JP2542900B2 - Linear light source and rod lens - Google Patents
Linear light source and rod lensInfo
- Publication number
- JP2542900B2 JP2542900B2 JP63087911A JP8791188A JP2542900B2 JP 2542900 B2 JP2542900 B2 JP 2542900B2 JP 63087911 A JP63087911 A JP 63087911A JP 8791188 A JP8791188 A JP 8791188A JP 2542900 B2 JP2542900 B2 JP 2542900B2
- Authority
- JP
- Japan
- Prior art keywords
- rod
- shaped lens
- light source
- linear light
- resin
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 イ）産業上の利用分野 本発明は発光ダイオードを用いた線状光源と線状光源
用の棒状レンズに関する。TECHNICAL FIELD The present invention relates to a linear light source using a light emitting diode and a rod lens for the linear light source.
ロ）従来の技術 近年、原稿の照明等に用いる線状光源として、蛍光灯
などにかわって発光ダイオードが利用されはじめた。こ
れは特開昭60−230621号公報等に示される様に、長尺の
基板に発光ダイオードを１乃至数列に整列させ、その上
方に棒状レンズを支持したものである。B) Conventional Technology In recent years, light emitting diodes have begun to be used in place of fluorescent lamps as a linear light source used for illuminating an original or the like. As disclosed in Japanese Patent Laid-Open No. 60-230621, light emitting diodes are arranged in one to several rows on a long substrate, and a rod-shaped lens is supported above the light emitting diodes.
斯る棒状レンズとして最も利用されるのは、ガラス製
の円柱レンズ（丸棒）である。これは長くても丈夫でレ
ンズと発光ダイオードとの距離が一定に保ちやすい事、
レンズの透明度を高く保てる事、入手し易いことなどの
理由から利用されている。A cylindrical lens (round bar) made of glass is most used as such a rod-shaped lens. This is tough even if it is long, and it is easy to keep the distance between the lens and the light emitting diode constant,
It is used for reasons such as keeping the transparency of the lens high and easy to obtain.
しかし乍ら、ガラス製棒状レンズは照光面における照
光巾と照度の調整が困難である。即ち、レンズから原稿
等の照光面までの距離を定めた上で、0.5〜1.2mm程度の
所定の照光巾が得られるように棒状レンズの直径と、発
光ダイオードとの距離を定めるのであるが、照光巾を広
くすれば照度は低下する。一般に照光巾は線状光源や読
取素子の取付作業を容易にするため1.0〜5.0mmと、出来
るだけ巾広い事が要求される。従って照度が許容限度に
近くなり、わずかに仕様が変更になる毎にガラス製棒状
レンズの直径や、支える枠体の高さなどを設計し直さな
くてはならないので、生産性が悪かった。However, it is difficult for the glass rod-shaped lens to adjust the illumination width and illuminance on the illumination surface. That is, after determining the distance from the lens to the illuminated surface of the original or the like, the diameter of the rod-shaped lens and the distance to the light emitting diode are determined so that a predetermined illumination width of about 0.5 to 1.2 mm can be obtained. Increasing the width of illumination reduces the illuminance. Generally, the illumination width is required to be as wide as possible, 1.0 to 5.0 mm, in order to facilitate the work of attaching the linear light source and the reading element. Therefore, the illuminance is close to the allowable limit, and the diameter of the glass rod lens and the height of the supporting frame have to be redesigned every time the specification is slightly changed, resulting in poor productivity.
ハ）発明が解決しようとする課題 そこで棒状レンズを、レンズの曲率が比較的自由にな
る樹脂で成型することを検討した。しかし棒状レンズは
直径（もしくは厚み）が高々10mmに対し長さが80〜500m
mと細長く、途中に継目を設けることができない。この
ため樹脂棒状レンズは、成型時の樹脂流れのあとが表面
の模様となったり段層状界面を形成し易く、これは照光
むらとなるので好ましくない。また、さらに条件が悪く
なるとレンズ中に気泡が入ったり、粗面化や白濁等によ
り透明度が低下して所定の光学特性が得られず不都合で
あった。また、この様な不都合が発生しなかった棒状レ
ンズにおいても、発光ダイオードは点灯によって発熱し
基板や枠体で伸縮が生じるのに対し、細長い樹脂はこれ
を矯正する力はなく、棒状レンズが枠体中に陥没した
り、反ることにより枠体からはずれたりして、照光面に
対する光学的位置関係を一定に保ことが困難であった。C) Problem to be Solved by the Invention Therefore, it was studied to mold the rod-shaped lens with a resin having a relatively free curvature. However, a rod-shaped lens has a diameter (or thickness) of at most 10 mm and a length of 80 to 500 m.
