JPH08101609A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH08101609A JPH08101609A JP6237941A JP23794194A JPH08101609A JP H08101609 A JPH08101609 A JP H08101609A JP 6237941 A JP6237941 A JP 6237941A JP 23794194 A JP23794194 A JP 23794194A JP H08101609 A JPH08101609 A JP H08101609A
- Authority
- JP
- Japan
- Prior art keywords
- main control
- control unit
- control part
- power
- saving mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、消費電力低減のために
処理の行われていない待機時に装置各部への電源供給を
遮断したり、供給電流を低下させる省電力モードを有す
る画像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus having a power saving mode in which the power supply to each part of the apparatus is cut off or the supply current is reduced during standby when no processing is performed to reduce power consumption. .
【０００２】[0002]
【従来の技術】近年地球環境保護が重視され、省資源の
観点からも電気機器の低消費電力化が望まれている。と
ころがオフィスにおいては作業効率向上のために多数の
ＯＡ機器が導入され、しかもＯＡシステムは年々大規模
化しているため、そのトータルの消費電力はかなり大き
なものとなっている。ところで、複写機やレーザプリン
タ等の画像形成装置は常に本来の印字作業を行っている
わけではなく、待機状態となっている時間の方が長い場
合が多い。そこで、待機時には定着ヒータの設定温度を
下げたり、ポリゴンモータの回転を止める等の制御をし
て、省電力化を図った機器が実用化されている。2. Description of the Related Art In recent years, protection of the global environment has been emphasized, and it has been desired to reduce electric power consumption of electric equipment from the viewpoint of resource saving. However, in offices, a large number of OA devices have been introduced to improve work efficiency, and the OA system has become large in scale year by year, so that the total power consumption thereof is considerably large. By the way, an image forming apparatus such as a copying machine or a laser printer does not always perform the original printing work, and the standby time is often longer. In view of this, a device that has been put into practical use has been put into practical use by controlling the setting temperature of the fixing heater and stopping the rotation of the polygon motor during standby.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
省電力制御はヒータやモータ、表示部程度にとどまって
おり、演算処理素子（以下、ＣＰＵという）やメモリそ
の他周辺素子にまでは及んでいなかった。近年、これら
の回路はクロックスピードの上昇や大規模化によって消
費電力が増加しており、電力消費源として無視できない
存在となっている。この部分の消費電力を抑えるために
はＣＰＵを停止させることが考えられるが、そうすると
外部機器との通信を行うことができず、例えばプリンタ
においてはホストコンピュータからの印字指令を受け付
けることができなくなるという問題があった。However, the conventional power saving control is limited to the heater, the motor, and the display unit, and does not extend to the arithmetic processing element (hereinafter referred to as CPU), the memory and other peripheral elements. It was In recent years, the power consumption of these circuits has increased due to an increase in clock speed and an increase in scale, and they have become non-negligible sources of power consumption. Although it is conceivable to stop the CPU in order to reduce the power consumption of this portion, if this is done, communication with an external device cannot be performed, and for example, the printer cannot receive a print command from the host computer. There was a problem.
【０００４】本発明は上記の点に鑑みてなされたもので
あり、省電力モードを有する画像形成装置において、Ｃ
ＰＵ、メモリ等における消費電力を低減し、更なる省電
力を実現することを目的とする。また、省電力モード中
の外部機器からの受信データの取りこぼしを防止するこ
とを他の目的とする。The present invention has been made in view of the above points, and in an image forming apparatus having a power saving mode, C
It is an object of the present invention to reduce power consumption in PUs, memories, etc. and realize further power saving. Another object is to prevent the reception data from being lost from the external device in the power saving mode.
【０００５】[0005]
【課題を解決するための手段】本発明は上記の点に鑑み
てなされたものであり、処理の行われていない待機時に
装置各部への電力供給を低減もしくは遮断して電力消費
の低減を図る省電力モードを有する画像形成装置におい
て、装置各部を制御するメイン制御部と、外部機器との
インターフェイスを制御するサブ制御部とを設け、スタ
ンバイモード中は上記メイン制御部を停止しサブ制御部
のみ動作するように構成したものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and aims to reduce power consumption by reducing or interrupting power supply to each part of the apparatus during standby when no processing is being performed. In an image forming apparatus having a power saving mode, a main control section for controlling each section of the apparatus and a sub control section for controlling an interface with an external device are provided, and during the standby mode, the main control section is stopped and only the sub control section is provided. It is configured to work.
