JP3443180B2 - Image reading device - Google Patents
Image reading deviceInfo
- Publication number
- JP3443180B2 JP3443180B2 JP22059894A JP22059894A JP3443180B2 JP 3443180 B2 JP3443180 B2 JP 3443180B2 JP 22059894 A JP22059894 A JP 22059894A JP 22059894 A JP22059894 A JP 22059894A JP 3443180 B2 JP3443180 B2 JP 3443180B2
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- Prior art keywords
- fluorescent tube
- time
- light
- turned
- light amount
- Prior art date
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Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は複写装置などの画像読取
装置に関し，より詳細には，光源として複数の蛍光管を
有する画像読取装置に関する。
【０００２】
【従来の技術】従来の画像読取装置として，例えば，反
射原稿に使用する蛍光管と，透過原稿に使用する蛍光管
とを備えた複写装置がある。このような装置において，
蛍光管を使用する場合，蛍光管の特性により，蛍光管が
冷えているときは，発光する光量が不足するので，使用
時に蛍光管を温めて保温する必要がある。
【０００３】図５は，従来の画像読取装置における保温
シーケンスを示し，換言すれば，反射原稿に使用する第
１の蛍光管および透過原稿に使用する第２の蛍光管の点
灯と消灯のタイミングを示したものである。第１の蛍光
管の点灯する時間は，第１の蛍光管の光量を所定のセン
サで検知して，第１の蛍光管の温度が上昇するように点
灯時間を制御する。また，第２の蛍光管を点灯する時間
は，第１の蛍光管を消灯した状態で，第１の蛍光管を点
灯した時間と同じ時間とする。
【０００４】電源投入直後は，第１の蛍光管と第２の蛍
光管は温度を上げるために時間を要するので，あらかじ
めウォームアップタイムを装置に設けて第１，第２の蛍
光管を温め，第１，第２の蛍光管が温まった状態でウォ
ームアップを完了し，ユーザが使用する際，すぐに使用
可能としている。
【０００５】また，第１の蛍光管と第２の蛍光管の点灯
時間は同じ時間に設定しており，図示の如く，第１の蛍
光管か点灯中は第２の蛍光管を消灯し，また，第２の蛍
光管の点灯中は第１の蛍光管を消灯するように，第１，
第２の蛍光管に電圧を印加する電源を１つとすること
で，構成を簡素化して，価格の低減を図っている。
【０００６】
【発明が解決しようとする課題】しかしながら，従来の
画像読取装置の保温シーケンスによれば，電源投入直
後，第１の蛍光管を点灯して消灯したとき，第２の蛍光
管を第１の蛍光管が点灯した時間と同じ時間点灯するよ
うにしているため，第２の蛍光管を点灯している間に第
１の蛍光管は消灯しており，消灯中の蛍光管が冷えるこ
とになり，消灯中の蛍光管の光量が減少してしまうとい
う問題点があった。換言すれば，光量の時間的ムラがか
なり大きくなるという問題点があった。
【０００７】また，光量の時間的ムラがかなり大きくな
るということは，ウォームアップタイムが長時間になっ
てしまい，ユーザにとっては扱いにくい装置となってし
まうという問題点があった。
【０００８】また，何れかの蛍光管を必ず点灯させてい
るので，両方の蛍光管が温まっているときや，高室温内
での使用時には，無駄な保温をしていることになり，換
言すれば，電圧を印加する電源電力の無駄な消費や，蛍
光管の寿命が短くなるという問題点があった。
【０００９】本発明は上記に鑑みてなされたものであっ
て，それぞれの蛍光管の内，少なくともどちらかの蛍光
管が温まっている時，保温シーケンスを変更し，光量の
時間的ムラを少なくすることを目的とする。
【００１０】また，本発明は上記に鑑みてなされたもの
であって，電源投入直後のウォームアップタイムの時間
を短縮することを目的とする。
【００１１】
【課題を解決するための手段】上述の目的を達成するた
めに，請求項１に係る画像読取装置は，２つの蛍光管
と，前記２つの蛍光管の光量を検知する光量センサー
と，前記光量センサーが検出する前記蛍光管の点灯によ
る光量上昇率と，検出された前記光量上昇率と所定の光
量上昇基準値とを比較して，前記２つの蛍光管が消灯状
態から所定光量に達するまでの第１の時間で交互に点灯
と消灯とを繰り返す第１の保温シーケンス，および，前
記第１の時間点灯された前記蛍光管が前記所定の光量に
到達後から消灯して所定の低下光量だけ低下するまでの
第２の時間と前記第１の時間とのうち長い時間を消灯時
間として選択し，前記２つの蛍光管が前記第１の時間の
点灯と前記消灯時間の消灯とを，片方ずつ交互に繰り返
す第２の保温シーケンスの中から１を選択して，選択さ
れた保温シーケンスに基づいて前記２つの蛍光管の点灯
および消灯の制御を行う制御手段と，を備えたものであ
る。
【００１２】
【００１３】
【００１４】
【作用】本発明の画像読取装置（請求項１）は前記蛍光
管の光量を検知する光量センサーを備え，前記制御手段
は，前記光量センサーが検出する前記蛍光管の点灯によ
る光量上昇率と，検出された前記光量上昇率と所定の光
量上昇基準値とを比較して，前記２つの蛍光管が消灯状
