JP2009075512A - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP2009075512A
JP2009075512A JP2007246767A JP2007246767A JP2009075512A JP 2009075512 A JP2009075512 A JP 2009075512A JP 2007246767 A JP2007246767 A JP 2007246767A JP 2007246767 A JP2007246767 A JP 2007246767A JP 2009075512 A JP2009075512 A JP 2009075512A
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image forming
forming apparatus
drive system
power supply
timing
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JP5158934B2 (en
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Kazunari Nakano
一成 中野
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Kyocera Document Solutions Inc
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Kyocera Mita Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus that can suppress inrush current during a period from the startup to operation. <P>SOLUTION: When the image forming apparatus is started up, the power supply to a fixing device heater and polygon motor is set in an ON state (SP2) at the timing t1 (SP1); and the power supply to a photoreceptor drum motor is set in an ON state, and the power supply to the polygon motor is set in an OFF state (SP4) at the timing t2 (SP3). At the timing t3 (SP5) when the polygon motor is not stopping completely and rotates by a predetermined rotation frequency α, the power supply to the photoreceptor drum is set in the OFF state and the power supply to the polygon motor is set in the ON state (SP6). At the timing t4 (SP7), the image forming apparatus confirms (SP8) operation status in the polygon mirror. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は画像形成装置に関し、特に、ポリゴンミラーによりレーザビームを感光体上に走査することにより潜像を形成する画像形成装置に関する。   The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus that forms a latent image by scanning a photosensitive member with a laser beam using a polygon mirror.

画像形成装置は、画像形成パターンに応じて光強度変調されたレーザビームを高速回転するポリゴンミラーに照射し、ポリゴンミラーを構成する各光偏向面の瞬時の角度および位置に応じてレーザビームを異なった方向へ反射させることにより、レーザビームを走査し、感光体上に潜像を形成している。その後、潜像に関して現像・定着処理が行われる。   The image forming apparatus irradiates a polygon mirror that rotates at high speed with a laser beam whose light intensity is modulated according to an image forming pattern, and the laser beam varies depending on the instantaneous angle and position of each light deflection surface constituting the polygon mirror. The laser beam is scanned by reflecting in the opposite direction to form a latent image on the photosensitive member. Thereafter, development / fixing processing is performed on the latent image.

このような画像形成装置では、電源投入後あるいは省電力モードから復帰させるとき、定着ヒータをある程度加熱するなどのウォームアップを行ってから、感光体・現像・定着などの駆動系の動作確認を行っている。その後、ポリゴンミラーの動作確認と同時に光源の動作確認を行う。光源の動作確認は、基板の電気回路の動作を確認してから行われる。   In such an image forming apparatus, after turning on the power or returning from the power saving mode, the fixing heater is warmed up to some extent, and then the operation of the drive system such as the photoconductor, development, and fixing is checked. ing. Thereafter, the operation of the light source is confirmed simultaneously with the operation of the polygon mirror. The operation of the light source is confirmed after confirming the operation of the electric circuit of the substrate.

ポリゴンミラーの動作確認は、光源の動作確認と並行して行われており、ポリゴンミラーが定常回転数で回転するまで、光源の動作確認は行われない。このため、ポリゴンミラーの回転数が定常回転数に達するまでの時間を少なくして、印字開始までの時間を短縮することが画像形成装置の性能を表す指標の１つとなっている。   The operation confirmation of the polygon mirror is performed in parallel with the operation confirmation of the light source, and the operation confirmation of the light source is not performed until the polygon mirror rotates at the steady rotation speed. For this reason, reducing the time until the rotation speed of the polygon mirror reaches the steady rotation speed and shortening the time until the start of printing is one of the indexes representing the performance of the image forming apparatus.

