JP2004058291A

JP2004058291A - Printer, central position of disc detection control program

Info

Publication number: JP2004058291A
Application number: JP2002216196A
Authority: JP
Inventors: Katsuhiko Nishisaka; 西坂　勝彦
Original assignee: Seiko Epson Corp
Current assignee: Seiko Epson Corp
Priority date: 2002-07-25
Filing date: 2002-07-25
Publication date: 2004-02-26
Anticipated expiration: 2022-07-25
Also published as: JP3900270B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer in which positional detection of an optical recording disc for setting a print area can be carried out in a short time with high accuracy while lowering the possibility of damaging the label surface of the optical recording disc. <P>SOLUTION: With regard to a right triangle A defined by an outer circumferential edge LE, an intermediate point SP and an outer circumferential edge TE, the length of the bottom side Ax and the height Ay are determined, and then the length of the oblique side Yo is determined from the Ax and Ay. With regard to a right triangle B defined by the intermediate point of the oblique side Yo, the outer circumferential edge TE and the central point CP, the height By is determined and the ratio of similitude between the right triangles A and B is determined from the height Ay of the right triangle A and the height By of the right triangle B. Subsequently, the length of the oblique side Bo is determined from the ratio of similitude and the central point CP of an optical disc 11 is determined from the length of the oblique side Bo. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本願発明は、ＣＤ−Ｒ等の光記録ディスクのラベル面に印刷を実行する、いわゆるＣＤ−Ｒ印刷機能を備えた印刷装置、及び光記録ディスクのラベル面に印刷を実行する際の印刷実行領域を決定する基準となる光記録ディスクの中心点を検出するディスク中心点検出制御プログラムに関する。
【０００２】
【従来の技術】
ＣＤ−Ｒ等の円板形状を有する光記録ディスクは、印刷面と反対側面、いわゆるラベル面の所定の領域に、その光記録ディスクに印刷されている情報等の書き込みが可能になっている。そして、このラベル面に印刷を行う印刷装置については、特開平１１−５３３２号公報にて、印刷方法については、特許第２７９４６２８号公報にて開示されている。また、国際公開第ＷＯ９７／１１８５０号公報にて、光記録ディスクをディスクトレイに装着し、そのディスクトレイを搬送して印刷を行う印刷装置が開示されている。これは、矩形形状の薄い板からなる光記録ディスクのディスクトレイの中央に形成した浅い円形溝からなる装着部に光記録ディスクを装着し、光記録ディスクを装着したディスクトレイを搬送ローラにて搬送して印刷ヘッドにて光記録ディスクのラベル面に印刷を行うものである。
【０００３】
しかし、上記従来技術による印刷装置および印刷方法においては、印刷を実行する光記録ディスクの正確な位置を検出する手段については、何ら開示されておらず、光記録ディスクの位置と印刷実行範囲にズレが生じてもそのまま印刷を実行してしまうことによって、印刷の位置がズレたり、印刷範囲が光記録ディスクのラベル面の印刷可能領域外にはみ出し、インクで光記録ディスクを汚してしまうといった問題が生じやすくなってしまう。
【０００４】
そこで、このような課題を解決するための従来技術の一例としては、特開２００２−１２７５３０号公報にて、ディスクトレイに装着した光記録ディスクの中心孔が嵌合している凸部を検出し、その凸部の検出位置から光記録ディスクの中心位置を演算して求め、演算した光記録ディスクの中心位置に基づいて印刷実行範囲を決定する印刷装置が開示されている。また、ディスクトレイに目印等を設け、その目印位置を検出することによって、光記録ディスクの位置を演算して求める技術も公知となっている。
【０００５】
しかし、このように、光記録ディスクを装着したディスクトレイの一部、あるいは、ディスクトレイに付された目印等を検出することによって間接的に光記録ディスクの位置を検出するので、ディスクトレイに対する光記録ディスクの装着状態のずれや目印等の検出誤差によって、その印刷位置にわずかなずれが生じる虞があり、常に高い精度で光記録ディスクの所定の印刷位置へ印刷を実行することが出来ない。また、トレイの光記録ディスクの装着状態を検出することができないので、トレイに光記録ディスクを未装着の状態で印刷を実行してしまう虞がある。そのため、光記録ディスクを直接検出する手段によって、光記録ディスクの位置を正確に検出する技術が公知となっており、光記録ディスク上を主走査方向に往復動可能に配設された光記録ディスクを検出可能なセンサと、光記録ディスクを副走査方向（主走査方向と直交する方向）に搬送する手段とによって、センサで光記録ディスク上を走査して光記録ディスクを検出するものが挙げられる。例えば、図９に示したように、光記録ディスク１１の外周縁の先端ＴＥ、後端ＢＥ、左端ＬＥ、及び右端ＲＥの４カ所を検出し、４カ所の外周縁の検出位置から光記録ディスク１１の中心点ＣＰを求め、中心点ＣＰと各外周縁の位置とに基づいて印刷実行領域を設定する。このように、光記録ディスク１１を直接検出して印刷実行領域を設定するので、光記録ディスク１１のラベル面に対する印刷ずれが生じる虞がなく、ラベル面への印刷を常に高精度に実行することができる。
【０００６】
【発明が解決しようとする課題】
しかしながら、上述したように、光記録ディスク１１の外周縁の先端ＴＥ、後端ＢＥ、左端ＬＥ、及び右端ＲＥの４カ所を検出すると、センサの走査距離が長く、そのための光記録ディスク１１の副走査方向Ｙへの搬送動作、及びセンサの主走査方向Ｘへの往復動作等に多大な時間を要し、１枚の光記録ディスク１１のラベル面に印刷を実行するために必要な時間が長くなってしまうという問題があった。また、光記録ディスク１１の中心に形成されている中心孔１２上を走査するので、光記録ディスク１１の外周縁と中心孔１２の内周縁とがセンサにて検出されることになる。したがって、中心孔１２の内周縁を外周縁として誤検出しないためのセンサのマスク処理等が必要になり、光記録ディスク１１の検出手順が複雑になってしまうという問題があった。
【０００７】
さらに、光記録ディスク１１のラベル面に傷が付くと、光記録ディスク１１の印刷データが読み取れなくなってしまう虞がある。通常は起こりえないが、例えば、光記録ディスク１１が搬送ローラ等の搬送手段によって搬送される際に、ラベル面に付着した小さなゴミ等が搬送ローラと光記録ディスク１１のラベル面との間に挟まれ、それによって、希にラベル面に傷が付いてしまうことがある。したがって、図９に示したように光記録ディスク１１の先端ＴＥから後端ＢＥまで光記録ディスク１１を走査すると、その間、光記録ディスク１１が搬送手段によって搬送されるので、光記録ディスク１１のラベル面に印刷するときのみならず、光記録ディスク１１の位置を検出する際にも光記録ディスク１１の先端ＴＥから後端ＢＥまでの全領域にわたって光記録ディスク１１のラベル面に傷が付く虞が生じてしまい、決して好ましいと言えるものではなかった。
【０００８】
本願発明は、このような状況に鑑み成されたものであり、その課題は、印刷実行領域を設定するための光記録ディスクの位置検出を高精度で短時間に実行可能であり、かつ光記録ディスクの位置検出の際に光記録ディスクのラベル面を傷付けてしまう虞がより少ない印刷装置を提供することにある。
【０００９】
【課題を解決するための手段】
上記課題を達成するため、本願請求項１に記載の発明は、光記録ディスクの中心点の位置に基づいて前記光記録ディスクのラベル面に設定した印刷領域に印刷を実行する光記録ディスク印刷手段と、前記光記録ディスク上を主走査方向に走査可能に配設され、前記光記録ディスクの外周縁を検出可能なディスク外周縁検出手段と、前記光記録ディスクを副走査方向に搬送するディスク搬送手段と、前記ディスク外周縁検出手段、及び前記ディスク搬送手段とを制御して前記光記録ディスクの中心点の位置を検出するディスク中心点検出制御手段とを備えた印刷装置であって、前記ディスク中心点検出制御手段は、前記光記録ディスクの外周縁を３カ所検出し、検出した３カ所の外周縁の位置に基づいて前記光記録ディスクの中心点の位置を検出する、ことを特徴とした印刷装置である。
【００１０】
円の中心点は円周上の３点の位置から求めることができるので、光記録ディスクの外周縁を３カ所検出し、検出した３カ所の外周縁の位置に基づいて光記録ディスクの中心点の位置を検出することができる。したがって、従来のように光記録ディスクの先後端、及び左右端の計４カ所の外周縁を検出するより、光記録ディスクの外周縁を検出するセンサ等の検出手段による走査量を少なくすることができるので、光記録ディスクの外周縁の検出時間を短くすることが可能になり、光記録ディスクの中心点の検出時間を短くすることができる。また、光記録ディスクの外周縁を検出するセンサ等の検出手段による走査量を少なくすることができるので、ディスク搬送手段による搬送量が少なくなり、それによって、ディスク搬送手段によって光記録ディスクが搬送される際にラベル面に傷が付いてしまう虞を少なくすることができる。
【００１１】
これにより、本願請求項１に記載の発明に係る印刷装置によれば、光記録ディスクの中心点の検出時間を短くすることができるとともに、ディスク搬送手段によって光記録ディスクが搬送される際にラベル面に傷が付いてしまう虞を少なくすることができるので、印刷実行領域を設定するための光記録ディスクの位置検出を高精度で短時間に実行でき、かつ光記録ディスクの位置検出の際に光記録ディスクのラベル面を傷付ける虞をより少なくすることができるという作用効果が得られる。
【００１２】
本願請求項２に記載の発明は、請求項１において、前記ディスク中心点検出制御手段は、前記ディスク外周縁検出手段にて前記光記録ディスクの副走査方向下流側の外周縁を検出して前記光記録ディスクを検出する光記録ディスク検出手段と、該光記録ディスク検出手段にて前記光記録ディスクの外周縁を検出後、所定の搬送量だけ前記光記録ディスクを搬送して停止させた後、前記ディスク外周縁検出手段にて前記光記録ディスクを主走査方向に走査して、走査線上の前記光記録ディスクの両外周縁をそれぞれ検出する第１の外周縁検出手段と、該第１の外周縁検出手段にて検出した前記光記録ディスクの両外周縁間の中間点に前記ディスク外周縁検出手段の検出点を移動させた後、前記光記録ディスクを副走査方向と反対方向に搬送して再び前記光記録ディスクの副走査方向下流側の外周縁を前記ディスク外周縁検出手段にて検出する第２の外周縁検出手段とを有し、前記第１の外周縁検出手段によって検出した２カ所の外周縁の位置と、前記第２の外周縁検出手段によって検出した外周縁の位置とから前記光記録ディスクの中心点の位置を演算する、ことを特徴とした印刷装置である。
【００１３】
まず、光記録ディスクの外周縁を検出可能なディスク外周縁検出手段によって、光記録ディスクの副走査方向下流側の外周縁を検出する。この副走査方向下流側の外周縁は、副走査方向の最下流側の外周縁である必要はなくその近傍で十分である。これによって、まず、光記録ディスクのおおよその位置を検出し、この検出した外周縁を起点に光記録ディスクの中心点を検出するための３カ所の外周縁を検出していく。
【００１４】
次に、所定の搬送量だけ光記録ディスクを搬送して停止させた後、ディスク外周縁検出手段にて光記録ディスクを主走査方向に走査して、走査線上の光記録ディスクの両外周縁をそれぞれ検出する。つづいて、その両外周縁の中間点までディスク外周縁検出手段の検出点を移動させた後、光記録ディスクを副走査方向と反対方向に搬送して再び光記録ディスクの副走査方向下流側の外周縁を検出する。同じ主走査線上の両外周縁の中間点は、副走査方向における光記録ディスクの中心軸線上となる。
【００１５】
したがって、その中間点にディスク外周縁検出手段の検出点を移動させた後、光記録ディスクを副走査方向と反対方向に搬送して検出した光記録ディスクの外周縁は、副走査方向における光記録ディスクの最下流側に位置する外周縁となる。そして、その外周縁に対して残りの２つの外周縁は、同じ主走査線上に位置しているので、副走査方向における光記録ディスクの中心軸線に対して線対称となる位置関係にあることになる。
【００１６】
これにより、本願請求項２に記載の発明に係る印刷装置によれば、本願請求項１に記載の発明による作用効果に加えて、検出した３つの外周縁が上述した位置関係となっていることによって、光記録ディスクの中心点位置の演算を容易にすることができるという作用効果が得られる。
【００１７】
本願請求項３に記載の発明は、請求項２において、前記第１の外周縁検出手段は、前記光記録ディスクの外周縁を検出後、前記ディスク外周縁検出手段にて前記光記録ディスクを主走査方向に走査する際に、前記光記録ディスクの中心孔を走査することなく前記光記録ディスクの両外周縁を検出することが可能な位置まで前記光記録ディスクを搬送する、ことを特徴とした印刷装置である。
【００１８】
このように、ディスク外周縁検出手段にて光記録ディスクを主走査方向に走査する際に、光記録ディスクの中心孔を走査しないようにすることで、中心孔の内周縁を外周縁として誤検出してしまうことがない。したがって、本願請求項３に記載の発明に係る印刷装置によれば、本願請求項２に記載の発明による作用効果に加えて、例えば、ディスク外周縁検出手段の検出点が中心孔の近傍を走査している間に検出したディスク縁を中心孔の内周縁とみなして無視するといった手段が不要になるという作用効果が得られる。
【００１９】
本願請求項４に記載の発明は、請求項２において、前記第１の外周縁検出手段は、前記光記録ディスクの外周縁を検出後、前記ディスク外周縁検出手段にて前記光記録ディスクを主走査方向に走査する際に、前記光記録ディスク検出手段にて検出した前記光記録ディスクの外周縁と前記光記録ディスクの中心孔との間を走査可能な位置まで前記光記録ディスクを搬送する、ことを特徴とした印刷装置である。
【００２０】
本願請求項４に記載の発明に係る印刷装置によれば、本願請求項２に記載の発明による作用効果に加えて、ディスク外周縁検出手段にて光記録ディスクを主走査方向に走査する際に、光記録ディスク検出手段にて検出した光記録ディスクの外周縁と光記録ディスクの中心孔との間を走査して、光記録ディスクの中心孔を走査しないようにすることで、中心孔の内周縁を外周縁として誤検出してしまうことを無くすことができるとともに、光記録ディスクの搬送量を少なくすることができるという作用効果が得られる。
【００２１】
本願請求項５に記載の発明は、請求項１〜４のいずれか１項において、前記ディスク中心点検出制御手段は、検出した３カ所の前記光記録ディスクの外周縁を、Ａ点、Ｂ点、及びＣ点とし、Ａ点とＣ点とを結んだ線分の垂直二等分線と、Ｂ点とＣ点とを結んだ線分の垂直二等分線との交点の位置を演算することによって前記光記録ディスクの中心点の位置を検出する、ことを特徴とした印刷装置である。
【００２２】
同じ円周上の３点をＡ点、Ｂ点、及びＣ点とすると、Ａ点とＣ点とを結んだ線分の垂直二等分線と、Ｂ点とＣ点とを結んだ線分の垂直二等分線との交点が円の中心点となる。したがって、本願請求項５に記載の発明に係る印刷装置によれば、検出した３カ所の前記光記録ディスクの外周縁をＡ点、Ｂ点、及びＣ点とし、Ａ点とＣ点とを結んだ線分の垂直二等分線と、Ｂ点とＣ点とを結んだ線分の垂直二等分線との交点の位置を演算することによって光記録ディスクの中心点を演算することができる。
【００２３】
本願請求項６に記載の発明は、請求項２〜４のいずれか１項において、前記ディスク中心点検出制御手段は、前記第１の外周縁検出手段によって検出した前記光記録ディスクの両外周縁をＡ点、及びＢ点とし、前記第２の外周縁検出手段によって検出した前記光記録ディスクの外周縁をＣ点とし、Ａ点とＢ点との間の中間点をＤ点とし、Ａ点とＣ点との間の中間点をＥ点とし、相似するＡ点、Ｃ点、及びＤ点で形成される第１の直角三角形と、Ｃ点、Ｅ点、及び前記光記録ディスクの中心点で形成される第２の直角三角形との相似比を、Ａ点とＣ点との間の長さに乗算してＣ点から前記光記録ディスクの中心点までの長さを求めることによって、前記光記録ディスクの中心点の位置を検出する、ことを特徴とした印刷装置である。
【００２４】
まず、第１の外周縁検出手段によって検出した光記録ディスクの両外周縁をＡ点、及びＢ点とし、第２の外周縁検出手段によって検出した光記録ディスクの外周縁をＣ点とする。さらに、Ａ点とＢ点との間の中間点をＤ点とし、Ａ点とＣ点との間の中間点をＥ点とする。すると、Ａ点、Ｃ点、及びＤ点で形成される第１の直角三角形と、Ｃ点、Ｅ点、及び光記録ディスクの中心点で形成される第２の直角三角形とは、相似の直角三角形となる。したがって、その相似比を求めて、第２の直角三角形のＣ点と光記録ディスクの中心点とを結んだ辺に対応する第１の直角三角形のＡ点とＣ点とを結んだ辺の長さに相似比を乗算することによって、第２の直角三角形のＣ点と光記録ディスクの中心点とを結んだ辺の長さを求めることができ、それによって、光記録ディスクの中心点の位置を求めることができる。
【００２５】
本願請求項７に記載の発明は、光記録ディスクの中心点の位置に基づいて前記光記録ディスクのラベル面に設定した印刷領域に印刷を実行するラベル面印刷手段と、前記光記録ディスク上を主走査方向に走査可能に配設され、前記光記録ディスクの外周縁を検出可能なディスク外周縁検出手段と、前記光記録ディスクを副走査方向に搬送するディスク搬送手段とを備えた印刷装置において、前記ディスク外周縁検出手段、及び前記ディスク搬送手段とを制御して前記光記録ディスクの中心点の位置を検出する制御をコンピュータに実行させるためのディスク中心点検出制御プログラムであって、前記光記録ディスクの外周縁を３カ所検出する手順と、検出した３カ所の外周縁の位置に基づいて前記光記録ディスクの中心点の位置を検出する手順とを有する、ことを特徴としたディスク中心点検出制御プログラムである。
【００２６】
本願請求項７に記載の発明に係るディスク中心点検出制御プログラムによれば、前述した本願請求項１に記載の発明と同様の作用効果を得ることができるとともに、このディスク中心点検出制御プログラムを実行することができる任意の印刷装置に、前述した本願請求項１に記載の発明と同様の作用効果をもたらすことができる。
【００２７】
本願請求項８に記載の発明は、請求項７において、前記ディスク外周縁検出手段にて前記光記録ディスクの副走査方向下流側の外周縁を検出して前記光記録ディスクを検出する光記録ディスク検出手順と、該光記録ディスク検出手順にて前記光記録ディスクの外周縁を検出後、所定の搬送量だけ前記光記録ディスクを搬送して停止させた後、前記ディスク外周縁検出手段にて前記光記録ディスクを主走査方向に走査して、走査線上の前記光記録ディスクの両外周縁をそれぞれ検出する第１の外周縁検出手順と、該第１の外周縁検出手順にて検出した前記光記録ディスクの両外周縁間の中間点に前記ディスク外周縁検出手段の検出点を移動させた後、前記光記録ディスクを副走査方向と反対方向に搬送して再び前記光記録ディスクの副走査方向下流側の外周縁を前記ディスク外周縁検出手段にて検出する第２の外周縁検出手順と、前記第１の外周縁検出手順によって検出した２カ所の外周縁の位置と、前記第２の外周縁検出手順によって検出した外周縁の位置とから前記光記録ディスクの中心点の位置を演算する手順とを有する、ことを特徴としたディスク中心点検出制御プログラムである。
【００２８】
本願請求項８に記載の発明に係るディスク中心点検出制御プログラムによれば、前述した本願請求項２に記載の発明と同様の作用効果を得ることができるとともに、このディスク中心点検出制御プログラムを実行することができる任意の印刷装置に、前述した本願請求項２に記載の発明と同様の作用効果をもたらすことができる。
【００２９】
本願請求項９に記載の発明は、請求項８において、前記第１の外周縁検出手順は、前記光記録ディスクの外周縁を検出後、前記ディスク外周縁検出手段にて前記光記録ディスクを主走査方向に走査する際に、前記光記録ディスクの中心孔を走査することなく前記光記録ディスクの両外周縁を検出することが可能な位置まで前記光記録ディスクを搬送する、ことを特徴としたディスク中心点検出制御プログラムである。
【００３０】
