JP3900270B2

JP3900270B2 - Printing device, disc center point detection control program

Info

Publication number: JP3900270B2
Application number: JP2002216196A
Authority: JP
Inventors: 勝彦西坂
Original assignee: Seiko Epson Corp
Current assignee: Seiko Epson Corp
Priority date: 2002-07-25
Filing date: 2002-07-25
Publication date: 2007-04-04
Anticipated expiration: 2022-07-25
Also published as: JP2004058291A

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
６３ＰＷセンサ
Ｘ主走査方向
Ｙ副走査方向[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a printing apparatus having a so-called CD-R printing function for executing printing on a label surface of an optical recording disk such as a CD-R, and a printing execution area for executing printing on the label surface of an optical recording disk. The present invention relates to a disc center point detection control program for detecting the center point of an optical recording disc which is a reference for determining the recording medium.
[0002]
[Prior art]
An optical recording disk having a disk shape such as a CD-R can write information and the like printed on the optical recording disk in a predetermined region on the side opposite to the printing surface, that is, a so-called label surface. A printing apparatus that performs printing on the label surface is disclosed in Japanese Patent Laid-Open No. 11-5332, and a printing method is disclosed in Japanese Patent No. 2794628. Also, 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. This is because the optical recording disk is mounted on a mounting portion made 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 a transport roller. Then, printing is performed on the label surface of the optical recording disk by the print head.
[0003]
However, in the above-described conventional printing apparatus and printing method, no means for detecting the exact position of the optical recording disk on which printing is performed is disclosed, and there is a shift between the position of the optical recording disk and the print execution range. If the printing is executed as it is, the printing position may be misaligned, the printing range may be outside the printable area on the label surface of the optical recording disk, and the optical recording disk may be stained with ink. It tends to occur.
[0004]
Therefore, as an example of a conventional technique for solving such a problem, Japanese Patent Application Laid-Open No. 2002-127530 detects a convex portion in which a center hole of an optical recording disk mounted on a disk tray is fitted. A printing apparatus is disclosed that calculates the center position of an optical recording disk from the detected position of the convex portion and determines a print execution range based on the calculated center position of the optical recording disk. Also known is a technique for calculating and determining the position of an optical recording disk by providing a mark on the disk tray and detecting the position of the mark.
[0005]
However, since the position of the optical recording disk is indirectly detected by detecting a part of the disk tray loaded with the optical recording disk or a mark attached to the disk tray in this way, There may be a slight shift 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 printing cannot always be performed at a predetermined printing position on the optical recording disk with high accuracy. In addition, since it is impossible to detect the mounting state of the optical recording disk on the tray, there is a possibility that printing may be executed without mounting the optical recording disk on the tray. For this reason, a technique for accurately detecting the position of the optical recording disk by means for directly detecting the optical recording disk is known, and the optical recording disk disposed on the optical recording disk so as to be capable of reciprocating in the main scanning direction. And a sensor for detecting the optical recording disk by scanning the optical recording disk with the sensor by means of a sensor capable of detecting the optical recording disk and means for conveying the optical recording disk in the sub-scanning direction (direction orthogonal to the main scanning direction). . For example, as shown in FIG. 9, the four positions of the front end TE, the rear end BE, the left end LE, and the right end RE of the outer peripheral edge of the optical recording disk 11 are detected, and the optical recording disk is detected from the detected positions of the four outer peripheral edges. 11 center points CP are obtained, and a print execution area is set based on the center point CP and the positions of the outer peripheral edges. As described above, since the print execution area is set by directly detecting the optical recording disk 11, there is no possibility of printing deviation with respect to the label surface of the optical recording disk 11, and printing on the label surface is always executed with high accuracy. Can do.
[0006]
[Problems to be solved by the invention]
However, as described above, when the four positions of the front end TE, the rear end BE, the left end LE, and the right end RE of the outer peripheral edge of the optical recording disk 11 are detected, the scanning distance of the sensor is long, and the sub-recording of the optical recording disk 11 therefor A great 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. Since the center hole 12 formed at the center of the optical recording disk 11 is scanned, 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, there is a problem that the masking process of the sensor or the like is required to prevent erroneous detection with the inner peripheral edge of the center hole 12 as the outer peripheral edge, and the detection procedure of the optical recording disk 11 becomes complicated.
[0007]