特開２００５−１９８４６８号公報（特許文献１）には、ポリゴンミラーを回転させるためのモータの起動時にモータ駆動電源からの出力電圧を基準電位よりも高い高電位に変更して起動を早め、起動後の所望時間経過後はモータ駆動電源からの出力電圧を基準電位に切換えるようにしたモータ制御装置について記載されている。
特開２００５−１９８４６８号公報（要約） Japanese Patent Laying-Open No. 2005-198468 (Patent Document 1) discloses a method for changing the output voltage from a motor driving power source to a higher potential higher than a reference potential at the time of starting a motor for rotating a polygon mirror, thereby speeding up the starting. A motor control device is described in which the output voltage from the motor drive power supply is switched to the reference potential after a later desired time has elapsed.
JP 2005-198468 A (Summary)

しかしながら、モータに基準電位よりも高い電圧を与えると、モータの電気的負荷が大きくなり、コイル、ＩＣなどの電気部品の寿命に悪影響を与えてしまう。また、モータに高い電圧を与えることにより、電流量が増大してしまう。さらに、感光体・現像・定着などの駆動系も含めた突入電流の増大に対しても悪影響を与えてしまう。その結果として、電源投入時のウォームアップ時間の短縮という課題に対して、モータに基準電位よりも高い電圧を与えるだけでは不十分である。   However, if a voltage higher than the reference potential is applied to the motor, the electric load of the motor increases, which adversely affects the life of electrical components such as coils and ICs. In addition, the amount of current increases by applying a high voltage to the motor. In addition, an increase in inrush current including a drive system such as a photoreceptor, development, and fixing is adversely affected. As a result, it is not sufficient to apply a voltage higher than the reference potential to the motor for the problem of shortening the warm-up time when the power is turned on.

そこで、画像形成装置の起動後あるいは省電力モードから復帰させるとき、図６に示すように感光体などの駆動系、定着器ヒータ、ポリゴンモータの電源をＯＮするタイミングをずらすことで突入電流を減らす制御が行われている。図６において、ｔ０１のタイミングで図６（ｂ）に示すように定着器ヒータをＯＮし、ｔ０２のタイミングで図６（ａ）に示すように感光体ドラムモータをＯＮし、ｔ０３のタイミングで感光体ドラムモータをＯＦＦにするとともに、図６（ｃ）に示すようにポリゴンモータをＯＮさせる。タイミングｔ０４において、図６（ｂ）に示すように定着器ヒータをＯＦＦし、図６（ｃ）に示すようにポリゴンモータをＯＦＦにする。   Therefore, when the image forming apparatus is started up or returned from the power saving mode, the inrush current is reduced by shifting the power-on timing of the driving system such as the photosensitive member, the fixing device heater, and the polygon motor as shown in FIG. Control is taking place. In FIG. 6, the fixing device heater is turned on at the timing t01 as shown in FIG. 6B, the photosensitive drum motor is turned on at the timing t02, as shown in FIG. 6A, and the photosensitive drum motor is turned on at the timing t03. The body drum motor is turned off, and the polygon motor is turned on as shown in FIG. At timing t04, the fixing device heater is turned off as shown in FIG. 6B, and the polygon motor is turned off as shown in FIG. 6C.

このように、駆動系を起動するタイミングを異ならせることで、突入電流を減らして図６（ｄ）に示すように、電源装置から流れる電流量の合計値を上限値以下に抑えることができる。しかし、図６に示した従来例では、図６（ｃ）に示すように、タイミングｔ０３でポリゴンモータをＯＮさせているため、図６（ｅ）に示すように、タイミングｔ０４の直前にならなければ、ポリゴンミラーの回転数が定常回転数にならない。このため、ポリゴンミラーの動作確認はタイミングｔ０４以降になり、動作確認に要する時間が長くなってしまう。動作確認後でなければ、実際の感光体自体への書込み動作を行うことができない。タイミングｔ０１においてポリゴンモータをＯＮすれば、ポリゴンミラーの回転数が定常回転数になるまでの時間を短縮できるが、突入電流が大きくなってしまい、合計の電流値が上限値を越えてしまうおそれがある。   In this way, by varying the timing of starting the drive system, the inrush current can be reduced and the total amount of current flowing from the power supply device can be suppressed to the upper limit value or less as shown in FIG. However, in the conventional example shown in FIG. 6, since the polygon motor is turned on at timing t03 as shown in FIG. 6C, it must be immediately before timing t04 as shown in FIG. 6E. For example, the rotation speed of the polygon mirror does not become the steady rotation speed. For this reason, the operation check of the polygon mirror is performed after the timing t04, and the time required for the operation check becomes long. Only after the operation is confirmed, the writing operation to the actual photoreceptor itself cannot be performed. If the polygon motor is turned on at timing t01, the time required for the polygon mirror rotation speed to reach the steady rotation speed can be shortened, but the inrush current increases and the total current value may exceed the upper limit value. is there.

