EP2459795B1 - Light emitting device for a drum of a household appliance - Google Patents
Light emitting device for a drum of a household appliance Download PDFInfo
- Publication number
- EP2459795B1 EP2459795B1 EP10742429.3A EP10742429A EP2459795B1 EP 2459795 B1 EP2459795 B1 EP 2459795B1 EP 10742429 A EP10742429 A EP 10742429A EP 2459795 B1 EP2459795 B1 EP 2459795B1
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- EP
- European Patent Office
- Prior art keywords
- light
- household appliance
- emitting device
- emitting diode
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/02—Fastening of light sources or lamp holders with provision for adjustment, e.g. for focusing
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/26—Casings; Tubs
- D06F37/266—Gaskets mounted between tub and casing around the loading opening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/02—Combinations of only two kinds of elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V31/00—Gas-tight or water-tight arrangements
- F21V31/005—Sealing arrangements therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
- F21V33/0004—Personal or domestic articles
- F21V33/0044—Household appliances, e.g. washing machines or vacuum cleaners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/008—Combination of two or more successive refractors along an optical axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/02—Refractors for light sources of prismatic shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
- F21V17/06—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages the fastening being onto or by the lampholder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
- F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
- F21V17/16—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by deformation of parts; Snap action mounting
- F21V17/164—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by deformation of parts; Snap action mounting the parts being subjected to bending, e.g. snap joints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
- F21W2131/30—Lighting for domestic or personal use
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Definitions
- the present invention relates to a light emitting device for illuminating the drum of a household appliance and a household appliance with such a light emitting device (see US-A-7 559 672 ).
- a light emitting device of the prior art comprises a housing with a light exit area and a remote and opposite mounting area.
- the light-emitting device is attached to the attachment area on a component of a household appliance.
- the cables for supplying power to a light emitting diode of the light emitting device in the vicinity of the fixing portion enter the light emitting device.
- the light-emitting diode is arranged in the vicinity of the light exit area.
- metal and / or plastic components are provided in the prior art, with which a light-emitting diode in the vicinity of the light emitting area can be arranged. These metal and / or plastic components support the LED relative to the mounting area. Since the light-emitting diode is typically arranged on a printed circuit board, a relatively large number of components are required in order to support the light-emitting diode with the printed circuit board with respect to the fastening region. The power supply can be done via suitably supplied cable or metal components. Moreover, such a light emitting device of the prior art relatively many assembly steps are required.
- US 7,559,672 B1 is a luminaire provided for shelf lighting known, which comprises an elongated support profile, on which a plurality of LEDs is mounted.
- the LEDs are arranged in one or two longitudinal rows one behind the other, each diode row is mounted on a circuit board attached to the support profile.
- a trained as a Fresnel lens profile strip is placed on the support section over the diode rows and ensures a broad and homogeneous light distribution.
- the object of the invention is achieved by a household appliance light emitting device according to claim 1.
- the household appliance light emitting device comprises a light emitting diode emitting a light beam having a cross section, a housing in which the light emitting diode is disposed, and a light deflecting device through which the light beam passes and deflecting the incoming light beam so that the light beam is asymmetrical to the optical axis of the household appliance light emitting device emerges from the light-directing device, wherein the light-directing device is formed integrally with the housing.
- the term light beam as used herein also includes a bundle of individual beams.
- the center of the light emitting area of the light emitting diode may be located in the optical axis of the household appliance light emitting device.
- the center of the light-deflecting device may be located in the optical axis of the household appliance light-emitting device.
- the deflected by the light deflecting light is emitted obliquely to the optical axis of the household appliance light emitting device.
- the household appliance light emitting device comprises an orientation feature, such as a Recess or a projection which is arranged in a fixed orientation to the light beam emitted asymmetrically to the optical axis on the housing.
- the light emitting device according to the invention can be used in particular for illuminating a drum of a household appliance, for example a washing machine or a tumble dryer mentioned in the introduction.
- a washing machine is usually arranged between a tub, in which the drum is located, and the housing, a seal.
- the seal seals the gap between the drum and the housing. This gap should be kept as low as possible for design reasons.
- the light-emitting device according to the invention is arranged in the seal in the gap between the housing and the drum parallel to the axis of rotation of the drum.
- the orientation feature on the light-emitting device ensures that the light-emitting device is arranged with such an orientation on the household appliance that the oblique light beam emitted by the light-emitting device at least largely strikes the drum.
- complementary orientation features can be provided on the household appliance. If a plurality of light emitting devices are to be arranged in the region of the opening of the drum about the axis of rotation of the drum, it is understood that the complementary orientation features each have an angle to ensure that the light beam emitted asymmetrically to the optical axis of the respective light emitting device into the drum.
- the gap and thus also the seal can be kept as small as possible. If a light emitting device, which emits a light beam parallel to its and / or along its optical axis, provided to illuminate a drum, the light emitting device must be oblique in Gap may be arranged to the tub, which requires a larger gap or reduces possible required tolerances.
- the maximum intensity of the light beam emitted by the light directing means is at an angle of from about 20 ° to about 70 °, preferably from about 30 ° to about 60 °, most preferably from about 35 ° to about 55 °, with respect to the optical axis of the light emitting device.
- the home appliance light emitting device may include a plurality of light emitting diodes whose light passes through the light directing device.
- the light directing device deflects substantially all the individual beams of the light beam of the light emitting diode in the same direction asymmetrically to the optical axis of the household appliance light emitting device. The light emitted from the light emitting diode thus emerges obliquely from the optical axis of the household appliance light emitting device.
- the light-directing device comprises at least one prism-like element, preferably a plurality of prism-like elements, in order to deflect the light beam of the light-emitting diode asymmetrically with respect to the optical axis of the light-emitting device.
- the light beam thus exits the light emitting device at an oblique angle to an axis perpendicular to the region of the housing from which the light beam exits the light emitting device and / or which is parallel to the longitudinal axis of the housing.
- the light emission plane of the light-emitting diode is preferably arranged parallel to the light-directing device.
- the at least one prism-like element can be arranged on the side of the light-directing device facing the light-emitting diode.
- a plurality of prism-like elements on the light-emitting diode side facing the light-guiding device is arranged. As a result, a particularly low height of the light-guiding device is achieved.
- the at least one prismatic element may be oriented asymmetrically with respect to the optical axis of the household appliance light emitting device.
- the at least one prism-like element can not be configured rotationally symmetrical with respect to the optical axis of the household appliance light emitting device.
- At least one linear prismatic element may be provided, the longitudinal axis of which extends in a plane perpendicular to the optical axis of the household appliance light emitting device.
- At least one prism-like element can be in the form of an arc segment and asymmetrical, in particular not rotationally symmetrical, be formed to the optical axis of the household appliance light emitting device.
- At least one light homogenizing means On the side of the light-directing device facing away from the light-emitting diode, at least one light homogenizing means, preferably at least one plurality of homogenizing means, can be arranged, which ensure that the beam emitted by the light-emitting device has a defined angular spectrum.
- the light emitting diode emits the light beam with a first angle spectrum.
- the household appliance light-emitting device comprises a light bundling device arranged spatially between the light-emitting diode and the light-directing device, which converts the light beam from the light-emitting diode into a light beam having a second angular spectrum, wherein the second angular spectrum is smaller than the first angular spectrum.
- the light beam propagates over a distance from the light bundling device to the light directing device.
- the light condensing means generates a convergent or divergent bundle of light rays.
- the light bundling device concentrates the rays emitted by a light-emitting diode into a bundle which has a substantially lower angular spectrum than the light emitted by the light-emitting diode.
- the light bundling device is preferably a light parallelizing device.
- the light beam with the second angular spectrum is preferably a substantially parallel light beam.
- the light beam having the second angular spectrum may have an aperture angle (ie, an angular deviation from parallelism) less than or equal to about ⁇ 10 °, about ⁇ 5 °, preferably less than or equal to ⁇ 2.5 °, more preferably about ⁇ 1 °, and most preferably less than or equal to about ⁇ 0.5 °.
- the intensity of the light beam can be 50% of the maximum intensity. This definition is typically used to determine the angular spectrum of a light emitting diode.
- the light concentrating device may have a diameter between about 10 mm and about 20 mm.
- the light-deflecting device may be spaced from the light-bundling device without substantial intensity losses occurring. Since the light beam with the second angular spectrum passes a distance between the light bundling device and the light-guiding device, no coupling-in and coupling-out losses occur, as occurs, for example, with optical fibers.
- the light-emitting diode and the light-bundling device can be arranged close to a fixing region of the light-emitting device which is opposite to the light-directing device.
- the light emerging from the light-emitting diode is converted by the light bundling device into a light beam with the second, smaller and preferably parallel angular spectrum, which extends over a distance to the relatively distant light-directing device, where it is converted into a light beam which is asymmetrical to the light-emitting device whose optical axis emerges.
- the cross-sectional area of the light beam having a second angular spectrum may be larger than the luminous area of the chip of the light-emitting diode.
- the light emitting diode comprises a lens, wherein the first angular spectrum of the light emerging from the light emitting diode has a range of about 20 ° to about 130 °, preferably about 50 ° to about 130 °, most preferably about 110 ° to about 130 °.
- the angle spectrum can be defined in such a way that the intensity of the light at the edge of the angular spectrum is about 50% of the maximum intensity, as is customary with light-emitting diodes.
- a large angular spectrum of the light beam emitted by the light-emitting diode permits greater assembly tolerances between the light-bundling device, the light-emitting diode, the chip in the light-emitting diode, the lens in the light-emitting diode, the solder connection between the light-emitting diode and the circuit board, and between the circuit board and the fastening region the quality of the light beam with the second, smaller and preferably parallel angle spectrum is excessively impaired.
- the light bundling device may be sealed relative to the housing.
- an O-ring between the housing and the Lichtbündelungs might be arranged.
- the light emitting device on a redundancy and can be classified in a higher protection class.
- this light emitting device allows easy wiring because the board is located near the mounting area from which power is supplied to the light emitting device.
- the light emitting diode is an SMD light emitting diode which is fixed on a circuit board by soldering. Since the light emitting device according to the invention is relatively tolerant of manufacturing tolerances, the positioning of the light emitting diode can be carried out by soldering. Furthermore, depending on the soldering technique, a centering of the SMD light emitting diode on the terminals of the board. SMD LEDs typically have a large angular spectrum, i. a large opening angle, between about 50 ° and about 120 °.