Furthermore, if the label surface of the optical recording disk 11 is damaged, the print data of the optical recording disk 11 may not be read. Although not normally possible, for example, when the optical recording disk 11 is transported by a transport means such as a transport roller, small dust or the like adhering to the label surface is placed between the transport roller and the label surface of the optical recording disk 11. In some cases, the label surface may be scratched. Therefore, as shown in FIG. 9, when the optical recording disk 11 is scanned from the leading end TE to the trailing end BE of the optical recording disk 11, the optical recording disk 11 is conveyed by the conveying means during that time. Not only when printing on the surface, but also when detecting the position of the optical recording disk 11, there is a possibility that the label surface of the optical recording disk 11 is damaged over the entire region from the leading end TE to the trailing end BE of the optical recording disk 11. It was not possible to say that it was preferable.
[0008]
The present invention has been made in view of such a situation, and the problem is that the position of the optical recording disk for setting the print execution area can be detected with high accuracy in a short time, and the optical recording is performed. An object of the present invention is to provide a printing apparatus that 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 is an optical recording disk printing means for performing printing in a printing area set on a label surface of the optical recording disk based on the position of the center point of the optical recording disk. A disk outer periphery detecting means disposed on the optical recording disk so as to be capable of scanning in the main scanning direction and capable of detecting an outer periphery of the optical recording disk, and a disk transport for transporting the optical recording disk in the sub-scanning direction. And a disk center point detection control means for controlling the disk outer periphery detection means and the disk transport means to detect the position of the center point of the optical recording disk, The center point detection control means detects three outer peripheral edges of the optical recording disk, and detects the position of the central point of the optical recording disk based on the detected positions of the three outer peripheral edges. To it is printing apparatus characterized by.
[0010]
Since the center point of the circle can be obtained from the positions of the three points on the circumference, three outer peripheral edges of the optical recording disk are detected, and the central point of the optical recording disk is determined based on the detected positions of the outer peripheral edges. Can be detected. Therefore, the amount of scanning by a detecting means such as a sensor for detecting the outer peripheral edge of the optical recording disk can be reduced, compared to the conventional detection of the outer peripheral edge of the front and rear ends and the left and right ends of the optical recording disk in a total of four places. 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. In addition, since the scanning amount by the detecting means such as a sensor for detecting the outer peripheral edge of the optical recording disk can be reduced, the transport amount by the disk transporting means is reduced, whereby the optical recording disk is transported by the disk transporting means. The risk of scratching the label surface during printing can be reduced.
[0011]
As a result, 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 when the optical recording disk is transported by the disk transporting means. Since the risk of scratching the surface can be reduced, the position of the optical recording disk for setting the print execution area can be detected with high accuracy in a short time, and the position of the optical recording disk can be detected. There is an effect that the risk of damaging the label surface of the optical recording disk can be 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. After detecting the outer periphery of the optical recording disk by the optical recording disk detecting means and detecting the optical recording disk by the optical recording disk detecting means, the optical recording disk is transported by a predetermined transport amount and stopped. A first outer periphery detecting means for scanning the optical recording disk in the main scanning direction by the disk outer periphery detecting means to detect both outer peripheral edges of the optical recording disk on a scanning line; After the detection point of the disk outer periphery detection means is moved to an intermediate point between both outer edges of the optical recording disk detected by the periphery detection means, the optical recording disk is conveyed in the direction opposite to the sub-scanning direction. And a second outer periphery detecting means for detecting an outer periphery on the downstream side in the sub-scanning direction of the optical recording disk by the disk outer periphery detecting means, and two points detected by the first outer periphery detecting means. The position of the center point of the optical recording disk is calculated from the position of the outer periphery of the optical recording disk and the position of the outer periphery detected by the second outer periphery detection means.
[0013]
First, the outer peripheral edge on the downstream side in the sub-scanning direction of the optical recording disk is detected by the 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 need not be the outermost peripheral edge on the most downstream side in the sub-scanning direction, and the vicinity thereof is sufficient. 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 are detected from the detected outer peripheral edge.
[0014]
