitive drum 31.
- the optical scanning device 6 includes a light source 61, a polygon mirror 62, a motor 63, an f ⁇ lens 64, a reflection mirror 65, a light detection unit 66, and these components.
- the housing 60 is provided.
- One of the two optical scanning devices 6 is provided with a first temperature detection unit 67, and the other is provided with a second temperature detection unit 68.
- a cover member is mounted on the upper surface of the housing 60 of the optical scanning device 6, but the description of the cover member is omitted in FIG.
- the light source 61 is, for example, a laser diode that emits laser light.
- the polygon mirror 62 has six reflecting surfaces that reflect the two laser beams emitted from the two light sources 61, and is a rotating polyhedral boundary that is rotatably supported by the motor 63.
- the polygon mirror 62 is an example of an optical scanning member.
- the motor 63 is an example of a drive unit that rotates the polygon mirror 62.
- the polygon mirror 62 is rotationally driven by a motor 63 to scan the two laser beams emitted from the two light sources 61 in different directions.
- the scanning direction of the laser beam by the polygon mirror 62 is referred to as a main scanning direction (a direction parallel to the front-rear direction D3 in FIG. 2), and the direction orthogonal to the main scanning direction on the surface of the photosensitive drum 31 is referred to as a sub-scanning direction. .
- the f ⁇ lens 64 is a scanning lens for condensing the laser beam scanned in the main scanning direction by the polygon mirror 62 on the surface of the photosensitive drum 31 as an irradiated body and scanning at a constant speed.
- the four f ⁇ lenses 64 shown in FIG. 2 are scanning lenses corresponding to the four image forming units 1 to 4 of yellow, cyan, magenta, and black in order from left to right in FIG.
- the arithmetic expression may be an expression expressed by the following expression (2).
- the coefficient A2 is a preset coefficient and is the same value as or different from the coefficient A1.
- the temperature T0 is set as a value indicating the temperature detected by the first temperature detection unit 67 when no color misregistration occurs and is stored in the RAM or the like of the control device 100, and when the image forming apparatus 10 is turned off or It is erased when shifting to the power saving mode.
- FIG. 6 shows a calculated color shift amount d1 calculated by substituting the temperature T1 and the temperature T2 detected by the first detection unit 67 and the second detection unit 68 into the above equation (1), and the calculated color.
- a corrected color shift amount d3 indicating a difference (d2-d1) between the shift amount d1 and the detected color shift amount d2 is shown.
- the corrected color misregistration amount d3 is a value indicating the value of the color misregistration amount remaining when the color misregistration correction is performed based on the calculated color misregistration amount d1.
- FIG. 6 shows a calculation result when the coefficient K1 is set to “0.55” and the coefficient K2 is set to “ ⁇ 0.10”.
- the values of the coefficient K1 and the coefficient K2 are the difference between the calculated color shift amount d1 and the detected color shift amount d2 while changing the values of the coefficient K1 and the coefficient K2 using the data of the spreadsheet software shown in FIG. This is a value obtained as a result of searching for the smallest coefficient K1 and coefficient K2. That is, the values of the coefficient K1 and the coefficient K2 are the coefficient K1 and the coefficient K2 when the corrected color shift amount d3 is the smallest.
