HU180333B - Reflecting mirror for decreasing the luminous rays being in the infrared region - Google Patents

Abstract

Industrially manufactured elliptical reflectors reduce the infra-red component of the output light beam. The reflectors are a combination of glass elliptical reflector (1) with the light source at the focus point (4) and a front reflector (6) with an output beam window (7). The elliptical focussing reflector (1) has an interference filter layer coating (5) which is transparent to infra-red, and some red light, (10) as emitted by the light source (4). The coating (5) permits light with a wavelength greater than 780nm to pass through. The elliptical reflector (1) is fronted by another reflector (2) which has a central output window (7). The light cone (8,9,10) from the light source (4) is either reflected off the side of the elliptical reflector (8,11) through the output window (7), reflected by the front mirror (2) for further reflection (9,16) by the elliptical reflector (1) through the front window (7). The front reflector (2) reflects all wavelengths so that the infra-red (15) can be filtered out by the elliptical reflector (1). The output window (7) also has a filter coating (3) to reflect the infra-red (12,13).

Description

BACKGROUND OF THE INVENTION The present invention relates to a light reflector structure which allows the light beams in the infrared range to be reduced or reduced. modifying the spectrum of the projected light. The present invention relates to a reflective ellipsoidal glass mirror and a reflective spherical mirror ·· or. consists of a combination of a mirror.

In the center of the spherical mirror there is an exit window for passing the directional light, and a light source is located in one of the focal points of the anti-slip mirror.

Mirror projectors generally use electrochemically mirrored aluminum projecting mirrors. The mirror is paraboloidal or ellipsoidal, depending on the purpose of the reflector. In theater projectors, the use of a spherical mirror is common. The usual material of the counter-mirror is aluminum, which is polished mechanically or electrolytically from the inside. In addition to visible light beams that are useful for illumination, conventional infra-red light generates a significant amount of heat to the illuminated person and burns the film during a slide show. In some cases, infra-rays are used to filter out infra rays with different color filters on projectors, but they also filter out a large portion of the visible light rays, absorbing them / having poor efficiency /. The filter projectors used up to now have an approx. They also emit 30% of the heat they produce *. /E.g. A 2000 W reflector radiates 600 W of heat onto the surface. /

SUMMARY OF THE INVENTION The use of reflector mirrors

-2180.333 that allow the projector to emit only visible light or a certain range of it, but not emit infrared light that causes heat.

Description of the technical background:

There has been an old quest to use heat reflective layers to reduce the heat radiation from light sources. Such solutions are known e.g. US 3,221,198 and US 3,400,288. patents where the sodium vapor discharge lamp bulb for this ohne is oldloxld, respectively. uses indium oxide coatings *. U.S. Patent No. 3,931,536. According to patent for this purpose separated vacuo T10 ₂ -S10 _two layer system is used having a higher reflectivity in the range 800 to 1200 nm infrared radiation than 95%.

The projector lamps also sought to eliminate the infrared component from the projected beam of the lamp, resulting in a so-called. cold-mirrored projection lamps, in which the layers of interference are transmitted to the projection surface of the lamps by means of a parabolic or other projection surface, which only transmits infrared light and reflects only visible light. Such a solution ^{1 is} disclosed in U.S. Patent No. 3,162,785 .......

It is known that sealed-beam projection lamps use indlum · oxide and silicon dioxide systems doped with heat reflection tin on the front face of the lamp. Such a solution is described in U.S. Patent No. 4,127,789.

No. HU 173,286. U.S. Pat. A portion of the metal support is coated with a non-pigmented glass-like layer and has an interference layer system for separating visible and infrared radiation. According to this solution, the mirror carrier is metal. One disadvantage of this solution is that it is expensive to produce a metal substrate with the proper properties, since it is required to be form-proof, non-tensioning and have a good bond with the enamel coating. Otherwise, the absorbent enamel layer will separate from the metal and / or metal. flaking. The problem of producing a suitable mihoaeg metal substrate is an additional operation compared to the conventional glass substrate. Another serious difficulty is that the metal substrate has to be enamelled in optical quality. There are also drawbacks to this solution _; Because infrared radiation absorbs itself, it becomes radiant, so cooling is inevitable. The theater or theater. In studio technique there is a further need for good color rendering of the light sources or for a specific color temperature / eg. 3200 K, or 3400 K / r.

