WO2009081308A2 - Récipient comportant un espace pour contenir un liquide, comprenant un moyen pour indiquer le niveau du liquide - Google Patents

Récipient comportant un espace pour contenir un liquide, comprenant un moyen pour indiquer le niveau du liquide Download PDF

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Publication number
WO2009081308A2
WO2009081308A2 PCT/IB2008/055225 IB2008055225W WO2009081308A2 WO 2009081308 A2 WO2009081308 A2 WO 2009081308A2 IB 2008055225 W IB2008055225 W IB 2008055225W WO 2009081308 A2 WO2009081308 A2 WO 2009081308A2
Authority
WO
WIPO (PCT)
Prior art keywords
container
light
light guide
liquid
space
Prior art date
Application number
PCT/IB2008/055225
Other languages
English (en)
Other versions
WO2009081308A3 (fr
Inventor
Bart A. Salters
Marcellinus P. C. M. Krijn
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2009081308A2 publication Critical patent/WO2009081308A2/fr
Publication of WO2009081308A3 publication Critical patent/WO2009081308A3/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/44—Parts or details or accessories of beverage-making apparatus
    • A47J31/4403—Constructional details
    • A47J31/4457—Water-level indicators
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/21—Water-boiling vessels, e.g. kettles
    • A47J27/212—Water-boiling vessels, e.g. kettles with signaling means, e.g. whistling kettles
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J2203/00—Devices having filling level indicating means

