JPS59230143A - Light leakage detecting device of led indicator - Google Patents
Light leakage detecting device of led indicatorInfo
- Publication number
- JPS59230143A JPS59230143A JP9040783A JP9040783A JPS59230143A JP S59230143 A JPS59230143 A JP S59230143A JP 9040783 A JP9040783 A JP 9040783A JP 9040783 A JP9040783 A JP 9040783A JP S59230143 A JPS59230143 A JP S59230143A
- Authority
- JP
- Japan
- Prior art keywords
- light
- led indicator
- led display
- measuring means
- light leakage
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はＬＥＤ（Ｌｉｇｈｔ Ｅｍｉｔｔｉｎｇ Ｄｉ
ｏｄｅ）を発光素子とした表示器のセグメントの光もれ
を検出する光もれ検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention uses LED (Light Emitting Di
The present invention relates to a light leakage detection device for detecting light leakage from a segment of a display device using a light-emitting element.
一般に、ＬＥＤ表示器ａには、第１図に示すように、セ
グメントｂ、ｂ、・・・を７つ「日」の字型に組合せて
数字表示できるようにしたものがある。Generally, as shown in FIG. 1, some LED display devices a have seven segments b, b, .
このようなＬＥＤ表示器ａではセグメントｂ、ｂ、・・
・のフレームが曲っていたり、組立て精度が不充分であ
ると、各セグメントｂ、ｂ、・・・間で光もれが生じ、
本来発光していないセグメントｂ、ｂ、・・・までも発
光しているように認識され、数字や文字を読み誤ったり
する。この不具合を防止するため新たに製品化されたＬ
ＥＤ表示器ａではセグメントｂ、ｂ、・・・に光もれが
ないか予じめ検査する必要がある。従来、ＬＥＤ表示器
ａの光もれの検出は各セグメントｂ、ｂ、・・・を発光
させるなどして全て目視で行なわれている。このため、
光もれの許容度の判定が一定せずあいまいになり、製品
品質が安定しない、また、判定のために多くの労力を要
するなどの問題がある。In such an LED display a, segments b, b,...
・If the frame is bent or the assembly accuracy is insufficient, light leakage will occur between segments b, b,...
Even segments b, b, etc. that are not supposed to emit light are recognized as emitting light, leading to erroneous reading of numbers and letters. A newly commercialized L to prevent this problem.
In the ED display a, it is necessary to check in advance whether there is any light leakage in the segments b, b, . Conventionally, detection of light leakage from the LED display device a has been carried out visually by emitting light from each segment b, b, . . . . For this reason,
There are problems in that the determination of the tolerance level for light leakage is inconsistent and ambiguous, product quality is not stable, and a lot of effort is required for determination.
本発明は上記の問題点に鑑みてなされたものであって、
ＬＥＤ表示器のセグメントの光もれを自動的に検査でき
るようにして従来の問題点を解消することを目的とする
。The present invention has been made in view of the above problems, and includes:
To solve conventional problems by automatically inspecting light leakage of segments of an LED display.
本発明はこのような目的を達成するため、発光源からＬ
ＥＤ表示器の裏面に光を投光し、投光された光のうちＬ
ＥＤ表示器を通過した光量の多少を光量測定手段で測定
することによりＬＥＤ表示器の光もれを検出するように
している。In order to achieve such an object, the present invention provides L
Light is projected onto the back of the ED display, and L of the projected light is
Light leakage from the LED display is detected by measuring the amount of light passing through the LED display using a light amount measuring means.
以下、本発明を一実施例について第２図に基づいて詳細
に説明する。同図において、符号１は光もれ検出装置、
２は光もれの検査対象となるＬＥＤ表示器である。なお
、２ａはこのＬＥＤ表示器２のフレーム、２ｂはこのフ
レーム２ａ上のセグメントの対応位置に設けた発光用の
チップ、２ｃはケース、２ｄは透明樹脂である。Hereinafter, one embodiment of the present invention will be explained in detail based on FIG. 2. In the figure, code 1 is a light leakage detection device;
2 is an LED display to be inspected for light leakage. Note that 2a is a frame of this LED display 2, 2b is a light emitting chip provided at a position corresponding to a segment on this frame 2a, 2c is a case, and 2d is a transparent resin.
