JPH10129035A - Optical printing head - Google Patents
Optical printing headInfo
- Publication number
- JPH10129035A JPH10129035A JP28874896A JP28874896A JPH10129035A JP H10129035 A JPH10129035 A JP H10129035A JP 28874896 A JP28874896 A JP 28874896A JP 28874896 A JP28874896 A JP 28874896A JP H10129035 A JPH10129035 A JP H10129035A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting element
- lens
- emitting elements
- arrays
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
- B41J2/45—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using light-emitting diode [LED] or laser arrays
- B41J2/451—Special optical means therefor, e.g. lenses, mirrors, focusing means
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Mounting And Adjusting Of Optical Elements (AREA)
- Facsimile Heads (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電子写真プリンタ等
の露光装置として組み込まれる光プリンタヘッドの改良
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an optical printer head incorporated as an exposure device for an electrophotographic printer or the like.
【０００２】[0002]
【従来の技術】近年、光プリンタヘッドの光学系として
非球面レンズを用いることが提案されており、かかる非
球面レンズはビームのすそ引きが少なく、隣接する発光
素子からの光の干渉による影響を受けにくい特性を有し
ていることから、解像度が高く、高精度の重ね合わせが
必要なカラーグラフィック等の用途に適したものとして
注目されている。2. Description of the Related Art In recent years, it has been proposed to use an aspherical lens as an optical system of an optical printer head. Such an aspherical lens has a small beam tail and is less affected by light interference from an adjacent light emitting element. Since it has characteristics that are difficult to receive, it is attracting attention as being suitable for uses such as color graphics that require high resolution and high-precision superposition.
【０００３】このような従来の光プリンタヘッドは、例
えば、ガラスやセラミック等から成るベースプレート上
に、複数個の発光素子が一定のピッチで配列された発光
素子アレイを複数個、直線状に配列実装させるととも
に、前記発光素子アレイ上に複数個の非球面レンズを配
設した構造を有しており、前記各発光素子アレイの各発
光素子を外部からの印画信号に対応させて個々に選択的
に発光させるとともに、該発光素子の発した光（ビー
ム）を非球面レンズを介して外部の感光体に結像させ、
感光体面に所定の潜像を形成することによって光プリン
タヘッドとして機能する。In such a conventional optical printer head, a plurality of light emitting element arrays in which a plurality of light emitting elements are arranged at a fixed pitch are linearly arranged on a base plate made of, for example, glass or ceramic. And a structure in which a plurality of aspherical lenses are arranged on the light emitting element array, and each light emitting element of each light emitting element array is selectively selectively corresponding to an external printing signal. While emitting light, the light (beam) emitted from the light emitting element is imaged on an external photoreceptor via an aspheric lens,
By forming a predetermined latent image on the photoreceptor surface, it functions as an optical printer head.
【０００４】尚、前記発光素子アレイとしては、例え
ば、同一サイズの発光ダイオード素子（以下、ＬＥＤと
略記する）を６４個、直線状に配列させて成るＬＥＤア
レイ等が用いられ、かかるＬＥＤアレイを用いてＡ４サ
イズ、３００ｄｐｉの光プリンタヘッドを形成する場合
には、４０個のＬＥＤアレイをその各々が前述した非球
面レンズと１対１に対応するようにしてベースプレート
上に載置させることにより光プリンタヘッドが構成され
る。As the light emitting element array, for example, an LED array in which 64 light emitting diode elements (hereinafter abbreviated as LEDs) of the same size are linearly arranged is used. When an A4 size, 300 dpi optical printer head is formed by using the above, the 40 LED arrays are mounted on the base plate in such a manner that each of the 40 LED arrays corresponds to the aspherical lens described above on a one-to-one basis. A printer head is configured.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、この従
来の光プリンタヘッドにおいては、光学系として用いら
れる非球面レンズが所定の収差を有しており、該レンズ
の周辺域を透過するビームの輪郭が前記収差によって若
干、ぼやける傾向がある。このため、各発光素子アレイ
の両端域に位置する発光素子からのビームの強度が中央
域に位置する発光素子からのものよりも弱くなってしま
い、その結果、感光体上に照射されるビームの強度、大
きさにバラツキを生じて印画の濃度むらが形成される欠
点を有している。However, in this conventional optical printer head, the aspherical lens used as the optical system has a predetermined aberration, and the contour of the beam transmitted through the peripheral area of the lens is not sufficient. The aberration tends to be slightly blurred. For this reason, the intensity of the beam from the light emitting elements located at both end areas of each light emitting element array becomes weaker than that from the light emitting element located at the central area, and as a result, the intensity of the beam irradiated on the photoconductor is reduced. There is a drawback that unevenness in strength and size is caused to cause unevenness in density of a print.
