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JPS63191022A - Electric balance with lcd-indicator having brightness regulating function - Google Patents

Electric balance with lcd-indicator having brightness regulating function

Info

Publication number
JPS63191022A
JPS63191022A JP31238087A JP31238087A JPS63191022A JP S63191022 A JPS63191022 A JP S63191022A JP 31238087 A JP31238087 A JP 31238087A JP 31238087 A JP31238087 A JP 31238087A JP S63191022 A JPS63191022 A JP S63191022A
Authority
JP
Japan
Prior art keywords
display
lcd
optoelectronic component
light source
brightness
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
Application number
JP31238087A
Other languages
Japanese (ja)
Other versions
JPH0625677B2 (en
Inventor
エーリッヒ・クノーテ
フランツ−ヨーゼフ・メルヒエル
クリスチアン・オルデンドルフ
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.)
Sartorius AG
Original Assignee
Sartorius AG
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 Sartorius AG filed Critical Sartorius AG
Publication of JPS63191022A publication Critical patent/JPS63191022A/en
Publication of JPH0625677B2 publication Critical patent/JPH0625677B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/16—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source
    • G09G3/18—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/18—Indicating devices, e.g. for remote indication; Recording devices; Scales, e.g. graduated
    • G01G23/36—Indicating the weight by electrical means, e.g. using photoelectric cells
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Indicating Measured Values (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 本発明は、計量データを出力するためのＬＣＤ−表示器
とＬＣＤ−表示器を照明するための光源と、光電構成素
子と光源の輝度を調整するための調整電子回路とを有す
る電気秤に関する。DETAILED DESCRIPTION OF THE INVENTION The invention provides an LCD-display for outputting metrological data, a light source for illuminating the LCD-display, and adjustment electronics for adjusting the brightness of the optoelectronic components and the light source. The present invention relates to an electric scale having the following.

従来の技術 この種の電気秤は公知であり、例えばドイツ連邦共和国
実用新案第８００２７２３号明細書に記載されている。BACKGROUND OF THE INVENTION Electric balances of this type are known and are described, for example, in German Utility Model No. 8002723.

この公知の実施例の欠点は、光電構成素子が周囲の明る
さしか検出しないため、例えば光源の老朽化が検出でき
ず、そのだめ周囲に対するコントラストが経年変化によ
り徐々に低下することである。光電構成素子の感度の変
化も同様に表示器のコントラストの変化を引き起こす。A disadvantage of this known embodiment is that, since the optoelectronic component only detects the ambient brightness, it is not possible to detect, for example, aging of the light source, so that the contrast with respect to the surroundings gradually deteriorates over time. Changes in the sensitivity of the optoelectronic components likewise cause changes in the contrast of the display.

発明が解決しようとする問題点 従って本発明の課題は、ＬＣＤ−表示器の輝度制御を次
のように構成することである。即ち、周囲の明るさも、
表示器を照明するための光源の実際の輝度も検出するこ
とができるように構成することである。Problem to be Solved by the Invention It is therefore an object of the invention to configure the brightness control of an LCD-display as follows. In other words, the surrounding brightness also
The present invention is configured so that the actual brightness of the light source for illuminating the display can also be detected.

問題点を解決するための手段 この課題は本発明により、光電構成素子をＬＣＤ−表示
セグメントの後方に配置し、この表示セグメントを調整
電子回路により所定時間。According to the invention, the object is achieved by arranging an optoelectronic component behind an LCD display segment, which display segment is adjusted for a predetermined time by means of a regulating electronic circuit.

透光性に、または非透光性に制御することにより解決さ
れる。This can be solved by controlling the problem to be transparent or non-transparent.

制御可能な光学的デートのように作用することが公知で
ある７　ＬＣＤ−表示セグメントが透光性に制御される
と、秤の周囲からの光も、ＬＣＤ−断器を照明するため
の光源の反射光も共に光電構成素子に当たる。しかしＬ
ＣＤ−表示セグメントが非透光性に制御されると、ＬＣ
Ｄ−表示器を照明するため光源の反射光のみが光電構成
素子に達する。それにより光電構成素子に接続された調
整電子回路は、周囲の明るさに関する情報もＬＣＤ＝表
示器を照明するための光源の輝朋に関する情報も得るこ
ととなる。It is known to act like a controllable optical date.7 When the LCD-display segment is controlled to be translucent, light from the surroundings of the scale also acts as a light source for illuminating the LCD-disconnector. The reflected light also strikes the optoelectronic component. But L
When the CD-display segment is controlled to be non-transparent, the LC
D - Only the reflected light of the light source reaches the optoelectronic component for illuminating the display. The regulating electronics connected to the optoelectronic component thus receive information both about the ambient brightness and about the brightness of the light source for illuminating the LCD display.

