DE1069899B

DE1069899B -

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Publication number: DE1069899B
Application number: DENDAT1069899D
Authority: DE
Publication date: 1959-11-26

Description

DEUTSCHESGERMAN

kl. 42 h 23/03kl. 42 h 23/03

INTERNAT. KL. G 03 bINTERNAT. KL. G 03 b

PATENTAMTPATENT OFFICE

B 35377IX/42ÜB 35377IX / 42Ü

ANMELDETAG: 19.APRIL1955REGISTRATION DATE: APRIL 19, 1955

BEKANNTMACHUNG
DER ANMELDUNG
UND AUSGABE DER
AUSLEGESCHRIFT: 26. NOVEMBER 1959NOTICE
THE REGISTRATION
AND ISSUE OF THE
EDITORIAL: NOVEMBER 26, 1959

Die Erfindung betrifft eine Beleuchtungseinrichtung für Bildwerfer mit Hochdruck-Gasentladungslampe, deren Licht von einem Spiegel und durch eine astigmatische Optik auf ein Bildfenster geleitet wird. Es sind Bildwerfer bekannt, bei denen eine torische Linse zwischen die Lampe und das Bildfenster geschaltet ist. Der Lichtverlust ist bei einer solchen Einrichtung beträchtlich; man kann sie nur für kleine Aperturen verwenden. Größere Lichtströme für Hochleistungsbildwerfer können damit nicht in Lampengehäusen üblicher Größe gewonnen werden.The invention relates to a lighting device for projector with high pressure gas discharge lamp, whose light is directed from a mirror and through astigmatic optics onto a picture window. It image projectors are known in which a toric lens is connected between the lamp and the image window. The loss of light in such a device is considerable; they can only be used for small apertures. Larger luminous fluxes for high-performance projector can therefore not be more common in lamp housings Size can be gained.

Diese Nachteile werden nach der Erfindung dadurch vermieden, daß die astigmatische Optik aus zwei räumlich voneinander getrennten astigmatischen Gliedern besteht.These disadvantages are avoided according to the invention in that the astigmatic optics are spatially composed of two separate astigmatic members.

Diese Anordnung erlaubt es, den Strahlengang so zu formen, daß das von der Lampe ausgehende Licht bei beliebig zu bemessender Länge des Lampengehäuses so gut wie vollständig aufgefangen, dem Bildfenster mit beliebiger Apertur zugeleitet und daher mit nur geringen Verlusten durch das Objektiv auf die Leinwand geworfen wird. Lampenhaus und Bildwerfer können dadurch den bei Kohlebogenlampen entsprechender Leistung üblichen Größen angeglichen werden, ohne daß Nachteile in der Lichtausbeute auftreten.This arrangement makes it possible to shape the beam path so that the light emanating from the lamp at Any length of the lamp housing to be measured almost completely absorbed, the picture window with any aperture and therefore with only small losses through the lens onto the screen is thrown. The lamp house and projector can thus correspond to those of carbon arc lamps Power can be adjusted to the usual sizes without disadvantages in the light yield.

Ein Ausführungsbeispiel des Erfindungsgegenstandes ist in der Zeichnung dargestellt. Es zeigtAn exemplary embodiment of the subject matter of the invention is shown in the drawing. It shows

Fig. 1 einen senkrechten Schnitt durch die Beleuchtungseinrichtung, 1 shows a vertical section through the lighting device,

Fig. 2 einen Grundriß des Strahlenganges,Fig. 2 is a plan view of the beam path,

Fig. 3 bis 5 Darstellungen des Lichtbogenbildcs in verschiedener Form.Fig. 3 to 5 representations of the arc picture in various forms.

In einem Gehäuse 1 ist eine Lampe 2 untergebracht. Sie ist eine Hochdruck-Gasentladungslampe; ihr Lichtbogen 3 befindet sich in der optischen Achse 4 des Bildwerfers zwischen den Elektroden. Der Lampenkörper erstreckt sich in erster Linie in senkrechter Richtung.A lamp 2 is accommodated in a housing 1. It is a high pressure gas discharge lamp; their arc 3 is located in the optical axis 4 of the projector between the electrodes. The lamp body extends primarily in the vertical direction.

