JPH0514260B2 - - Google Patents
Info
- Publication number
- JPH0514260B2 JPH0514260B2 JP58132104A JP13210483A JPH0514260B2 JP H0514260 B2 JPH0514260 B2 JP H0514260B2 JP 58132104 A JP58132104 A JP 58132104A JP 13210483 A JP13210483 A JP 13210483A JP H0514260 B2 JPH0514260 B2 JP H0514260B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- document
- light emitting
- emitting element
- cover
- 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.)
- Expired - Lifetime
Links
- 230000003287 optical effect Effects 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
Classifications
-
- 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
- G03G15/60—Apparatus which relate to the handling of originals
- G03G15/607—Apparatus which relate to the handling of originals for detecting size, presence or position of original
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Holders For Sensitive Materials And Originals (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
Description
〈技術分野〉
本発明は複写機等における原稿サイズを光学的
に検出する原稿サイズ検出装置に関するものであ
る。
〈発明の背景〉
先に出願者は、昭和58年１月21日付け実用新案
登録願昭和58年第7765号、考案の名称「原稿サイ
ズ検出装置」において、第１図および第２図に示
されるような原稿サイズ検出装置を提案した。
第１図は複写機における原稿を載置する原稿台
部分を示す図で、原稿を載置する透明板１は少な
くとも複写可能な最大原稿サイズに設計されてい
る。該透明板１付近には原稿複写に支障をきたさ
ない原稿台の周縁枠等を利用してＡ，Ｂサイズの
原稿載置場所が表示され、複写動作にあたつては
表示に従つて原稿が透明板１上にセツトされる。
上記透明板１を被う原稿カバー２は原稿台の一
側３で回動自在に取り付けられ、原稿載置のため
の透明板１上を開閉する。上記原稿カバー２の透
明板１と対向する表面側は少なくとも後述する発
光素子の光が照射される領域が反射効率の高い鏡
面体のような反射面４で形成されている。本実施
例では発光素子が複数個一列に配置されるため反
射面４は帯状に形成される。
上記原稿台部分に対して上記透明板１より機内
側に、複写時の原稿照明用露光ランプとは別に発
光素子５が設けられ、透明板１上に原稿が在る状
態では原稿を、原稿がセツトされていない状態で
は原稿カバーを照射する。上記発光素子５の配置
に対応させて、原稿カバー３の反射面４で反射さ
れた発光が届く位置で且つ透明板１上に載置され
た原稿からの反射光が入射しない位置に受光素子
６が設置されている。
上記発光素子５と受光素子６とからなる原稿有
無を検知するセンサの設置位置はＡ，Ｂサイズの
各原稿に対応して選ばれ、例えば４個の発光素子
５1〜５4が第１図中に×印で示す位置に設けられ
る。即ちB5，B4，A4及びA3サイズの原稿の判
別が可能になるように発光素子５1はB5枠内、発
光素子５2はB5枠内でA4枠内、発光素子５3はA4
枠外でB4枠内、発光素子５4はB4枠外でA3枠内
に夫々設けられる。受光素子６1〜６4は第１図中
○印で示され、上記発光素子５1〜５4に対応させ
て設置される。
なお、A3枠外の発光素子55と受光素子65は、
原稿カバー２開閉のモニター用のために設けられ
たものである。
ここで原稿カバー２の反射面４を介しての発光
素子５と受光素子６との光結合は、第２図に示す
如く、原稿カバー２が透明板１に対して角度θ
（θ≠０）をもつ状態、即ち透明板１上に原稿を
セツトした後原稿カバー２で被う途中の過程で、
反射面４からの反射光を受光することによつて原
稿サイズを検知する。
発光・受光素子の位置は、光路図を参考にして
決められるが、具体的な設置の一例を挙げると、
発光素子５は原稿台の一側３から約200mm、透明
板１上面から約20mmの位置に水平から約20°の角
度傾斜させて設置する。このとき原稿カバー２が
水平に対してθ＝20〜30°の範囲を移動する際、
発光素子５から放射され、反射面４で反射された
光は発光素子５から原稿台の符号３側へ約135mm、
透明板１から下方へ約15mmの位置に集光する。こ
の集光位置にセンサを構成する受光素子６が配置
される。従つて、原稿カバー２が所定角度θの範
囲で開放されている状態において、反射面４は発
光素子５からの光を原稿台である透明板１を透過
して受光素子６へと導くような光結合関係の光路
を確立するための光路設定手段を構成する。
発光素子５と受光素子６の光結合関係は上記具
体例に限られるものではなく、要は原稿カバー２
を閉成する途中で原稿台である透明板１より上位
置にある反射面４に反射された発光素子５からの
光が直接受光素子６に集光される位置関係に配置
されればよく、要するに透過光を検出する位置関
係に配置される。
上記各位置に設けられた受光素子６1〜６4の出
力状態の組合せを求めることによつて、原稿の有
無の検知及びサイズが検知される。次表は原稿サ
イズと受光素子６1〜６4の出力信号との関係を示
し、○印は受光素子が受光している状態、×印は
受光していない状態を示す。