上記光もれ検出装置１は、ＬＥＤ表示器２の裏側（第２
図上下方）からこのＬＥＤ表示器２に光を投光する発光
源４と、このＬＥＤ表示器２を通過した上記発光源４か
らの光量を測定する光量測定手段６とを備え、両者４、
６は互いに対向して配置されている。発光源４は本例の
場合ランプであるが、その他発光するものであれば適宜
選定できる。また、光量測定手段６は、光量に対応して
出力が変化するフォトトランジスタやフォトダイオード
等の受光素子で構成されている。そして、この光量測定
手段６には、増幅器８、判定回路１０および表示器１２
が順次接続されている。さらに、発光手段４と光量測定
手段６との間には横壁１４ａと縦壁１４ｂとからなる遮
蔽板１４が設けられ、この遮蔽板１４の横壁１４ａに形
成した貫通孔１６にＬＥＤ表示器２がその裏面を発光源
４に向けて仮止めされる。The light leak detection device 1 is located on the back side of the LED display 2 (the second
A light emitting source 4 that emits light to the LED display 2 from above and below (in the figure) and a light amount measuring means 6 that measures the amount of light from the light source 4 that has passed through the LED display 2, both 4,
6 are arranged opposite to each other. The light emitting source 4 is a lamp in this example, but any other source that emits light can be selected as appropriate. Further, the light amount measuring means 6 is composed of a light receiving element such as a phototransistor or a photodiode whose output changes depending on the amount of light. The light amount measuring means 6 includes an amplifier 8, a determination circuit 10, and a display 12.
are connected sequentially. Furthermore, a shielding plate 14 consisting of a horizontal wall 14a and a vertical wall 14b is provided between the light emitting means 4 and the light amount measuring means 6, and the LED indicator 2 is installed in a through hole 16 formed in the horizontal wall 14a of the shielding plate 14. It is temporarily fixed with its back surface facing the light emitting source 4.
従って、ＬＥＤ表示器２のセグメントの光もれを検出す
るには、ＬＥＤ表示器２のセグメントを点灯するのでは
なくて、まず、発光源４を発光し、これによりＬＥＤ表
示器２の裏面を照射する。この照射した光の一部はＬＥ
Ｄ表示器２のセグメントを通過して光量測定手段６で受
光される。光量測定手段６は受光量に応じた出力を増幅
器８を介して判定回路１０に送出する。従って、ＬＥＤ
表示器２のフレーム２ａに曲りや浮き上りなどの光もれ
の原因があるとＬＥＤ表示器２を通過する光量が増大す
るので、これに対応して光量測定手段６からの出力も大
きくなる。判定回路１０には、ＬＥＤ表示器２が良品な
場合の光量測定手段６からの出力の基準レベルが予じめ
記憶されている。Therefore, in order to detect light leakage in the segments of the LED display 2, first, instead of lighting the segments of the LED display 2, the light source 4 emits light, thereby illuminating the back side of the LED display 2. irradiate. Part of this emitted light is LE
The light passes through the segments of the D display 2 and is received by the light amount measuring means 6. The light amount measuring means 6 sends an output corresponding to the amount of received light to the determination circuit 10 via the amplifier 8. Therefore, the LED
If there is a cause of light leakage such as bending or lifting in the frame 2a of the display 2, the amount of light passing through the LED display 2 will increase, and the output from the light amount measuring means 6 will correspondingly increase. The determination circuit 10 stores in advance a reference level of the output from the light amount measuring means 6 when the LED display 2 is of good quality.
従って判定回路１０は各ＬＥＤ表示器２ごとに、光量測
定手段６からの出力を予じめ記憶された基準レベルと比
較し、光もれが基準以上であるならば表示器１２のラン
プを点滅などする。Therefore, the judgment circuit 10 compares the output from the light amount measuring means 6 with a pre-stored reference level for each LED indicator 2, and if the light leakage is higher than the reference level, the lamp of the indicator 12 blinks. etc.
以上のように本発明によればＬＥＤ表示器に投光する発
光源と、ＬＥＤ表示器を通過した光量を測定する光量測
定手段とを設けたので、ＬＥＤ表示器のセグメントの光
もれを自動的に検査できる。As described above, according to the present invention, since the light emitting source that emits light to the LED display device and the light amount measuring means that measures the amount of light that has passed through the LED display device are provided, light leakage from the segments of the LED display device is automatically detected. can be inspected.
