JP4984701B2 - Manufacturing method of LED print head - Google Patents

Manufacturing method of LED print head Download PDF

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JP4984701B2
JP4984701B2 JP2006195200A JP2006195200A JP4984701B2 JP 4984701 B2 JP4984701 B2 JP 4984701B2 JP 2006195200 A JP2006195200 A JP 2006195200A JP 2006195200 A JP2006195200 A JP 2006195200A JP 4984701 B2 JP4984701 B2 JP 4984701B2
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lens array
rank
print head
value
conjugate length
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JP2008023720A (en
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節男 鈴木
正史 清水
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
Fujifilm Business Innovation Corp
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Description

本発明は、複写機、プリンタ等の画像形成装置で用いられるLEDプリントヘッドの製造方法に関する。   The present invention relates to a method for manufacturing an LED print head used in an image forming apparatus such as a copying machine or a printer.

従来より、画像形成装置の感光体ドラム等の静電潜像担持体に画像の静電潜像を形成するために、LED素子とレンズアレイを主要な構成要素とするLEDプリントヘッドが用いられている。   Conventionally, in order to form an electrostatic latent image of an image on an electrostatic latent image carrier such as a photosensitive drum of an image forming apparatus, an LED print head including an LED element and a lens array as main components has been used. Yes.

レンズアレイは、2枚の平板の間に複数の長尺状のロッドレンズを直線状または千鳥状に配列させ、ゴム状の樹脂により固定したものを切断して製造するものである(例えば、特許文献3の図6、特許文献4の図3参照)。   The lens array is manufactured by arranging a plurality of long rod lenses between two flat plates in a linear or zigzag manner and fixing them with a rubber-like resin (for example, patents). (See FIG. 6 of Document 3 and FIG. 3 of Patent Document 4).

このため、レンズアレイは、ロッドレンズ毎の光学特性のばらつきが原因で、共役長TC(TC値)にばらつきが生じるという問題がある。ここで、TCとは、Total Conjugate Lengthを略したものであり、物体像面間距離のことである。   For this reason, the lens array has a problem that the conjugate length TC (TC value) varies due to variations in the optical characteristics of the rod lenses. Here, TC is an abbreviation of Total Conjugate Length, and is a distance between object image planes.

かかる問題を改善し、TC値のばらつきを極力小さくし、TC値を略一定にするために、ロッドレンズの光学特性に合わせて、一定の割合でレンズアレイの切断寸法(光軸方向の高さ寸法)を変化させることが一般に行われている。   In order to improve such a problem, to minimize variations in the TC value, and to make the TC value substantially constant, the cut size of the lens array (the height in the optical axis direction) is fixed at a constant rate in accordance with the optical characteristics of the rod lens. It is common practice to change the dimensions.

そして、レンズアレイは、LED素子の発光点と、レンズアレイの中心点の距離がTC値の1/2(共役長中心)になる位置に位置決め固定され、LEDプリントヘッドが製造されている(例えば、特許文献1〜3参照)。   The lens array is positioned and fixed at a position where the distance between the light emitting point of the LED element and the center point of the lens array is 1/2 of the TC value (conjugate length center), and the LED print head is manufactured (for example, Patent Documents 1 to 3).

特開平05−138934号公報JP 05-138934 A 特開2003−251858号公報Japanese Patent Laid-Open No. 2003-251858 特開平06−059101号公報Japanese Patent Laid-Open No. 06-059101 特開平06−347608号公報Japanese Patent Laid-Open No. 06-347608

しかし、レンズアレイの光軸方向の高さ寸法は、レンズアレイのロット毎にまちまちなので、レンズアレイをベースに位置決めする際に、レンズアレイのロット毎にレンズアレイの光軸方向の高さ寸法を測定し、この測定値からレンズアレイをベースに固定するための位置を算出しなければならないという問題があった。   However, the height dimension of the lens array in the optical axis direction varies depending on the lot of lens arrays. Therefore, when positioning the lens array on the base, the height dimension of the lens array in the optical axis direction is determined for each lot of lens arrays. There is a problem that the position for fixing the lens array to the base must be calculated from the measured values.

このため、LEDプリントヘッドの組立工数の増加を招き、LEDプリントヘッドのコストアップの一因となっていた。   For this reason, an increase in the man-hours for assembling the LED print head is caused, which is a cause of an increase in cost of the LED print head.

本発明は、かかる問題を解決するためになされたものであり、レンズアレイの光軸方向の高さ寸法を一定にすることにより、製造工程を簡略化したLEDプリントヘッドの製造方法を提供するものである。   The present invention has been made to solve such a problem, and provides a method of manufacturing an LED print head that simplifies the manufacturing process by making the height dimension of the lens array in the optical axis direction constant. It is.

