JPH098345A - Light emitting diode array chip - Google Patents

Light emitting diode array chip

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Publication number
JPH098345A
JPH098345A JP15464295A JP15464295A JPH098345A JP H098345 A JPH098345 A JP H098345A JP 15464295 A JP15464295 A JP 15464295A JP 15464295 A JP15464295 A JP 15464295A JP H098345 A JPH098345 A JP H098345A
Authority
JP
Japan
Prior art keywords
light emitting
led array
array chip
chip
glass
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
Application number
JP15464295A
Other languages
Japanese (ja)
Inventor
Ryosaku Kanzawa
亮策 神沢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Cable Ltd
Original Assignee
Hitachi Cable Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Cable Ltd filed Critical Hitachi Cable Ltd
Priority to JP15464295A priority Critical patent/JPH098345A/en
Publication of JPH098345A publication Critical patent/JPH098345A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To prevent short circuit between chips by arranging a plurality of light emitting diodes linearly on a semiconductor substrate and forming insulating parts at the opposite ends in the arranging direction of light emission diode array chip provided with a lead-out electrode. CONSTITUTION: A wafer 1 is coated with silica coating glass and dried thus forming a glass film 4. The wafer 1 is cut off at each scribe area 2. At that time, glass 4a is left at the opposite ends of a substrate 5 for an LED array chip. The substrate 5 is then heat treated at 350-450 deg.C which is higher than the drying temperature for the silica coating glass film 4. The residual glass 4a is fluidized and flows toward the end face 6. It is cooled and solidified to form an insulating part 7. Since the LED array chip is insulated at the opposite ends in the arranging direction, electrical short circuit can be prevented even if the LED array chips touch each other.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、光学式プリンタの光源
等のために複数並べて使用される発光ダイオードアレイ
チップに係り、特に、たとえ発光ダイオードアレイチッ
プ同士が接触しても電気的短絡が防止できる発光ダイオ
ードアレイチップに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of light emitting diode array chips that are used side by side for a light source of an optical printer, and more particularly to prevent an electrical short circuit even if the light emitting diode array chips are in contact with each other. The present invention relates to a light emitting diode array chip that can be manufactured.

【0002】[0002]

【従来の技術】光学式プリンタの光源には、発光ダイオ
ードアレイ(以下、LEDアレイという)、レーザ、液
晶等が用いられている。LEDアレイを用いた光学系は
機械的可動部がなく、長寿命が期待できる。
2. Description of the Related Art A light emitting diode array (hereinafter referred to as an LED array), a laser, a liquid crystal or the like is used as a light source of an optical printer. The optical system using the LED array has no mechanically movable parts and can be expected to have a long life.

【0003】LEDアレイからなる光学式プリンタの光
源(以下、LEDプリントヘッドという)は、実開平4
−79649号公報、特開平5−162386号公報等
に開示されている。LEDプリントヘッドの発光部は、
図2に示されるように、ガラスエポキシ樹脂やセラミッ
クスから作られた基板(チップを搭載するための基板;
以下、配線基板という)21の表面にメッキや印刷及び
ホトエッチング技術を用いて予め配線22を設け、その
配線基板21上に複数のLEDアレイチップ23(23
1 ,…,23i,…23j)を搭載したものである。L
EDアレイチップ23は、半導体基板(チップを形成す
る基板;以下、単に基板という)上に発光点となる複数
の発光ダイオードを直線状に並べたものである。このよ
うなLEDアレイチップ23が、配線基板21の表面の
中央部に発光点が一直線になるように揃えてj個並べら
れる。LEDアレイチップ23の両脇には個々のLED
を点滅制御するための駆動IC24が搭載されている。
LEDアレイチップ23の各LED発光点のための引出
電極は対応する駆動IC24の各電極に対しそれぞれボ
ンディングワイヤ25で電気的に接続されている。コネ
クタ26は入力信号を得るためのものであり、配線基板
21上の配線22につながっている。このLEDプリン
トヘッドの発光部は、アルミニウム板等で作られた筐体
に光源光収束用ロッドレンズアレイ等と共に取り付けら
れ光学式プリンタの光源となる。
The light source (hereinafter referred to as an LED print head) of an optical printer including an LED array is an actual flat plate.
-79649 and Japanese Patent Laid-Open No. 5-162386. The light emitting part of the LED print head is
As shown in FIG. 2, a substrate made of glass epoxy resin or ceramics (a substrate for mounting a chip;
The wiring 22 is provided on the surface of the wiring board 21 in advance by using plating, printing and photo-etching techniques, and a plurality of LED array chips 23 (23) are provided on the wiring board 21.
1 , ..., 23i, ... 23j) are mounted. L
The ED array chip 23 is formed by arranging a plurality of light emitting diodes, which are light emitting points, on a semiconductor substrate (a substrate on which chips are formed; hereinafter simply referred to as a substrate). Such LED array chips 23 are arranged in the central portion of the surface of the wiring board 21 so that the light emitting points are aligned. Individual LEDs on both sides of the LED array chip 23
A drive IC 24 for controlling blinking is mounted.
The extraction electrode for each LED light emitting point of the LED array chip 23 is electrically connected to each electrode of the corresponding drive IC 24 by a bonding wire 25. The connector 26 is for obtaining an input signal and is connected to the wiring 22 on the wiring board 21. The light emitting portion of the LED print head is attached to a housing made of an aluminum plate or the like together with a light source light converging rod lens array and the like to serve as a light source of an optical printer.

