DE3319399A1 - LIGHT MIXING CHAMBER FOR A PHOTOGRAPHIC ENLARGEMENT OR COPIER - Google Patents

Description

Light mixing chamber for a photographic · :: magnification

or Kopiergerä ι;

The invention relates to a light mixing chamber for a photographic enlarger or copier, with diffusely reflecting the light emitted by a light source Walls, a light inlet opening and a light outlet located in front of an original drunk mmg.

From DE-OS 2 258 591 a color enlarger with a light mixing chamber made of a metal housing is known, the interior walls of which are lined with solid, white, foamed display panels and which have an opening opening extending over the bottom of the metal housing . Iv the latter is.? Ine 1. i ^ hlz ^ i c? ^l \\ ä'- · ir. * -, --errüb ^ Di ff i < ^r "; rmc - oeicc diffuser arranged without brcchcinio effect, through

1!) Which the i.ü der jL.i.chLn.i.schkaininor genäbctitc LLcht: bein

BATH ORIGINAL

advice.

May 18, 1983 A 2189 / B 3050

Patent Department 3319399

Passing through is dispersed so that it is subsequently can expose an original image. The translucent The diffuser tapers from a thick, circular center / part outwards to a thin, circular one Edge part and has a different degree of diffusion, i. H. the diffusion is stronger in the middle part and gradually weakens towards the edge. In this way, the decrease in light intensity becomes partially balanced from the center of the light beam to its edge parts. The light losses - in this one Light mixing chambers are however fair.

Aue der Dü '~ ^{ >. 2 8 OH J 63 Is a magnifying device • ■ • Hk.innt ■ b ^: which the central-edge loss of light intensity is compensated for by using a ring or circular light source, which is placed near a diffusing screen t. This known device can only be used for black-and-white enlargements, since the required ring-shaped fluorescent tube provides a ■ discontinuous spectrum.

cc.hl: t.-P Ii:.!: it. .'in photographic enlarger Jin- l-.chwarxv / oiss- or color materials known, whose J jehhn'i sclik ur.mer in the I.ichtaustrittsöfnung a "Diffusor II -, s e" designated, translucent opij. vcuOi B-i '-'. oi-l iitt. The light output and the homogeneity of colors of this device are good; the Aa * luminescence of the edge parts of the Bi lii -rvrliiji- -freh ^ ί ·. ^; η ~ ί gen behind the illumination of the υ ji ^ . '( --lri -.... .ir ,; i Lt. Mru.; -.,

Pat Kz / Bg May 18, 1983 A 21897E. 3050

Patent department

The invention is based on the object of a light mixing chamber for a photographic enlargement or To create a copier that has a high luminous efficiency and uniform color distribution compared to the previously known Facilities achieved improved illumination.

This object is achieved according to the invention by the features specified in claim 1 as characterizing. In the case of negligibly low loss of light, the illumination of the edge parts of the original image is achieved in this way significantly improved, while the original center is slightly attenuated. It is particularly noteworthy here that the more even Auslouchtimg for all Blettdenwer!.,. remains and d.M-iibo also the Color homogeneity is further improved.

The lenses arranged in the region of the light exit opening advantageously have essentially the same shape, a plano-convex design generally being preferred. It has also proven to be advantageous if the air gap between the lenses Ci ¹ ^ ₁ , «. H. on the order of 1 mm is chosen.

The lenses used according to the invention can consist of a - !. organic or organic. Glass ^, ready!.: Be; she preferably consist of slightly cloudy polymeth.ylmeth .-- 3 cry! at and are well-known in technology.

BATH ORIGINAL

Patent department

Pat Kz / Bg

05/18/1983

A 2189 / B 3050

Further features and advantages of the invention emerge from the following description of a Drawing illustrated embodiment. In the drawing, a light mixing chamber is shown schematically in Section shown.

A not shown lighting system for comprises a photographic enlarger or copier a light mixing chamber 10, which by means of a bracket 11 is attached in the lighting system. The light mixing chamber 10 has a U-shaped carrier 12 on, on the ceiling surface of which the bracket 11 is mounted. In the carrier 12 is a box-shaped housing 13 inserted: urd connected to the carrier 12, for example glued, the two legs of the U-shaped support 12 encompass the upper part of the Housing 13, which over the legs of the carrier 12, downward and partially over the open ^ .Seiten same stands out. The housing 13 is made in a known manner from polyalkene foam or from foam of a substitute Polyalkenes produced with diffusely reflective inner surfaces.