本発明は、複数のLED素子を実装した基板と、該基板を固定したベースと、前記LED素子からの光を透過するレンズアレイとを備えたLEDプリントヘッドの製造方法に関するものである。   The present invention relates to a method of manufacturing an LED print head including a substrate on which a plurality of LED elements are mounted, a base on which the substrate is fixed, and a lens array that transmits light from the LED elements.

まず、光軸方向の高さ寸法を一定にして切断した複数のレンズアレイを製造して準備を行う。そして、光軸方向の高さ寸法を一定にした全てのレンズアレイについて、共役長TCを測定し、この共役長TCの測定値に基づいて、全てのレンズアレイを数ランクに分け、各ランクごとに共役長TCの中央値を算出する。   First, a plurality of lens arrays cut with a constant height in the optical axis direction are manufactured and prepared. Then, the conjugate length TC is measured for all lens arrays having a constant height in the optical axis direction, and all the lens arrays are divided into several ranks based on the measured value of the conjugate length TC. The median of the conjugate length TC is calculated.

そして、所定のランクに属するレンズアレイ群を選択し、選択したレンズアレイ群の光軸方向の高さ寸法の中心と、LED素子との距離が、所定のランクの共役長TCの中央値の1/2となるように、選択されたレンズアレイ群に属する1つのレンズアレイをベースに固定する。   Then, a lens array group belonging to a predetermined rank is selected, and the distance between the center of the height dimension of the selected lens array group in the optical axis direction and the LED element is 1 as the median value of the conjugate length TC of the predetermined rank. One lens array belonging to the selected lens array group is fixed to the base so as to be / 2.

本発明により、レンズアレイをベースに位置決め固定する際に、レンズアレイの光軸方向の高さ寸法の測定、位置計算をする工程を無くすことができる。このため、低コストでLEDプリントヘッドを製造できるという効果を奏する。   According to the present invention, when the lens array is positioned and fixed to the base, the steps of measuring the height dimension of the lens array in the optical axis direction and calculating the position can be eliminated. For this reason, there exists an effect that an LED print head can be manufactured at low cost.

以下に実施例を用いて、本発明を詳細に説明する。   Hereinafter, the present invention will be described in detail using examples.

本発明に係る第1実施例を、図1乃至図2を用いて説明する。
図1はレンズアレイの側面図、図2はLEDプリントヘッドの側面図である。
A first embodiment according to the present invention will be described with reference to FIGS.
FIG. 1 is a side view of a lens array, and FIG. 2 is a side view of an LED print head.

(レンズアレイの準備)
まず、図1に示すように、レンズアレイ1を構成するロッドレンズの光学特性にかかわらず、レンズアレイ1の光軸方向の高さ寸法Tを一定にしたレンズアレイ1を公知の方法により製造する。本実施例においては、T=4.3mmとした。
(Preparation of lens array)
First, as shown in FIG. 1, a lens array 1 having a constant height dimension T in the optical axis direction of the lens array 1 is manufactured by a known method regardless of the optical characteristics of the rod lenses constituting the lens array 1. . In this embodiment, T = 4.3 mm.

(共役長TCの測定)
そして、上記の方法により製造したレンズアレイ1の全てについて、共役長TC(TC値)を測定する。
(Measurement of conjugate length TC)
And conjugate length TC (TC value) is measured about all the lens arrays 1 manufactured by said method.

(ランク分け)
全てのレンズアレイ1についてのTC値のデータが揃ったら、例えば、次の6ランクにレンズアレイ1を分類する。
ランク1 ・・・ 9.72mm≦TC値< 9.80mm
ランク2 ・・・ 9.80mm≦TC値< 9.88mm
ランク3 ・・・ 9.88mm≦TC値< 9.96mm
ランク4 ・・・ 9.96mm≦TC値<10.04mm
ランク5 ・・・ 10.04mm≦TC値<10.12mm
ランク6 ・・・ 10.12mm≦TC値<10.20mm
(Ranking)
When the TC value data for all the lens arrays 1 are obtained, for example, the lens arrays 1 are classified into the following six ranks.
Rank 1 ... 9.72 mm ≤ TC value <9.80 mm
Rank 2 ... 9.80 mm ≤ TC value <9.88 mm
Rank 3 ... 9.88 mm ≤ TC value <9.96 mm
Rank 4 ... 9.96 mm ≤ TC value <10.04 mm
Rank 5 ... 10.04 mm ≤ TC value <10.12 mm
Rank 6 ... 10.12 mm ≤ TC value <10.20 mm

