DE102007030263A1 - Illuminable device - Google Patents

Abstract

An illuminable device comprising at least one light source, a lower, the light source associated, light-scattering cover of colored (DIN 5033, Part 1) plastic, which at the wavelength of the relative energy maximum of the light source, a transmission (DIN 5036) of at least 35% and a reflection (DIN 5036) of at least 15%, and a top cover made of a gray transparent colored plastic having a transmission of 5 to 20% at the wavelength of the relative energy maximum of the light source, and its use as a billboard is described.

Description

The The invention relates to an illuminable device and its use as an advertising or information board.

Illuminable devices, eg. B. for billboards, consisting essentially of a light source and a light source associated with the light-diffusing cover made of colored plastic, are known in principle (eg. JP 61159440 ). In general, incandescent or fluorescent tubes are used as light sources, which have a good luminosity and emit a wide spectrum of light. Due to the wide spectrum of light corresponding colored plastic covers appear in unlit condition, ie z. B. in daylight, in the same color impression, which can be perceived even with backlighting by means of said light sources.

LEDs (LEDs) are compared to light sources like incandescent or fluorescent tubes of significantly lower luminosity. However, colored LEDs are still very good in the dark perceptible, as they radiate an almost monochromatic light, this in turn in the respective wavelength range relative is intense. Corresponding colored light-emitting diodes are of several Manufacturers z. B. in the colors red, green, blue and yellow available.

Dyeing and Dyeing process for plastics such. B. polymethyl methacrylate are well known z. B. off EP-A-130 576 ,

US 5,355,284 describes a mirror assembly, in particular rearview mirrors for vehicles. The module may contain additional additional functions, eg. B. as a further brake light, turn signal and / or clock. For this purpose, a dichroic mirror is used, which reflects the visible light and transmits light in the range of 600 to 700 nm. For illumination, LEDs can also be used. In order to avoid dazzling the driver, the light is passed through a grid structure so that it emerges directional. The mirror cover is not color matched to the LEDs used and not light scattering, but transparent.

US 5,684,633 describes a polymeric body made of two polymeric materials of multilayer construction. It can z. B. more than 500 layers may be present. The polymeric bodies can be used for vehicle taillights and colored accordingly. The light sources are not further specified in this context. An adaptation of the colored cover to the spectrum of LEDs is not apparent.

In the EP-B-1456581 An illuminable device is described which consists essentially of a light source consisting of one or more light-emitting diodes (LEDs) emitting a colored, substantially monochromatic light and a light-scattering cover of colored plastic associated with the light source. The cover has a transmission at the wavelength of the relative energy maximum of the light emitting diode ( DIN 5036 ) of at least 35% and a reflection ( DIN 5036 ) of at least 15%. By the device is formed optically in about the same color impression in incident light, so z. B. in daylight, as well as fluoroscopy. Corresponding advertising or information boards appear optically approximately the same both during the daytime and in the backlit state (page 2, lines 34-50).

It However, there is a need for an illuminable device, for example, for light advertising, the daytime in supervision (not backlit) one for night effect (backlit) has different colors, for example during the day black and at night a colorful coloring, for example red. The device must be designed so that when possible supervision a black impression is given and still with backlighting still enough light passes through, for a good view and to get an unimpaired colorful hue.

there should the spectral transmission in the wavelength range from 400 to 700 nm as constant as possible. The deviation from the mean spectral value should be below 5% points be.

Farther the device should allow low depths and is characterized by a low power consumption task Therefore, to provide a device with the aforementioned property profile.

The Device according to the invention solves these Task.

The invention relates to an illuminable device comprising at least one light source, a lower, the light source associated, light-scattering cover of colorfully colored ( DIN 5033 , Part 1) plastic, which at the wavelength of the relative energy maximum of the light source, a transmission ( DIN 5036 ) of at least 35% and a reflection ( DIN 5036 ) of at least 15%, and a top cover of a gray transparent colored plastic having a transmission of 5 to 20% at the wavelength of the relative energy maximum of the light source.