本願請求項９に記載の発明に係るディスク中心点検出制御プログラムによれば、前述した本願請求項３に記載の発明と同様の作用効果を得ることができるとともに、このディスク中心点検出制御プログラムを実行することができる任意の印刷装置に、前述した本願請求項３に記載の発明と同様の作用効果をもたらすことができる。
【００３１】
本願請求項１０に記載の発明は、請求項８において、前記第１の外周縁検出手順は、前記光記録ディスクの外周縁を検出後、前記ディスク外周縁検出手段にて前記光記録ディスクを主走査方向に走査する際に、前記光記録ディスク検出手順にて検出した前記光記録ディスクの外周縁と前記光記録ディスクの中心孔との間を走査可能な位置まで前記光記録ディスクを搬送する、ことを特徴としたディスク中心点検出制御プログラムである。
【００３２】
本願請求項１０に記載の発明に係るディスク中心点検出制御プログラムによれば、前述した本願請求項４に記載の発明と同様の作用効果を得ることができるとともに、このディスク中心点検出制御プログラムを実行することができる任意の印刷装置に、前述した本願請求項４に記載の発明と同様の作用効果をもたらすことができる。
【００３３】
本願請求項１１に記載の発明は、請求項７〜１０のいずれか１項において、検出した３カ所の前記光記録ディスクの外周縁を、Ａ点、Ｂ点、及びＣ点とし、Ａ点とＣ点とを結んだ線分の垂直二等分線と、Ｂ点とＣ点とを結んだ線分の垂直二等分線との交点の位置を演算することによって前記光記録ディスクの中心点の位置を検出する手順を有する、ことを特徴としたディスク中心点検出制御プログラムである。
【００３４】
本願請求項１１に記載の発明に係るディスク中心点検出制御プログラムによれば、前述した本願請求項５に記載の発明と同様の作用効果を得ることができるとともに、このディスク中心点検出制御プログラムを実行することができる任意の印刷装置に、前述した本願請求項５に記載の発明と同様の作用効果をもたらすことができる。
【００３５】
本願請求項１２に記載の発明は、請求項８〜１０のいずれか１項において、前記第１の外周縁検出手段によって検出した前記光記録ディスクの両外周縁をＡ点、及びＢ点とし、前記第２の外周縁検出手段によって検出した前記光記録ディスクの外周縁をＣ点とし、Ａ点とＢ点との間の中間点をＤ点とし、Ａ点とＣ点との間の中間点をＥ点とし、相似するＡ点、Ｃ点、及びＤ点で形成される直角三角形と、Ｃ点、Ｅ点、及び前記光記録ディスクの中心点で形成される直角三角形との相似比を、Ａ点とＣ点との間の長さに乗算してＣ点から前記光記録ディスクの中心点までの長さを求めることによって、前記光記録ディスクの中心点の位置を検出する手順を有する、ことを特徴としたディスク中心点検出制御プログラムである。
【００３６】
本願請求項１２に記載の発明に係るディスク中心点検出制御プログラムによれば、前述した本願請求項６に記載の発明と同様の作用効果を得ることができるとともに、このディスク中心点検出制御プログラムを実行することができる任意の印刷装置に、前述した本願請求項６に記載の発明と同様の作用効果をもたらすことができる。
【００３７】
【発明の実施の形態】
以下、本願発明の一実施の形態を図面に基づいて説明する。
図１は、本願発明に係るインクジェット式印刷装置を示した斜視図である。
【００３８】
インクジェット式印刷装置５０は、給紙ボタン７を備える本体５と、本体５の前方側に形成される排紙部６とを備えている。尚、インクジェット式印刷装置５０は通常は用紙に印刷するためのものであり、用紙を被印刷材とする場合には本体５の後方側に用紙をストックするための給紙トレイを取り付けることができるようになっている。本体５の前方側にはディスクトレイ受入部３２が形成されており、ディスクトレイ受入部３２にはトレイアッタチメント３を前側から装着できるようになっている。トレイアッタチメント３は、左右両側に設けられるトレイ支持体３１と、トレイ支持体３１の内側に形成されたガイドに沿って前後方向にスライド可能に支持される、平板状で黒色のプラスチックで構成されたディスクトレイ２とを備えている。ディスクトレイ２上にはＣＤ−Ｒなどの印刷対象物となる光記録ディスク１１の収納部２２が形成されており、その中央には光記録ディスク１１の中央に形成された穴と同径の凸部２１が形成されている。この凸部２１は、光記録ディスク１１の中心孔１２が嵌合した状態で光記録ディスク１１を収納部２２に対して同心的に配置できるように形成されている。
【００３９】
図２は、本願発明に係るインクジェット式印刷装置５０を示した要部平面図である。図３は、その要部側面図である。
【００４０】
インクジェット式印刷装置５０には、キャリッジガイド軸５１に軸支され、制御部２０からの制御信号により、主走査方向Ｘに移動するキャリッジ６１が設けられている。該キャリッジ６１と対向してプラテン５２が設けられている。キャリッジ６１には、被印刷材としてのディスクトレイ２に装着された光記録ディスク１１のラベル面にインクを吐出して印刷を行う「ラベル面印刷手段」としての記録ヘッド６２が搭載され、キャリッジ６１を主走査方向Ｘに搬送し、キャリッジ６１とプラテン５２の間にディスクトレイ２に装着された光記録ディスク１１を副走査方向Ｙに搬送しながら、記録ヘッド６２が光記録ディスク１１のラベル面にインクを吐出することで光記録ディスク１１のラベル面に印刷が行われる。また、キャリッジ６１には、光記録ディスク１１の外周縁を検出する「ディスク外周縁検出手段」として、光記録ディスク１１の外周縁を検出可能なＰＷセンサ６３が搭載されている。このＰＷセンサ６３は、普通紙等の印刷用紙に印刷を実行する際には、印刷用紙の紙幅を検出するセンサとしても機能する。
【００４１】
また、インクジェット式印刷装置５０には、光記録ディスク１１を装着したディスクトレイ２を被印刷材として副走査方向Ｙに搬送する「ディスク搬送手段」として、搬送駆動ローラ５３と搬送従動ローラ５４が設けられている。搬送駆動ローラ５３は、制御部２０からの制御信号に基づいてステッピングモータ等の回転駆動力により回転制御され、搬送駆動ローラ５３の回転により、ディスクトレイ２は副走査方向Ｙに搬送される。搬送従動ローラ５４は複数設けられており、それぞれ個々に搬送駆動ローラ５３に付勢され、ディスクトレイ２が搬送駆動ローラ５３の回転により搬送される際に、ディスクトレイ２に接してディスクトレイ２の搬送に従動して回転する。尚、「ラベル面印刷手段」としての記録ヘッド６２は、記録ディスク１１のラベル面のみならず、普通紙等の印刷用紙を被印刷材として印刷する手段でもあり、「ディスク搬送手段」は、ディスクトレイ２のみならず、普通紙等の印刷用紙を被印刷材として搬送する手段でもあることは言うまでもないことである。
【００４２】
一方、印刷後の普通紙等の印刷用紙、又は光記録ディスク１１のラベル面に印刷を終えたディスクトレイ２を排出する印刷後の被印刷材の排出手段として、排出駆動ローラ５５と排出従動ローラ５６が設けられている。排出駆動ローラ５５は、ステッピングモータ等の回転駆動力により回転制御され、排出駆動ローラ５５の回転により、被印刷材は副走査方向Ｙに排出される。排出従動ローラ５６は複数設けられ、周囲に複数の歯を有し、各歯の先端が被印刷材の印刷面に点接触するように鋭角的に尖っている歯付きローラとなっており、それぞれ個々に排出駆動ローラ５５に搬送従動ローラ５４の付勢力よりも弱い付勢力で付勢され、被印刷材が排出駆動ローラ５５の回転により排出される際に、印刷面に接した状態で被印刷材の排出に従動して回転する。
【００４３】
ディスクトレイ受入部３２は、トレイアッタチメント３を挿入したときに、平板状のディスクトレイ２が排出駆動ローラ５５と排出従動ローラ５６との間及び搬送駆動ローラ５３と搬送従動ローラ５４との間に挟持されるように構成されており、これによりディスクトレイ２は搬送駆動ローラ５３及び排出駆動ローラ５５の駆動力を受けてトレイ支持体３１の間でインクジェット式印刷装置５０の前後方向に移動できるようになっている。
【００４４】
また、制御部２０は、前述した「ディスク外周縁検出手段」としてのＰＷセンサ６３を搭載したキャリッジ６１と、「ディスク搬送手段」としての搬送駆動ローラ５３とを制御して、ＰＷセンサ６３にて光記録ディスク１１上を主走査方向Ｘ及び副走査方向Ｙに走査してＰＷセンサ６３にて検出した光記録ディスク１１の外周縁の検出位置に基づいて光記録ディスク１１の中心点の位置を検出する「ディスク中心点検出制御手段」を有している。
【００４５】
つづいて、ディスクトレイ２に装着した光記録ディスク１１のラベル面に印刷をするために、インクジェット式印刷装置５０へディスクトレイ２を装着する手順と、装着後のディスクトレイ２に装着されている光記録ディスク１１の中心点の位置を検出する手順とについて説明する。
【００４６】
まず、インクジェット式印刷装置５０へディスクトレイ２を装着する手順について簡単に説明する。最初に、トレイアタッチメント３のトレイ支持体３１をディスクトレイ受入部３２から本体５内へ押し込んで装着する。その際に、搬送従動ローラ５４及び排出従動ローラ５６をレリース手段（図示せず）によってレリース状態にする。次に、ラベル面を上向きにした状態で光記録ディスク１１を装着したディスクトレイ２を本体５内へ一杯に押し込む。そして、搬送従動ローラ５４及び排出従動ローラ５６のレリース状態を解除してディスクトレイ２を搬送、排出可能な状態にする。
【００４７】
次に、ディスクトレイ２に装着されている光記録ディスク１１の中心点の位置を検出する手順について図４及び図５を参照しながら説明する。図４は、光記録ディスク１１の外周縁の位置を３カ所検出する手順を示したフローチャートである。図５は、光記録ディスク１１の外周縁の位置を３カ所検出する工程を模式的に示した光記録ディスク１１の平面図である。
【００４８】
制御部２０からの制御によって、キャリッジ６１を主走査方向Ｘに往復動させることによりＰＷセンサ６３が主走査方向Ｘへ往復動し、それによって、ＰＷセンサ６３にて光記録ディスク１１を主走査方向Ｘに走査することができる。また、同じく制御部２０からの制御によって、搬送従動ローラ５４が正転または逆転することによりディスクトレイ２が副走査方向Ｙ、又は副走査方向Ｙと逆方向へ移動し、それによって、ＰＷセンサ６３にて光記録ディスク１１を副走査方向Ｙ、又は副走査方向Ｙと逆方向に走査することができる。
【００４９】
まず、インクジェット式印刷装置５０にディスクトレイ２を装着した状態から給紙ボタン７を押すと、キャリッジ６１がホームポジションからＰＷセンサ６３の検出点が副走査方向Ｙの光記録ディスク１１の中心軸線上近傍に位置するまで移動する（ステップＳ１）。その状態から、ＰＷセンサ６３が光記録ディスク１１の外周縁を検出するまで、搬送駆動ローラ５３を回転させてディスクトレイ２を副走査方向Ｙに搬送する（ステップＳ２）。これによって、光記録ディスク１１の有無、及びおおよその位置を検出することができる。
【００５０】
つづいて、その状態から光記録ディスク１１を所定の搬送量ｄだけ、さらに副走査方向Ｙへ搬送する（ステップＳ３）。つまり、光記録ディスク１１を副走査方向Ｙへ搬送することによって、図５の符号ＳＣ１で示した方向に光記録ディスク１１を走査することになる。つづいて、ＰＷセンサ６３にて光記録ディスク１１の外周縁を検出するまでキャリッジ６１を一主走査方向（左方向）に移動させ（ステップＳ４）、つまり、図５の符号ＳＣ２で示した方向に光記録ディスク１１を走査し、検出した外周縁の位置を外周縁ＬＥとする（ステップＳ５）。そして、ＰＷセンサ６３が外周縁ＬＥを検出している状態から、ＰＷセンサ６３にて光記録ディスク１１の外周縁を検出するまでキャリッジ６１を他主走査方向（右方向）へ移動させ（ステップＳ６）、つまり、図５の符号ＳＣ３で示した方向に光記録ディスク１１を走査し、検出した外周縁の位置を外周縁ＲＥとする（ステップＳ７）。
【００５１】
ここで、搬送量ｄは、光記録ディスク１１のステップＳ２で検出した外周縁と中心孔１２との間にＰＷセンサ６３の検出点が位置するような搬送量に設定されている。したがって、ステップＳ４及びステップＳ６にて光記録ディスク１１を主走査方向に走査する際に中心孔１２上を走査しないので、ＰＷセンサ６３が中心孔１２の内周縁を光記録ディスク１１の外周縁として誤検出してしまうことを防止することができる。さらに、搬送量ｄは、光記録ディスク１１が排出従動ローラ５６に接する位置まで到達しない搬送量となっているので、光記録ディスク１１の中心点を検出する際に、排出従動ローラ５６の鋭角的に尖っている歯によって光記録ディスク１１のラベル面に傷が付いてしまうことを防止することができる。
【００５２】
つづいて、ＰＷセンサ６３の検出点を図５の符号ＳＣ４の矢印で示した方向に移動させて外周縁ＬＥと外周縁ＲＥの中間点まで移動させ（ステップＳ８）、そのＰＷセンサ６３の検出点の位置を中間点ＳＰとする（ステップＳ９）。つづいて、その状態から、ＰＷセンサ６３にて光記録ディスク１１の外周縁を検出するまで、光記録ディスク１１を副走査方向Ｙと逆の方向へ搬送し（ステップＳ１０）、つまり、図５の符号ＳＣ５で示した方向に光記録ディスク１１を走査し、検出した外周縁の位置を外周縁ＴＥとする（ステップＳ１１）。外周縁ＬＥと外周縁ＲＥとは、同じ主走査線上に位置しているので、この中間点ＳＰは、光記録ディスク１１の中心点ＣＰを通る副走査方向Ｙの中心軸線上に位置することになる。したがって、外周縁ＴＥは、副走査方向Ｙにおける光記録ディスク１１の最下流側の外周縁ということになる。
【００５３】
このようにして、外周縁ＬＥ、外周縁ＲＥ、及び外周縁ＴＥの位置を検出し、つづいて、この３カ所の外周縁の位置に基づいて光記録ディスク１１の中止点ＣＰの位置を演算して検出する手順について、図６、図７、及び図８を参照しながら説明する。図６は、光記録ディスク１１の中心点ＣＰの位置を検出する手順を示したフローチャートである。図７及び図８は、光記録ディスク１１の中心点ＣＰの位置を検出する工程を模式的に示した光記録ディスク１１の平面図である。
【００５４】
ここで、検出した外周縁ＬＥ、外周縁ＲＥ、外周縁ＴＥ、及び中間点ＳＰの位置を、検出時の主走査方向ＸにおけるＰＷセンサ６３の位置（キャリッジ６１の位置）、及び副走査方向Ｙにおける光記録ディスク１１の搬送位置に基づいて、基準点ＤＰを原点としたＸ−Ｙ座標に置き換える。そして、外周縁ＬＥ（又は外周縁ＲＥ）と中間点ＳＰと外周縁ＴＥとで形成される直角三角形を「第１の直角三角形」としての直角三角形Ａとする（図７参照）。
【００５５】
まず、直角三角形Ａの底辺Ａｘの長さを求める（ステップＳ２１）。底辺Ａｘは、図示の如くＸ軸上の外周縁ＬＥの位置から外周縁ＲＥの位置までの長さを１／２にした長さとなる。
【００５６】
Ａｘ＝（ＬＥ−ＲＥ）／２　　　…（１）
つづいて、直角三角形Ａの高さＡｙを求める（ステップＳ２２）。高さＡｙは、図示の如くＹ軸上の中間点ＳＰの位置から外周縁ＴＥの位置までの長さとなる。
【００５７】
Ａｙ＝ＳＰ−ＴＥ　　　…（２）
つづいて、式（１）で求めたＡｘと式（２）から求めたＡｙとから直角三角形Ａの斜辺Ｙｏの長さを求める（ステップＳ２３）。
【００５８】
Ａｏ＝√（Ａｘ^２＋Ａｙ^２）　　　…（３）
ここで、式（３）から求めたＹｏの中間点と外周縁ＴＥと中心点ＣＰとで形成される直角三角形を「第２の直角三角形」としての直角三角形Ｂとする（図８参照）。直角三角形Ａと直角三角形Ｂとは、高さＡｙと斜辺Ａｏとの間の角と、高さＢｙと斜辺Ｂｏとの間の角とが同じ角度となるので、相似の関係を有することになる。したがって、直角三角形Ａと直角三角形Ｂとの相似比を求めることによって、直角三角形Ａの斜辺Ａｏの長さから直角三角形Ｂの斜辺Ｂｏの長さを求めることができ、それによって、光記録ディスク１１の中心点ＣＰの位置を求めることができる。
【００５９】
つづいて、直角三角形Ｂの高さＢｙを求める（ステップＳ２４）。高さＢｙは、斜辺Ａｏの１／２の長さとなる。
【００６０】
Ｂｙ＝Ａｏ／２　　　…（４）
つづいて、直角三角形Ａの高さＡｙと直角三角形Ｂの高さＢｙとから、直角三角形Ａと直角三角形Ｂとの相似比を求め、その相似比から斜辺Ｂｏの長さを求める（ステップＳ２５）。
【００６１】
Ａｙ：Ｂｙ＝Ａｏ：Ｂｏ　　　…（５）
Ｂｏ＝（Ａｏ×Ｂｙ）／Ａｙ　　　…（６）
式（５）から式（６）を導き出すことができ、式（２）、式（３）、及び式（４）から求めた高さＡｙ、斜辺Ａｏ、及び高さＢｙを代入することによって、Ｂｏの長さを求めることができる。
【００６２】
そして、中心点ＣＰのＸ軸方向、及びＹ軸方向の位置を求めて、つまり、基準点ＤＰから中心点ＣＰまでの主走査方向Ｘの距離と、副走査方向Ｙの距離とを求めて光記録ディスク１１の中心点ＣＰの位置を求める。基準点ＤＰから中心点ＣＰまでの主走査方向Ｘの距離Ｘｏは、Ｘ軸方向の中間点ＳＰまでの距離なので、基準点ＤＰからＸ軸方向の外周縁ＲＥまでの距離に、外周縁ＬＥから外周縁ＲＥまでの長さの１／２の長さを加算することで求められる（ステップＳ２６）。
【００６３】
Ｘｏ＝ＳＰ＝ＲＥ＋（（ＬＥ−ＲＥ）／２）　　　…（７）
基準点ＤＰから中心点ＣＰまでの副走査方向Ｙの距離Ｙｏは、Ｙ軸方向の外周点ＴＥまでの距離に式（６）で求めたＢｏの長さを加算することで求められる（ステップＳ２７）。
【００６４】
Ｙｏ＝ＴＥ＋Ｂｏ　　　…（８）
このようにして、検出した３カ所の外周縁の位置に基づいて光記録ディスク１１の中心点ＣＰの位置を正確に検出することができる。また、ＰＷセンサ６３で光記録ディスク１１上を走査する距離を従来と比較して大幅に短くすることができるので、光記録ディスク１１の中心点ＣＰの位置検出に要する時間を大幅に短縮することができる。さらに、ＰＷセンサ６３にて光記録ディスク１１上を走査中に光記録ディスク１１のラベル面に排出従動ローラ５６が接する位置まで光記録ディスク１１を搬送することがないので、排出従動ローラ５６の尖った歯によって光記録ディスク１１のラベル面に傷が付くことを防止することができる。
【００６５】
尚、本願発明は上記実施例に限定されることなく、特許請求の範囲に記載した発明の範囲内で、種々の変形が可能であり、それらも本願発明の範囲内に含まれるものであることは言うまでもない。
【００６６】
【発明の効果】
本願発明によれば、印刷実行領域を設定するための光記録ディスクの位置検出を高精度で短時間に実行可能であり、かつ光記録ディスクの位置検出の際に光記録ディスクのラベル面を傷付けてしまう虞がより少ない印刷装置を提供することができる。
【図面の簡単な説明】
【図１】本願発明に係るインクジェット式印刷装置を示した斜視図である。
【図２】本願発明に係るインクジェット式印刷装置を示した要部平面図である。
【図３】本願発明に係るインクジェット式印刷装置を示した要部側面図である。
【図４】光記録ディスクの外周縁の位置を３カ所検出する手順を示したフローチャートである。
【図５】光記録ディスクの外周縁の位置を３カ所検出する工程を模式的に示した光記録ディスクの平面図である。
【図６】光記録ディスクの中心点の位置を検出する手順を示したフローチャートである。
【図７】光記録ディスクの中心点の位置を検出する工程を模式的に示した光記録ディスクの平面図であり、第１の直角三角形の斜辺を求める工程を示したものである。
【図８】光記録ディスクの中心点の位置を検出する工程を模式的に示した光記録ディスクの平面図であり、第２の直角三角形の斜辺を求める工程を示したものである。
【図９】従来技術における光記録ディスクの中心点の位置を検出する工程を模式的に示した光記録ディスクの平面図である。
【符号の説明】
２　　ディスクトレイ
３　　トレイアタッチメント
１１　光記録ディスク
１２　中心孔
２０　制御部
２１　凸部
２２　収納部
５０　印刷装置
５１　キャリッジガイド軸
５２　プラテン
５３　搬送駆動ローラ
５４　搬送従動ローラ
５５　排出駆動ローラ
５６　排出従動ローラ
６１　キャリッジ
６２　記録ヘッド
６３　ＰＷセンサ
Ｘ　　主走査方向
Ｙ　　副走査方向[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a printing apparatus having a so-called CD-R printing function for performing printing on a label surface of an optical recording disk such as a CD-R, and a print execution area when performing printing on a label surface of an optical recording disk. The present invention relates to a disc center point detection control program for detecting a center point of an optical recording disc, which is a reference for determining the center point.
[0002]
[Prior art]
An optical recording disk having a disk shape such as a CD-R can write information or the like printed on the optical recording disk on a predetermined surface of a side opposite to a printing surface, that is, a so-called label surface. A printing apparatus for printing on the label surface is disclosed in Japanese Patent Application Laid-Open No. H11-5332, and a printing method is disclosed in Japanese Patent No. 2794628. Further, International Publication No. WO97 / 11850 discloses a printing apparatus in which an optical recording disk is mounted on a disk tray, and the disk tray is conveyed to perform printing. In this method, the optical recording disk is mounted on a mounting portion consisting of a shallow circular groove formed in the center of the disk tray of the optical recording disk made of a rectangular thin plate, and the disk tray on which the optical recording disk is mounted is transported by transport rollers. Then, printing is performed on the label surface of the optical recording disk by the print head.