This can only be achieved with incandescent lighting with a short lamp / 15-3O ¹¹ / life. Any applied haircut will cause a large loss (around 30%).

It is an object of the present invention to overcome the technical difficulties described above, to realize commercial production, and to meet the demands of the user industry to a large extent.

Summary of the Invention

None of the above solutions can solve the problem of heat-proofing the theater illumination, while simultaneously correcting the azine spectrum. We have worked to meet such technical demands

-3180.333 discloses a projector mirror construction of the present invention which enables the complete elimination of infrared light beams in a substantially complete manner. The reflective glass of the range is made of an ellipsoidal mirror and a reflective spherical or opposed glass. it consists of a combination of mirrors. The mirror construction is characterized in that the ellipsoidal mirror is coated with an interferenol filtering system which transmits infrared radiation and increases the color level of the reflected light, while the window part of the spherical mirror mirror is fitted with an infrared radiation system. _t .______________._________ _

Further advantages of the present invention will be explained in more detail below with reference to the accompanying drawings, which are as follows:

List of drawings

No. 1 figure:

Longitudinal sectional view of the projector mirror construction of the present invention. The construction consists of a combination of an ellipsoidal mirror and a spherical mirror.

No. 2 figure:

Another embodiment of the projector mirror construction of the present invention, wherein the ellipsoidal mirror has a color temperature elevation.

J.sz. figure:

Longitudinal sectional view of a projector mirror. It differs from Figure 2 in that there is a filter plate modifying the spectrum with a diameter not larger than the exit window.

No. 4 figure:

2 is a longitudinal sectional view of a projector mirror structure which differs from the arrangement of FIG. 2 in that a mirror with an exit window is located in the center of the plane of the minor axis. There is a color correction filter plate in front of the exit window.

No. 5 figure:

Transmission diagram of cold mirror with alternately evaporated low and high refractive index Zns / MgF ₂ or TiOg / SiOg 1-10 layers optical thickness / ^ / 4 to 440 nm. 11-20-Ig λ _2/4 and ^ ₂ = 610 nm, the layer 21 of optical thickness of? \ _2/8 ^to 1 · ^21-th layer of ZnS, or TLOG.

No. 6 ábrq:

Transmission diagram of the hot mirror, with 13 layers of ZnS / MgF ₂ or TiO ₂ / S10 ₂ applied, with the optical thickness of layers 1 and 13 being 88; the inserts are λ / 4 for λ = 1010 nra _e . First and last coat MgF ₂ or Si0 ₂ »

?.s. figure:

Transmission diagram of color temperature-enhancing cold mirror, which, in structure, as in the diagram of Fig. 5 * but with a, ', = 400 nm λ / 2 = 57 ° ^nm ·

-4180.333

β. this. figure:

A blue-screened pre-filter transmission diagram with 11 layers of Zno / IugFg or TlC ^ / S10O evaporated, of which layers 1 and II.-lk have an optical thickness>, / 8. for intermediate layers / 4 a = 600 nm and starting and finishing layers MgF ₂ Si0 ₂

Yellow? = 400 nm at purple color? = 550 nm.

The reflector mirrors of the present invention are illustrated in Figs

Referring to Figure 4, the following is described:

Figure 1:

The reflector of the ellipsoid 1 is made of transparent, heat-resistant glass, the inner surface of which is coated with an infrared transmission layer 5. The center of the spherical mirror 2 opposite the ellipse mirror 1 is at the focal point of the ellipse mirror 1. On the center circle surface 7 of the spherical mirror 2, an infrared reflective filter layer 3 is vaporized, while the surrounding reflective layer 2 has a reflective layer 6 over the entire spectrum. The layer 5 has the property of reflecting the visible rays 11 from the light rays 8 emanating from the light source 4 and allowing the infrared rays 10 to pass through. The portion of the light beam 12 from the light source 4 in the infrared region is reflected on the reflective layer 3. The reflected infrared ray 13 passes through the layer 5 of the ellipse mirror 1 so that the heat does not remain in the space between the mirrors. The visible beam 14 passes through the infrared mirror 3. The light beam 9 from the light source 4 is reflected on the reflective layer 6 of the spherical belt mirror 2 to the ellipse mirror 1, where the infrared rays 15 pass through, while the visible light rays 16 are reflected. The permeability curve of the filament system 5 of the ellipsoidal mirror 1 is shown in Figure 5, while the coating 3 of the surface 7 is shown in Figure 6.