It is preferred that the light source of the invention Device comprising one or more light-emitting diodes (LEDs) or fluorescent tubes which is a colored, essentially monochromatic light send out and show a particularly brilliant coloring. Very particularly preferred is the use of one or more or a variety of LEDs that are a colored, essentially send out monochromatic light. If necessary, you can Also LEDs of different colors can be used simultaneously.

The color of the LEDs depends on the wavelength of their relative energy maximum. This relative energy maximum can z. B. be determined spectrophotometrically and drawn in a wavelength spectrum. You can see the light source z. B. in an Ulbricht'sche ball (s. DIN 5036 ) and measure the exiting light. The highest point (peak) of the curve indicates the wavelength of the relative energy maximum. The number of LEDs depends on the size of the device, the luminosity of the LEDs used and the overall desired brightness of the device in the transilluminated state. LEDs are z. B are available as modules of 4 LEDs in a holder, of which, if necessary, a variety can be installed in the device.

suitable LEDs are z. B. red, blue, yellow or green LEDs. A red LED has a relative energy maximum in the range of about 610 up to 640 nm.

A blue LED has a relative energy maximum in the range of about 440 up to 500 nm.

A yellow LED has a relative energy maximum in the range of about 570 up to 610 nm.

A Green LED has a relative energy maximum in the range of about 500 to 540 nm.

at Combinations with several different colored parts z. Eg letters Alternatively, you can use the usual white ones Light sources, in particular z. B. fluorescent tubes or white LEDs are used.

Especially suitable for the lower plastic cover are on the monochromatic light of the LEDs used tuned colorful Colorations, as these are characterized by a high light transmission excel in good light scattering. In addition, can by such a colored lower cover the light diminishing effect of the top cover can be compensated.

The coloring of the device according to the invention, which appears black in supervision, is achieved by the neutral gray transparent coloring of the upper cover. In addition, the top cover used according to the invention has a transmission ( DIN 5036 ) of 5 to 20%, preferably 8 to 15%, at the wavelength of the relative energy maximum of the light source, so that when backlighting a good view is ensured and the hue of the deposited lower colored layer remains virtually unchanged.

A gray coloration that meets the above criteria, for example, by a mixture of soluble dyes, eg. B. from the series of Macrolex ^® - (Lanxess), Sandoplast ^® - (Clariant) or Thermoplast ^® (BASF) -Derreichen_erreichen. Also by certain pigments such as specific soot pigments or spinel pigments, for. B. Pigment Black 26, a coloring with the required properties is possible.

The The device according to the invention may optionally between the lower and the upper cover a third layer having a colorless plastic. to Increasing the light scattering can this third layer too Containing scattering particles in an amount of 0.1 to 10 wt .-%.

The lower and the upper cover and the intermediate layer are made of a plastic which is transparent in the non-colored state and without scattering agent, or a transmission ( DIN 5036 , s. Parts 1 and 3 / D65) of at least 50%, preferably at least 70, particularly preferably from 75 to 92%. With scattering agent (only lower cover and intermediate layer), but without colorant, the transmittance may preferably be at least 40%, more preferably at least 50%.

suitable Plastics are z. As polymethylmethacrylate plastic, impact resistant modified polymethyl methacrylate, polycarbonate plastic, polystyrene plastic, Styrene-acrylonitrile plastic, polyethylene terephthalate plastic, Glycol-modified polyethylene terephthalate plastic, polyvinyl chloride plastic, more transparent Polyolefin plastic, acrylonitrile-butadiene-styrene (ABS) plastic or mixtures (blends) of various thermoplastics.

Because of their high weather resistance are especially for Exterior applications Polymethyl methacrylate plastic cast or extruded polymethylmethacrylate, e.g. B. with a methyl methacrylate content from 85 to 100% by weight, preferred. If necessary, you can to 15 wt .-% of suitable comonomers such as. B. esters of methacrylic acid (eg, ethyl methacrylate, butyl methacrylate, hexyl methacrylate, cyclohexyl methacrylate), Esters of acrylic acid (eg, methyl acrylate, ethyl acrylate, Butyl acrylate, hexyl acrylate, cyclohexyl acrylate) or styrene and styrene derivatives, such as a-methylstyrene or p-methylstyrene polymerized with be contained or in the polymer.