【0004】LEDアレイチップは、図3に示されるよ
うに、一般に、n−GaAsからなる基板31の上部に
n−GaAsP層32、p形拡散層33を設け、その表
面にCVD・SiO2 膜34を設け、このCVD・Si
2 膜34に形成したコンタクトホール35を介してア
ルミニウム蒸着膜等のプラス電極36を設け、基板31
の下部にAu−Ge−Ni膜によるマイナス電極37を
設けたものである。端面38はダイサを用いてウエハか
ら切り出したときの切断面のままであり、特にパッシベ
ーション等は施していない。
As shown in FIG. 3, the LED array chip is generally provided with an n-GaAsP layer 32 and a p-type diffusion layer 33 on a substrate 31 made of n-GaAs, and a CVD / SiO 2 film on the surface thereof. 34 is provided, and this CVD / Si
A positive electrode 36 such as an aluminum vapor deposition film is provided through a contact hole 35 formed in the O 2 film 34, and the substrate 31
A minus electrode 37 made of an Au-Ge-Ni film is provided underneath. The end surface 38 is a cut surface when it is cut out from a wafer by using a dicer, and is not particularly passivated.

【0005】LEDプリントヘッドの発光部にあって
は、図4に示されるように、LEDアレイチップ231
〜23jを配線基板21上のボンディングパターン41
(411 ,412 ,…,41j)上に微小間隔dで順次
隣接させて配置し、それぞれボンディングパターン41
に対し導電性の接着剤42で接着してある。これにより
直線状の光源が形成される。一般に、LEDアレイチッ
プ23同士の間隔dは20〜30μmとされる。これは
各LEDアレイチップ23内の発光点間隔と隣合うLE
Dアレイチップ23の端部発光点同士の間隔とが相違し
ないようにするためである。
In the light emitting portion of the LED print head, as shown in FIG. 4, the LED array chip 23 1
23j to the bonding pattern 41 on the wiring board 21.
(41 1 , 41 2 , ..., 41 j) are sequentially arranged adjacent to each other at a minute interval d, and each bonding pattern 41 is formed.
It is adhered by a conductive adhesive 42. Thereby, a linear light source is formed. Generally, the distance d between the LED array chips 23 is set to 20 to 30 μm. This is the LE adjacent to the light emitting point interval in each LED array chip 23.
This is for ensuring that the distance between the end light emitting points of the D array chip 23 is not different.