そこで、この発明の目的は、起動時から動作時にいたる突入電流を抑えることができて、光偏向器の回転を早期に立ち上げることが可能な画像形成装置を提供することである。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image forming apparatus capable of suppressing an inrush current from starting to operating and capable of starting up rotation of an optical deflector at an early stage.

この発明は、感光体を駆動する第１の駆動系と、潜像を形成する光偏向器を駆動する第２の駆動系と、第１の駆動系と第２の駆動系のそれぞれの起動タイミングをずらして第１および第２の駆動系の突入電流を減らす制御手段とを含む画像形成装置であって、制御手段は、第２の駆動系を予め起動，起動停止し、光偏向器が停止する前に、第２の駆動系を再起動するように制御する。   The present invention provides a first drive system for driving a photosensitive member, a second drive system for driving an optical deflector for forming a latent image, and respective start timings of the first drive system and the second drive system. And an image forming apparatus including control means for reducing the inrush currents of the first and second drive systems by shifting the control unit, and the control means starts, stops and starts the second drive system in advance, and the optical deflector stops. Before the control, the second drive system is controlled to restart.

好ましくは、制御手段は、光偏向器が所望の回転数以上で回転していることに応じて、第２の駆動系を再起動する。   Preferably, the control unit restarts the second drive system in response to the optical deflector rotating at a desired rotational speed or more.

好ましくは、第１の駆動系は複数設けられており、制御手段は、複数の第１の駆動系をそれぞれ異なるタイミングで複数回起動，起動停止する。   Preferably, a plurality of first drive systems are provided, and the control unit starts and stops the plurality of first drive systems a plurality of times at different timings.

好ましくは、制御手段は、複数の第１の駆動系のそれぞれに流れる突入電流の合計値が上限値を越えないように、複数の第１の駆動系のいずれかと、第２の駆動系の電源とを同期して起動，停止する。   Preferably, the control means includes any one of the plurality of first drive systems and the power supply of the second drive system so that the total value of the inrush currents flowing in each of the plurality of first drive systems does not exceed the upper limit value. Start and stop in synchronization with.

好ましくは、複数の第１の駆動系は、現像ローラの駆動系と、定着の駆動系とを含む。   Preferably, the plurality of first driving systems include a developing roller driving system and a fixing driving system.

好ましくは、所望の回転数は、少なくとも光偏向器の起動時間から決定される。   Preferably, the desired number of rotations is determined from at least the activation time of the optical deflector.

この発明によれば、第１および第２の駆動系のそれぞれの起動，起動停止するタイミングをずらすことにより、起動時から動作時にいたる突入電流を抑えることができ、光偏向器が停止する前に、第２の駆動系を再起動することにより、光偏向器の回転を早期に立ち上げることができる。   According to the present invention, the inrush current from the start to the operation can be suppressed by shifting the start and stop timings of the first and second drive systems, and before the optical deflector stops. By restarting the second drive system, the rotation of the optical deflector can be started at an early stage.