[0003]
However, in the printing apparatus and the printing method according to the related art, no means for detecting an accurate position of the optical recording disk on which printing is performed is disclosed, and the position of the optical recording disk deviates from the printing execution range. Even if printing occurs, printing is performed as it is, which causes problems such as misalignment of the printing position, the printing range protruding outside the printable area of the label surface of the optical recording disc, and contaminating the optical recording disc with ink. It is easy to occur.
[0004]
Therefore, as an example of a conventional technique for solving such a problem, Japanese Patent Application Laid-Open No. 2002-127530 discloses a technique in which a convex portion in which a center hole of an optical recording disk mounted on a disk tray is fitted is detected. A printing apparatus is disclosed in which a center position of an optical recording disk is calculated and calculated from a detected position of the convex portion, and a print execution range is determined based on the calculated center position of the optical recording disk. In addition, a technique is also known in which a mark or the like is provided on a disc tray and the position of the optical recording disc is calculated by detecting the mark position.
[0005]
However, since the position of the optical recording disk is indirectly detected by detecting a part of the disk tray on which the optical recording disk is mounted, or a mark attached to the disk tray, the optical recording A slight shift may occur in the printing position due to a shift in the mounting state of the recording disk or a detection error such as a mark, and it is not possible to always perform printing at a predetermined printing position on the optical recording disk with high accuracy. In addition, since it is not possible to detect the mounting state of the optical recording disk on the tray, there is a possibility that printing may be executed with the optical recording disk not mounted on the tray. For this reason, a technique for accurately detecting the position of the optical recording disk by means of directly detecting the optical recording disk has been known, and an optical recording disk arranged reciprocally in the main scanning direction on the optical recording disk is known. And a means for transporting the optical recording disk in the sub-scanning direction (a direction orthogonal to the main scanning direction) by using a sensor to detect the optical recording disk by scanning the optical recording disk with the sensor. . For example, as shown in FIG. 9, four points of the outer peripheral edge of the optical recording disk 11, namely, the front end TE, the rear end BE, the left end LE, and the right end RE are detected, and the optical recording disk 11 is detected from the detected positions of the four outer peripheral edges. Eleven center points CP are obtained, and a print execution area is set based on the center point CP and the position of each outer peripheral edge. In this way, since the optical recording disk 11 is directly detected and the print execution area is set, there is no possibility that a print shift on the label surface of the optical recording disk 11 occurs, and the printing on the label surface is always executed with high accuracy. Can be.
[0006]
[Problems to be solved by the invention]
However, as described above, when four points of the outer peripheral edge of the optical recording disk 11 are detected, that is, the front end TE, the rear end BE, the left end LE, and the right end RE, the scanning distance of the sensor is long, and the auxiliary A large amount of time is required for the transport operation in the scanning direction Y and the reciprocating operation of the sensor in the main scanning direction X, and the time required to execute printing on the label surface of one optical recording disk 11 is long. There was a problem of becoming. Further, since the scanning is performed on the center hole 12 formed at the center of the optical recording disk 11, the outer peripheral edge of the optical recording disk 11 and the inner peripheral edge of the central hole 12 are detected by the sensor. Therefore, it is necessary to perform a sensor masking process or the like for preventing the inner peripheral edge of the center hole 12 from being erroneously detected as the outer peripheral edge, and the detection procedure of the optical recording disk 11 is complicated.
[0007]
Further, if the label surface of the optical recording disk 11 is damaged, there is a possibility that the print data on the optical recording disk 11 cannot be read. Although it cannot normally occur, for example, when the optical recording disk 11 is conveyed by conveying means such as a conveying roller, small dust or the like adhering to the label surface is placed between the conveying roller and the label surface of the optical recording disk 11. The label surface may be scratched by the pinch. Therefore, when the optical recording disk 11 is scanned from the front end TE to the rear end BE of the optical recording disk 11 as shown in FIG. 9, the optical recording disk 11 is transported by the transporting means during that time. Not only when printing on the surface, but also when detecting the position of the optical recording disk 11, the label surface of the optical recording disk 11 may be damaged over the entire area from the front end TE to the rear end BE of the optical recording disk 11. It did, and it was never a good thing.
[0008]
The present invention has been made in view of such a situation, and a problem thereof is that the position of an optical recording disk for setting a print execution area can be detected with high accuracy in a short time, and optical recording is performed. It is an object of the present invention to provide a printing apparatus which is less likely to damage the label surface of an optical recording disk when detecting the position of the disk.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 of the present application provides an optical recording disk printing means for executing printing on a printing area set on a label surface of the optical recording disk based on a position of a center point of the optical recording disk. A disk outer periphery detecting means arranged so as to be able to scan on the optical recording disk in the main scanning direction and capable of detecting the outer peripheral edge of the optical recording disk; and a disk transport for transporting the optical recording disk in the sub scanning direction. Means for controlling a position of a center point of the optical recording disk by controlling the disk outer peripheral edge detecting means and the disk transporting means, the printing apparatus comprising: The center point detection control means detects three outer peripheral edges of the optical recording disk, and detects the position of the center point of the optical recording disk based on the detected three outer peripheral edge positions. To it is printing apparatus characterized by.
[0010]
Since the center point of the circle can be determined from the positions of three points on the circumference, the three outer peripheral edges of the optical recording disk are detected, and the center point of the optical recording disk is determined based on the detected three outer peripheral edge positions. Can be detected. Therefore, it is possible to reduce the amount of scanning by the detecting means such as a sensor for detecting the outer peripheral edge of the optical recording disk, as compared with the conventional method in which the outer peripheral edge of the optical recording disk is detected at the four front and rear ends and the right and left ends. Therefore, the detection time of the outer peripheral edge of the optical recording disk can be shortened, and the detection time of the center point of the optical recording disk can be shortened. Further, the amount of scanning by the detecting means such as a sensor for detecting the outer peripheral edge of the optical recording disk can be reduced, so that the amount of transportation by the disk transporting means is reduced, whereby the optical recording disk is transported by the disk transporting means. At the time of labeling, it is possible to reduce the possibility that the label surface is damaged.
[0011]
Thus, according to the printing apparatus of the first aspect of the present invention, the detection time of the center point of the optical recording disk can be shortened, and the label is transported when the optical recording disk is transported by the disk transport means. Since the possibility of scratching the surface can be reduced, the position detection of the optical recording disk for setting the print execution area can be performed with high accuracy in a short time, and when detecting the position of the optical recording disk, The operational effect is obtained that the possibility of damaging the label surface of the optical recording disk can be further reduced.
[0012]
