JP2006085975A - Bar shape light guide, lighting unit, and image reading device - Google Patents

Bar shape light guide, lighting unit, and image reading device Download PDF

Info

Publication number
JP2006085975A
JP2006085975A JP2004268193A JP2004268193A JP2006085975A JP 2006085975 A JP2006085975 A JP 2006085975A JP 2004268193 A JP2004268193 A JP 2004268193A JP 2004268193 A JP2004268193 A JP 2004268193A JP 2006085975 A JP2006085975 A JP 2006085975A
Authority
JP
Japan
Prior art keywords
light guide
rod
light
shape
shaped light
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.)
Withdrawn
Application number
JP2004268193A
Other languages
Japanese (ja)
Inventor
Tomihisa Saito
富久 斉藤
Hiroyuki Nemoto
浩之 根本
Makoto Ikeda
誠 池田
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.)
Nippon Sheet Glass Co Ltd
Original Assignee
Nippon Sheet Glass 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 Nippon Sheet Glass Co Ltd filed Critical Nippon Sheet Glass Co Ltd
Priority to JP2004268193A priority Critical patent/JP2006085975A/en
Priority to TW094131325A priority patent/TW200622326A/en
Priority to US11/227,999 priority patent/US7308187B2/en
Priority to CN 200510106768 priority patent/CN1750585A/en
Publication of JP2006085975A publication Critical patent/JP2006085975A/en
Withdrawn legal-status Critical Current

Links

Landscapes

  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Planar Illumination Modules (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Facsimile Heads (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rod-shape light guide in which the illuminance of light emitted from an emitting face formed along the longitudinal direction is uniform. <P>SOLUTION: The rod-shape light guide 12 exposes the emitting face 12a from a white case 11 and has a pattern 14 for diffusing and reflecting light at the bottom face opposed to the emitting face. The pattern 14 is formed of white paint or a fine concavo-convex. Further, the end face 15 on the opposite side to the incident side of the rod-shape light guide 12 is made into a cube corner reflector shape. That is, the end face 15 is made into a mountain shape by mirror-finished flat surfaces 15a, 15b, and the flat surfaces 15a, 15b are inclined to an angle in which the incident angle θ of the light which has advanced in parallel with the longitudinal direction of the rod-shape light guide 12 in the light guide 12 becomes smaller than a critical angle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、一端面から入射した光線を長手方向に沿って設けた出射面から出射する棒状導光体、この導光体と発光源とを組み合わせた照明ユニット、この照明ユニットを組み込んだ画像読取装置に関する。   The present invention relates to a rod-shaped light guide that emits light incident from one end face from an emission surface provided along the longitudinal direction, an illumination unit that combines the light guide and a light source, and an image reading unit incorporating the illumination unit. Relates to the device.

ファクシミリ、複写機、スキャナ装置等の画像読取装置の一部に用いられる棒状導光体には、ＬＥＤなどの発光ユニットを棒状導光体の一端側にのみ配置したものが多い。このように一端側のみに発光ユニットを配した場合には発光ユニットの数が少なくなり発熱の問題やコスト的には有利になるが、出射面からムラなくしかも照度低下なく光を出射させるための工夫が必要になる。   Many rod-shaped light guides used in a part of an image reading apparatus such as a facsimile, a copying machine, and a scanner device have a light emitting unit such as an LED arranged only on one end side of the rod-shaped light guide. In this way, when the light emitting units are arranged only on one end side, the number of the light emitting units is reduced, which is advantageous in terms of heat generation and cost. Ingenuity is required.

そこで、特許文献１には、入射端面とは反対側の端面を鏡面とし、この反対側の端面の外側に反射効率の高い部材を配置することで、一端面側から入射し導光体内部を進んで反対側の端面まで到達した光を入射側に向かって反射せしめ、これを繰り返すことで入射光線を全て光散乱パターンからの照射光として消費し尽くすことが開示されている。   Therefore, in Patent Document 1, the end surface opposite to the incident end surface is used as a mirror surface, and a member having high reflection efficiency is disposed outside the opposite end surface, so that the light is incident from one end surface side and the inside of the light guide is inside. It is disclosed that the light that has reached the end surface on the opposite side is reflected toward the incident side, and by repeating this, all incident light is consumed as irradiation light from the light scattering pattern.