【０００６】[0006]
【課題を解決するための手段】本発明は上記欠点に鑑み
案出されたもので、ベースプレート上に、多数の発光素
子が直線状に配列された発光素子アレイを複数個、列状
に配置させるとともに、これら発光素子アレイ上に該ア
レイと１対１に対応する複数個の非球面レンズを配設さ
せて成る光プリンタヘッドであって、前記各発光素子ア
レイの両端域に位置する発光素子の長さを中央域に位置
する発光素子よりも長くなし、且つ該発光素子アレイと
前記非球面レンズとの間に前記発光素子の長さに対応さ
せて曲率を変化させたシリンドリカルレンズを配置した
ことを特徴とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and a plurality of light-emitting element arrays in which a large number of light-emitting elements are linearly arranged on a base plate. And an optical printer head comprising a plurality of aspherical lenses corresponding to the light emitting element arrays in a one-to-one correspondence with the light emitting element arrays, the light emitting elements being located at both end areas of each light emitting element array. The length is not longer than that of the light emitting element located in the central area, and a cylindrical lens whose curvature is changed between the light emitting element array and the aspherical lens according to the length of the light emitting element is arranged. It is characterized by.
【０００７】[0007]
【発明の実施の形態】以下、本発明を添付図面に基づい
て詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
【０００８】図１は本発明の光プリンタヘッドの一形態
を示す縦断面図、図２は図１の光プリンタヘッドの横断
面図であり、１はベースプレート、２は発光素子アレ
イ、２ａは発光素子、３は非球面レンズ、４はシリンド
リカルレンズである。FIG. 1 is a longitudinal sectional view showing one embodiment of the optical printer head of the present invention, and FIG. 2 is a transverse sectional view of the optical printer head of FIG. 1, wherein 1 is a base plate, 2 is a light emitting element array, and 2a is light emitting. The element 3 is an aspherical lens, and 4 is a cylindrical lens.
【０００９】前記ベースプレート１は透光性を有する絶
縁材料、例えば石英やサファイア、結晶化ガラス、ホウ
ケイ酸ガラス等から成り、その下面には複数個の発光素
子アレイ２やこれら発光素子アレイ２に外部電源からの
電力を供給するための配線導体（図示せず）等が取着さ
れている。The base plate 1 is made of a light-transmitting insulating material, for example, quartz, sapphire, crystallized glass, borosilicate glass, or the like. A wiring conductor (not shown) for supplying power from a power supply is attached.
【００１０】前記複数個の発光素子アレイ２はその各々
が、四角形状を成す多数の発光素子２ａを一定のピッチ
で直線状に配列させて成り、該各発光素子２ａを印画信
号に対応させて個々に選択的に発光させ、該発光した光
（ビーム）を後述するシリンドリカルレンズ４及び非球
面レンズ３を介して外部の感光体面Ｐに照射させること
によって感光体Ｐに所定の潜像を形成する。Each of the plurality of light emitting element arrays 2 is formed by arranging a large number of light emitting elements 2a having a square shape in a straight line at a constant pitch, and making each of the light emitting elements 2a correspond to a printing signal. A predetermined latent image is formed on the photosensitive member P by selectively emitting light individually and irradiating the emitted light (beam) to an external photosensitive member surface P via a cylindrical lens 4 and an aspheric lens 3 described later. .