Figure 4:

Another embodiment of the present invention will be described with reference to Figure 4.

The reflector for their ellipse 1 is made of transparent heat-resistant glass with an infrared transmission layer 5 on its inner surface. The elliptical mirror 1 extends down to the minor axis, where it is closed by a dichroic mirror 22 having a reflective layer 6 throughout the spectrum. In the center of the flat mirror 22 there is a circular window exit window 7, in front of which a flat plate 18 is placed on its surface with a spectrum modifying coating 21.

The ray of light 23 emanating from the helix 4 of the lamp 4 at the focal point of the ellipsoid 1 when encountered with the coating 5 of the ellipsoid 1 is further infrared 24 and the visible light 25 is reflected by F _? Reflecting towards the window and exiting the window 7, the filter 21 on the base 18 will have a modified spectrum depending on the characteristics of the filter 21.

If the 2? beam does not directly meet with one of the ellipsoidal surface, but the 22-plane mirror reflecting coating of 6, so that together with the infrared portion 28 reflektálódva - it goes like F _P had started out from. Thus, the pad 5 29 inírahúnyad Exit the system 30 while the visible light passing through the Fien after repeated reflektálódás in one ellipsoidal layer 5 along the _two half F 7 exits the window and the plane 18

Passing through the filter 21 of sheet -5180.333, it is also transformed into a beam of modified spectrum 31 and transmitted to the lens. Layer 5 -.-g Here again, Figure 5, layer 21 has the characteristic of Figure 6.

This solution, despite multiple reflections, is made possible by the fact that multiple reflections are allowed in dichroic systems because of the very small loss of '5%. This system is capable of producing a low oblique beam, which results in a favorable reduction in lens size.

Known methods for producing the above-mentioned selective interference mirrors are available. Reference is made to Dr. II. KOCII Moderné Wsrmeschutzelemente c. / Feingeratetechnik, 14th Vol. No. 2 Pages 50-60, 1965, and GB 775.002, GB 895-879, GB 1010 038, US 2 784 115, US 2 920 002, and U.S. Patent No. 794. The technical solutions disclosed in the patents.

Advantages of the construction

One of the advantages of the projector construction of the invention is that the surface, curvature, and shape of the low-yielding oxidation glass now meet the optical requirements required herein. Therefore, no separate surface treatment and preparation operations are required. Due to its high infrared transmission, the glass has the advantage that it does not become a secondary emitter. The paxaboloid, respectively. The cold mirror applied to an ellipsoidal mirror δ lamp significantly relieves infrared radiation. The radiation portion of the exit window without reflection is removed from the infrared component by the mirror or mirror combination placed in the eye. In this way, the light emitted from the reflector can be infrared up to max. Contains 5%. It cannot be emphasized enough how beneficial this is for a headlamp, where the illuminated person is exposed for a long time, possibly for hours, to this effect, which, when absorbed by the skin, accumulates and causes an increased sensation of heat.

A further advantage of the construction is that it has an approx. By 10%, the efficiency of the system is improved because the reflection coefficient of the cold mirror applied to the glass is higher than that of the metal mirrors. Another advantage is that the spectrum of the projected light can be modified, e.g. adjusts the brightness of the 2900 K lamp to 3200 K / ha when the reticle system 5 has the characteristic of Figure 7.

The following examples illustrate the practice of the invention:

Example 1

A theatrical follow-on reflector with a 650 W incandescent lamp according to Fig. 1, in which the layer system 5 of the ellipsoidal mirror 1 has the features shown in Fig. 7, which increases the luminous intensity of the lamp. The part 7, which also forms the same glass body as the spherical belt part 2, carries a heat reflective coating 3, a layer system according to Fig. 6, which reflects the remaining accompanying heat rays. Most of this comes from radiation coming directly from the lamp.

With this combination, virtually no infrared light is visible from the system.

This effect is illustrated in the table below, which, under the same conditions, changing the quality of the mirrors only by changing the quality of the mirrors,

-6180.333 elevations, T-values can be found in non-lens volumetric bun.

It can be seen from the table that with this solution the temperature of the illuminated surface is practically unchanged while Al _rt . using it, the temperature increase is significant / 1015 ° C /.

