JP2809067B2 - Method of arranging light receiving elements of bar code reader - Google Patents
Method of arranging light receiving elements of bar code readerInfo
- Publication number
- JP2809067B2 JP2809067B2 JP5271345A JP27134593A JP2809067B2 JP 2809067 B2 JP2809067 B2 JP 2809067B2 JP 5271345 A JP5271345 A JP 5271345A JP 27134593 A JP27134593 A JP 27134593A JP 2809067 B2 JP2809067 B2 JP 2809067B2
- Authority
- JP
- Japan
- Prior art keywords
- bar code
- light receiving
- code reader
- receiving element
- mirror
- 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
Description
【０００１】[0001]
【産業上の利用分野】この発明は、バ−コ−ドリ−ダに
係り、特にバ−コ−ドシンボルを読取る際の分解能の大
幅な向上を図ることができるバ−コ−ドリ−ダの受光素
子配置方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar code reader, and more particularly, to light reception of a bar code reader capable of greatly improving the resolution when reading a bar code symbol. The present invention relates to an element arrangement method.
【０００２】[0002]
【従来の技術】バ−コ−ドラベルに記載されたバ−コ−
ドシンボルを光学的に読み取ることができるバ−コドリ
−ダが各種開発されているが、このバ−コ−ドリ−ダバ
−コ−ドリ−ダとして、例えば図３に記載のものが知ら
れている。即ち、このバ−コ−ドリ−ダは、光源１００
からの光（散乱光）をバ−コ−ドシンボル１０４にむけ
て出射し、ここで反射した散乱光をミラ−１０１にて反
射させたのち、結像レンズ１０２により受光素子である
ＣＣＤ１０３に入射させるようになっている。2. Description of the Related Art A bar code described on a bar code label is used.
Various bar code readers capable of optically reading a code symbol have been developed. For example, the bar code reader shown in FIG. 3 is known as this bar code reader. . That is, this bar code reader is
(Scattered light) is emitted toward a bar code symbol 104, and the scattered light reflected here is reflected by a mirror 101, and then incident on a CCD 103, which is a light receiving element, by an imaging lens 102. It has become.
【０００３】[0003]
【発明が解決しようとする課題】ところで、このような
バ−コ−ドリ−ダでは、例えば図４に示す様なミラ−を
介在させていない光学系にあっては、光軸１０５に対し
左右同一距離（＋／−Δｒ）だけ離れた位置にあるバ−
コ−ドシンボル上の点が、夫々受光素子上の光軸１０５
に対し左右同一距離（＋／−Δｒ×α）だけ離れた位置
に結像するが、図５に示す光学系では、そうならない。
即ち、これはミラ−１０１のため、受光素子１０３上で
の結像点が左右同一位置ではなく、多少ずれるのであ
る。その結果、直線状に配置されているバ−コ−ドシン
ボルの画像が、図６に示すように、中央を中心にして左
右に僅かずつずれてくるのである。By the way, in such a bar code reader, for example, in an optical system without a mirror as shown in FIG. Bars located at the same distance (+/- Δr)
The points on the code symbol correspond to the optical axes 105 on the light receiving elements, respectively.
However, in the optical system shown in FIG. 5, this does not occur at a position separated by the same left and right distance (+/− Δr × α).
That is, since this is the mirror 101, the image forming point on the light receiving element 103 is not at the same position on the left and right, but is slightly shifted. As a result, the image of the bar code symbol arranged linearly is slightly shifted left and right about the center as shown in FIG.
【０００４】その結果、受光素子１０３を構成する画素
のうち、とくに両端側のずれが大きい部分では、読み取
り誤差も大きくなる。このような事情から、ミラ−を備
えたバ−コ−ドリ−ダにおける分解能の低下が大きな問
題となっている。そこで、この発明は、上記した事情に
鑑み、分解能の高いバ−コ−ドリ−ダの受光素子配置方
法を提供することを目的とするものである。[0004] As a result, reading errors also increase in the pixels constituting the light receiving element 103, particularly in a portion where the displacement at both ends is large. Under such circumstances, a decrease in the resolution of a bar-co-coder equipped with a mirror has become a serious problem. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of arranging a light receiving element of a bar code reader having a high resolution in view of the above circumstances.