図１はこの発明の一実施形態における画像形成装置のブロック図である。図１において、画像形成装置１は、例えば、デジタル複合機やプリンタやファクシミリ装置などであって、制御手段として作動する制御部２と、制御部２に接続される、読取部３と、操作部４と、表示部５と、印刷部６と、ハードディスク（Ｈａｒｄ Ｄｉｓｋ：ＨＤＤ）７とを含み、さらに各部に電源を供給する電源装置８が設けられている。読取部３は原稿から画像を読取り、操作部４はユーザが操作することによりコピー枚数などを入力する。表示部５はコピーした枚数や選択可能な用紙サイズなどを表示する。   FIG. 1 is a block diagram of an image forming apparatus according to an embodiment of the present invention. In FIG. 1, an image forming apparatus 1 is, for example, a digital multi-function peripheral, a printer, or a facsimile machine, and includes a control unit 2 that operates as a control unit, a reading unit 3 that is connected to the control unit 2, and an operation unit. 4, a display unit 5, a printing unit 6, and a hard disk (HDD) 7, and a power supply device 8 that supplies power to each unit is provided. The reading unit 3 reads an image from a document, and the operation unit 4 inputs the number of copies and the like by a user operation. The display unit 5 displays the number of copies and selectable paper sizes.

印刷部６は、主要な構成として、第１の駆動系としての感光体ドラムモータ９と、定着器ヒータ１０と、第２の駆動系としてのポリゴンモータ１１とを含む。感光体ドラムモータ９は、感光体ドラムを回転駆動する。定着器ヒータ１０は、定着装置を定着温度にするために設けられており、光偏向器に含まれるポリゴンモータ１１はポリゴンミラーを回転させる。   The printing unit 6 includes, as main components, a photosensitive drum motor 9 as a first drive system, a fixing device heater 10, and a polygon motor 11 as a second drive system. The photoconductive drum motor 9 rotates the photoconductive drum. The fixing device heater 10 is provided to bring the fixing device to a fixing temperature, and the polygon motor 11 included in the optical deflector rotates the polygon mirror.

図２は、この発明の一実施形態の画像形成装置における駆動系の電源のオン，オフ動作を説明するためのフローチャートであり、図３は同じく駆動系に供給される電源のオン，オフするタイミングを示す図であり、図４はポリゴンモータ１１を再起動するタイミングを説明するための図である。   FIG. 2 is a flowchart for explaining the power-on / off operation of the drive system in the image forming apparatus according to the embodiment of the present invention. FIG. 3 is a timing for turning on / off the power supplied to the drive system. FIG. 4 is a diagram for explaining the timing for restarting the polygon motor 11.

画像形成装置１を起動あるいは省電力モードから復帰させると、図２に示す処理がスタートする。省電力モードは省電力のために主要な駆動部の電源をＯＦＦ（オフ）にして起動を停止するモードであり、以下、起動とは電源投入時のみならず、省電力モードから復帰する場合も含むものとする。制御部２は、ステップ（図示ではＳＰと略称する）ＳＰ１において、内蔵されているタイマにより予め定める起動時間のタイミングｔ１になったか否かを判別し、ｔ１になったことを判別すると、ステップＳＰ２において、図３（ｂ）に示すように定着器ヒータ１０への電源供給をＯＮ（オン）にするとともに、図３（ｃ）に示すように、ポリゴンミラーの動作確認を行う前に、事前にポリゴンモータ１１への電源供給をＯＮにして起動する。   When the image forming apparatus 1 is activated or returned from the power saving mode, the processing shown in FIG. 2 starts. The power saving mode is a mode in which the power supply of the main drive unit is turned off to stop the power saving in order to save power. Hereinafter, the activation is not only when the power is turned on, but also when returning from the power saving mode. Shall be included. In step SP1 (abbreviated as SP in the figure), the control unit 2 determines whether or not the timing t1 of the predetermined activation time has been reached by a built-in timer, and if it is determined that it has reached t1, step SP2 3B, the power supply to the fixing device heater 10 is turned on as shown in FIG. 3B, and before the operation of the polygon mirror is confirmed as shown in FIG. The power supply to the polygon motor 11 is turned on to start.