Definitions

  • Container having a space for containing a liquid, comprising means for indicating the level of the liquid
  • the present invention relates to a container comprising a space for containing a liquid, a wall encompassing the space, and means for indicating the level of the liquid in the container.
  • the present invention also relates to a domestic appliance such as a coffeemaker, a water boiler or a steam iron, comprising a container as mentioned.
  • a lot of products in particular domestic appliances such as coffeemakers, water boilers and steam irons, comprise a container comprising a space for containing water, and a wall encompassing the space.
  • the wall of the container comprises a bottom portion and a standing, cylindrically-shaped portion extending from the circumference of the bottom portion.
  • the container may simply be open, or a lid or the like may be provided for closing the space of the container in a normal position, wherein the lid may temporarily be put to an opened position by a user for the purpose of supplying water to the space.
  • the containers are usually equipped with means for indicating the level of the water in the container.
  • the water level indicating means comprise a small, floating element.
  • major disadvantages of the application of such an element are that it does not provide a very accurate indication of the level of the water, and that it is hard to see.
  • the level of the water is measured electronically, and is indicated by a series of light emitting diodes (LEDs).
  • LEDs light emitting diodes
  • the container simply comprises a window, so that a user may check the level of the water through that window.
  • the level of the water is hard to see, especially when environmental lighting conditions are far from optimal, which is not inconceivable in a domestic environment such as a kitchen.
  • a container comprising a space for containing a liquid, a wall encompassing the space, and means for indicating the level of the liquid in the container, wherein at least a portion of the wall of the container is permeable to light, and wherein the liquid level indicating means comprise a light source which is adapted to emit light below possible levels of the surface of the liquid in the container, in order to cause light emitted from below the surface to reflect on the surface.
  • a phenomenon known as total internal reflection is used for the purpose of lighting a quantity of liquid which is present inside the space of the container. This means that light traveling at relatively shallow angles with respect to a surface of a liquid cannot escape from the liquid, but will reflect on the surface of the liquid instead.
  • a light source which is adapted to emit light below a surface of the liquid is applied.
  • the light source is furthermore adapted to emit light in directions which are horizontal and close to horizontal in a normal orientation of the container, i.e. at relatively shallow angles with respect to the surface of the liquid, so that as much as possible of the light will reflect on this surface.
  • a normal orientation of the container may be understood as being an operational orientation in which the container is intended to be used (?) in an appliance of which it is part.
  • the above-described process of indicating the level of the liquid which is present inside the space of the container by introducing light into the liquid, and by making sure that a total internal reflection process takes place at the surface of the liquid by introducing the light below this surface may be achieved by means of various constructional measures.
  • one or more LEDs operating at very low and thus safe voltages for example, a voltage of approximately 2.5 Volts, may be used.
  • Such LEDs may simply be mounted below the level of the liquid, inside the space of the container.
  • at least a portion of the light source may be arranged inside the space of the container.
  • the light source is adapted to emit light only in a limited range of directions, in particular in directions which are sideward in a normal orientation of the container, so that practically all of the light is emitted at relatively shallow angles with respect to the surface of the liquid during operation of the light source, in view of the fact that the surface of the liquid (always) has a horizontal orientation, and an optimal total internal reflection process may be obtained.
  • the light source may be connected to a floating member which is very well capable of following the level. In such a case, the light source is connected to the floating member at a side of the floating member which constitutes a bottom side in a normal orientation of the container, so that it is ensured that the light source is always below the surface of the water.
  • a so-called light guide is applied, which is a piece of material which is permeable to light.
  • the light guide may simply be a strip of translucent plastic.
  • at least one element for generating light is applied, wherein this lighting element is arranged at an end of the light guide, and wherein this lighting element is adapted to emit light to the interior of the light guide, at relatively shallow angles with respect to a surface of the light guide in order to reflect on this surface.
  • a surface of the light guide is a substantially planar surface which comprises portions where irregularities in the surface such as notches and/or projections are present.
  • the principle that is used for keeping light below a surface of the liquid which is present inside the space of the container, namely the principle of total internal reflection, is also used in the light guide.
  • the lighting element is used for generating light at one end of the light guide, and the light that is introduced into the light guide travels for a considerable distance, which may be tens of centimeters, through the light guide, without noticeable losses.
  • the light beams are continuously traveling from one side of the light guide to another under the influence of reflection, until the beams reach another end of the light guide and escape there.
  • a surface of the light guide is provided with irregularities at various positions, while the surface of the light guide is otherwise a substantially planar surface.
  • the light guide may be shaped like a pole, for example, and may be placed inside the space of the container so as to extend in a substantially vertical direction.
  • the light guide it is possible for the light guide to extend through a portion of the wall of the container, for example, a portion which is at a bottom side in a normal orientation of the container, wherein a major portion of the light guide extends inside the space of the container, and wherein the lighting element is arranged at an end of the light guide which is outside the space of the container.
  • light is introduced into the light guide, at one end of the light guide, and travels to another end on the basis of total internal reflection.
  • the light is not reflected such as to stay inside the light guide, as is the case at other positions, but is allowed to escape from the light guide instead.