特許文献２には、入射端面とは反対側の端面を切断面をそのまま用いた粗面として製作コストを下げる一方、この端面に近い部分の光散乱パターンを幅広とすることで、入射光線の大部分が前記反対側の端面に到達するまでに散乱光として消費することが開示されている。   In Patent Document 2, the end face opposite to the incident end face is a rough face using the cut face as it is, and the manufacturing cost is reduced. On the other hand, the light scattering pattern near the end face is widened to increase the incident light. It is disclosed that the portion is consumed as scattered light before reaching the opposite end face.

特許文献３には、入射端面とは反対側の端面に白色塗料を塗ることで、当該端面まで到達した光を散乱させることが開示されている。また、棒状導光体とは関連性のない技術分野であるが、特許文献４には、再帰反射させるためのコーナキューブタイプの反射鏡が開示されている。
特開平８−１６３３２０号公報 特開平１０−１２６５８１号公報 特開平１１−８４５４４号公報 特許第２９５４７０９号公報 Patent Document 3 discloses that light reaching the end surface is scattered by applying a white paint on the end surface opposite to the incident end surface. Further, although it is a technical field unrelated to the rod-shaped light guide, Patent Document 4 discloses a corner cube type reflecting mirror for retroreflection.
JP-A-8-163320 Japanese Patent Laid-Open No. 10-126581 Japanese Patent Laid-Open No. 11-84544 Japanese Patent No. 2954709

上述した導光体は白色のケースに出射面が露出するように収められて画像読取装置内にセットされる。また導光体の材料としては透明度の高いアクリル樹脂が用いられ、ケースの材料としては低価格の樹脂が用いられる。   The above-described light guide is housed in a white case so that the exit surface is exposed and set in the image reading apparatus. A highly transparent acrylic resin is used as the material of the light guide, and a low-cost resin is used as the material of the case.

また、ファクシミリ、複写機、スキャナ装置等の画像読取装置は、輸送時、保管時などに高温になることがあるので導光体をケースに収めるにあたっては、熱膨張差を考慮する必要がある。しかしながら、ライン照明装置が高温に放置された後に冷却されると上記材料の違いから導光体の方の収縮率が大きく、導光体の端面特に発光ユニットを設けた側と反対側の端面とケース内面との間に隙間が形成される。また熱膨張率の差以外にも製作誤差などによって隙間は生じやすい。   In addition, since image reading apparatuses such as facsimiles, copying machines, and scanners may become hot during transportation and storage, it is necessary to consider the difference in thermal expansion when placing the light guide in the case. However, when the line illumination device is cooled after being left at a high temperature, the shrinkage rate of the light guide is larger due to the difference in the above materials, and the end surface of the light guide, particularly the end surface opposite to the side where the light emitting unit is provided, A gap is formed between the inner surface of the case. In addition to the difference in thermal expansion coefficient, gaps are likely to occur due to manufacturing errors.

このように隙間が形成されると、隙間がない状態では反射して一端側に戻っていた光が反対側の端面で反射せずに透過し、ケース内面で散乱し、この散乱した光が反対側の端面近傍から出射する。このため、反対側の端面近傍が他の箇所に比べて照度が異常に高くなる。この傾向は特許文献１に開示されるような発光ユニットと反対側の端面を鏡面とした場合に顕著である。   When the gap is formed in this way, the light that has been reflected and returned to the one end side is transmitted without being reflected by the opposite end face and scattered by the inner surface of the case, and the scattered light is opposite. The light is emitted from the vicinity of the end face on the side. For this reason, the illuminance is abnormally higher in the vicinity of the opposite end face than in other locations. This tendency is remarkable when the end surface opposite to the light emitting unit as disclosed in Patent Document 1 is a mirror surface.