【００１１】このような発光素子アレイ２は、発光素子
２ａとしてＧａＡｓＰ系、ＧａＡｌＡｓ系のＬＥＤ等を
用い、例えばＧａＡｓＰ系ＬＥＤの場合は、まずＧａＡ
ｓの基板を炉中にて高温に加熱するとともにＡｓＨ
3 （アルシン）とＰＨ3 （ホスヒン）とＧａ（ガリウ
ム）を適量に含むガスを接触させて基板表面にｎ型半導
体のＧａＡｓＰ（ガリウム−砒素−リン）の単結晶を成
長させ、次にＧａＡｓＰ単結晶表面にＳｉ3 Ｈ4 （窒化
珪素）の窓付膜を被着させるとともに該窓部にＺｎ（亜
鉛）のガスをさらし、ｎ型半導体のＧａＡｓＰ単結晶の
一部にＺｎを拡散させてｐ型半導体を形成し、ｐｎ接合
をもたすことによって形成される。The light emitting element array 2 uses a GaAsP-based or GaAlAs-based LED as the light-emitting element 2a. For example, in the case of a GaAsP-based LED, GaAsP-based LED is first used.
s substrate is heated to a high temperature in a furnace and the AsH
3 (arsine), PH 3 (phosphine), and a gas containing an appropriate amount of Ga (gallium) are brought into contact with each other to grow an n-type semiconductor GaAsP (gallium-arsenic-phosphorus) single crystal on the substrate surface. A window with a film of Si 3 H 4 (silicon nitride) is deposited on the crystal surface, and the window is exposed to a gas of Zn (zinc). It is formed by forming a mold semiconductor and having a pn junction.
【００１２】尚、前記発光素子アレイ２はＡ４サイズ、
３００ｄｐｉの光プリンタヘッドを形成する場合、６４
個の発光素子２ａを一単位とした発光素子アレイ２を４
０個、その発光面がベースプレート１の下面と対向する
ようにしてベースプレート１上に配列させ、これらをフ
リップチップ実装すること、具体的には、発光素子アレ
イ２の発光面と同一面に形成される多数の端子電極をベ
ースプレート１上の配線導体に対し半田等のロウ材を介
して電気的・機械的に接続させることによってベースプ
レート１の下面に取着される。The light emitting element array 2 has an A4 size.
When forming a 300 dpi optical printer head, 64
4 light emitting element arrays 2 each having one light emitting element 2a as a unit.
No light emitting surfaces are arranged on the base plate 1 such that the light emitting surface thereof faces the lower surface of the base plate 1, and these are flip-chip mounted, specifically, formed on the same surface as the light emitting surface of the light emitting element array 2. A large number of terminal electrodes are electrically and mechanically connected to wiring conductors on the base plate 1 via a brazing material such as solder to be attached to the lower surface of the base plate 1.
【００１３】一方、前記発光素子アレイ２が配列実装さ
れるベースプレート１の上面側には複数個の非球面レン
ズ３が、該レンズ３と発光素子アレイ２とが１対１に対
応するようにして併設固定されている。On the other hand, a plurality of aspheric lenses 3 are provided on the upper surface side of the base plate 1 on which the light emitting element array 2 is arranged and mounted so that the lenses 3 and the light emitting element arrays 2 correspond one to one. It is attached and fixed.