According to a second aspect of the present invention, in the first aspect, the disk center point detection control means detects the outer peripheral edge of the optical recording disk on the downstream side in the sub-scanning direction by the disk outer peripheral edge detection means, and Optical recording disk detecting means for detecting the optical recording disk, and after detecting the outer peripheral edge of the optical recording disk by the optical recording disk detecting means, after transporting the optical recording disk by a predetermined transport amount and stopping, First outer edge detecting means for scanning the optical recording disk in the main scanning direction by the disk outer edge detecting means to detect both outer edges of the optical recording disk on a scanning line, respectively; After moving the detection point of the disk outer peripheral edge detecting means to an intermediate point between both outer peripheral edges of the optical recording disk detected by the peripheral edge detecting means, the optical recording disk is transported in a direction opposite to the sub-scanning direction. And second outer edge detecting means for detecting the outer peripheral edge of the optical recording disk on the downstream side in the sub-scanning direction by the outer peripheral edge detecting means of the optical recording disk, wherein two positions detected by the first outer edge detecting means are provided. A position of a center point of the optical recording disk is calculated from the position of the outer peripheral edge of the optical recording disk and the position of the outer peripheral edge detected by the second outer peripheral edge detecting means.
[0013]
First, the outer peripheral edge of the optical recording disk on the downstream side in the sub-scanning direction is detected by a disk outer peripheral edge detecting means capable of detecting the outer peripheral edge of the optical recording disk. The outer peripheral edge on the downstream side in the sub-scanning direction does not have to be the outermost peripheral edge on the most downstream side in the sub-scanning direction; As a result, first, the approximate position of the optical recording disk is detected, and three outer peripheral edges for detecting the center point of the optical recording disk starting from the detected outer peripheral edge are detected.
[0014]
Next, after transporting the optical recording disk by a predetermined transport amount and stopping the optical recording disk, the optical recording disk is scanned in the main scanning direction by the disk peripheral edge detecting means, and both outer peripheral edges of the optical recording disk on the scanning line are scanned. Detect each. Subsequently, after moving the detection point of the disk outer peripheral edge detecting means to an intermediate point between the outer peripheral edges thereof, the optical recording disk is conveyed in a direction opposite to the sub-scanning direction and is again downstream of the optical recording disk in the sub-scanning direction. The outer edge is detected. The midpoint between the two outer peripheral edges on the same main scanning line is on the central axis of the optical recording disk in the sub-scanning direction.
[0015]
Therefore, after the detection point of the disk outer peripheral edge detecting means is moved to the intermediate point, the outer peripheral edge of the optical recording disk detected by transporting the optical recording disk in the direction opposite to the sub-scanning direction is optically recorded in the sub-scanning direction. This is the outer peripheral edge located on the most downstream side of the disk. Since the remaining two outer peripheral edges are located on the same main scanning line with respect to the outer peripheral edge, the two outer peripheral edges have a positional relationship symmetrical with respect to the central axis of the optical recording disk in the sub-scanning direction. Become.
[0016]
Thus, according to the printing apparatus of the second aspect of the present invention, in addition to the operation and effect of the first aspect of the present invention, the three detected outer peripheral edges have the above-described positional relationship. Accordingly, an operation and effect that the calculation of the center point position of the optical recording disk can be facilitated is obtained.
[0017]
According to a third aspect of the present invention, in the second aspect, the first outer peripheral edge detecting means detects the outer peripheral edge of the optical recording disk, and thereafter the first outer peripheral edge detecting means mainly detects the optical recording disk by the disk outer peripheral edge detecting means. When scanning in the scanning direction, the optical recording disk is transported to a position where both outer peripheral edges of the optical recording disk can be detected without scanning the center hole of the optical recording disk. It is a printing device.
[0018]
As described above, when the optical recording disk is scanned in the main scanning direction by the disk outer peripheral edge detecting means, the center hole of the optical recording disk is not scanned, so that the inner peripheral edge of the central hole is erroneously detected as the outer peripheral edge. I will not do it. Therefore, according to the printing apparatus of the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, for example, the detection point of the disk outer periphery detecting means scans the vicinity of the center hole. This eliminates the need for a means of neglecting the disk edge detected during this operation as the inner peripheral edge of the center hole and ignoring it.
[0019]
According to a fourth aspect of the present invention, in the second aspect, the first outer peripheral edge detecting means mainly detects the outer peripheral edge of the optical recording disk, and thereafter, the first outer peripheral edge detecting means detects the outer peripheral edge of the optical recording disk. When scanning in the scanning direction, transport the optical recording disk to a position that can be scanned between the outer peripheral edge of the optical recording disk and the center hole of the optical recording disk detected by the optical recording disk detection means, A printing apparatus characterized in that:
[0020]
According to the printing apparatus of the fourth aspect of the present invention, in addition to the effect of the second aspect of the present invention, when the optical recording disk is scanned in the main scanning direction by the disk outer peripheral edge detecting means. By scanning between the outer peripheral edge of the optical recording disk detected by the optical recording disk detecting means and the center hole of the optical recording disk and not scanning the center hole of the optical recording disk, It is possible to prevent the erroneous detection of the peripheral edge as the outer peripheral edge, and it is possible to obtain the operational effect that the transport amount of the optical recording disk can be reduced.
[0021]
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the disk center point detection control means sets the detected outer peripheral edges of the three optical recording disks at points A and B. , And C, and calculates the position of the intersection of the vertical bisector of the line connecting points A and C and the vertical bisector of the line connecting points B and C. A printing device for detecting a position of a center point of the optical recording disk.
[0022]
Assuming that three points on the same circumference are point A, point B, and point C, a perpendicular bisector of a line connecting point A and point C, and a line segment connecting point B and point C The intersection with the vertical bisector of is the center point of the circle. Therefore, according to the printing apparatus of the fifth aspect of the present invention, the detected outer peripheral edges of the three optical recording disks are point A, point B, and point C, and point A and point C are connected. The center point of the optical recording disk can be calculated by calculating the position of the intersection of the vertical bisector of the elliptical line and the vertical bisector of the line connecting points B and C. .
[0023]
According to a sixth aspect of the present invention, in any one of the second to fourth aspects, the disk center point detection control means is configured to detect both outer edges of the optical recording disk detected by the first outer edge detection means. Are point A and point B, the outer peripheral edge of the optical recording disk detected by the second outer peripheral edge detecting means is point C, an intermediate point between point A and point B is point D, and point A is A point E is defined as an intermediate point between the points A and C, and a first right triangle formed by similar points A, C, and D, and points C, E, and the center of the optical recording disk. Multiplying the similarity ratio with the second right triangle formed by the length between points A and C to obtain the length from point C to the center point of the optical recording disk, A printing apparatus for detecting a position of a center point of an optical recording disk.
[0024]