<Technical Field> The present invention relates to a document size detection device for optically detecting the document size in a copying machine or the like. <Background of the Invention> Previously, the applicant filed a utility model registration application No. 7765 of 1982 dated January 21, 1985, with the title of the device "Manuscript size detection device," as shown in Figures 1 and 2. We proposed a document size detection device that can FIG. 1 is a diagram showing a document table portion of a copying machine on which a document is placed, and a transparent plate 1 on which the document is placed is designed to have at least the maximum size of the document that can be copied. Near the transparent plate 1, the placement locations for A and B size originals are displayed using the peripheral frame of the original table that does not interfere with original copying, and during the copying operation, the originals are placed according to the display. It is set on a transparent plate 1. A document cover 2 covering the transparent plate 1 is rotatably attached to one side 3 of the document table, and opens and closes the transparent plate 1 for placing the document. On the surface side of the document cover 2 facing the transparent plate 1, at least a region irradiated with light from a light emitting element, which will be described later, is formed of a reflective surface 4 like a specular body with high reflection efficiency. In this embodiment, since a plurality of light emitting elements are arranged in a line, the reflective surface 4 is formed in a band shape. A light-emitting element 5 is provided on the inside of the machine from the transparent plate 1 with respect to the document table, in addition to the exposure lamp for illuminating the document during copying. When not set, the document cover is irradiated. Corresponding to the arrangement of the light-emitting element 5, a light-receiving element 6 is located at a position where the light emitted reflected from the reflective surface 4 of the document cover 3 can reach and where reflected light from the document placed on the transparent plate 1 does not enter. is installed. The installation position of the sensor for detecting the presence or absence of an original, which is composed of the light emitting element 5 and the light receiving element 6, is selected corresponding to each of A and B size originals.For example, four light emitting elements 51 to 54 are installed as shown in FIG. It is provided at the position indicated by the x mark inside. That is, to make it possible to distinguish B5, B4, A4, and A3 size documents, light emitting element 5 1 is placed within the B5 frame, light emitting element 5 2 is placed within the B5 frame and within the A4 frame, and light emitting element 5 3 is placed within the A4 frame.
The light emitting element 54 is provided outside the B4 frame and within the A3 frame, respectively. The light receiving elements 6 1 to 6 4 are indicated by circles in FIG. 1 and are installed corresponding to the light emitting elements 5 1 to 5 4 . In addition, the light emitting element 5 5 and the light receiving element 6 5 outside the A3 frame are
This is provided for monitoring the opening and closing of the document cover 2. Here, the optical coupling between the light emitting element 5 and the light receiving element 6 via the reflective surface 4 of the document cover 2 is as shown in FIG.
