JPH01253604A - Lens system - Google Patents
Lens systemInfo
- Publication number
- JPH01253604A JPH01253604A JP63081043A JP8104388A JPH01253604A JP H01253604 A JPH01253604 A JP H01253604A JP 63081043 A JP63081043 A JP 63081043A JP 8104388 A JP8104388 A JP 8104388A JP H01253604 A JPH01253604 A JP H01253604A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- light
- light receiving
- optical axis
- receiving 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 41
- 239000011521 glass Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Image Input (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Measurement Of Optical Distance (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、光距離センサー、バーコードリーダー、その
他の光学的機器に使用されるレンズ系に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a lens system used in optical distance sensors, barcode readers, and other optical equipment.
「従来の技術」
従来、第７図に示すように、半導体レーザーダイオード
ＬＤ（以下、単にＬＤと称す）と投光レンズ（いずれも
図示せず）とで構成された投光モジュール１０１のＩ、
Ｄより特定周波数数で光強度変調された赤外線を躬出し
、それを投光レンズで測定対象物１０２上に集光し、そ
の反射光を受光レンンズ１．０３で集光し、受光レンズ
１０３で集光した光信号をフォトダイオードＰＤ（以下
、単にＰＤと称す）で電気信号に変換信号処理部１０４
で測定対象物１０２から反射光の電気信号とＬＤ駆動信
号とを比較し、その位相差を距離信号としてデジタル出
力する光距離センサーのレンズ系があった。"Prior Art" Conventionally, as shown in FIG. 7, a light emitting module 101 including a semiconductor laser diode LD (hereinafter simply referred to as LD) and a light emitting lens (none of which are shown),
Infrared light whose light intensity is modulated at a specific frequency is extracted from D, and the light is focused on the measurement target 102 by the light projecting lens.The reflected light is focused by the light receiving lens 1.03, and the light is focused by the light receiving lens 103. A signal processing unit 104 converts the focused optical signal into an electrical signal using a photodiode PD (hereinafter simply referred to as PD).
There was a lens system of an optical distance sensor that compares an electric signal of reflected light from the measurement object 102 with an LD drive signal and digitally outputs the phase difference as a distance signal.
「発明が解決しようとする課題」
上記従来のレンズ系においては、投光レンズと受光レン
ズとが分離して設置されているため、投光レンズと受光
レンス１０３およびＰＤのそれぞれを保持する別個の部
利が必要であるばかりでなく、最終組立工程でそれぞれ
の光軸を合わせる調整が非常に困難であった。“Problems to be Solved by the Invention” In the above-mentioned conventional lens system, the light emitting lens and the light receiving lens are installed separately. Not only did this require a large amount of space, but it was also extremely difficult to adjust the optical axes of each in the final assembly process.
「課題を解決するだめの手段」
そこで、本発明は、上記の事情に鑑み、投光レンズと受
光レンスとのそれぞれを保持する別個の部材を用いるこ
となく、光軸を合わせる調整を簡単ニずべく、受光レン
ズの光軸中心に光軸を合わせて投光レンズを配置し一体
化したものである。"Means for Solving the Problem" In view of the above circumstances, the present invention provides a method for easily adjusting the optical axis without using separate members for holding each of the light emitting lens and the light receiving lens. In order to achieve this, the light emitting lens is arranged and integrated with its optical axis aligned with the center of the optical axis of the light receiving lens.
「作 用」
予め投光レンズと受光レンズを光軸を合わせて一体化し
であるので、最終組立工程で投光レンズと受光レンズの
光軸を合わせる調整は不要である。``Function'' Since the light emitting lens and the light receiving lens are integrated in advance with their optical axes aligned, there is no need to adjust the optical axes of the light emitting lens and the light receiving lens in the final assembly process.
「実施例」
第１図に示す光距離センサーにおいて、Ｌ Ｄより特定
周波数で光強度変調された赤外線を射出し、それを投光
レンズ１で測定対象物２」二に集光し、その反射光を受
光レンズ３で集光し、受光レンズ３で集光した光信号を
ＰＤで電気信号に変換し、信号処理部４で測定対象物２
からの反射光の電気信号とＬ Ｄ駆動信号とを比較し、
その位相差を距離信号としてデジタル出力する。ここで
、投光レンズ１ば受光レンズ３の光軸中心に位置し投光
レンズ１と受光レンズ３とは光軸を合わせて一体化され
ている。``Example'' In the optical distance sensor shown in Fig. 1, infrared light whose light intensity is modulated at a specific frequency is emitted from the LD, which is focused on the object to be measured 2 by the projecting lens 1, and then reflected. The light is collected by the light receiving lens 3, the optical signal collected by the light receiving lens 3 is converted into an electrical signal by the PD, and the signal processing unit 4 converts the light to the measurement target 2.