【００１４】前記複数個の非球面レンズ３は各発光素子
２ａの発する光を所定の倍率で拡大し、これを感光体面
Ｐに照射・結像させるためのものであり、液晶ポリマー
等から成るレンズプレート５等によって支持され、該レ
ンズプレート５の厚み方向に設けられた光透過用の穴５
ａを塞ぐようにしてレンズプレート５上に接着固定され
る。The plurality of aspherical lenses 3 are used to magnify the light emitted from each light emitting element 2a at a predetermined magnification, and to irradiate and form an image on the photoconductor surface P, and are made of a liquid crystal polymer or the like. A light transmitting hole 5 supported by the plate 5 or the like and provided in the thickness direction of the lens plate 5;
a is adhered and fixed on the lens plate 5 so as to cover a.
【００１５】尚、前記非球面レンズ３は、アクリル樹脂
やポリカーボネイト樹脂等の透明樹脂を射出成形した
り、或いはガラス等の透光性無機物を加熱プレス成形す
ることによって所定形状に加工される。The aspherical lens 3 is formed into a predetermined shape by injection molding a transparent resin such as an acrylic resin or a polycarbonate resin, or by hot press molding a transparent inorganic substance such as a glass.
【００１６】また前記ベースプレート１及び複数個の非
球面レンズ３を有するレンズプレート５はハウジング部
材６に固定させることによって各発光素子アレイ２と各
非球面レンズ３とが所定の間隔を隔てて１対１に対応す
るように併設されている。The base plate 1 and a lens plate 5 having a plurality of aspherical lenses 3 are fixed to a housing member 6 so that each light emitting element array 2 and each aspherical lens 3 are separated by a predetermined distance. 1 is provided so as to correspond to 1.
【００１７】前記ハウジング部材６はその上部に第１の
基準面６ａを、下部に第２の基準面６ｂを有しており、
ハウジング部材６の第１基準面６ａにレンズプレート５
の下面外周部を、ハウジング部材６の第２基準面６ｂに
ベースプレート１の上面外周部を各々、当接固定させる
ことによって各発光素子アレイ２と各非球面レンズ３と
は間に所定の距離を隔てて１対１に対応するようになっ
ている。The housing member 6 has a first reference surface 6a at an upper portion thereof and a second reference surface 6b at a lower portion thereof.
The lens plate 5 is provided on the first reference surface 6a of the housing member 6.
By fixing the outer peripheral portion of the lower surface of the base plate 1 to the outer peripheral portion of the base plate 1 on the second reference surface 6b of the housing member 6, a predetermined distance is provided between each light emitting element array 2 and each aspheric lens 3. They correspond to each other on a one-to-one basis.
【００１８】そして前述した各発光素子アレイ２は、図
３に示すように、各発光素子アレイ２の両端域に位置す
る発光素子２ａの長さＬ１（発光素子２ａの配列方向と
直交する方向にかかる寸法）が中央域に位置する発光素
子２ａの長さＬ２よりも長くなるように設定されてお
り、更に、このような発光素子アレイ２と非球面レンズ
３との間には、発光素子２ａの長さに対応させて曲率
（曲率半径の逆数）を変化させた平凸型のシリンドリカ
ルレンズ４が配置されている。As shown in FIG. 3, each of the light emitting element arrays 2 has a length L1 (in a direction perpendicular to the arrangement direction of the light emitting elements 2a) located at both end regions of each light emitting element array 2. (The dimension) is set to be longer than the length L2 of the light emitting element 2a located in the central region. Further, between the light emitting element array 2 and the aspherical lens 3, the light emitting element 2a is provided. A plano-convex cylindrical lens 4 whose curvature (the reciprocal of the radius of curvature) is changed in accordance with the length of the lens is arranged.