The Tracer \ i and there:; · Housing 1? are each provided with a circular opening 14, 14 '-. / i-sc'-it in which a heat protection filter 15 is arranged. The light source not shown here by airier ο Lieb :: hits after passing through the light. 'nr..ri L r': öu ': iungen l- ^A -. j '4' onto a reflector 16 passing through the white; am. ι i crtc inner surface of the the Lichti i. 1 urt i. i: ·> .Jl "iTUig, ■ - '* .3 ·.: · ^.

BATH ORIGINAL

Pat Kz / Bg

05/18/1983

A 2189 / B 3050

Patent department

of the carrier 12 is formed. The reflection properties of the reflector 16 are chosen so that they approximately correspond to the scattering power of the inner wall surfaces of the housing 13 made of polyalkene foam. In this way, the light rays are reflected multiple times in the light mixing chamber 10 and are therefore intensely mixed.

The end of the housing 13, which is open at the bottom, forms an approximately square light exit opening 17 for the diffuse light generated in the light mixing chamber 10. In the area of the light exit opening 17, two plano-convex lenses 18, 18 'are arranged in such a way that the convex surfaces ) eAf.-t lens 18, 18' are directed onto an image original 19. The lenses 1.8, 18 'are made of organic glass, for example polymethyl methacrylate. They are slightly cloudy and have both diffuse and, to a lesser extent, focusing properties. When viewed from above, both lenses 18, 18 'are square, the lens 18 facing the original 19 being approximately? Has larger dimensions, so that their edge surfaces can easily be attached to the underside of the housing 13. The lens 18 also has integrally formed angle webs 20 on its flat surface at each corner, on which the inner lens 18 ¹ ,

2 ^L j for example: duron Verk. The width of the latter corresponds to the internal dimensions of the housing 13. The height of the angular webs 20 it, t so ire choose L, r'.al: ^ wischua Jm Leiden L.iirs-n 18 and 18 'a narrow air L. "[ . ·.:. J1: / Ί of. ^ Wa 1 mm D ic Iu. In.! Area of the

; <opt If - :. 1.-j! - ii "c ^! ": - s? I '!.!; ■■! —ι 1 H, 1 S' ^ eUi 1 ctt t will.

PAD ORiGSNAL

Patent department

Pat Kz / Bg

05/18/1983

A 2189 / B 3050

An illumination is achieved with the arrangement according to the invention of the edge parts of the original 19 reached, which over a wide aperture area almost to the Illumination in the center of the picture comes close .- ^

Pat Kz / Bg

05/18/1983

B 2189 / B 3050

33193G9

List of reference symbols

10 Light mixing chamber 11th Retaining bracket 12th carrier 13th casing 14.14 ' Light entry opening 15th Heat protection filter 16 reflector 17th Light exit opening 18.18 ' lens 19th Image template 20th Angled bridge 21 Air gap

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Claims (1)

Pat Kz / Bg - May 18, 1983 A 2189 / B 3050 Expectations 1. Light mixing chamber for a photographic enlargement or copier with walls diffusely reflecting the light emanating from a light source, with a light inlet opening and with a light outlet opening located in front of an original, characterized in that in the area of the light exit opening (17) at least two one convex lens {"18, 18 '), each having a surface facing the original image (19), are arranged, which are slightly cloudy and have correspondingly diffuse properties. 2. 'Light mixing chamber according to claim 1, characterized in that the lenses (18, 18') plankorvi. >; an - ~: & c: b i! JoI. -ind. ¹ PY ■ ' - ■ ':' ■. Pat Kz / Bg May 18, 1983 A 2189 / B 3050 '3. Light mixing chamber according to claim 1 or 2, d a - characterized in that the Lenses (18, 18 ') are designed to be plano-convex. 4. light mixing chamber according to claim 1 or 2, characterized in that the Lenses (18,18 ') are concavo-convex. 5. light mixing chamber according to claim 1 or 2, d a characterized in that the Lenses (18, 18 ') are biconvex, with the more strongly curved surfaces facing the original image (19) si rhi. 6. Light mixing chamber according to one or more of the preceding claims, characterized in that that a narrow air gap (21) is provided between the lenses (18, 18 '). ^ - BATH ORIGINAL