  • This light is used to illuminate the liquid and to achieve a clearly visible difference between an illuminated area at the liquid side of the surface of the liquid and a non-illuminated area at the non-liquid side of this surface.
  • the refractive index of the liquid is higher than the refractive index of air
  • the material of the light guide may be chosen such that its refractive index is higher than the refractive index of the liquid.
  • the material of the light guide may be a plastic having a refractive index in the order of 1.5
  • the liquid may be water, which has a refractive index of about 1.33.
  • the refractive index of air is lower than these two values, namely 1.00.
  • the irregularities in the surface of the light guide may be arranged in any desired pattern.
  • the irregularities may be provided in the form of indentations which are positioned according to a regular pattern.
  • the surface of the light guide comprises roughened circumferential portions having a certain height, which are arranged at a certain mutual distance.
  • the light guide may be very easy to manufacture, especially when the material of the light guide is chosen to be plastic, wherein the pattern of irregularities may simply be realized by applying moulding techniques.
  • the entire wall of the container may be made out of one integral piece of plastic.
  • the light guide may be constituted by at least a portion of the wall of the container, so that there is no need for additional components, with the exception of the at least one lighting element.
  • the light guide may be an integral part of the container.
  • this portion is semi-transparent and adapted to scatter light impacting on its inner surface in various directions. In this way, a better visual effect is obtained than in case the portion would be like window glass, for example.
  • figure 1 shows a perspective view of a coffeemaker comprising a container according to the present invention, and serves to illustrate the fact that water which is present inside a space of the container seems to be emitting light
  • figure 2 diagrammatically shows a side view of a container which is equipped with a LED, and serves to illustrate the principle of total internal reflection
  • figure 3 diagrammatically shows a side view of a container which is equipped with an assembly of a LED and a float
  • figure 4 diagrammatically shows a bottom view of a portion of the container as shown in figure 3
  • figure 5 shows a perspective view of a light guide and LEDs
  • figures 6 and 7 diagrammatically show a side view and a top view, respectively, of a container which is equipped with a light guide
  • figure 8 once again shows a side view of a container which is equipped with a light guide, and serves to illustrate the fact that light is only emitted from
  • FIG. 1 shows a coffeemaker 1 comprising a container 2, which is also often referred to as water tank 2, and which serves for containing water to be used in the coffee-making process.
  • the water tank 2 is removably arranged with respect to a body 3 of the coffeemaker 1, so that a user may carry the water tank 2 to a tap or the like for filling the water tank 2.
  • the level of the water present inside a space 4 of the water tank 2 is clearly indicated, so that at any given moment, a user may easily judge whether filling is necessary, or may be postponed.
  • a wall 5 of the water tank 2 comprises a semi-transparent material, which may be a plastic.
  • the water is illuminated in such a way that it seems to emit light itself, as may be seen in figure 1.
  • a surface 6 of the water is clearly visible, as it is at the transition between water which seems to be brightly shining and a darker environment.
  • FIG 2 shows an embodiment of the water tank 2, in which the water tank 2 comprises a LED 10 which is arranged inside the space 4 of the water tank 2.
  • the LED 10 When water is present inside the space 4 of the water tank 2, as shown in figure 2, the LED 10 is actually in the water. However, this is not an unsafe (?) situation, as the LED 10 is (?) an LED operating at a relatively low voltage, for example, a voltage of about 2.5 Volts.
  • the LED 10 may be a colour LED 10 which is capable of emitting light in a limited range of directions.
  • the LED 10 may be a colour LED 10 which is capable of emitting light in a limited range of directions.
  • the light beams 20 travel at angles with respect to the surface 6 of the water which are so small that the light beams 20 only reflect on this surface 6.
  • the course of a number of light beams 20 is illustrated, and it can clearly be seen that the light beams 20 are reflected toward a portion of the wall 5 of the water tank 2 which is just below the surface 6 of the water, and escape from the water there.
  • said portion of the wall 5 of the water tank 2 is brightly lit, so that there is a lot of light just below the surface 6 of the water, and hardly any light above this surface 6.
  • the exact position of the surface 6 of the water may clearly be distinguished by a user.
  • the wall 5 of the water tank 2 comprises semi-transparent material, which may be a suitable plastic, so that the light impacting on the wall 5 is scattered in all directions, and the lighting effect is enhanced.
  • this position should be somewhat lower than a predetermined minimum level of the water in order to achieve the lighting effect for all possible levels of the water.
  • these means comprise a float 30, wherein the LED 10 is arranged at a bottom side of the float 30. In this way, as the float 30 is always at the level of the surface 6 of the water, it is ensured that the LED 10 is always close to this surface 6, while being in the water.
  • Electrodes 12 are provided inside the rails 11 for contacting pickup areas of the LED 10 and transmitting power to the LED 10.
  • an alternative would be to simply connect wires (not shown) to the LED 10, which wires should be long enough to remain in contact with the LED 10 in all possible positions of the LED 10 in the water tank 20.
  • FIG. 5-8 Another solution than applying a LED 10 which is arranged inside the space 4 of the water tank 2 is illustrated by figures 5-8, and comprises an application of a so-called light guide 40 and one or more LEDs 10 or other suitable lighting elements, wherein the LEDs 10 are arranged outside the space 4 of the water tank 2, and wherein at least a portion of the light guide 40 is arranged inside this space 4.
  • the light guide 40 comprises a strip of transparent material such as a transparent plastic. In principle, many shapes of the light guide 40 are possible. In figures 6-8, a light guide 40 shaped like a pole is shown.
  • one or more LEDs 10 or other suitable lighting elements are arranged for generating light.
  • the light beams 20 enter the light guide 40, and the phenomenon of total internal reflection takes place, as a result of which the light is kept inside the light guide 40.