この時点において、電源装置８から流れる電流量は、図３（ｄ）に示すようにタイミングｔ１で立上るが、上限値を超えることはない。ここで、上限値とは、電源装置８が供給可能な電流値をいう。定着器ヒータ１０の電源供給がＯＮにされたことで、定着器の温度が定着温度まで上昇する。ポリゴンモータ１１が起動されたことにより、図３（ｅ）に示すように、区間Ａの間にポリゴンミラーの回転数が上昇する。   At this time, the amount of current flowing from the power supply device 8 rises at timing t1 as shown in FIG. 3D, but does not exceed the upper limit value. Here, the upper limit value refers to a current value that can be supplied by the power supply device 8. When the power supply of the fixing device heater 10 is turned on, the temperature of the fixing device rises to the fixing temperature. When the polygon motor 11 is activated, the rotational speed of the polygon mirror increases during the section A as shown in FIG.

ステップＳＰ３において、タイミングｔ２になったか否かを判別し、ｔ２になったことを判別すると、ステップＳＰ４において、図３（ａ）に示すように、感光体ドラムモータ９への電源供給をＯＮするとともに、図３（ｃ）に示すように、ポリゴンモータ１１への電源供給をＯＦＦにする。   In step SP3, it is determined whether or not the timing t2 is reached. When it is determined that the timing t2 is reached, in step SP4, as shown in FIG. 3A, the power supply to the photosensitive drum motor 9 is turned ON. At the same time, as shown in FIG. 3C, the power supply to the polygon motor 11 is turned off.

ステップＳＰ５において、タイミングｔ３になったか否かを判別する。タイミングｔ３になったことを判別すると、ステップＳＰ６において、感光体ドラム９への電源供給をＯＦＦし、ポリゴンモータ１１への電源供給をＯＮさせる。ポリゴンモータ１１への電源供給をＯＮしても、感光体ドラムモータ９への電源供給が遮断されたので、電源装置８の電流量は上限値以下になっている。このように、事前にポリゴンモータ１１を回転させることによって、図３（ｅ）の破線ｋに示すように、事前に起動せずにポリゴンモータ１１が完全に停止している状態から起動する場合に比べて、区間Ｂだけ画像形成装置の起動時間を短縮することができる。   In step SP5, it is determined whether or not the timing t3 has come. When it is determined that the timing t3 is reached, in step SP6, the power supply to the photosensitive drum 9 is turned off and the power supply to the polygon motor 11 is turned on. Even when the power supply to the polygon motor 11 is turned on, the power supply to the photosensitive drum motor 9 is cut off, so that the current amount of the power supply 8 is below the upper limit value. Thus, by rotating the polygon motor 11 in advance, as shown by the broken line k in FIG. 3E, when the polygon motor 11 is started from a completely stopped state without starting in advance. Compared to the section B, the activation time of the image forming apparatus can be shortened.

すなわち、ポリゴンモータ１１が時間Ｔ１で安定して回転させるためには、図４に示すように、ポリゴンモータ１１を再起動する起動時間ΔＴＰＭ＝Ｔ１−ＴＰＭを決定する必要がある。この起動時間ΔＴＰＭは、図３（ｅ）に示すタイミングｔ３において、所望の回転数αで惰性回転するように、区間Ａを定めることによって決定される。なお、この所望の回転数αの設定は、ポリゴンモータ１１の起動時間から決定される。 That is, to the polygon motor 11 rotate stably at time T 1, as shown in FIG. 4, it is necessary to determine the start time ΔT PM = T 1 -T PM to restart the polygon motor 11. The startup time [Delta] T PM at the timing t3 shown in FIG. 3 (e), so that the inertial rotation at a desired rotation number alpha, is determined by determining the interval A. The setting of the desired rotational speed α is determined from the startup time of the polygon motor 11.

ステップＳＰ７において、タイミングｔ４になったか否かを判別する。タイミングｔ４においてポリゴンミラーは定常回転数で回転しているので、ステップＳＰ８において、ポリゴンミラーの動作確認を行うことができ、以後コピーが可能になる。   In step SP7, it is determined whether or not the timing t4 has come. Since the polygon mirror is rotated at the steady rotation speed at the timing t4, the operation of the polygon mirror can be confirmed in step SP8, and the copying can be performed thereafter.

