JPH06318734A - Led line light source - Google Patents

Led line light source

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Publication number
JPH06318734A
JPH06318734A JP10778693A JP10778693A JPH06318734A JP H06318734 A JPH06318734 A JP H06318734A JP 10778693 A JP10778693 A JP 10778693A JP 10778693 A JP10778693 A JP 10778693A JP H06318734 A JPH06318734 A JP H06318734A
Authority
JP
Japan
Prior art keywords
led
light source
resist
chips
substrate
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
JP10778693A
Other languages
Japanese (ja)
Inventor
Masaya Imamura
将也 今村
Original Assignee
Rohm Co Ltd
ローム株式会社
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 Rohm Co Ltd, ローム株式会社 filed Critical Rohm Co Ltd
Priority to JP10778693A priority Critical patent/JPH06318734A/en
Publication of JPH06318734A publication Critical patent/JPH06318734A/en
Application status is Pending legal-status Critical

Links

Abstract

PURPOSE:To lessen a deviation between the illuminances of lights and to realize a reduction in the unit cost of each LED chip and a reduction in the packaging cost of the LED chips by a reduction in the number of pieces of the LED chips by a method wherein a light reflective material is provided between the LED chips. CONSTITUTION:A second resist (a white resist) 13, which is provided on a first resist 16 and is used as a light reflective material, is provided between LED chips 11. Lights, which are emitted from the upper end surfaces of the chips 11, proceed intact over a substrate 10 and at the same time, lights, which are emitted from the side end surfaces of the chips 11, are also reflected by the resist 13 and proceed over the substrate 10. In short, the amount of light toward over the substrate 10 is increased by the existence of the resist 13. Owing to this, the light output characteristics of this LED line light source suppressed the reduction in the output between the chips 11 to the utmost. Accordingly, a uniform illuminance is obtained and a deviation between the illuminances of the lights is also reduced.

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、イメージセンサ、イレーサ、液晶バックライト等に使用されるLEDライン光源に関する。 The present invention relates to an image sensor, an eraser, an LED line light source used in a liquid crystal backlights.

【0002】 [0002]

【従来の技術】イメージセンサや液晶バックライト等に光源として用いられるLEDライン光源は、一般に、基材と、この基材上に設けられた導体パターンと、この導体パターンに一定間隔を置いてライン状に取付けられたLEDチップとを備える。 LED line light source used as a light source of the Related Art Image sensors and liquid crystal backlights, generally, at a substrate, a conductor pattern provided on the substrate, a predetermined distance to the conductor pattern lines and a LED chip mounted on Jo. 例えば、図5(部分上面図) For example, FIG. 5 (partial top view)
及び図6(部分側面図)に示すイメージセンサ用のLE And LE for the image sensor shown in FIG. 6 (partial side view)
Dライン光源では、長尺状の基材20に、LEDチップ21が等間隔で一列に実装されると共に、所定個数のL The D-line light source, the elongated substrate 20 together with the LED chip 21 is mounted in a line at regular intervals, a predetermined number L
EDチップ21毎に電流制御等を行うチップ抵抗器22 Chip resistor 22 for current control and the like for each ED chip 21
が一定間隔で実装されている。 There has been implemented at regular intervals.

【0003】このようなLEDライン光源で得られる光出力は、図7に示すように、LEDチップ21の真上で強くLEDチップ21間で弱い波形状を呈するが、ほぼ平坦になっている。 An optical output obtained with such LED line light source, as shown in FIG. 7, but exhibits a weak wave shape between strong LED chip 21 directly above the LED chip 21, and is substantially flat. しかしながら、図5に示すようなL However, as shown in FIG. 5 L
EDライン光源では、均一な照度を得るためにLEDチップ21間の間隔を少なくしており、必然的にLEDチップ21の個数が多くなる。 The ED line light source, and to reduce the distance between the LED chip 21 in order to obtain a uniform illuminance becomes large number of inevitably LED chip 21. そこで、コスト削減を図るためにLEDチップの個数を減らすことも行われている。 Therefore, it has been made to reduce the number of LED chips in order to reduce costs. 例えばイメージセンサ用光源の場合、LEDチップの個数は、図5のLEDライン光源では約60個であるが、図8のLEDライン光源では約30個と半減しており、更に28個、又は24個や20個に減らすことも試みられている。 For example, in the case of the light source for an image sensor, the number of LED chips, in the LED line light source of FIG. 5 is about 60, the LED line light source of FIG. 8 is halved to about 30, still 28, or 24 It has also been attempted to reduce individual and to 20 pieces.