態から所定光量に達するまでの第１の時間で交互に点灯
と消灯とを繰り返す第１の保温シーケンス，および，前
記第１の時間点灯された前記蛍光管が前記所定の光量に
到達後から消灯して所定の低下光量だけ低下するまでの
第２の時間と前記第１の時間とのうち長い時間を消灯時
間として選択し，前記２つの蛍光管が前記第１の時間の
点灯と前記消灯時間の消灯とを，片方ずつ交互に繰り返
す第２の保温シーケンスの中から１を選択して，選択さ
れた保温シーケンスに基づいて前記２つの蛍光管の点灯
および消灯の制御を行うので，蛍光管が温まっていると
き，保温シーケンスを変更する。
【００１５】
【００１６】
【００１７】
【実施例】以下，本発明の画像読取装置について，〔実
施例１〕，〔実施例２〕の順で図面を参照して詳細に説
明する。
【００１８】〔実施例１〕図１は，実施例１の画像読取
装置の概略ブロック図を示し，反射原稿に使用する蛍光
管１０１と，透過原稿に使用する蛍光管１０２と，蛍光
管１０１の光量を検知する光量センサ１０３と，光量セ
ンサ１０３で検知した光量に基づいて，蛍光管１０１，
１０２の点灯制御を行う制御部１０４とから構成され
る。なお，制御部１０４は，蛍光管１０１，１０２を昇
温するための保温シーケンスおよび蛍光管１０１，１０
２を保温するための保温シーケンスの少なくとも２種類
の保温シーケンスを有している。
【００１９】図２は，蛍光管１０１および蛍光管１０２
の点灯と消灯のタイミングと，光量センサ１０３で検知
した蛍光管１０１の光量を示す。ここで，図２を参照し
て，制御部１０３の保温シーケンスについて説明する。
【００２０】蛍光管１０１が点灯してから消灯するまで
の時間をΔｔ1 とし，蛍光管１０１がΔｔ1 時間に光量
が上昇した光量をΔＶとし，また，蛍光管１０１が消灯
してから次の点灯開始するまでの時間をΔｔ2 とする。
光量は，光量センサを使用して計る。Δｔ2 の時間は，
蛍光管１０１が消灯している時に，光量ΔＶがあらかじ
め設定した光量までに下がるタイミングに基づいて決定
される。なお，実施例１では光量を計るのに，光量セン
サを使用してしるが，蛍光管の温度を測定して，測定し
た温度から蛍光管の光量を計ることで代用しても良いこ
とは勿論である。
【００２１】蛍光管１０１がΔｔ1 で点灯した後，蛍光
管１０２の点灯時間は，蛍光管１０１が点灯した時間で
あるΔｔ1 であり，また，そのとき蛍光管１０１は，Δ
ｔ2の時間消灯している。ここで，蛍光管１０１の消灯
時間は，
Δｔ1 ≧Δｔ2 の場合，Δｔ1 時間
Δｔ1 ＜Δｔ2 の場合，Δｔ2 時間
となる。
【００２２】ここで，図３を参照に，実施例１の保温シ
ーケンスを説明する。図３は，保温シーケンスを示す。
蛍光管１０１は点灯し（Ｓ３０１），光量センサにて蛍
光管１０１の光量を測定し，測定した光量があらかじめ
設定した光量に達した（ＯＫ）か否かを判断し（Ｓ３０
２），光量がＯＫでない場合には，繰り返し蛍光管１０
１の光量測定を行ない，光量がＯＫの場合には，蛍光管
１０１の消灯を行なう（Ｓ３０３）。
【００２３】蛍光管１０１の消灯により，Δｔ1 および
ΔＶを求められ，求めたたΔｔ1 およびΔＶに基づいて
Δｔ2 を決定する（Ｓ３０４）。蛍光管１０２の点灯を
開始し（Ｓ３０５），Δｔ1 時間経過後（Ｓ３０６），
蛍光管１０２を消灯する（Ｓ３０７）。ここで，Δｔ1
とステップＳ３０４にて決定したΔｔ2 を比較し（Ｓ３
０８），Δｔ1 ≧Δｔ2 の場合には，ステップＳ３０１
に行き蛍光管１０１の点灯を行い，Δｔ1 ＜Δｔ2 の場
合には，蛍光管１０１の消灯時間がΔｔ2 時間を経過し
てから（Ｓ３０９），ステップＳ３０１に行き蛍光管１
０１の点灯を行う。
【００２４】前述したように実施例１によれば，Δｔ2
時間がΔｔ1 時間より長くなる時，蛍光管１０１の点灯
は，蛍光管１０２が消灯になっても行なわず，すなわ
ち，Δｔ2 −Δｔ1 の時間差が，蛍光管１０１と蛍光管
１０２が共に消灯している時間となり，ムダな保温をな
くして，消費電力の低減ができることになる。
【００２５】また，Δｔ2 時間は，蛍光管１０１の光量
が安定している程長くなり，すなわち，Δｔ2 −Δｔ1
の時間差が長くなるので，安定すればする程，さらに消
費電力の低減ができる。
【００２６】〔実施例２〕実施例２の基本的な構成は，
実施例１と同様のため，ここでは実施例１と異なる部分
のみを説明する。また，実施例２では，画像読取装置の
電源投入直後の保温シーケンスを説明する。
【００２７】図４は，電源投入から昇温するための保温
シーケンスと，保温するための保温シーケンスの切り換
えを示す。また，図４において，昇温するための保温シ
ーケンスは蛍光管１０１と蛍光管１０２との点灯時間の
配分比を１：１としたものである。
【００２８】電源投入直後の保温シーケンスは，蛍光管
１０１，１０２を交互にあらかじめ設定した間隔（実施
例２では３０秒間隔）で点灯および消灯させるものであ
る。ここで，光量センサは，蛍光管１０１，１０２の点
灯および消灯を繰り返している時に，蛍光管１０１が点
灯する時から消灯する時の光量の上昇率の値（以下，計
測値と記載する）を計る。次に，計測値とあらかじめ設
定されている上昇率の値（以下，基準値と記載する）と
を比較し，計測値が小さい場合，他の保温シーケンスに
切り換える。なお，基準値は，蛍光管が発する光量が一
定になるように設定するのが良く，そのため，あらかじ
め蛍光管の評価を行って基準値を決めることが望まし
い。
【００２９】また，図示の如く，蛍光管１０１および蛍
光管１０２が温まった後は，蛍光管１０１，１０２の両
方共消灯している時間であるΔｔ4 は，時間Δｔ3 に比
べて長い。