- the light bundling device will produce a divergent or convergent light beam having the second angular spectrum which is about ⁇ 15 °, preferably about ⁇ 10 °, more preferably about ⁇ 5 °, most preferably about ⁇ 1.5 °.
- the household appliance light emitting device may comprise a plurality of light emitting diodes, wherein the light condensing device converts the light of the plurality of light emitting diodes into a light beam having the second, smaller and preferably parallel angular spectrum. This results in a particularly bright and / or a redundant light emitting device for a household appliance.
- the light lobes of the light-emitting diodes preferably overlap when they impinge on the light-bundling device.
- the light bundling device may be a converging lens, in particular a Fresnel lens.
- the light bundling device may be a collimator.
- the distance between the light-bundling device and the light-directing device can be greater than or equal to approximately 5 mm, preferably greater than or equal to approximately 7.5 mm and most preferably greater than or equal to approximately 10 mm.
- the cross section of the light beam having the second, smaller and preferably parallel angular spectrum is about 3 to about 20 mm, preferably about 5 to about 15 mm, most preferably about 8 to about 12 mm.
- the angular spectrum of the light beam emerging from the light emitting device is about 20 ° to about 60 °, preferably about 30 ° to about 50 °, most preferably about 35 ° to about 50 °.
- the light bundling device and a circuit board, on which the light-emitting diode is arranged can be spatially fixed to one another. This reduces the tolerance chain described above for the light beam with the second, smaller and preferably parallel angle spectrum on the position tolerance of the chip of the light emitting diode, the lens of the light emitting diode, the light emitting diode to the board and the board for Lichtbündelungs observed.
- the light bundling device and the circuit board can be fastened together.
- the circuit board can have recesses into which projections of the light bundling device engage. The recesses may be located at the edge of the board or be formed as openings.
- the projections of the light bundling device may be arms. On the arms locking means may be formed.
- the circuit board can be arranged in the light bundling device.
- the light bundling device can be spatially fixed relative to a housing of the light-emitting diode, in particular in that the light-bundling device has a region which is complementary to the housing of the light-emitting diode and fixes the light bundling device spatially relative to the light-emitting diode.
- the light bundling device may have a housing which has a recess complementary to the housing of the LED at its region facing the printed circuit board.
- the housing of the light concentrator can be positioned over the housing of the LED, and the housing of the LED spatially fixes the housing of the light concentrator.
- the complementary region can rest against the entire housing of the light-emitting diode or it can rest only at four points or two corners on the housing of the light-emitting diode. As a result, the tolerances caused by the board can be eliminated.
- the board may be arranged on the housing of the household appliance light emitting device so that the position of the board in the optical axis direction of the household appliance light emitting device and / or perpendicular to the optical axis direction of the household appliance light emitting device is determined by the housing of the household appliance light emitting device.
- the position of the board and thus the position of the light emitting diode including the chip and the lens and the position of the light bundling device to the housing of the household appliance light emitting device can be relatively accurately determined. Since the light-deflecting device is integral is formed with the housing of the household appliance light-emitting device, the tolerances of the tolerance chain can be further reduced and there is a light output, which is subject to relatively low Exemplarstreusch.
- the housing of the household appliance light emitting device may have a first region with a first cross section and a second region with a second cross section, wherein the first region has a smaller cross section than the second region, a step-shaped transition between the first and second region is present, the circuit board and the light condensing device is set from the second region perpendicular to the optical axis of the household appliance light emitting device and the stepped transition determines the board and the light condensing device in the direction of the optical axis. Since the light-directing device is formed integrally with the housing of the household appliance light-emitting device, this embodiment is particularly suitable for a casting process.
- the board may be arranged on a lid.
- the lid may be fixed, for example by means of a snap-in technique, on the housing opposite to the light-directing device.
- the lens may be disposed on the board as previously described.
- size deviations of the board which may be, for example ⁇ 0.15 mm, can be compensated because the board is not applied to the housing. The size tolerance of the board can thus not lead to a jamming of the board in the housing, not to a deformation of the housing and not to a game of the board in the housing.
- the invention further provides a household appliance according to claim 13.
- a sealing arrangement contained in the household appliance comprises an elastic seal with at least one receptacle and a household appliance light emitting device according to the invention.
- the household appliance sealing arrangement can be arranged in the tub of a washing machine and seal the drum with respect to the housing.
- the receptacle accommodates a region of the housing of the household appliance light-emitting device opposite to the light-emitting diode.
- the receptacle may be a recess in the seal.
- the light-emitting diode of the opposite region of the housing is advantageously formed with a round cross-section in order to effect the best possible sealing effect in interaction with the preferably elastic seal.
- the sealing arrangement has the advantage that the waste heat the LED is not or only partially guided into the seal, which increases the life of the seal. Due to the thermal load due to the waste heat of the LED, the life of the seal can be shortened. Further, the circuit board can be made in any shape, such as rectangular, and does not necessarily have to be round, which would be the case if the light emitting diode was arranged at the light exit opening.
- the recess in the seal may be formed as an opening or as a blind hole, which receives the light-emitting diode of the opposite region of the housing of the household appliance light emitting device.
- the seal should be formed in this case, at least in the region of the receptacle or the blind hole of a semi-transparent or transparent material.
- the seal may not be transparent in a region remote from the receptacle or the blind hole.
- the household appliance is a washing machine or a tumble dryer.
- the seal assembly may be disposed on a drum of the household appliance.
- the drum can be well illuminated and on the other hand, the gap between the drum and the housing can be kept low.
- the household appliance light emitting device 50 described below may be used to illuminate the drum or other rotating components of a household appliance such as a washing machine or a tumble dryer.
- the light emitting device 50 has a housing 2, in which a circuit board 12 is arranged with a light emitting diode 10.
- the light emitting device 50 is closed with a lid 30.
- the light emitting device 50 can be fixed by means of the housing 2 or the lid 30 to a household appliance, that is spatially determined to be.
- a chip (not shown) of the light emitting diode 10 emits light which is brought by a lens 16 of the light emitting diode 10 in a predetermined angular spectrum, for example about 120 °.
- the angle spectrum of the light-emitting diode can be defined such that the intensity at the edge of the angle spectrum is 50% of the maximum intensity.
- the condenser lens 6 operates as a light bundling device or light parallelizing device.
- the converging lens 6 produces substantially parallel light beams 8.
- the intensity spectrum of the substantially parallel light beam may also be defined so that the intensity at the edge of the angular spectrum is 50% of the maximum intensity.
- This substantially parallel light beam 8 passes through the hollow housing 2.
- the substantially parallel light beam 8 impinges on a light-directing device 4.
- the essentially parallel light beam 8 extends over a distance S which is approximately as long as the diameter of the beam in this region or longer.
- substantially parallel light beam 8 may include a light beam that, for example, due to manufacturing and / or assembly tolerances, even slightly converged or diverged, for example, converges or diverges by about ⁇ 10 °.
- the opening angle of the light beam 22 emerging from a light-deflecting device 4 may be, for example, about 20 ° to about 60 °, the light-deflecting device 4 deflecting the beam 22 asymmetrically with respect to the optical axis 1 of the light-emitting device 50.
- the tolerances are relatively high in such a low-cost mass-produced article.
- the expression asymmetrical to the optical axis is to be understood such that the intensity maximum of the light beam emerging from the light-directing device is asymmetrical to the optical axis of the light-emitting device.
- a transparent cylinder or another light-conducting element may be arranged.
- the light-deflecting device 4 has a plurality of prism-like elements 20 on its side facing the light-emitting diode.
- a prism-like element By means of a prism-like element, a light beam impinging thereon is refracted to the perpendicular of the surface on which the light beam impinges. Since the surfaces of the prism-like elements 20, incident on the light rays, approximately the same angle to the optical axis 1 of the light emitting device, all the rays are deflected in substantially the same direction, if they impinge on the prismatic element with the same angle. Since a plurality of prism-like elements is provided, the light-directing device can be formed with a relatively small thickness. It is also possible to provide a smaller number of prism-like elements or else only one prism-like element, but this increases the thickness of the light-directing device 4.
- the prism-like elements 20 are formed in the illustrated embodiment is not rotationally symmetrical but linear.
- the FIG. 1 Consequently, a section through a plurality of linearly formed prism-like elements 20 of a light guide 4 is shown.
- These linear prismatic elements 20 extend, for example, perpendicular to the cutting plane through the light emitting device.
- the prism-like elements are preferably line prisms.
- the linear prismatic elements 20 are located in a plane that is perpendicular to the optical axis 1 of the light emitting device 50.
- the intensity maximum of the light beam 22 emitted by the light directing means 4 has an angle of about 20 ° to about 70 °, preferably about 30 ° to about 60 °, most preferably about 35 ° to about 55 °, with respect to the optical axis 1 of the light emitting device on.
- the rays 8 and 22 shown in the figure represent only exemplary rays and are not to be understood as edge value rays or as rays whose intensity is half the magnitude of the intensity maximum.
- a plurality of homogenizing means 34, 36 are arranged on the side facing away from the light emitting diode 10 of the light guide 4 .
- the homogenizing means 34, 36 may be designed as collecting lenses and / or scattering lenses.
- the homogenizing means 34, 36 cause the light beam emitted by the light-emitting device to have a defined angular spectrum.
- the first type of homogenizing agent 34 has a first radius and the second type of homogenizing agent 36 has a second radius that is different from the first radius.
- the first type of homogenizer 34 has a radius of about 0.8 mm to about 1.2 mm
- the second type of homogenizer 36 has a second radius of 0.15 mm to about 0.25 mm.
- the homogenizing means 34 of the first type and the homogenizing means 36 of the second type may be arranged alternately to each other.
- the opening angle of the light beam emerging from the homogenizing agent may be about 20 ° to about 60 °, preferably about 30 ° to about 50 °, most preferably 35 ° to about 50 °.
- the light directing device 4 may have a diameter of about 10 mm to about 20 mm.
- the converging lens 6 is secured to the board 12 by means of arms 24 with optional locking lugs (not shown).
- the board 12 may have openings 34 (see FIG. 2 ), through which the arms 24 extend.
- the circuit board 12 has an outer diameter corresponding to the inner diameter of the housing 2 of the light emitting device, so that the housing 2, the board 12 also defines in its position perpendicular to the optical axis of the light emitting device.