また、特許文献２及び特許文献３に開示される構成では照明効率が悪くなる。   In addition, the configurations disclosed in Patent Document 2 and Patent Document 3 have poor illumination efficiency.

上記課題を解決するため第１発明に係る棒状導光体は、一端面から入射した光線を内面で反射させて長手方向に沿って設けられた出射面から出射する棒状導光体において、この導光体の入射面とは反対側の端面は、導光体内を長手方向と平行に進んできた光線が前記一端面に向かって全反射するコーナキューブ形状とした。   In order to solve the above problems, a rod-shaped light guide according to a first aspect of the present invention is a rod-shaped light guide that reflects light incident from one end surface on the inner surface and emits the light from an exit surface provided along the longitudinal direction. The end surface of the light body opposite to the incident surface has a corner cube shape in which the light beam that has traveled in the light guide parallel to the longitudinal direction is totally reflected toward the one end surface.

ここで、コーナキューブ形状は前記特許文献４に示されるように入射光線を発光源に向かって再帰反射させることができる形状であり、具体的には、山形形状、角錐形状または円錐形状が考えられる。尚、本発明の場合はコーナキューブ形状を構成する面が鏡面仕上げされていることが必要である。   Here, the corner cube shape is a shape capable of retroreflecting incident light rays toward the light emitting source as shown in Patent Document 4, and specifically, a mountain shape, a pyramid shape, or a cone shape can be considered. . In the case of the present invention, the surfaces constituting the corner cube shape must be mirror-finished.

また、第２発明に係る棒状導光体は、一端面から入射した光線を内面で反射させて長手方向に沿って設けられた出射面から出射する棒状導光体において、この導光体は入射面とは反対側の端部を除いて出射面が露出するようにケース内に収納され、また前記入射面とは反対側の端面を覆うキャップが前記ケースとは別体として取り付けられている。   The rod-shaped light guide according to the second aspect of the invention is a rod-shaped light guide that reflects light incident from one end surface on the inner surface and emits the light from an emission surface provided along the longitudinal direction. A cap that covers the end surface opposite to the incident surface is attached as a separate body from the case so that the exit surface is exposed except for the end opposite to the surface.

この第２発明の具体的な構成としては、前記キャップを取り付けた導光体端部がケースから食み出るか、または前記キャップを取り付けた状態の導光体全体がケース内に収められている構成が挙げられる。   As a specific configuration of the second invention, the end portion of the light guide body with the cap attached protrudes from the case, or the entire light guide body with the cap attached is housed in the case. A configuration is mentioned.

更に本発明に係る照明ユニットは前記棒状導光体の一端側に発光源を取り付けたものであり、また本発明に係る画像読取装置は、前記照明ユニットと、光電変換素子からなるラインイメージセンサと、前記照明ユニットからの照射光のうち原稿からの反射光を前記ラインイメージセンサに向けて集光せしめる正立等倍結像系とを備えている。   Furthermore, the illumination unit according to the present invention has a light source attached to one end side of the rod-shaped light guide, and the image reading apparatus according to the present invention includes the illumination unit, a line image sensor including a photoelectric conversion element, And an erecting equal-magnification imaging system for condensing the reflected light from the original of the irradiation light from the illumination unit toward the line image sensor.

第１発明に係る棒状導光体によれば、長手方向に沿って設けた出射面からの照度を均一にすることができる。特に一端側のみに発光ユニットを配置した従来の導光体にあっては、温度変化による収縮が原因で、発光ユニットを設けた端部とは反対側の端部における照度が異常に高くなる傾向があったが、本発明によれば反対側の端部まで進んできた照射光はそこで散乱せずに再び一端側に向かって戻るため、導光体の底面などに設けた光散乱パターンで長手方向において均一に散乱する。   According to the rod-shaped light guide according to the first invention, the illuminance from the exit surface provided along the longitudinal direction can be made uniform. In particular, in a conventional light guide in which a light emitting unit is arranged only at one end, the illuminance at the end opposite to the end where the light emitting unit is provided tends to be abnormally high due to shrinkage due to temperature change. However, according to the present invention, the irradiation light that has traveled to the opposite end portion returns to the one end side again without being scattered there, so that the light scattering pattern provided on the bottom surface of the light guide and the like is long. Scatters uniformly in the direction.