It is long and slender, and a seam cannot be provided on the way. For this reason, the resin rod-shaped lens is not preferable because it tends to form a pattern on the surface after the resin flow at the time of molding or to form a step-like interface, which causes uneven illumination. Further, when the conditions are further deteriorated, bubbles are included in the lens, or the transparency is lowered due to surface roughening or clouding, which makes it impossible to obtain predetermined optical characteristics, which is inconvenient. In addition, even in the rod-shaped lens in which such inconvenience did not occur, the light emitting diode generates heat by lighting and the substrate and the frame expand and contract, whereas the elongated resin has no power to correct this and the rod-shaped lens is It has been difficult to maintain a constant optical positional relationship with respect to the illuminated surface because it is depressed in the body or is dislocated from the frame due to warping.
ニ）課題を解決するための手段 本発明は上述した点を考慮してなされたもので、前述
した線状光源の棒状レンズとして、支持枠体の側壁に予
じめ設けられた係止部に嵌合する係止突起と枠体の側壁
の頂部に当接する翼部とを側面に交互に有した樹脂成型
品を用いるものである。D) Means for Solving the Problems The present invention has been made in consideration of the above-mentioned points, and as the rod-shaped lens of the linear light source described above, the locking portion preliminarily provided on the side wall of the support frame. A resin molded product is used, which has locking projections to be fitted and wing portions abutting on the tops of the side walls of the frame body alternately on the side surfaces.
また本発明は斯る線状光源用の棒状レンズとして、全
体が略かまぼこ状をなし、両側部に小さい突起からなる
係止突起と大きい突起からなる翼部を略一直線状に配置
し、略中央部に樹脂注入ゲート処理部を設けた樹脂成型
品を用いるものである。Further, the present invention, as a rod-shaped lens for such a linear light source, has a substantially semi-cylindrical shape as a whole, and locking wings made up of small projections and wing portions made up of large projections are arranged on both sides in a substantially straight line, and at a substantially central position. This is a resin molded product in which a resin injection gate processing part is provided in the part.
ホ）作用 これにより棒状レンズは曲率が自在となって透明度も
優れ照光巾が広くかつ照度を高く維持できる。また線状
光源は組立作業性も歩留りも共によく、堅牢で、さらに
は良好な光学特性が長期間保たれる。(E) Action This allows the rod-shaped lens to have a free curvature, has excellent transparency, and has a wide illumination width and high illuminance. Further, the linear light source has good assembling workability and yield, is robust, and has good optical characteristics for a long period of time.
以下実施例につき第１図及び第２図を参照し乍ら詳細
に説明する。An embodiment will be described in detail below with reference to FIGS. 1 and 2.
ヘ）実施例 これらの図において（１）は長尺な基板で、例えば巾
4mm長さ350mmのガラスエポキシ樹脂基板などからなり、
表面もしくは表裏面にプリントパターン（導電箔）を有
し、好ましくは配線領域を除いて表面最表層に光反射性
白色塗料が塗布してある。（２）はその基板（１）の上
に１列に整列して載置固着され配線が施こされた発光ダ
イオードで、例えば１辺0.2〜0.4mmの略さいころ状をな
したGaP、GaAsP等からなり、5mm間隔で配置されてい
る。（３）は先端を溶着されたピン（31）等で基板
（１）に固着された枠体で、発光ダイオード（２）の列
に沿う光反射性の側壁（32）と発光ダイオード（２）を
１乃至数個毎に仕切る高さの低い仕切反射面（33）とで
発光ダイオード（２）を囲繞しており、両端には棒状レ
ンズを固定するための固定用孔（34）を有し側壁（32）
の頂部には孔又は窪からなる係止部（35）が設けてあ
る。F) Example In these figures, (1) is a long substrate, for example, width
It consists of 4mm length 350mm glass epoxy resin substrate etc.,
It has a print pattern (conductive foil) on the front surface or the front and back surfaces, and preferably a light-reflecting white paint is applied to the outermost surface layer except the wiring region. (2) is a light emitting diode which is mounted on the substrate (1) in a line so as to be fixed in a row and provided with wiring. For example, GaP, GaAsP or the like having a side of 0.2 to 0.4 mm and having a substantially dice shape. It is made of and is arranged at intervals of 5 mm. Reference numeral (3) is a frame body fixed to the substrate (1) by a pin (31) or the like having its tip welded, and has a light-reflecting side wall (32) and a light emitting diode (2) along a row of the light emitting diodes (2). The light emitting diode (2) is surrounded by a partitioning reflecting surface (33) having a low height for partitioning every one to several pieces, and has fixing holes (34) at both ends for fixing the rod-shaped lens. Side wall (32)
A locking portion (35) consisting of a hole or a recess is provided on the top of the.
（４）は発光ダイオード（２）の上方に位置する様に
枠体（３）に固定された棒状レンズで、略かまぼこ状を
なした樹脂成型品からなり、その稜線の方向が発光ダイ
オード（２）の整列方向と平行になるように固定用孔
（34）で固定されている。この固定用孔（34）に挿入さ
れる部分（41）は棒状レンズの上下方向の反り防止及び
横ずれ防止のため、断面半円形など棒状レンズ略中央部
とは異なった形状とするのが好ましい。この棒状レンズ
（４）の両側面には係止部（35）に嵌合される小さい突
出部からなる係止突起（42）と、枠体（３）の側壁（3
2）の頂部に当接する大きい突出部からなる翼部（43）
を交互に一定間隔で設けてある。この係止突起（42）と
翼部（43）はその下面が一直線状になるように配置され
ているが、棒状レンズの中央部（44）片側においては樹
脂成型時の金型の樹脂注入ゲートを設けたために生ずる
バリを処理した樹脂注入ゲート処理部（45）があるので
係止突起（42）も翼部（43）も設けてない。Reference numeral (4) is a rod-shaped lens fixed to the frame (3) so as to be located above the light emitting diode (2), and is made of a resin-molded product having a substantially semicylindrical shape. ) Is fixed by a fixing hole (34) so as to be parallel to the alignment direction. It is preferable that the portion (41) inserted into the fixing hole (34) has a shape different from the substantially central portion of the rod-shaped lens, such as a semicircular section, in order to prevent the rod-shaped lens from being warped in the vertical direction and from being laterally displaced. On both side surfaces of the rod-shaped lens (4), a locking projection (42) made up of a small projection fitted into the locking portion (35) and a side wall (3) of the frame body (3).
Wing (43) consisting of a large protrusion that abuts the top of 2)
Are alternately provided at regular intervals. The locking projections (42) and the wings (43) are arranged such that the lower surfaces thereof are in a straight line, but on one side of the central part (44) of the rod-shaped lens, the resin injection gate of the mold at the time of resin molding. Since there is a resin injection gate processing section (45) that has processed the burr that occurs due to the provision of the above, the locking projection (42) and the wing section (43) are not provided.
斯る棒状レンズ（４）は例えば耐熱アクリル樹脂の射
出成型品からなり、樹脂注入ゲートを棒中央部の下側で
あって係止突起や翼部と同じ列の中に偏平に設けること
によって曇りや気泡のない、そして樹脂流れのあとがつ
かない透明な棒状レンズを量産性よく製造できる。また
棒状レンズ（４）を枠体（３）に固定するには両者のた
わみを利用して、棒状レンズ（４）の１端から、もしく
は両端を固定用孔（34）に挿入して嵌め込んでいけばよ
い。このためには係止部（35）の上方内側に傾斜部（35
1）を設けて係止用突起（42）が入りやすくし、係止部
（35）の下側外面に部分的に窪（352）を設けて側壁（3
2）に弾力をもたせれば、より好ましい。Such a rod-shaped lens (4) is made of, for example, a heat-resistant acrylic resin injection-molded product, and is provided with a resin injection gate flat below the center of the rod and in the same row as the locking protrusions and wings, thereby forming a cloud. It is possible to mass-produce a transparent rod-shaped lens that is free from air bubbles and bubbles and does not leave behind resin flow. Further, in order to fix the rod-shaped lens (4) to the frame body (3), the deflection of both is used to insert the rod-shaped lens (4) from one end or both ends by inserting it into the fixing hole (34). You should go. For this purpose, the inclined part (35
1) is provided so that the locking projection (42) can be easily inserted, and the recess (352) is partially provided on the lower outer surface of the locking portion (35) to form the side wall (3).
It is more preferable if 2) has elasticity.