(θ≠0), that is, in the process of covering the original with the original cover 2 after setting it on the transparent plate 1,
The document size is detected by receiving the reflected light from the reflective surface 4. The positions of the light-emitting and light-receiving elements are determined by referring to the optical path diagram, but an example of a specific installation is as follows:
The light emitting element 5 is installed at a position approximately 200 mm from one side 3 of the document table and approximately 20 mm from the upper surface of the transparent plate 1, and inclined at an angle of approximately 20° from the horizontal. At this time, when the document cover 2 moves in the range of θ = 20 to 30 degrees with respect to the horizontal,
The light emitted from the light emitting element 5 and reflected by the reflective surface 4 travels approximately 135 mm from the light emitting element 5 to the reference numeral 3 side of the document table.
The light is focused at a position approximately 15 mm downward from the transparent plate 1. A light receiving element 6 constituting a sensor is arranged at this light condensing position. Therefore, when the document cover 2 is opened within a predetermined angle θ, the reflective surface 4 is configured to guide the light from the light emitting element 5 to the light receiving element 6 through the transparent plate 1 serving as the document table. It constitutes an optical path setting means for establishing an optical path in an optical coupling relationship. The optical coupling relationship between the light emitting element 5 and the light receiving element 6 is not limited to the above specific example;
It is only necessary that the light emitting element 5 is arranged in a positional relationship such that the light from the light emitting element 5 reflected on the reflective surface 4 located above the transparent plate 1 serving as the document table during closing is directly focused on the light receiving element 6. In short, they are arranged in a positional relationship that allows them to detect transmitted light. By determining the combination of the output states of the light receiving elements 6 1 to 6 4 provided at each of the above positions, the presence or absence of a document and its size are detected. The following table shows the relationship between the document size and the output signals of the light receiving elements 6 1 to 6 4 , where the circle mark indicates a state in which the light receiving element is receiving light, and the mark x indicates a state in which the light receiving element is not receiving light.
【表】
上記構成によれば、原稿カバー２を閉成する過
程は、即ち原稿カバー２の所定傾斜状態において
原稿のサイズを検知するため、厚みのある原稿に
対しても何等支障なく検知することができ、原稿
検知の機能を広い範囲に亘つて活用することがで
きる。また反射効率の高い反射面４からの反射光
の有無の組合せにより原稿サイズを検知している
ため、光吸収のために反射効率の悪い原稿に対し
ても確実に検知することができ、高い精度の検知
動作を行わせることができる。
ところで、上記のような装置において、複数個
の発光素子５1〜５5を同時に発光すると、受光素
子６1〜６5に入射する光は１対１に対向する発光
素子の光のみならず他の発光素子からのクロスト
ーク光がある。原稿がない場合の入力光信号を
Ｓ、原稿がある場合の入力光信号をＮとすると、
上記クロストーク光のため、原稿がある場合と原
稿がない場合との信号比Ｓ／Ｎが悪くなり、これ
らの判別ができなくなるという問題点があつた。
第３図はクロストーク光を測定するための実験
装置の概要を示すものであり、中央に発光素子５
３を１個取付け、第１図の装置に模して、発光素
子５3からａ＝20mmの距離にスリツトを有する適
当な遮光板Ａを配置するとともに、ｂ＝250mmの
距離に対応する受光素子６3を中心に５つの受光
素子６1〜６5を配置している。また、上記各受光
素子６1〜６5間の距離は原稿サイズに対応してC1
＝44mm，C2＝48mm，C3＝75mm，C4＝45mmである。
すなわち、実験装置における発光素子５3と受光
素子６1〜６5は、第１図の装置と実質的に同等の
関係となるように配置される。
実験結果を第４図に示す。横軸に受光素子６3
