JPH0588517A - Led head - Google Patents
Led headInfo
- Publication number
- JPH0588517A JPH0588517A JP25003691A JP25003691A JPH0588517A JP H0588517 A JPH0588517 A JP H0588517A JP 25003691 A JP25003691 A JP 25003691A JP 25003691 A JP25003691 A JP 25003691A JP H0588517 A JPH0588517 A JP H0588517A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting element
- circuit board
- photosensitive drum
- led head
- 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.)
- Pending
Links
Landscapes
- Dot-Matrix Printers And Others (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Led Device Packages (AREA)
- Led Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、発光素子列からの照
射光を、収束用レンズで感光ドラムの位置に収束させ
て、必要なドットを形成するＬＥＤヘッドに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED head for forming necessary dots by converging light emitted from a light emitting element array to a position of a photosensitive drum by a converging lens.
【０００２】[0002]
【従来の技術】ＬＥＤヘッドは、発光素子からの照射光
を感光ドラムの位置に収束させて必要なドットを形成す
るので、照射光の焦点の位置に感光ドラムが設置される
ことが極めて重要である。その為の機構として、従来よ
り種々のものが提案されており、図４は、そのような機
構を有する印字装置の一例を図示したものである。この
装置は、発光素子列を搭載する回路基板２１と、発光素
子からの照射光を収束させるレンズ列２２と、このレン
ズ列２２を発光素子から所定距離隔てて固着するヘッド
カバー２３と、回路基板２１の発熱を放熱する放熱板２
４と、この放熱板２４と感光ドラム２５間との距離を一
定値に定める焦点合わせ機構２６とで構成されている。2. Description of the Related Art Since an LED head converges the irradiation light from a light emitting element to the position of the photosensitive drum to form a required dot, it is extremely important to install the photosensitive drum at the focal point of the irradiation light. is there. Various mechanisms have been conventionally proposed for this purpose, and FIG. 4 shows an example of a printer having such a mechanism. This device includes a circuit board 21 on which a light emitting element array is mounted, a lens array 22 that converges light emitted from the light emitting element, a head cover 23 that fixes the lens array 22 at a predetermined distance from the light emitting element, and a circuit board 21. Radiator plate 2 that dissipates the heat generated by
4 and a focusing mechanism 26 that sets the distance between the heat sink 24 and the photosensitive drum 25 to a constant value.
【０００３】焦点合わせ機構２６は、放熱板２４に立設
する柱棒２７と、感光ドラム２５側からの先端に凹部２
９を有する柱棒２８とで構成されており、柱棒２７と柱
棒２８の接する位置において、ＬＥＤヘッドと感光ドラ
ム２５の位置合わせをしている。また、図５は、別の焦
点合わせ機構を有する印字装置を図示したものであり、
発光素子列を搭載する回路基板２１と、発光素子からの
照射光を収束させるレンズ列２２と、このレンズ列２２
を発光素子から所定距離隔てて固着するヘッドカバー２
３と、回路基板２１の発熱を放熱する放熱板２４と、焦
点合わせ機構２６とで構成されている。そして、この装
置では、ヘッドカバー２３の先端部に凹部３０を設け、
感光ドラム側に柱棒２８を設けて焦点合わせ機構２６を
構成し、柱棒２８の先端を凹部３０に接触させることで
ＬＥＤヘッドと感光ドラム２５の位置決めを行ってい
る。The focusing mechanism 26 includes a column bar 27 standing on the heat dissipation plate 24 and a recess 2 at the tip from the photosensitive drum 25 side.
9 and a column bar 28 having 9 and the LED head and the photosensitive drum 25 are aligned at the position where the column bar 27 and the column bar 28 contact each other. Further, FIG. 5 illustrates a printer having another focusing mechanism,
A circuit board 21 on which the light emitting element array is mounted, a lens array 22 for converging light emitted from the light emitting element, and the lens array 22.
Head cover 2 for fixing the light source at a predetermined distance from the light emitting element
3, a heat dissipation plate 24 that dissipates heat generated by the circuit board 21, and a focusing mechanism 26. In this device, the recess 30 is provided at the tip of the head cover 23,
The columnar rod 28 is provided on the photosensitive drum side to configure the focusing mechanism 26, and the tip of the columnar rod 28 is brought into contact with the recess 30 to position the LED head and the photosensitive drum 25.