また、第２発明に係る棒状導光体によれば、温度変化が生じても、棒状導光体の端面とケースとの間に隙間は形成されないため、発光ユニットと反対側の端面での照度が極端に高くなることを防ぐことができる。   Further, according to the rod-shaped light guide according to the second invention, no gap is formed between the end surface of the rod-shaped light guide and the case even if the temperature changes, so that the illuminance at the end surface opposite to the light emitting unit Can be prevented from becoming extremely high.

以下に本発明の実施の形態を添付図面に基づいて説明する。図１は本発明に係る棒状導光体を組み込んだ画像読取装置の断面図であり、画像読取装置はフレーム１に形成した凹部１ａにライン状の照明ユニット１０を配置し、底部には光電変換素子（ラインイメージセンサ）２を備えたセンサ基板３を取り付け、更にフレーム１の中央部に照明ユニット１０からの照射光のうち原稿からの反射光を前記光電変換素子２に向けて集光せしめる等倍結像用のレンズアレイ４を取付け、照明ユニット１０から出射した照明光を、原稿台を通して原稿に照射し、その反射光をレンズアレイ４を介してラインイメージセンサ２にて検出することで原稿を読み取る。尚、図示例では照明ユニット１０を１つのみとしているが、一対設けてもよい。   Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of an image reading apparatus incorporating a rod-shaped light guide according to the present invention. In the image reading apparatus, a linear illumination unit 10 is disposed in a recess 1a formed in a frame 1, and photoelectric conversion is performed at the bottom. A sensor substrate 3 having an element (line image sensor) 2 is attached, and the reflected light from the document out of the light emitted from the illumination unit 10 is condensed toward the photoelectric conversion element 2 at the center of the frame 1. A lens array 4 for double imaging is attached, the illumination light emitted from the illumination unit 10 is irradiated onto the document through the document table, and the reflected light is detected by the line image sensor 2 through the lens array 4, thereby the document. Read. In the illustrated example, only one lighting unit 10 is provided, but a pair may be provided.

前記レンズアレイ４としてはロッド状のレンズアレイを用いているが、レンズプレートを複数枚重ねて正立等倍レンズとして構成し、各レンズプレートには多数の微小レンズが所定ピッチで規則的に２次元状に配列したレンズアレイを用いてもよい。   A rod-shaped lens array is used as the lens array 4, but a plurality of lens plates are stacked to form an erecting equal-magnification lens, and each lens plate has a large number of minute lenses regularly 2 at a predetermined pitch. A lens array arranged in a dimension may be used.

図２は前記照明ユニット１０の全体図、図３は同照明ユニット１０の分解斜視図であり、照明ユニット１０は、白色ケース１１内にアクリル樹脂などの透明樹脂を射出成形して得られる棒状導光体１２を納めるとともに、一端に発光ユニット１３を取り付けている。この発光ユニット１３は樹脂プレートに３原色のＬＥＤを保持してなり、３原色の各ＬＥＤは棒状導光体１２の底面の法線上に位置している。   2 is an overall view of the illumination unit 10, and FIG. 3 is an exploded perspective view of the illumination unit 10. The illumination unit 10 is a rod-shaped guide obtained by injection molding a transparent resin such as acrylic resin in a white case 11. The light body 12 is accommodated, and a light emitting unit 13 is attached to one end. The light emitting unit 13 holds LEDs of three primary colors on a resin plate, and each of the three primary color LEDs is located on the normal line of the bottom surface of the rod-shaped light guide 12.