上述のごとく、この実施形態によれば、起動後において、ポリゴンモータ１１をＯＮ，ＯＦＦすることにより、ポリゴンミラーは電源がＯＦＦにされていても惰性である程度回転していることになり、ポリゴンモータ１１が完全に停止していない所望の回転数αで回転しているときに再度ポリゴンモータ１１を再起動するようにしたので、起動確認時にポリゴンミラーの回転数を定常回転数になるまで素早く立ち上げることができる。これにより、ポリゴンミラーの動作確認に要する時間を短縮でき、結果として電源投入時あるいは省電力モードからの復帰時などの待機時より動作にいたる移行時間を短縮できる。   As described above, according to this embodiment, after starting, the polygon motor 11 is turned on and off, so that the polygon mirror rotates to some extent even if the power is turned off. Since the polygon motor 11 is restarted again when the motor 11 is rotating at a desired rotational speed α that is not completely stopped, the rotational speed of the polygon mirror is quickly increased until the steady rotational speed is confirmed at the time of starting confirmation. Can be raised. As a result, the time required for checking the operation of the polygon mirror can be shortened, and as a result, the transition time from the standby time such as when the power is turned on or when returning from the power saving mode can be shortened.

なお、ポリゴンモータ１１の起動時間Ｔ１は、画像形成装置のスペックによって変わるため、画像形成装置の起動時にポリゴンモータ１１の起動時間を測定し、図４の関係を得て、その情報を元に所望の回転数αを算出し、ＨＤＤ７記憶しておけばよい。 Incidentally, activation time T 1 of the polygon motor 11 since they depend specifications of the image forming apparatus, the startup time of the polygon motor 11 is measured at the start of the image forming apparatus, with the relationship of FIG. 4, based on the information The desired rotational speed α may be calculated and stored in the HDD 7.

また、起動時において、感光体ドラムモータ９の電源供給のＯＮ，ＯＦＦと、定着器ヒータ１０の電源供給のＯＮ，ＯＦＦとが同時に行なわれることなく、いずれか一方のＯＮ，ＯＦＦに同期してポリゴンモータ１１の電源供給を複数回ＯＮ，ＯＦＦさせるようにしたので、突入電流を電力容量の上限値を超えないように制御できる。   Further, at the time of start-up, power supply ON / OFF of the photosensitive drum motor 9 and power supply ON / OFF of the fixing device heater 10 are not simultaneously performed, and are synchronized with either ON / OFF. Since the power supply of the polygon motor 11 is turned on and off a plurality of times, the inrush current can be controlled so as not to exceed the upper limit value of the power capacity.

図５は、この発明の他の実施形態における画像形成装置の駆動系に供給される電源のＯＮ，ＯＦＦするタイミングを示す図である。図３に示した実施形態では、感光体ドラムモータ９と、定着器ヒータ１０と、ポリゴンモータ１１を同期させて電源供給のＯＮ，ＯＦＦを制御したのに対して、この実施形態では感光体ドラムモータ９や転写ドラムや転写ローラなどの３個の駆動系Ａ，Ｂ，Ｃと、定着器ヒータ１０と、ポリゴンモータ１１の電源供給のＯＮ，ＯＦＦを同期させて制御する。   FIG. 5 is a diagram showing the timing for turning on and off the power supplied to the drive system of the image forming apparatus according to another embodiment of the present invention. In the embodiment shown in FIG. 3, the photoconductor drum motor 9, the fixing device heater 10, and the polygon motor 11 are synchronized to control ON / OFF of the power supply. In this embodiment, the photoconductor drum is controlled. The three drive systems A, B, and C such as the motor 9, the transfer drum, and the transfer roller, the fixing device heater 10, and the polygon motor 11 are controlled to be turned on and off in synchronization.