を中心に他の受光素子までの距離、縦軸に各受光
素子の光出力電流をとつている。ここでＳ／Ｎ比
を並記しているが、この場合のＮはクロストーク
光によるものである。
第３図、第４図より明らかなように、隣接発光
素子の影響によるＳ／Ｎは9.8になり、１つおき
に位置する発光素子の影響によるＳ／Ｎは176と
なる。実験において、Ｎは先に述べたように、対
向する発光素子以外からクロストーク光として入
射される光出力を測定したものであるが、実際の
Ｎは更に原稿有り時の散乱による入力光が加え合
わされる。そして、発光素子自身の発光強度が
500％の範囲でばらつく。このばらつきを考慮す
ると、隣接発光素子の影響によるＳ／Ｎは1.96
に、１つおきに位置する発光素子の影響による
Ｓ／Ｎは35.2になる。
以上から少なくとも１つおきに位置する発光素
子の影響は無視できるが、隣接発光素子によるク
ロストーク光を無視することができず、原稿の有
無検知ができないような事態を生じる。
〈発明の目的〉
本発明は、このようなクロストーク光の影響を
除去して、正確な原稿有無により各種サイズを検
出できるような装置を提供することを目的とす
る。
〈実施例〉
第５図は第１図、第２図で説明した装置に適用
される本実施例の電気回路例を示す図である。
タイミング発生回路１１は発振器１２、Ｄ型フ
リツプフロツプ１３等を含んでなり、位相を180°
ずらしたタイミング信号１１ａ，１１ｂを発生す
る。タイミング信号１１ａ，１１ｂはそれぞれ発
光素子ドライブ回路１４ａ，１４ｂに入力され、
直列接続された発光素子５1，５3，５5と５2，５4
を交互に駆動する。上記発光素子ドライブ波形
ａ，ｂを示すと第６図のタイムチヤートのとおり
であり、隣接する発光素子どうしは同時に発光す
ることがなく、発光素子５1，５3，５5が発光
（又は消灯）しているとき、隣接する発光素子５
２，５4は消灯（又は発光）するようになり、いわ
ゆる1/2時分割のパルス駆動で発光を行なう。
受光素子６1〜６5側は、それぞれ増巾回路１５
１〜１５5、比較回路１６1〜１６5、ラツチ回路１
７1〜１７5を接続し、増巾回路１５により各受光
素子６の光出力電流を増幅するとともに、比較回
路１６において基準回路１８からの基準値と比較
し、比較結果をタイミング発生回路１１のタイミ
ング信号１１ａ，１１ｂに従つてラツチ回路１７
に取り込んでいる。ラツチ回路１７1，１７3，１
７5はタイミング信号１１ａをインバータ１９ａ
で反転した信号の立下りエツヂで、またラツチ回
路１７2，１７4はタイミング信号１１ｂをインバ
ータ１９ｂで反転した信号の立下りエツヂで比較
結果を取り込む。すなわち、これらは発光素子５
の発光時点から所定の遅延時間を与えて、発光に
伴う受光出力の比較結果を取り込む。
遅延回路２０1〜２０4は、ラツチ回路１７5の
出力によつて原稿カバー２の開閉をモニターする
間、ラツチ回路１７1〜１７4の出力を保持するも
ので、判定回路２１では、原稿カバー２が閉じら
れたことを確認してその時の各遅延回路２０1〜
２０4の出力状況を見て原稿サイズを判定する。
上記により、他の発光素子のクロストーク光に
よるＳ／Ｎは１つおきに位置するクロストークの
みとなり、先の具体例では、最悪でもＳ／Ｎが
35.2となり、その影響を無視することができる。
つまり、上記によりＳ／Ｎを大きくでき、原稿の
有無の判別を18倍にアツプすることができる。
以上の実施例では1/2時分割でパルス駆動した
が、1/2時分割のみならず、1/3，1/4，1/5時分割
と、その原稿サイズ検出装置の条件に応じて時分
割数を変えることができる。また、例えば、本実
施例において、第７図のタイムチヤートに示すよ
うに、1/5時分割して、全ての発光素子の発光タ
イミングをずらすことにより、クロストーク光に
よるＳ／Ｎを無限下にし、その影響を皆無にする
回路構成も可能である。
〈発明の効果〉
以上説明したように本発明による原稿サイズ検
出装置によれば、発光素子からの光を原稿台を透
過させて受光素子にて受光させる光路を確立し、
受光の有無により原稿サイズを判別するようにし
たものであるから、原稿が黒つぽいものや、色も
のの原稿においてもSN比を充分に大きくでき、
正確な原稿サイズ検出を行える。
また、発光及び受光素子からなら各センサにお
いて、隣接するセンサをそれぞれ時間をずらせて
駆動することから、隣接するセンサ間における光
によるクロストークによる影響を無視でき、さら
にSN比を高め、より確実なる原稿サイズ検出が
望める。[Table] According to the above configuration, in the process of closing the document cover 2, the size of the document is detected in a predetermined inclined state of the document cover 2, so even thick documents can be detected without any problem. This allows the document detection function to be used over a wide range of applications. In addition, since the document size is detected based on the combination of the presence or absence of reflected light from the reflective surface 4, which has high reflection efficiency, it is possible to reliably detect documents that have poor reflection efficiency due to light absorption, resulting in high accuracy. Detection operations can be performed. By the way, in the above-described device, when a plurality of light emitting elements 5 1 to 5 5 emit light at the same time, the light that enters the light receiving elements 6 1 to 6 5 is not only the light of the light emitting elements facing one to one, but also the light of other light emitting elements. There is crosstalk light from the light emitting elements. If the input optical signal when there is no original is S, and the input optical signal when there is an original is N, then
Due to the above-mentioned crosstalk light, the signal ratio S/N between when there is a document and when there is no document deteriorates, and there is a problem that it becomes impossible to distinguish between these cases. Figure 3 shows an outline of the experimental setup for measuring crosstalk light, with a light emitting element 5 in the center.