【0006】[0006]

【発明が解決しようとする課題】ところで、隣合うLE
Dアレイチップが互いに接触すると電気的に導通してし
まい、チップ単位での発光制御ができなくなる。従っ
て、LEDアレイチップ23を配線基板21上に実装す
るときにLEDアレイチップ23が互いに接触すること
は許されない。しかし、LEDアレイチップ23同士の
間隔dが狭いので、精度の良いチップ搭載機を用いても
隣接LEDアレイチップ23同士の接触がしばしば発生
し、製造歩留まり向上の妨げとなっている。
By the way, the LEs adjacent to each other
When the D array chips come into contact with each other, they are electrically conducted, and it becomes impossible to control light emission on a chip-by-chip basis. Therefore, when the LED array chips 23 are mounted on the wiring board 21, the LED array chips 23 are not allowed to contact each other. However, since the distance d between the LED array chips 23 is small, the adjacent LED array chips 23 often come into contact with each other even if a highly accurate chip mounting machine is used, which hinders the improvement of the manufacturing yield.

【0007】そこで、本発明の目的は、上記課題を解決
し、たとえLEDアレイチップ同士が接触しても電気的
短絡が防止できるLEDアレイチップを提供することに
ある。
SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide an LED array chip capable of preventing an electrical short even if the LED array chips contact each other.

【0008】[0008]

【課題を解決するための手段】上記目的を達成するため
に本発明は、半導体基板上に複数の発光ダイオードを直
線状に並べると共に引出電極を設けた発光ダイオードア
レイチップにおいて、上記半導体基板の発光ダイオード
並び方向両端に絶縁部を形成したものである。
In order to achieve the above object, the present invention provides a light emitting diode array chip in which a plurality of light emitting diodes are linearly arranged on a semiconductor substrate and extraction electrodes are provided. Insulating parts are formed at both ends in the diode arrangement direction.

【0009】上記絶縁部は、予めウエハから上記半導体
基板を切り出すためのチップ切出し線上にガラス膜を形
成し、チップ切出しにより残留したガラスを加熱により
流動させて形成してもよい。
The insulating portion may be formed by forming a glass film on a chip cutting line for cutting the semiconductor substrate from a wafer in advance and allowing the glass remaining after cutting the chip to flow by heating.

【0010】[0010]

【作用】上記構成により、発光ダイオードアレイチップ
は両端が絶縁される。従って、たとえLEDアレイチッ
プ同士が接触しても電気的短絡が防止できる。
With the above structure, both ends of the light emitting diode array chip are insulated. Therefore, even if the LED array chips contact each other, an electrical short circuit can be prevented.

【0011】予めチップ切出し線上にガラス膜を形成し
ておけば、チップ切出しにより基板の両端にガラスが残
る。この残留したガラスを加熱すると流動し、絶縁部が
形成される。
If a glass film is previously formed on the chip cutting line, the glass is left on both ends of the substrate by cutting the chip. When the remaining glass is heated, it flows and an insulating portion is formed.

【0012】[0012]

【実施例】以下本発明の一実施例を添付図面に基づいて
詳述する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

【0013】図1を用いて本発明のLEDアレイチップ
の製造工程を説明する。
The manufacturing process of the LED array chip of the present invention will be described with reference to FIG.

【0014】LEDアレイチップは、1つのウエハに一
括して多数形成され、チップ切出しにより個々のLED
アレイチップに分離される。ここでは、チップの内部構
造や引出電極については本発明と直接関係ないので図示
及び説明を省略する。
A large number of LED array chips are collectively formed on one wafer, and individual LEDs are cut out by cutting the chips.
Separated into array chips. Here, since the internal structure of the chip and the extraction electrode are not directly related to the present invention, illustration and description thereof will be omitted.

【0015】まず、図1(a)に示されるように、ウエ
ハ1には個々のLEDアレイチップを区画するスクライ
ブエリア2が設けられる。スクライブエリア2はチップ
切出し線となる。図示したスクライブエリア2はLED
アレイチップの長手方向(LEDの並び方向)を区画す
るスクライブエリアである。本実施例では、各スクライ
ブエリア2にはホトエッチングにより数十μmの深さの
溝3が形成される。
First, as shown in FIG. 1A, the wafer 1 is provided with a scribe area 2 for partitioning individual LED array chips. The scribe area 2 becomes a chip cutting line. The scribe area 2 shown is an LED
It is a scribe area that divides the array chip in the longitudinal direction (the LED array direction). In this embodiment, a groove 3 having a depth of several tens μm is formed in each scribe area 2 by photoetching.

【0016】その後、図1(b)に示されるように、ウ
エハ1にシリカコーティングガラス塗布液を滴下・回転
塗布し、ウエハ1表面を塗布液で覆う。そして、およそ
200℃の乾燥器中で乾燥させ、ガラス膜4を形成す
る。
Thereafter, as shown in FIG. 1B, a silica coating glass coating liquid is dropped and spin-coated on the wafer 1 to cover the surface of the wafer 1 with the coating liquid. Then, it is dried in a dryer at about 200 ° C. to form the glass film 4.

【0017】その後、図1(c)に示されるように、ド
ライエッチングによりウエハ1表面の平坦部のガラス膜
4を除去し、溝3内のみに厚くガラス膜4を残す。
Thereafter, as shown in FIG. 1C, the glass film 4 on the flat portion of the surface of the wafer 1 is removed by dry etching to leave the thick glass film 4 only in the groove 3.

【0018】次に、図1(d)に示されるように、この
ウエハ1をダイサによりスクライブエリア2毎に切断す
る。こうして、個々のLEDアレイチップの基板5が切
り出される。このときLEDアレイチップの基板5の両
端にはそれぞれガラス4aが残ることになる。
Next, as shown in FIG. 1D, the wafer 1 is cut into scribe areas 2 by a dicer. In this way, the substrate 5 of each LED array chip is cut out. At this time, the glass 4a remains on both ends of the substrate 5 of the LED array chip.

【0019】これらのLEDアレイチップの基板5を前
述のシリカコーティングガラス膜4の乾燥温度より高い
350〜450℃で加熱処理する。このとき残留してい
たガラス4aは加熱されたため流動し、図1(e)に示
されるように、端面6へ流れる。これを冷却して固化す
ることにより絶縁部7が形成される。
The substrate 5 of these LED array chips is heat-treated at 350 to 450 ° C., which is higher than the drying temperature of the silica coating glass film 4 described above. At this time, the remaining glass 4a flows due to being heated and flows to the end face 6 as shown in FIG. 1 (e). The insulating part 7 is formed by cooling and solidifying this.

【0020】ここまでの説明で、絶縁部7の材料として
シリカコーティングガラス(商品名SOG)を用いた
が、このほかにポリイミド樹脂を用いたり、あるいは半
導体製造工程で用いられるホトレジスト膜の材料を流用
したりすることも可能である。即ち、上記製造工程で説
明したように液状の原材料を塗布・乾燥し固体の絶縁物
とすることができる材料であれば、ガラスに限らず、有
機樹脂や感光性樹脂などでもよい。
Although silica coating glass (product name SOG) is used as the material of the insulating portion 7 in the above description, polyimide resin may be used in addition to this, or the material of the photoresist film used in the semiconductor manufacturing process may be diverted. It is also possible to do. That is, as long as it is a material that can be applied with a liquid raw material and dried to form a solid insulator as described in the above manufacturing process, not only glass but also organic resin, photosensitive resin or the like may be used.

【0021】次に実施例の作用を述べる。Next, the operation of the embodiment will be described.

【0022】本発明のLEDアレイチップは、図1
(e)に示されるように、基板の両端に絶縁部7を形成
したものである。絶縁部7は、図示の関係上、大きく描
かれているが、端面6からの厚さは絶縁に必要な程度で
あり、LEDアレイチップを微小間隔dで配列すること
を妨げない厚さとなっている。そこで、このLEDアレ
イチップを図4に示される従来例と同じように配線基板
21上に実装する。その際、チップ搭載機を用いて隣接
LEDアレイチップ23同士の接触がないように行われ
るが、本発明のLEDアレイチップはLED並び方向両
端が絶縁されているので、万一、LEDアレイチップ同
士が接触した場合でも電気的短絡は防止されている。従
って、このように作られたLEDプリントヘッドの発光
部は、チップ単位での発光制御に支障がなく、良品とし
て扱うことができる。
The LED array chip of the present invention is shown in FIG.
As shown in (e), the insulating parts 7 are formed on both ends of the substrate. Although the insulating portion 7 is drawn large for the sake of illustration, the thickness from the end face 6 is a degree necessary for insulation, and is a thickness that does not prevent the LED array chips from being arranged at a minute interval d. There is. Therefore, this LED array chip is mounted on the wiring board 21 in the same manner as the conventional example shown in FIG. At this time, the chip mounting machine is used so that the adjacent LED array chips 23 do not come into contact with each other, but the LED array chips of the present invention are insulated at both ends in the LED arranging direction. Even if they touch, an electrical short circuit is prevented. Therefore, the light emitting portion of the LED print head thus manufactured does not interfere with the light emission control in chip units and can be treated as a good product.