- FIG. 2 shows a plan view of the board 12.
- the light-emitting diode 10 is arranged on the board 12.
- the board 12 has openings 34 through which an arm 24 can pass.
- the converging lens 6 is thus aligned relatively accurately with the board 12.
- the light-emitting diode 10 if an SMD LED is used, centered on the designated pads (pad). This results in a cost-effective manner, a relatively accurate alignment of the optical axis of the light emitting diode with the optical axis of the converging lens 6. This increases the quality of the light output of the household appliance light emitting device.
- FIG. 3 shows a broken section in the direction of the optical axis of the light emitting device through a part of the housing 2 and the circuit board 12 of the light emitting device.
- the housing of the light emitting device has a first region 2a and a second region 2b.
- the first region 2a has a smaller cross section than the second region 2b.
- the cross section (perpendicular to the optical axis of the light emitting device) of the housing has a circular, elliptical, rectangular, polygonal shape.
- the transition between the first region 2 a and the second region 2 b of the housing 2 is step-shaped.
- the stepped transition determines the position of the board 12 in the direction of the optical axis of the light emitting device.
- the inner diameter of the second region 2b defines the position of the circuit board 12 perpendicular to the optical axis of the light emitting device.
- the light guide 4 is formed integrally with the first area 2a. Consequently, the housing 2 with the two areas 2a and 2b has no undercuts, so that it can be produced by a casting technique, for example by injection molding.
- the inner diameter of the second region 2b allows a relatively accurate alignment of the circuit board 12 and thus the optical axis of the light-emitting diode 10 and the condenser lens 6, as previously with reference to FIG FIGS. 1 and 2 has been described.
- the tolerance chain which results from the addition of the production and / or position tolerances of the light-directing device 4, the housing 2, the circuit board 12, the LED 10 including the chip and lens 16 to the circuit board and the converging lens 6 to the circuit board, can be reduced.
- the condenser lens 6 may be sealed relative to the housing 2.
- an O-ring (not shown) between the housing 2 and the converging lens 6 may be arranged.
- the circuit board 12 is pressed by means of a pressing element (not shown) against the stepped portion of the housing 2 of the light emitting device.
- the pressing member is integrally formed with the lid 30.
- the lid 30 can by means of a latching lug (not shown) engage the housing 2.
- the board may be located on the lid.
- the lid may be fastened to the housing, for example by means of a snap-in technique.
- the lens may be disposed on the board as previously described.
- size deviations of the board which may be, for example ⁇ 0.15 mm, can be compensated because the board is not applied to the housing.
- the size tolerance of the board can thus not lead to a jamming of the board in the housing, not to a deformation of the housing and not to a game of the board in the housing.
- This embodiment has a simpler structure and can be easily mounted. In this embodiment, the wiring is easier to implement.
- the light-emitting device according to the invention has the advantage that it can be produced from a few parts, which can be produced inexpensively in a casting process. Furthermore, the light emitting device according to the invention is constructed so that the effects of manufacturing tolerances are minimized. Since the light-emitting diode 10 emits a light beam 18 with a relatively large aperture angle from the lens 16, the positional tolerance of the light emitting diode on the circuit board 12 and the positional tolerance of the circuit board 12 with respect to the housing 2 have only a relatively small effect on the quality of the light emitted by the light emitting device light beam.
- the term position tolerance here also applies to a tilting of the light emitting diode 10, the board, the chip of the light emitting diode and / or the lens 16 of the light emitting diode. Due to the large opening angle of the emerging from the light emitting diode 10 light beam 18, the light emitting device is tolerant to tilting tolerances. Even with a tilting and / or displacement of the light-emitting diode 10, the circuit board 12 of the chip and / or the lens 16 of the light emitting diode, a sufficiently broad substantially parallel light beam is produced which impinges on the light directing device 4.
- the condenser lens 6 does not necessarily have to generate a substantially parallel light beam.
- the light beam generated by the condenser lens 6 may converge or diverge.
- the light beam 22 generated by the light-directing device 4 can optionally have a significantly greater divergence than the light beam 8 entering the light-directing device 4.
- Fig. 4 shows a home appliance seal assembly with a seal 70 and a household appliance light emitting device 50 which is arranged in a recess formed as a receptacle of the seal 70.
- the recess in the seal 70 receives the light emitting diode 10 opposite portion of the housing 2 of the household appliance light emitting device 50.
- the recess of the seal 70 thus accommodates the region of the housing 2 of the light-emitting device 50, in which the light-directing device 4 is located. Since the light-emitting diode 10 of the light-emitting device 50 is relatively far away from the seal 70, no or only relatively little heat generated by the light-emitting diode 10 is conducted into the seal 70. This can increase the life of the seal.
- the housing 2 of the light-emitting device 50 may have at least one pointed sealing element 54 projecting away from the housing 2, which on the one hand fixes the light-emitting device 50 in its position relative to the seal and prevents a liquid from passing through the seal 70 in the region of the recess.
- optional fasteners 60 are provided which fix the light emitting device 50 in position relative to a household appliance and / or dissipate heat generated by the LED.
- the light emitting device is powered by a cable 52 with power.
- Household appliance seal arrangement shown has a recess in the form of an opening in the seal 70.
- the recess may also be formed as a blind hole, in which the light-emitting device 50 is arranged.
- the entire seal 70 may be transparent or only the region of the recess and optionally its surroundings may be made transparent.
- the term "receptacle” includes not only an opening or a blind hole in the seal 70. It is also possible to maintain the thickness of the seal 70 substantially constant and provide a receptacle on one side of the seal 70 which receives the light emitting diode 10 opposite portion of the housing 2 of the household appliance light emitting device 50. This receptacle may for example have a U-shaped cross-section. Also in this case, the seal must be formed semitransparent or transparent in the area of the recording, whereas it may not be transparent in an area remote from the recording.
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Description
Die vorliegende Erfindung betrifft eine Lichtabgabeeinrichtung zum Beleuchten der Trommel eines Haushaltsgeräts sowie ein Haushaltsgerät mit einer solchen Lichtabgabeeinrichtung (siehe
Im Stand der Technik sind Kombinationen aus Leuchtdioden mit einem relativ kleinen Öffnungswinkel, d.h. etwa 3 bis 10°, und einem Diffusor bekannt. Eine solche Kombination hat den Nachteil, dass das Intensitätsmaximum der Lichtabgabe einer relativ großen Streuung unterliegt. D.h., das Maximum der Lichtabgabe einer Leuchtdiode kann eine relative große Abweichung von der mechanischen Achse der Leuchtdiode aufweisen. Dies führt zu einer ungleichmäßigen Ausleuchtung des Diffusors, was zu einer ungleichmäßigen Lichtabgabe der Kombination aus Diffusor und Leuchtdiode führt. Da die Lichtabgabe der Leuchtdiode nur in einem relativ engen Winkelbereich erfolgt, wirken sich Montagetoleranzen der Leuchtdiode stark auf die Position und die Intensität des auf den Diffusor auftreffenden Lichts auf. Das bedeutet, dass bereits eine relativ geringe Fehlorientierung der Leuchtdiode ausreicht, damit der Diffusor ungleichmäßig von der Leuchtdiode beleuchtet wird und die Lichtabgabe vom Diffusor ungleichmäßig erfolgt.In the prior art combinations of light emitting diodes with a relatively small opening angle, ie about 3 to 10 °, and a diffuser are known. Such a combination has the disadvantage that the intensity maximum of the light output is subject to a relatively large scatter. That is, the maximum of the light output of a light emitting diode may have a relatively large deviation from the mechanical axis of the light emitting diode. This leads to uneven illumination of the diffuser, resulting in uneven light output of the combination of diffuser and light emitting diode. Since the light emission of the light-emitting diode takes place only in a relatively narrow angular range, assembly tolerances of the light-emitting diode have a strong effect on the position and the intensity of the light striking the diffuser. This means that even a relatively small misorientation of the LED is sufficient so that the diffuser is unevenly illuminated by the LED and the light output from the diffuser is uneven.
Eine weitere Problemstellung ergibt sich, falls die Trommel eines Haushaltsgerätes, beispielsweise einer Waschmaschine oder eines Wäschetrockners, ausgeleuchtet werden soll, da innerhalb der Trommel oder vor der Trommel keine Leuchtmittel angeordnet werden können, da eine Stromzufuhr zu einem an einer rotierenden Trommel angeordneten Leuchtmittel nur mit erheblichem Aufwand realisierbar ist und vor der Trommel angeordnete Leuchtmittel die Sicht in die Trommel beeinträchtigen würden.Another problem arises if the drum of a household appliance, such as a washing machine or a tumble dryer to be illuminated, as inside the drum or in front of the drum no bulbs can be arranged, as a power supply to a arranged on a rotating drum bulbs only with Considerable effort is feasible and arranged in front of the drum bulbs would affect the view into the drum.
Aus
Es ist eine Aufgabe der Erfindung, eine verbesserte Lichtabgabeeinrichtung zum Ausleuchten einer Trommel eines Haushaltsgerätes zu schaffen.It is an object of the invention to provide an improved light emitting device for illuminating a drum of a household appliance.