有利な実施例では、調整電子回路内で、商が、光電構成
素子の前方に位置する表示セグメントが非透光性である
期間内の光電構成素子の出力信号と、前方に位置する前
記表示セグメントが透光性である期間内の光電構成素子
の出力信号とから形成される。即ち、ＬＣＤ−表示器を
照明するための光源の輝度は、この商が所定値−例えば
０．５−に達するように調整される。この商形成により
、光電構成素子が万一老朽化した場合でも輝度調整の質
には影響が及ばない。何故ならば、光電構成素子の出力
信号の絶対値には依存しないからである。従って、非常
に安価な光電構成素子を特別な設計仕様なしに使用する
ことができる。In a preferred embodiment, in the regulating electronics, the quotient is the output signal of the optoelectronic component during a period in which the display segment located in front of the optoelectronic component is non-transparent and the display segment located in front of the optoelectronic component. is formed from the output signal of the optoelectronic component during the period in which it is transparent. That is, the brightness of the light source for illuminating the LCD-display is adjusted such that this quotient reaches a predetermined value, for example 0.5. Due to this quotient formation, even if the optoelectronic component becomes obsolete, the quality of the brightness adjustment is not affected. This is because it does not depend on the absolute value of the output signal of the optoelectronic component. Therefore, very inexpensive optoelectronic components can be used without special design specifications.

実施例 本発明を以下模式図に基づいて説明する。Example The present invention will be explained below based on schematic diagrams.

第１図には電気秤のケーシング１、秤量物を収容するた
めの秤量皿２、ＬＣＤ−表示器３、及び例えば風袋計量
と２つの計量領域を切換るための操作キー７と８が示さ
れている。第２図にもその細部の示されているＬＣＤ−
表示器３は秤量結果を表示するための７セグメント型文
字４と秤量結果の禁位を表示するためのマトリクス５′
を有する。その際、このマトリクスは、例えば第１図の
ｇ”記号５のような下の突き出る文字も表示できるよう
に構成されている。また例えば”　Ｋｇ”あるいは”ｃ
ｔ”のような２文字の単位も表示できる。さらにＬＣＤ
＝表示器３は付加的セグメント６を有し、そのセグメン
ト６の後方には第１図と第２図には図示されていない光
電構成素子が設けられている。ＬＣＤ−表示器３内の付
加的セグメント６の位置及びその形状と大きさはこの場
合任意であり、構造的必要性に応じて選択することがで
きる。例えば付加的表示セグメントもｇ″の形状を有す
ることができ、それにより単位用の表示シンボル５とし
て同時に用いることができるならば、マトリクス５′を
省略することができる。FIG. 1 shows a casing 1 of an electric balance, a weighing pan 2 for accommodating the weighed object, an LCD display 3 and operating keys 7 and 8 for switching between, for example, tare weighing and two weighing areas. ing. The LCD, whose details are also shown in Figure 2.
The display device 3 includes 7-segment type characters 4 for displaying the weighing results and a matrix 5' for displaying the scale of the weighing results.
has. In this case, this matrix is constructed in such a way that it can also display lower protruding letters, such as, for example, the g" symbol 5 in FIG. 1. Also, for example, "Kg" or "c
2-character units such as “t” can also be displayed.Furthermore, the LCD
=The display 3 has an additional segment 6, behind which an optoelectronic component, not shown in FIGS. 1 and 2, is provided. The position of the additional segment 6 in the LCD-display 3 and its shape and size are arbitrary in this case and can be selected depending on the structural needs. For example, the matrix 5' can be omitted if the additional display segment can also have the shape g'' and thus be used at the same time as the display symbol 5 for the unit.

光電構成素子９の位置は第６図に示されている。付加的
表示セグメント６の直ぐ後方にＬＣＤ−表示器３が設け
られている。さらにＬＣＤ−表示器を照明するための光
源１２と反射シェード１５と表示器を均等に照明するた
めの曇ガラス１６が示されている。照明ユニットは模式
的にのみ図示されている。何故ならば照明ユニットの有
利な構成は当業者にとっては容易にできるからである。The position of the optoelectronic component 9 is shown in FIG. Immediately behind the additional display segment 6 an LCD display 3 is provided. Also shown are a light source 12 for illuminating the LCD-display, a reflective shade 15 and a frosted glass 16 for evenly illuminating the display. The lighting unit is shown only schematically. This is because advantageous configurations of the lighting unit are readily available to those skilled in the art.

