JPH01198710A - Optical projecting system - Google Patents

Optical projecting system

Info

Publication number
JPH01198710A
JPH01198710A JP2203188A JP2203188A JPH01198710A JP H01198710 A JPH01198710 A JP H01198710A JP 2203188 A JP2203188 A JP 2203188A JP 2203188 A JP2203188 A JP 2203188A JP H01198710 A JPH01198710 A JP H01198710A
Authority
JP
Japan
Prior art keywords
light
light guide
halogen lamp
hot
light beam
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
JP2203188A
Other languages
Japanese (ja)
Inventor
Akira Okumoto
奥本 亮
Masaaki Terada
寺田 正明
Takahiro Sakamoto
孝宏 坂本
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.)
Azbil Corp
Original Assignee
Azbil Corp
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 Azbil Corp filed Critical Azbil Corp
Priority to JP2203188A priority Critical patent/JPH01198710A/en
Publication of JPH01198710A publication Critical patent/JPH01198710A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24Coupling light guides
    • G02B6/42Coupling light guides with opto-electronic elements
    • G02B6/4298Coupling light guides with opto-electronic elements coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

PURPOSE:To obtain a uniform light projecting spot in response to a light guide without using optical parts such as a lens by forming a ground glass rugged on either or both surfaces of a hot-wire attenuating filter provided proximately on the light guide between a halogen lamp and the light guide. CONSTITUTION:The edge of the light guide 3 is disposed near the focus of a luminous flux from the halogen lamp 1, and the ground glass rugged face 5 is formed onto the hot-wire attenuating filter 4 provided between the halogen lamp 1 and the light guide 3. Accordingly, a light beam from the halogen lamp 1 is diffused in immediately front of the light guide 3 due to the rugged face 5 of the hot-wire attenuating filter 4, and the hot-line of the light beam is attenuated when the light beam transmits the filter 4, and the light is incident on the light guide 3. Then, the light beam which is incident on the light guide is converted into an irregular diffusing light. Thus, the uniform light projecting spot obtained from the other edge of the light guide 3 is obtained.

Description

【発明の詳細な説明】 この発明はハロゲンランプの投光光束を光フアイバー束
により構成されるライトガイドへ導くための投光光学系
に関するもので、色検出装置等への応用が可能であろう 〔従来技術〕 ハロゲンランプはその性質上白色光にきわめて近い光を
発するため、より正確な色を認識するのに好んで用いら
れるが、第2図に示すようにランプ2のガラス封止部1
aがその光軸上にあるため通常反射鏡3を有し、この反
射鏡によってその光を効率よ(その前方に反射するよう
にしている。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light projection optical system for guiding the light beam emitted from a halogen lamp to a light guide constituted by a bundle of optical fibers, and may be applied to color detection devices, etc. [Prior Art] Halogen lamps emit light that is very similar to white light due to their nature, and are therefore preferably used for more accurate color recognition.
Since point a is on its optical axis, it usually has a reflecting mirror 3, which reflects the light efficiently (in front of it).

この図においてランプ2に近接する光軸付近では光量の
ひじように少ない光束しか存在しないため、光量分布は
第3図Aのようになる。一方同図Bで示すように焦点付
近では光量の多い光点が得られるが、各光線の元軸とな
す角度は他の部分と変わらないため、その点に光フアイ
バー束からなるライトガイドの端部を置いたばあい、こ
のライトガイドの他端からの投光スポットも環状となる
なおランプ2の光軸上において焦点bかも遠去かるにし
たがってその光束分布は同図C,Dのように変化する。
In this figure, since there is only an elbow-like amount of light flux near the optical axis near the lamp 2, the light amount distribution becomes as shown in FIG. 3A. On the other hand, as shown in Figure B, a light spot with a large amount of light is obtained near the focal point, but since the angle between the original axis of each light ray and the other parts is the same, the end of the light guide consisting of an optical fiber bundle is placed at that point. If the light guide is placed at the same position, the light spot emitted from the other end of the light guide will also be annular.As the focal point b moves further away on the optical axis of the lamp 2, its luminous flux distribution will become as shown in C and D in the same figure. Change.