Die Aufgabe der Erfindung wird gelöst durch eine Haushaltsgerätlichtabgabeeinrichtung gemäß Anspruch 1. Bevorzugte Weiterbildungen sind in den abhängigen Ansprüchen angegeben. Die Haushaltsgerätlichtabgabeeinrichtung umfasst eine Leuchtdiode, die einen Lichtstrahl mit einem Querschnitt abgibt, ein Gehäuse, in dem die Leuchtdiode angeordnet ist, und eine Lichtlenkeinrichtung, durch die der Lichtstrahl verläuft und die den eintretenden Lichtstrahl so ablenkt, dass der Lichtstrahl asymmetrisch zur optischen Achse der Haushaltsgerätlichtabgabeeinrichtung aus der Lichtlenkeinrichtung austritt, wobei die Lichtlenkeinrichtung integral mit dem Gehäuse ausgebildet ist.The object of the invention is achieved by a household appliance light emitting device according to
Der Ausdruck Lichtstrahl, wie er hierin verwendet wird, umfasst auch ein Bündel einzelner Strahlen. Der Mittelpunkt des Lichtabgabebereichs der Leuchtdiode kann sich in der optischen Achse der Haushaltsgerätlichtabgabeeinrichtung befinden. Ferner kann sich der Mittelpunkt der Lichtlenkeinrichtung in der optischen Achse der Haushaltsgerätlichtabgabeeinrichtung befinden. Vorzugsweise wird das von der Lichtlenkeinrichtung abgelenkte Licht schräg zur optischen Achse der Haushaltsgerätlichtabgabeeinrichtung abgegeben. Vorzugsweise umfasst die Haushaltsgerätlichtabgabeeinrichtung ein Orientierungsmerkmal, beispielsweise eine Ausnehmung oder einen Vorsprung, das in einer festgelegten Orientierung zu dem asymmetrisch zur optischen Achse abgegebenen Lichtstrahl am Gehäuse angeordnet ist.The term light beam as used herein also includes a bundle of individual beams. The center of the light emitting area of the light emitting diode may be located in the optical axis of the household appliance light emitting device. Furthermore, the center of the light-deflecting device may be located in the optical axis of the household appliance light-emitting device. Preferably, the deflected by the light deflecting light is emitted obliquely to the optical axis of the household appliance light emitting device. Preferably, the household appliance light emitting device comprises an orientation feature, such as a Recess or a projection which is arranged in a fixed orientation to the light beam emitted asymmetrically to the optical axis on the housing.
Durch die Abgabe eines Lichtstrahls asymmetrisch zur optischen Achse der Lichtabgabeeinrichtung werden neue Konstruktionstechniken auf dem Gebiet der Haushaltsgeräte ermöglicht. Die erfindungsgemäße Lichtabgabeeinrichtung kann insbesondere zum Ausleuchten einer Trommel eines Haushaltsgerätes verwendet werden, beispielsweise einer eingangs erwähnten Waschmaschine oder eines Wäschetrockners. Bei einer Waschmaschine ist üblicherweise zwischen einem Bottich, in dem sich die Trommel befindet, und dem Gehäuse eine Dichtung angeordnet. Die Dichtung dichtet den Spalt zwischen der Trommel und dem Gehäuse ab. Dieser Spalt soll aus konstruktiven Gründen möglichst gering gehalten werden. Die erfindungsgemäße Lichtabgabeeinrichtung ist in der Dichtung im Spalt zwischen dem Gehäuse und der Trommel parallel zur Drehachse der Trommel angeordnet. Durch die schräge Lichtabgabe der Lichtabgabeeinrichtung, d.h. asymmetrisch zur optischen Achse der Lichtabgabeeinrichtung, wird gewährleistet, dass die Trommel ausgeleuchtet werden kann. Durch das Orientierungsmerkmal an der Lichtabgabeeinrichtung wird gewährleistet, dass die Lichtabgabeeinrichtung mit einer solchen Orientierung am Haushaltsgerät angeordnet ist, dass der von der Lichtabgabeeinrichtung emittierte schräge Lichtstrahl zumindest größtenteils in die Trommel trifft. Hierzu können am Haushaltsgerät komplementäre Orientierungsmerkmale vorgesehen sein. Falls eine Mehrzahl von Lichtabgabeeinrichtungen im Bereich der Öffnung der Trommel um die Drehachse der Trommel angeordnet werden sollen, versteht es sich, dass sich die komplementären Orientierungsmerkmale jeweils einen solchen Winkel aufweisen, dass sichergestellt ist, dass der asymmetrisch zur optischen Achse der jeweiligen Lichtabgabeeinrichtung abgegebene Lichtstrahl in die Trommel trifft.By emitting a light beam asymmetric to the optical axis of the light emitting device new design techniques in the field of home appliances are possible. The light emitting device according to the invention can be used in particular for illuminating a drum of a household appliance, for example a washing machine or a tumble dryer mentioned in the introduction. In a washing machine is usually arranged between a tub, in which the drum is located, and the housing, a seal. The seal seals the gap between the drum and the housing. This gap should be kept as low as possible for design reasons. The light-emitting device according to the invention is arranged in the seal in the gap between the housing and the drum parallel to the axis of rotation of the drum. By the oblique light output of the light emitting device, i. asymmetrical to the optical axis of the light emitting device, it is ensured that the drum can be illuminated. The orientation feature on the light-emitting device ensures that the light-emitting device is arranged with such an orientation on the household appliance that the oblique light beam emitted by the light-emitting device at least largely strikes the drum. For this purpose, complementary orientation features can be provided on the household appliance. If a plurality of light emitting devices are to be arranged in the region of the opening of the drum about the axis of rotation of the drum, it is understood that the complementary orientation features each have an angle to ensure that the light beam emitted asymmetrically to the optical axis of the respective light emitting device into the drum.
Da sich die axiale Richtung und/oder die optische Achse der Lichtabgabeeinrichtung parallel zur Drehachse der Trommel befinden, können der Spalt und somit auch die Dichtung möglichst klein gehalten werden. Wird eine Lichtabgabeeinrichtung, die einen Lichtstrahl parallel zu ihrer und/oder entlang ihrer optischen Achse abgibt, zur Beleuchtung einer Trommel vorgesehen, muss die Lichtabgabeeinrichtung schräg im Spalt zum Bottich angeordnet sein, was einen größeren Spalt erfordert oder mögliche erforderliche Toleranzen verringert.Since the axial direction and / or the optical axis of the light emitting device are parallel to the axis of rotation of the drum, the gap and thus also the seal can be kept as small as possible. If a light emitting device, which emits a light beam parallel to its and / or along its optical axis, provided to illuminate a drum, the light emitting device must be oblique in Gap may be arranged to the tub, which requires a larger gap or reduces possible required tolerances.
Das Intensitätsmaximum des von der Lichtlenkeinrichtung abgegebenen Lichtstrahls weist einen Winkel von etwa 20° bis etwa 70°, vorzugsweise von etwa 30° bis etwa 60°, höchstvorzugsweise von etwa 35° bis etwa 55°, bezogen auf die optische Achse der Lichtabgabeeinrichtung auf.The maximum intensity of the light beam emitted by the light directing means is at an angle of from about 20 ° to about 70 °, preferably from about 30 ° to about 60 °, most preferably from about 35 ° to about 55 °, with respect to the optical axis of the light emitting device.
Die Haushaltsgerätlichtabgabeeinrichtung kann eine Mehrzahl von Leuchtdioden aufweisen, deren Licht durch die Lichtlenkeinrichtung verläuft. Die Lichtlenkeinrichtung lenkt im wesentlichen alle Einzelstrahlen des Lichtstrahls der Leuchtdiode in die gleiche Richtung asymmetrisch zur optischen Achse der Haushaltsgerätlichtabgabeeinrichtung ab. Das von der Leuchtdiode abgegebene Licht tritt folglich schräg zur optischen Achse der Haushaltsgerätlichtabgabeeinrichtung aus dieser aus.The home appliance light emitting device may include a plurality of light emitting diodes whose light passes through the light directing device. The light directing device deflects substantially all the individual beams of the light beam of the light emitting diode in the same direction asymmetrically to the optical axis of the household appliance light emitting device. The light emitted from the light emitting diode thus emerges obliquely from the optical axis of the household appliance light emitting device.
Die Lichtlenkeinrichtung umfasst zumindest ein prismenartiges Element, vorzugsweise eine Mehrzahl prismenartiger Elemente, um den Lichtstrahl der Leuchtdiode asymmetrisch zur optischen Achse der Lichtgabeeinrichtung abzulenken. Der Lichtstrahl tritt somit in einem schrägen Winkel zu einer Achse aus der Lichtabgabeeinrichtung aus, die senkrecht zu dem Bereich des Gehäuses steht, aus dem der Lichtstrahl aus der Lichtabgabeeinrichtung austritt und/oder die sich parallel zur Längsachse des Gehäuses befindet. Vorzugsweise ist die Lichtabgabeebene der Leuchtdiode parallel zur Lichtlenkeinrichtung angeordnet.The light-directing device comprises at least one prism-like element, preferably a plurality of prism-like elements, in order to deflect the light beam of the light-emitting diode asymmetrically with respect to the optical axis of the light-emitting device. The light beam thus exits the light emitting device at an oblique angle to an axis perpendicular to the region of the housing from which the light beam exits the light emitting device and / or which is parallel to the longitudinal axis of the housing. The light emission plane of the light-emitting diode is preferably arranged parallel to the light-directing device.
Das zumindest eine prismenartige Element kann an der der Leuchtdiode zugewandten Seite der Lichtlenkeinrichtung angeordnet sein. Vorzugsweise ist eine Mehrzahl prismenartiger Elemente an der der Leuchtdiode zugewandten Seite der Lichtlenkeinrichtung angeordnet. Dadurch wird eine besonders niedrige Höhe der Lichtlenkeinrichtung erreicht.The at least one prism-like element can be arranged on the side of the light-directing device facing the light-emitting diode. Preferably, a plurality of prism-like elements on the light-emitting diode side facing the light-guiding device is arranged. As a result, a particularly low height of the light-guiding device is achieved.
Das zumindest eine prismenartige Element kann asymmetrisch zur optischen Achse der Haushaltsgerätlichtabgabeeinrichtung ausgerichtet sein. Insbesondere kann das zumindest eine prismenartige Element nicht rotationssymmetrisch zur optischen Achse der Haushaltsgerätlichtabgabeeinrichtung ausgebildet sein. Es kann zumindest ein lineares prismenartiges Element vorgesehen sein, dessen Längsachse sich in einer Ebene senkrecht zur optischen Achse der Haushaltsgerätlichtabgabeeinrichtung erstreckt. Zumindest ein prismenartiges Element kann in Form eines Bogensegments und asymmetrisch, insbesondere nicht rotationssymmetrisch, zur optischen Achse der Haushaltsgerätlichtabgabeeinrichtung ausgebildet sein.The at least one prismatic element may be oriented asymmetrically with respect to the optical axis of the household appliance light emitting device. In particular, the at least one prism-like element can not be configured rotationally symmetrical with respect to the optical axis of the household appliance light emitting device. At least one linear prismatic element may be provided, the longitudinal axis of which extends in a plane perpendicular to the optical axis of the household appliance light emitting device. At least one prism-like element can be in the form of an arc segment and asymmetrical, in particular not rotationally symmetrical, be formed to the optical axis of the household appliance light emitting device.