Temperature increase / T / using different mirrors as a function of distance / ambient temperature: 28 ° C /

Distance of the device 2 3 4 5 from an objective m 'T / ° C / 15 11 9 8 Al mirror Illuminated body temperature, 00 43 39 37 36 Cold and hot Λ T / o ₀ / 2 1.5 1 0.5 mirror / 5 »and Figure 6 according / The temperature of the illuminated body is ° C 50 29.5 29 28.5

Example 2

Theatrical 650W so-called. Description of the reflector system of the following reflector / Figure2/. The glass-supported ellipsoid mirror 1 has an aperture diameter of 135 mm, depth of 100 mm and geometric parameters a = 128 mm; b = 70 mm; c = 107.0 mm, the spectrum range over 780 nm is coated on the ^"ea 5 95% interference with light transmission system. The 4 lamps with a 2Γ * spiral are in focus. most of its light / 50-60% / without heat rays, F _? to and out of the device through the lens. The portion not reflecting directly from the surface of the ellipsoid 1 is reflected by the spherical center F 2 and thus being returned to the ellipsoid mirror ¹ through F.

Reflected from this heat beam, it exits the device through the exit window 7, which is coated with the heat mirror 3 of FIG.

Since in this case the interference system 5 has the transmission property according to Fig. 7, it modifies the visible spectrum leaving the lamp to reach the desired 3200 K after reflection of the original 2900 K slip.

Example 3

The reflector mirror system is shown in Fig. 3 ·. is shown. In front of the exit window 7 there is a flat glass 18, not less than the intersection of the light beam, in this case 50 min in diameter, on which the transmission characteristic of the layer system 21 is shown in FIG. sat.7180.333 rlntl. as a result, the resulting light is blue.

d. example

The reflector system of the reflector corresponds to Figure 4, where a scintillator 22 is located at the opening of the ellipse. The feoraetrial parameters of the ellipse are: a = 128 mm, b = 70 mm, o = 10, 7.16 mm. the elliptical mirror with a mirror reflector now extends to the plane containing the minor axis of the ellipse and the 140 mm 0-ü 22 mirror is located in this plane.

In the center of the scintillator 22 there is a 50 mm 0 optically transparent exit window 7, while the rest of the surface reflects across the entire spectrum. In this way, a 15-beam exit beam can be produced by the lake. The transmission characteristic of the layer system 21 on the flat glass 18 in front of the outlet 7 is shown in Figure 8.

Claims (6)

Patent claims A projector mirror for reducing projected rays in the infrared region, consisting of a mirror detached on an ellipsoidal glass substrate and a mirror facing it. wherein, in the center of the mirror, a transparent glass window for directed light is provided, wherein the ellipsoidal glass substrate is coated with a 21-layer dielectric mirror consisting of high and low refractive index layers of ZnS / MgFg or TiO2 / SiO2; The optical thickness of 10 layers is λ / 4 / λ = 440 ± 10 nm /, the oxrtic thickness of 11-20 layers is λ 2 / λ / 2 = 610 ± 10 nm /, the optical thickness of layer 21/2 / 0 · Layers 1 and 21 are ZnS or TiOg. The floodlight according to claim 1, characterized in that it is? 400 = 10 nm,? = 570 + 10 nm. The reflector according to claim 1, characterized in that the window is coated with a 13-layer dialectric mirror consisting of 7 / ZnS / MgFg or TiOg / SiOg layers, wherein the optical thickness of the 1st and 13th layers is / ./8. . the intermediate layers' / 4 // = 1010 + 100 nm /, and the first and last layers are MgF _? or SiOg. The reflector according to claim 1, characterized in that the window is coated with an 11-layer dielectric mirror consisting of 7 / ZnS / MgFg or TiOg / SiOg layers, wherein the optical thicknesses of the 1st and 11th layers are // 8, the intermediate layers have λmax, λ = 600 + 10 nm, or λ = 400 + 10 nm, or> = 550 + 10 nm, the starting and finishing layers being MgFg or SiOg. A reflector according to any one of claims 1 to 3, characterized in that the spherical mirror has a transparent aperture / 7 / in each radiation region and is preceded by a scintillator having an interference layer perpendicular to the major axis *, which is a reflector of infrared radiation. shield mirror coated with a reference layer. 180 333 6. A reflector according to claim 1, characterized in that a small mirror (22 /) perpendicular to the major axis is located in the minor axis of the ellipsoid, with an aperture (7) in the center, which is not smaller in front. A 3 3 3 / vacy 4-point spectrum interference filter is provided.