【０００４】[0004]
【発明が解決しようとする課題】しかし、感光ドラムと
の距離を定める基準面は、図４のものは放熱板であり、
図５のものはヘッドカバーであり、いずれの装置におい
ても、発光素子の搭載されていない部材が基準面とな
る。その為、焦点合わせ機構をいかに精密に構築して
も、基準面となる部材の厚みのバラツキのために、発光
素子と受光面の正確な焦点合わせが出来ないという問題
点がある。However, as the reference plane for determining the distance from the photosensitive drum, the one shown in FIG.
The head cover is shown in FIG. 5, and in any of the devices, the member on which the light emitting element is not mounted serves as the reference surface. Therefore, no matter how precisely the focusing mechanism is constructed, there is a problem in that the light emitting element and the light receiving surface cannot be accurately focused due to the variation in the thickness of the member serving as the reference surface.
【０００５】この発明は、この問題点に着目してなされ
たものであって、正確に焦点合わせをすることができる
ＬＥＤヘッドを提供することを目的とする。The present invention has been made in view of this problem, and an object thereof is to provide an LED head capable of performing accurate focusing.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成する
為、この発明に係るＬＥＤヘッドは、発光素子列を搭載
する回路基板と、この発光素子の照射光を収束させるレ
ンズ列と、このレンズ列を前記発光素子と所定距離隔て
て固着するヘッドカバーとを備えるＬＥＤヘッドにおい
て、前記ヘッドカバーの端部から、前記回路基板を長手
方向に所定距離だけ延設すると共に、その延設箇所に感
光ドラムと前記発光素子列との距離を定める基準点を設
けている。In order to achieve the above object, an LED head according to the present invention includes a circuit board on which a light emitting element array is mounted, a lens array for converging light emitted from the light emitting element, and the lens. In an LED head including a head cover for fixing a row to the light emitting elements at a predetermined distance, the circuit board is extended from the end portion of the head cover by a predetermined distance in the longitudinal direction, and a photosensitive drum is provided at the extended portion. A reference point that determines the distance from the light emitting element array is provided.
【０００７】[0007]
【作用】回路基板は、長手方向にヘッドカバーの端部に
対し所定距離だけ延設されており、また、その延設箇所
には、感光ドラムと前記発光素子列との距離を定める基
準点が設けられている。従って、この基準点に基づいて
感光ドラムとＬＥＤヘッドの位置決めをすれば、発光素
子と感光ドラムの距離は常に所定の値となり、従って、
正確に焦点合わせができる。The circuit board is extended in the longitudinal direction by a predetermined distance from the end of the head cover, and a reference point that determines the distance between the photosensitive drum and the light emitting element array is provided at the extended portion. Has been. Therefore, if the photosensitive drum and the LED head are positioned on the basis of this reference point, the distance between the light emitting element and the photosensitive drum will always be a predetermined value.
You can focus accurately.
【０００８】[0008]
【実施例】以下実施例に基づいて更に詳細に説明する。
図１、図２は、この発明に係るＬＥＤヘッドの一実施例
を示す概略図である。このＬＥＤヘッドは、多数の発光
素子１をライン状に搭載する回路基板２と、各発光素子
１よりの照射光を収束させるレンズ列３と、レンズ列３
を発光素子１より所定距離隔てて固着するヘッドカバー
４と、回路基板２よりの発熱を放熱する放熱板５とで構
成されている（図１、図２参照）。そして、回路基板２
は、放熱板５の位置より長手方向にさらに延設されてお
り、その延設箇所には、貫通穴２-1が設けられている。Embodiments will be described in more detail with reference to the following embodiments.
1 and 2 are schematic views showing an embodiment of the LED head according to the present invention. This LED head includes a circuit board 2 on which a large number of light emitting elements 1 are mounted in a line, a lens array 3 for converging light emitted from each light emitting element 1, and a lens array 3.
And a heat radiating plate 5 for radiating heat generated from the circuit board 2 (see FIGS. 1 and 2). And the circuit board 2
Is further extended in the longitudinal direction from the position of the heat radiating plate 5, and a through hole 2 -1 is provided in the extended portion.