An der der Leuchtdiode abgewandten Seite der Lichtlenkeinrichtung kann zumindest ein Lichthomogenisierungsmittel, vorzugsweise zumindest eine Mehrzahl von Homogenisierungsmitteln, angeordnet sein, die gewährleisten, dass der von der Lichtabgabeeinrichtung abgegebene Strahl ein definiertes Winkelspektrum aufweist.On the side of the light-directing device facing away from the light-emitting diode, at least one light homogenizing means, preferably at least one plurality of homogenizing means, can be arranged, which ensure that the beam emitted by the light-emitting device has a defined angular spectrum.
Die Leuchtdiode gibt den Lichtstrahl mit einem ersten Winkelspektrum ab. Die Haushaltsgerätlichtabgabeeinrichtung umfasst eine räumlich zwischen der Leuchtdiode und der Lichtlenkeinrichtung angeordnete Lichtbündelungseinrichtung, die den Lichtstrahl von der Leuchtdiode in einen Lichtstrahl mit einem zweiten Winkelspektrum wandelt, wobei das zweite Winkelspektrum kleiner als das erste Winkelspektrum ist. Der Lichtstrahl breitet sich über eine Strecke von der Lichtbündelungseinrichtung zur Lichtlenkeinrichtung aus.The light emitting diode emits the light beam with a first angle spectrum. The household appliance light-emitting device comprises a light bundling device arranged spatially between the light-emitting diode and the light-directing device, which converts the light beam from the light-emitting diode into a light beam having a second angular spectrum, wherein the second angular spectrum is smaller than the first angular spectrum. The light beam propagates over a distance from the light bundling device to the light directing device.
Es ist möglich, dass die Lichtbündelungseinrichtung ein konvergentes oder divergentes Bündel von Lichtstrahlen erzeugt. Die Lichtbündelungseinrichtung bündelt die von einer Leuchtdiode abgegebenen Strahlen in ein Bündel, das ein wesentlich niedrigeres Winkelspektrum als das von der Leuchtdiode abgegebene Licht aufweist.It is possible that the light condensing means generates a convergent or divergent bundle of light rays. The light bundling device concentrates the rays emitted by a light-emitting diode into a bundle which has a substantially lower angular spectrum than the light emitted by the light-emitting diode.
Die Lichtbündelungseinrichtung ist vorzugsweise eine Lichtparallelisierungseinrichtung. Der Lichtstrahl mit dem zweiten Winkelspektrum ist vorzugsweise ein im Wesentlichen paralleler Lichtstrahl. Der Lichtstrahl mit dem zweiten Winkelspektrum kann einen Öffnungswinkel (d.h. eine Winkelabweichung von der Parallelität) kleiner gleich etwa ±10°, etwa ±5°, vorzugsweise von etwa kleiner gleich ±2,5°, vorzugsweise von etwa ±1° und höchst vorzugsweise von kleiner gleich etwa ±0,5° haben. Am Rand des Winkelspektrums kann die Intensität des Lichtstrahls 50% der Maximalintensität betragen. Diese Definition wird typischerweise zum Bestimmen des Winkelspektrums einer Leuchtdiode verwendet. Wird für die Bestimmung des Winkelspektrums der Leuchtdiode eine andere Definition verwendet, ändern sich folglich auch die Intensitäten am Rand des jeweiligen Winkelspektrums. Die Lichtbündelungseinrichtung kann einen Durchmesser zwischen etwa 10 mm und etwa 20 mm aufweisen.The light bundling device is preferably a light parallelizing device. The light beam with the second angular spectrum is preferably a substantially parallel light beam. The light beam having the second angular spectrum may have an aperture angle (ie, an angular deviation from parallelism) less than or equal to about ± 10 °, about ± 5 °, preferably less than or equal to ± 2.5 °, more preferably about ± 1 °, and most preferably less than or equal to about ± 0.5 °. At the edge of the angle spectrum, the intensity of the light beam can be 50% of the maximum intensity. This definition is typically used to determine the angular spectrum of a light emitting diode. If a different definition is used for the determination of the angle spectrum of the light-emitting diode, the intensities at the edge of the respective angular spectrum likewise change accordingly. The light concentrating device may have a diameter between about 10 mm and about 20 mm.
Da der Lichtstrahl mit dem zweiten Winkelspektrum von der Lichtbündelungseinrichtung zur Lichtdivergenzeinrichtung geleitet wird und da das zweite Winkelspektrum kleiner als das erste Winkelspektrum ist, kann die Lichtlenkeinrichtung von der Lichtbündelungseinrichtung beabstandet sein, ohne dass wesentliche Intensitätsverluste auftreten. Da der Lichtstrahl mit dem zweiten Winkelspektrum eine Strecke zwischen der Lichtbündelungseinrichtung und der Lichtlenkeinrichtung passiert, treten keine Einkoppel- und Auskoppelverluste auf, wie sie beispielsweise bei Lichtleitern auftreten. Die Leuchtdiode und die Lichtbündelungseinrichtung können nahe an einem der Lichtlenkeinrichtung entgegengesetzten Befestigungsbereich der Lichtabgabeeinrichtung angeordnet sein. Dies hat den Vorteil, dass keine oder nur wenige zusätzliche Kunststoff- und Metallbauteile erforderlich sind, um die beispielsweise auf einer Platine platzierte Leuchtdiode am Befestigungsbereich zu befestigen. Das aus der Leuchtdiode austretende Licht wird durch die Lichtbündelungseinrichtung in einen Lichtstrahl mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum gewandelt, der über eine Strecke zu der relativ weit entfernten Lichtlenkeinrichtung verläuft, wo er in einen Lichtstrahl gewandelt wird, der aus der Lichtabgabeeinrichtung asymmetrisch zu deren optischer Achse austritt.Since the light beam is passed with the second angle spectrum from the light bundling device to the light divergence device and there the second angle spectrum is smaller than the first angle spectrum, the light-deflecting device may be spaced from the light-bundling device without substantial intensity losses occurring. Since the light beam with the second angular spectrum passes a distance between the light bundling device and the light-guiding device, no coupling-in and coupling-out losses occur, as occurs, for example, with optical fibers. The light-emitting diode and the light-bundling device can be arranged close to a fixing region of the light-emitting device which is opposite to the light-directing device. This has the advantage that no or only a few additional plastic and metal components are required in order to fix the light-emitting diode, for example, placed on a board on the mounting area. The light emerging from the light-emitting diode is converted by the light bundling device into a light beam with the second, smaller and preferably parallel angular spectrum, which extends over a distance to the relatively distant light-directing device, where it is converted into a light beam which is asymmetrical to the light-emitting device whose optical axis emerges.
Die Querschnittsfläche des Lichtstrahls mit einem zweiten Winkelspektrum kann größer als die leuchtende Fläche des Chips der Leuchtdiode sein. Dadurch wirken sich Positions- und Winkeltoleranzen zwischen der Lichtbündelungseinrichtung, der Leuchtdiode, des Chips in der Leuchtdiode, einer Lötverbindung zwischen der Leuchtdiode und der Platine sowie Montagetoleranzen zwischen der Platine und dem Befestigungsbereich weniger stark auf die Position und Orientierung des Lichtstrahls mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum aus. Typischerweise weist die Leuchtdiode eine Linse auf, wobei das erste Winkelspektrum des aus der Leuchtdiode austretenden Lichts einen Bereich von etwa 20° bis etwa 130°, vorzugsweise etwa 50° bis etwa 130°, höchstvorzugsweise etwa 110° bis etwa 130° aufweist. Das Winkelspektrum kann derart definiert werden, dass die Intensität des Lichtes am Rand des Winkelspektrums etwa 50% der Maximalintensität beträgt, wie bei Leuchtdioden üblich ist. Ein großes Winkelspektrum des von der Leuchtdiode abgegebenen Lichtstrahls erlaubt größere Montagetoleranzen zwischen der Lichtbündelungseinrichtung, der Leuchtdiode, dem Chip in der Leuchtdiode, der Linse in der Leuchtdiode, der Lötverbindung zwischen der Leuchtdiode und der Platine sowie zwischen der Platine und dem Befestigungsbereich, ohne dass dadurch die Qualität des Lichtstrahls mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum zu stark beeinträchtigt wird.The cross-sectional area of the light beam having a second angular spectrum may be larger than the luminous area of the chip of the light-emitting diode. As a result, position and angle tolerances between the light bundling device, the light-emitting diode, the chip in the light-emitting diode, a solder connection between the light-emitting diode and the board, and assembly tolerances between the board and the fastening region have less effect on the position and orientation of the light beam with the second, smaller one and preferably parallel angle spectrum. Typically, the light emitting diode comprises a lens, wherein the first angular spectrum of the light emerging from the light emitting diode has a range of about 20 ° to about 130 °, preferably about 50 ° to about 130 °, most preferably about 110 ° to about 130 °. The angle spectrum can be defined in such a way that the intensity of the light at the edge of the angular spectrum is about 50% of the maximum intensity, as is customary with light-emitting diodes. A large angular spectrum of the light beam emitted by the light-emitting diode permits greater assembly tolerances between the light-bundling device, the light-emitting diode, the chip in the light-emitting diode, the lens in the light-emitting diode, the solder connection between the light-emitting diode and the circuit board, and between the circuit board and the fastening region the quality of the light beam with the second, smaller and preferably parallel angle spectrum is excessively impaired.
Die Lichtbündelungseinrichtung kann gegenüber dem Gehäuse abgedichtet sein. Hierfür kann beispielsweise ein O-Ring zwischen dem Gehäuse und der Lichtbündelungseinrichtung angeordnet sein. In diesem Fall weist die Lichtabgabeeinrichtung eine Redundanz auf und kann in eine höhere Schutzklasse eingeordnet werden.The light bundling device may be sealed relative to the housing. For this purpose, for example, an O-ring between the housing and the Lichtbündelungseinrichtung be arranged. In this case, the light emitting device on a redundancy and can be classified in a higher protection class.
Ferner erlaubt diese Lichtabgabeeinrichtung eine einfache Verkabelung, da die Platine in der Nähe des Befestigungsbereichs angeordnet ist, von wo der Lichtabgabeeinrichtung Strom zugeführt wird.Further, this light emitting device allows easy wiring because the board is located near the mounting area from which power is supplied to the light emitting device.