First, the outer peripheral edges of the optical recording disk detected by the first outer peripheral edge detecting means are defined as points A and B, and the outer peripheral edge of the optical recording disk detected by the second outer peripheral edge detecting means is defined as point C. Further, an intermediate point between points A and B is defined as point D, and an intermediate point between points A and C is defined as point E. Then, a first right triangle formed by points A, C, and D and a second right triangle formed by points C, E, and the center point of the optical recording disk have similar right angles. It becomes a triangle. Accordingly, the similarity ratio is obtained, and the length of the side connecting the points A and C of the first right triangle corresponding to the side connecting the point C of the second right triangle and the center point of the optical recording disk is calculated. By multiplying the distance by the similarity ratio, the length of the side connecting the point C of the second right triangle and the center point of the optical recording disk can be obtained, whereby the position of the center point of the optical recording disk can be obtained. Can be requested.
[0025]
The invention according to claim 7 of the present application is a label surface printing means for executing printing on a print area set on the label surface of the optical recording disk based on the position of the center point of the optical recording disk, and In a printing apparatus provided with a disk outer periphery detecting means arranged so as to be capable of scanning in the main scanning direction and capable of detecting the outer peripheral edge of the optical recording disk, and a disk transport means for transporting the optical recording disk in the sub-scanning direction. A disc center point detection control program for causing a computer to execute control for detecting the position of the center point of the optical recording disc by controlling the disc outer periphery detecting means and the disc transport means; A procedure for detecting three peripheral edges of the recording disk, and a method for detecting the position of the center point of the optical recording disk based on the detected three peripheral edges. With the door, it is a disc center point detection control program characterized.
[0026]
According to the disk center point detection control program according to the invention of claim 7 of the present application, the same operation and effect as the above-described invention of claim 1 can be obtained, and this disk center point detection control program can be used. The same operation and effect as the above-described invention according to claim 1 of the present invention can be provided to any printing device that can be executed.
[0027]
The optical recording disk according to claim 8, wherein the optical recording disk is detected by detecting the outer peripheral edge of the optical recording disk on the downstream side in the sub-scanning direction by the disk outer peripheral detecting means. After detecting the outer peripheral edge of the optical recording disk in the detecting step and the optical recording disk detecting step, transporting the optical recording disk by a predetermined transport amount and stopping the optical recording disk, the disk outer peripheral edge detecting means A first outer edge detecting step of scanning the optical recording disk in the main scanning direction to detect both outer edges of the optical recording disk on a scanning line, and the light detected by the first outer edge detecting step; After moving the detection point of the disk outer peripheral edge detecting means to an intermediate point between both outer peripheral edges of the recording disk, the optical recording disk is transported in a direction opposite to the sub-scanning direction, and is again moved in the sub-scanning direction of the optical recording disk. A second outer peripheral edge detecting procedure for detecting the outer peripheral edge on the upstream side by the disk outer peripheral edge detecting means; two outer peripheral edge positions detected by the first outer peripheral edge detecting procedure; Calculating the position of the center point of the optical recording disk from the position of the outer edge detected by the outer edge detection procedure.
[0028]
According to the disk center point detection control program according to the invention of claim 8 of the present application, the same operation and effect as the above-described invention of claim 2 can be obtained, and this disk center point detection control program can be used. The same operation and effect as the above-described invention of claim 2 can be provided to any printing device that can be executed.
[0029]
According to a ninth aspect of the present invention, in the ninth aspect, the first outer edge detecting step comprises detecting the outer edge of the optical recording disk, and then detecting the outer edge of the optical recording disk by the disk outer edge detecting means. When scanning in the scanning direction, the optical recording disk is transported to a position where both outer peripheral edges of the optical recording disk can be detected without scanning the center hole of the optical recording disk. This is a disk center point detection control program.
[0030]
According to the disk center point detection control program according to the ninth aspect of the present invention, the same operation and effect as the above-described invention of the third aspect can be obtained, and the disk center point detection control program can be used. The same operation and effect as the above-described invention according to claim 3 of the present invention can be provided to any printing device that can be executed.
[0031]
According to a tenth aspect of the present invention, in the eighth aspect, in the first outer edge detecting step, after detecting the outer edge of the optical recording disk, the disk outer edge detecting means mainly detects the outer edge of the optical recording disk. When scanning in the scanning direction, transport the optical recording disk to a position that can be scanned between the outer peripheral edge of the optical recording disk and the center hole of the optical recording disk detected in the optical recording disk detection procedure, A disk center point detection control program characterized in that:
[0032]
According to the disk center point detection control program according to the tenth aspect of the present invention, the same operation and effect as the above-described invention of the fourth aspect can be obtained, and the disk center point detection control program can be used. The same operation and effect as the above-described invention according to claim 4 of the present invention can be provided to any printing device that can be executed.
[0033]
The invention according to claim 11 of the present application is the invention according to any one of claims 7 to 10, wherein the detected outer peripheral edges of the three optical recording disks are point A, point B, and point C; By calculating the position of the intersection of the perpendicular bisector of the line connecting point C and the perpendicular bisector of the line connecting point B and point C, the center point of the optical recording disk is calculated. And a disk center point detection control program having a procedure for detecting the position of a disk.
[0034]
According to the disk center point detection control program according to the invention of claim 11 of the present application, it is possible to obtain the same operation and effect as the above-described invention of claim 5 of the present invention, and to execute the disk center point detection control program. The same operation and effect as the above-described invention of claim 5 can be provided to any printing device that can be executed.
[0035]
According to a twelfth aspect of the present invention, in accordance with any one of the eighth to tenth aspects, both outer peripheral edges of the optical recording disk detected by the first outer peripheral edge detecting means are point A and point B, The outer peripheral edge of the optical recording disk detected by the second outer peripheral edge detecting means is defined as point C, the intermediate point between points A and B is defined as point D, and the intermediate point between points A and C is defined as Is the point E, and the similarity ratio between the right triangle formed by the similar points A, C, and D, and the right triangle formed by the points C, E, and the center point of the optical recording disk, Detecting the position of the center point of the optical recording disk by multiplying the length between the point A and the point C to obtain a length from the point C to the center point of the optical recording disk, A disk center point detection control program characterized in that:
[0036]
According to the disk center point detection control program according to the twelfth aspect of the present invention, it is possible to obtain the same operation and effect as the above-described invention of the sixth aspect, and to execute the disk center point detection control program. The same operation and effect as the above-described invention according to claim 6 can be provided to any printing device that can be executed.
[0037]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing an ink jet printing apparatus according to the present invention.
[0038]