棒状導光体１２は出射面１２ａを白色ケース１１から露出せしめるとともにこの出射面と対向する底面に光を散乱／反射せしめるパターン１４を設けている。このパターン１４は白色塗料若しくは微細な凹凸から形成される。   The rod-shaped light guide 12 is provided with a pattern 14 that exposes the emission surface 12a from the white case 11 and scatters / reflects light on the bottom surface facing the emission surface. The pattern 14 is formed from a white paint or fine unevenness.

更に、棒状導光体１２の入射側とは反対側の端面１５はコーナキューブ形状とされている。即ち図４に示すように端面１５は鏡面仕上げされた平面１５ａ、１５ｂにて山形形状とされ、これら平面１５ａ、１５ｂの傾斜角は、棒状導光体１２内を棒状導光体１２の長手方向と平行に進んできた光線の入射角θが臨界角よりも小さくなる角度に傾斜している。例えば、平面１５ａと平面１５ｂとが９０°をなすように成形する。   Furthermore, the end face 15 on the opposite side to the incident side of the rod-shaped light guide 12 has a corner cube shape. That is, as shown in FIG. 4, the end face 15 is formed into a mountain shape with mirror-finished planes 15 a and 15 b, and the inclination angle of the planes 15 a and 15 b is the longitudinal direction of the rod-shaped light guide 12 in the rod-shaped light guide 12. The incident angle θ of the light beam that has traveled parallel to the angle is inclined to an angle that is smaller than the critical angle. For example, it shape | molds so that the plane 15a and the plane 15b may make 90 degrees.

図５（ａ）乃至（ｃ）は別実施例に係る導光体の端部を示す図端面形状を示す図であり、（ａ）に示す実施例は、端面１５を四角錐形状とし、（ｂ）に示す実施例は、端面１５を円錐形状とし、（ｃ）に示す実施例は、端面１５を多数の山形形状で構成している。このように端面１５の形状は種々考えられるが、端面１５は何れも鏡面仕上げされ、端面１５まで到達した光線が全反射して再び一端側に戻る形状であればよい。   FIGS. 5A to 5C are diagrams showing the end face shape of the light guide according to another embodiment. In the embodiment shown in FIG. 5A, the end face 15 has a quadrangular pyramid shape. In the embodiment shown in b), the end face 15 has a conical shape, and in the embodiment shown in (c), the end face 15 has a large number of chevron shapes. As described above, various shapes of the end face 15 are conceivable, but any end face 15 may be mirror-finished so long as the light reaching the end face 15 is totally reflected and returns to the one end side again.

図６は第２発明に係る導光体を組み込んだ照明ユニットの端部を示す図であり、この第２発明では、棒状導光体１２の入射側とは反対側の端部に係止部１６を形成し、この係止部１６にキャップ１７を係止しキャップ１７で端面１５を覆っている。キャップ１７は白色樹脂からなるか或いは内面に反射層１８を設け、この反射層１８が鏡面仕上げされた端面１５に密着している。   FIG. 6 is a view showing an end portion of an illumination unit incorporating a light guide according to the second invention. In this second invention, a locking portion is provided at the end of the rod-shaped light guide 12 opposite to the incident side. 16 is formed, and a cap 17 is locked to the locking portion 16 and the end surface 15 is covered with the cap 17. The cap 17 is made of white resin or provided with a reflection layer 18 on the inner surface, and the reflection layer 18 is in close contact with the mirror-finished end surface 15.

更に、棒状導光体１２を収納したケース１１の端部と前記キャップ１７間には隙間１９が形成されている。この隙間は照明ユニット１０が高温に曝された後に冷却する際にケース１１よりも棒状導光体１２の収縮率が大きい場合に、キャップ１７がケース１１に強く押し付けられるのを防ぐためのものである。   Further, a gap 19 is formed between the end of the case 11 housing the rod-shaped light guide 12 and the cap 17. This gap is for preventing the cap 17 from being strongly pressed against the case 11 when the lighting unit 10 is cooled after being exposed to a high temperature and when the contraction rate of the rod-shaped light guide 12 is larger than that of the case 11. is there.