Vorzugsweise ist die Leuchtdiode eine SMD-Leuchtdiode, die auf einer Platine durch Löten befestigt ist. Da die erfindungsgemäße Lichtabgabeeinrichtung relativ tolerant gegenüber Herstellungstoleranzen ist, kann das Positionieren der Leuchtdiode durch Löten erfolgen. Ferner erfolgt je nach Löttechnik ein Zentrieren der SMD-Leuchtdiode auf den Anschlüssen der Platine. SMD-Leuchtdioden weisen typischerweise ein großes Winkelspektrum, d.h. einen großen Öffnungswinkel, zwischen etwa 50° und etwa 120° auf. Für die beschriebene Anwendung ist vorgesehen, dass die Lichtbündlungseinrichtung einen divergenten oder konvergenten Lichtstrahl mit dem zweiten Winkelspektrum erzeugt, das etwa ±15°, bevorzugt etwa ±10°, mehr bevorzugt etwa ±5°, höchst bevorzugt etwa ±1,5° beträgt.Preferably, the light emitting diode is an SMD light emitting diode which is fixed on a circuit board by soldering. Since the light emitting device according to the invention is relatively tolerant of manufacturing tolerances, the positioning of the light emitting diode can be carried out by soldering. Furthermore, depending on the soldering technique, a centering of the SMD light emitting diode on the terminals of the board. SMD LEDs typically have a large angular spectrum, i. a large opening angle, between about 50 ° and about 120 °. For the described application, it is contemplated that the light bundling device will produce a divergent or convergent light beam having the second angular spectrum which is about ± 15 °, preferably about ± 10 °, more preferably about ± 5 °, most preferably about ± 1.5 °.
Die Haushaltsgerätlichtabgabeeinrichtung kann eine Mehrzahl von Leuchtdioden aufweisen, wobei die Lichtbündelungseinrichtung das Licht der Mehrzahl von Leuchtdioden in einen Lichtstrahl mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum wandelt. Dadurch entsteht eine besonders lichtstarke und/oder eine redundante Lichtabgabeeinrichtung für ein Haushaltsgerät. Die Lichtkeulen der Leuchtdioden überlappen sich vorzugsweise, wenn sie an der Lichtbündelungseinrichtung auftreffen.The household appliance light emitting device may comprise a plurality of light emitting diodes, wherein the light condensing device converts the light of the plurality of light emitting diodes into a light beam having the second, smaller and preferably parallel angular spectrum. This results in a particularly bright and / or a redundant light emitting device for a household appliance. The light lobes of the light-emitting diodes preferably overlap when they impinge on the light-bundling device.
Die Lichtbündelungseinrichtung kann eine Sammellinse, insbesondere eine Fresnel-Linse sein. Die Lichtbündelungseinrichtung kann ein Kollminator sein. Der Abstand zwischen der Lichtbündelungseinrichtung und der Lichtlenkeinrichtung kann größer gleich etwa 5 mm, vorzugsweise größer gleich etwa 7,5 mm und höchstvorzugsweise größer gleich etwa 10 mm sein. Der Querschnitt des Lichtstrahls mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum beträgt etwa 3 bis etwa 20 mm, vorzugsweise etwa 5 bis etwa 15 mm, höchstvorzugsweise etwa 8 bis etwa 12 mm. Das Winkelspektrum des aus der Lichtabgabeeinrichtung austretenden Lichtstrahls beträgt etwa 20° bis etwa 60°, vorzugsweise etwa 30° bis etwa 50°, höchstvorzugsweise etwa 35° bis etwa 50°.The light bundling device may be a converging lens, in particular a Fresnel lens. The light bundling device may be a collimator. The distance between the light-bundling device and the light-directing device can be greater than or equal to approximately 5 mm, preferably greater than or equal to approximately 7.5 mm and most preferably greater than or equal to approximately 10 mm. The cross section of the light beam having the second, smaller and preferably parallel angular spectrum is about 3 to about 20 mm, preferably about 5 to about 15 mm, most preferably about 8 to about 12 mm. The angular spectrum of the light beam emerging from the light emitting device is about 20 ° to about 60 °, preferably about 30 ° to about 50 °, most preferably about 35 ° to about 50 °.
Die Lichtbündelungseinrichtung und eine Platine, auf welcher die Leuchtdiode angeordnet ist, können zueinander räumlich festgelegt sein. Dadurch vermindert sich die eingangs beschriebene Toleranzkette für den Lichtstrahl mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum auf die Positionstoleranz des Chips der Leuchtdiode, der Linse der Leuchtdiode, der Leuchtdiode zur Platine und der Platine zur Lichtbündelungseinrichtung. Die Lichtbündelungseinrichtung und die Platine können miteinander befestigt sein. Die Platine kann Ausnehmungen aufweisen, in die Vorsprünge der Lichtbündelungseinrichtung eingreifen. Die Ausnehmungen können sich am Rand der Platine befinden oder als Öffnungen ausgebildet sein. Die Vorsprünge der Lichtbündelungseinrichtung können Arme sein. An den Armen können Rastmittel ausgebildet sein. Die Platine kann in der Lichtbündelungseinrichtung angeordnet sein.The light bundling device and a circuit board, on which the light-emitting diode is arranged, can be spatially fixed to one another. This reduces the tolerance chain described above for the light beam with the second, smaller and preferably parallel angle spectrum on the position tolerance of the chip of the light emitting diode, the lens of the light emitting diode, the light emitting diode to the board and the board for Lichtbündelungseinrichtung. The light bundling device and the circuit board can be fastened together. The circuit board can have recesses into which projections of the light bundling device engage. The recesses may be located at the edge of the board or be formed as openings. The projections of the light bundling device may be arms. On the arms locking means may be formed. The circuit board can be arranged in the light bundling device.
Die Lichtbündelungseinrichtung kann gegenüber einem Gehäuse der Leuchtdiode räumlich festgelegt sein, insbesondere indem die Lichtbündelungseinrichtung einen zum Gehäuse der Leuchtdiode komplementären Bereich aufweist, der die Lichtbündelungseinrichtung gegenüber der Leuchtdiode räumlich festlegt. Die Lichtbündelungseinrichtung kann ein Gehäuse aufweisen, das an seinem der Platine zugewandten Bereich eine zum Gehäuse der LED komplementäre Ausnehmung aufweist. Somit kann das Gehäuse der Lichtbündelungseinrichtung über dem Gehäuse der LED positioniert werden, und das Gehäuse der LED legt das Gehäuse der Lichtbündelungseinrichtung räumlich fest. Der komplementäre Bereich kann am gesamten Gehäuse der Leuchtdiode anliegen oder er kann lediglich an vier Punkten oder zwei Ecken am Gehäuse der Leuchtdiode anliegen. Hierdurch können die durch die Platine verursachten Toleranzen eliminiert werden.The light bundling device can be spatially fixed relative to a housing of the light-emitting diode, in particular in that the light-bundling device has a region which is complementary to the housing of the light-emitting diode and fixes the light bundling device spatially relative to the light-emitting diode. The light bundling device may have a housing which has a recess complementary to the housing of the LED at its region facing the printed circuit board. Thus, the housing of the light concentrator can be positioned over the housing of the LED, and the housing of the LED spatially fixes the housing of the light concentrator. The complementary region can rest against the entire housing of the light-emitting diode or it can rest only at four points or two corners on the housing of the light-emitting diode. As a result, the tolerances caused by the board can be eliminated.
Die Platine kann am Gehäuse der Haushaltsgerätlichtabgabeeinrichtung so angeordnet sein, dass die Position der Platine in Richtung der optischen Achse der Haushaltsgerätlichtabgabeeinrichtung und/oder senkrecht zur Richtung der optischen Achse der Haushaltsgerätlichtabgabeeinrichtung durch das Gehäuse der Haushaltsgerätlichtabgabeeinrichtung festgelegt wird. Dadurch kann die Position der Platine und damit die Position der Leuchtdiode einschließlich des Chips und der Linse und die Position der Lichtbündelungseinrichtung zum Gehäuse der Haushaltsgerätlichtabgabeeinrichtung relativ genau festgelegt werden. Da die Lichtlenkeinrichtung integral mit dem Gehäuse der Haushaltsgerätlichtabgabeeinrichtung ausgebildet ist, können die Toleranzen der Toleranzkette weiter reduziert werden und es ergibt sich eine Lichtabgabe, die relativ niedrigen Exemplarstreuungen unterliegt.The board may be arranged on the housing of the household appliance light emitting device so that the position of the board in the optical axis direction of the household appliance light emitting device and / or perpendicular to the optical axis direction of the household appliance light emitting device is determined by the housing of the household appliance light emitting device. Thereby, the position of the board and thus the position of the light emitting diode including the chip and the lens and the position of the light bundling device to the housing of the household appliance light emitting device can be relatively accurately determined. Since the light-deflecting device is integral is formed with the housing of the household appliance light-emitting device, the tolerances of the tolerance chain can be further reduced and there is a light output, which is subject to relatively low Exemplarstreuungen.
Das Gehäuse der Haushaltsgerätlichtabgabeeinrichtung kann einen ersten Bereich mit einem ersten Querschnitt und einen zweiten Bereich mit einem zweiten Querschnitt aufweisen, wobei der erste Bereich einen kleineren Querschnitt als der zweite Bereich aufweist, ein stufenförmiger Übergang zwischen dem ersten und zweiten Bereich vorhanden ist, die Platine und die Lichtbündelungseinrichtung vom zweiten Bereich senkrecht zur optischen Achse der Haushaltsgerätlichtabgabeeinrichtung festgelegt wird und der stufenförmige Übergang die Platine und die Lichtbündelungseinrichtung in Richtung der optischen Achse festlegt. Da die Lichtlenkeinrichtung integral mit dem Gehäuse der Haushaltsgerätlichtabgabeeinrichtung ausgebildet ist, eignet sich diese Ausführungsform besonders für ein Gussverfahren.The housing of the household appliance light emitting device may have a first region with a first cross section and a second region with a second cross section, wherein the first region has a smaller cross section than the second region, a step-shaped transition between the first and second region is present, the circuit board and the light condensing device is set from the second region perpendicular to the optical axis of the household appliance light emitting device and the stepped transition determines the board and the light condensing device in the direction of the optical axis. Since the light-directing device is formed integrally with the housing of the household appliance light-emitting device, this embodiment is particularly suitable for a casting process.
