JPH0287633A - Mounting of multichip image sensor - Google Patents

Mounting of multichip image sensor

Info

Publication number
JPH0287633A
JPH0287633A JP63240351A JP24035188A JPH0287633A JP H0287633 A JPH0287633 A JP H0287633A JP 63240351 A JP63240351 A JP 63240351A JP 24035188 A JP24035188 A JP 24035188A JP H0287633 A JPH0287633 A JP H0287633A
Authority
JP
Japan
Prior art keywords
adhesive
chips
substrate
image sensor
die bonding
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
JP63240351A
Other languages
Japanese (ja)
Inventor
Yutaka Kaneko
豊 金子
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP63240351A priority Critical patent/JPH0287633A/en
Publication of JPH0287633A publication Critical patent/JPH0287633A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To glue and fix individual chips without being displaced mutually by a method wherein, a bonded part between adjacent chips is glued and fixed in advance in a lowtemperature state so as not to be displaced mutually, a thermosettype adhesive for die bonding use is heated and hardened and the chips are glued and fixed onto a substrate. CONSTITUTION:Individual IC image-sensor chips 2a, 2b whose size is (a) are arranged in a straight line on a substrate 4 by using a thermoset-type adhesive 3 for die bonding use; they are glued and fixed to be capable of reading out a size (l); before their heating and hardening operation, each bonded part 5 between the individual IC image-sensor chips 2a, 2b is glued and fixed by using an adhesive (a low-temperature hardening type adhesive or a UV-hardening type adhesive) 6 which is hardened at a temperature lower than the thermoset- type adhesive 3 for die bonding use; after that, the thermoset-type adhesive 3 for die bonding use on the substrate 4 is cured (hardened by heating); the individual chips 2 and the substrate 4 are glued and fixed.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、等倍密着量イメージスキャナ等に用いられる
マルチチップ型イメージセンサの実装方法に関する。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for mounting a multi-chip image sensor used in a 1x contact amount image scanner or the like.

従来の技術 近年、イメージスキャナ等にあっては、光学系の小型化
を図るため、センサ自体を等倍構成する等倍密着量イメ
ージセンサの開発が活発化している。この場合、例えば
SiウェハによるICイメージセンサチップを用いるも
のでは、Siウェハサイズにより長さが制限されるため
、通常サイズの原稿についても読取り可能に長尺化する
ためには、複数個のICイメージセンサチップを同一基
板上に配列する必要がある。このようなマルチチップ型
のものが、例えばTV学会におけるrIC387−55
JのrCCD密着イメージセンサ」により知られている
2. Description of the Related Art In recent years, in order to reduce the size of the optical system of image scanners and the like, there has been active development of 1x contact amount image sensors in which the sensor itself has a 1x magnification structure. In this case, for example, in the case of using an IC image sensor chip made of a Si wafer, the length is limited by the size of the Si wafer. It is necessary to arrange sensor chips on the same substrate. Such a multi-chip type is, for example, rIC387-55 at the TV Society.
It is known for its ``rCCD close-contact image sensor'' by J.

第5図はこのようなマルチチップ型イメージセンサの実
装例を示すもので、各々同一ピッチで形成された受光画
素部1を有する複数個のICイメージセンサチップ2a
、2b、〜を直線状(又は千鳥状)に配列し加熱硬化型
グイボンディング用接着剤3により同一の基板(例えば
アルミナ基板やセラミック基板)4上に接着固定してな
る。ここに、隣接チップ2a、2b間の接合部5には、
各々のチップ2a、2bの端部の受光画素部1の間隔も
各々のチップ2a、2b上の受光画素部1の間隔と同じ
となるようにわずかな隙間が設定されている。
FIG. 5 shows an example of mounting such a multi-chip image sensor, in which a plurality of IC image sensor chips 2a each having a light-receiving pixel portion 1 formed at the same pitch are used.
, 2b, . Here, in the joint 5 between the adjacent chips 2a and 2b,
A slight gap is set so that the spacing between the light receiving pixel sections 1 at the ends of each chip 2a, 2b is also the same as the spacing between the light receiving pixel sections 1 on each chip 2a, 2b.

また、導電性を持つ加熱硬化型グイポンディング用接着
剤3としては、例えば、下記のような品名のものがある
。ここに、各品名の接着剤の特性につき、■・性状(配
合比)、■・・・溶剤の有無、■−・組成(充填剤/樹
脂)、■・・・キュア条件(温度/時間)、■・・・体
積抵抗率(Ω・釧)、■・・熱伝導率(cal / c
m−see・℃)、■・・・抽出不純物(C,Q−:N
a”)の順に示すものとすると、A。ケミタイトCT2
12(来夏ケミカル社製)■−液性、■有、■Ag/エ
ポキシ、■200’C/]、hr、■0,6X]−0−
’、■6X10−’■55 B、EN−4000(日立化成社製) ■−液性、■有、■Ag/エポキシ、■175’C/l
hr、■2X10−’、■0.6X10−’■1011
.0 C,EN−4070X−13(日立化成社製)■−液性
、■無、■Ag/エポキシ、■150’C/ L hr
”−2,50℃/40sec、■3.3×1o−4、■
−1■10jt。
Further, as the conductive thermosetting adhesive 3 for bonding, there are, for example, those with the following product names. Here, regarding the characteristics of the adhesive of each product name, ■・Properties (mixture ratio), ■・Presence or absence of solvent, ■・Composition (filler/resin), ■・Cure conditions (temperature/time) ,■...Volume resistivity (Ω・Tsuboshi),■...Thermal conductivity (cal/c
m-see・℃), ■...extracted impurities (C, Q-:N
A. Chemitite CT2
12 (manufactured by Next Summer Chemical Company) ■-Liquid, ■Yes, ■Ag/Epoxy, ■200'C/], hr, ■0,6X]-0-
', ■6X10-'■55 B, EN-4000 (manufactured by Hitachi Chemical) ■-Liquid, ■Yes, ■Ag/epoxy, ■175'C/l
hr, ■2X10-', ■0.6X10-'■1011
.. 0 C, EN-4070X-13 (manufactured by Hitachi Chemical) ■-Liquid, ■None, ■Ag/Epoxy, ■150'C/L hr
”-2,50℃/40sec, ■3.3×1o-4, ■
-1■10jt.