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- Color Electrophotography (AREA)
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Abstract
Description
続いて、図7を参照しつつ、画像形成装置10において制御部100で実行される画像形成制御処理について説明する。なお、制御部100は、例えば外部のパーソナルコンピューター等の情報処理装置から印刷ジョブを受信した場合に当該画像形成制御処理を実行する。
ステップS1において、制御部100は、画像形成装置10において前記カラーレジストレーションが実行されたときの第1温度検出部67による検出温度が温度T0として設定済みであるか否かを判断する。ここで、温度T0が設定済みでないと判断されると(S1:No)、処理はステップS2に移行し、温度T0が設定済みであると判断されると(S1:Yes)、処理はステップS3に移行する。
ステップS2において、制御部100は、第1温度検出部67を用いて走査レンズ64の温度T1を取得し、その温度T1を温度T0として設定する。即ち、この場合、前記演算式における温度T0に対応する前記基準時期は、当該画像形成処理の開始時となる。これにより、前記カラーレジストレーションが実行される前であっても、現在の温度を基準として、画像形成処理の実行による温度上昇を考慮して色ずれ補正が行われることになり、色ずれが抑制される。
ステップS3において、制御部100は、第1温度検出部67、第2温度検出部68、環境温度検出部23を用いて、現時点の走査レンズ64の温度T1、光検出部66の温度T2、及び環境温度T3を取得する。温度T1及び温度T2は、画像形成装置10における画像形成処理の実行に伴って徐々に上昇し、画像形成終了後には徐々に低下する。
ステップS4において、制御部100は、前記画像形成処理の実行前に加熱ヒーター35が稼動していたか否かを判断する。ここで、加熱ヒーター35が稼働していたと判断されると(S4:Yes)、処理はステップS41に移行し、加熱ヒーター35が稼働していなかったと判断されると(S4:No)、処理はステップS5に移行する。例えば、画像形成装置10では、前記ヒーター機能が有効に設定されている場合に、画像形成処理の開始前に加熱ヒーター35が稼動し、前記ヒーター機能が無効に設定されている場合に、画像形成処理の開始前に加熱ヒーター35が稼動しないことになる。そのため、ステップS4では、前記ヒーター機能の有効又は無効に応じて、前記画像形成処理の実行前における加熱ヒーター35の稼動の有無が判断されてもよい。また、ステップS4では、前記画像形成処理の実行直前の予め設定された所定期間以上前から加熱ヒーター35が稼動していたか否かが判断されてもよい。前記所定期間は、加熱ヒーター35の加熱動作により前記演算式で係数K21、K22を用いることが適切な温度まで上昇したか否かを判断するための指標として予め設定される時間である。
ステップS41において、制御部100は、前記演算式で用いられる係数K1を係数K11に設定し、係数K2を係数K12に設定する。なお、係数K1及び係数K2のいずれか一方のみを変更することも他の実施形態として考えられる。
一方、ステップS5において、制御部100は、前記演算式で用いられる係数K1を係数K21に設定し、係数K2を係数K22に設定する。なお、係数K1及び係数K2のいずれか一方のみを変更することも他の実施形態として考えられる。
ステップS6において、制御部100は、第1温度検出部67及び第2温度検出部68から取得された温度T1及び温度T2と、環境温度検出部23から取得された環境温度T3と、上記(1)式で表れた演算式とに基づいて、算出色ずれ量d1を算出する。これにより、現時点で画像形成ユニット1~4各々によってカラー画像が形成される際に生じる色ずれ量が推定される。
ステップS7において、制御部100は、前記ステップS6で算出された算出色ずれ量d1に基づいて画像形成ユニット1~4各々における前記出射開始タイミングを補正する。なお、係る処理は制御部100の補正処理部102によって実行される。具体的に、本実施形態において、補正処理部102は、画像形成ユニット1~4のうち画像形成ユニット1及び画像形成ユニット3の前記出射開始タイミングを算出色ずれ量d1に基づいて変更する。なお、前記出射開始タイミングは、光検出部66によるレーザー光の検出時からの経過時間によって定められる。
