DE1987967U - PROJECTION APPARATUS. - Google Patents

Description

ÖiU (sOu ¥ tQJuu \ ju ty LJ ti ti ^ u iy / Uo υ uu \ / e »o

Telephone 2984 42 telex 05/22

0 8310 / 42hGbm C 2379

Optical work Dr. Staeble, Friedl & Co. KG, 892 Schongau / Lech

Projection apparatus

The innovation relates to a projection apparatus with a multi-lens Condenser and lens system in which the lens is raised and the condenser system converges the light rays of a projection lamp strongly to one another on the slide, film strip or to be displayed like throws.

It is known (German Auslegeschrift 1 153 188), projection apparatus to be provided with a multi-lens condenser and objective system and Use a short focal length lens. To correct the drop-off in the edge light If the lens is too high, »The rays of light become strong thrown converging by the condenser system on the light image.

Based on this prior art, it is now the task of the present innovation to kill a projection apparatus with improved performance. This task is solved according to the innovation, that the objective had a strongly elevated front lens and a weakly elevated one Has diass-side lens and that the condenser system is formed in such a way is that the angle of the strongly converging light rays of the projection lamp is greater than 50 °.

A projection apparatus according to the innovation has the main advantage on that, due to the short lens with low light intensity, a larger usable angle can be achieved than with a bright lens with a small overall length and that the lens has a very small vertex distance with the front of the lens to achieve good illumination is excessive.

- 3

Further details and features of the innovation are from the following Description of preferred embodiments and based on the accompanying drawings.

Show it:

1 shows a projection system with a three-lens condenser system and a three-lens lens;

FIG. 2 shows a four-lens condenser system with the same objective.

The projection system of Fig. 1 consists of three lenses 1, 2 and 3 of the Condenser system and three lenses 4, 5 and 6 of the objective. As a lamp For example, a narrow film lamp 7 or an iodine incandescent lamp 8 can be used will. The slide level is labeled 9.

Xn the following table, the digits in the left column, progressing from left to right, point to the lens surfaces r or the thicknesses d Mn, in column 2 the radii of curvature are given, in column 3 the distances between the surfaces and in column 4 refractive indices or . Abbe 'see numbers. The focal length of the condenser is f ^. = 31.41, the burning

_ 4 ■ -

width of the lens f _Q = 39.47. The angle of view of the lens is

carries 57.10 ".

r 1 r 2 r 3 r 4 r 5 r 6 r 7 r 8 r 9

d

d

d

d

d

d

d

d

d

r 10 r 11 r 12

d

d

- 96.622

- 40.650

OO

aspherical aspherical

- 150, + 17.007

- 105.870 -20.577 + 20,

OO ■ · '

■ - 18.728

0.1 26.5 5.0 21.5 41, -67 3.08 3.06 0, 78 3.80 .3, 08

nd = 1.5

nd = 1.5 (apex radius = - 31.5)

($ corner radius = + 45, 0) nd = 1.5

1.7440 / 44.90

1,698.9 / 30.05

1.6584 / 50.92

In Fig. 2 a further embodiment of the condenser is shown. the Reference numbers are chosen based on FIG. 1, with a 1 in front of the corresponding reference number of FIG. 1 has been placed in front. The associated Objectively is the same.

2379

In this embodiment, the two aspheres 12 and 13 are the same, which is favorable in terms of production. The data of the condenser are recorded in Table 2, the columns of which have the same meaning as the columns of FIG. 1 have. The downstream lens can have the same dimensions as in example 1.

19th d 19th - 35.106 Tabel 2 nd = l, 5 - 45.00) r 21 d 21 - 32, 300 10.0 + 45.00) r 31 d 31 - 50.448 0.1 nd = 1, 5 r 41 d 41 - 38,000 10, 0 r 51 d 51 +150,000 0.1 nd = 1, 5 r (Logs! Radius 5 ⁼ 61 d 61 aspherical 21, 5 r (Apex radius . = 71 d 71 aspherical 5, 0 nd = ■ 1, 5 r 81 d 81 -150,000 21.5 r 41.67

