JPH0340551B2 - - Google Patents
Info
- Publication number
- JPH0340551B2 JPH0340551B2 JP56027214A JP2721481A JPH0340551B2 JP H0340551 B2 JPH0340551 B2 JP H0340551B2 JP 56027214 A JP56027214 A JP 56027214A JP 2721481 A JP2721481 A JP 2721481A JP H0340551 B2 JPH0340551 B2 JP H0340551B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light emitting
- light source
- linear
- shaped lens
- 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 - Lifetime
Links
- 229920005989 resin Polymers 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 claims 2
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
- Image Input (AREA)
- Facsimile Scanning Arrangements (AREA)
Description
【発明の詳細な説明】
本発明は、発光ダイオードによるライン状光
源、特にフアクシミリ等の読み取り系に用いる小
形かつ信頼性の高いライン状光源に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a line light source using a light emitting diode, and particularly to a small and highly reliable line light source used in a reading system of a facsimile or the like.
従来よりフアクシミリ用光源としては螢光灯を
使用し、原稿面を照射してその反射光をセンサで
受けて光電変換する手段が用いられている。ま
た、複写機等に使用されている光源としては螢光
灯、ハロゲンランプ、キセノンランプ等が用いら
れている。しかしこれらは次のような欠点をもつ
ている。 Conventionally, a fluorescent lamp has been used as a light source for facsimile, and a means has been used in which the surface of the document is irradiated and the reflected light is received by a sensor and photoelectrically converted. In addition, fluorescent lamps, halogen lamps, xenon lamps, and the like are used as light sources for copying machines and the like. However, these have the following drawbacks.
螢光灯、ハロゲンランプは輝度分布が長さ方
向に一様でないので、フアクシミリ、複写機等
の光源として使用できる範囲は長さ方向の中心
を含む1/2程度のものとなる。そのため装置が
大形化してしまう。 Since the luminance distribution of fluorescent lamps and halogen lamps is not uniform in the length direction, the range that can be used as a light source for facsimile machines, copying machines, etc. is about 1/2 including the center in the length direction. This results in an increase in the size of the device.
螢光灯は高圧の点灯回路や安定器が必要であ
ることや、ハロゲンランプは消費電力が大きい
ことなどのために駆動回路が高価である。 Fluorescent lamps require high-voltage lighting circuits and ballasts, and halogen lamps consume a large amount of power, so their drive circuits are expensive.
光源の寿命が短かく途中で交換する必要があ
る。 The light source has a short lifespan and needs to be replaced midway through.
などの欠点をもつている。It has drawbacks such as.
本発明は、これらの欠点を解決するために、発
光ダイオードアレイに反射枠および棒状レンズを
もうけたライン状光源を提供することを目的とし
ており、以下、図面につき詳細に説明する。 In order to solve these drawbacks, the present invention aims to provide a line-shaped light source in which a light emitting diode array is provided with a reflective frame and a rod-shaped lens, and will be described in detail below with reference to the drawings.
第１図は本発明の実施例を示し、１は発光ダイ
オード列を実装したプリント基板、２は反射枠、
３は棒状レンズである。まずプリント基板１上に
複数個の発光ダイオードを直線的に配列させボン
デイングする。反射枠２を固定した後、透明エポ
キシ樹脂にて棒状レンズ３を固定する。前述のよ
うな光源をつくることにより原稿紙面Ｐ上にある
一定幅の均一な帯状光照明面Ｌを得ることができ
る。 FIG. 1 shows an embodiment of the present invention, in which 1 is a printed circuit board on which a light emitting diode array is mounted, 2 is a reflective frame,
3 is a rod-shaped lens. First, a plurality of light emitting diodes are arranged linearly on a printed circuit board 1 and bonded. After fixing the reflective frame 2, a rod-shaped lens 3 is fixed with transparent epoxy resin. By creating the light source as described above, it is possible to obtain a uniform band-shaped light illumination surface L having a certain width on the document surface P.
第２図Ａは第１図図示Ａ−A′線による断面図、
第２図Ｂは第１図図示Ｂ−B′線による断面図で
ある。プリント基板１上の反射枠２は凹面状をし
ており発光ダイオード４をその中心におくと発光
ダイオードの光束は反射枠で反射され能率よく前
方に向う。そして棒状レンズ３により光束は絞ら
れ原稿をある一定幅で照明することになる。棒状
レンズ３はレンズとほぼ同じ屈折率をもつ樹脂５
で固定するようにされる。なお、透明エポキシ樹
脂５はプリント基板１上にボンデイングされた複
数個の発光ダイオード４全体をモールドし、湿
気、ゴミ、ホコリにより発光ダイオード４の劣化
を防いでいる
第３図は棒状レンズを用いる効果を説明するた
めの説明図である。光源からレンズ面迄の距離ａ
を一定にし棒状レンズ３の直径Ｄを変えることに
より焦点距離f0を簡単に変えることができる。そ
れによりレンズ面から照射面迄の距離f1を固定し
照射幅Ｔを自由に調整することが可能となる。ま
たf1の距離を変えることにより照射幅Ｔ及び照射
面照度を自由に変更することができる。 Figure 2A is a sectional view taken along line A-A' in Figure 1;
FIG. 2B is a sectional view taken along line B-B' in FIG. 1. The reflective frame 2 on the printed circuit board 1 has a concave shape, and when the light emitting diode 4 is placed in the center, the light beam of the light emitting diode is reflected by the reflective frame and efficiently directed forward. The light beam is narrowed down by the rod-shaped lens 3 and illuminates the document with a certain width. The rod-shaped lens 3 is made of resin 5 having almost the same refractive index as the lens.