【００３０】また，実施例２では光量センサを使用した
が，光量センサを用いないで，あらかじめ蛍光管が発す
る光量が一定になる時間を調べ，該時間に基づいて，電
源投入直後から時間がきたら他の保温シーケンスに切り
換えるようにしても良い。
【００３１】電源投入の直前は蛍光管１０１，１０２の
温度は低く，発する光量も不安定であるため，実施例２
によれば，温度上昇および光量の安定化を図れるように
点灯時間をあらかじめ設定しておき，また，蛍光管の発
する光量が安定した時点で，他の保温シーケンスに切り
換えるようにしている。したがって，光量の時間的ムラ
がなくなると共に，ウォームアップタイムが短縮され，
消費電力が低減でき，また，蛍光管の寿命を延ばすこと
ができる。
【００３２】
【発明の効果】以上説明したように，本発明の画像読取
装置（請求項１）によれば，蛍光管の光量を検知する少
なくとも１つ以上の光量センサを有し，光量センサの検
知する光量の上昇率に基づき，２つの保温シーケンスか
ら１つを選択して蛍光管の点灯と消灯を制御することに
よって，蛍光管の温度が温まっているときも，最適な保
温シーケンスとすることができるため，最適な保温シー
ケンスに変更し，光量の時間的ムラを少なくすることが
できる。
【００３３】
【００３４】Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus such as a copying apparatus, and more particularly, to an image reading apparatus having a plurality of fluorescent tubes as a light source. 2. Description of the Related Art As a conventional image reading apparatus, for example, there is a copying apparatus provided with a fluorescent tube used for a reflective original and a fluorescent tube used for a transparent original. In such a device,
When a fluorescent tube is used, when the fluorescent tube is cold, the amount of emitted light is insufficient when the fluorescent tube is cold. Therefore, it is necessary to warm the fluorescent tube and keep it warm during use. FIG. 5 shows a warming sequence in a conventional image reading apparatus. In other words, the turning on and off timings of a first fluorescent tube used for a reflective original and a second fluorescent tube used for a transparent original are described. It is shown. The lighting time of the first fluorescent tube is controlled by detecting the amount of light of the first fluorescent tube with a predetermined sensor and increasing the temperature of the first fluorescent tube. The time for turning on the second fluorescent tube is the same as the time for turning on the first fluorescent tube with the first fluorescent tube turned off. Immediately after the power is turned on, the first fluorescent tube and the second fluorescent tube require time to raise the temperature. Therefore, a warm-up time is provided in advance in the apparatus to warm the first and second fluorescent tubes. The warm-up is completed in a state where the first and second fluorescent tubes are warmed, and the user can use the tube immediately when using it. [0005] The lighting time of the first fluorescent tube and the second fluorescent tube is set to the same time. As shown in the figure, while the first fluorescent tube is being lit, the second fluorescent tube is turned off. The first and second fluorescent lamps are turned off while the second fluorescent tube is turned on.