【０００９】回路基板２上の貫通穴２-1は、焦点合わせ
用部材を装着する為のものであり、柱棒６の先端は、回
路基板２の貫通穴２-1に挿着され、その挿着点を基準に
してＬＥＤヘッドと感光ドラム７の位置合わせ（焦点合
わせ）が行われる。以上の通り、回路基板２と感光ドラ
ム７の距離は、焦点合わせ部材としての柱棒６によって
所定値となるように設定されるので、各発光素子１から
の照射光は、感光ドラム７の位置に正確に収束する。す
なわち、図２の矢印に示す通り、発光素子１より照射さ
れる照射光は、収束用レンズ３の作用によって、感光ド
ラム７の位置に正確に収束される。The through hole 2 -1 on the circuit board 2 is for mounting a focusing member, and the tip of the column bar 6 is inserted into the through hole 2 -1 of the circuit board 2 and The LED head and the photosensitive drum 7 are aligned (focused) with the insertion point as a reference. As described above, the distance between the circuit board 2 and the photosensitive drum 7 is set to be a predetermined value by the column bar 6 as a focusing member, so that the irradiation light from each light emitting element 1 is located at the position of the photosensitive drum 7. Converge to exactly. That is, as shown by the arrow in FIG. 2, the irradiation light emitted from the light emitting element 1 is accurately converged on the position of the photosensitive drum 7 by the action of the converging lens 3.
【００１０】図３は、別の実施例であるＬＥＤヘッドに
ついて、回路基板に設けられた貫通穴２-1の付近を示し
た斜視図である。この斜視図には、回路基板２と、レン
ズ列３と、これらを覆う放熱板５とが示されている。こ
の装置でも、柱棒の先端が回路基板２の貫通穴２-1に挿
着され、その挿着点を基準にしてＬＥＤヘッドと感光ド
ラムの位置合わせ（焦点合わせ）が行われる。尚、図３
においてレンズ列３と放熱板５と回路基板２とは、それ
ぞれ接着用樹脂８で接着されている。FIG. 3 is a perspective view showing the vicinity of the through hole 2 -1 provided in the circuit board in the LED head according to another embodiment. In this perspective view, a circuit board 2, a lens array 3, and a heat dissipation plate 5 that covers them are shown. Also in this apparatus, the tip of the column bar is inserted into the through hole 2 -1 of the circuit board 2, and the LED head and the photosensitive drum are aligned (focused) with reference to the insertion point. Incidentally, FIG.
In FIG. 3, the lens array 3, the heat sink 5 and the circuit board 2 are adhered to each other with an adhesive resin 8.
【００１１】なお、本願発明は、回路基板の延設部分の
上面を位置合わせの基準点とすることを特徴とするもの
であり、焦点合わせ機構自体は、図１、図２の実施例の
ものに限定されるものではない。また、図１、図２の実
施例では回路基板の下面に放熱板が設けられた場合を説
明しているが、本願発明はこれに限定されるものではな
く、例えばヘッドカバーと放熱板が兼用されるもの等に
も適用できる。The present invention is characterized in that the upper surface of the extended portion of the circuit board is used as a reference point for alignment, and the focusing mechanism itself is that of the embodiment shown in FIGS. 1 and 2. It is not limited to. Further, although the embodiments of FIGS. 1 and 2 describe the case where the heat dissipation plate is provided on the lower surface of the circuit board, the present invention is not limited to this, and for example, the head cover and the heat dissipation plate are combined. It can also be applied to things.
【００１２】[0012]
【発明の効果】以上説明したように、この発明に係るＬ
ＥＤヘッドでは、回路基板と感光ドラムの距離を常に一
定にすることができ、発光素子からの照射光の焦点合わ
せの精度を上げることができる。また、焦点合わせの為
に複雑な機構は不要であり、従って、安価で良質な印字
装置を構築することができる。As described above, the L according to the present invention is
In the ED head, the distance between the circuit board and the photosensitive drum can always be made constant, and the accuracy of focusing the irradiation light from the light emitting element can be improved. In addition, a complicated mechanism is not required for focusing, so that an inexpensive and high-quality printing device can be constructed.
【図１】この発明の一実施例を示す概略図である。FIG. 1 is a schematic view showing an embodiment of the present invention.