(共役長TCの中央値の算出)
次に、各ランクのTC値の中央値(メジアン)を算出する。前記した6ランクに分類した場合は、ランク1のTC値の中央値は、(9.72mm+9.80mm)/2=9.76mmとなる。同様に計算すると、ランク2は9.84mm、ランク3は9.92mm、ランク4は10.00mm、ランク5は10.08mm、ランク6は10.16mmとなる。
(Calculation of median conjugate length TC)
Next, the median (median) of the TC values of each rank is calculated. When classified into the above-mentioned six ranks, the median value of rank 1 TC values is (9.72 mm + 9.80 mm) /2=9.76 mm. Similarly, rank 2 is 9.84 mm, rank 3 is 9.92 mm, rank 4 is 10.00 mm, rank 5 is 10.08 mm, and rank 6 is 10.16 mm.

(LEDプリントヘッドの製造)
そして、LEDプリントヘッドの製造に使用するレンズアレイ群を選択する。
例えば、ランク3に分類されたレンズアレイ1が100本あった場合は、ランク3のTC値の中央値は9.92mmであるから、この100本を、図2におけるTC値/2=4.96mmとなるように、ベース1に位置決め固定する。
(Manufacture of LED print heads)
Then, a lens array group used for manufacturing the LED print head is selected.
For example, when there are 100 lens arrays 1 classified into rank 3, the median value of TC values of rank 3 is 9.92 mm. Therefore, these 100 are converted to TC value / 2 = 4.4 in FIG. Positioning and fixing to the base 1 so as to be 96 mm.

つまり、100本の中から任意に取り出した1本のレンズアレイ1を、レンズアレイ1の光軸方向の高さ寸法Tの中心と、LED素子3との距離が4.96mmとなるように、ベース2に対して位置決めし、接着剤等で固定する。   That is, the lens array 1 arbitrarily taken out from the 100 lenses is arranged such that the distance between the center of the height dimension T in the optical axis direction of the lens array 1 and the LED element 3 is 4.96 mm. Position with respect to the base 2 and fix with an adhesive or the like.

言うまでもなく、他の99本のレンズアレイ1についても、図2におけるTC/2=4.96mmとなるように、ベース1に位置決め固定する。
また、ランク3に属するレンズアレイ群を使い切った場合は、他のランクに属するレンズアレイを用いてLEDプリントヘッド4を製造する。例えば、ランク2に属するレンズアレイ群を用いてLEDプリントヘッド4を製造する場合は、図2におけるTC/2=4.84mmとなるように、ベース1に位置決め固定する。
Needless to say, the other 99 lens arrays 1 are also positioned and fixed to the base 1 such that TC / 2 = 4.96 mm in FIG.
Further, when the lens array group belonging to rank 3 is used up, the LED print head 4 is manufactured using a lens array belonging to another rank. For example, when the LED print head 4 is manufactured using a lens array group belonging to rank 2, it is positioned and fixed to the base 1 so that TC / 2 in FIG. 2 = 4.84 mm.

以上のように、本発明のLEDプリントヘッドの製造方法を用いることにより、従来行っていたレンズアレイ1の光軸方向の高さ寸法Tの測定、この測定値に基づくレンズアレイ1の位置決め座標の計算という工程を排除することができる。したがって、LEDプリントヘッドの工程を簡略化でき、製造時間の短縮ができるので、LEDプリントヘッドのコストダウンを図ることができる。   As described above, by using the manufacturing method of the LED print head of the present invention, the conventional measurement of the height dimension T of the lens array 1 in the optical axis direction and the positioning coordinates of the lens array 1 based on this measurement value The calculation process can be eliminated. Therefore, the process of the LED print head can be simplified and the manufacturing time can be shortened, so that the cost of the LED print head can be reduced.

本発明に係る第2実施例を以下に説明する。
尚、第1実施例との相違点のみ説明し、第1実施例と同一の部分については、説明を省略する。
A second embodiment according to the present invention will be described below.
Only differences from the first embodiment will be described, and description of the same parts as those of the first embodiment will be omitted.

第1実施例との相違点は、レンズアレイの分類ランクを4ランクにし、各ランクのTC値の幅を変化させた点のみである。   The difference from the first embodiment is only that the classification rank of the lens array is set to 4 ranks and the width of the TC value of each rank is changed.