Attach one light-shielding plate A having a slit at a distance of a = 20 mm from the light emitting element 5 3 , and place a light receiving element corresponding to a distance of b = 250 mm, imitating the device shown in Fig. 1 . Five light receiving elements 6 1 to 6 5 are arranged around 6 3 . Also, the distance between each of the light receiving elements 6 1 to 6 5 is C 1 depending on the original size.
= 44mm, C 2 = 48mm, C 3 = 75mm, and C 4 = 45mm.
That is, the light emitting element 5 3 and the light receiving elements 6 1 to 6 5 in the experimental apparatus are arranged in substantially the same relationship as in the apparatus shown in FIG. The experimental results are shown in Figure 4. The horizontal axis shows the light receiving element 6 3
The distance to other light-receiving elements is plotted at the center, and the optical output current of each light-receiving element is plotted on the vertical axis. Although the S/N ratio is also shown here, N in this case is due to crosstalk light. As is clear from FIGS. 3 and 4, the S/N due to the influence of adjacent light emitting elements is 9.8, and the S/N due to the influence of every other light emitting element is 176. In the experiment, as mentioned earlier, N is the optical output measured as crosstalk light from sources other than the facing light emitting elements, but the actual N is determined by the addition of input light due to scattering when there is a document present. be combined. Then, the emission intensity of the light emitting element itself is
It varies within a range of 500%. Considering this variation, the S/N due to the influence of adjacent light emitting elements is 1.96
In this case, the S/N due to the influence of the light emitting elements located every other place is 35.2. From the above, although the influence of at least every other light emitting element can be ignored, crosstalk light from adjacent light emitting elements cannot be ignored, resulting in a situation where the presence or absence of a document cannot be detected. <Objective of the Invention> An object of the present invention is to provide an apparatus that can eliminate the influence of such crosstalk light and accurately detect various sizes based on the presence or absence of a document. <Embodiment> FIG. 5 is a diagram showing an example of an electric circuit of this embodiment applied to the apparatus described in FIGS. 1 and 2. The timing generation circuit 11 includes an oscillator 12, a D-type flip-flop 13, etc., and has a phase shift of 180°.
Shifted timing signals 11a and 11b are generated. Timing signals 11a and 11b are input to light emitting element drive circuits 14a and 14b, respectively.
Light emitting elements 5 1 , 5 3 , 5 5 and 5 2 , 5 4 connected in series
are driven alternately. The above light emitting element drive waveforms a and b are as shown in the time chart in Fig. 6. Adjacent light emitting elements do not emit light at the same time, and light emitting elements 5 1 , 5 3 , 5 5 emit light (or turn off). ), the adjacent light emitting element 5
2 and 5 4 turn off (or emit light), and emit light in a so-called 1/2 time division pulse drive. Each of the light receiving elements 6 1 to 6 5 has an amplifying circuit 15.