【０００５】[0005]
【課題を解決するための手段】即ち、この発明は、発光
部から出射されバ−コ−ドシンボルにて反射される散乱
光が反射するミラ−と、このミラ−で反射した前記散乱
光が入射する受光素子とを備えたバ−コ−ドリ−ダにお
いて、前記散乱光が進行する光路に直交する法線に対し
前記バ−コ−ドシンボルの傾斜角と同一若しくは略等し
い角度だけ傾斜したものである。That is, according to the present invention, there is provided a mirror for reflecting scattered light emitted from a light emitting section and reflected by a bar code symbol, and receiving the scattered light reflected by the mirror. A bar code reader having a light receiving element which is tilted by an angle equal to or substantially equal to the tilt angle of the bar code symbol with respect to a normal perpendicular to the optical path in which the scattered light travels. is there.
【０００６】[0006]
【作用】この発明では、ミラ−を備えた光学系におい
て、斜入射にともない発生するバ−コ−ドシンボルの各
部と受光素子との光学距離の差を考慮して、受光素子を
光軸の法線に対して所定の角度傾斜させ、その光学距離
の差を吸収させているので、受光素子の両端側のずれを
有効に補正することができる。According to the present invention, in the optical system having a mirror, the light receiving element is defined by the optical axis method in consideration of the difference in the optical distance between each part of the bar code symbol generated due to the oblique incidence and the light receiving element. Since the optical line is inclined at a predetermined angle with respect to the line to absorb the difference in the optical distance, it is possible to effectively correct the displacement of the light receiving element at both ends.
【０００７】[0007]
【実施例】以下、この発明の一実施例について添付図面
を参照しながら説明する。図１はこの発明に係る受光素
子配置方法が適用されたバーコードリーダを示すもので
あり、このバーコードリーダは、光軸Ａの法線Ｎ1 と受
光素子であるＣＣＤ（電荷結合素子）１の配設方向との
なす角度θ1 が、バーコードシンボル（図略）が記録さ
れたバーコードラベル１０４の紙面配設方向と光軸Ａの
法線Ｎとのなす角度θ2 と同一若しくは略等しくなるよ
うに構成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a bar code reader to which a method for arranging light receiving elements according to the present invention is applied. This bar code reader includes a normal line N 1 of an optical axis A and a CCD (charge coupled element) 1 as a light receiving element. angle theta 1 is a bar code symbol angle theta 2 of the same or substantially the normal N of the paper laying direction and the optical axis a of the bar code label 104 (not shown) is recorded in the direction of arrangement of the It is configured to be equal.
【０００８】従って、この実施例によれば、バーコード
シンボル１０４上の任意の点で反射した光源１００から
の光が、図２に示すような光路を通って受光素子である
ＣＣＤ（電荷結合素子）１上の各点に入射するが、ＣＣ
Ｄ１を所定の角度傾斜させてあるので、ＣＣＤ１上に結
像される画像には、両端側に歪みを生ずるのを阻止する
ことができる。即ち、図２において、各光路によって形
成される２つの対応する三角形、即ち、ΔＯＡ′Ｂ′と
ΔＯＡ″Ｂ″とは、相似形（対応する各角が等しい）で
あるから、簡単な幾何の公式から次式が得られる。 Ｃ′Ａ′／Ｃ′Ｂ′＝Ｃ″Ａ″／Ｃ″Ｂ″Therefore, according to this embodiment, the light from the light source 100 reflected at an arbitrary point on the bar code symbol 104 passes through the optical path as shown in FIG. ) Incident on each point on 1, but CC
Since D1 is inclined by a predetermined angle, it is possible to prevent the image formed on the CCD 1 from being distorted at both ends. That is, in FIG. 2, two corresponding triangles formed by each optical path, that is, ΔOA′B ′ and ΔOA ″ B ″ are similar shapes (corresponding angles are equal), and therefore have a simple geometric shape. The following equation is obtained from the formula. C'A '/ C'B' = C "A" / C "B"
【０００９】従って、バーコードシンボル１０４上の各
点とこれに対応してＣＣＤ１上に結像される画像との間
には、比例関係が成立しており、その結果読取るべきバ
ーコードシンボル１０４の配置形状と相似形状をなす画
像が、ＣＣＤ１上に形成される。このようにして、ＣＣ
Ｄ１上に結像される画像のうち、両端側であっても歪み
を生ずることがなくなり、正確な画像が得られる。Therefore, a proportional relationship is established between each point on the barcode symbol 104 and the image formed on the CCD 1 corresponding to the point, and as a result, the barcode symbol 104 to be read is obtained. An image having a shape similar to the arrangement shape is formed on the CCD 1. In this way, CC
Distortion does not occur even at both ends of the image formed on D1, and an accurate image can be obtained.