【０００６】また、上記サブ制御部は記憶手段を有し、
スタンバイモード中に外部機器からのデータを受ける
と、記憶手段にデータ記憶を開始すると共に上記メイン
制御部を復帰させるようにしたものである。The sub-control unit has a storage means,
When data is received from an external device in the standby mode, the storage of data in the storage means is started and the main control section is restored.
【０００７】[0007]
【作用】上記第１の発明によれば、省電力モード中は高
性能なＣＰＵや大容量のメモリを含むメイン制御部を停
止しサブ制御部のみを動作させるので、制御部における
消費電力を低減させることができる。According to the first aspect of the invention, during the power saving mode, the main control unit including the high-performance CPU and the large-capacity memory is stopped and only the sub-control unit is operated, so that the power consumption in the control unit is reduced. Can be made.
【０００８】また、上記第２の発明によれば、メイン制
御部が動作可能になるまではサブ制御部内の記憶手段に
受信データを記憶させておくので、メイン制御部の立ち
上がり前にデータ受信を開始してもデータの取りこぼし
がなくなる。Further, according to the second aspect of the invention, since the reception data is stored in the storage means in the sub-control unit until the main control unit becomes operable, the data reception is performed before the rising of the main control unit. Even if it starts, there will be no missing data.
【０００９】[0009]
【実施例】以下、この発明の実施例を添付図面に基づい
て具体的に説明する。図１は本発明による画像形成装置
であるプリンタのブロック構成図である。プリンタ１は
ホストコンピュータ１３とインターフェイス部３を介し
て接続されており、インターフェイス部３は省電力モー
ド時に通信制御を司るサブＣＰＵ１１及び受信したデー
タを保持しておくメモリ１２により構成されている。こ
のサブＣＰＵ１１及びメモリ１２は本発明のサブ制御部
に相当するものである。メイン制御部２はプリンタ１全
体の制御を行い、メインＣＰＵ５、制御プログラムを格
納しているＲＯＭ６、一時的なデータを保存するＲＡＭ
７から成る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a block diagram of a printer which is an image forming apparatus according to the present invention. The printer 1 is connected to a host computer 13 via an interface unit 3, and the interface unit 3 is composed of a sub CPU 11 that controls communication in the power saving mode and a memory 12 that holds received data. The sub CPU 11 and the memory 12 correspond to the sub control unit of the present invention. The main control unit 2 controls the entire printer 1, and includes a main CPU 5, a ROM 6 that stores a control program, and a RAM that stores temporary data.
It consists of 7.
【００１０】電源コントローラ４はＣＰＵ５または１１
からの指示によりプリンタ各部への電力供給を制御す
る。操作部８は、ユーザが印刷枚数や濃度、フォントの
選択といった各種の印刷条件を設定する操作キー部と、
設定状態やガイダンス等を表示するＬＣＤ表示部とから
成る。作像部９は、給紙部、印字部、現像部、転写部、
排紙部から成り、メイン制御部２からの指示を受けて、
受信した画像データを周知の電子写真方式によって記録
紙上に印刷する。各ユニットは共通データバス１０を介
して接続されている。The power controller 4 is a CPU 5 or 11
The power supply to each part of the printer is controlled by an instruction from the. The operation unit 8 includes an operation key unit for the user to set various printing conditions such as the number of prints, density, and font selection.
An LCD display unit for displaying the setting status, guidance, etc. The image forming unit 9 includes a paper feeding unit, a printing unit, a developing unit, a transfer unit,
It consists of a paper ejection unit, and receives instructions from the main control unit 2.
The received image data is printed on recording paper by a known electrophotographic method. Each unit is connected via a common data bus 10.