The ink jet printing apparatus 50 includes a main body 5 having a paper feed button 7 and a paper discharge unit 6 formed on the front side of the main body 5. Note that the ink jet printing apparatus 50 is usually for printing on paper, and a feed tray for stocking paper can be attached to the rear side of the main body 5 when paper is used as a printing material. It has become. A disk tray receiving portion 32 is formed on the front side of the main body 5, and the tray attachment 3 can be mounted on the disk tray receiving portion 32 from the front side. The tray attachment 3 is made of a flat black plastic that is supported slidably in the front-rear direction along a tray support 31 provided on both left and right sides and a guide formed inside the tray support 31. And a disk tray 2. On the disc tray 2, a storage section 22 for an optical recording disc 11 to be printed, such as a CD-R, is formed, and in the center thereof, a convex portion having the same diameter as a hole formed in the center of the optical recording disc 11 is formed. A part 21 is formed. The projection 21 is formed so that the optical recording disk 11 can be arranged concentrically with respect to the storage portion 22 in a state where the center hole 12 of the optical recording disk 11 is fitted.
[0039]
FIG. 2 is a plan view of a main part showing the ink jet printing apparatus 50 according to the present invention. FIG. 3 is a side view of the main part.
[0040]
The inkjet printing apparatus 50 is provided with a carriage 61 which is supported by a carriage guide shaft 51 and moves in the main scanning direction X according to a control signal from the control unit 20. A platen 52 is provided to face the carriage 61. A recording head 62 is mounted on the carriage 61 as a “label surface printing unit” that performs printing by discharging ink onto a label surface of the optical recording disk 11 mounted on the disk tray 2 as a printing material. Is transported in the main scanning direction X, and while the optical recording disk 11 mounted on the disk tray 2 is transported in the sub-scanning direction Y between the carriage 61 and the platen 52, the recording head 62 is moved to the label surface of the optical recording disk 11. By discharging the ink, printing is performed on the label surface of the optical recording disk 11. Further, a PW sensor 63 capable of detecting the outer periphery of the optical recording disk 11 is mounted on the carriage 61 as “disk outer periphery detecting means” for detecting the outer periphery of the optical recording disk 11. The PW sensor 63 also functions as a sensor that detects the width of the printing paper when printing is performed on printing paper such as plain paper.
[0041]
Further, the inkjet printing apparatus 50 is provided with a transport drive roller 53 and a transport driven roller 54 as “disk transport means” for transporting the disk tray 2 on which the optical recording disk 11 is mounted as a printing material in the sub-scanning direction Y. Have been. The rotation of the transport driving roller 53 is controlled by a rotation driving force of a stepping motor or the like based on a control signal from the control unit 20, and the disc tray 2 is transported in the sub-scanning direction Y by the rotation of the transport driving roller 53. A plurality of transport driven rollers 54 are provided, each of which is individually urged by the transport drive roller 53, and when the disk tray 2 is transported by the rotation of the transport drive roller 53, the transport driven roller 54 comes into contact with the disk tray 2 and It rotates following the conveyance. Note that the recording head 62 as a “label surface printing unit” is a unit that prints not only the label surface of the recording disk 11 but also printing paper such as plain paper as a material to be printed. Needless to say, it is a means for conveying not only the tray 2 but also printing paper such as plain paper as a printing material.
[0042]
On the other hand, a discharge drive roller 55 and a discharge driven roller are used as discharge means of a printed material for discharging the printing paper such as plain paper after printing or the disc tray 2 after printing on the label surface of the optical recording disk 11. 56 are provided. The rotation of the discharge drive roller 55 is controlled by a rotation driving force of a stepping motor or the like, and the printing material is discharged in the sub-scanning direction Y by the rotation of the discharge drive roller 55. A plurality of discharge driven rollers 56 are provided, have a plurality of teeth around them, and are toothed rollers that are sharply pointed so that the tips of the teeth are in point contact with the printing surface of the printing material. When the printing material is discharged by the rotation of the discharge driving roller 55, the printing is performed in a state where the printing material is in contact with the printing surface. It rotates following the discharge of material.
[0043]
When the tray attachment 3 is inserted, the disc tray receiving section 32 holds the flat disc tray 2 between the discharge drive roller 55 and the discharge driven roller 56 and between the transport drive roller 53 and the transport driven roller 54. Thus, the disc tray 2 can move in the front-rear direction of the ink jet printing apparatus 50 between the tray supports 31 by receiving the driving force of the transport driving roller 53 and the discharge driving roller 55. Has become.
[0044]
Further, the control unit 20 controls the carriage 61 on which the PW sensor 63 as the “disk outer periphery detecting means” described above is mounted and the transport driving roller 53 as the “disk transporting means”. The optical recording disk 11 is scanned in the main scanning direction X and the sub-scanning direction Y to detect the position of the center point of the optical recording disk 11 based on the detection position of the outer peripheral edge of the optical recording disk 11 detected by the PW sensor 63. "Disc center point detection control means".
[0045]
Next, in order to print on the label surface of the optical recording disk 11 mounted on the disk tray 2, a procedure for mounting the disk tray 2 on the ink jet printing apparatus 50, and the optical disk mounted on the disk tray 2 after mounting. The procedure for detecting the position of the center point of the recording disk 11 will be described.
[0046]
First, a procedure for mounting the disc tray 2 on the ink jet printing apparatus 50 will be briefly described. First, the tray support 31 of the tray attachment 3 is pushed into the main body 5 from the disc tray receiving portion 32 and mounted. At this time, the transport driven roller 54 and the discharge driven roller 56 are set in a release state by release means (not shown). Next, the disk tray 2 on which the optical recording disk 11 is mounted is pushed completely into the main body 5 with the label surface facing upward. Then, the release state of the transport driven roller 54 and the discharge driven roller 56 is released, so that the disk tray 2 can be transported and discharged.
[0047]
Next, a procedure for detecting the position of the center point of the optical recording disk 11 mounted on the disk tray 2 will be described with reference to FIGS. FIG. 4 is a flowchart showing a procedure for detecting three positions of the outer peripheral edge of the optical recording disk 11. FIG. 5 is a plan view of the optical recording disk 11 schematically showing a process of detecting three positions of the outer peripheral edge of the optical recording disk 11.
[0048]
The PW sensor 63 reciprocates in the main scanning direction X by reciprocating the carriage 61 in the main scanning direction X under the control of the control unit 20, whereby the optical recording disk 11 is moved by the PW sensor 63 in the main scanning direction. X can be scanned. Also, under the control of the control unit 20, the disc tray 2 moves in the sub-scanning direction Y or in the direction opposite to the sub-scanning direction Y by the forward or reverse rotation of the transport driven roller 54, whereby the PW sensor 63 Thus, the optical recording disk 11 can be scanned in the sub-scanning direction Y or in a direction opposite to the sub-scanning direction Y.
[0049]
First, when the paper feed button 7 is pressed while the disc tray 2 is mounted on the ink jet printing apparatus 50, the carriage 61 moves from the home position to the detection point of the PW sensor 63 on the center axis of the optical recording disc 11 in the sub-scanning direction Y. It moves until it is located near (step S1). From this state, the transport drive roller 53 is rotated to transport the disk tray 2 in the sub-scanning direction Y until the PW sensor 63 detects the outer peripheral edge of the optical recording disk 11 (step S2). This makes it possible to detect the presence or absence of the optical recording disk 11 and the approximate position.
[0050]
Subsequently, from this state, the optical recording disk 11 is further transported in the sub-scanning direction Y by a predetermined transport amount d (step S3). That is, by transporting the optical recording disk 11 in the sub-scanning direction Y, the optical recording disk 11 is scanned in the direction indicated by reference numeral SC1 in FIG. Subsequently, the carriage 61 is moved in one main scanning direction (left direction) until the outer peripheral edge of the optical recording disk 11 is detected by the PW sensor 63 (step S4), that is, in the direction indicated by reference numeral SC2 in FIG. The optical recording disk 11 is scanned, and the position of the detected outer peripheral edge is set as the outer peripheral edge LE (step S5). Then, the carriage 61 is moved in the other main scanning direction (right direction) from the state where the PW sensor 63 detects the outer peripheral edge LE until the PW sensor 63 detects the outer peripheral edge of the optical recording disk 11 (step S6). That is, the optical recording disk 11 is scanned in the direction indicated by the reference numeral SC3 in FIG. 5, and the detected outer peripheral edge position is set as the outer peripheral edge RE (step S7).
[0051]