Next, after the optical recording disk is transported by a predetermined transport amount and stopped, the optical recording disk is scanned in the main scanning direction by the disk outer periphery detection means, and both outer peripheral edges of the optical recording disk on the scanning line are scanned. Detect each. Subsequently, after the detection point of the disk outer periphery detection means is moved to the intermediate point between both outer periphery edges, the optical recording disk is transported in the direction opposite to the sub-scanning direction, and again on the downstream side of the optical recording disk in the sub-scanning direction. Detect the outer periphery. An intermediate point between both 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 moving the detection point of the disk outer periphery detection means to the intermediate point, the outer periphery of the optical recording disk detected by conveying the optical recording disk in the direction opposite to the sub-scanning direction is the optical recording in the sub-scanning direction. This is the outer periphery 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, they are in a positional relationship that is line symmetric with respect to the central axis of the optical recording disk in the sub-scanning direction. Become.
[0016]
Thereby, according to the printing apparatus which concerns on invention of Claim 2 of this application, in addition to the effect by the invention of Claim 1 of this application, the detected three outer periphery has the positional relationship mentioned above. As a result, the operation and effect that the calculation of the center point position of the optical recording disk can be facilitated can be obtained.
[0017]
According to a third aspect of the present invention, in the second aspect, the first outer peripheral edge detecting unit detects the outer peripheral edge of the optical recording disc, and the disc outer peripheral edge detecting unit mainly detects the optical recording disk. 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 central hole of the optical recording disk. It is a printing device.
[0018]
In this way, when the optical recording disk is scanned in the main scanning direction by the disk outer periphery detection means, the center hole of the optical recording disk is not scanned, so that the inner periphery of the center hole is erroneously detected as the outer periphery. There is no end to it. Therefore, according to the printing apparatus according to the third aspect of the present invention, in addition to the function and effect of the second aspect of the present invention, for example, the detection point of the disk outer periphery detection means scans the vicinity of the center hole. Thus, there is an effect that the means for ignoring the disc edge detected during the operation as the inner peripheral edge of the center hole becomes unnecessary.
[0019]
According to a fourth aspect of the present invention, in the second aspect, the first outer peripheral edge detecting unit detects the outer peripheral edge of the optical recording disk, and then the outer peripheral edge detecting unit detects the optical recording disk. When scanning in the scanning direction, the optical recording disk is transported to a position capable of scanning between the outer peripheral edge of the optical recording disk detected by the optical recording disk detection means and the central hole of the optical recording disk. This is a printing apparatus.
[0020]
According to the printing apparatus according to the fourth aspect of the present invention, in addition to the function and 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 periphery detecting means. By scanning between the outer peripheral edge of the optical recording disk detected by the optical recording disk detection means and the central hole of the optical recording disk, the central hole of the optical recording disk is not scanned. It is possible to eliminate 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]
The invention according to claim 5 of the present application is the disk center point detection control means according to any one of claims 1 to 4, wherein the outer peripheral edges of the three detected optical recording disks are defined as point A and point B. , And C point, the position of the intersection of the perpendicular bisector connecting the point A and the point C and the perpendicular bisector connecting the point B and the point C is calculated. Accordingly, the position of the center point of the optical recording disk is detected.
[0022]
If three points on the same circumference are point A, point B, and point C, then a perpendicular bisector connecting the point A and the point C and a line segment connecting the point B and the point C The intersection with the perpendicular bisector is the center point of the circle. Therefore, according to the printing apparatus according to the fifth aspect of the present invention, the outer peripheral edges of the three detected optical recording disks are set to the points A, B, and C, and the points A and C are connected. The center point of the optical recording disk can be calculated by calculating the position of the intersection of the perpendicular bisector of the ellipse line and the perpendicular bisector of the line segment connecting points B and C. .
[0023]
A sixth aspect of the present invention is the optical recording disk according to any one of the second to fourth aspects, wherein the disk center point detection control means detects the outer peripheral edges of the optical recording disk detected by the first outer peripheral edge detection means. Are the A point and the B point, the outer peripheral edge of the optical recording disk detected by the second outer peripheral edge detecting means is the C point, the intermediate point between the A point and the B point is the D point, and the A point A first right triangle formed by similar points A, C, and D, a point C, a point E, and a center point of the optical recording disk By multiplying the similarity ratio with the second right triangle formed by the length between point A and point C to obtain the length from point C to the center point of the optical recording disk, A printing apparatus that detects the position of the center point of an optical recording disk.