【００１９】前記発光素子アレイ２は、例えば、６４個
の発光素子２ａを用いて３００ｄｐｉの線密度で発光素
子アレイ２を形成する場合、中央域に位置する発光素子
２ａの長さＬ２を５０μｍに、また両端域に位置する発
光素子２ａの長さＬ１を５５〜６０μｍの範囲内にそれ
ぞれ設定する。このような発光素子アレイ２の各発光素
子２ａに電流密度を等しくなすようにして電力を印加す
ると、ベースプレート１を介してシリンドリカルレンズ
４に入射する発光素子アレイ２からのビームの長さは各
発光素子２ａの長さに応じてそれぞれ異なる。For example, when the light emitting element array 2 is formed at a line density of 300 dpi using 64 light emitting elements 2a, the length L2 of the light emitting element 2a located in the central region is reduced to 50 μm. Further, the length L1 of the light emitting elements 2a located at both end regions is set within a range of 55 to 60 μm. When power is applied to each light emitting element 2a of such a light emitting element array 2 so as to make the current density equal, the length of the beam from the light emitting element array 2 incident on the cylindrical lens 4 via the base plate 1 becomes equal to each light emission. Each differs depending on the length of the element 2a.
【００２０】また一方、このようなビームが透過するシ
リンドリカルレンズ４は、発光素子２ａからのビームを
シリンドリカルレンズ４の曲率に応じて発光素子２ａの
長さ方向（副走査方向）にのみ集光・縮小させるための
もので、図４に示すように、シリンドリカルレンズ４の
曲率は、発光素子２ａの長さと同様に、その両端部で大
きく、また中央部で小さくなるように変化しているた
め、シリンドリカルレンズ４を透過して非球面レンズ３
に入射する発光素子アレイ２からのビームはその大きさ
を全て等しくなすことができる。しかも、発光素子アレ
イ２からのビームの集光率はその両端域で高くなってい
ることから、該集光したビームの強度も発光素子アレイ
２の両端域で高い。このため、非球面レンズ３の周辺域
を透過するビームの輪郭がレンズ３の収差によって若干
ぼやけたとしても、各発光素子２ａの長さ及びシリンド
リカルレンズ４の曲率を適宜設定しておくことにより、
非球面レンズ３を介して感光体Ｐ上に照射される全ての
ビームの強度、大きさをほぼ等しく揃えることができ、
これによってビームぼけの発生を有効に防止するととも
に、濃度むらの無い良好な印画を形成することが可能と
なる。On the other hand, the cylindrical lens 4 through which such a beam passes condenses the beam from the light emitting element 2a only in the length direction (sub-scanning direction) of the light emitting element 2a in accordance with the curvature of the cylindrical lens 4. As shown in FIG. 4, the curvature of the cylindrical lens 4 changes so as to be larger at both ends and smaller at the center as in the length of the light emitting element 2a, as shown in FIG. Aspherical lens 3 transmitted through cylindrical lens 4
The beams from the light emitting element array 2 incident on the light emitting element can all have the same magnitude. Moreover, since the light collection rate of the beam from the light emitting element array 2 is high at both end areas, the intensity of the condensed beam is also high at both end areas of the light emitting element array 2. For this reason, even if the contour of the beam transmitted through the peripheral area of the aspherical lens 3 is slightly blurred due to the aberration of the lens 3, by appropriately setting the length of each light emitting element 2 a and the curvature of the cylindrical lens 4,
The intensity and magnitude of all the beams irradiated onto the photoconductor P via the aspherical lens 3 can be made almost equal,
As a result, it is possible to effectively prevent the occurrence of beam blur and to form a good print without density unevenness.
【００２１】尚、このような発光素子２ａの長さは、非
球面レンズ３のレンズ特性によって適宜、設定されるも
のであり、例えば、収差による影響が両端に向かって次
第に強く表れる非球面レンズ３の場合には、両端域に位
置する発光素子２ａの長さを両端に向かって２〜５μｍ
ずつ長くなるように設定し、シリンドリカルレンズ４の
曲率もこれに応じて変化させるようにすれば良い。The length of the light emitting element 2a is appropriately set according to the lens characteristics of the aspherical lens 3. For example, the length of the aspherical lens 3a, in which the influence of the aberration gradually appears toward both ends, is increased. In the case of, the length of the light emitting element 2a located at both end regions is 2 to 5 μm toward both ends.