It is fixed in place. Note that the transparent epoxy resin 5 molds the entire plurality of light emitting diodes 4 bonded onto the printed circuit board 1 to prevent deterioration of the light emitting diodes 4 due to moisture, dirt, and dust. Figure 3 shows the effect of using a rod-shaped lens. It is an explanatory diagram for explaining. Distance a from the light source to the lens surface
The focal length f 0 can be easily changed by keeping constant and changing the diameter D of the rod-shaped lens 3. This makes it possible to fix the distance f 1 from the lens surface to the irradiation surface and freely adjust the irradiation width T. Furthermore, by changing the distance f1 , the irradiation width T and the irradiation surface illuminance can be freely changed.
以上説明したように、本発明によれば、発光ダ
イオード列に反射枠と棒状レンズを組合せた光源
であるので、均一で明るい帯状光源をうること
ができる、照射幅、明るさを容易に変更でき
る、構造が簡単なため量産性にすぐれている、
照射長を変更することが容易である、一つの
ライン状光源として一体化したので取扱いが容易
であり、実装後の機械振動等によつて焦点が変化
するなどの不都合もない、などの効果がある。 As explained above, according to the present invention, since the light source is a combination of a light emitting diode array, a reflective frame, and a rod-shaped lens, a uniform and bright strip-shaped light source can be obtained, and the irradiation width and brightness can be easily changed. , has a simple structure and is suitable for mass production.
It is easy to change the irradiation length, it is easy to handle because it is integrated as a single linear light source, and there is no inconvenience such as the focus changing due to mechanical vibration after mounting. be.
このためフアクシミリ読み取り用光源ばかりで
なく複写機用光源、OCR用光源、バーコード読
み取り用光源などへの応用することが可能とな
る。 Therefore, it can be applied not only as a light source for facsimile reading, but also as a light source for copying machines, a light source for OCR, a light source for barcode reading, etc.
第１図および第２図は本発明によるライン状光
源の一実施例を示し、第３図は棒状レンズを用い
る効果を説明する説明図を示す。
図中、１は発光ダイオード列を実装したプリン
ト基板、２は反射枠、３は棒状レンズ、４は発光
ダイオードを表わす。
1 and 2 show an embodiment of the linear light source according to the present invention, and FIG. 3 shows an explanatory diagram illustrating the effect of using a rod-shaped lens. In the figure, 1 represents a printed circuit board on which an array of light emitting diodes is mounted, 2 represents a reflective frame, 3 represents a rod-shaped lens, and 4 represents a light emitting diode.
Claims (1)
脂でモールドした複数の発光ダイオードと、該複
数の発光ダイオード全体を共通に覆つて一体化
し、かつ複数の発光ダイオードの全体に対応して
直線状の開口を有する集光用反射枠と、該集光用
反射枠の上記直線状の開口に対応してもうけられ
た光結像用棒状レンズとを有し、前記光結像用棒
状レンズは前記集光用反射枠の直線状の開口に固
着一体化したことを特徴とする発光ダイオードに
よるライン状光源。1 A plurality of light emitting diodes arranged linearly on a printed circuit board and molded with transparent resin, and a linear light emitting diode that commonly covers and integrates the entire plurality of light emitting diodes and corresponds to the entire plurality of light emitting diodes. It has a light-condensing reflective frame having an aperture, and a light-imaging rod-shaped lens provided corresponding to the linear aperture of the light-condensing reflective frame, and the light-imaging rod-shaped lens A linear light source using a light emitting diode, which is fixed and integrated into a linear opening of a light reflecting frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56027214A JPS57141174A (en) | 1981-02-26 | 1981-02-26 | Linear light source of light emitting diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56027214A JPS57141174A (en) | 1981-02-26 | 1981-02-26 | Linear light source of light emitting diode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57141174A JPS57141174A (en) | 1982-09-01 |
| JPH0340551B2 true JPH0340551B2 (en) | 1991-06-19 |
Family
ID=12214846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56027214A Granted JPS57141174A (en) | 1981-02-26 | 1981-02-26 | Linear light source of light emitting diode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57141174A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5972269A (en) * | 1982-10-18 | 1984-04-24 | Alps Electric Co Ltd | Light emitting diode and information reader using it |
| JPS6083463A (en) * | 1983-10-13 | 1985-05-11 | Nec Corp | Light source for original reading |
| JPH0616363B2 (en) * | 1986-06-27 | 1994-03-02 | 株式会社小糸製作所 | Lighting equipment |
| JPS63314962A (en) * | 1987-06-18 | 1988-12-22 | Fuji Photo Film Co Ltd | Original illuminator |
| US5196950A (en) * | 1988-08-04 | 1993-03-23 | Ricoh Company, Ltd. | Optical reader and light source used for the same |
| JP2011082969A (en) * | 2009-09-10 | 2011-04-21 | Ricoh Co Ltd | Illumination device, image reading apparatus and image forming apparatus |
| US8646941B1 (en) | 2010-06-14 | 2014-02-11 | Humanscale Corporation | Lighting apparatus and method |
-
1981
- 1981-02-26 JP JP56027214A patent/JPS57141174A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57141174A (en) | 1982-09-01 |
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