そこで投光スポットの形状が環状になる現象を回避する
ために第4図に示すようにランプ2の光軸上において、
その焦点から遠去かる位置に凸し/ズ11を配設し、こ
の凸レンズを通ることによってほぼ平行光に補正した光
束をライトガイド1に入光させる方法、あるいは同じ目
的をもつ1第5図に示すようにその焦点以前の位置に凹
レンズ12を配設する方法がある。
Therefore, in order to avoid the phenomenon that the shape of the projected light spot becomes annular, on the optical axis of the lamp 2, as shown in FIG.
A method of arranging a convex lens 11 at a position far from the focal point and passing through this convex lens to make the light beam corrected to almost parallel light enter the light guide 1, or a method having the same purpose as shown in Fig. 5. There is a method of arranging a concave lens 12 at a position before the focal point, as shown in FIG.

〔この発明が解決しようとする問題点〕第4図あるいは
第5図に示すものにあってはレンズ11.12を保持す
る必要があり、しかもその構造が複雑となり、いきおい
部品点数の増加とともにそれを装置として組立てたばあ
いにその構造も全体的に大きくなる欠点がある。
[Problems to be Solved by the Invention] In the lens shown in FIG. 4 or 5, it is necessary to hold the lenses 11 and 12, and the structure thereof becomes complicated. When assembled as a device, the structure has the disadvantage of becoming larger as a whole.

〔発明の目的〕[Purpose of the invention]

この発明はこのような従来の欠点にかんがみ、とくにレ
ンズ等の光学部品を用いることな(ライトガイドに対し
て均一な投光スポットを得ることを目的とする。
In view of these conventional drawbacks, the present invention aims to obtain a uniform light projection spot onto a light guide without using optical components such as lenses.

〔発明の構成〕[Structure of the invention]

この発明はその目的を達成するためにライトガイドの一
端かノ・ロゲンランプからの光束の焦点付近に配設され
る。
In order to achieve this object, the present invention is arranged at one end of the light guide near the focal point of the light beam from the logen lamp.

またハロゲンランプとライトガイド間においてこのライ
トガイドに近接して熱稼減衰フィルターが設けられ、か
つこの減衰フィルターの一方の面fたは両方の面にはス
リガラス状の凹凸面が形成される。
Further, a thermal attenuation filter is provided between the halogen lamp and the light guide in close proximity to the light guide, and a ground glass-like uneven surface is formed on one or both surfaces of the attenuation filter.

〔発明の作用〕[Action of the invention]

ハロゲンランプで発生した光線は熱IvI!減衰フィル
ターを透過する際、その凹凸面によって拡散された状態
でライトガイドに入射する。このためライトガイドの他
端から得られる投光スポットは均一となる。
The light rays generated by a halogen lamp are heat IvI! When the light passes through the attenuation filter, it enters the light guide in a diffused state due to its uneven surface. Therefore, the projected light spot obtained from the other end of the light guide becomes uniform.

〔実施例〕〔Example〕

以下図によってこの発明の一実施例について説明する。 An embodiment of the present invention will be described below with reference to the drawings.

すなわち第1図においてハロゲンランプ1は反射鏡2を
有している。またライトカイト3は複数の光ファイバー
すなわち光ファイバー束により構成される。そしてこの
ライトカイト昏エノ・ロゲンランプ1の光軸上におい又
その一端がハロゲンランプ1かもの光束の焦点付近に位
置するように配設される。
That is, in FIG. 1, a halogen lamp 1 has a reflecting mirror 2. In FIG. Furthermore, the light kite 3 is constituted by a plurality of optical fibers, that is, an optical fiber bundle. The light kite lamp 1 is arranged on the optical axis so that one end thereof is located near the focal point of the luminous flux of the halogen lamp 1.

ハロゲンランフ1とライトガイド3間にはハロゲンラン
プ1によって発生する熱線を減衰させるための熱線波長
フィルター4が設けられる。そしてこのフィルターの一
方の面すなわちハロゲンランプ1側にはスリガラス状の
凹凸面5が形成される。
A heat ray wavelength filter 4 for attenuating heat rays generated by the halogen lamp 1 is provided between the halogen lamp 1 and the light guide 3. A ground glass-like uneven surface 5 is formed on one surface of this filter, that is, on the halogen lamp 1 side.

したがってハロゲンランプlかもの光線はライトガイド
3の直前で熱線減衰フィルター4の凹凸面5によって散
乱され、さらにそのフィルターを通過する際にその光軸
のもつ熱縁が減衰された後にライトガイド3に入射する
。このとぎライトガイドに入射する光線は規則性のない
拡散光線となるためライトカイト3の他端からの投光ス
ポットは均一度の高いものとなる。
Therefore, the light beam from the halogen lamp is scattered by the uneven surface 5 of the heat ray attenuation filter 4 just before the light guide 3, and after passing through the filter, the thermal edge of the optical axis is attenuated, and then the light beam is directed to the light guide 3. incident. Since the light rays incident on this sharp light guide become irregularly diffused rays, the light spot projected from the other end of the light kite 3 has a high degree of uniformity.