従って検査に要する労力を大幅に軽減できるばかりでな
く、光のもれの量も検出できるので、良品不良品の判定
も容易となり、品質の安定化にも寄与するという優れた
効果が得られる。Therefore, not only can the labor required for inspection be significantly reduced, but also the amount of light leakage can be detected, making it easy to determine good products and defective products, and contributing to quality stabilization, which is an excellent effect.
第１図はＬＥＤ表示器の全体を示す斜視図、第２図は本
発明の一実施例を示すＬＥＤ表示器の光もれ検出器の構
成図である。
１・・・光もれ検出器、２・・・ＬＥＤ表示器、４・・
・発光源、６・・・光量測定手段。FIG. 1 is a perspective view showing the entire LED display, and FIG. 2 is a configuration diagram of a light leak detector of the LED display showing an embodiment of the present invention. 1... Light leak detector, 2... LED indicator, 4...
- Light emitting source, 6... light amount measuring means.
Claims (1)
投光するランプ等の発光源と、このＬＥＤ表示器を通過
した前記発光源からの光量を測定する光量測定手段とを
備えていることを特徴とするＬＥＤ表示器の光もれ検出
装置。(1) It is equipped with a light emitting source such as a lamp that projects light onto the LED display from the back side of the LED display, and a light amount measuring means that measures the amount of light from the light source that has passed through the LED display. A light leak detection device for an LED display, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9040783A JPS59230143A (en) | 1983-05-21 | 1983-05-21 | Light leakage detecting device of led indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9040783A JPS59230143A (en) | 1983-05-21 | 1983-05-21 | Light leakage detecting device of led indicator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59230143A true JPS59230143A (en) | 1984-12-24 |
| JPH0479409B2 JPH0479409B2 (en) | 1992-12-15 |
Family
ID=13997727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9040783A Granted JPS59230143A (en) | 1983-05-21 | 1983-05-21 | Light leakage detecting device of led indicator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59230143A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289234A (en) * | 2020-03-18 | 2020-06-16 | 三门县点帆环保科技有限公司 | Detection apparatus for vehicle air conditioner indicator lamp area |
| CN111307432A (en) * | 2020-02-29 | 2020-06-19 | 三门县点帆环保科技有限公司 | Cold and warm indicator light strip detection device on automobile air conditioner |
| KR20200137958A (en) * | 2019-05-31 | 2020-12-09 | 주식회사 아도반테스토 | Test apparatus, test method and program |
| US11788885B2 (en) | 2021-02-26 | 2023-10-17 | Advantest Corporation | Test apparatus, test method, and computer-readable storage medium |
| US11800619B2 (en) | 2021-01-21 | 2023-10-24 | Advantest Corporation | Test apparatus, test method, and computer-readable storage medium |
| US12130324B2 (en) | 2022-01-11 | 2024-10-29 | Advantest Corporation | Test apparatus, test method, and computer-readable storage medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55100154U (en) * | 1978-12-29 | 1980-07-12 |
-
1983
- 1983-05-21 JP JP9040783A patent/JPS59230143A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55100154U (en) * | 1978-12-29 | 1980-07-12 |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200137958A (en) * | 2019-05-31 | 2020-12-09 | 주식회사 아도반테스토 | Test apparatus, test method and program |
| US11293966B2 (en) | 2019-05-31 | 2022-04-05 | Advantest Corporation | Test apparatus for determining pass or fail of LEDs, test method and computer-readable medium |
| CN111307432A (en) * | 2020-02-29 | 2020-06-19 | 三门县点帆环保科技有限公司 | Cold and warm indicator light strip detection device on automobile air conditioner |
| CN111289234A (en) * | 2020-03-18 | 2020-06-16 | 三门县点帆环保科技有限公司 | Detection apparatus for vehicle air conditioner indicator lamp area |
| US11800619B2 (en) | 2021-01-21 | 2023-10-24 | Advantest Corporation | Test apparatus, test method, and computer-readable storage medium |
| US11788885B2 (en) | 2021-02-26 | 2023-10-17 | Advantest Corporation | Test apparatus, test method, and computer-readable storage medium |
| US12130324B2 (en) | 2022-01-11 | 2024-10-29 | Advantest Corporation | Test apparatus, test method, and computer-readable storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0479409B2 (en) | 1992-12-15 |
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