光電構成素子９は、表示セグメント６が非透光性に制御
された時、光源１２の光の一部のみを、例えばＬＣＤ−
表示器３の板の境界面後方における反射によって受ける
ように配設されている。表示セグメント６が透光性に制
御された時は、秤の周囲からＬＣＤ−表示器３に当る光
も付加的に受ける。The optoelectronic component 9 transmits only a portion of the light of the light source 12 when the display segment 6 is controlled to be non-transparent, e.g.
It is arranged so that it is received by reflection at the rear of the boundary surface of the plate of the display device 3. When the display segment 6 is controlled to be translucent, it additionally receives light that falls on the LCD display 3 from the surroundings of the scale.

光電構成素子９の出力信号の評価は第４図にゾロツク回
路図に基づき示されている。通常の計量器電子回路はさ
しあたシ、測定値検出器１０、アナログ及び／又はディ
ジタル信号処理装置１１と測定値表示器４のみで示しで
ある。The evaluation of the output signal of the optoelectronic component 9 is shown in FIG. 4 based on a Zorock circuit diagram. The conventional meter electronics is shown for the moment only with a measured value detector 10, an analog and/or digital signal processing device 11 and a measured value display 4.

何故ならはそれらは本発明にとって１喪なものではない
からである。輝度調整のだめの調整電子回路はブロック
１３により構成される。調整電子回路は光電構成素子９
の出力信号を線路１７を介して受信し、この信号を交互
に２つのサンプルアンドホールド素子１８および１９に
送出する。ここで切換器２０はＬＣＤ−表示器６に対す
る制御回路２１と結合している。表示セグメント６が非
透光性に制御されると、光電構成索子９の出力信号はサ
ンプルアンドホールド素子１８に供給される。従って、
ここでは光源１２の輝度に比例する信号が得られる。し
かしながら表示セグメント６が透光性に制御されると、
光電構成素子９の出力信号はサンプルアンドホールド素
子１９に供給される。従って、そこでは周囲の明るさ分
だけより高い信号が得られる。サンプルアンドホールド
回路１９には分圧器２２が後置接続されており、この分
圧器はサンプルアンドホールド回路１９の出力信号を、
例えば半分に低減ないし分圧する。この低減ないし分圧
された信号とサンプルアンドホールド素子１８の信号は
調整増幅器２３の差動入力側に供給される。この調整増
幅器は光源１２を制御する。ここで調整増幅器２３は公
知のように、光源１２の供給電圧を、２つの入力信号の
差が零になるまで追従制御するよう構成されている。This is because they are not essential to the present invention. The adjustment electronics for the brightness adjustment reservoir is constituted by block 13. The regulating electronics are optoelectronic components 9
via a line 17 and sends this signal alternately to two sample-and-hold elements 18 and 19. The switch 20 is here connected to a control circuit 21 for the LCD display 6. When the display segment 6 is controlled to be non-transparent, the output signal of the optoelectronic component 9 is fed to a sample-and-hold element 18. Therefore,
Here, a signal proportional to the brightness of the light source 12 is obtained. However, when the display segment 6 is controlled to be translucent,
The output signal of optoelectronic component 9 is fed to a sample-and-hold element 19 . Therefore, a higher signal is obtained there by the amount of surrounding brightness. A voltage divider 22 is connected downstream of the sample-and-hold circuit 19, and this voltage divider divides the output signal of the sample-and-hold circuit 19 into
For example, reduce the pressure by half or partial pressure. This reduced or voltage-divided signal and the signal of the sample-and-hold element 18 are supplied to the differential input side of the adjustment amplifier 23. This conditioning amplifier controls the light source 12. Here, the adjustment amplifier 23 is configured, in a known manner, to follow-up control the supply voltage of the light source 12 until the difference between the two input signals becomes zero.