By using only one power supply for applying a voltage to the second fluorescent tube, the configuration is simplified and the cost is reduced. However, according to the heat retention sequence of the conventional image reading apparatus, when the first fluorescent tube is turned on and off immediately after the power is turned on, the second fluorescent tube is turned off. The first fluorescent tube is turned off while the second fluorescent tube is turned on because the first fluorescent tube is turned on for the same time as the time when the first fluorescent tube is turned on. As a result, there is a problem that the light quantity of the fluorescent tube when the light is turned off decreases. In other words, there is a problem that the temporal unevenness of the light amount becomes considerably large. [0007] Further, if the temporal unevenness of the light quantity becomes considerably large, there is a problem that the warm-up time becomes long and the device becomes difficult to handle for the user. Also, since one of the fluorescent tubes is always turned on, when both the fluorescent tubes are warm or when used in a high room temperature, the temperature is wasted and the temperature is wasted. For example, there is a problem that power supply power for applying a voltage is wasted and the life of the fluorescent tube is shortened. The present invention has been made in view of the above, and when at least one of the fluorescent tubes is warm, the heat retention sequence is changed to reduce temporal unevenness in the amount of light. The purpose is to: The present invention has been made in view of the above, and has as its object to reduce the warm-up time immediately after power-on. According to another aspect of the present invention, there is provided an image reading apparatus comprising: two fluorescent tubes; a light amount sensor for detecting light amounts of the two fluorescent tubes; , The lighting of the fluorescent tube detected by the light quantity sensor
The rate of increase in the amount of light,
The two fluorescent tubes are turned off by comparing the
Lights alternately in the first time from the state to the predetermined light amount
1st heat retention sequence which repeats and turns off and before
The fluorescent tube illuminated for the first time is set to the predetermined light amount.