【００１１】ここでメイン制御部２とサブ制御部である
サブＣＰＵ１１及びメモリ１２の役割について説明す
る。メイン制御部２はホストコンピュータ１３から受信
したデータのビットマップへの展開、定着部の温度制
御、レーザ光量の安定化、紙搬送のタイミング制御等、
様々な処理を高速に行う必要があるため、１６ビットあ
るいは３２ビットといった高性能なＣＰＵを使用し、ク
ロック周波数も高速なものが求められる。またメモリに
ついても画像データを蓄積・展開するために大容量のも
のが必要であり、またコストとの兼ね合いからＤＲＡＭ
が用いられることが多い。このようにメイン制御部は大
規模かつ高性能な回路が組まれるため、必然的に消費電
力も大きなものとなる。The roles of the main controller 2, the sub CPU 11 as the sub controller, and the memory 12 will now be described. The main controller 2 develops the data received from the host computer 13 into a bitmap, controls the temperature of the fixing unit, stabilizes the amount of laser light, controls the timing of paper conveyance, etc.
Since it is necessary to perform various processes at high speed, a high-performance CPU such as 16-bit or 32-bit is used, and a high clock frequency is required. In addition, a memory with a large capacity is required to store and expand image data, and DRAM is used in consideration of cost.
Is often used. As described above, since the main control unit is built with a large-scale and high-performance circuit, power consumption is inevitably large.
【００１２】これに対しサブ制御部はホストコンピュー
タとのデータ授受のみを行えば良いため、ＣＰＵは８ビ
ット程度のものでも十分である。更にメモリ１２は、メ
イン制御部２が立ち上がって動作可能になるまでの間に
ホストコンピュータ１３から受信したデータを保持して
おけば良いから小さな容量で済み、またＳＲＡＭやＮＶ
ＲＡＭを使えばリフレッシュ動作が不用になるため更に
電力消費を抑えることができる。On the other hand, the sub-control unit only needs to send and receive data to and from the host computer, so that a CPU having about 8 bits is sufficient. Further, the memory 12 need only hold the data received from the host computer 13 until the main control unit 2 starts up and becomes operable.
If the RAM is used, the refresh operation becomes unnecessary, so that the power consumption can be further suppressed.
【００１３】次に、省電力モードに入る場合の動作を図
２のフローチャートを参照して説明する。図２はメイン
ＣＰＵ５における処理であり、ホストコンピュータから
のデータ受信が終了してから一定時間（例えば３分）が
経過すると省電力モードに入るべく、以後の処理を行う
（ステップＳ１）。なお、ここではデータ受信終了から
の時間により省電力モードに入るようにしているが、印
刷動作或いはユーザの操作が終了した時点からの経過時
間によっても良いし、特定のキー操作によることもでき
る。省電力モードに入る場合、まずサブＣＰＵ１１の駆
動を開始し（ステップＳ２）、以後はサブＣＰＵ１１が
ホストコンピュータ１３からのデータ受信処理を行う。
次に電源コントローラ４をＯＦＦし、装置各部への電源
供給を遮断する（ステップＳ３）。但し、インターフェ
イス部３のみは図示しない別電源により駆動される。こ
れによりメインＣＰＵ５も停止し、以後、省電力モード
に入る。Next, the operation for entering the power saving mode will be described with reference to the flowchart of FIG. FIG. 2 shows a process in the main CPU 5, and after a lapse of a fixed time (for example, 3 minutes) from the end of data reception from the host computer, the subsequent process is performed to enter the power saving mode (step S1). Although the power saving mode is entered depending on the time from the end of data reception here, the power saving mode may be changed depending on the elapsed time from the end of the printing operation or the user's operation or a specific key operation. When entering the power saving mode, first the driving of the sub CPU 11 is started (step S2), and thereafter, the sub CPU 11 performs the data reception process from the host computer 13.
Next, the power supply controller 4 is turned off to cut off the power supply to each part of the device (step S3). However, only the interface unit 3 is driven by another power source (not shown). As a result, the main CPU 5 also stops, and thereafter the power saving mode is entered.
【００１４】省電力モード中はインターフェイス部３の
サブＣＰＵ１１とメモリ１２以外の電源供給は遮断され
ている。この状態でホストコンピュータ１３から印字指
令が送られてくると、省電力モードの解除を行う。この
時の動作を図３及び図４のフローチャートを参照して説
明する。During the power saving mode, the power supply to the sub CPU 11 and the memory 12 of the interface unit 3 is cut off. When a print command is sent from the host computer 13 in this state, the power saving mode is released. The operation at this time will be described with reference to the flowcharts of FIGS.