例えば周囲の明るさが上昇すると、サンプルアンドホー
ルド素子１９の信号も上昇し、一方すンプルアンＶホー
ルド素子１８の信号は一定に留まる。それにより調整増
幅器゛２３は光源１２の供給電圧を、２つの入力信号が
再び同じになって差が零になるまで高める。同じことが
次のよう序場合にも行なわれる、即ち例えば光源１２が
老朽化して、同じ供給電圧では比較的に少ない明るさに
なる場合にも同じことが行なわれる。２つのサンプルア
ンドホールド素子１８と１９の信号は老朽化によって同
じ量だけ低下するが、しかし、分圧器２２のため、この
低下は調整増幅器の２つの入力側２４と２５とでは異な
って作用する。つまり入力側２４の信号の方が入力ｌ１
１４２５の信号よりも強い。そのため上の記載と同じよ
うに、調整増幅器２３は供給電圧を光源の輝度損失が補
正されるまで高める。For example, as the ambient brightness increases, the signal of the sample-and-hold element 19 also increases, while the signal of the sample-and-hold element 18 remains constant. The regulating amplifier 23 thereby increases the supply voltage of the light source 12 until the two input signals are again the same and the difference is zero. The same thing happens in the following case, ie, for example, when the light source 12 becomes obsolete and, with the same supply voltage, becomes relatively less bright. The signals of the two sample-and-hold elements 18 and 19 degrade by the same amount due to aging, but because of the voltage divider 22 this degradation acts differently on the two inputs 24 and 25 of the regulating amplifier. In other words, the signal on the input side 24 is the input l1
Stronger than the 1425 signal. As described above, the regulating amplifier 23 therefore increases the supply voltage until the brightness loss of the light source is compensated for.

それに対し、光電構成素子９のｆｌｊえば老朽化による
感度低下は作用を及ぼさない。感度が例えば９０％に低
下すると、サンプルアンドホールド素子１８の信号も、
サンプルアンドホールド素子１９の信号も、分圧器２２
の出力側の信号も共に９０％に低下して、調整増幅器２
３の入力側における電圧差零は変化しない。On the other hand, if the optoelectronic component 9 is flj, the decrease in sensitivity due to aging has no effect. When the sensitivity decreases to, for example, 90%, the signal of the sample-and-hold element 18 also becomes
The signal of the sample-and-hold element 19 is also passed through the voltage divider 22.
The signals on the output side of both decrease to 90%, and the adjustment amplifier 2
The zero voltage difference at the input side of 3 remains unchanged.

分圧器２２の理想的な調整は勿論、所望のコントラスト
比に依存する。しかしＬＣＤ−表示器６後方の光電構成
素子９の配置構成にも依存する。何故ならばこの幾可的
配首構成が反射率と共に、照明装置の光源１２から光電
構成素子９に達する光の微小な部分を定めるからである
。The ideal adjustment of voltage divider 22 will of course depend on the desired contrast ratio. However, it also depends on the arrangement of the optoelectronic components 9 behind the LCD display 6. This is because this geometrical arrangement, together with the reflectance, defines a small fraction of the light that reaches the optoelectronic component 9 from the light source 12 of the lighting device.

輝度調整回路は上の記載ではアナログ調整回路として説
明したが、勿論調整回路をディジタルで構成することも
できる。それにより第４図の構成素子１８−２３はＡ　
／　Ｄ変換器とディジタル調整系に置換えられる。この
ディジタル調整系は勿論、測定値検出器１０に対する信
号処理装置１１のディジタル機能も同時に行うマイクロ
プロセッサ内に、プログラムパケットとして設けること
もできる。Although the brightness adjustment circuit has been described as an analog adjustment circuit in the above description, it is of course possible to configure the adjustment circuit digitally. As a result, components 18-23 in FIG.
/ Replaced with a D converter and digital adjustment system. This digital adjustment system can of course also be provided as a program packet in a microprocessor which simultaneously performs the digital functions of the signal processing device 11 for the measured value detector 10.

発明の効果 本発明により、周囲の明るさや光源の輝度が変化しても
それが検出され、それによりＬＣＤ　−表示器の輝度が
視認性の点で最適に調整されるような電気秤が得られる
。また検出に用いる光電構成素子の感度が低下してもそ
の影響が出ないように構成されている。Effects of the Invention The present invention provides an electric scale in which changes in ambient brightness and the brightness of the light source are detected, so that the brightness of the LCD display is adjusted optimally in terms of visibility. . Furthermore, the structure is such that even if the sensitivity of the photoelectric component used for detection decreases, this effect will not occur.