Here, the carry amount d is set such that the detection point of the PW sensor 63 is located between the outer peripheral edge of the optical recording disk 11 detected in step S2 and the center hole 12. Therefore, when the optical recording disk 11 is scanned in the main scanning direction in steps S4 and S6, the center hole 12 is not scanned, so that the PW sensor 63 uses the inner peripheral edge of the central hole 12 as the outer peripheral edge of the optical recording disk 11. It is possible to prevent erroneous detection. Further, the transport amount d is a transport amount that does not reach the position where the optical recording disk 11 comes into contact with the discharge driven roller 56. Therefore, when the center point of the optical recording disk 11 is detected, It is possible to prevent the label surface of the optical recording disk 11 from being damaged by the sharp teeth.
[0052]
Subsequently, the detection point of the PW sensor 63 is moved in the direction indicated by the arrow SC4 in FIG. 5 to the intermediate point between the outer edge LE and the outer edge RE (step S8), and the detection point of the PW sensor 63 is moved. Is set as the intermediate point SP (step S9). Subsequently, from this state, the optical recording disk 11 is transported in the direction opposite to the sub-scanning direction Y until the outer peripheral edge of the optical recording disk 11 is detected by the PW sensor 63 (step S10). The optical recording disk 11 is scanned in the direction indicated by the symbol SC5, and the position of the detected outer peripheral edge is set as the outer peripheral edge TE (step S11). Since the outer edge LE and the outer edge RE are located on the same main scanning line, the intermediate point SP is located on the center axis in the sub-scanning direction Y passing through the center point CP of the optical recording disk 11. Become. Therefore, the outer peripheral edge TE is the outermost peripheral edge of the optical recording disk 11 in the sub-scanning direction Y.
[0053]
In this way, the positions of the outer edge LE, the outer edge RE, and the outer edge TE are detected, and then the position of the stop point CP of the optical recording disk 11 is calculated based on the three outer edge positions. The detection procedure will be described with reference to FIGS. 6, 7, and 8. FIG. FIG. 6 is a flowchart showing a procedure for detecting the position of the center point CP of the optical recording disk 11. FIGS. 7 and 8 are plan views of the optical recording disk 11 schematically showing a process of detecting the position of the center point CP of the optical recording disk 11.
[0054]
The positions of the detected outer edge LE, outer edge RE, outer edge TE, and intermediate point SP are determined by detecting the position of the PW sensor 63 in the main scanning direction X (the position of the carriage 61) and the sub-scanning direction Y. Is replaced with the XY coordinates with the reference point DP as the origin. Then, a right triangle formed by the outer edge LE (or the outer edge RE), the intermediate point SP, and the outer edge TE is referred to as a right triangle A as a “first right triangle” (see FIG. 7).
[0055]
First, the length of the base Ax of the right triangle A is determined (step S21). The bottom side Ax has a length obtained by halving the length from the position of the outer peripheral edge LE on the X axis to the position of the outer peripheral edge RE on the X axis as shown in the figure.
[0056]
Ax = (LE-RE) / 2 (1)
Subsequently, the height Ay of the right triangle A is obtained (step S22). The height Ay is a length from the position of the intermediate point SP on the Y axis to the position of the outer peripheral edge TE as shown in the figure.
[0057]
Ay = SP-TE (2)
Subsequently, the length of the hypotenuse Yo of the right triangle A is calculated from Ax obtained by the expression (1) and Ay obtained from the expression (2) (step S23).
[0058]
Ao = √ (Ax ² + Ay ² …… (3)
Here, a right triangle formed by the intermediate point of Yo, the outer peripheral edge TE, and the center point CP obtained from Expression (3) is defined as a right triangle B as a “second right triangle” (see FIG. 8). The right triangle A and the right triangle B have a similar relationship because the angle between the height Ay and the hypotenuse Ao is the same as the angle between the height By and the hypotenuse Bo. . Therefore, the length of the hypotenuse Bo of the right triangle B can be obtained from the length of the hypotenuse Ao of the right triangle A by calculating the similarity ratio between the right triangle A and the right triangle B. Of the center point CP can be obtained.
[0059]
Subsequently, the height By of the right triangle B is obtained (step S24). The height By is half the length of the hypotenuse Ao.
[0060]
By = Ao / 2 (4)
Subsequently, the similarity ratio between the right triangle A and the right triangle B is obtained from the height Ay of the right triangle A and the height By of the right triangle B, and the length of the hypotenuse Bo is obtained from the similarity ratio (step S25). .
[0061]
Ay: By = Ao: Bo (5)
Bo = (Ao × By) / Ay (6)
Expression (6) can be derived from Expression (5), and by substituting the height Ay, the hypotenuse Ao, and the height By obtained from Expressions (2), (3), and (4), The length of Bo can be determined.
[0062]
Then, the position of the center point CP in the X-axis direction and the Y-axis direction is obtained, that is, the distance in the main scanning direction X from the reference point DP to the center point CP and the distance in the sub-scanning direction Y are obtained. The position of the center point CP of the recording disk 11 is obtained. Since the distance Xo in the main scanning direction X from the reference point DP to the center point CP is the distance from the reference point DP to the outer peripheral edge RE in the X-axis direction, the distance Xo from the outer peripheral edge LE to the distance from the reference point DP to the outer peripheral edge RE in the X-axis direction. It is obtained by adding a half of the length to the outer peripheral edge RE (step S26).
[0063]
Xo = SP = RE + ((LE−RE) / 2) (7)
The distance Yo in the sub-scanning direction Y from the reference point DP to the center point CP is obtained by adding the length of Bo obtained by Expression (6) to the distance from the outer peripheral point TE in the Y-axis direction (step S27). ).
[0064]
Yo = TE + Bo (8)
In this manner, the position of the center point CP of the optical recording disk 11 can be accurately detected based on the three detected outer peripheral edge positions. Further, since the distance over which the optical recording disk 11 is scanned by the PW sensor 63 can be significantly reduced as compared with the related art, the time required for detecting the position of the center point CP of the optical recording disk 11 can be significantly reduced. Can be. Further, since the optical recording disk 11 is not conveyed to a position where the output driven roller 56 contacts the label surface of the optical recording disk 11 while the optical recording disk 11 is being scanned by the PW sensor 63, the output driven roller 56 It is possible to prevent the label surface of the optical recording disk 11 from being damaged by the bent teeth.
[0065]
The invention of the present application is not limited to the above embodiments, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the invention of the present application. Needless to say.
[0066]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the position detection of an optical recording disk for setting a print execution area can be performed with high precision in a short time, and the label surface of the optical recording disk is damaged when the position of the optical recording disk is detected. It is possible to provide a printing apparatus that is less likely to be damaged.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an ink jet printing apparatus according to the present invention.
FIG. 2 is a main part plan view showing the ink jet printing apparatus according to the present invention.
FIG. 3 is a main part side view showing the ink jet printing apparatus according to the present invention.
FIG. 4 is a flowchart showing a procedure for detecting three positions of the outer peripheral edge of the optical recording disk.
FIG. 5 is a plan view of the optical recording disk schematically showing a process of detecting three positions of the outer peripheral edge of the optical recording disk.
FIG. 6 is a flowchart showing a procedure for detecting the position of the center point of the optical recording disk.
FIG. 7 is a plan view of the optical recording disc schematically showing a step of detecting the position of the center point of the optical recording disc, and shows a step of obtaining a hypotenuse of a first right triangle.
FIG. 8 is a plan view of the optical recording disc schematically showing a step of detecting a position of a center point of the optical recording disc, and shows a step of obtaining a hypotenuse of a second right triangle.
FIG. 9 is a plan view of an optical recording disk schematically showing a process of detecting a position of a center point of the optical recording disk in the related art.
[Explanation of symbols]
2 Disc tray
3 tray attachment
11 Optical recording disk
12 center hole
20 control unit
21 convex part
22 storage section
50 Printer
51 Carriage guide shaft
52 Platen
53 Transport drive roller
54 Conveyance driven roller
55 discharge drive roller
56 Discharge driven roller
61 carriage
62 recording head
63 PW sensor
X main scanning direction
Y Sub scanning direction