Compare the electric signal of the reflected light from the LD drive signal with the LD drive signal,
The phase difference is digitally output as a distance signal. Here, the light projecting lens 1 is located at the center of the optical axis of the light receiving lens 3, and the light projecting lens 1 and the light receiving lens 3 are integrated with their optical axes aligned.
また、第２図に示すバーコードリーダーにおいてＬＤよ
りレーザー光を射出し、それを投光レンズ１１で回転す
るスキャニングミラー１２上に集光し、スキャニングミ
ラー１２で反射されたレーザー光はバーコードシンボル
１３上を走査してバーコードシンボル１３からの反射光
はスキャニングミラー１２を経て受光レンズ１４で集光
し、受光レンズ１４て集光した光信号をＰＤで電気信号
に変換し、この電気信号を増幅、Ａ／Ｄ変換し、出力す
る。ここで、投光レンズ］１は受光レンズ１４の光軸中
心に位置し投光レンズ１１と受光レンズ１４とは光軸を
合わせて一体化されている。In addition, in the barcode reader shown in FIG. 2, a laser beam is emitted from an LD, and a projection lens 11 focuses the laser beam onto a rotating scanning mirror 12, and the laser beam reflected by the scanning mirror 12 emits a barcode symbol. The reflected light from the barcode symbol 13 passes through the scanning mirror 12 and is focused by the light receiving lens 14.The light signal focused by the light receiving lens 14 is converted into an electrical signal by the PD, and this electrical signal is Amplify, A/D convert, and output. Here, the light projecting lens 1 is located at the center of the optical axis of the light receiving lens 14, and the light projecting lens 11 and the light receiving lens 14 are integrated with their optical axes aligned.
本発明の投光レンズは受光レンズの光軸中心に位置し投
光レンズと受光レンズを光軸を合わせて一体化した具体
例として次のものがある。The light projecting lens of the present invention is located at the center of the optical axis of the light receiving lens, and the following is a specific example in which the light projecting lens and the light receiving lens are integrated with their optical axes aligned.
第３図ではガラス製受光レンズ２１にその光軸上で一面
側にハンジング２２内に収容された３枚のレンズで構成
された投光レンズ２３を光軸を合わせて固着し、他面側
にはＬＤを光軸を合わせて固着する。符号２５はホルダ
ーである。開口数（ＮＡ）が大きいときはこのように多
数のレンズを用いたものを使用する。In FIG. 3, a light emitting lens 23 consisting of three lenses housed in a hanging 22 is fixed to one side of the glass light receiving lens 21 with the optical axis aligned, and the other side is fixed to the glass light receiving lens 21. Align the optical axis and fix the LD. Reference numeral 25 is a holder. When the numerical aperture (NA) is large, a lens using a large number of lenses like this is used.
第４図ではガラス製受光レンズ３１にその光軸上で一面
側にハウジングを用いることなく２枚のガラス製のレン
ズで構成された投光レンズ３２を光軸を合わせて直接固
着し、他面側にはＬＤを光軸を合わせて固着する。開口
数が小さいときはこのように少数のレンズを用いたもの
を使用する。In FIG. 4, a light emitting lens 32 composed of two glass lenses is fixed directly on one side of the glass light receiving lens 31 on its optical axis, without using a housing, with the optical axes aligned, and on the other side. An LD is fixed to the side with its optical axis aligned. When the numerical aperture is small, a lens using a small number of lenses like this is used.
第５図では例えばＰＭＭＡなどのプラスチック製の受光
レンズ４１にその光軸上で一面側にガラス製の投光レン
ズ４２を光軸を合わせて固着し、他面側にＬＤを光軸を
合わせて固着する。ここで投光レンズ４２をプラスチッ
ク製とすることもできる。In FIG. 5, a glass light emitting lens 42 is fixed to one side of the light receiving lens 41 made of plastic such as PMMA with its optical axis aligned, and an LD is fixed on the other side with its optical axis aligned. stick. Here, the light projecting lens 42 can also be made of plastic.