棒状レンズ（４）は、具体的に例示すると長さ350mm
高さ2.5mm巾3.0mmで上側に曲率半径2.0mmの円弧部から
なるレンズを設け下側は平坦もしくは曲率半径の上側に
比し充分大きいレンズとする。そしてその下側の略平坦
部を基準として0.6mmの位置に基準直線部を設けその基
準直線部上に高さ0.3mm長さ2.5mm突出量0.25mmの係止用
突起（42）と高さ0.7mm長さ4.0mm突出量1.0mmの翼部（4
3）とをいずれも20mmピッチで設け、一側には各々16、1
5個、もう一側には各々14、14個設けてある。そして樹
脂注入ゲート処理部（45）は高さ0.5mm巾20mmに設けて
ある。とりわけ樹脂流れのあとを残さないためには、こ
のように円弧部の中心（46）より下方であって、円弧部
の半径の1/2より短い位置に略平坦部を設け、略平坦部
から基準線までの高さ（l1）を中心（46）の高さと略等
しいかそれより高い位置に樹脂注入ゲートを設ければよ
い。上記の例では高さ（l1）は中心の高さよりl2＝0.1m
mだけ高い。成型は光学鏡面仕上とし、コリコート処理
などの表面処理を施こすとより好ましい。The rod-shaped lens (4) has a length of 350 mm, as a specific example.
A lens consisting of an arc portion with a height of 2.5 mm and a width of 3.0 mm and a radius of curvature of 2.0 mm is provided on the upper side, and the lower side is flat or is sufficiently larger than the upper side of the radius of curvature. Then, a reference straight line portion is provided at a position of 0.6 mm with reference to the substantially flat portion on the lower side thereof, and a height of 0.3 mm, a length of 2.5 mm, and a protrusion of 0.25 mm and a height of 0.3 mm on the reference straight line portion. 0.7 mm long 4.0 mm Wings with 1.0 mm protrusion (4
3) and are both provided at a pitch of 20 mm, and one side has 16, 1 respectively.
There are 5 and 14, 14 on each side. The resin injection gate processing section (45) is provided with a height of 0.5 mm and a width of 20 mm. In particular, in order not to leave behind the resin flow, a substantially flat portion is provided at a position below the center (46) of the circular arc portion and shorter than 1/2 of the radius of the circular arc portion. The resin injection gate may be provided at a position where the height (l 1 ) to the reference line is substantially equal to or higher than the height of the center (46). In the above example, the height (l 1 ) is l 2 = 0.1m from the center height
Only m higher. It is more preferable that the molding is performed with an optical mirror finish and that a surface treatment such as a colli coat treatment is performed.
この例では5mm離れたところで最小巾20mm長さ320mmに
わたって最小照度1000luxの高照度巾広照明が行える。In this example, at a distance of 5 mm, a minimum illumination of 20 lux, a length of 320 mm, and a minimum illumination of 1000 lux can be performed with high illumination and wide illumination.
ト）発明の効果 以上の如くにより生産歩留りよく光学特性の優れた棒
状レンズが得られ、線状光源は組立てやすく棒状レンズ
と枠体の密着性がよいので堅牢で、かつ、照光巾が広く
高照度でしかも長期間良好な光学特性を保てる線状光源
が提供できた。G) Effect of the invention As described above, a rod lens with good production yield and excellent optical characteristics can be obtained. The linear light source is easy to assemble and the adhesion between the rod lens and the frame is good, so it is robust and has a wide illumination range. We were able to provide a linear light source that can maintain good optical characteristics for a long period of time with illuminance.
第１図は本発明実施例の線状光源の断面図、第２図
（ａ）及び（ｂ）は棒状レンズの断面図、同図（ｃ）は
側面図である。 （１）……基板、（２）……発光ダイオード、（３）…
…枠体、（31）……ピン、（32）……側壁、（33）……
仕切反射面、（34）……固定用孔、（35）……係止部、
（４）……棒状レンズ、（42）……係止突起、（43）…
…翼部、（44）……レンズの中央部、（45）……樹脂注
入ゲート処理部。FIG. 1 is a sectional view of a linear light source according to an embodiment of the present invention, FIGS. 2 (a) and 2 (b) are sectional views of a rod-shaped lens, and FIG. 1 (c) is a side view. (1) ... Substrate, (2) ... Light emitting diode, (3) ...
… Frame, (31) …… pin, (32) …… side wall, (33) ……
Partition reflective surface, (34) …… Fixing hole, (35) …… Locking part,
(4) …… Bar lens, (42) …… Locking protrusion, (43)…
… Wing part, (44) …… Center part of lens, (45) …… Resin injection gate processing part.
Claims (4)
置固着された複数の発光ダイオードと、その発光ダイオ
ードの列に沿う側壁を有して基板上に固定された枠体
と、発光ダイオードの列に平行な稜線を有し発光ダイオ
ードの上方に位置する様に枠体に固定された棒状レンズ
とを具備した線状光源において、前記棒状レンズは前記
枠体の側壁に予じめ設けられた係止部に嵌合する係止突
起と、枠体の側壁の頂部に当接する翼部とを具備した樹
脂成型品からなる事を特徴とする線状光源。1. A frame body having a long substrate, a plurality of light emitting diodes aligned and mounted on the substrate, and fixedly mounted on the substrate, having side walls along the rows of the light emitting diodes. And a rod-shaped lens fixed to the frame body so as to be located above the light-emitting diodes and having a ridge line parallel to the row of the light-emitting diodes, the rod-shaped lens is preliminarily provided on a side wall of the frame body. A linear light source comprising a resin-molded product having a locking projection that fits into a locking part that is provided tightly, and a wing that abuts against the top of the side wall of the frame.
かつ略直線状に棒状レンズの両側面に設けられているこ
とを特徴とする請求項第１項記載の線状光源。2. The linear light source according to claim 1, wherein the locking projections and the wings of the rod-shaped lens are alternately and substantially linearly provided on both side surfaces of the rod-shaped lens.
棒状レンズであって、その棒状レンズの両側部に小さい
突出部からなる係止突起と大きい突出部からなる翼部と
を略一直線状に複数個設け、かつその直線上であって棒
状レンズの略中央部に樹脂注入ゲート処理部を設けた事
を特徴とする線状光源用の棒状レンズ。3. A rod-shaped lens made of a resin-molded product having a substantially semi-cylindrical shape, in which locking protrusions having small protrusions and wings having large protrusions are formed in a substantially straight line on both sides of the rod-shaped lens. A rod-shaped lens for a linear light source, characterized in that a plurality of resin-injection gate processing units are provided on a straight line and substantially in the center of the rod-shaped lens.
し、円弧部の中心より下方の円弧部の半径の1/2より短
い位置に発光ダイオードに対向する略平坦部を有し、そ
の略平坦部を基準にして円弧部の中心の高さと略等しい
かそれより高い位置に前記樹脂注入ゲート処理部を設け
てなる事を特徴とする請求項第３項記載の線状光源用の
棒状レンズ。4. The cross section of the rod-shaped lens has an arc portion on the upper side, and has a substantially flat portion facing the light emitting diode at a position shorter than 1/2 of the radius of the arc portion below the center of the arc portion, 4. The linear light source according to claim 3, wherein the resin injection gate processing portion is provided at a position substantially equal to or higher than the height of the center of the arc portion with reference to the substantially flat portion. Bar lens.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63087911A JP2542900B2 (en) | 1988-04-08 | 1988-04-08 | Linear light source and rod lens |
| US07/335,188 US4941072A (en) | 1988-04-08 | 1989-04-07 | Linear light source |
| KR1019890004675A KR920001820B1 (en) | 1988-04-08 | 1989-04-08 | Line source of light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63087911A JP2542900B2 (en) | 1988-04-08 | 1988-04-08 | Linear light source and rod lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01260706A JPH01260706A (en) | 1989-10-18 |
| JP2542900B2 true JP2542900B2 (en) | 1996-10-09 |
Family
ID=13928100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63087911A Expired - Fee Related JP2542900B2 (en) | 1988-04-08 | 1988-04-08 | Linear light source and rod lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2542900B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100585467C (en) * | 2006-08-09 | 2010-01-27 | 索尼株式会社 | Backlight device, light source device, lens, electronic apparatus and light guide plate |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2012081184A1 (en) | 2010-12-16 | 2014-05-22 | パナソニック株式会社 | Backlight device, liquid crystal display device and lens |
| WO2012081186A1 (en) * | 2010-12-16 | 2012-06-21 | パナソニック株式会社 | Backlight device, liquid-crystal display device, and lens |
| WO2012081187A1 (en) * | 2010-12-16 | 2012-06-21 | パナソニック株式会社 | Backlight device and liquid-crystal display device |
| CN110553157B (en) * | 2018-05-30 | 2023-04-21 | 首尔半导体株式会社 | Light emitting module, window unit for light emitting module and street lamp |
-
1988
- 1988-04-08 JP JP63087911A patent/JP2542900B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100585467C (en) * | 2006-08-09 | 2010-01-27 | 索尼株式会社 | Backlight device, light source device, lens, electronic apparatus and light guide plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01260706A (en) | 1989-10-18 |
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| LAPS | Cancellation because of no payment of annual fees |