すなわち、タイミングｔ１で図５（ｄ）に示すように定着器ヒータ１０と、図５（ｅ）に示すようにポリゴンモータ１１への電源供給をＯＮし、タイミングｔ２で図５（ａ）に示すように駆動系Ａへの電源供給をＯＮし、ポリゴンモータ１１への電源供給をＯＦＦする。タイミングｔ３において、駆動系Ａへの電源供給をＯＦＦし、図５（ｂ）に示すように駆動系Ｂへの電源供給をＯＮし、図５（ｅ）に示すようにポリゴンモータ１１への電源供給をＯＮする。タイミングｔ４において、ポリゴンモータ１１への電源供給をＯＦＦし、図５（ｃ）に示すように駆動系Ｃへの電源供給をＯＮする。   That is, the power supply to the fixing device heater 10 and the polygon motor 11 as shown in FIG. 5 (e) are turned on at timing t1, and the timing shown in FIG. 5 (a) is shown at timing t2. Thus, the power supply to the drive system A is turned on, and the power supply to the polygon motor 11 is turned off. At timing t3, the power supply to the drive system A is turned off, the power supply to the drive system B is turned on as shown in FIG. 5B, and the power to the polygon motor 11 is turned on as shown in FIG. Turn on the supply. At timing t4, the power supply to the polygon motor 11 is turned off, and the power supply to the drive system C is turned on as shown in FIG.

タイミングｔ５において、駆動系Ｃへの電源供給をＯＦＦし、ポリゴンモータ１１への電源供給をＯＮし、タイミングｔ６において、定着器ヒータ１０およびポリゴンモータ１１への電源供給をＯＦＦする。   At timing t5, the power supply to the drive system C is turned off, and the power supply to the polygon motor 11 is turned on. At timing t6, the power supply to the fixing device heater 10 and the polygon motor 11 is turned off.

このように、タイミングｔ１の起動後からタイミングｔ６の期間の間にポリゴンモータ１１への電源供給を３回ＯＮ、ＯＦＦするようにしたので、図５（ｆ）に示すように電源装置８から各構成に供給される突入電流の合計値を上限値以下に抑えることができ、図５（ｇ）に示すように、ポリゴンミラーの回転数を常時定常回転数に近い値に維持することができる。このため、起動後にポリゴンミラーの動作確認を行う際に、ポリゴンミラーは完全に停止しておらず、所望の回転数で回転しているので、定常回転数になるまでの時間を短縮することができ、電源投入時あるいは省電力モードからの復帰時などの待機時より所望の動作にいたる移行時間を短縮できる。   As described above, since the power supply to the polygon motor 11 is turned on and off three times during the period from the start of the timing t1 to the timing t6, each of the power supplies 8 is connected to the polygon motor 11 as shown in FIG. The total value of the inrush current supplied to the configuration can be suppressed to the upper limit value or less, and the rotation speed of the polygon mirror can be constantly maintained at a value close to the steady rotation speed as shown in FIG. For this reason, when the operation of the polygon mirror is checked after startup, the polygon mirror is not completely stopped and is rotated at a desired rotation speed, so that the time required to reach the steady rotation speed can be shortened. In addition, it is possible to shorten the transition time to a desired operation from the standby time such as when the power is turned on or when returning from the power saving mode.

なお、駆動系は４台以上であってもよい。   There may be four or more drive systems.

以上、図面を参照してこの発明の実施形態を説明したが、この発明は、図示した実施形態のものに限定されない。図示された実施形態に対して、この発明と同一の範囲内において、あるいは均等の範囲内において、種々の修正や変形を加えることが可能である。   As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