(ランク分け)
全てのレンズアレイについてのTC値のデータを測定した後、次の4ランクにレンズアレイを分類する。
ランク1 ・・・ 9.72mm≦TC値< 9.80mm
ランク2 ・・・ 9.80mm≦TC値< 9.96mm
ランク3 ・・・ 9.96mm≦TC値<10.12mm
ランク4 ・・・ 10.12mm≦TC値<10.20mm
すなわち、ランク1およびランク4のTC値の幅を0.16mmとし、ランク2およびランク3のTC値の幅を0.08mmとした。
(Ranking)
After measuring TC value data for all lens arrays, the lens arrays are classified into the following four ranks.
Rank 1 ... 9.72 mm ≤ TC value <9.80 mm
Rank 2 ... 9.80 mm ≤ TC value <9.96 mm
Rank 3 ... 9.96 mm ≤ TC value <10.12 mm
Rank 4 ... 10.12 mm ≤ TC value <10.20 mm
That is, the TC value width of rank 1 and rank 4 was 0.16 mm, and the TC value width of rank 2 and rank 3 was 0.08 mm.

(共役長TCの中央値の算出)
この場合、各ランクのTC値の中央値は、ランク1のTC値の中央値は、(9.72mm+9.80mm)/2=9.76mmとなり、ランク2は9.88mm、ランク3は10.04mm、ランク4は10.16mmとなる。
(Calculation of median conjugate length TC)
In this case, the median of the TC values of each rank is (9.72 mm + 9.80 mm) /2=9.76 mm, the rank 2 is 9.88 mm, and the rank 3 is 10.8 mm. 04 mm, rank 4 is 10.16 mm.

上記のようにしても、実施例1と同じ効果を得ることができる。   Even if it does as mentioned above, the same effect as Example 1 can be acquired.

上述の実施例は、説明のために例示したもので、本発明としてそれに限定されるものではなく、特許請求の範囲、発明の詳細な説明、及び図面の記載から当事者が認識する事ができる本発明の技術的思想に反しない限り、変更および付加が可能である。   The above-described embodiments are merely illustrative and are not intended to limit the present invention. The present invention can be recognized by those skilled in the art from the claims, the detailed description of the invention, and the drawings. Modifications and additions can be made without departing from the technical idea of the invention.

例えば、前記した実施例は、TC値のランク幅が全て同一または2つが同一のものを示したが、TC値のランク幅が全て異なっていても良い。   For example, in the above-described embodiments, the rank widths of the TC values are all the same or the two are the same, but the rank widths of the TC values may be all different.

本発明は、画像形成装置に用いられるLEDプリントヘッドの製造方法に適用される。   The present invention is applied to a manufacturing method of an LED print head used in an image forming apparatus.

レンズアレイの側面図である(実施例1)(Example 1) which is a side view of a lens array. LEDプリントヘッドの側面図である(実施例1)(Example 1) which is a side view of an LED print head.

符号の説明Explanation of symbols

1 レンズアレイ
2 ベース
3 LED素子
4 LEDプリントヘッド
5 基板
DESCRIPTION OF SYMBOLS 1 Lens array 2 Base 3 LED element 4 LED print head 5 Board | substrate

Claims (1)

複数のLED素子を実装した基板と、該基板を固定したベースと、前記LED素子からの光を透過するレンズアレイとを備えたLEDプリントヘッドの製造方法において、
共役長TCにかかわらず、光軸方向の高さ寸法を一定にして製造した複数のレンズアレイを準備し、
各レンズアレイについて、共役長TCを測定し、
該共役長TCの測定値に基づいて、複数の前記レンズアレイを数ランクに分け、
各ランクごとに共役長TCの中央値を算出し、
所定のランクに属する前記レンズアレイ群を選択し、
該選択したレンズアレイ群の光軸方向の高さ方向の中心と、前記LED素子との距離が、前記所定のランクの共役長TCの前記中央値の1/2となるように、前記ベースに対して前記選択されたレンズアレイ群に属する1つの前記レンズアレイを固定したことを特徴とするLEDプリントヘッドの製造方法。
In a method of manufacturing an LED print head comprising a substrate on which a plurality of LED elements are mounted, a base on which the substrate is fixed, and a lens array that transmits light from the LED elements,
Regardless of the conjugate length TC, preparing a plurality of lens arrays manufactured with a constant height dimension in the optical axis direction,
For each lens array, measure the conjugate length TC,
Based on the measured value of the conjugate length TC , the plurality of lens arrays are divided into several ranks,
Calculate the median of the conjugate length TC for each rank,
Select the lens array group belonging to a predetermined rank,
In the base, the distance between the center of the selected lens array group in the height direction in the optical axis direction and the LED element is ½ of the median value of the conjugate length TC of the predetermined rank. An LED print head manufacturing method, wherein one lens array belonging to the selected lens array group is fixed.
JP2006195200A 2006-07-18 2006-07-18 Manufacturing method of LED print head Expired - Fee Related JP4984701B2 (en)

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