図７は第２発明の別実施例を示す図であり、この実施例にあってはケース１１内にキャップ１７も収めるようにしている。この場合に冷却によって棒状導光体１２の長さが短くなっても、棒状導光体１２の端部にはキャップ１７が固着されているので、従来のように棒状導光体の端面とケース内面との間に隙間が生じ、この隙間で光が乱反射し端部での照度が異常に高くなる不利を防止できる。   FIG. 7 is a view showing another embodiment of the second invention. In this embodiment, the cap 17 is also housed in the case 11. In this case, even if the length of the rod-shaped light guide 12 is shortened by cooling, the cap 17 is fixed to the end portion of the rod-shaped light guide 12. It is possible to prevent a disadvantage that a gap is formed between the inner surface and light is diffusely reflected in the gap and the illuminance at the end is abnormally high.

本発明に係る棒状導光体は、コピー機、ファクシミリ等の画像読取装置として有効に利用される。   The rod-shaped light guide according to the present invention is effectively used as an image reading apparatus such as a copying machine or a facsimile.

本発明に係る棒状導光体を組み込んだ画像読取装置の断面図Sectional drawing of the image reading apparatus incorporating the rod-shaped light guide which concerns on this invention 第１発明に係る棒状導光体を組み込んだ照明ユニットの全体図Overall view of an illumination unit incorporating a rod-shaped light guide according to the first invention 同照明ユニットの分解斜視図Exploded perspective view of the lighting unit 棒状導光体のコーナキューブ形状をなす端部の拡大図Enlarged view of the corner cube-shaped end of the rod-shaped light guide （ａ）〜（ｃ）は別実施例に係る棒状導光体の端部を示す図(A)-(c) is a figure which shows the edge part of the rod-shaped light guide which concerns on another Example. 第２発明に係る導光体を組み込んだ照明ユニットの端部を示す図The figure which shows the edge part of the illumination unit incorporating the light guide which concerns on 2nd invention. 第２発明の別実施例を示す図The figure which shows another Example of 2nd invention

符号の説明Explanation of symbols

１…フレーム、１ａ…凹部、２…光電変換素子（ラインイメージセンサ）、３…センサ基板、４…レンズアレイ、１０…照明ユニット、１１…白色ケース、１２…棒状導光体、１２ａ…出射面、１３…発光ユニット、１４…光散乱パターン、１５…端面、１５ａ，１５ｂ…端面を構成する平面、１６…係止部、１７…キャップ、１８…反射層、１９…隙間。   DESCRIPTION OF SYMBOLS 1 ... Frame, 1a ... Concave part, 2 ... Photoelectric conversion element (line image sensor), 3 ... Sensor substrate, 4 ... Lens array, 10 ... Illumination unit, 11 ... White case, 12 ... Bar-shaped light guide, 12a ... Output surface , 13 ... light emitting unit, 14 ... light scattering pattern, 15 ... end face, 15a, 15b ... plane constituting the end face, 16 ... locking portion, 17 ... cap, 18 ... reflective layer, 19 ... gap.

Claims (6)