【0004】 [0004]

【発明が解決しようとする課題】しかし、この場合、図8(部分上面図)及び図9(部分側面図)から分かるように、基材30上でのLEDチップ31間の間隔が大きくなるため、その光出力は図10のようにLEDチップ31間で顕著に低下してしまう。 [0006] However, in this case, FIG. 8 (partial top view) and as can be seen from FIG. 9 (partial side view), the interval between the LED chips 31 on the substrate 30 is increased , the light output would be significantly reduced in between the LED chips 31 as shown in FIG. 10. この結果、照度が不均一になり、照度偏差が大きくなる。 As a result, the illuminance becomes uneven illuminance deviation increases. 但し、照度偏差は、 However, the illuminance deviation,
〔(出力MAX−出力MIN)/(出力MAX+出力M [(Output MAX- output MIN) / (output MAX + output M
IN)〕×100(%)で計算する。 IN)] × calculated by 100 (%).

【0005】この問題点は、コスト削減のためにはLE [0005] This problem is for cost reduction LE
Dチップの個数を減らすことが最も有効である以上は止むを得ず、イメージセンサの光出力特性等を適宜落として、機器(FAX等)側で補正を行ったりして、上記問題点に対処している。 D chip unavoidably above is most effective to reduce the number of, drop the optical output characteristics of the image sensor or the like as appropriate, and or perform correction with equipment (FAX, etc.) side, addresses the above problems doing. しかし、照度低下に対してはイメージセンサの出力ゲインを上げることで或る程度対応できるが、照度偏差に関しては補正することが不可能であり、照度偏差対策は全く取られていないのが現状である。 However, although some degree may be dealt with by increasing the output gain of the image sensor relative to the illumination intensity, it is impossible to correct with respect to the illuminance difference in reality is the illuminance deviation measures are not at all taken is there.

【0006】従って、本発明の目的は、光出力特性が良好で安価なLEDライン光源を提供することにある。 It is therefore an object of the present invention is that the light output characteristics provide a good and inexpensive LED line light source.

【0007】 [0007]

【課題を解決するための手段】前記目的を達成するために、本発明のLEDライン光源は、従来のLEDライン光源において、LEDチップ間に光反射材を設けたことを特徴とする。 To SUMMARY OF THE INVENTION To achieve the above object, LED line light source of the present invention, in the conventional LED line light source, characterized in that a light reflecting material between LED chips.

【0008】 [0008]

【作用】この構成により、LEDチップの上端面から出射する光は従来通りに進行するが、LEDチップの側端面から出射する光がチップ間の光反射材によって反射され、基材上方に進行する。 [Action] With this configuration, light emitted from the upper end surface of the LED chip can proceed conventionally, the light emitted from the side end surface of the LED chip is reflected by the light reflecting material between chips proceed to a substrate upward . このため、LEDチップ間の光出力が増大し、結果的に照度が均一になり、照度偏差が少なくなる。 Therefore, the light output between the LED chips is increased, resulting in illuminance becomes uniform, the illuminance deviation is reduced.

【0009】なお、光反射材としては、光反射率が大きい材質であればよく、白レジスト、アルミ蒸着、メッキが例示される。 [0009] As the light-reflecting material may be a light reflectance greater material, white resist, aluminum deposition, plating and the like.

【0010】 [0010]

【実施例】以下、本発明のLEDライン光源を実施例に基づいて説明する。 EXAMPLES The following will be described based on examples of the LED line light source of the present invention. 図1に、一実施例に係る光源の部分上面図を、図2に部分側面図を、図4に図1の線A−A 1, a partial top view of a light source according to an embodiment, a partial side view in FIG. 2, line A-A of FIG. 1 in FIG. 4
における部分断面図を示す。 Shows a partial cross-sectional view taken along. このLEDライン光源は、 The LED line light source,
従来と対比し易くするために図8に示す従来の光源と同様構造のものであり、光反射材を設けた点のみが異なる。 Is of similar construction as the conventional light source shown in FIG. 8 for ease of comparison with the prior art only in that provided a light reflecting material is different.