Bei einer alternativen Ausführungsform kann die Platine an einem Deckel angeordnet sein. Der Deckel kann, beispielsweise mittels einer Einschnapptechnik, am Gehäuse entgegengesetzt zur Lichtlenkeinrichtung befestigt sein. Die Linse kann, wie zuvor beschrieben, an der Platine angeordnet sein. Bei dieser Ausführungsform können Größenabweichungen der Platine, die beispielsweise ±0,15 mm betragen können, kompensiert werden, da die Platine nicht am Gehäuse anliegt. Die Größentoleranz der Platine kann somit nicht zu einem Klemmen der Platine im Gehäuse, nicht zu einer Verformung des Gehäuses und nicht zu einem Spiel der Platine im Gehäuse führen.In an alternative embodiment, the board may be arranged on a lid. The lid may be fixed, for example by means of a snap-in technique, on the housing opposite to the light-directing device. The lens may be disposed on the board as previously described. In this embodiment, size deviations of the board, which may be, for example ± 0.15 mm, can be compensated because the board is not applied to the housing. The size tolerance of the board can thus not lead to a jamming of the board in the housing, not to a deformation of the housing and not to a game of the board in the housing.
Die Erfindung sieht ferner ein Haushaltsgerät gemäß Anspruch 13 vor. Eine in dem Haushaltsgerät enthaltene Dichtungsanordnung umfasst eine elastische Dichtung mit zumindest einer Aufnahme und eine erfindungsgemäße Haushaltsgerätlichtabgabeeinrichtung. Die Haushaltsgerätdichtungsanordnung kann im Bottich einer Waschmaschine angeordnet sein und die Trommel gegenüber dem Gehäuse abdichten. Die Aufnahme nimmt einen der Leuchtdiode entgegengesetzten Bereich des Gehäuses der Haushaltsgerätlichtabgabeeinrichtung auf. Die Aufnahme kann eine Ausnehmung in der Dichtung sein. Der der Leuchtdiode entgegengesetzte Bereich des Gehäuses wird vorteilhafterweise mit einem runden Querschnitt ausgebildet, um eine möglichst gute Dichtwirkung im Zusammenspiel mit der vorzugsweise elastischen Dichtung zu bewirken. Die Dichtanordnung hat den Vorteil, dass die Abwärme der Leuchtdiode nicht oder nur zu einem geringen Teil in die Dichtung geführt wird, was die Lebensdauer der Dichtung erhöht. Durch die thermische Belastung aufgrund der Abwärme der Leuchtdiode kann die Lebensdauer der Dichtung verkürzt werden. Ferner kann die Leiterplatte in einer beliebigen Form, beispielsweise rechteckig, ausgeführt werden und muss nicht notwendigerweise rund sein, was der Fall wäre, wenn die Leuchtdiode an der Lichtaustrittsöffnung angeordnet wäre.The invention further provides a household appliance according to claim 13. A sealing arrangement contained in the household appliance comprises an elastic seal with at least one receptacle and a household appliance light emitting device according to the invention. The household appliance sealing arrangement can be arranged in the tub of a washing machine and seal the drum with respect to the housing. The receptacle accommodates a region of the housing of the household appliance light-emitting device opposite to the light-emitting diode. The receptacle may be a recess in the seal. The light-emitting diode of the opposite region of the housing is advantageously formed with a round cross-section in order to effect the best possible sealing effect in interaction with the preferably elastic seal. The sealing arrangement has the advantage that the waste heat the LED is not or only partially guided into the seal, which increases the life of the seal. Due to the thermal load due to the waste heat of the LED, the life of the seal can be shortened. Further, the circuit board can be made in any shape, such as rectangular, and does not necessarily have to be round, which would be the case if the light emitting diode was arranged at the light exit opening.
Die Ausnehmung in der Dichtung kann als Öffnung oder auch als Sackloch ausgebildet sein, die bzw. das den der Leuchtdiode entgegengesetzten Bereich des Gehäuses der Haushaltsgerätlichtabgabeeinrichtung aufnimmt. Durch das Sackloch in der Dichtung wird eine besonders zuverlässige Haushaltsgerätdichtungsanordnung geschaffen. Die Dichtung sollte in diesem Fall zumindest im Bereich der Aufnahme oder des Sacklochs aus einem semitransparenten oder transparenten Material gebildet sein. Die Dichtung kann in einem von der Aufnahme oder dem Sackloch entfernten Bereich nicht transparent ausgebildet sein.The recess in the seal may be formed as an opening or as a blind hole, which receives the light-emitting diode of the opposite region of the housing of the household appliance light emitting device. Through the blind hole in the seal a particularly reliable home appliance sealing arrangement is created. The seal should be formed in this case, at least in the region of the receptacle or the blind hole of a semi-transparent or transparent material. The seal may not be transparent in a region remote from the receptacle or the blind hole.
Das Haushaltsgerät ist eine Waschmaschine oder ein Wäschetrockner. Die Dichtungsanordnung kann an einer Trommel des Haushaltsgeräts angeordnet sein. Bei einem solchen Haushaltsgerät kann einerseits die Trommel gut ausgeleuchtet werden und andererseits das Spaltmaß zwischen der Trommel und dem Gehäuse niedrig gehalten werden.The household appliance is a washing machine or a tumble dryer. The seal assembly may be disposed on a drum of the household appliance. In such a household appliance, on the one hand, the drum can be well illuminated and on the other hand, the gap between the drum and the housing can be kept low.
Die Erfindung wird nun unter Bezugnahme auf die beigefügten Figuren detaillierter beschrieben, wobei:
Figur 1- ein schematischer Schnitt durch eine erfindungsgemäße Haushaltsgerätlichtabgabeeinrichtung ist,
Figur 2- eine schematische Draufsicht auf eine Platine der Haushaltsgerätlichtabgabeeinrichtung ist,
- Figur 3
- ein Schnitt durch das Gehäuse und die Platine der Haushaltsgerätlichtabgabeeinrichtung ist und
Figur 4- ein Schnitt durch eine Dichtung mit einer Haushaltsgerätlichtabgabeeinrichtung ist.
- FIG. 1
- a schematic section through a household appliance light emitting device according to the invention,
- FIG. 2
- is a schematic plan view of a board of the household appliance light emitting device,
- FIG. 3
- a section through the housing and the board of the household appliance light emitting device is and
- FIG. 4
- is a section through a seal with a household appliance light emitting device.
Die nachstehend beschriebene Lichtabgabeeinrichtung 50 für ein Haushaltsgerät kann verwendet werden, um die Trommel oder andere rotierende Bauteile eines Haushaltsgeräts, beispielsweise einer Waschmaschine oder eines Wäschetrockners, zu beleuchten.The household appliance
Es wird auf
Die Lichtlenkeinrichtung 4 weist an ihrer der Leuchtdiode zugewandten Seite eine Mehrzahl prismenartiger Elemente 20 auf. Durch ein prismenartiges Element wird ein darauf auftreffender Lichtstrahl zum Lot der Fläche gebrochen, auf die der Lichtstrahl auftrifft. Da die Flächen der prismenartigen Elemente 20, auf die Lichtstrahlen auftreffen, näherungsweise den gleichen Winkel zur optischen Achse 1 der Lichtabgabeeinrichtung aufweisen, werden alle Strahlen im wesentlichen in die gleiche Richtung abgelenkt, sofern sie mit dem gleichen Winkel auf das prismenartige Element auftreffen. Da eine Mehrzahl prismenartiger Elemente vorgesehen ist, kann die Lichtlenkeinrichtung mit einer relativ geringen Dicke ausgebildet werden. Es ist auch möglich, eine geringere Anzahl prismenartiger Elemente oder auch nur ein prismenartiges Element vorzusehen, allerdings erhöht sich hierdurch die Dicke der Lichtlenkeinrichtung 4.The light-deflecting
Die prismenartigen Elemente 20 sind bei der dargestellten Ausführungsform nicht rotationssymmetrisch sondern linear ausgebildet. Die
An der der Leuchtdiode 10 abgewandten Seite der Lichtlenkeinrichtung 4 sind eine Mehrzahl Homogenisierungsmittel 34, 36 angeordnet. Bei der hier beschriebenen Ausführungsform sind Lichthomogenisierungsmittel von einem ersten Typ 34 und von einem zweiten Typ 36 vorgesehen. Die Homogenisierungsmittel 34, 36 können als Sammellinsen und/oder Streulinsen ausgebildet sein. Die Homogenisierungsmittel 34, 36 bewirken, dass der von der Lichtabgabeeinrichtung abgegebene Lichtstrahl ein definiertes Winkelspektrum aufweist. Dabei weist der erste Typ von Homogenisierungsmittel 34 einen ersten Radius und der zweite Typ von Homogenisierungsmittel 36 einen zweiten Radius auf, der sich vom ersten Radius unterscheidet. Beispielsweise weist der erste Typ von Homogenisierungsmittel 34 einen Radius von etwa 0,8 mm bis etwa 1,2 mm und der zweite Typ von Homogenisierungsmittel 36 einen zweiten Radius von 0,15 mm bis etwa 0,25 mm auf. Die Homogenisierungsmittel 34 des ersten Typs und die Homogenisierungsmittel 36 des zweiten Typs können alternierend zueinander angeordnet sein. Der Öffnungswinkel des aus dem Homogenisierungsmittel austretenden Lichtstrahls kann etwa 20° bis etwa 60°, vorzugsweise etwa 30° bis etwa 50°, höchst vorzugsweise 35° bis etwa 50° betragen. Die Lichtlenkeinrichtung 4 kann einen Durchmesser von etwa 10 mm bis etwa 20 mm aufweisen.