[0024]
First, both outer peripheral edges of the optical recording disc detected by the first outer peripheral detection means are designated as points A and B, and the outer peripheral edge of the optical recording disc detected by the second outer peripheral detection means is designated as C point. Further, an intermediate point between points A and B is set as D point, and an intermediate point between points A and C is set as E point. Then, the first right triangle formed by the points A, C, and D and the second right triangle formed by the points C, E, and the center point of the optical recording disk are similar right angles. It becomes a triangle. Therefore, the similarity ratio is obtained, and the length of the side connecting the point A and the point 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. By multiplying the similarity 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 is obtained. Can be requested.
[0025]
The invention according to claim 7 of the present application is directed to 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 on the optical recording disk. In a printing apparatus, comprising: a disk outer periphery detecting means arranged to be able to scan in the main scanning direction and capable of detecting an outer periphery of the optical recording disk; and a disk transporting means for transporting the optical recording disk in the sub-scanning direction. And 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 detection means and the disc transport means. A procedure for detecting three outer 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 positions of the outer peripheral edges of the three positions. With the door, it is a disc center point detection control program characterized.
[0026]
According to the disc center point detection control program according to the seventh aspect of the present invention, the same function and effect as those of the first aspect of the present invention described above can be obtained. The effect similar to that of the first aspect of the present invention described above can be brought to any printing apparatus that can be executed.
[0027]
The invention according to claim 8 of the present application is the optical recording disk according to claim 7, 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 periphery detection means. After detecting the outer periphery of the optical recording disc in the detection procedure and the optical recording disc detection procedure, the optical recording disc is transported and stopped by a predetermined transport amount, and then the disc outer periphery detection means A first outer periphery detection procedure for scanning the optical recording disk in the main scanning direction to detect both outer peripheral edges of the optical recording disk on the scanning line, and the light detected by the first outer peripheral detection procedure After moving the detection point of the disk outer peripheral edge detection means to the intermediate point between the outer peripheral edges of the recording disk, the optical recording disk is transported in the direction opposite to the sub-scanning direction, and again the sub-scanning direction of the optical recording disk A second outer peripheral edge detecting procedure for detecting the outer peripheral edge on the flow side by the disc outer peripheral edge detecting means; the positions of the two outer peripheral edges detected by the first outer peripheral edge detecting procedure; and the second outer peripheral edge position. A disc center point detection control program comprising: a procedure for calculating the position of the center point of the optical recording disc from the position of the outer periphery detected by the periphery detection procedure.
[0028]
According to the disk center point detection control program according to the invention described in claim 8, it is possible to obtain the same operation effect as that of the invention described in claim 2 described above. The effect similar to that of the above-described invention according to claim 2 can be provided to any printing apparatus that can be executed.
[0029]
The invention according to claim 9 of the present application is the optical recording disk according to claim 8, wherein in the first outer periphery detection step, the outer periphery of the optical recording disk is detected, and then the optical recording disk is mainly detected by the disk outer periphery detection 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 central 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 invention of claim 9 of the present application, the same function and effect as the invention of claim 3 described above can be obtained, and this disk center point detection control program is An effect similar to that of the above-described invention according to claim 3 can be provided to any printing apparatus that can be executed.
[0031]
The invention according to claim 10 of the present application is the optical recording disk according to claim 8, wherein the first outer peripheral edge detection step is performed by detecting the outer peripheral edge of the optical recording disk, and then detecting the optical recording disk by the disk outer peripheral edge detection means. When scanning in the scanning direction, the optical recording disk is transported to a position capable of scanning between the outer peripheral edge of the optical recording disk detected by the optical recording disk detection procedure and the central hole of the optical recording disk. This is a disc center point detection control program.
[0032]