The limit values that can be achieved with the condenser of Examples 1 and 2 for the angle of the convergence rays are 57 to 58 °. The angle of convergence is more than 50 °. The occurring aberrations of the specified Condenser systems are relatively small * The short-

focal length lens is excessive, d. H. the front lens is larger than with a conventional lens of this focal length and aperture and the slide-side The lens is also chosen to be a bit larger. In this way, the edge zone is brightened and the projected area is well illuminated Area achieved. The light distribution from the center to the edge is therefore favorable. The lamp, condenser and lens are arranged in relation to one another in such a way that the The filament of the lamp completely fulfills the objective, with the result that the full Luminous flux is used. This allows with a projection lens low light intensity a high screen brightness can be achieved.

Claims (9)

I S protection claims 1. Projection apparatus with a multi-lens condenser and objective system, in which the lens is elevated and the condenser system the Light rays from a projection lamp converge strongly to one another the slide, film strip or the like to be reproduced throws, characterized that the objective (4, 5, 6 or 14, 15, 16) has a strongly raised front lens (6 or 16) and a slightly raised lens on the slide side (4 or 14) and that the condenser system (1, 2, 3 or 1.1, 12, 13) is designed such that the angle of the strongly converging to one another Light rays of the projection lamp (7, 8 or «17, 18) greater than 50 ° is. 2. Projection apparatus according to claim 1, characterized in that the Condenser system consisting of two minus lenses (11, 12) on the lamp side and two the same aspherical lenses (13) on the diasside. 3. Projection apparatus according to claim 2, characterized in that the The focal length of the condenser system is approximately 30.214 mm. r ί 4. Projection apparatus according to claim 3, characterized by the following Radii, distances and refractive indices progressing from the lamp to the lens: Radii: - 35.106, - 32.300, - 50.448, - 38.00, + 150,000, aspherical with apex radius - 45.00, aspherical with apex radius + 45.00, -150.000. . Distances: 10.0, 0.1, 10.0, 0.1, 21.5, 5.0, 21.5, 41.67. Refractive index: nd = 1.5. 5. Projection apparatus according to claim 1, characterized in that the Condenser system consists of a lamp-side minus lens (1) and two dissimilar, diass-side aspherical lenses (2 and 3). 6. Projection apparatus according to claim 5, characterized in that the The focal length of the condenser system is approximately 31.441 mm. 7. Projection apparatus according to claim 6, characterized by the following radii, Progressive distances and indices of refraction from the projection lamp to the lens: Radii: - 96.622, - 40, 650, «>, aspherical with apex radius - 31.5 _p asphäriseli mi ^ Seh ^ Ltelradiüs + 45.0, -150,000. Distances: 10.0, 0.1, 26.5,% A 21.5, 41.67. Refractive index: 1.5. 8. Projection apparatus according to one of claims 1 to 7, characterized in that that the lens has three lenses and a focal length of 39.47 mm and has an angle of view of 57.10 °. 9. Projektipnsapparat according to claim 8, characterized by the following radii, distances, refractive indices and Abbe's numbers progressing from the side of the slide to the projection wall: Radii +17.007, -105.870, -20.577, +20.577, co, -18.728, distances: 3, 08, 3, 06, 0.78, 3, 80, 3, 08. Refractive indices: 1.7440, 1.6989, 1.6584. Abbe's numbers: 44.90, 30.05, 50.92. H! Η wein This Unlerloge (Besolveibimg und SchuUcmspr.) Is * e / ulötzl incorporated ,. it gives way to the fourfold fossils of words that originally eir./je'-elchfeiv-Unifcf-iogeh.ob. The mchUif.he S * deu! Ung der AfovAieliung is »" not checked. The uisprüivilfc! ·· i-ji ^ tv ·:.: · -,! ■■> * »l), -> ii.rri.s «Nl * tm <fe« $! Ch in the office clasps. You köanoo je.ckiWil fciinft Hochweis «» fnss reohttl ·;? * ^ Inle.vs-jij give «'» i.ifrei öiii <> e $ * hi | #i werife *. A »rf M \ t <s% will be itiervon * gch ■■ Fotofe> pl # t> osfer-FIIm to the .öWtebe« prices. Otulsehes Potenlomt, Gbhlfe