  • the light beams 20 are introduced into the light guide 40 at shallow angles with respect to a longitudinal axis of the light guide 40, i.e. with respect to a standing, cylindrically-shaped surface of the light guide 40, so that the light beams 20 only reflect on this surface and cannot escape from the light guide 40. In this way, it is achieved that the light travels from the end 41 of the light guide 40 where the LEDs 10 are arranged to another end 42, without noticeable losses.
  • irregularities 43 are arranged in the surface of the light guide 40.
  • these irregularities 43 are tiny scratches which are arranged such as to form a pattern of tiny dots.
  • a light beam 20 reaches a dot 43, it is capable of leaving the light guide 40, as the angle of impact on the surface of the light guide 40 at the position of the dot 43 is large enough to avoid total reflection.
  • the light guide 40 is illuminated by means of the LEDs 10, it seems that light is emitted by the dot 43.
  • No electronics of any kind are present, apart from the LEDs 10 arranged at one end 41 of the light guide 40. As this end 41 may be arranged such as to be outside the space 4 of the water tank 2, into which the light guide 40 extends through the wall 5 of the water tank 2, it may be achieved that all the electronics are outside the space 4 of the water tank 2.
  • portions 43 of the surface of the light guide 40 are roughened.
  • a rough structure 43 is applied at constant intervals along the length of the light guide 40 in such a way that ring-shaped roughened portions 43 having a certain height are obtained.
  • the intervals do not need to be constant; the only thing that matters is that there should be enough roughened portions 43 to have an emission of light which is always just below the surface 6 of the water, for all possible levels of the water.
  • the roughened portions 43 have the same function as the dots 43 of the light guide 40 as shown in figure 5. Light may be extracted from the light guide 40 only at the positions of these portions 43. A factor which determines whether this will actually happen is the type of fluid surrounding the portions 43, as will be explained below.
  • the situation above the surface 6 of the water present in the space 4 of the water tank 2 differs substantially from that below the surface 6 of the water, due to the fact that above the surface 6, the light guide 40 is surrounded by air, and below the surface 6, the light guide 40 is surrounded by water.
  • differences between the refractive index of the material of the light guide 40 on the one hand and the refractive index of the fluid surrounding it are different in both situations, and since these differences determine the angle at which light can escape from the light guide 40, it is clear that different lighting effects will be obtained above and below the surface 6 of the water, so that this surface 6 may be clearly visible to a user.
  • the refractive index of common plastics is about 1.5.
  • the refractive index of air is 1.00, while the refractive index of water is significantly larger, namely about 1.33. Consequently, the difference between the refractive indices of the plastic of the light guide 40 and the water is much smaller than the difference between refractive indices of the plastic of the light guide 40 and air, in other words, the difference between refractive indices below the surface 6 of the water is much smaller than the difference between refractive indices above the surface 6 of the water.
  • the light is emitted by one or more LEDs 10, in directions which are parallel to and close to parallel to a longitudinal axis of the light guide 40, which extends in a substantially vertical direction in the shown examples.
  • Light beams 20 impacting on a roughened portion 43 of the surface of the light guide 40 situated below the level of the water in the space 4 may escape from the light guide 40. Any light that remains inside the light guide 40 apparently has a shallow angle, so that it will certainly not escape from the light guide 40 at a location above the level of the water, as the difference between the refractive indices is larger there.
  • the same lighting effect of the quantity of water present inside the space 4 of the water tank 2 is achieved as when one or more lighting elements 10 are arranged inside this space 4, whether or not attached to a float 30 or the like for following the level of the surface 6 of the water.
  • the operation of the light guide 40 may seem complex, using a light guide 40 is a very attractive option for achieving the effect that looks as if a quantity of water is emitting light itself, as this only involves having a suitable piece of plastic arranged inside the space 4 of the water tank 2, and using one or more lighting elements 10 at one end 41 thereof.
  • the water tank 2 including the light guide 40 may be manufactured of one integral piece of plastic, and the light guide 40 may even be an integral part of the wall 5 of the water tank 2.
  • Using one or more lighting elements 10 and/or a light guide 40 for indicating the water level hardly involves any additional costs, as no separate measurement system and indicator system are required. Furthermore, because it is achieved that the water present inside the space 4 of the water tank 2 seems to emit light itself, a very clear and accurate indicator is obtained.
  • a container 2 which is especially intended to be used in a domestic appliance such as a coffeemaker 1 comprises a space 4 for containing a liquid such as water, a wall 5 encompassing the space 4, and means for indicating the level of the liquid in the container 2 is disclosed.
  • the liquid level indicating means comprise a light source 10, 40 which is adapted to emit light below a surface 6 of the liquid.
  • a phenomenon known as total internal reflection may be used for illuminating the quantity of fluid present inside the space 4 of the container 2.
  • the light source 10, 40 is adapted to emit all the light at relatively shallow angles with respect to the surface 6 of the liquid, during its operation, in order to have an optimal total internal reflection process, wherein practically all the light is used for achieving the lighting effect as mentioned.
  • the light source 10, 40 comprises one or more lighting elements 10 arranged inside the space 4 of the container 2.
  • the light source 10, 40 comprises a light guide 40 extending inside the space 4 of the container 2 or being an integral part of the wall 5 of the container 2, and one or more lighting elements 10 arranged at one end 41 of the light guide 40, wherein at various positions, a surface of the light guide 40 is irregular for the purpose of allowing light to escape at these positions.
  • liquid level indicating means By using liquid level indicating means as described, it is achieved that light is introduced into the liquid, and that this light reflects against a surface 6 of the liquid and only escapes in sideward directions, so that a clearly visible distinction between the surface 6 of the liquid and an adjacent medium (?) such as air is obtained.
  • the level of the liquid is accurately indicated as the surface 6 of the liquid itself can be clearly seen.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Thermally Insulated Containers For Foods (AREA)
  • Level Indicators Using A Float (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)