The light scattering ability of the lower cover and the intermediate layer can be measured after DIN 5036 , preferably have a value of at least 0.5, more preferably of at least 0.6, in particular at least 0.7. The better the light scattering capability, the smaller the distance of the light source from the cover and the associated lower overall depths of the device can be realized.

When Light scattering agents are preferably used colorless scattering pigments, whose refractive index is up to about 0.5 from the refractive index of the plastic, in particular to about 0.2 differs from the refractive index of acrylic glass. Suitable examples are calcium carbonate, magnesium carbonate, aluminum trihydroxide, Magnesium hydroxide, barium sulfate, etc.

As well may be polymers in the appropriate refractive index range lie, are used. For example, in the methyl methacrylate monomer Polystyrene, which is then dissolved during the Polymerization precipitates and becomes a material with good Light scattering leads. But it can also be networked Polymer particles are added, for. B. polymer beads of crosslinked polystyrene or crosslinked copolymers of methyl methacrylate with phenyl (meth) acrylate or benzyl (meth) acrylate.

BaSO ₄ or polystyrene are preferred and are introduced in an amount of 0.5 to 5.0 wt .-%, preferably in an amount of 1.5 to 2.5 wt .-% in the plastic. Lichtstreuperlen of a crosslinked plastic are preferably introduced in an amount of 0.1 to 10 wt .-% in the plastic.

The lower light-scattering cover made of colorfully colored plastic has a transmission at the wavelength of the relative energy maximum of a light-emitting diode ( DIN 5036 , s. Parts 1 and 3) of at least 35%, preferably at least 38%, particularly preferably at least 41%, and a reflection ( DIN 5036 , Parts 1 and 3, reflection or remission) of at least 15%, preferably at least 20%, particularly preferably at least 30%.

The term "colorful color" is analogous DIN 5033-1 : 1979-03 (part 1, points 13 and 14).

The Transmission of a lower cover associated with a yellow LED may be at least 50%, preferably at least 60%. The corresponding Reflection can be at least 25%, preferably at least 30%.

Especially can the transmission of a, a red LED associated lower Cover at least 40%, preferably at least 45%, amount. The appropriate reflection can be at least 22%, preferably at least 45% lie.

Especially The transmission can be assigned to a green LED lower cover at least 40%, preferably at least 42%. The corresponding reflection can be at least 18%, preferably at least 20%, lie.

Especially can the transmission of a, a blue LED associated lower Cover at least 40%, preferably at least 42%. The corresponding reflection can be at least 20%, preferably at least 22%, lie.

In the event that LEDs of different colors are used at the same time to achieve mixed colors (eg yellow and green LEDs produce a yellow-green color impression), the assigned light scattering plastic cover at least at the wavelength of the relative energy maximum of one of the LEDs used, ie z. As the yellow or green LED, have the above required transmission and reflection values.

• Für gelbe Einfärbungen: Pyrazolon-Gelb oder Perinon Orange bzw. Mischungen daraus.
• Für rote Einfärbungen: Mischungen aus Pyrazolon-Gelb und Antrachinonrot, Naphtol AS oder DPP-Rot bzw. Mischungen daraus.
• Für grüne Einfärbungen: Mischungen aus Cu-Phtalocyanin-Grün und Pyrazolon-Gelb.
• Für blaue Einfärbungen: Anthrachinon-Blau oder Ultramarin-Blau bzw. Mischungen daraus.