一端面から入射した光線を内面で反射させて長手方向に沿って設けられた出射面から出射する棒状導光体において、この導光体の入射面とは反対側の端面は、導光体内を長手方向と平行に進んできた光線が前記一端面に向かって全反射するコーナキューブ形状とされていることを特徴とする棒状導光体。 In the rod-shaped light guide that reflects the light incident from one end surface on the inner surface and emits the light from the exit surface provided along the longitudinal direction, the end surface opposite to the entrance surface of the light guide is inside the light guide. A rod-shaped light guide having a corner cube shape in which a light beam traveling parallel to the longitudinal direction is totally reflected toward the one end face. 請求項１に記載の棒状導光体において、前記コーナキューブ形状は鏡面仕上げされた山形形状、角錐形状または円錐形状をなすことを特徴とする棒状導光体。 2. The rod-shaped light guide according to claim 1, wherein the corner cube shape has a mirror-finished mountain shape, a pyramid shape, or a cone shape. 一端面から入射した光線を内面で反射させて長手方向に沿って設けられた出射面から出射する棒状導光体において、この導光体は入射面とは反対側の端部を除いて出射面が露出するようにケース内に収納され、また前記入射面とは反対側の端面を覆うキャップが前記ケースとは別体として取り付けられていることを特徴とする棒状導光体。 In a rod-shaped light guide that reflects light incident from one end surface on the inner surface and emits the light from an exit surface provided along the longitudinal direction, the light guide has an exit surface except for an end opposite to the entrance surface. A rod-shaped light guide, wherein the cap is housed in the case so as to be exposed, and a cap that covers the end surface opposite to the incident surface is attached separately from the case. 請求項３に記載の棒状導光体において、前記キャップを取り付けた導光体端部がケースから食み出るか、または前記キャップを取り付けた状態の導光体全体がケース内に収められていることを特徴とする棒状導光体。 The rod-shaped light guide according to claim 3, wherein the end of the light guide attached with the cap protrudes from the case, or the entire light guide with the cap attached is accommodated in the case. A rod-shaped light guide characterized by that. 請求項１乃至請求項４に記載の棒状導光体の一端側に発光源を取り付けたことを特徴とする照明ユニット。 An illumination unit comprising a light source attached to one end of the rod-shaped light guide according to claim 1. 請求項５に記載の照明ユニットと、光電変換素子からなるラインイメージセンサと、前記照明ユニットからの照射光のうち原稿からの反射光を前記ラインイメージセンサに向けて集光せしめる正立等倍結像系とを備えた画像読取装置。

An illumination unit according to claim 5, a line image sensor comprising a photoelectric conversion element, and an erecting equal magnification for condensing reflected light from a document out of irradiation light from the illumination unit toward the line image sensor. An image reading apparatus comprising an image system.

JP2004268193A 2004-09-15 2004-09-15 Bar shape light guide, lighting unit, and image reading device Withdrawn JP2006085975A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2004268193A JP2006085975A (en) 2004-09-15 2004-09-15 Bar shape light guide, lighting unit, and image reading device
TW094131325A TW200622326A (en) 2004-09-15 2005-09-12 Bar-shaped light guide, illumination unit and image-scannig device
US11/227,999 US7308187B2 (en) 2004-09-15 2005-09-15 Bar-shaped light guide, illumination unit and image-scanning device
CN 200510106768 CN1750585A (en) 2004-09-15 2005-09-15 Bar-shaped light guide, illumination unit and image-scanning device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004268193A JP2006085975A (en) 2004-09-15 2004-09-15 Bar shape light guide, lighting unit, and image reading device

Publications (1)

Publication Number Publication Date
JP2006085975A true JP2006085975A (en) 2006-03-30

Family

ID=36164292

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004268193A Withdrawn JP2006085975A (en) 2004-09-15 2004-09-15 Bar shape light guide, lighting unit, and image reading device

Country Status (2)

Country Link
JP (1) JP2006085975A (en)
CN (1) CN1750585A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007183470A (en) * 2006-01-10 2007-07-19 Rohm Co Ltd Light guide member
JP2012064369A (en) * 2010-09-15 2012-03-29 Omron Corp Surface light source device and frame used in surface light source device
KR20130069218A (en) * 2011-12-16 2013-06-26 엘지디스플레이 주식회사 Backlight unit and liquid crystal display device having the same
WO2013118414A1 (en) 2012-02-07 2013-08-15 三菱電機株式会社 Light-source device and reflector-support structure
WO2013118388A1 (en) 2012-02-07 2013-08-15 三菱電機株式会社 Light-source device
US9412214B2 (en) 2012-09-07 2016-08-09 Canon Components, Inc. Illumination apparatus, image sensor unit, and paper sheet distinguishing apparatus