After the light arrives, it goes off until it drops by a predetermined amount.
When turning off a long time out of the second time and the first time
Between the two fluorescent tubes during the first time period.
Illumination and extinguishing during the extinguishing time are alternately repeated one by one
Select 1 from the second heat retention sequence and select
Control means for controlling the turning on and off of the two fluorescent tubes based on the determined heat retention sequence . [0012] [0013] [0014] [action] The image reading apparatus of the present invention (Claim 1) is provided with a light amount sensor for detecting the light quantity of the fluorescent tube, the control means, the fluorescence which said light quantity sensor detects By lighting the tube
The rate of increase in the amount of light,
The two fluorescent tubes are turned off by comparing the
Lights alternately in the first time from the state to the predetermined light amount
1st heat retention sequence which repeats and turns off and before
The fluorescent tube illuminated for the first time is set to the predetermined light amount.
After the light arrives, it goes off until it drops by a predetermined amount.
When turning off a long time out of the second time and the first time
Between the two fluorescent tubes during the first time period.
Illumination and extinguishing during the extinguishing time are alternately repeated one by one
Select 1 from the second heat retention sequence and select
Lighting of the two fluorescent tubes based on the selected heat retention sequence
Since the control for turning off the lamp and the control for turning off the lamp are performed , the heat retention sequence is changed when the fluorescent tube is heated. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image reading apparatus according to the present invention will be described in detail in the order of Embodiment 1 and Embodiment 2 with reference to the drawings. FIG. 1 is a schematic block diagram of an image reading apparatus according to a first embodiment. A fluorescent tube 101 used for a reflective original, a fluorescent tube 102 used for a transparent original, and a fluorescent tube 101 are shown. A light amount sensor 103 for detecting the light amount, and a fluorescent tube 101 based on the light amount detected by the light amount sensor 103.
And a control unit 104 for controlling the lighting of 102. Note that the control unit 104 performs a heat retention sequence for raising the temperature of the fluorescent tubes 101 and 102 and the fluorescent tubes 101 and 10.
2 has at least two types of heat retention sequences of the heat retention sequence. FIG. 2 shows a fluorescent tube 101 and a fluorescent tube 102.
And the timing of turning on and off the light, and the light amount of the fluorescent tube 101 detected by the light amount sensor 103. Here, with reference to FIG. 2, a warming sequence of the control unit 103 will be described. The time to the fluorescent tube 101 is turned off after the lighting as Delta] t 1, the amount of light fluorescent tube 101 is the light amount is increased to Delta] t 1 hour and [Delta] V, also follows from the fluorescent tube 101 is turned off The time until the start of lighting is defined as Δt 2 .
The light intensity is measured using a light intensity sensor. The time of Δt 2 is
When the fluorescent tube 101 is turned off, the light amount ΔV is determined based on the timing at which the light amount ΔV falls to a predetermined light amount. Although the light amount sensor is used to measure the light amount in the first embodiment, it may be substituted by measuring the temperature of the fluorescent tube and measuring the light amount of the fluorescent tube from the measured temperature. Of course. [0021] After the fluorescent tube 101 is lit by Delta] t 1, the lighting time of the fluorescent tube 102 is Delta] t 1 is the time the fluorescent tube 101 is lit, and then the fluorescent tube 101, delta
of have time off t 2. Here, the extinguishing time of the fluorescent tube 101, when the Δt 1 ≧ Δt 2, the case of Delta] t 1 hour Δt 1 <Δt 2, a Delta] t 2 hours. Here, the heat retention sequence of the first embodiment will be described with reference to FIG. FIG. 3 shows a heat retention sequence.