1 to 15 5 , comparison circuit 16 1 to 16 5 , latch circuit 1
7 1 to 17 5 are connected, and the optical output current of each light receiving element 6 is amplified by the amplification circuit 15 , and compared with the reference value from the reference circuit 18 in the comparison circuit 16 , and the comparison result is sent to the timing generation circuit 11 . Latch circuit 17 according to timing signals 11a and 11b
is being incorporated into the Latch circuit 17 1 , 17 3 , 1
7 5 connects the timing signal 11a to the inverter 19a
The latch circuits 17 2 and 17 4 take in the comparison result at the falling edge of the signal obtained by inverting the timing signal 11b by the inverter 19b. That is, these are the light emitting elements 5
A predetermined delay time is given from the time of light emission, and the comparison result of the light reception output accompanying the light emission is taken in. The delay circuits 20 1 to 20 4 hold the outputs of the latch circuits 17 1 to 17 4 while monitoring the opening and closing of the document cover 2 based on the output of the latch circuit 17 5 . 2 is closed, and each delay circuit 20 1 ~
20 Determine the original size by looking at the output status of 4 . As a result of the above, the S/N due to the crosstalk light of other light emitting elements is only the crosstalk located every other light emitting element, and in the previous specific example, at worst the S/N is
35.2, and its effect can be ignored.
In other words, the S/N ratio can be increased by the above method, and the determination of the presence or absence of a document can be increased by 18 times. In the above embodiment, pulse driving was performed in 1/2 time division, but it is possible to drive not only in 1/2 time division, but also in 1/3, 1/4, and 1/5 time division, depending on the conditions of the document size detection device. The number of time divisions can be changed. For example, in this embodiment, as shown in the time chart of FIG. 7, by dividing the light emission timing of all the light emitting elements into 1/5 time, the S/N due to crosstalk light can be infinitely reduced. It is also possible to create a circuit configuration that completely eliminates this effect. <Effects of the Invention> As explained above, according to the document size detection device according to the present invention, an optical path is established in which the light from the light emitting element is transmitted through the document table and is received by the light receiving element,
Since the document size is determined based on the presence or absence of light reception, the SN ratio can be sufficiently increased even for dark or colored documents.
Accurate document size detection is possible. In addition, since the light emitting and light receiving elements drive adjacent sensors at different times in each sensor, the effects of crosstalk due to light between adjacent sensors can be ignored, further increasing the S/N ratio and providing more reliable It is possible to detect the original size.
第１図は本発明の背景となつた装置例を示す要
部斜視図、第２図は第１図の光路を説明する図、
第３図はクロストーク光測定の実験装置の概要を
示す図、第４図は実験結果を示す測定線図、第５
図は本発明の一実施例における電気回路図、第６
図は第５図の要部信号波形例を示すタイムチヤー
ト、第７図は他の実施例におけるタイミング例を
示すタイムチヤートである。
１……透明板、２……原稿カバー、４……反射
面、５（５1〜５5）……発光素子、６（６1〜６
５）……受光素子、１１……タイミング発生回路、
１４ａ・１４ｂ……発光素子ドライブ回路、１５
（１５1〜１５5）……増巾回路、１６（１６1〜１
６5）……比較回路、１７（１７1〜１７5）……
ラツチ回路。
FIG. 1 is a perspective view of essential parts showing an example of a device that forms the background of the present invention, FIG. 2 is a diagram explaining the optical path of FIG. 1,
Figure 3 is a diagram showing the outline of the experimental equipment for crosstalk light measurement, Figure 4 is a measurement diagram showing the experimental results, and Figure 5 is a diagram showing the outline of the experimental equipment for crosstalk light measurement.
