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Von
Jekatha Karunaharamoorthy
Was ist ein Overhead-Projektor?
 Ein Overhead-Projektor ist ähnlich wie ein Diaprojektor.
 Ein Overhead-Projektor wird auch OH-Projektor
genannt.
 Mit einem OH-Projektor kann man etwas, das auf einer
Folie steht, auf einer Fläche (z.B. eine Wand) einem
Publikum vergrößert zeigen.
2
Wie funktioniert ein OH-Projektor?
Als Lichtquelle benutz man häufig eine
Halogenlampe.
Um die Lichtausbeute zu steigern, befindet
sich im Brennpunkt ein Hohlspiegels .
Das von der Lampe und vom Hohlspiegel
reflektierte Licht geht durch einer
sogenannte Fresnellinse.
Die Fresnellinse leuchtet die großflächige
Folienvorlage und übernimmt die
Funktion des Kondensors (vgl.
Diaprojektor).
Die Fresnellinse wird durch eine darüber
liegende Glasplatte geschützt, auf der die
Folie aufgelegt wird.
Das Projektionsobjekt hat die Aufgabe, die
Folie scharf abzubilden.
Der Umlenkungsspiegel dient zur
Richtungsänderung des vom Objektiv
kommenden Licht.
3
QUELLEN
 WIKIPEDIA.ORG
 LEIFI.PHYSIK.UNI-MUENCHEN.DE
 GOOGLE.DE
 NAWI BUCH : S.169
 MEIN KOPF
 MEIN BRUDER
 EIN PHYSIKSTUNDENT
 PHYSIK BUCH VON HR. JEROSCH
SO SIEHT EIN OH-PROJEKTOR AUS 
4
DANKE FÜR EURE AUFMERKSAMKEIT!
5

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Overhead / OH Projektor Vortrag Schule

  • 2. Was ist ein Overhead-Projektor?  Ein Overhead-Projektor ist ähnlich wie ein Diaprojektor.  Ein Overhead-Projektor wird auch OH-Projektor genannt.  Mit einem OH-Projektor kann man etwas, das auf einer Folie steht, auf einer Fläche (z.B. eine Wand) einem Publikum vergrößert zeigen. 2
  • 3. Wie funktioniert ein OH-Projektor? Als Lichtquelle benutz man häufig eine Halogenlampe. Um die Lichtausbeute zu steigern, befindet sich im Brennpunkt ein Hohlspiegels . Das von der Lampe und vom Hohlspiegel reflektierte Licht geht durch einer sogenannte Fresnellinse. Die Fresnellinse leuchtet die großflächige Folienvorlage und übernimmt die Funktion des Kondensors (vgl. Diaprojektor). Die Fresnellinse wird durch eine darüber liegende Glasplatte geschützt, auf der die Folie aufgelegt wird. Das Projektionsobjekt hat die Aufgabe, die Folie scharf abzubilden. Der Umlenkungsspiegel dient zur Richtungsänderung des vom Objektiv kommenden Licht. 3
  • 4. QUELLEN  WIKIPEDIA.ORG  LEIFI.PHYSIK.UNI-MUENCHEN.DE  GOOGLE.DE  NAWI BUCH : S.169  MEIN KOPF  MEIN BRUDER  EIN PHYSIKSTUNDENT  PHYSIK BUCH VON HR. JEROSCH SO SIEHT EIN OH-PROJEKTOR AUS  4
  • 5. DANKE FÜR EURE AUFMERKSAMKEIT! 5