According to the disc center point detection control program according to the invention described in claim 10 of the present application, the same function and effect as those of the invention described in claim 4 can be obtained, and the disc center point detection control program is executed. An effect similar to that of the above-described invention according to claim 4 can be provided to any printing apparatus that can be executed.
[0033]
The invention according to claim 11 of the present application is that, in any one of claims 7 to 10, the detected outer peripheral edges of the three optical recording disks are point A, point B, and point C. The center point of the optical recording disk is calculated by calculating the position of the intersection of the perpendicular bisector connecting the C point and the perpendicular bisector connecting the B point and the C point. A disc center point detection control program characterized by having a procedure for detecting the position of the disc.
[0034]
According to the disc center point detection control program according to the invention of claim 11 of the present application, the same function and effect as the invention of claim 5 described above can be obtained, and this disc center point detection control program is The same operation effect as that of the above-described invention according to claim 5 can be provided to any printing apparatus that can be executed.
[0035]
The invention according to claim 12 of the present application is that, in any one of claims 8 to 10, the 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 periphery of the optical recording disk detected by the second outer periphery detection 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 A similarity ratio between a right triangle formed by similar points A, C, and D and a right triangle formed by C point, E point, and the center point of the optical recording disk, Multiplying the length between point A and point C to obtain the length from point C to the center point of the optical recording disk, thereby detecting the position of the center point of the optical recording disk; This is a disc center point detection control program.
[0036]
According to the disc center point detection control program according to the invention of claim 12 of the present application, the same function and effect as the invention of claim 6 of the present application can be obtained, and An effect similar to that of the invention described in claim 6 can be provided to any printing apparatus that can be executed.
[0037]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described 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 including a paper feed button 7 and a paper discharge unit 6 formed on the front side of the main body 5. The ink jet printing apparatus 50 is usually for printing on paper. When the paper is used as a printing material, a paper feed tray for stocking the paper can be attached to the rear side of the main body 5. It is like that. A disc tray receiving portion 32 is formed on the front side of the main body 5, and the tray attachment 3 can be attached to the disc tray receiving portion 32 from the front side. The tray attachment 3 is composed of a flat plate-like black plastic supported so as to be slidable in the front-rear direction along a tray support 31 provided on the left and right sides and a guide formed inside the tray support 31. And a disc tray 2. On the disc tray 2, there is formed a storage portion 22 for an optical recording disc 11 that is a printing object such as a CD-R, and a convex portion having the same diameter as a hole formed in the center of the optical recording disc 11 is formed at the center. A portion 21 is formed. The convex portion 21 is formed so that the optical recording disk 11 can be disposed 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 principal part showing an ink jet printing apparatus 50 according to the present invention. FIG. 3 is a side view of the main part.
[0040]
The ink jet printing apparatus 50 is provided with a carriage 61 that is supported by a carriage guide shaft 51 and moves in the main scanning direction X by a control signal from the control unit 20. A platen 52 is provided facing the carriage 61. The carriage 61 is mounted with a recording head 62 as “label surface printing means” for performing printing by discharging ink onto the label surface of the optical recording disk 11 mounted on the disk tray 2 as a printing material. The recording head 62 is placed on the label surface of the optical recording disk 11 while the optical recording disk 11 mounted on the disk tray 2 between the carriage 61 and the platen 52 is transported in the sub-scanning direction Y. Printing is performed on the label surface of the optical recording disk 11 by ejecting ink. In addition, a PW sensor 63 capable of detecting the outer periphery of the optical recording disk 11 is mounted on the carriage 61 as “disc outer periphery detection means” that detects 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 ink jet printing apparatus 50 is provided with a transport driving 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. It has been. The conveyance drive roller 53 is rotationally controlled by a rotational driving force such as a stepping motor based on a control signal from the control unit 20, and the disk tray 2 is conveyed in the sub-scanning direction Y by the rotation of the conveyance drive roller 53. A plurality of transport driven rollers 54 are provided and are individually urged by the transport drive roller 53, and come into contact with the disk tray 2 when the disk tray 2 is transported by the rotation of the transport drive roller 53. Rotates following the conveyance. The recording head 62 as “label surface printing means” is a means for printing not only the label surface of the recording disk 11 but also printing paper such as plain paper as a printing material. It goes without saying that not only the tray 2 but also means for conveying printing paper such as plain paper as a printing material.