Suitable colorants for the lower cover are preferably organic colorants for the purposes of the invention, since they have high brilliance and luminosity both in incident light and in transmitted light. Suitable colorants are, in particular, plastic-soluble dyes or organic pigments, but also, less preferably, insoluble inorganic color pigments. To name a few are exemplary:

• For yellow colorations: pyrazolone yellow or perinone orange or mixtures thereof.
• For red colorations: mixtures of pyrazolone yellow and anthraquinone red, naphtol AS or DPP red or mixtures thereof.
• For green colorations: mixtures of Cu phthalocyanine green and pyrazolone yellow.
• For blue colorations: anthraquinone blue or ultramarine blue or mixtures thereof.

The Production of the device according to the invention contained cover plates can in a conventional manner by Extrusion or injection molding done. The two-layer system will preferably prepared by co-extrusion. In the preparation of by injection molding, preferably the top cover and the colored colored bottom cover made separately.

According to one particular embodiment is made of the lower and the upper cover plate formed a chamber into which subsequently a liquid colorless plastic is poured, which then cures to form a third bonding layer.

spreading material and colorants may be added to the plastic during the Polymerization or during thermoplastic processing be added or incorporated in the melt state in a conventional manner. To the plastic against the influences of light and weather can still protect against sunscreens, UV absorbers, Antioxidants, etc. are added.

On this way can z. B. plastic plates with a thickness from Z. B. 0.5 to 10 mm, preferably 1 to 5 mm, are obtained as covers for inventive Illuminable devices with rectangular boxes, frames or bracket can be used. Corresponding pieces can also be made by cutting, milling, Sawing or other processing in virtually any Shapes are transferred and adapted. In addition to the Plate shape can also be any profiles, such as pipes, rods etc. are manufactured.

The Device according to the invention can in the case of Use of LEDs designed so that the spacing of the LEDs to the lower light scattering cover 3 to 12 cm, preferably 4 to 10 cm. At this distance will be a good one Illumination reached. If the distance is too short, the position will be the LED is visible in the form of a bright spot. Too big Distance decreases the brightness too much.

The LEDs can be z. In a box or frame, which is covered by the lower and the upper cover. The covers can with an information-bearing layer, for. B. a film, be provided or even have the form of information itself, z. B. in letter or number form.

The Device according to the invention is preferably used as a billboard or billboard.

Example:

Three layer device

Gray cover:

Version 1:

In 1000 parts of prepolymeric methylmethacrylate syrup (viscosity about 1000 cP), 1 part of 2,2'-azobis- (2,4-dimethylvaleronitrile) solved.

In this approach, one gives a color paste consisting of
3 parts of a soluble polymethyl methacrylate resin and
0.2 parts of Pigment Black 26, which in
30 parts of methyl methacrylate with a high-speed dispersant
(Rotor / stator principle) is dispersed, added.

Of the Batch is stirred vigorously, in one with a 3 mm thick String distanced silicate glass chamber filled and placed in a water bath polymerized at 45 ° C for about 16 hours. The final polymerization takes place in a tempering cabinet at 115 ° C for about 4 Hours.

you gets a plate with a neutral gray, transparent Appearance. The spectral transmission lies in the wavelength range from 400-700 nm at 10 to 15%. The transmittance is at 12%.

Variant 2:

In 1000 parts of prepolymeric methylmethacrylate syrup (viscosity about 1000 cP), 1 part of 2,2'-azobis- (2,4-dimethylvaleronitrile) solved.

In this approach, one gives a mixture
0.0060% Macrolex green G,
0.0040% Macrolex Violet B
0.0067% Plastred 8350 and
0.0028% thermoplastic yellow 104 added

Of the Batch is stirred vigorously, in one with a 3 mm thick String distanced silicate glass chamber filled and placed in a water bath polymerized at 45 ° C for about 16 hours. The final polymerization takes place in a tempering cabinet at 115 ° C for about 4 Hours. This gives a plate with a neutral gray, transparent appearance.

The Spectral transmission lies in the wavelength range of 400-700 nm at 7 17%. The transmittance is 12%.