【００１５】図３はサブＣＰＵにおける処理であり、ホ
ストコンピュータ１３から印字要求があると、省電力モ
ードを解除すべく以後の処理を行う（ステップＳ１
０）。印字要求を受けた場合、サブＣＰＵ１１はホスト
コンピュータ１３を待たせることなくデータの受信を開
始する（ステップＳ１１）。この時点ではまだ省電力モ
ード中でありメイン制御部２は動作可能になっていない
ので、受信したデータはメモリ１２に格納していく。こ
れにより、メイン制御部２が立ち上がる前でもデータ受
信が可能になり、且つ受信データの取りこぼしもなくす
ことができる。次に電源コントローラ４をＯＮにして装
置各部への電源供給を開始し、メインＣＰＵ５の駆動を
始める（ステップＳ１２、Ｓ１３）。電源供給が開始さ
れてもメイン制御部２（メインＣＰＵ５、ＲＡＭ７）は
すぐには動作可能（受信データを受け付けられる状態）
にはならないため、メイン制御部２が動作可能になるま
でループを繰り返し、メイン制御部２からＯＫの信号を
受けるとサブＣＰＵ１１は停止し省電力モードを終了す
る（ステップＳ１４、Ｓ１５）。FIG. 3 shows the processing in the sub CPU. When a print request is issued from the host computer 13, the following processing is performed to cancel the power saving mode (step S1).
0). When receiving the print request, the sub CPU 11 starts data reception without causing the host computer 13 to wait (step S11). At this point, the power saving mode is still in effect and the main controller 2 is not operable, so the received data is stored in the memory 12. As a result, it becomes possible to receive data even before the main control unit 2 is started up, and it is possible to prevent missing of received data. Next, the power supply controller 4 is turned on to start supplying power to each part of the apparatus, and drive of the main CPU 5 is started (steps S12 and S13). The main control unit 2 (main CPU 5, RAM 7) can immediately operate even if power supply is started (a state in which received data can be received)
Therefore, the loop is repeated until the main control unit 2 becomes operable, and when the OK signal is received from the main control unit 2, the sub CPU 11 stops and the power saving mode ends (steps S14 and S15).
【００１６】図４は省電力モード解除時のメインＣＰＵ
５における処理である。サブＣＰＵ１１により電源コン
トローラがＯＮされメインＣＰＵ５が駆動を始めると、
まずメインＣＰＵ５自身及びＲＡＭ７のセルフチェック
を行う（ステップＳ２０）。チェックが終了し動作可能
状態になれば、サブＣＰＵ１１に対しＯＫの信号を送信
する（ステップＳ２２）。次に、メモリ１２に蓄積され
ている受信データを読み出し、メイン制御部２内にある
ＲＡＭ７に転送を行う（ステップＳ２３）。転送が終了
するとサブＣＰＵ１１からデータ受信処理を引き継ぎ
（ステップＳ２４）、以後はメインＣＰＵ５がデータ受
信処理を行い、サブＣＰＵ１１は停止する。この時点で
省電力モードは解除されたことになる。全てのデータ受
信を終了すると印字を行い（ステップＳ２５）、処理を
終了する。FIG. 4 shows the main CPU when the power saving mode is released.
This is the process in 5. When the power controller is turned on by the sub CPU 11 and the main CPU 5 starts driving,
First, the main CPU 5 itself and the RAM 7 are self-checked (step S20). When the check is completed and the operation is ready, an OK signal is transmitted to the sub CPU 11 (step S22). Next, the received data stored in the memory 12 is read out and transferred to the RAM 7 in the main controller 2 (step S23). When the transfer is completed, the data reception process is taken over from the sub CPU 11 (step S24), and thereafter, the main CPU 5 performs the data reception process and the sub CPU 11 stops. At this point, the power saving mode has been canceled. When reception of all data is completed, printing is performed (step S25), and the process is completed.