The figure is an electrical circuit diagram in one embodiment of the present invention, No. 6
The figure is a time chart showing an example of the main signal waveform of FIG. 5, and FIG. 7 is a time chart showing an example of timing in another embodiment. DESCRIPTION OF SYMBOLS 1... Transparent plate, 2... Document cover, 4... Reflective surface, 5 (5 1 to 5 5 )... Light emitting element, 6 (6 1 to 6
5 )... Light receiving element, 11... Timing generation circuit,
14a, 14b...Light emitting element drive circuit, 15
(15 1 to 15 5 )...Width increasing circuit, 16 (16 1 to 1
6 5 )... Comparison circuit, 17 (17 1 to 17 5 )...
latch circuit.
Claims (1)
に載置される原稿を覆う開閉可能な原稿カバー
と、 上記原稿台に載置される原稿のサイズに応じて
該原稿台下部に配置された発光及び受光素子から
なる複数のセンサと、 上記原稿カバーの上記原稿台面と対向する面に
設けられ、該原稿カバーが所定角度の範囲に開放
された状態で、上記発光素子からの光を上記原稿
台を透過して上記受光素子へと反射により導く光
路を確立するための光路設定手段と、 隣接する上記各センサを時間をずらせて駆動す
る駆動手段と、 上記時間をずらせて駆動された各センサの受光
素子の受光有無に応じて原稿サイズを判定するサ
イズ判定手段と、 を備えたことを特徴とする原稿サイズ検出装
置。[Scope of Claims] A document cover that can be opened and closed to cover a document placed on a transparent document table provided at the top of the copying machine main body; A plurality of sensors consisting of light-emitting and light-receiving elements are arranged at the bottom of the document table, and a plurality of sensors are provided on the surface of the document cover facing the document table surface, and when the document cover is opened to a predetermined angle range, an optical path setting means for establishing an optical path for guiding the light from the element through the document table to the light receiving element by reflection; a driving means for driving each of the adjacent sensors at different times; A document size detection device comprising: size determination means for determining the document size according to whether light is received by light receiving elements of the respective sensors that are driven in a staggered manner.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13210483A JPS6023845A (en) | 1983-07-19 | 1983-07-19 | Detector for original size |
| US06/571,187 US4614874A (en) | 1983-01-21 | 1984-01-16 | Original document size detecting arrangement |
| DE3401674A DE3401674C2 (en) | 1983-01-21 | 1984-01-19 | Device for determining the size of copy templates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13210483A JPS6023845A (en) | 1983-07-19 | 1983-07-19 | Detector for original size |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6023845A JPS6023845A (en) | 1985-02-06 |
| JPH0514260B2 true JPH0514260B2 (en) | 1993-02-24 |
Family
ID=15073541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13210483A Granted JPS6023845A (en) | 1983-01-21 | 1983-07-19 | Detector for original size |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6023845A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61284752A (en) * | 1985-06-11 | 1986-12-15 | Sharp Corp | Original size detecting device |
| JPH068971B2 (en) * | 1986-03-06 | 1994-02-02 | シャープ株式会社 | Copier with document detection function |
| JP2676364B2 (en) * | 1988-05-11 | 1997-11-12 | キヤノン株式会社 | Document detection device |
| JP2535279B2 (en) * | 1992-01-11 | 1996-09-18 | スター精密株式会社 | Photo detector |
| DE69321405T2 (en) * | 1992-07-10 | 1999-05-12 | Sharp K.K., Osaka | Document size detection system to be used in a document reader |
| JP4877776B2 (en) * | 2006-10-26 | 2012-02-15 | シャープ株式会社 | Document size detection apparatus, document reading apparatus, and image forming apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52123648A (en) * | 1976-04-07 | 1977-10-18 | Siemens Ag | Thickness measuring device |
| JPS5662274A (en) * | 1979-10-24 | 1981-05-28 | Konishiroku Photo Ind Co Ltd | Original size detector of copying machine |
-
1983
- 1983-07-19 JP JP13210483A patent/JPS6023845A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52123648A (en) * | 1976-04-07 | 1977-10-18 | Siemens Ag | Thickness measuring device |
| JPS5662274A (en) * | 1979-10-24 | 1981-05-28 | Konishiroku Photo Ind Co Ltd | Original size detector of copying machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6023845A (en) | 1985-02-06 |
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