• Angaben: in Gew.-%

Colored cover of one color of the colorant series 1:
Production analogous to gray cover,
but it will consist of a color paste
3 parts of a soluble polymethylmethacrylate resin,
20 parts of barium sulfate and the colorants of the respective color according to Table 1, which in
30 parts of methyl methacrylate with a high-speed dispersant
(Rotor / stator principle) is added. Tab. 1 Colorant Series 1: Red 1, Yellow 1, Blue 1 Green 1 colour Cu Phthalocyyaningrün pyrazolone anthraquinone Perinone anthraquinone Red 1 - 0.1500 - - 0.0200 Yellow 1 - 0.0825 - 0.0030 - Green 1 0.0200 0.0400 - - - Blue 1 - - 0.0100 - -

• Data: in% by weight

Inside:

Manufacture analogous to gray cover, but it is instead of the color paste, a paste consisting of
3 parts of a soluble polymethyl methacrylate resin and
10 parts of barium sulfate, which in
30 parts of methyl methacrylate with a high-speed dispersant
(Rotor / stator principle) is added.

Of the Batch is stirred vigorously, in one with a 3 mm thick String distanced chamber filled, which made the gray and one of the colored covers is formed, and in a water bath polymerized at 45 ° C for about 16 hours. The final polymerization takes place in a tempering cabinet at 115 ° C for about 4 Hours.

you receives a three-layer cover plate.

Results:

In a white lacquered, open top metal box of the dimensions 90 × 470 mm and 100 mm height are on the inner bottom 32 LEDs each, mounted by OSRAM (8 modules 4 LEDs). With a power supply is at an operating voltage of 10 V the permissible operating current of between 320-400 depending on the type mA adjusted.

One of the previously obtained three-layer cover plates is placed with the gray side up on this box and judged by color. The incident light test (daytime effect) is carried out by illumination with a daylight lamp with 150 W (D65 after DIN 6173 , Grade 1, z. From Siemens) at a distance of about 60 cm from above. The LEDs are switched off. The transmitted light test is carried out in a darkened room with activated LEDs according to the above operating information.

The Day effect is in the device according to the invention neutral black. If fluoroscopy (nighttime effect) is depending on the version a clear and brilliant coloring (red, yellow, green and blue after series 1).

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - JP 61159440 [0002]
• - EP 130576 A [0004]
• - US 5355284 [0005]
• US 5684633 [0006]
• EP 1456581 B [0007]

Cited non-patent literature

• - DIN 5036 [0007]
• - DIN 5036 [0007]
• - DIN 5033 [0012]
• - DIN 5036 [0012]
• - DIN 5036 [0012]
• - DIN 5036 [0014]
• - DIN 5036 [0021]
• - DIN 5036 [0024]
• - DIN 5036 [0027]
• - DIN 5036 [0031]
• - DIN 5036 [0031]
• - DIN 5033-1 [0032]
• - DIN 6173 [0059]

Claims (9)

Illuminable device containing at least a light source, a lower light associated with the light source diffusing cover made of colored colored (DIN 5033) plastic, which at the wavelength of the relative energy maximum the light source has a transmission (DIN 5036) of at least 35% and a reflection (DIN 5036) of at least 15%, and a top cover in a gray transparent colored Plastic, which at the wavelength of the relative energy maximum the light source has a transmission of 5 to 20%. Device according to claim 1, characterized in that that the light source consists of one or more light emitting diodes (LEDs) or fluorescent tubes, which is a colored, essentially send out monochromatic light. Device according to Claim 1 or 2, characterized that the transmission of the upper cover is 8 to 15%. Device according to one or more of the claims 1 to 3, characterized in that the upper and the lower cover are directly connected. Device according to one or more of the claims 1 to 3, characterized in that between the lower and the top cover is a third layer which has a contains colorless plastic. Device according to one or more of the claims 1 to 5, characterized in that the plastic polymethylmethacrylate is. Device according to claim 5, characterized in that that the third layer additionally light scattering agent in contains an amount of 0.1 to 10 wt .-%. Device according to one or more of the claims 1 to 7, characterized in that the light source in a Box or frame is located, that of the lower and the upper Cover is covered. Use of the device according to one or more of claims 1 to 8 as advertising or information board.