Die entgegengesetzt zu einem Bildfenster 5 austretenden Strahlen der Lampe 2 werden von einem Hauptspiegel 6 aufgefangen, der den Lichtstrom der Lampe in waagrechter Richtung in einem Bereich von 180° erfaßt und in senkrechter Richtung nur zwei Aussparungen 7 und 8 hat, durch welche nicht dargestellte, die Lampe haltende Teile treten können. Der verbleibende Teil des Hauptspiegels ist groß genug, um auch in senkrechter Richtung alle austretenden Lichtstrahlen auf seiner Seite aufzufangen, da diese von den Enden der Elektroden 9 und 10 auf einen Winkel beschränkt sind, der kleiner als 180° ist.The rays of the lamp 2 exiting in the opposite direction to a picture window 5 are taken from a main mirror 6 captured the luminous flux of the lamp in the horizontal direction in a range of 180 ° detected and has only two recesses 7 and 8 in the vertical direction, through which, not shown, parts holding the lamp can step. The remaining part of the main mirror is big enough to also in a vertical direction to collect all emerging light rays on his side, since these come from the ends of the electrodes 9 and 10 are limited to an angle which is smaller than 180 °.

Dem Hauptspiegel gegenüber liegt ein Hilfsspiegel .V¹ 11, der auf entsprechende Weise den gesamten zum Bildfenster hin gerichteten Lichtstrom der Lampe erfaßt. Er ist ein Kugelspiegel und bildet den Lichtbogen in sich selbst ab. Das Bild 12 des Lichtbogens ist.Opposite the main mirror is an auxiliary mirror .V ¹ 11, which in a corresponding manner detects the entire luminous flux of the lamp directed towards the picture window. It is a spherical mirror and depicts the arc in itself. The image 12 of the arc is.

Beleuchtungseinrichtung für Bildwerfer
mit Hochdruck-GasentladungslampeLighting device for projector
with high pressure gas discharge lamp

Anmelder:Applicant:

Eugen Bauer G.m.b.H.,Eugen Bauer G.m.b.H.,

Stuttgart-Untertürkheim,Stuttgart-Untertürkheim,

Beim Inselkraftwerk 10At the island power plant 10

Dipl.-Phys. Walter Dinkelacker, Stuttgart-W,Dipl.-Phys. Walter Dinkelacker, Stuttgart-W,

und Josef Schleifer, Krumbach (Schwab.),and Josef Schleifer, Krumbach (Schwab.),

sind als Erfinder genannt wordenhave been named as inventors

dabei umgekehrt und ergänzt den etwa dreieckiger! Lichtbogen (seine Abbildung am Filmfenster zeigt Fig. 3) zu einem Rechteck (Fig. 4), das etwa die gleiche Breite wie das Bildfenster 5 hat, aber wesentlich höher als dieses ist. 7the other way around and complements the roughly triangular one! Arc (his picture on the film window shows Fig. 3) to a rectangle (Fig. 4), which has approximately the same width as the image window 5, but much higher than this is. 7th

Der Hauptspiegel 6 hat die Form eines Ellipsoids; würde also ein genaues Bild dieses Rechtecks entsprechend Fig. 4 auf das Bildfenster werfen. Dabei. würde ein großer Teil des Lichtes ungenutzt bleiben. Tn den Strahlengang sind deshalb zwei Linsen 13 und 14 eingeschaltet. Die Linse 13 sitzt im Innern des Gehäuses 1 und hat auf ihrer der Lampe 2 zugekehrten Seite eine konkave sphärische Fläche 15. Diese Fläche' dient dazu, den Abbildungsmaßs.tab des Hauptspiegels' insgesamt auf das in zweckmäßiger Entfernung angebrachte Bildfenster 5 abzustimmen. Die zweite Seite der Linse 13 ist eine zylindrisch konkave Fläche 16 mit waagrechter Achse. Sie ändert also im Grundriß gesehen den Strahlenlauf nicht, während sie in senkrechter Richtung die vom Spiegel her verhältnismäßig stark konvergierenden Strahlen auseinanderlenkt.The main mirror 6 has the shape of an ellipsoid; so would an accurate picture of this rectangle accordingly Throw Fig. 4 onto the image window. Included. a large part of the light would remain unused. Two lenses 13 and 14 are therefore switched on in the beam path. The lens 13 sits inside the housing 1 and has a concave spherical surface 15 on its side facing the lamp 2. This surface ' serves to measure the image dimension tab of the main mirror ' overall to match the image window 5 attached at an appropriate distance. The second side the lens 13 is a cylindrical concave surface 16 with a horizontal axis. So it changes seen in plan the path of the rays is not, while in the vertical direction that of the mirror is comparatively strong deflects converging rays.

Die Linse 14 ist in eine dem Bildfenster 5 zugekehrte Öffnung 17 des Gehäuses 1 eingesetzt. Sie ist beiderseits konvex zylindrisch mit waagrechter Achse.The lens 14 is inserted into an opening 17 of the housing 1 facing the image window 5. She is mutual convex cylindrical with horizontal axis.