第６図ではＰＭＭＡなどのプラスチックあるいはガラス
で受光レンズ部５１と投光レンズ部５２とをそれぞれの
光軸を合わせて一体にモールドしたものである。多数枚
のレンズを用いることなく一体にモールドしたので、投
光レンズ部５２の内外面は非球面に形成して収差を小さ
くするようにしている。In FIG. 6, a light-receiving lens section 51 and a light-emitting lens section 52 are integrally molded from plastic such as PMMA or glass, with their respective optical axes aligned. Since it is integrally molded without using a large number of lenses, the inner and outer surfaces of the light projecting lens section 52 are formed into aspherical surfaces to reduce aberrations.
受光レンズ部５１の光軸上で外面側にはＬＤを光軸を合
わせて固着する。An LD is fixed on the outer surface of the light-receiving lens portion 51 on the optical axis with its optical axis aligned.
「発明の効果」
本発明は、レンズ系において受光レンズの光軸中心に投
光レンズを光軸を合わせて配置し一体化したものである
ので、投光レンズと受光レンズのそれぞれを保持する別
個の部材を要することなく一部材で投光レンズと受光レ
ンズとを保持でき、光軸を合わせる調整が非常に簡単に
なる。また、本発明によるとレンズ系の装置のコンパク
ト化が可能となる。"Effects of the Invention" The present invention is a lens system in which the light emitting lens is arranged and integrated with its optical axis aligned with the center of the optical axis of the light receiving lens. The light emitting lens and the light receiving lens can be held with a single member without the need for other members, and adjustment to align the optical axes becomes very simple. Further, according to the present invention, it is possible to make the lens system device more compact.
第１図は本発明のレンズ系を光距離センサーに用いた場
合の概念図、第２図は本発明のレンズ系をバーコードリ
ーダーに用いた場合の概念図、第３〜６図は受光レンズ
の光軸中心に投光レンズを光軸を合わせて配置し一体化
したレンズ系の縦断面図、第７図は従来のレンズ系の概
念図である。
ＬＤ・・・レーザーダイオード
（半導体レーザー）
２・・・対 象 物
１３・・・バーコードシンボル
（対象物の例）
３・１４・２１・３１・４１・５１・・・受 光 し
ン ズ＝６＝
Ｐ ｌ）・・・フォトダイオード
（光電変換素子）Figure 1 is a conceptual diagram when the lens system of the present invention is used in an optical distance sensor, Figure 2 is a conceptual diagram when the lens system of the present invention is used in a barcode reader, and Figures 3 to 6 are light receiving lenses. FIG. 7 is a conceptual diagram of a conventional lens system. LD... Laser diode (semiconductor laser) 2... Target object 13... Barcode symbol (example of target object) 3, 14, 21, 31, 41, 51... Light reception
= 6 = Pl)...Photodiode (photoelectric conversion element)
Claims (1)
象物上からの反射光を集光する受光レンズと、集光した
光信号を電気信号に変換するフォトダイオードとよりな
り、上記受光レンズの光軸中心に投光レンズを光軸を合
わせて配置したことを特徴とするレンズ系(1) Consists of a laser diode that emits laser light, a light receiving lens that collects reflected light from an object, and a photodiode that converts the focused optical signal into an electrical signal, and the optical axis of the light receiving lens A lens system characterized by a projection lens placed in the center with the optical axis aligned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63081043A JP2604792B2 (en) | 1988-03-31 | 1988-03-31 | Optical measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63081043A JP2604792B2 (en) | 1988-03-31 | 1988-03-31 | Optical measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01253604A true JPH01253604A (en) | 1989-10-09 |
| JP2604792B2 JP2604792B2 (en) | 1997-04-30 |
Family
ID=13735410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63081043A Expired - Fee Related JP2604792B2 (en) | 1988-03-31 | 1988-03-31 | Optical measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2604792B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6025471A (en) * | 1983-07-22 | 1985-02-08 | Hidehiko Yamada | Optical displacement measuring method |
| JPS6130707A (en) * | 1984-07-20 | 1986-02-13 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Photosensor for position servo |
-
1988
- 1988-03-31 JP JP63081043A patent/JP2604792B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6025471A (en) * | 1983-07-22 | 1985-02-08 | Hidehiko Yamada | Optical displacement measuring method |
| JPS6130707A (en) * | 1984-07-20 | 1986-02-13 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Photosensor for position servo |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2604792B2 (en) | 1997-04-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |