JPS6234360Y2 - - Google Patents
Info
- Publication number
- JPS6234360Y2 JPS6234360Y2 JP1982045053U JP4505382U JPS6234360Y2 JP S6234360 Y2 JPS6234360 Y2 JP S6234360Y2 JP 1982045053 U JP1982045053 U JP 1982045053U JP 4505382 U JP4505382 U JP 4505382U JP S6234360 Y2 JPS6234360 Y2 JP S6234360Y2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- scanning device
- output
- comparison circuit
- failure
- 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
Links
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Description
【考案の詳細な説明】
本考案は、バーコード読取装置における故障検
知方式に関する。[Detailed Description of the Invention] The present invention relates to a failure detection method in a barcode reading device.
一般的なバーコード読取装置においては、第１
図にブロツク図で示すように、バーコードラベル
１は、光ビームを光学的に走査する光学的走査装
置（撮像管、または半導体アレイからなる走査装
置）２により走査され、バーコードの濃淡は、走
査装置内の光検知器によりビデオ信号３に変換さ
れ、信号比較回路４によりバーコードに対応した
パルス列５となる。論理回路からなる信号処理回
路６は、このパルス列５を解読し、読取結果を出
力する。 In general barcode reading devices, the first
As shown in the block diagram in the figure, a barcode label 1 is scanned by an optical scanning device (a scanning device consisting of an image pickup tube or a semiconductor array) 2 that optically scans a light beam, and the shading of the barcode is It is converted into a video signal 3 by a photodetector in the scanning device, and converted into a pulse train 5 corresponding to a barcode by a signal comparison circuit 4. A signal processing circuit 6 consisting of a logic circuit decodes this pulse train 5 and outputs a read result.
この様にしてバーコード読取装置は読取り動作
を行なうが、このバーコード読取装置を組み込む
一般的なシステムにおいては、バーコード読取装
置が正常に動作しているかどうかを知る故障信号
を必要とし、システムの正常動作の管理を行な
う。 A barcode reader performs a reading operation in this way, but in a general system incorporating this barcode reader, a failure signal is required to know whether the barcode reader is operating normally, and the system manage the normal operation of the
そこで従来第１図に示すように走査装置２と、
信号処理装置４とにそれぞれ故障検知回路７，８
を追加し、その故障信号の論理和を出力するよう
にしていた。この場合、走査装置２、信号比較回
路４は、多種多様な部品から構成されており、そ
の全ての動作の故障を検知するには、検知回路が
複雑になり、また高価になるため困難であつた。
このため、特に主要な部品のみの故障検知を行な
うようにしたため、故障が発生しても故障信号が
出力されない不具合が生じる場合があつた。 Therefore, conventionally, as shown in FIG. 1, a scanning device 2,
Failure detection circuits 7 and 8 are provided for the signal processing device 4 and the signal processing device 4, respectively.
was added, and the logical sum of the fault signals was output. In this case, the scanning device 2 and the signal comparison circuit 4 are composed of a wide variety of components, and it is difficult to detect malfunctions in all of their operations because the detection circuit becomes complicated and expensive. Ta.
For this reason, in particular, since failures were detected only in major components, there were cases in which a failure signal was not output even if a failure occurred.
本考案は、信号処理回路４からのパルス列信号
５に故障検知回路１０を設けることにより走査装
置２、信号比較回路４の全ての部品の動作の故障
を検知できるようにしたものである。 In the present invention, a failure detection circuit 10 is provided for the pulse train signal 5 from the signal processing circuit 4, so that failures in the operation of all parts of the scanning device 2 and the signal comparison circuit 4 can be detected.
第２図の構成ブロツク図に基ずき、本考案を詳
細に説明する。走査装置２は、ある規定の毎秒の
走査回数で動作しており、その１回の走査の開始
または、終りに必ず走査するよう走査装置内の走
査線上にタイミングマーク９を設ける。すると、
信号比較回路４からのパルス列５は、第３図に示
すように、毎秒の走査回数に同期する周期T1の
信号がバーコード信号１２の有無にかかわらず得
られるタイミング信号１１となる。 The present invention will be explained in detail based on the configuration block diagram of FIG. The scanning device 2 operates at a predetermined number of scans per second, and a timing mark 9 is provided on the scanning line within the scanning device so that scanning is always performed at the beginning or end of one scan. Then,
As shown in FIG. 3, the pulse train 5 from the signal comparator circuit 4 becomes a timing signal 11 in which a signal with a period T 1 synchronized with the number of scans per second is obtained regardless of the presence or absence of the barcode signal 12.
この周期T1の変動を常に監視し、T1が
Ｔ＝１／Ｎ …(1)
Ｎ；走査装置の毎秒の走査回数
上記(1)式の走査回数の周期Ｔより大きい値とな
つた場合、走査装置の走査回数が減少したこと、
または、信号比較回路が正確なパルス列を出力し
ていないことを示し、バーコード読取装置に故障
が発生していることを示している。 Constantly monitor the fluctuation of this period T 1 , and if T 1 becomes a value larger than the period T of the number of scans in equation (1) above, , the number of scans of the scanning device is reduced;
Alternatively, it indicates that the signal comparison circuit is not outputting an accurate pulse train, indicating that a failure has occurred in the barcode reading device.