【0011】このLEDライン光源は、基材(基板)1 [0011] The LED line light source comprises a substrate (substrate) 1
0と、基材10に形成された導体パターン15と、導体パターン15に取付けられたLEDチップ11及びチップ抵抗器12と、導体パターン15上の、LEDチップ11及びチップ抵抗器12以外の部分に施された絶縁層としての第1レジスト16と、LEDチップ11間にて第1レジスト16上に設けられた光反射材としての第2 0, a conductor pattern 15 formed on the substrate 10, the LED chip 11 and the chip resistor 12 mounted on the conductor pattern 15, on the conductor pattern 15, the LED chip 11 and a portion other than the chip resistor 12 a first resist 16 as an insulating layer applied, first in between the LED chip 11 as the light reflecting material provided on the first resist 16 2
レジスト(ここでは白レジスト)13とを備える。 Resist (in this case white resist) and a 13.

【0012】所定個数のLEDチップ11は、基材10 [0012] LED chip 11 of the predetermined number, the base material 10
の長手方向に等間隔でライン状に並んでおり、それぞれ導体パターン15に電気的に接続されている。 Longitudinally and equally spaced in a line shape, it is respectively electrically connected to the conductor pattern 15. 白レジスト13は、LEDチップ11間にて基材10の横断方向に延びている。 White resist 13 extends in the transverse direction of the base 10 in between the LED chip 11. 又、チップ抵抗器12は、所定個数のL The chip resistor 12, a predetermined number L
EDチップ11毎に電流制御等を行うためのものである。 It is for performing a current control, etc. for each ED chip 11.

【0013】このように構成したLEDライン光源では、LEDチップ11の上端面から出射する光は、そのまま基材10の上方に進行すると共に、LEDチップ1 [0013] In thus constituted LED line light source, light emitted from the upper end surface of the LED chip 11 is configured to proceed directly above the substrate 10, LED chips 1
1の側端面から出射する光も、白レジスト13で反射されて基材10の上方に進む。 Light emitted from the first side edge is also reflected by the white resist 13 advances over the substrate 10. つまり、白レジスト13の存在により、基材10の上方への光量が増加することになる。 In other words, the presence of white resist 13, so that the amount of upward of the base 10 is increased. このため、この光源の光出力特性は、図3に示すようにLEDチップ11間での出力低下が極力抑えられたものになり、光反射材を設けない従来の光源の光出力特性(図10参照)に比べて相当改善される。 Therefore, the light output characteristics of the light source will become that output drop in between the LED chips 11 is suppressed as much as possible as shown in FIG. 3, the light output characteristics of the conventional light source without the light reflecting material (FIG. 10 is significantly improved compared to the reference). 従って、 Therefore,
均一な照度が得られ、照度偏差も大幅に少なくなる。 Uniform illuminance can be obtained, also significantly reduced illuminance deviation.

【0014】なお、光反射材13は、LEDチップ11 [0014] The light reflective material 13, LED chips 11
やチップ抵抗器12を実装する前に、予め第1レジスト16上の所定部分に設けておくのが、光源製作上望ましい。 And prior to mounting the chip resistor 12, the preferably provided in a predetermined portion of the advance on the first resist 16, the light source manufactured desirable. 又、光反射材は、上記実施例に示したパターン(図1の斜線部分参照)に限定されるものではなく、予めL The light reflective material is not limited to the pattern shown (see the hatched portion in FIG. 1) in the above examples, pre-L
EDチップの個数と照度及びその偏差との関係を実験等により求めておき、所望とする光出力特性に応じたパターンで基材上に設けるのが好ましい。 The relationship between the number of ED chip and illuminance and the deviation advance determined by experiments or the like is preferably provided on the substrate in a pattern corresponding to the light output characteristics desired. 例えば、長尺状の基材の両端部に行くに従い光出力を大きくしたい場合には、基材の中央部よりも端部ほど光反射材の幅を大きくするなどして、光反射材の面積を増やしてやればよい。 For example, when it is desired to increase the light output as it goes to the both ends of the elongated substrate, such as by increasing the width of about end light-reflecting material than the central portion of the substrate, the area of ​​the light reflecting material the may do it to increase.