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

第１図は電気秤の斜視図、第２図は付加的表示セグメン
トを有するＬＣＤ−表示器の平面図、第６図はＬＣＤ−
表示器と照明装置の断面図、第４図は電気秤と輝度調整
のだめの調整電子回路のブロック回路図である。 １・・・ケーシング、２・・・秤量皿、３・・・ＬＣＤ
−表示器、４・・・文字、５・・・単位記号、６・・・
付加的表示セグメンｌ−，７，８・・・操作キー、９・
・・光電構成素子、１０・・・測定値検出器、１１・・
・ディジタル信号処理装置、１２・・・光源、１３・・
・ブロック、１７・・・線路、１８．１９・・・サンプ
ルアンドホールド素子、２０・・・切換器、２１・・・
制御回路、２２・・・分圧器、２３・・・調整増幅器、
２４．２５・・・差動入力側 ＦＩＧ、２1 is a perspective view of the electric balance, FIG. 2 is a top view of the LCD-display with additional display segments, and FIG.
FIG. 4 is a cross-sectional view of the display and illumination device, and a block circuit diagram of the adjustment electronic circuit of the electric scale and the luminance adjustment reservoir. 1... Casing, 2... Weighing pan, 3... LCD
- Display, 4...Character, 5...Unit symbol, 6...
Additional display segments l-, 7, 8...operation keys, 9.
...Photoelectric component, 10...Measurement value detector, 11...
・Digital signal processing device, 12...Light source, 13...
・Block, 17...Line, 18.19...Sample and hold element, 20...Switcher, 21...
Control circuit, 22... Voltage divider, 23... Adjustment amplifier,
24.25...Differential input side FIG, 2

Claims (1)

【特許請求の範囲】 １、秤量データを出力するためのＬＣＤ−表示器とＬＣ
Ｄ−表示器を照明するための光源と、光電構成素子と光
源の輝度を調整するための調整電子回路とを有する電気
秤において、光電構成素子（９）はＬＣＤ−表示器（６
）の後方に配設されており、該ＬＣＤ−表示器は調整電
子回路（１３）により所定時間、透光性に、また非透光
性に制御されることを特徴とする電気秤。 ２、調整電子回路（１３）は光源（１２）の輝度を、光
電構成素子（９）の前方に位置する表示セグメント（６
）が非透光性である期間内の光電性構成素子（９）の出
力信号と、前方に位置する前記表示セグメントが透光性
である期間内の光電構成素子（９）の出力信号とからの
商が所定値に達するよう制御する特許請求の範囲第１項
記載の電気秤。[Claims] 1. LCD-display and LC for outputting weighing data
In an electric balance with a light source for illuminating the D-indicator and an adjustment electronics for adjusting the brightness of the optoelectronic component and the light source, the optoelectronic component (9) is connected to the LCD-indicator (6).
), the LCD-display is controlled by a regulating electronic circuit (13) to be translucent or non-transparent for a predetermined period of time. 2. The adjustment electronics (13) adjusts the brightness of the light source (12) to the display segment (6) located in front of the optoelectronic component (9).
) is non-transparent, and the output signal of the optoelectronic component (9) during a period in which the display segment located in front is transparent. The electric balance according to claim 1, wherein the electric balance is controlled so that the quotient of the quotient reaches a predetermined value.
JP62312380A 1986-12-11 1987-12-11 Electric scale having LCD-display with brightness adjustment function Expired - Lifetime JPH0625677B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863642288 DE3642288C1 (en) 1986-12-11 1986-12-11 Electrical balance having an LCD display with brightness control
DE3642288.6 1986-12-11

Publications (2)

Publication Number Publication Date
JPS63191022A true JPS63191022A (en) 1988-08-08
JPH0625677B2 JPH0625677B2 (en) 1994-04-06

Family

ID=6315938

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62312380A Expired - Lifetime JPH0625677B2 (en) 1986-12-11 1987-12-11 Electric scale having LCD-display with brightness adjustment function

Country Status (3)

Country Link
JP (1) JPH0625677B2 (en)
CH (1) CH673156A5 (en)
DE (1) DE3642288C1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19524605C5 (en) * 1995-07-06 2009-10-15 Robert Bosch Gmbh Method for adjusting the brightness of a display and car radio
GB0402640D0 (en) * 2004-02-06 2004-03-10 Pelikon Ltd Ambient light sensor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48107067U (en) * 1972-03-17 1973-12-12
JPS5491090U (en) * 1977-12-09 1979-06-27

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5422797A (en) * 1977-07-21 1979-02-20 Seiko Epson Corp Liquid crystal display unit
DE8002723U1 (en) * 1980-02-02 1980-06-04 Sartorius Gmbh, 3400 Goettingen ELECTRONIC SCALE WITH DIGITAL DISPLAY

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48107067U (en) * 1972-03-17 1973-12-12
JPS5491090U (en) * 1977-12-09 1979-06-27

Also Published As

Publication number Publication date
DE3642288C1 (en) 1988-06-09
CH673156A5 (en) 1990-02-15
JPH0625677B2 (en) 1994-04-06

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