The curvature of the cylindrical lens 4 may be changed accordingly.
【００２２】また、このようなシリンドリカルレンズ４
は、アクリル樹脂やポリカーボネイト樹脂等の透明樹脂
を射出成形したり、或いはガラス等の透光性無機物を加
熱プレス成形することによって所定形状に加工され、更
にこれらを発光素子アレイ２の真上に位置するベースプ
レート１の上面にエポキシ系接着剤，アクリル系接着剤
等を用いて接着固定することによりベースプレート１上
に実装される。このとき、シリンドリカルレンズ４はベ
ースプレート１によって支持されるため、別途レンズプ
レート等を用いる必要はなく、シリンドリカルレンズ４
の位置合わせや光プリンタヘッドの構成が比較的簡単で
ある。Also, such a cylindrical lens 4
Is formed into a predetermined shape by injection molding of a transparent resin such as an acrylic resin or a polycarbonate resin, or by heat press molding of a translucent inorganic material such as glass. The base plate 1 is mounted on the upper surface of the base plate 1 by adhesively fixing the upper surface of the base plate 1 using an epoxy adhesive, an acrylic adhesive, or the like. At this time, since the cylindrical lens 4 is supported by the base plate 1, there is no need to use a separate lens plate or the like.
And the configuration of the optical printer head is relatively simple.
【００２３】かくして上述した光プリンタヘッドは、各
発光素子アレイ２の各発光素子２ａを印画信号に対応さ
せて個々に選択的に発光させるとともに、該発光素子２
ａの発する光（ビーム）をシリンドリカルレンズ４及び
非球面レンズ３を介して外部の感光体Ｐに結像させ、感
光体Ｐに所定の潜像を形成することによって光プリンタ
ヘッドとして機能する。In the optical printer head described above, each light emitting element 2a of each light emitting element array 2 is selectively and individually made to emit light in accordance with a printing signal.
The light (beam) emitted by a is formed on an external photoconductor P via a cylindrical lens 4 and an aspheric lens 3 to form a predetermined latent image on the photoconductor P, thereby functioning as an optical printer head.
【００２４】尚、本発明は上述の実施形態に限定される
ものではなく、本発明の要旨を逸脱しない範囲において
種々の変更、改良等が可能であり、例えば、上述した形
態において隣接する非球面レンズ３間に遮蔽部材７を配
置させても良く、このような遮蔽部材７を用いることに
よって隣接する発光素子アレイ２からのビームによりゴ
ースト像が形成されるのを有効に防止することができ
る。It should be noted that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made without departing from the spirit of the present invention. A shielding member 7 may be arranged between the lenses 3. By using such a shielding member 7, it is possible to effectively prevent a ghost image from being formed by a beam from the adjacent light emitting element array 2.
【００２５】また上述した形態においては発光素子アレ
イとしてＬＥＤアレイを用いたＬＥＤプリンタヘッドを
例に説明したが、ＥＬヘッド、プラズマドットヘッド、
液晶シャッタヘッド、蛍光ヘッド、ＰＬＺＴ等の光プリ
ンタヘッドにも適用可能である。In the above embodiment, an LED printer head using an LED array as a light emitting element array has been described as an example. However, an EL head, a plasma dot head,
The present invention is also applicable to an optical printer head such as a liquid crystal shutter head, a fluorescent head, and a PLZT.
【００２６】[0026]
【発明の効果】本発明の光プリンタヘッドによれば、各
発光素子アレイの両端域に位置する発光素子の長さを中
央域に位置する発光素子よりも長くなし、発光素子アレ
イと非球面レンズとの間に発光素子の長さに対応させて
曲率を変化させたシリンドリカルレンズを配置させたこ
とから、非球面レンズを介して感光体上に照射される全
てのビームの強度、大きさをほぼ等しく揃えることがで
き、これによってビームぼけの発生を有効に防止して濃
度むらの無い良好な印画を形成することが可能となる。According to the optical printer head of the present invention, the length of the light emitting elements located at both end areas of each light emitting element array is not longer than that of the light emitting element located at the center area. Since the cylindrical lens whose curvature is changed according to the length of the light emitting element is arranged between the two, the intensity and magnitude of all the beams irradiated on the photoreceptor via the aspherical lens are almost reduced. It is possible to make them uniform, thereby effectively preventing the occurrence of beam blur and forming a good print without density unevenness.