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4871765B2 (en) 2007-03-14 2012-02-08 株式会社Ｐｆｕ Scanner, image processing method, and image processing apparatus
JP2011023952A (en) * 2009-07-15 2011-02-03 Fuji Xerox Co Ltd Illuminating device, image reading device, and image forming apparatus
US9266468B2 (en) * 2012-07-27 2016-02-23 Toyoda Gosei Co., Ltd. Linear lighting device
JP6391387B2 (en) * 2014-09-24 2018-09-19 キヤノン株式会社 Light guide unit, illumination device using the same, and image reading device
JP6413852B2 (en) * 2015-03-10 2018-10-31 オムロン株式会社 Push-button switch
JP2020004483A (en) * 2018-06-25 2020-01-09 株式会社小糸製作所 Vehicular lighting fixture

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007183470A (en) * 2006-01-10 2007-07-19 Rohm Co Ltd Light guide member
JP2012064369A (en) * 2010-09-15 2012-03-29 Omron Corp Surface light source device and frame used in surface light source device
US8864358B2 (en) 2010-09-15 2014-10-21 Omron Corporation Surface light source device and frame used therein
KR20130069218A (en) * 2011-12-16 2013-06-26 엘지디스플레이 주식회사 Backlight unit and liquid crystal display device having the same
KR101939079B1 (en) 2011-12-16 2019-01-17 엘지디스플레이 주식회사 Backlight unit and liquid crystal display device having the same
WO2013118414A1 (en) 2012-02-07 2013-08-15 三菱電機株式会社 Light-source device and reflector-support structure
WO2013118388A1 (en) 2012-02-07 2013-08-15 三菱電機株式会社 Light-source device
EP2916064A1 (en) 2012-02-07 2015-09-09 Mitsubishi Electric Corporation Light source device and reflector support structure
US9151465B2 (en) 2012-02-07 2015-10-06 Mitsubishi Electric Corporation Light-source device and reflector-support structure
US9341765B2 (en) 2012-02-07 2016-05-17 Mitsubishi Electric Corporation Light-source device
US9412214B2 (en) 2012-09-07 2016-08-09 Canon Components, Inc. Illumination apparatus, image sensor unit, and paper sheet distinguishing apparatus

Also Published As

Publication number Publication date
CN1750585A (en) 2006-03-22

Similar Documents

Publication Publication Date Title
US7308187B2 (en) Bar-shaped light guide, illumination unit and image-scanning device
JP5499592B2 (en) Light guide, light source device and reading device
JP4093990B2 (en) Light guide, line illumination device, and image reading device
KR101279034B1 (en) Scanner module and image scanning apparatus
US7990584B2 (en) Rod-shaped light guide and image reading device
TWI461636B (en) Light source device
JP2006191521A (en) Illumination device and image reading device
JP5573107B2 (en) Lighting device
JP2011182370A (en) Light source device
JP5755753B2 (en) Illumination unit and image reading apparatus using the same
JP2006085975A (en) Bar shape light guide, lighting unit, and image reading device
JP2009302646A (en) Rod-shaped light guide and image reading device
TWI394920B (en) Light guide and linear light source device
JP4946603B2 (en) Light guide and linear light source device
JP2006148956A (en) Line illuminator and image reader
JP2009225414A (en) Illuminator and image reader
JP6391387B2 (en) Light guide unit, illumination device using the same, and image reading device
US8070340B2 (en) Light guiding member and linear light source apparatus
JP5475237B2 (en) Document illuminator
JP2009037746A (en) Linear light source device and image scanner
JP2012114759A (en) Line light source
WO2016133216A1 (en) Light guide body, light source device and image reading device
JP2006319591A (en) Line lighting system and image scanner
JPH11326769A (en) Image forming element
JP2009075253A (en) Line illuminating unit

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20070704

A761 Written withdrawal of application

Free format text: JAPANESE INTERMEDIATE CODE: A761

Effective date: 20090408

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20090415