【００１０】[0010]
【発明の効果】以上説明してきたようにこの発明によれ
ば、ミラーを備えた光学系において、斜入射にともない
発生するバーコードシンボルの各部と受光素子との間の
光学距離の差を考慮して、受光素子を光軸の法線に対し
て所定の角度傾斜させ、その光学距離の差を吸収させて
いるので、受光素子の両端側のずれを有効に補正するこ
とができ、延いてはバーコードシンボルに対し高分解能
を発揮することができる高性能のバーコードリーダが提
供できる。As described above, according to the present invention, in an optical system having a mirror, a difference in optical distance between each part of a bar code symbol and a light receiving element, which is caused by oblique incidence, is considered. Therefore, the light receiving element is tilted at a predetermined angle with respect to the normal of the optical axis to absorb the difference in the optical distance, so that the displacement of both ends of the light receiving element can be effectively corrected. A high-performance barcode reader capable of exhibiting high resolution for barcode symbols can be provided.
【図１】この発明に係る受光素子配置方法が適用された
バーコードリーダを示す概略構成図。FIG. 1 is a schematic configuration diagram showing a bar code reader to which a light receiving element arrangement method according to the present invention is applied.
【図２】図１に示すバーコードリーダの光学系における
光路図。FIG. 2 is an optical path diagram in the optical system of the bar code reader shown in FIG.
【図３】従来のバーコードリーダにおける概略構成図。FIG. 3 is a schematic configuration diagram of a conventional bar code reader.
【図４】従来のバーコードリーダにおけるミラーを備え
ていないタイプの光学系の光路を示す説明図。FIG. 4 is an explanatory diagram showing an optical path of a type of optical system without a mirror in a conventional bar code reader.
【図５】従来のバーコードリーダにおけるミラーを備え
たタイプの光学系の光路を示す説明図。FIG. 5 is an explanatory view showing an optical path of a conventional optical system having a mirror in a bar code reader.
【図６】従来タイプのバーコードリーダにおける欠点を
示す説明図。FIG. 6 is an explanatory view showing a defect in a conventional bar code reader.
１ ＣＣＤ（受光素子） １００ 発光部 １０１ ミラー １０４ バーコードシンボル Ａ 光路 Ｎ1 ，Ｎ2 法線1 CCD (light receiving element) 100 emitting unit 101 mirror 104 bar code symbol A light path N 1, N 2 normal
Claims (1)
にて反射される散乱光が反射するミラ−と、このミラ−
で反射した前記散乱光が入射する受光素子とを備えたバ
−コ−ドリ−ダにおいて、 前記散乱光が進行する光路に直交する法線に対し前記バ
−コ−ドシンボルが記載されたラベル紙面の傾斜する角
度と同一若しくは略等しい角度だけ、前記受光素子を前
記法線に対して傾斜させたことを特徴としたバ−コ−ド
リ−ダの受光素子配置方法。1. A mirror for reflecting scattered light emitted from a light emitting unit and reflected by a bar code symbol, and a mirror for reflecting the scattered light.
A light receiving element on which the scattered light reflected by the illuminating light enters, a label paper surface on which the bar code symbol is written with respect to a normal line orthogonal to an optical path in which the scattered light travels. Wherein the light receiving element is inclined with respect to the normal line by an angle equal to or substantially equal to the angle of inclination of the bar code reader.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5271345A JP2809067B2 (en) | 1993-10-04 | 1993-10-04 | Method of arranging light receiving elements of bar code reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5271345A JP2809067B2 (en) | 1993-10-04 | 1993-10-04 | Method of arranging light receiving elements of bar code reader |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07105302A JPH07105302A (en) | 1995-04-21 |
| JP2809067B2 true JP2809067B2 (en) | 1998-10-08 |
Family
ID=17498772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5271345A Expired - Lifetime JP2809067B2 (en) | 1993-10-04 | 1993-10-04 | Method of arranging light receiving elements of bar code reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2809067B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020086745A (en) | 2018-11-21 | 2020-06-04 | 株式会社キーエンス | Optical code reading device |
-
1993
- 1993-10-04 JP JP5271345A patent/JP2809067B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07105302A (en) | 1995-04-21 |
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