【0015】 [0015]

【発明の効果】以上説明したように、本発明のLEDライン光源は、LEDチップ間に光反射材を設けたため、 As described above, according to the present invention, LED line light source of the present invention, due to the provision of the light reflecting material between the LED chip,
下記の効果を有する。 It has the following effects. (1)照度偏差を少なくすることができるため、LED (1) it is possible to reduce the illuminance deviation, LED
チップ個数の低減によるチップ単価の削減や実装費の削減を実現でき、光源全体のコストが低くなる。 Can achieve reduction reduction reduction and implementation costs of the chip unit price by the chip number, the total cost of the light source is low. (2)光源を照射対象物に近付けて配置することが可能となり、この光源を組み込む各種機器を小型化できる。 (2) light source can be disposed close to the irradiation object can be downsized various devices incorporating the light source.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】一実施例に係る光源の部分上面図である。 1 is a partial top view of a light source according to an embodiment.

【図2】図1に示す光源の部分側面図である。 It is a partial side view of the light source shown in FIG. 1. FIG.

【図3】図1に示す光源で得られる光出力特性を示す図である。 3 is a diagram illustrating an optical output characteristic obtained by the light source shown in FIG.

【図4】図1に示す光源の線A−Aにおける部分断面図である。 4 is a partial cross-sectional view taken along the line A-A of the light source shown in FIG.

【図5】従来例に係る光源の部分上面図である。 5 is a partial top view of a light source according to a conventional example.

【図6】図5に示す光源の部分側面図である。 6 is a partial side view of the light source shown in FIG.

【図7】図5に示す光源で得られる光出力特性を示す図である。 7 is a diagram illustrating an optical output characteristic obtained by the light source shown in FIG.

【図8】別の従来例に係る光源の部分上面図である。 It is a partial top view of a light source according to Figure 8 another conventional example.

【図9】図8に示す光源の部分側面図である。 9 is a partial side view of the light source shown in FIG.

【図10】図8に示す光源で得られる光出力特性を示す図である。 10 is a diagram illustrating an optical output characteristic obtained by the light source shown in FIG.

【符号の説明】 DESCRIPTION OF SYMBOLS

10 基材 11 LEDチップ 12 チップ抵抗器 13 第2レジスト(光反射材) 15 導体パターン 16 第1レジスト 10 Substrate 11 LED chip 12 chip resistor 13 second resist (light reflecting material) 15 conductor pattern 16 first resist

───────────────────────────────────────────────────── 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 B41J 2/455 G02F 1/1335 530 7408−2K ────────────────────────────────────────────────── ─── front page continued (51) Int.Cl. 5 identification symbol Agency Docket No. FI art display portion B41J 2/455 G02F 1/1335 530 7408-2K

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】基材と、この基材上に設けられた導体パターンと、この導体パターンに一定間隔を置いてライン状に取付けられたLEDチップとを備えるLEDライン光源において、前記LEDチップ間に光反射材を設けたことを特徴とするLEDライン光源。 And 1. A substrate, a conductor pattern provided on the substrate, the LED line light source and a LED chip mounted in a line at regular intervals in the conductor pattern, between the LED chip LED line light source, characterized in that a light reflecting material.
JP10778693A 1993-05-10 1993-05-10 Led line light source Pending JPH06318734A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10778693A JPH06318734A (en) 1993-05-10 1993-05-10 Led line light source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10778693A JPH06318734A (en) 1993-05-10 1993-05-10 Led line light source

Publications (1)

Publication Number Publication Date
JPH06318734A true JPH06318734A (en) 1994-11-15

Family

ID=14467995

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10778693A Pending JPH06318734A (en) 1993-05-10 1993-05-10 Led line light source

Country Status (1)

Country Link
JP (1) JPH06318734A (en)

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US8833987B2 (en) 2005-09-14 2014-09-16 Donnelly Corporation Mirror reflective element sub-assembly for exterior rearview mirror of a vehicle
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