【００１７】[0017]
【発明の効果】以上説明してきたように、本発明による
画像形成装置によれば、メイン制御部の他にサブ制御部
を設け、通常動作中はメイン制御部のみを動作させ、省
電力モード中はサブ制御部のみを動作させるようにした
ので、省電力モード中に消費電力の大きなＣＰＵやメモ
リの電源供給を遮断することができ、消費電力を大幅に
削減できる。また、省電力モード中はサブＣＰＵが外部
機器とのデータ授受を受け持つので、メイン制御部の電
源を遮断する省電力モード中であっても、外部機器から
の指示やデータを受け付けることができる。更に、サブ
ＣＰＵ側に小容量のメモリを設けることにより、小電力
モードでメイン制御部が動作可能になっていない状態で
もデータ受信を開始することができ、受信したデータは
このメモリに蓄積されるのでデータの取りこぼしを防ぐ
ことができる。As described above, according to the image forming apparatus of the present invention, the sub-control unit is provided in addition to the main control unit, and only the main control unit is operated during the normal operation and the power saving mode is set. Since only the sub-control unit is operated, it is possible to cut off the power supply to the CPU and the memory that consume a large amount of power during the power saving mode, and it is possible to significantly reduce the power consumption. Further, since the sub CPU takes charge of data exchange with the external device during the power saving mode, it is possible to receive instructions and data from the external device even during the power saving mode in which the power of the main control unit is cut off. Furthermore, by providing a small-capacity memory on the sub CPU side, data reception can be started even in a state where the main control unit is not operable in the low power mode, and the received data is stored in this memory. Therefore, data loss can be prevented.
【図１】本発明による画像形成装置であるプリンタのブ
ロック構成図である。FIG. 1 is a block configuration diagram of a printer which is an image forming apparatus according to the present invention.
【図２】省電力モードに入る際のメインＣＰＵ５の処理
を示すフローチャートである。FIG. 2 is a flowchart showing a process of a main CPU 5 when entering a power saving mode.
【図３】省電力モード中にデータを受信した際のサブＣ
ＰＵ１１の処理を示すフローチャートである。FIG. 3 is a sub-C when data is received in the power saving mode.
It is a flow chart which shows processing of PU11.
【図４】省電力モードが解除される際のメインＣＰＵ５
の処理を示すフローチャートである。FIG. 4 is a main CPU 5 when the power saving mode is released.
It is a flowchart which shows the process of.
１：プリンタ本体 ２：メイン制御部 ３：
インターフェイス部 ４：電源コントローラ ５：メインＣＰＵ ６：
ＲＯＭ ７：ＲＡＭ １１：サブＣＰＵ １
２：メモリ １３：ホストコンピュータ1: Printer body 2: Main control unit 3:
Interface part 4: Power supply controller 5: Main CPU 6:
ROM 7: RAM 11: Sub CPU 1
2: Memory 13: Host computer
Claims (2)
への電力供給を低減もしくは遮断して電力消費の低減を
図る省電力モードを有する画像形成装置において、装置
各部を制御するメイン制御部と、外部機器とのインター
フェイスを制御するサブ制御部とを設け、省電力モード
中は前記メイン制御部を停止しサブ制御部のみ動作する
ことを特徴とする画像形成装置。1. An image forming apparatus having a power saving mode for reducing power consumption by reducing or cutting off power supply to each section of the apparatus during standby when no processing is being performed, and a main control section for controlling each section of the apparatus. An image forming apparatus, comprising: a sub-control unit for controlling an interface with an external device, wherein the main control unit is stopped and only the sub-control unit operates during a power saving mode.
ンバイモード中に外部機器からのデータを受けると、記
憶手段にデータ記憶を開始すると共に前記メイン制御部
を復帰させることを特徴とする請求項１記載の画像形成
装置。2. The sub-control unit has a storage unit, and when receiving data from an external device in the standby mode, starts storing data in the storage unit and restores the main control unit. The image forming apparatus according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6237941A JPH08101609A (en) | 1994-09-30 | 1994-09-30 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6237941A JPH08101609A (en) | 1994-09-30 | 1994-09-30 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08101609A true JPH08101609A (en) | 1996-04-16 |
Family
ID=17022736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6237941A Pending JPH08101609A (en) | 1994-09-30 | 1994-09-30 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08101609A (en) |
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