Die Sammellinse 6 ist mittels Arme 24 mit optionalen Rastnasen (nicht gezeigt) an der Platine 12 befestigt. Die Platine 12 kann Öffnungen 34 (siehe
The converging
Am Gehäuse 2 sind Vorsprünge 32 vorgesehen, die die Platine in ihrer Position in Richtung der optischen Achse der Lichtabgabeeinrichtung festlegen. Die Platine 12 hat einen Außendurchmesser, der dem Innendurchmesser des Gehäuses 2 der Lichtabgabeeinrichtung entspricht, so dass das Gehäuse 2 die Platine 12 auch in ihrer Position senkrecht zur optischen Achse der Lichtabgabeeinrichtung festlegt.On the
Es wird auf
Die Sammellinse 6 ist somit relativ genau mit der Platine 12 ausgerichtet. Durch Verwendung geeigneter Löttechniken wird die Leuchtdiode 10, falls eine SMD-Leuchtdiode verwendet wird, auf den dafür vorgesehenen Lötflächen (Pad) zentriert. Dadurch ergibt sich auf kostengünstige Weise eine vergleichsweise genaue Ausrichtung der optischen Achse der Leuchtdiode mit der optischen Achse der Sammellinse 6. Dies erhöht die Qualität der Lichtabgabe der Haushaltsgerätlichtabgabeeinrichtung.The converging
Es wird auf
Der Übergang zwischen dem ersten Bereich 2a und dem zweiten Bereich 2b des Gehäuses 2 ist stufenförmig. Der stufenförmige Übergang legt die Position der Platine 12 in Richtung der optischen Achse der Lichtabgabeeinrichtung fest. Der Innendurchmesser des zweiten Bereichs 2b legt die Position der Platine 12 senkrecht zur optischen Achse der Lichtabgabeeinrichtung fest. Die Lichtlenkeinrichtung 4 ist integral mit dem ersten Bereich 2a ausgebildet. Folglich weist das Gehäuse 2 mit den beiden Bereichen 2a und 2b keine Hinterschneidungen auf, so dass es durch eine Gusstechnik, beispielsweise Spritzguss, hergestellt werden kann. Der Innendurchmesser des zweiten Bereichs 2b ermöglicht eine relativ genaue Ausrichtung der Platine 12 und somit der optischen Achse der Leuchtdiode 10 und der Sammellinse 6, wie zuvor unter Bezugnahme auf
Die Sammellinse 6 kann gegenüber dem Gehäuse 2 abgedichtet sein. Hierfür kann beispielsweise ein O-Ring (nicht gezeigt) zwischen dem Gehäuse 2 und der Sammellinse 6 angeordnet sein.The
Die Platine 12 wird mittels eines Andrückelements (nicht gezeigt) gegen den stufenförmigen Bereich des Gehäuses 2 der Lichtabgabeeinrichtung gedrückt. Vorzugsweise ist das Andrückelement integral mit dem Deckel 30 ausgebildet. Der Deckel 30 kann mittels einer Rastnase (nicht gezeigt) am Gehäuse 2 einrasten.The
Bei einer anderen Ausführungsform (nicht gezeigt) kann die Platine am Deckel angeordnet sein. Der Deckel kann, beispielsweise mittels einer Einschnapptechnik, am Gehäuse befestigt sein. Die Linse kann, wie zuvor beschrieben, an der Platine angeordnet sein. Bei dieser Ausführungsform können Größenabweichungen der Platine, die beispielsweise ±0,15 mm betragen können, kompensiert werden, da die Platine nicht am Gehäuse anliegt. Die Größentoleranz der Platine kann somit nicht zu einem Klemmen der Platine im Gehäuse, nicht zu einer Verformung des Gehäuses und nicht zu einem Spiel der Platine im Gehäuse führen. Diese Ausführungsform hat einen einfacheren Aufbau und kann einfacher montiert werden. Bei dieser Ausführungsform ist auch die Verkabelung einfacher zu realisieren.In another embodiment (not shown), the board may be located on the lid. The lid may be fastened to the housing, for example by means of a snap-in technique. The lens may be disposed on the board as previously described. In this embodiment, size deviations of the board, which may be, for example ± 0.15 mm, can be compensated because the board is not applied to the housing. The size tolerance of the board can thus not lead to a jamming of the board in the housing, not to a deformation of the housing and not to a game of the board in the housing. This embodiment has a simpler structure and can be easily mounted. In this embodiment, the wiring is easier to implement.
Es wird nochmals auf
Das Gehäuse 2 der Lichtabgabeeinrichtung 50 kann zumindest ein spitzes vom Gehäuse 2 weg ragendes Dichtelement 54 aufweisen, das zum einen die Lichtabgabeeinrichtung 50 in ihrer Position gegenüber der Dichtung festlegt und verhindert, dass eine Flüssigkeit durch die Dichtung 70 im Bereich der Ausnehmung hindurch tritt. Ferner sind optionale Befestigungsmittel 60 vorgesehen, die die Lichtabgabeeinrichtung 50 in ihrer Position gegenüber einem Haushaltsgerät festlegen und/oder von der LED erzeugte Wärme abführen. Die Lichtabgabeeinrichtung wird über ein Kabel 52 mit Strom versorgt.The
Die in
Claims (13)
- A household appliance light-emitting device (50), with- a light-emitting diode (10) which is adapted to emit a light beam having a cross-sectional area and a first angular spectrum,- a housing (2) in which the light-emitting diode (10) is arranged, and- a light-guiding device (4) through which the light beam (8) passes and which is adapted to deflect the incoming light beam (8) in such a way that the light beam (22) is emitted from the light-guiding device (4) asymmetrically with respect to the optical axis of the household appliance light-emitting device,characterised in that the light-guiding device (4) is integrally formed with the housing, that a light-focusing device (6) is spatially arranged between the light-emitting diode and the light-guiding device, which is adapted to change the light beam from the light-emitting diode to a light beam (8) with a second angular spectrum which is smaller than the first angular spectrum, and that the light beam propagates along a distance (S) from the light-focusing device to the light-guiding device.
- The household appliance light-emitting device (50) according to Claim 1,
wherein the light-guiding device (4) comprises at least one prism-type element (20), in particular a plurality of prism-type elements arranged in a rotationally asymmetrical manner with respect to the optical axis of the household appliance light-emitting device (50). - The household appliance light-emitting device (50) according to Claim 2,
wherein the at least one prism-type element (20) is linearly formed and the longitudinal axis thereof extends in a plane perpendicular to the optical axis (1) of the household appliance light-emitting device (50). - The household appliance light-emitting device (50) according to Claim 2 or 3,
wherein a plurality of prism-type elements are arranged on the side of the light-guiding device (4) facing towards the light-emitting diode (10). - The household appliance light-emitting device (50) according to one of Claims 1 to 4,
further comprising homogenising means (34, 36) which are arranged on the side of the light-guiding device (4) facing away from the light-emitting diode (10) and which are adapted to effect that the light beam (8) emitted from the household appliance light-emitting device exhibits a defined angular spectrum. - The household appliance light-emitting device (50) according to one of the previous claims,
wherein the light-focusing device (6) is sealed against the housing (2). - The household appliance light-emitting device (50) according to one of the previous claims,
wherein the light-focusing device (6) is a collective lens, in particular a Fresnel lens, or a collimator. - The household appliance light-emitting device (50) according to one of Claims 1 to 7,
wherein the light beam (22) emitting from the household appliance light-emitting device (50) is deflected by about 20 ° to about 70 °, preferably by about 30 ° to about 60 °, most preferably by about 35 ° to about 55 °, asymmetrically with respect to the optical axis of the household appliance light-emitting device (50). - The household appliance light-emitting device (50) according to one of the previous claims,
wherein the light-focusing device (6) and a circuit board (12) are spatially defined with respect to one another, in particular in that the light-focusing device and the circuit board are fastened to one another. - The household appliance light-emitting device (50) according to Claim 9, wherein the circuit board comprises recesses (34) into which projections (24) of the light-focusing device (6) engage.
- The household appliance light-emitting device (50) according to one of the previous claims,
wherein the light-focusing device (6) is spatially defined in relation to a housing of the light-emitting diode (10), in particular in that the light-focusing device comprises a region complementary to the housing of the light-emitting diode, which spatially defines the light-focusing device in relation to the light-emitting diode. - The household appliance light-emitting device (50) according to one of the previous claims,
wherein the housing (2) of the household appliance light-emitting device comprises a first region (2a) with a first cross-section and a second region (2b) with a second cross-section, wherein the first region (2a) has a smaller cross-section than the second region (2b), a stepped transition between the first and the second regions (2a, 2b) is provided, a circuit board (12) and the light-focusing device (6) are defined perpendicular to the optical axis of the household appliance light-emitting device by the second region (2b) and the stepped transition defines the circuit board (12) and the light-focusing device (6) in the direction of the optical axis of the household appliance light-emitting device. - A household appliance in the form of a washing machine or a tumble dryer with a household appliance light-emitting device (50) according to one of the previous claims for illuminating a rotating drum of the household appliance, wherein the household appliance light-emitting device is seated in a receptacle in an elastic seal of the household appliance, which seals a gap between the drum and a housing of the household appliance, and wherein the household appliance light-emitting device is oriented in such a manner that the light beam emitted under an angle impinges at least mainly inside the drum.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI201031497T SI2459795T1 (en) | 2009-07-27 | 2010-07-27 | Light emitting device for a drum of a household appliance |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009034841.7A DE102009034841B4 (en) | 2009-07-27 | 2009-07-27 | Light emitting device for a drum of a household appliance |
PCT/EP2010/004599 WO2011012292A1 (en) | 2009-07-27 | 2010-07-27 | Light emitting device for a drum of a household appliance |
Publications (2)
Publication Number | Publication Date |
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EP2459795A1 EP2459795A1 (en) | 2012-06-06 |
EP2459795B1 true EP2459795B1 (en) | 2017-06-14 |
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EP10742429.3A Active EP2459795B1 (en) | 2009-07-27 | 2010-07-27 | Light emitting device for a drum of a household appliance |
Country Status (7)
Country | Link |
---|---|
US (1) | US9170001B2 (en) |
EP (1) | EP2459795B1 (en) |
CN (1) | CN102471980B (en) |
DE (1) | DE102009034841B4 (en) |
PL (1) | PL2459795T3 (en) |
SI (1) | SI2459795T1 (en) |
WO (1) | WO2011012292A1 (en) |
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Also Published As
Publication number | Publication date |
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EP2459795A1 (en) | 2012-06-06 |
WO2011012292A1 (en) | 2011-02-03 |
CN102471980B (en) | 2014-08-06 |
DE102009034841A1 (en) | 2011-02-03 |
DE102009034841B4 (en) | 2020-11-26 |
SI2459795T1 (en) | 2017-10-30 |
US20120120667A1 (en) | 2012-05-17 |
US9170001B2 (en) | 2015-10-27 |
CN102471980A (en) | 2012-05-23 |
PL2459795T3 (en) | 2017-09-29 |
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