[0042]
On the other hand, a discharge driving roller 55 and a discharge driven roller are used as discharge means for printing material to be printed after discharging printing paper such as plain paper after printing or the disk tray 2 that has finished printing on the label surface of the optical recording disk 11. 56 is provided. The discharge driving roller 55 is rotationally controlled by a rotational driving force such as a stepping motor, and the printing material is discharged in the sub-scanning direction Y by the rotation of the discharge driving roller 55. The discharge driven roller 56 is provided with a plurality of teeth, and has a plurality of teeth around the teeth, and each tooth has a toothed roller that is sharply pointed so as to make point contact with the printing surface of the printing material. When the printing material is ejected by the rotation of the ejection driving roller 55 by being urged by the ejection driving roller 55 with an urging force weaker than the urging force of the transport driven roller 54, the printing is performed in a state where the printing material is in contact with the printing surface. It rotates following the discharge of the material.
[0043]
When the tray attachment 3 is inserted, the disc tray receiving portion 32 is sandwiched between the flat plate tray 2 between the discharge drive roller 55 and the discharge driven roller 56 and between the transfer drive roller 53 and the transfer driven roller 54. Thus, the disc tray 2 can be moved 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. It has become.
[0044]
Further, the control unit 20 controls the carriage 61 on which the PW sensor 63 serving as the “disc outer peripheral edge detecting unit” described above is mounted and the transport driving roller 53 serving as the “disk transport unit”. The position of the center point of the optical recording disk 11 is detected based on the detection position of the outer peripheral edge of the optical recording disk 11 detected by the PW sensor 63 after scanning the optical recording disk 11 in the main scanning direction X and the sub-scanning direction Y. “Disk center point detection control means”.
[0045]
Subsequently, 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 printer 50, and the light mounted on the disk tray 2 after mounting. A 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 to 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 attached. At that time, the conveyance driven roller 54 and the discharge driven roller 56 are put into a release state by a release means (not shown). Next, the disc tray 2 loaded with the optical recording disc 11 is pushed into the main body 5 with the label side 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 PW sensor 63 moves the optical recording disk 11 in the main scanning direction. X can be scanned. Similarly, by the control from the control unit 20, the disc drive 2 moves in the sub-scanning direction Y or in the direction opposite to the sub-scanning direction Y by the forward rotation or reverse rotation of the transport driven roller 54, whereby the PW sensor 63. The optical recording disk 11 can be scanned in the sub-scanning direction Y or in the direction opposite to the sub-scanning direction Y.
[0049]
First, when the paper feed button 7 is pressed while the disk tray 2 is mounted on the ink jet printing apparatus 50, the detection point of the PW sensor 63 is on the center axis line of the optical recording disk 11 in the sub-scanning direction Y from the home position of the carriage 61. It moves until it is in the vicinity (step S1). From that state, until the PW sensor 63 detects the outer peripheral edge of the optical recording disk 11, the transport driving roller 53 is rotated to transport the disk tray 2 in the sub-scanning direction Y (step S2). As a result, the presence / absence and approximate position of the optical recording disk 11 can be detected.
[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 the symbol SC2 in FIG. The optical recording disk 11 is scanned, and the detected position of the 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). In other words, the optical recording disk 11 is scanned in the direction indicated by reference numeral SC3 in FIG. 5, and the detected position of the outer peripheral edge is set as the outer peripheral edge RE (step S7).
[0051]
Here, the carry amount d is set to such a carry amount that the detection point of the PW sensor 63 is located between the outer peripheral edge detected in step S <b> 2 of the optical recording disk 11 and the center hole 12. Accordingly, when the optical recording disk 11 is scanned in the main scanning direction in step S4 and step S6, the central 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. Furthermore, since the transport amount d is a transport amount that does not reach the position where the optical recording disk 11 contacts the discharge driven roller 56, the acute angle of the discharge driven roller 56 is detected 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 scratched 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 peripheral edge LE and the outer peripheral edge RE (step S8), and the detection point of the PW sensor 63 is detected. Is the intermediate point SP (step S9). Subsequently, until the outer peripheral edge of the optical recording disk 11 is detected by the PW sensor 63 from that state, the optical recording disk 11 is transported in the direction opposite to the sub-scanning direction Y (step S10), that is, in FIG. The optical recording disk 11 is scanned in the direction indicated by reference numeral SC5, and the detected position of the outer peripheral edge is set as the outer peripheral edge TE (step S11). Since the outer peripheral edge LE and the outer peripheral edge RE are located on the same main scanning line, the intermediate point SP is located on the central axis line in the sub-scanning direction Y passing through the center point CP of the optical recording disk 11. Become. Accordingly, 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 manner, the positions of the outer peripheral edge LE, the outer peripheral edge RE, and the outer peripheral edge TE are detected, and then the position of the stop point CP of the optical recording disk 11 is calculated based on the positions of the three outer peripheral edges. The detection procedure will be described with reference to FIG. 6, FIG. 7, and FIG. FIG. 6 is a flowchart showing a procedure for detecting the position of the center point CP of the optical recording disk 11. 7 and 8 are plan views of the optical recording disk 11 schematically showing the process of detecting the position of the center point CP of the optical recording disk 11. FIG.