この発明の一実施形態における画像形成装置のブロック図である。1 is a block diagram of an image forming apparatus according to an embodiment of the present invention. この発明の一実施形態の画像形成装置における駆動系の電源のＯＮ，ＯＦＦ動作を説明するためのフローチャートである。3 is a flowchart for explaining ON / OFF operation of a drive system power supply in the image forming apparatus according to the embodiment of the present invention; この発明の一実施形態の画像形成装置における駆動系に供給される電源のＯＮ，ＯＦＦするタイミングを示す図である。FIG. 4 is a diagram illustrating timings for turning on and off the power supplied to the drive system in the image forming apparatus according to the embodiment of the present invention. ポリゴンモータを起動する時間ΔＴＰＭを説明するための図である。It is a figure for demonstrating time (DELTA) TPM which starts a polygon motor. この発明の他の実施形態における画像形成装置の駆動系に供給される電源のＯＮ，ＯＦＦするタイミングを示す図である。It is a figure which shows the timing which turns ON / OFF the power supplied to the drive system of the image forming apparatus in other embodiment of this invention. 従来の画像形成装置において、感光体ドラムなどの駆動系、定着器のヒータ、ポリゴンモータの電源をＯＮ，ＯＦＦするタイミングをずらす制御を説明するための図である。FIG. 10 is a diagram for explaining control for shifting timings of turning on / off a drive system such as a photosensitive drum, a heater of a fixing device, and a polygon motor in a conventional image forming apparatus.

符号の説明Explanation of symbols

１ 画像形成装置、２ 制御部、３ 読取部、４ 操作部、５ 表示部、６ 印刷部、７ ＨＤＤ、８ 電源装置、９ 感光体ドラムモータ、１０ 定着器ヒータ、１１ ポリゴンモータ。   DESCRIPTION OF SYMBOLS 1 Image forming apparatus, 2 Control part, 3 Reading part, 4 Operation part, 5 Display part, 6 Printing part, 7 HDD, 8 Power supply device, 9 Photosensitive drum motor, 10 Fixing device heater, 11 Polygon motor.

Claims (6)

感光体を駆動する第１の駆動系と、
潜像を形成する光偏向器を駆動する第２の駆動系と、
前記第１の駆動系と前記第２の駆動系のそれぞれの起動タイミングをずらして前記第１および第２の駆動系の突入電流を減らす制御手段とを含む画像形成装置であって、
前記制御手段は、前記第２の駆動系を予め起動，起動停止し、前記光偏向器が停止する前に、前記第２の駆動系を再起動するように制御する、画像形成装置。 A first drive system for driving the photoreceptor;
A second drive system for driving an optical deflector that forms a latent image;
An image forming apparatus including control means for reducing inrush currents of the first and second drive systems by shifting respective start timings of the first drive system and the second drive system;
The image forming apparatus, wherein the control unit starts and stops the second drive system in advance, and controls the second drive system to restart before the optical deflector stops. 前記制御手段は、前記光偏向器が所定の回転数以上で回転していることに応じて、前記第２の駆動系を再起動する、請求項１に記載の画像形成装置。   The image forming apparatus according to claim 1, wherein the control unit restarts the second drive system in response to the optical deflector rotating at a predetermined rotational speed or more. 前記第１の駆動系は複数設けられており、
前記制御手段は、前記複数の第１の駆動系をそれぞれ異なるタイミングで複数回起動，起動停止する、請求項１または２に記載の画像形成装置。 A plurality of the first drive systems are provided,
The image forming apparatus according to claim 1, wherein the control unit starts and stops the plurality of first drive systems a plurality of times at different timings. 前記制御手段は、前記複数の第１の駆動系のそれぞれに流れる突入電流の合計値が上限値を越えないように、前記複数の第１の駆動系のいずれかと、前記第２の駆動系の電源とを同期して起動，起動停止する、請求項３に記載の画像形成装置。   The control means may be configured so that any one of the plurality of first drive systems and the second drive system does not exceed an upper limit value so that a total value of inrush currents flowing through the plurality of first drive systems does not exceed an upper limit value. The image forming apparatus according to claim 3, wherein the image forming apparatus is activated and deactivated in synchronization with a power source. 前記複数の第１の駆動系は、現像ローラの駆動系と、定着駆動系とを含む、請求項３または４に記載の画像形成装置。   5. The image forming apparatus according to claim 3, wherein the plurality of first driving systems include a developing roller driving system and a fixing driving system. 6. 前記所定の回転数は、少なくとも前記光偏向器の起動時間から決定される、請求項２に記載の画像形成装置。
The image forming apparatus according to claim 2, wherein the predetermined number of rotations is determined from at least an activation time of the optical deflector.
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