【図２】図１の装置において照射光が収束する様子を図
示したものである。FIG. 2 illustrates how the irradiation light converges in the apparatus of FIG.
【図３】この発明の別の実施例を示す斜視図である。FIG. 3 is a perspective view showing another embodiment of the present invention.
【図４】従来の焦点合わせ機構の一例を図示したもので
ある。FIG. 4 illustrates an example of a conventional focusing mechanism.
【図５】従来の焦点合わせ機構の別の一例を図示したも
のである。FIG. 5 illustrates another example of a conventional focusing mechanism.
１ 発光素子 ２ 回路基板 ２-1 位置決め用貫通穴（基準点） ３ レンズ列 ４ ヘッドカバー1 Light emitting element 2 Circuit board 2 -1 Positioning through hole (reference point) 3 Lens row 4 Head cover
フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０２Ｂ 27/18 Ａ 9120−2Ｋ Ｈ０１Ｌ 33/00 Ｍ 8934−4Ｍ Continuation of front page (51) Int.Cl. 5 Identification number Office reference number FI technical display location G02B 27/18 A 9120-2K H01L 33/00 M 8934-4M
Claims (1)
光素子の照射光を収束させるレンズ列と、このレンズ列
を前記発光素子と所定距離隔てて固着するヘッドカバー
とを備えるＬＥＤヘッドにおいて、 前記ヘッドカバーの端部から、前記回路基板を長手方向
に所定距離だけ延設すると共に、その延設箇所に感光ド
ラムと前記発光素子列との距離を定める基準点を設ける
ことを特徴とするＬＥＤヘッド。1. An LED head comprising a circuit board on which a light emitting element array is mounted, a lens array for converging light emitted from the light emitting element, and a head cover for fixing the lens array to the light emitting element at a predetermined distance. The LED head is characterized in that the circuit board is extended in the longitudinal direction by a predetermined distance from the end portion of the head cover, and a reference point that determines the distance between the photosensitive drum and the light emitting element array is provided at the extended portion. ..
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25003691A JPH0588517A (en) | 1991-09-30 | 1991-09-30 | Led head |
| US07/929,009 US5506612A (en) | 1991-09-30 | 1992-08-13 | LED head |
| KR1019920017665A KR100243426B1 (en) | 1991-09-30 | 1992-09-28 | Led head and printer using it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25003691A JPH0588517A (en) | 1991-09-30 | 1991-09-30 | Led head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0588517A true JPH0588517A (en) | 1993-04-09 |
Family
ID=17201877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25003691A Pending JPH0588517A (en) | 1991-09-30 | 1991-09-30 | Led head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0588517A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59155140U (en) * | 1983-04-06 | 1984-10-18 | 沖電気工業株式会社 | Assembly structure of optical print head |
| JPS62231969A (en) * | 1986-04-01 | 1987-10-12 | Fuji Xerox Co Ltd | Optical writing device |
| JPS63161740U (en) * | 1987-04-06 | 1988-10-21 | ||
| JPH0210548U (en) * | 1988-06-30 | 1990-01-23 | ||
| JPH0278579A (en) * | 1988-09-14 | 1990-03-19 | Canon Inc | Optical printer |
| JPH02140762A (en) * | 1988-11-21 | 1990-05-30 | Canon Inc | Optical printer |
| JPH0333870A (en) * | 1989-06-30 | 1991-02-14 | Canon Inc | Image forming device |
-
1991
- 1991-09-30 JP JP25003691A patent/JPH0588517A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59155140U (en) * | 1983-04-06 | 1984-10-18 | 沖電気工業株式会社 | Assembly structure of optical print head |
| JPS62231969A (en) * | 1986-04-01 | 1987-10-12 | Fuji Xerox Co Ltd | Optical writing device |
| JPS63161740U (en) * | 1987-04-06 | 1988-10-21 | ||
| JPH0210548U (en) * | 1988-06-30 | 1990-01-23 | ||
| JPH0278579A (en) * | 1988-09-14 | 1990-03-19 | Canon Inc | Optical printer |
| JPH02140762A (en) * | 1988-11-21 | 1990-05-30 | Canon Inc | Optical printer |
| JPH0333870A (en) * | 1989-06-30 | 1991-02-14 | Canon Inc | Image forming device |
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