DE1847980U - COVER FOR MEASURING INSTRUMENTS. - Google Patents
COVER FOR MEASURING INSTRUMENTS.Info
- Publication number
- DE1847980U DE1847980U DEH34041U DEH0034041U DE1847980U DE 1847980 U DE1847980 U DE 1847980U DE H34041 U DEH34041 U DE H34041U DE H0034041 U DEH0034041 U DE H0034041U DE 1847980 U DE1847980 U DE 1847980U
- Authority
- DE
- Germany
- Prior art keywords
- layer
- cover
- measuring instruments
- plexiglas
- electrically conductive
- 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
- 229920005372 Plexiglas® Polymers 0.000 claims description 10
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 10
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 claims description 4
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 2
- 230000003667 anti-reflective effect Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000007786 electrostatic charging Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
- G01D5/34707—Scales; Discs, e.g. fixation, fabrication, compensation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Laminated Bodies (AREA)
Description
Neue Beschreibung zur Gebrauchsmusteranmeldung H 34 041/42 d Gm "Abdeckscheibe für Meßinstrumente" Die Hersteller von Meßinstrumenten, insbesondere elektrischer Meßinstrumente, gehen mehr und mehr dazu über, anstelle der bisher verwendeten Abdeckscheibe aus Glas, durch die man die Meßskala beobachtet, solche aus PLEXIGLAS (als Warenzeichen geschützt) zu benutzen. PLEXIGLAS-Abdeckscheiben haben aber den Nachteil, daß sie sich elektrostatisch stark aufladen, wodurch die Anzeige sowohl feiner als auch robuster Instrumente beeinflußt wird und infolgedessen Fehlmessungen auftreten können.New description for utility model registration H 34 041/42 d Gm "cover disk for measuring instruments "Manufacturers of measuring instruments, especially electrical ones Measuring instruments are being used more and more, instead of the cover plate previously used made of glass, through which the measuring scale can be observed, those made of PLEXIGLAS (as a trademark protected). PLEXIGLAS cover disks have the disadvantage that they become very electrostatically charged, which makes the display both finer and finer Robust instruments is influenced and as a result incorrect measurements can occur.
So ist es beispielsweise möglich, daß infolge der elektrostatischen Aufladung des PLEXIGLASES der Zeiger an irgendeiner Stelle stehen bleibt, ohne daß ein Meßstrom fließt.So it is possible, for example, that as a result of the electrostatic Charging of the PLEXIGLASE the pointer stops at any point without a measuring current flows.
Es ist bekannt, daß diese Schwierigkeiten dadurch beseitigt werden können, daß die der Skala zugewandte Oberfläche der PLEXIGLAS-Abdeckscheibe mit einer elektrisch leitfähigen Schicht versehen wird. Die Schwierigkeit bestand aber bisher darin, daß die Schichten zu viel Licht absorbierten und auch der sattweiße Farbton der Skala nach Gelb verschoben wurde, wodurch ein schmutziger Eindruck entsteht. Durch das im folgenden beschriebene Verfahren ist es gelungen, einen ausreichenden elektrischen Widerstand bei hoher Transparenz und praktisch verschwindender Verfärbung des von der Skala zurückgestreuten Lichtes zu erreichen.It is known that this overcomes these difficulties that the surface of the PLEXIGLAS cover panel facing the scale with an electrically conductive layer is provided. But the difficulty was there up to now that the layers absorbed too much light and also the deep white The hue of the scale has been shifted to yellow, creating a dirty impression. The method described below made it possible to obtain a sufficient electrical resistance with high transparency and practically vanishing discoloration of the light scattered back from the scale.
Zu diesem Zweck wird auf die der Meßskala zugewandte Oberfläche der
Abdeckscheibe aus PLEXIGLAS eine sehr dünne Schicht aus Molybdän aufgedampft, auf
die eine reflexvermindernde Schicht aufgebracht wird. Hierfür hat sich insbesondere
Magnesiumfluorid und Siliciumoxyd bewährt. Die Transparenz solcher
PLEXIGLAS-Abdeckscheiben
nach der Erfindung beträgt etwa 88 %. Wenn man die Dicke der aufgedampften dielektrischen
Schicht aus Magnesiumfluorid oder Siliciumoxyd so wählt, daß vorwiegend grünes und
blaues Licht hindurchgelassen wird, so kann man den Farbton der Transmission der
Schichtenkombination grau gestalten. Der elektrische Widerstand beträgt
In der Figur ist eine Abdeckscheibe aus PLEXIGLAS gemäß der Erfindung dargestellt. Auf die PLEXIGLAS-Scheibe A ist einseitig eine sehr dünne Schicht B aus Molybdän aufgedampft, auf diese wiederum eine reflexvermindernde Schicht C. In der Figur sind die Dicken der Schichten B und C übertrieben stark dargestellt.In the figure is a cover made of PLEXIGLAS according to the invention shown. On one side of the PLEXIGLAS pane A there is a very thin layer B vapor-deposited from molybdenum, on top of which a reflection-reducing layer C. In the figure, the thicknesses of layers B and C are shown exaggerated.
Das Aufdampfen der elektrisch leitfähigen Schicht ist besonders vorteilhaft geeignet für PLEXIGLAS. Die Erfindung beschränkt sich selbstverständlich nicht nur auf PLEXIGLAS-Abdeckscheiben, sondern es können auch andere transparente Abdeckscheiben für Meßinstrumente aus Kunststoff zwecks Beseitigung elektrostatischer Störungen mit einer sehr dünnen Molybdänschicht bedampft werden, auf die eine reflexvermindernde Schicht, beispielsweise aus Magnesiumfluorid oder Siliciumoxyd aufgedampft ist.The vapor deposition of the electrically conductive layer is particularly advantageous suitable for PLEXIGLAS. Of course, the invention is not limited only on PLEXIGLAS cover panes, but other transparent cover panes can also be used for measuring instruments made of plastic for the purpose of eliminating electrostatic interference be vaporized with a very thin molybdenum layer on which a reflection-reducing Layer, for example of magnesium fluoride or silicon oxide is vapor-deposited.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEH34041U DE1847980U (en) | 1960-01-20 | 1960-01-20 | COVER FOR MEASURING INSTRUMENTS. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEH34041U DE1847980U (en) | 1960-01-20 | 1960-01-20 | COVER FOR MEASURING INSTRUMENTS. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1847980U true DE1847980U (en) | 1962-03-08 |
Family
ID=33002903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEH34041U Expired DE1847980U (en) | 1960-01-20 | 1960-01-20 | COVER FOR MEASURING INSTRUMENTS. |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1847980U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3233301A1 (en) * | 1982-09-08 | 1984-03-08 | Robert Bosch Gmbh, 7000 Stuttgart | Arrangement for eliminating reflection from displays |
-
1960
- 1960-01-20 DE DEH34041U patent/DE1847980U/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3233301A1 (en) * | 1982-09-08 | 1984-03-08 | Robert Bosch Gmbh, 7000 Stuttgart | Arrangement for eliminating reflection from displays |
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