Claims

Optical recording disk printing means for performing printing on a printing area set on the label surface of the optical recording disk based on the position of the center point of the optical recording disk, and disposed so as to be capable of scanning on the optical recording disk in the main scanning direction. The disk outer peripheral edge detecting means capable of detecting the outer peripheral edge of the optical recording disk,
Disk transport means for transporting the optical recording disk in the sub-scanning direction,
A printing apparatus comprising: a disk center detection unit that controls the disk outer periphery detection unit and the disk conveyance unit to detect a position of a center point of the optical recording disk,
The disk center point detection control means detects three peripheral edges of the optical recording disk, and detects the position of the central point of the optical recording disk based on the detected three peripheral edge positions. Printing equipment.

2. The optical recording disk detection device according to claim 1, wherein the disk center point detection control means detects the optical recording disk by detecting the outer peripheral edge of the optical recording disk on the downstream side in the sub-scanning direction by the disk outer peripheral edge detecting means. Means,
After detecting the outer peripheral edge of the optical recording disk by the optical recording disk detecting means, transporting the optical recording disk by a predetermined transport amount and stopping the optical recording disk, the optical recording disk is detected by the disk outer peripheral edge detecting means. First outer edge detecting means for scanning in the main scanning direction to detect both outer edges of the optical recording disk on a scanning line, respectively;
After moving the detection point of the disk outer peripheral edge detecting means to an intermediate point between the outer peripheral edges of the optical recording disk detected by the first outer peripheral edge detecting means, the optical recording disk is moved in a direction opposite to the sub-scanning direction. Second outer edge detecting means for transporting the optical recording disk in the same direction and detecting the outer peripheral edge of the optical recording disk on the downstream side in the sub-scanning direction with the disk outer edge detecting means again;
Calculating the position of the center point of the optical recording disk from the positions of the two outer edges detected by the first outer edge detecting means and the outer edges detected by the second outer edge detecting means; A printing device, characterized in that:

3. The optical disk according to claim 2, wherein the first outer edge detecting unit detects the outer edge of the optical recording disk, and then scans the optical recording disk in the main scanning direction by the outer edge detecting unit. A printing apparatus, wherein the optical recording disk is transported to a position where both outer peripheral edges of the optical recording disk can be detected without scanning a center hole of the recording disk.

3. The optical disc according to claim 2, wherein the first outer peripheral edge detecting means detects the outer peripheral edge of the optical recording disk, and then scans the optical recording disk in the main scanning direction by the disk outer peripheral edge detecting means. A printing apparatus, comprising: transporting the optical recording disk to a position where the optical recording disk can be scanned between an outer peripheral edge of the optical recording disk detected by a recording disk detection unit and a center hole of the optical recording disk.

5. The disk center point detection control means according to claim 1, wherein the detected outer peripheral edges of the three optical recording disks are point A, point B, and point C, and the points A and C By calculating the position of the intersection of the vertical bisector of the line connecting the points and the vertical bisector of the line connecting points B and C, the center point of the optical recording disk is calculated. A printing device for detecting a position.

5. The disk center point detection control unit according to claim 2, wherein the outer peripheral edges of the optical recording disk detected by the first outer peripheral edge detection unit are point A and point B; The outer peripheral edge of the optical recording disk detected by the second outer peripheral edge detecting means is defined as point C, the intermediate point between points A and B is defined as point D, and the intermediate point between points A and C is defined as A first right triangle formed by similar points A, C and D, and a second right triangle formed by points C, E and the center of the optical recording disk. The distance between the point C and the center point of the optical recording disk is obtained by multiplying the similarity ratio by the length between the points A and C to detect the position of the center point of the optical recording disk. A printing device.

A label surface printing means for performing printing on a print area set on the label surface of the optical recording disk based on the position of the center point of the optical recording disk, and arranged so as to be able to scan on the optical recording disk in the main scanning direction. A printing apparatus comprising: a disk outer peripheral edge detecting unit capable of detecting an outer peripheral edge of the optical recording disk; and a disk transport unit that transports the optical recording disk in a sub-scanning direction, wherein the disk outer peripheral edge detecting unit; A disc center point detection control program for causing a computer to execute control to detect a position of a center point of the optical recording disc by controlling a disc transport means,
Detecting the outer peripheral edge of the optical recording disk at three places;
Detecting the position of the center point of the optical recording disk based on the detected three outer peripheral edge positions.

8. The optical recording disk detection procedure according to claim 7, wherein the disk outer peripheral edge detecting means detects an outer peripheral edge of the optical recording disk on a downstream side in a sub-scanning direction to detect the optical recording disk.
After detecting the outer peripheral edge of the optical recording disk in the optical recording disk detection procedure, the optical recording disk is transported by a predetermined transport amount and stopped, and then the optical recording disk is detected by the disk outer peripheral detecting means. A first outer edge detection procedure for scanning in the main scanning direction to detect both outer edges of the optical recording disk on a scanning line, respectively;
After moving the detection point of the disk outer peripheral edge detecting means to an intermediate point between the outer peripheral edges of the optical recording disk detected in the first outer peripheral edge detection procedure, the optical recording disk is moved in the opposite direction to the sub-scanning direction. The outer peripheral edge of the optical recording disk is detected again by the second outer peripheral edge detecting step of detecting the outer peripheral edge of the optical recording disk on the downstream side in the sub-scanning direction by the disk outer peripheral edge detecting means and the first outer peripheral edge detecting step. A step of calculating a position of a center point of the optical recording disk from two outer edge positions and an outer edge position detected by the second outer edge detection procedure. Point detection control program.

9. The optical disk according to claim 8, wherein the first outer edge detecting step comprises detecting the outer edge of the optical recording disk, and then scanning the optical recording disk in the main scanning direction by the outer edge detecting means. A disk center point detection control program for transporting the optical recording disk to a position where both outer peripheral edges of the optical recording disk can be detected without scanning a center hole of the recording disk.

9. The optical disk according to claim 8, wherein the first outer edge detecting step comprises detecting the outer edge of the optical recording disk, and then scanning the optical recording disk in the main scanning direction by the outer edge detecting means. Disc center point detection control, wherein the optical disc is transported to a position where it can be scanned between the outer peripheral edge of the optical recording disc and the center hole of the optical recording disc detected in the recording disc detection procedure. program.

11. The optical disc according to claim 7, wherein the detected outer peripheral edges of the three optical recording disks are point A, point B, and point C, and a line segment connecting point A and point C is perpendicular to the line. Having a procedure of detecting the position of the center point of the optical recording disc by calculating the position of the intersection of the bisector and the perpendicular bisector of the line connecting the points B and C; A disk center point detection control program characterized by the following.

11. The optical disk according to claim 8, wherein both outer edges detected by the first outer edge detecting unit are point A and point B, and the outer edge is detected by the second outer edge detecting unit. The outer peripheral edge of the optical recording disk is point C, an intermediate point between points A and B is point D, an intermediate point between points A and C is point E, and points A and A are similar. The similarity ratio between the right triangle formed by points C and D and the right triangle formed by points C, E and the center point of the optical recording disk is defined as the length between points A and C. A step of detecting the position of the center point of the optical recording disk by obtaining a length from the point C to the center point of the optical recording disk by multiplying the center point of the optical recording disk. program.