The fluorescent tube 101 is turned on (S301), the light amount of the fluorescent tube 101 is measured by the light amount sensor, and it is determined whether or not the measured light amount has reached a preset light amount (OK) (S30).
2) If the light quantity is not OK, repeat the fluorescent tube 10
The light amount measurement of step 1 is performed, and when the light amount is OK, the fluorescent tube 101 is turned off (S303). When the fluorescent tube 101 is turned off, Δt 1 and ΔV are obtained, and Δt 2 is determined based on the obtained Δt 1 and ΔV (S304). Lighting of the fluorescent tube 102 is started (S305), and after elapse of Δt 1 hour (S306),
The fluorescent tube 102 is turned off (S307). Here, Δt 1
And Δt 2 determined in step S304 (S3
08), if Δt 1 ≧ Δt 2 , step S301
To turn on the fluorescent tube 101, and when Δt 1 <Δt 2 , after turning off the fluorescent tube 101 for Δt 2 hours (S309), the process proceeds to step S301 and proceeds to step S301.
01 is turned on. As described above, according to the first embodiment, Δt 2
When the time is longer than the time Δt 1 , the fluorescent tube 101 is not turned on even when the fluorescent tube 102 is turned off, that is, the time difference Δt 2 −Δt 1 causes the fluorescent tube 101 and the fluorescent tube 102 to be turned off. This means that unnecessary heat retention is eliminated and power consumption can be reduced. The time Δt 2 becomes longer as the light amount of the fluorescent tube 101 becomes more stable, ie, Δt 2 −Δt 1
Since the time difference becomes longer, the more the power becomes stable, the more the power consumption can be reduced. Embodiment 2 The basic configuration of Embodiment 2 is as follows.
Since the second embodiment is the same as the first embodiment, only portions different from the first embodiment will be described here. In a second embodiment, a warming sequence immediately after the power of the image reading apparatus is turned on will be described. FIG. 4 shows a switching between a warming sequence for increasing the temperature after the power is turned on and a warming sequence for maintaining the temperature. In FIG. 4, the heat retention sequence for increasing the temperature is such that the lighting time distribution ratio of the fluorescent tubes 101 and 102 is 1: 1. In the heat retention sequence immediately after the power is turned on, the fluorescent tubes 101 and 102 are alternately turned on and off at a preset interval (30 second interval in the second embodiment). Here, the light amount sensor calculates a value of a rate of increase in light amount (hereinafter, referred to as a measured value) when the fluorescent tubes 101 are turned on and off when the fluorescent tubes 101 and 102 are repeatedly turned on and off. measure. Next, the measured value is compared with a value of a preset rise rate (hereinafter, referred to as a reference value), and when the measured value is small, switching to another heat retention sequence is performed. It is preferable that the reference value is set so that the amount of light emitted from the fluorescent tube is constant. Therefore, it is preferable to determine the reference value by evaluating the fluorescent tube in advance. As shown in the figure, after the fluorescent tube 101 and the fluorescent tube 102 are warmed, Δt 4 , which is the time during which both the fluorescent tubes 101 and 102 are turned off, is longer than the time Δt 3 . Although the light amount sensor is used in the second embodiment, the time when the light amount emitted from the fluorescent tube is constant is checked in advance without using the light amount sensor. You may switch to another heat retention sequence. The temperature of the fluorescent tubes 101 and 102 is low immediately before the power is turned on, and the emitted light amount is unstable.
According to the method, the lighting time is set in advance so as to stabilize the temperature rise and the light quantity, and when the light quantity emitted from the fluorescent tube is stabilized, switching to another heat retention sequence is performed. Therefore, the temporal unevenness of the light amount is eliminated, and the warm-up time is shortened.