[0054]
Here, the detected positions of the outer peripheral edge LE, the outer peripheral edge RE, the outer peripheral edge TE, and the intermediate point SP are determined based on the position of the PW sensor 63 (position of the carriage 61) and the sub-scanning direction Y in the main scanning direction X at the time of detection. Based on the transport position of the optical recording disk 11, the XY coordinates with the reference point DP as the origin are replaced. A right triangle formed by the outer periphery LE (or outer periphery RE), the intermediate point SP, and the outer periphery TE is defined 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 obtained (step S21). The base Ax has a length that halves the length from the position of the outer peripheral edge LE on the X axis to the position of the outer peripheral edge RE 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 obtained from Ax obtained from the equation (1) and Ay obtained from the equation (2) (step S23).
[0058]
Ao = √ (Ax ² + Ay ² (3)
Here, a right triangle formed by the midpoint of Yo obtained from Expression (3), the outer peripheral edge TE, and the center point CP 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 and the angle between the height By and the hypotenuse Bo are the same angle. . Accordingly, by obtaining the similarity ratio between the right triangle A and the right triangle B, 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, and thereby the optical recording disk 11. The position of the central point CP can be obtained.
[0059]
Subsequently, the height By of the right triangle B is obtained (step S24). The height By is ½ 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)
Equation (6) can be derived from Equation (5), and by substituting height Ay, hypotenuse Ao, and height By determined from Equation (2), Equation (3), and Equation (4), The length of Bo can be obtained.
[0062]
Then, the positions of the center point CP in the X-axis direction and the Y-axis direction are 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 to the intermediate point SP in the X-axis direction, the distance X from the reference point DP to the outer peripheral edge RE in the X-axis direction is from the outer peripheral edge LE. It is obtained by adding a length that is ½ 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 to the outer peripheral point TE in the Y-axis direction (step S27). ).
[0064]
Yo = TE + Bo (8)
In this way, the position of the center point CP of the optical recording disk 11 can be accurately detected based on the detected positions of the three outer peripheral edges. Further, since the distance over which the PW sensor 63 scans the optical recording disk 11 can be significantly shortened compared to the conventional case, the time required for detecting the position of the center point CP of the optical recording disk 11 can be greatly reduced. Can do. Further, since the optical recording disk 11 is not transported to the position where the discharge driven roller 56 contacts the label surface of the optical recording disk 11 while scanning the optical recording disk 11 by the PW sensor 63, the discharge driven roller 56 has a sharp point. It is possible to prevent the label surface of the optical recording disk 11 from being damaged by the teeth.
[0065]
It should be noted that the present invention is not limited to the above-described 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 present invention. Needless to say.
[0066]
【The invention's effect】
According to the present invention, the position of the optical recording disk for setting the print execution area can be detected with high accuracy 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. Therefore, it is possible to provide a printing apparatus that is less likely to be lost.
[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 plan view of an essential part showing an ink jet printing apparatus according to the present invention.
FIG. 3 is a side view of an essential part showing an 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 disk schematically showing the process of detecting the position of the center point of the optical recording disk, and showing the process of obtaining the hypotenuse of the first right triangle.
FIG. 8 is a plan view of the optical recording disk schematically showing the process of detecting the position of the center point of the optical recording disk, showing the process of obtaining the hypotenuse of the second right triangle.
FIG. 9 is a plan view of an optical recording disk schematically showing a process of detecting the position of the center point of the optical recording disk in the prior art.
[Explanation of symbols]
2 Disc tray
3 Tray attachment
11 Optical recording disc
12 Center hole
20 Control unit
21 Convex
22 Storage section
50 Printing device
51 Carriage guide shaft
52 Platen
53 Transport drive roller
54 Conveyor driven roller
55 Discharge drive roller
56 Discharged driven roller
61 Carriage
62 Recording head
63 PW sensor
X Main scan direction
Y Sub-scanning direction