ステップS8において、制御部100は、前記ステップS7で補正された前記出射開始タイミングに基づいて、画像形成ユニト1~4を用いて前記印刷ジョブにおける1回(1枚)の画像形成処理を実行する。より具体的に、前記画像形成処理には、制御部100が、画像形成ユニット1~4各々について、光検出部66によるレーザー光の検出ごとに、前記出射開始タイミングで各ラインの画像データに対応する光を光源61から出射させる処理が含まれる。なお、係る処理は制御部100の光源制御部101によって実行される。
その後、ステップS9において、制御部100は、前記印刷ジョブが終了したか否かを判断する。ここで、前記印刷ジョブが終了するまでの間は(S9:No)、処理が前記ステップS3に戻され、前記印刷ジョブが終了すると(S9:Yes)、当該色ずれ補正処理が終了する。即ち、前記ステップS3~S7における前記出射開始タイミングの補正は、前記印刷ジョブが実行されている間、1回の画像形成処理ごとに実行される。なお、前記ステップS3~S7の処理は、例えば予め設定された数回~数十回(数枚~数十枚)の画像形成処理ごとに実行されることも他の実施形態として考えられる。
Claims (8)
- 光源と、
前記光源から出射される光を走査させる光走査部材と、
前記光走査部材による光の走査経路上の予め定められた位置に入射する光を検出する光検出部と、
前記光検出部による光の検出ごとに、予め設定された出射開始タイミングで各ラインの画像データに対応する光を前記光源から出射させる光源制御部と、
前記光走査部材により走査される光を像担持体上で等速走査させる走査レンズと、
前記光源、前記光走査部材、前記光検出部、及び前記走査レンズが配置される筐体と、
前記筐体の温度勾配を検出する温度勾配検出部と、
前記像担持体又は画像転写前のシートを加熱する加熱ヒーターと、
前記温度検出部によって検出される温度勾配と予め設定された演算式とに基づいて前記出射開始タイミングを補正すると共に、前記演算式の内容を画像形成処理の開始時の前記加熱ヒーターの稼動状況に応じて変更する補正処理部と、
を備える画像形成装置。 - 前記補正処理部が、前記演算式の内容を画像形成処理の開始前に前記加熱ヒーターが稼動していた場合に、前記加熱ヒーターが稼動していなかった場合に比べて前記出射開始タイミングの補正量が小さくなるように前記演算式の内容を変更する請求項1に記載の画像形成装置。
- 前記温度勾配検出部が、前記走査レンズの温度を検出する第1温度検出部と、前記光検出部の温度を検出する第2温度検出部とを含む請求項1に記載の画像形成装置。
- 前記補正処理部は、前記第1温度検出部による検出温度の変化と前記第1温度検出部及び前記第2温度検出部による検出温度の差と前記環境温度検出部によって検出される環境温度とに基づいて前記出射開始タイミングのずれ量を算出し、前記ずれ量に基づいて前記出射開始タイミングを補正する請求項3に記載の画像形成装置。
- 予め定められた基準時期における前記第1温度検出部による検出温度をT0、現在の前記第1温度検出部による検出温度をT1、現在の前記第2温度検出部による検出温度をT2、前記出射開始タイミングのずれ量をd1、予め設定された係数をK1、K2としたとき、
前記補正処理部は、下記(1)式に基づいて、前記出射開始タイミングのずれ量d1を算出する請求項4に記載の画像形成装置。
d1=K1*(T1-T2)+K2*(T1-T0)・・・(1) - 係数K11及び前記係数K11より小さい係数K12が予め設定され、係数K21及び前記係数K21より小さい係数K22が予め設定されており、
前記補正変更処理部は、画像形成処理の開始前に前記加熱ヒーターが稼動していた場合に、前記係数K1を前記係数K11に設定すると共に前記係数K2を前記係数K12に設定し、前記加熱ヒーターが稼動していなかった場合に、前記係数K1を前記係数K21に設定すると共に前記係数K2を前記係数K22に設定する請求項5に記載の画像形成装置。 - 複数の画像形成ユニットと、複数の前記画像形成ユニットに対応する複数の前記走査レンズと、複数の前記画像形成ユニットに対応する複数の前記光検出部とを備え、
前記第1温度検出部が、複数の前記走査レンズのいずれか一つの温度を検出し、
前記第2温度検出部が、複数の前記光検出部のいずれかの一つの温度を検出し、
前記補正処理部が、前記第1温度検出部及び前記第2温度検出部による検出温度と前記演算式とに基づいて、複数の前記画像形成ユニットにおける前記出射開始タイミングを補正する請求項3に記載の画像形成装置。 - 複数の像担持体に対応する前記走査レンズを備える二組の光走査装置を備え、
前記第1温度検出部が、一方の前記光走査装置に設けられており、前記第2温度検出部が、他方の前記光走査装置に設けられている請求項7に記載の画像形成装置。
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