【図１】本発明の光プリンタヘッドの一形態を示す縦断
面図である。FIG. 1 is a longitudinal sectional view showing one embodiment of an optical printer head of the present invention.
【図２】図１の光プリンタヘッドの横断面図である。FIG. 2 is a cross-sectional view of the optical printer head of FIG.
【図３】発光素子アレイ２を構成する各発光素子２ａの
長さを示した模式図である。FIG. 3 is a schematic diagram showing the length of each light emitting element 2a constituting the light emitting element array 2.
【図４】発光素子アレイ２からのビームがシリンドリカ
ルレンズ４を透過する様子を模式的に示す斜視図であ
る。FIG. 4 is a perspective view schematically showing a state in which a beam from a light emitting element array 2 passes through a cylindrical lens 4.
１・・・ベースプレート ２・・・発光素子アレイ ２ａ・・発光素子 ３・・・非球面レンズ ４・・・シリンドリカルレンズ DESCRIPTION OF SYMBOLS 1 ... Base plate 2 ... Light emitting element array 2a ... Light emitting element 3 ... Aspherical lens 4 ... Cylindrical lens
Claims (1)
線状に配列された発光素子アレイを複数個、列状に配置
させるとともに、これら発光素子アレイ上に該アレイと
１対１に対応する複数個の非球面レンズを配設して成る
光プリンタヘッドであって、 前記各発光素子アレイの両端域に位置する発光素子の長
さを中央域に位置する発光素子よりも長くなし、且つ該
発光素子アレイと前記非球面レンズとの間に前記発光素
子の長さに対応させて曲率を変化させたシリンドリカル
レンズを配置したことを特徴とする光プリンタヘッド。1. A plurality of light emitting element arrays in which a large number of light emitting elements are linearly arranged on a base plate, and a plurality of light emitting element arrays corresponding to the arrays on a one-to-one basis are arranged on the light emitting element arrays. An optical printer head comprising a plurality of aspherical lenses, wherein light emitting elements located at both end areas of each of the light emitting element arrays are not longer than light emitting elements located at a central area, and the light emission An optical printer head, wherein a cylindrical lens having a curvature changed corresponding to the length of the light emitting element is arranged between an element array and the aspherical lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28874896A JP3559402B2 (en) | 1996-10-30 | 1996-10-30 | Optical printer head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28874896A JP3559402B2 (en) | 1996-10-30 | 1996-10-30 | Optical printer head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10129035A true JPH10129035A (en) | 1998-05-19 |
| JP3559402B2 JP3559402B2 (en) | 2004-09-02 |
Family
ID=17734198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28874896A Expired - Fee Related JP3559402B2 (en) | 1996-10-30 | 1996-10-30 | Optical printer head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3559402B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008107619A (en) * | 2006-10-26 | 2008-05-08 | Seiko Epson Corp | Line head and image forming apparatus using the same |
| US7719560B2 (en) * | 2006-10-26 | 2010-05-18 | Seiko Epson Corporation | Line head and imaging apparatus incorporating the same |
-
1996
- 1996-10-30 JP JP28874896A patent/JP3559402B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008107619A (en) * | 2006-10-26 | 2008-05-08 | Seiko Epson Corp | Line head and image forming apparatus using the same |
| US7719560B2 (en) * | 2006-10-26 | 2010-05-18 | Seiko Epson Corporation | Line head and imaging apparatus incorporating the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3559402B2 (en) | 2004-09-02 |
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