【0023】[0023]

【発明の効果】本発明は次の如き優れた効果を発揮す
る。
The present invention exhibits the following excellent effects.

【0024】(1)隣接LEDアレイチップ同士の接触
があっても問題とならないので、チップ搭載機の精度を
極端に高めず、従来と変らない実装工程によっても製造
歩留まりが向上する。
(1) Since there is no problem even if the adjacent LED array chips contact each other, the accuracy of the chip mounting machine is not extremely increased, and the manufacturing yield is improved by the mounting process which is the same as the conventional mounting process.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明のLEDアレイチップの製造工程をウエ
ハの部分断面で示した図である。
FIG. 1 is a partial cross-sectional view of a wafer showing a manufacturing process of an LED array chip of the present invention.

【図2】LEDプリントヘッドの発光部の平面図であ
る。
FIG. 2 is a plan view of a light emitting unit of an LED print head.

【図3】LEDアレイチップの断面図である。FIG. 3 is a sectional view of an LED array chip.

【図4】LEDアレイチップを配線基板に実装した平面
図及び側面図である。
FIG. 4 is a plan view and a side view in which an LED array chip is mounted on a wiring board.

【符号の説明】[Explanation of symbols]

1 ウエハ 5 基板 7 絶縁部 1 Wafer 5 Substrate 7 Insulation part

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 半導体基板上に複数の発光ダイオードを
直線状に並べると共に引出電極を設けた発光ダイオード
アレイチップにおいて、上記半導体基板の発光ダイオー
ド並び方向両端に絶縁部を形成したことを特徴とする発
光ダイオードアレイチップ。
1. A light emitting diode array chip in which a plurality of light emitting diodes are linearly arranged on a semiconductor substrate and lead electrodes are provided, wherein insulating portions are formed at both ends of the semiconductor substrate in the light emitting diode arrangement direction. Light emitting diode array chip.
【請求項2】 上記絶縁部は、予めウエハから上記半導
体基板を切り出すためのチップ切出し線上にガラス膜を
形成し、チップ切出しにより残留したガラスを加熱によ
り流動させて形成することを特徴とする請求項1記載の
発光ダイオードアレイチップ。
2. The insulating portion is formed by forming a glass film on a chip cutting line for cutting the semiconductor substrate from a wafer in advance, and allowing the glass remaining after the chip cutting to flow by heating. Item 1. A light emitting diode array chip according to item 1.
JP15464295A 1995-06-21 1995-06-21 Light emitting diode array chip Pending JPH098345A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15464295A JPH098345A (en) 1995-06-21 1995-06-21 Light emitting diode array chip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15464295A JPH098345A (en) 1995-06-21 1995-06-21 Light emitting diode array chip

Publications (1)

Publication Number Publication Date
JPH098345A true JPH098345A (en) 1997-01-10

Family

ID=15588686

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15464295A Pending JPH098345A (en) 1995-06-21 1995-06-21 Light emitting diode array chip

Country Status (1)

Country Link
JP (1) JPH098345A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007081333A (en) * 2005-09-16 2007-03-29 Showa Denko Kk Nitride-based semiconductor light-emitting element and manufacturing method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007081333A (en) * 2005-09-16 2007-03-29 Showa Denko Kk Nitride-based semiconductor light-emitting element and manufacturing method thereof

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