In der Oberseite des Gehäuses 1 ist eine Feuerschutzklappe 18 drehbar gelagert. Sie kann mit einem Handhebel 19 in den Strahlengang geschwenkt werden; ihr scheibenförmiger Teil 20 tritt dabei zwischen die Linsen 13 und 14. Entfernt man die Klappe aus dem Strahlenbereich, so wird dieser Teil bis nahe an eine Seitenwand des Gehäuses 1 herangeschwenkt. Er ist zu diesem Zweck gegenüber der Drehachse der Feuerschutzklappe 18 seitlich versetzt.In the top of the housing 1, a fire flap 18 is rotatably mounted. You can use a hand lever 19 are pivoted into the beam path; its disk-shaped part 20 occurs between the lenses 13 and 14. If the flap is removed from the radiation area, this part becomes close to one The side wall of the housing 1 is pivoted inwards. For this purpose, it is opposite the axis of rotation of the fire damper 18 laterally offset.

909 650/237909 650/237

Claims

The light bundle emanating from the arc 3 and its mirror image 12 is not influenced in the horizontal direction by the lens 14, so that it falls onto the image window 5 with a suitable aperture. In the vertical direction, the rays are strongly compressed by the lens 14. They hit the image window with approximately the same aperture; the resulting image of the arc 3 and its mirror image 12 is so strongly compressed in the perpendicular direction to the images 3 'and 12' (Fig. 5) that the rectangle consisting of these images corresponds approximately to the shape of the image window 5 and it is uniform covered on all edges. The device according to the invention thus collects all the light emanating from the lamp on the picture window, with such an aperture that it can be captured by a projection lens 21 without losses and used for projecting images. As can be seen from FIGS. 4 and 5, the superimposition of the arc 3 and its image 12 partially compensates for the brightness distribution of the light source. A remnant of non-uniformity is still present. The astigmatic difference of the lenses 13 and 14 is therefore chosen so that this non-uniform luminance distribution is compensated for in the space of the picture window. Such a difference cannot be realized satisfactorily with only one astigmatic member. Rather, this would have to be measured primarily according to how the transformation of the arc image is to be carried out, would be tied to a certain point in the lamp house and would have to have a certain focal length that would lead to an image with an average still usable aperture for vertical and horizontal directions the lowest possible loss of light is necessary. In the case of the illustrated lighting device, features necessary for this effect can be distributed over the two aspherical lenses 13 and 14; one is therefore more independent in their dimensioning and can adapt the length of the lamp house as well as the location of the lenses to other conditions without having to forego the most favorable aperture. In this way, the light from the lamp is used in the best possible way, and the outer dimensions of the lamp housing can be adapted to the size gradations customary for lamp housings with other light sources. It is not necessary for the lens 13, as in the exemplary embodiment described, to be designed as a toric lens. The side 15 can also be flat. In some cases this will be sufficient, in others a special, spherical lens can be added. The lens 14 can also be shaped in such a way that it also influences the horizontal beam path. The device can also be used for differently shaped gas discharge lamps whose arc shape deviates from the shape of the picture window and whose luminous flux is to be recorded as completely as possible. P Λ T I: N T Λ N S l> H Π C H Li:

1. Lighting device for projector with high pressure gas discharge lamp, whose light from a mirror and is guided through astigmatic optics onto a picture window, characterized in that, that the astigmatic optics consist of two spatially separated astigmatic optics Is composed of limbs.

2. Lighting device according to claim i, characterized in that the main mirror the Has the shape of an ellipsoid.

3. Lighting device according to claim 2, characterized in that one of the astigmatic Limbs with a spherical member is combined to form a toric lens.

4. Lighting device according to one of claims 2 or 3, characterized in that the Light reception angle of the mirror in the vertical direction is smaller than in the horizontal direction and that the astigmatic members influence the light beam only in the vertical direction.

5. Lighting device according to claim 4, characterized in that the light receiving angle of the mirror is 180 ° horizontally.

6. Lighting device according to one of claims 1 to 5, characterized in that the Mirror is an auxiliary mirror opposite, which the light reception angle not detected by the mirror at least nearly detected and drafts an inverted image of the arc in the plane of the same.

7. Lighting device according to claim 6, characterized in that the auxiliary mirror is a Spherical mirror is.

8. Lighting device according to one of claims 1 to 7, with a light shutter, characterized in that the flap is in the beam path between the two astigmatic Limbs can be pivoted.

9. Lighting device according to one of claims 1 to 8, characterized in that the astigmatic difference of the two astigmatic members is chosen so that the non-uniform Luminance distribution of the arc in the space of the picture window is balanced.

1 sheet of drawings