Claims

An optical recording disk printing means for executing printing in 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;
A disc outer periphery detecting means disposed on the optical recording disc so as to be capable of scanning in the main scanning direction and capable of detecting an outer periphery of the optical recording disc;
Disk transport means for transporting the optical recording disk in the sub-scanning direction;
A printing apparatus comprising: a disk center point detection control unit configured to control the disk outer periphery detection unit and the disk transport unit to detect a position of a center point of the optical recording disk;
The disc center point detection control means detects three outer peripheral edges of the optical recording disc, and detects the position of the central point of the optical recording disc based on the detected positions of the outer peripheral edges of the three locations. Printing device.

2. The optical recording disk detection 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 downstream in the sub-scanning direction by the disk outer periphery detection means. Means,
After the outer periphery of the optical recording disk is detected by the optical recording disk detection means, the optical recording disk is transported and stopped by a predetermined transport amount, and then the optical recording disk is removed by the disk outer periphery detection means. First outer peripheral edge detecting means for scanning in the main scanning direction to detect both outer peripheral edges of the optical recording disk on the scanning line;
After moving the detection point of the disk outer periphery detection means to the intermediate point between both outer edges of the optical recording disk detected by the first outer periphery detection means, the optical recording disk is opposite to the sub-scanning direction. A second outer peripheral edge detecting means for detecting the outer peripheral edge of the optical recording disk downstream in the sub-scanning direction by the disk outer peripheral edge detecting means.
Calculating the position of the center point of the optical recording disk from the positions of the two outer peripheral edges detected by the first outer peripheral edge detecting means and the positions of the outer peripheral edges detected by the second outer peripheral edge detecting means; A printing apparatus characterized by that.

3. The optical disk according to claim 2, wherein the first outer periphery detecting means detects the outer periphery of the optical recording disk and then scans the optical recording disk in the main scanning direction by the disk outer periphery detecting means. 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 central hole of the recording disk.

3. The optical disk according to claim 2, wherein the first outer periphery detecting means detects the outer periphery of the optical recording disk and then scans the optical recording disk in the main scanning direction by the disk outer periphery detecting means. A printing apparatus, wherein the optical recording disk is transported to a position where scanning is possible between an outer peripheral edge of the optical recording disk detected by a recording disk detection means and a central hole of the optical recording disk.

5. The disc center point detection control means according to claim 1, wherein the detected outer peripheral edges of the three optical recording discs are point A, point B, and point C, and point A and point C By calculating the position of the intersection of the perpendicular bisector connecting the points and the perpendicular bisector connecting the points B and C, the center point of the optical recording disk is calculated. A printing apparatus characterized by detecting a position.

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

Label surface printing means for executing 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 on the optical recording disk so as to be able to scan in the main scanning direction. In the printing apparatus, comprising: a disk outer periphery detecting means capable of detecting an outer periphery of the optical recording disk; and a disk transporting means for transporting the optical recording disk in a sub-scanning direction. A disc center point detection control program for causing a computer to execute control for controlling the disc transport means to detect the position of the center point of the optical recording disc,
A procedure for detecting three outer peripheral edges of the optical recording disk;
A disc center point detection control program, comprising: a step of detecting the position of the center point of the optical recording disc based on the detected positions of the three outer peripheral edges.

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

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

9. The first outer periphery detection procedure according to claim 8, wherein the first outer periphery detection step detects the outer periphery of the optical recording disk and then scans the optical recording disk in the main scanning direction by the disk outer periphery detection means. Disc center point detection control, wherein the optical recording disc is transported to a scannable position between an outer peripheral edge of the optical recording disc detected by a recording disc detection procedure and a center hole of the optical recording disc. program.

The vertical segment of the line connecting the points A and C 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. Having a procedure of detecting the position of the central point of the optical recording disk by calculating the position of the intersection of the bisector and the perpendicular bisector connecting the B and C points Disc center point detection control program.

11. The optical disk according to claim 8, wherein both outer peripheral edges of the optical recording disk detected by the first outer peripheral edge detecting means are point A and B, and are detected by the second outer peripheral edge detecting means. The outer peripheral edge of the optical recording disk is C point, the intermediate point between point A and B is D point, the intermediate point between point A and C is E point, The similarity ratio between the right triangle formed by the C point and the D point and the right triangle formed by the C point, the E point, and the center point of the optical recording disk is expressed as the length between the A point and the C point. The center of the optical recording disk is detected by calculating the length from the point C to the center of the optical recording disk by multiplying the distance by the length of the optical recording disk. program.