The power consumption can be reduced, and the life of the fluorescent tube can be extended. [0032] As described above, according to the present invention, the image reading apparatus according to (Claim 1), one or more light amount sensors also small <br/> without detecting the light intensity of the fluorescent tube of the present invention With two heat retention sequences based on the rate of increase in light intensity detected by the light intensity sensor .
By selecting one of these and controlling the turning on and off of the fluorescent tube, the optimal heat retention sequence can be achieved even when the temperature of the fluorescent tube is warm. Can be reduced in time. [0034]
【図面の簡単な説明】
【図１】実施例１の画像読取装置の概略ブロック図であ
る。
【図２】実施例１の保温シーケンスを示す説明図であ
る。
【図３】実施例１の保温シーケンスを示すフローチャー
ト図である。
【図４】実施例２の電源投入直後の保温シーケンスを示
す説明図である。
【図５】従来の保温シーケンスを示す説明図である。
【符号の説明】
１０１，１０２ 蛍光管
１０３ 光量センサ
１０４ 制御部BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram of an image reading apparatus according to a first embodiment. FIG. 2 is an explanatory diagram illustrating a heat retention sequence according to the first embodiment. FIG. 3 is a flowchart illustrating a heat retention sequence according to the first embodiment. FIG. 4 is an explanatory diagram showing a heat retention sequence immediately after power-on according to a second embodiment. FIG. 5 is an explanatory diagram showing a conventional heat retention sequence. [Description of Signs] 101, 102 Fluorescent tube 103 Light intensity sensor 104 Control unit
Claims (1)
量上昇率と，検出された前記光量上昇率と所定の光量上
昇基準値とを比較して， 前記２つの蛍光管が消灯状態から所定光量に達するまで
の第１の時間で交互に点灯と消灯とを繰り返す第１の保
温シーケンス，および，前記第１の時間点灯された前記
蛍光管が前記所定の光量に到達後から消灯して所定の低
下光量だけ低下するまでの第２の時間と前記第１の時間
とのうち長い時間を消灯時間として選択し，前記２つの
蛍光管が前記第１の時間の点灯と前記消灯時間の消灯と
を，片方ずつ交互に繰り返す第２ の保温シーケンスの中
から１を選択して，選択された保温シーケンスに基づい
て前記２つの蛍光管の点灯および消灯の制御を行う制御
手段と， を備えた ことを特徴とする画像読取装置。(57) Claims 1. Two fluorescent tubes, a light amount sensor for detecting a light amount of the two fluorescent tubes, and a light by lighting of the fluorescent tube detected by the light amount sensor.
The rate of increase in the amount, the detected rate of increase in the amount of light and the predetermined amount of light.
The two fluorescent tubes are turned off to reach a predetermined amount of light by comparing with the rising reference value.
In the first maintenance mode, which alternately turns on and off at the first time
A temperature sequence, and said first time lit
After the fluorescent tube reaches the predetermined light amount, it is turned off and a predetermined low
The second time and the first time until the lower light amount is reduced
And the longer time is selected as the turn-off time.
The fluorescent tube is turned on for the first time and turned off for the turn-off time.
Is selected from among the second heat retention sequences that are alternately repeated one by one , based on the selected heat retention sequence.
Control for controlling the turning on and off of the two fluorescent tubes Te
Image reading apparatus characterized by comprising: a means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22059894A JP3443180B2 (en) | 1994-09-14 | 1994-09-14 | Image reading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22059894A JP3443180B2 (en) | 1994-09-14 | 1994-09-14 | Image reading device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0887075A JPH0887075A (en) | 1996-04-02 |
| JP3443180B2 true JP3443180B2 (en) | 2003-09-02 |
Family
ID=16753495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22059894A Expired - Fee Related JP3443180B2 (en) | 1994-09-14 | 1994-09-14 | Image reading device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3443180B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101334206B1 (en) | 2007-06-27 | 2013-11-29 | 삼성전자주식회사 | Image scanning apparatus and method thereof |
-
1994
- 1994-09-14 JP JP22059894A patent/JP3443180B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0887075A (en) | 1996-04-02 |
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