なお凹凸面5は熱線減衰フィルター4の一方の面に限定
されるものではなく、その両面に形成することも可能で
、このばあいにはライトガイド3に達するスポットは多
少その光量が減少するものの一層均一度の高いものとな
る。したがってその選択は使用目的によって適宜なされ
る。
Note that the uneven surface 5 is not limited to one side of the heat ray attenuation filter 4, but can also be formed on both sides. This results in even higher uniformity. Therefore, the selection is made appropriately depending on the purpose of use.

〔発明の効果〕〔Effect of the invention〕

この発明は上述のようにライトガイドの一端をハロゲン
ランプからの光束の焦点付近に配設するとともに、ハロ
ゲンランプとライトガイド間に設けた熱線減衰フィルタ
ーにスリガラス状の凹凸面を形成しているので、ハロゲ
ンランプからの光は拡散された状態でライトガイドに入
射し、したがってこのライトガイドの他端から得られる
投光スポットはひじように均一なものが得られる利点が
ある。
In this invention, as described above, one end of the light guide is arranged near the focal point of the light beam from the halogen lamp, and a ground glass-like uneven surface is formed on the heat ray attenuation filter provided between the halogen lamp and the light guide. The light from the halogen lamp enters the light guide in a diffused state, and therefore the light spot obtained from the other end of the light guide has the advantage of being elbow-like uniform.

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

第1図はこの発明における投光光学系の一実施例な示す
側面図、第2図はハロゲンランプの投光曲線を示す側面
図、第3図は第2図の各点における特性曲線図、第4図
および第5図は従来の投光光学系を示す側面図である。 l・・・ハロゲンランプ、2・・・反射鏡、3・・・ラ
イトガイド、4・・・熱線減衰フィルター、5・・・凹
凸部。
FIG. 1 is a side view showing an embodiment of the light projection optical system according to the present invention, FIG. 2 is a side view showing the light projection curve of a halogen lamp, and FIG. 3 is a characteristic curve diagram at each point in FIG. 4 and 5 are side views showing a conventional light projection optical system. l...Halogen lamp, 2...Reflector, 3...Light guide, 4...Heat ray attenuation filter, 5...Irregular portion.

Claims (1)

【特許請求の範囲】[Claims] 反射鏡を有するハロゲンランプと、光ファイバー束によ
り構成されるライトガイドおよびこのライトガイドと上
記ハロゲンランプとの間に設けられ、上記ライトガイド
への熱線を減少させる熱線減衰フィルターとを備えたも
のにおいて、上記ライトガイドの一端を上記ハロゲンラ
ンプからの光束の焦点付近に配設するとともに、上記熱
線減衰フィルターの一方の面または両面にスリガラス状
の凹凸面を形成したことを特徴とする投光光学系。
A halogen lamp having a reflecting mirror, a light guide constituted by an optical fiber bundle, and a heat ray attenuation filter provided between the light guide and the halogen lamp to reduce heat rays to the light guide, A projection optical system characterized in that one end of the light guide is disposed near the focal point of the light beam from the halogen lamp, and a ground glass-like uneven surface is formed on one or both surfaces of the heat ray attenuation filter.
JP2203188A 1988-02-03 1988-02-03 Optical projecting system Pending JPH01198710A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2203188A JPH01198710A (en) 1988-02-03 1988-02-03 Optical projecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2203188A JPH01198710A (en) 1988-02-03 1988-02-03 Optical projecting system

Publications (1)

Publication Number Publication Date
JPH01198710A true JPH01198710A (en) 1989-08-10

Family

ID=12071607

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2203188A Pending JPH01198710A (en) 1988-02-03 1988-02-03 Optical projecting system

Country Status (1)

Country Link
JP (1) JPH01198710A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11396225B2 (en) 2015-11-16 2022-07-26 Kubota Corporation Electric work vehicle, battery pack for electric work vehicle and contactless charging system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60242408A (en) * 1984-05-17 1985-12-02 Seiko Epson Corp Optical system of light source for light guide

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60242408A (en) * 1984-05-17 1985-12-02 Seiko Epson Corp Optical system of light source for light guide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11396225B2 (en) 2015-11-16 2022-07-26 Kubota Corporation Electric work vehicle, battery pack for electric work vehicle and contactless charging system

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