また、走査装置２，信号比較回路４の電源系の
故障が発生した場合、第３図のパルス１１，１２
は、出力されない状態になり、故障が発生してい
ることを示している。 In addition, if a failure occurs in the power supply system of the scanning device 2 and signal comparison circuit 4, the pulses 11 and 12 in FIG.
is in a state where there is no output, indicating that a failure has occurred.
この周期T1を監視する回路を第４図に示す。
再トリガ型モノステーブルマルチバイブレータ１
３（以後モノマルチと略す。）とプリツププロツ
プ１５（以後Ｆ，Ｆと略す。）で構成されてい
る。モノマルチ１３の出力保守時間T2は、
2T＞T2＞Ｔ …(2)
を満足する値とする。すると、T2＞T1の正常動
作の場合、モノマルチ１３は出力保持時間内に再
トリガされるため出力１４は、常にＨレベルに保
持され、FF１５はセツトされず故障信号は出さ
れない。もし一瞬でもT2＜T1になつた場合、モ
ノマルチ１３は再トリガされないためFF１５を
セツトし、故障信号が出力される。 A circuit for monitoring this period T1 is shown in FIG.
Retrigger type monostable multivibrator 1
3 (hereinafter abbreviated as mono-multi) and prepprop 15 (hereinafter abbreviated as F, F). The output maintenance time T 2 of the monomulti 13 is a value that satisfies 2T>T2>T (2). Then, in the case of normal operation where T 2 >T 1 , the monomulti 13 is retriggered within the output holding time, so the output 14 is always held at H level, the FF 15 is not set, and no failure signal is issued. If T 2 <T 1 even momentarily, the monomulti 13 will not be retriggered, so the FF 15 is set and a failure signal is output.
以上のように本考案は、走査装置内の走査線上
にタイミングマーグを配置し、また、信号比較回
路から出力されるパルス列を入力とする故障検知
回路を配置したことにより、走査装置の電源系か
ら走査系，受光系，または、信号比較回路の電源
系から回路系の全ての故障検知を安価な回路で簡
単に実現できることを示している。 As described above, the present invention has a timing mark placed on the scanning line in the scanning device, and a failure detection circuit that receives the pulse train output from the signal comparison circuit as input, thereby making it possible to remove the power from the power supply system of the scanning device. This shows that failure detection in all circuit systems, from the scanning system, the light receiving system, or the power supply system of the signal comparison circuit, can be easily realized using inexpensive circuits.
第１図は、従来のバーコード読取装置を示し、
第２図は、本考案を実施したバーコード読取装置
を示し、第３図は、パルス列を示し、第４図は、
故障検知回路の１例を示す。
FIG. 1 shows a conventional barcode reading device,
FIG. 2 shows a barcode reading device implementing the present invention, FIG. 3 shows a pulse train, and FIG.
An example of a failure detection circuit is shown.
Claims (1)
列に変換する信号比較回路と、前記信号比較回路
からのパルス列を解読する信号処理回路とを具備
するバーコード読取装置において、走査線上に対
応して前記走査装置に配置されるタイミングマー
クと、前記信号比較回路からの出力に含まれる前
記タイミングマークに相当するパルスを受ける再
トリガ型マルチバイブレータとを具備し、前記再
トリガ型マルチバイブレータの出力により故障検
知を行うことを特徴とするバーコード読取装置。 In a barcode reading device comprising a scanning device, a signal comparison circuit that converts an output from the scanning device into a pulse train, and a signal processing circuit that decodes the pulse train from the signal comparison circuit, the It is equipped with a timing mark placed on a scanning device and a retrigger type multivibrator that receives a pulse corresponding to the timing mark included in the output from the signal comparison circuit, and a failure is detected by the output of the retrigger type multivibrator. A barcode reading device that performs the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4505382U JPS58150150U (en) | 1982-03-30 | 1982-03-30 | Barcode reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4505382U JPS58150150U (en) | 1982-03-30 | 1982-03-30 | Barcode reader |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58150150U JPS58150150U (en) | 1983-10-07 |
| JPS6234360Y2 true JPS6234360Y2 (en) | 1987-09-02 |
Family
ID=30056093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4505382U Granted JPS58150150U (en) | 1982-03-30 | 1982-03-30 | Barcode reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58150150U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101013184B1 (en) * | 2008-08-22 | 2011-02-10 | 주식회사 아이센스 | Biosensor measuring apparatus and a method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53133454A (en) * | 1977-04-26 | 1978-11-21 | Nec Corp | Photoelectric detector |
-
1982
- 1982-03-30 JP JP4505382U patent/JPS58150150U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53133454A (en) * | 1977-04-26 | 1978-11-21 | Nec Corp | Photoelectric detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58150150U (en) | 1983-10-07 |
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