1つ、CRM−1,038(住友ベークライト社製)■
−液性、■無、■Ag/エポキシ、■2o○’C/ 1
 hr 〜170℃/20sec+ 350℃/20s
ec:、■2X1.O−’、■3XIO−、■1゜E、
CRM−1058(住友ベークライト社製)■−液性、
■有、■Ag/ポリイミド、■150℃/ t hr〜
250°C/lhr、■2XIO−’■−1■1020 F、   Abl、ebond  84−I  LM、
F   (l\blest、ic社製)■−液性、■無
、■Ag/エポキシ、■150℃/lhr、■2XIO
−’、■−’+、5X10−’■1010 G、  Ablebond  71 − I  LM 
 丁  (Ablestic 社製)■−液性、■有、
■Ag/ポリイミド、■150°C/ 30m1n 〜
275°C/30m1n、■2×1o−’、■−2■1
015 H,EPO−TEK  H−20ELC(EpoxyT
 echnology社製) ■二液性(1: l) 、■無、■Ag/エポキシ、■
120℃/15m1n、■3XIO−’、■4×】O−
3、■30 1、IEP  ○ −ゴEK    H35−175M
(E poxy T echnology社製)■−液
性、■無、■Ag/エポキシ、■1.80’C/ ]、
 hr、■2X10−’、■−1■10110J 、 
 DIJ Pont 4621 D (DIJ Pan
t社製)■−液性、Q)右、■Ag/エポキシ、■17
5’C/ l tar、■4XLO−’、■−1■2(
]10に、 C−990(Amicon社製)■−液性
、■無、■Ag/エポキシ、■155’C/lhr、■
6.5X]、O−’、■−1■10L、 C−940−
AXLC(Amicon社製)■−液性、■有、■Ag
/ポリイミド、0175°C/ 3 0m1n 〜2 
7 5℃/30m1n、 ■−■−1■1020 このようなチップ2a、2b間の接合部5の間隔が適正
に維持されないと、受光画素部1の連続性が乱れ、読取
り品質が劣化してしまう。
1, CRM-1,038 (manufactured by Sumitomo Bakelite) ■
-Liquid, ■None, ■Ag/Epoxy, ■2o○'C/1
hr ~170℃/20sec+350℃/20s
ec:, ■2X1. O-', ■3XIO-, ■1゜E,
CRM-1058 (manufactured by Sumitomo Bakelite) ■-Liquid,
■Yes, ■Ag/polyimide, ■150℃/t hr~
250°C/lhr, ■2XIO-'■-1■1020 F, Abl, ebond 84-I LM,
F (l\brest, manufactured by IC) ■-Liquid, ■None, ■Ag/epoxy, ■150℃/lhr, ■2XIO
-', ■-'+, 5X10-' ■1010 G, Ablebond 71 - I LM
Ding (manufactured by Ablestic) ■-Liquid, ■Yes,
■Ag/polyimide, ■150°C/30m1n ~
275°C/30m1n, ■2×1o-', ■-2■1
015 H, EPO-TEK H-20ELC (EpoxyT
(manufactured by technology) ■Two-component (1: l), ■None, ■Ag/epoxy, ■
120℃/15m1n, ■3XIO-', ■4×】O-
3, ■30 1, IEP ○ -Go EK H35-175M
(manufactured by E poxy technology) ■-liquid, ■no, ■Ag/epoxy, ■1.80'C/],
hr, ■2X10-', ■-1■10110J,
DIJ Pont 4621D (DIJ Pan
Manufactured by T company) ■-Liquid, Q) Right, ■Ag/epoxy, ■17
5'C/ l tar, ■4XLO-', ■-1■2(
] 10, C-990 (manufactured by Amicon) ■-Liquid, ■None, ■Ag/epoxy, ■155'C/lhr, ■
6.5X], O-', ■-1■10L, C-940-
AXLC (manufactured by Amicon) ■-Liquid, ■Yes, ■Ag
/Polyimide, 0175°C/ 30m1n ~2
7 5°C/30m1n, ■-■-1■1020 If the distance between the joints 5 between the chips 2a and 2b is not maintained properly, the continuity of the light-receiving pixel portion 1 will be disturbed and the reading quality will deteriorate. Put it away.

発明が解決しようとする問題点 ところが、従来のようなダイボンディング用接着剤3に
よる実装方法の場合、前述した文献中の[4,2ダイボ
ンディング」の欄にも記載されているように、チップ2
a、2b、〜のダイボンディング時にチップ、ずれを生
じてしまい、隣接チップ間の画素ピッチが変動してしま
う。これにより、上記のような読取り品質の劣化が生ず
る。
Problems to be Solved by the Invention However, in the case of the conventional mounting method using adhesive 3 for die bonding, as described in the column [4, 2 die bonding] in the above-mentioned document, the chip 2
During die bonding of chips a, 2b, . This causes the deterioration in reading quality as described above.

このようなダイボンディング時のチップずれは、前述し
たようなダイボンディング用接着剤3のキュア温度(硬
化温度)が何れの場合でもl OO’C以上であるため
、Siによるチップ2の熱膨張係数(α(Si)= 2
. 33 X I O−’ (1/’C〕)とセラミッ
クによる基板4の熱膨張係数(α(Se)=65 X 
I O−’ [1/’C) )との差、及び、加熱硬化
型の一液性エポキシ接着剤において顕著に現れる硬化時
の粘度の低下による液だれ(チキン性)により生じる。
Such chip misalignment during die bonding is caused by the coefficient of thermal expansion of the chip 2 due to Si, since the curing temperature (hardening temperature) of the die bonding adhesive 3 as described above is equal to or higher than lOO'C in any case. (α(Si)=2
.. 33
This is caused by the difference from I O-'[1/'C)) and dripping (chickenness) due to a decrease in viscosity during curing, which is noticeable in heat-curable one-component epoxy adhesives.

問題点を解決するための手段 複数個のICイメージセンサチップを同一基板上に順次
隣接させて配列するマルチチップ型イメージセンサの実
装方法において、ICイメージセンサチップを基板に固
定させる加熱硬化型ダイボンディング用接着剤に比して
低温で硬化する低温硬化型接着剤又は紫外線硬化型接着
剤により前記ICイメージセンサチップ間の接合部を接
着固定した後、前記加熱硬化型ダイボンディング用接着
剤を硬化させて各ICイメージセンサチップを基板上に
接着固定する。
Means for Solving the Problems In a mounting method for a multi-chip image sensor in which a plurality of IC image sensor chips are sequentially arranged adjacent to each other on the same substrate, heat-curing die bonding is used to fix the IC image sensor chips to the substrate. After adhering and fixing the joint between the IC image sensor chips with a low-temperature curing adhesive or an ultraviolet curing adhesive that cures at a lower temperature than the adhesive used for die bonding, the heat-curing adhesive for die bonding is cured. Each IC image sensor chip is adhesively fixed onto the substrate.

作用 隣接チップ間の接合部を予め低温硬化型接着剤又は紫外
線硬化型接着剤により低温状態で接着固定してから、加
熱硬化型ダイボンディング用接着剤を加熱により硬化さ
せてチップを基板上に接着固定するので、チップと基板
との熱膨張係数に差があったり、チキン性があっても、
各チップ相互間のずれのない接着固定が可能となり、セ
ンサ配列精度の高いものとなる。
Function: The joints between adjacent chips are bonded and fixed in advance at a low temperature using a low-temperature curing adhesive or an ultraviolet curing adhesive, and then the chips are bonded to the substrate by curing the heat-curing die bonding adhesive by heating. Because it is fixed, even if there is a difference in the coefficient of thermal expansion between the chip and the board, or there is a tendency to
It becomes possible to bond and fix each chip without any displacement between the chips, and the sensor arrangement becomes highly accurate.

実施例 本発明の第一の実施例を第1図及び第2図に基づいて説
明する。第5図で示した部分と同一部分は同一符号を用
いて示す。本実施例でも、基本的には、・加熱硬化型ダ
イボンディング用接着剤3により寸法がaなる各ICイ
メージセンサチップ2a、2b、2c、2dを基板4上
に1直線上に配列して寸法Ωなる読取り可能に接着固定
するが、その加熱硬化に先立ち、各ICイメージセンサ
チップ2a、2b、2c、2d間の各接合部5を加熱硬
化型ダイボンディング用接着剤3よりも低温で硬化する
接着剤(低温硬化型接着剤又は紫外線硬化型接着剤)6
により接着固定した後で、基板4」二の加熱硬化型ダイ
ボンディング用接着剤3をキュア(加熱硬化)させて、
各チップ2と基板4とを接着固定するようにしたもので
ある。
Embodiment A first embodiment of the present invention will be explained based on FIGS. 1 and 2. The same parts as those shown in FIG. 5 are indicated using the same reference numerals. In this embodiment, basically, each IC image sensor chip 2a, 2b, 2c, 2d having a dimension a is arranged in a straight line on a substrate 4 using a heat-curable die bonding adhesive 3. Ω, but prior to heat curing, each joint 5 between each IC image sensor chip 2a, 2b, 2c, and 2d is cured at a lower temperature than the heat-curable die bonding adhesive 3. Adhesive (low temperature curing adhesive or ultraviolet curing adhesive) 6
After adhesion and fixation, the heat-curable die bonding adhesive 3 on the substrate 4'' is cured (heat-cured).
Each chip 2 and a substrate 4 are adhesively fixed.

二二に、接着剤6としては、低温硬化型接着剤であれば
、例えばエポキシ・テクノロジー社製の耐熱用接着剤3
00シリーズ39o(硬化条件:常温30分)又は同社
製の光学用接着剤である同シリーズ301 (硬化条件
:65°Cで1時間)や、紫外線硬化型接着剤であれば
、例えばノーランド゛・プロダクツ社製のN0A60が
用いられる。また、加熱硬化型ダイボンディング用接着
剤3としては前述したA −Lのような接着剤が用いら
れる。
22. As the adhesive 6, if it is a low-temperature curing adhesive, for example, heat-resistant adhesive 3 manufactured by Epoxy Technology Co., Ltd.
00 series 39o (curing conditions: 30 minutes at room temperature), the same series 301 (curing conditions: 65°C for 1 hour), an optical adhesive made by the same company, or UV-curable adhesives such as Norland. N0A60 manufactured by Products Co., Ltd. is used. Further, as the thermosetting die bonding adhesive 3, an adhesive such as A-L mentioned above is used.

このように本実施例方法によれば、各チップ2間の接合
部5を低温条件下に接着剤6により予め接着固定し、相
互間の位置ずれを抑えた状態で、最終的に加熱硬化型ダ
イボンディング用接着剤3を加熱硬化させて基板4上に
固定するので、ダイボンディングに際しての熱膨張係数
差などの影響によるずれを抑制できる。この結果、各チ
ップ間の接合部5においても受光画素部1間の配列精度
をほぼチップ設置精度(=アライメントー例えば5μm
以下)に抑えることができる。よって、チップ間接合部
付近で読取り品質が低下することはない。これは、現状
の400dpi レベル対応の高密度のマルチチップセ
ンサでも対応できるものである。
In this way, according to the method of this embodiment, the bonding portions 5 between the chips 2 are bonded and fixed in advance with the adhesive 6 under low temperature conditions, and the heat-curable Since the die bonding adhesive 3 is heat-cured and fixed onto the substrate 4, it is possible to suppress deviations due to effects such as differences in thermal expansion coefficients during die bonding. As a result, even at the joint 5 between each chip, the arrangement accuracy between the light-receiving pixel parts 1 is approximately equal to the chip installation accuracy (=alignment - for example, 5 μm).
below). Therefore, reading quality does not deteriorate near the inter-chip junction. This can be achieved even with the current high-density multi-chip sensor that supports the 400 dpi level.

つづいて、本発明の第二の実施例を第3図により説明す
る。本実施例は、セラミック基板4上に接合部5を除く
チップ下面に加熱硬化型グイボンディング用接着剤3を
スクリーン印刷塗布した後、接合部に位置させて接着剤
6をディスペンスし、この状態で各チップ2を基板4上
にアライメントし、接着剤6の硬化により各チップ2間
の接合部5を接着固定した後で、最後に加熱硬化型ダイ
ボンディング用接着剤3をキュアするようにしたもので
ある。
Next, a second embodiment of the present invention will be described with reference to FIG. In this example, after applying a heat-curing adhesive 3 for bonding by screen printing to the lower surface of the chip excluding the joint part 5 on a ceramic substrate 4, the adhesive 6 is dispensed after being positioned at the joint part. After aligning each chip 2 on the substrate 4 and adhesively fixing the joint 5 between each chip 2 by curing the adhesive 6, the heat-curable die bonding adhesive 3 is finally cured. It is.

また、本発明の第三の実施例を第4図により説明する。Further, a third embodiment of the present invention will be explained with reference to FIG.

本実施例は、複数個のチップ2を順次千鳥状配列させる
場合に適用したものであり、この場合にも短手方向の隣
接接合部5が先に接着剤6により接着固定される。千鳥
状配列にあっても、長手方向に見た場合の隣接チップ間
の受光画素部1間のピッチが等間隔とされる。
This embodiment is applied to a case where a plurality of chips 2 are sequentially arranged in a staggered manner, and in this case as well, the adjacent joint portions 5 in the transverse direction are adhesively fixed with the adhesive 6 first. Even in the staggered arrangement, the pitches between the light-receiving pixel portions 1 between adjacent chips are equal when viewed in the longitudinal direction.

発明の効果 本発明は、上述したように隣接チップ間の接合部を予め
低温硬化型接着剤又は紫外線硬化型接着剤により低温状
態で接着固定し相互ずれのない状態にしてから、加熱硬
化型ダイボンディング用接着剤を加熱により硬化させて
チップを基板上に接着固定するようにしたので、チップ
と基板との熱膨張係数に差があったり、チキン性があっ
ても。
Effects of the Invention As described above, the present invention is capable of bonding and fixing the joints between adjacent chips at a low temperature with a low-temperature curing adhesive or an ultraviolet curing adhesive in advance so that there is no mutual displacement, and then attaching the heat-curable die. Since the bonding adhesive is cured by heating and the chip is bonded and fixed to the substrate, it can be used even if there is a difference in the coefficient of thermal expansion between the chip and the substrate, or if there is a tendency to change.

各チップ相互間のずれのない接着固定が可能となり、セ
ンサ配列精度の高いものとな(j、高品位の読取りを可
能とすることができる。
It becomes possible to adhesively fix each chip without any displacement between them, and the sensor arrangement becomes highly accurate (j, high quality reading becomes possible).

【図面の簡単な説明】[Brief explanation of the drawing]

第1図(a)は本発明の第一の実施例を示す平面図、同
図(b)はその縦断正面図、第2図はセンサ全体の概略
平面図、第3図(a)は本発明の第二の実施例を示す平
面図、同図(b)はその縦断正面図、第4図(a)は本
発明の第三の実施例を示す平面図、同図(b)はその縦
断正面図、第5図(a)は従来例を示す平面図、同図(
b)はその縦断正面図である。 2・・ICイメージセンサチップ、3・・・加熱硬化型
グイボンディング用接着剤、4・・基板、5・・・接合
部、6・・低温硬化型接着剤又は紫外線硬化型接着剤 3.1 図 −第Z図 −〇
FIG. 1(a) is a plan view showing a first embodiment of the present invention, FIG. 1(b) is a vertical front view thereof, FIG. 2 is a schematic plan view of the entire sensor, and FIG. 3(a) is a main FIG. 4(b) is a plan view showing the second embodiment of the invention, FIG. 4(b) is a longitudinal sectional front view thereof, FIG. 5(a) is a plan view showing a conventional example;
b) is a longitudinal sectional front view thereof. 2... IC image sensor chip, 3... Heat-curing type bonding adhesive, 4... Substrate, 5... Joint portion, 6... Low-temperature curing adhesive or ultraviolet curing adhesive 3.1 Figure - Figure Z - 〇

Claims (1)

【特許請求の範囲】[Claims] 複数個のICイメージセンサチップを同一基板上に順次
隣接させて配列するマルチチップ型イメージセンサの実
装方法において、ICイメージセンサチップを基板に固
定させる加熱硬化型ダイボンディング用接着剤に比して
低温で硬化する低温硬化型接着剤又は紫外線硬化型接着
剤により前記ICイメージセンサチップ間の接合部を接
着固定した後、前記加熱硬化型ダイボンディング用接着
剤を硬化させて各ICイメージセンサチップを基板上に
接着固定したことを特徴とするマルチチップ型イメージ
センサの実装方法。
In a mounting method for a multi-chip image sensor in which multiple IC image sensor chips are arranged adjacent to each other on the same substrate, the temperature is lower than that of a thermosetting die bonding adhesive that fixes the IC image sensor chips to the substrate. After bonding and fixing the joints between the IC image sensor chips using a low-temperature curing adhesive or an ultraviolet ray curing adhesive, the heat-curing die bonding adhesive is cured to attach each IC image sensor chip to the substrate. A method for mounting a multi-chip image sensor characterized by adhesively fixing the sensor to the top.
JP63240351A 1988-09-26 1988-09-26 Mounting of multichip image sensor Pending JPH0287633A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63240351A JPH0287633A (en) 1988-09-26 1988-09-26 Mounting of multichip image sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63240351A JPH0287633A (en) 1988-09-26 1988-09-26 Mounting of multichip image sensor

Publications (1)

Publication Number Publication Date
JPH0287633A true JPH0287633A (en) 1990-03-28

Family

ID=17058197

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63240351A Pending JPH0287633A (en) 1988-09-26 1988-09-26 Mounting of multichip image sensor

Country Status (1)

Country Link
JP (1) JPH0287633A (en)

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