Abstract

L'invention concerne un récipient (2) comportant un espace (4) destiné à contenir un liquide, une paroi (5) enveloppant l'espace (4) et un moyen destiné à indiquer le niveau du liquide dans le récipient (2). Au moins une partie de la paroi (5) du récipient (2) est perméable à la lumière, et le moyen d'indication du niveau de liquide comprend une source lumineuse (10, 40) prévue pour émettre de la lumière au-dessous de la surface (6) du liquide afin de faire en sorte que la lumière émise au-dessous de la surface (6) se réfléchisse sur la surface (6). La source lumineuse (10, 40) peut comprendre un ou plusieurs éléments (10) d'éclairage disposés à l'intérieur de l'espace (4) du récipient (2). En outre, la source lumineuse (10, 40) peut comprendre un guide (40) de lumière, un ou plusieurs éléments (10) d'éclairage étant disposés à une extrémité (41) du guide (40) de lumière et une surface du guide (40) de lumière présentant des irrégularités à diverses positions dans le but de laisser de la lumière s'échapper à ces positions.
PCT/IB2008/055225 2007-12-18 2008-12-11 Récipient comportant un espace pour contenir un liquide, comprenant un moyen pour indiquer le niveau du liquide WO2009081308A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07123459 2007-12-18
EP07123459.5 2007-12-18

Publications (2)

Publication Number Publication Date
WO2009081308A2 true WO2009081308A2 (fr) 2009-07-02
WO2009081308A3 WO2009081308A3 (fr) 2009-08-13

Family

ID=39512537

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/055225 WO2009081308A2 (fr) 2007-12-18 2008-12-11 Récipient comportant un espace pour contenir un liquide, comprenant un moyen pour indiquer le niveau du liquide

Country Status (2)

Country Link
DE (1) DE202008016449U1 (fr)
WO (1) WO2009081308A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010010770U1 (de) * 2010-07-28 2010-12-16 Eugster/Frismag Ag Kaffeezubereitungsgerät mit wenigstens einem Zubereitungsgutbehälter mit einer Füllstandsanzeige
EP2654519B1 (fr) * 2010-12-22 2016-04-13 Koninklijke Philips N.V. Procédé et appareil à système d'éclairage pour faire infuser des ingrédients dans un solvant
DE102017214006A1 (de) * 2017-08-10 2019-02-14 BSH Hausgeräte GmbH Heißgetränkezubereitungsvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5447248A (en) * 1994-01-26 1995-09-05 Rodriguez; Kimberly J. Indicator for liquid container
WO1998012514A1 (fr) * 1996-09-20 1998-03-26 Vista Research, Inc. Jauge destinee a mesurer le niveau d'un liquide
WO1998027851A1 (fr) * 1996-12-23 1998-07-02 Strix Limited Recipients de chauffage de liquide
DE10230951A1 (de) * 2002-07-09 2004-01-22 BSH Bosch und Siemens Hausgeräte GmbH Füllstandsanzeige für Flüssigkeiten in einem Behälter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5447248A (en) * 1994-01-26 1995-09-05 Rodriguez; Kimberly J. Indicator for liquid container
WO1998012514A1 (fr) * 1996-09-20 1998-03-26 Vista Research, Inc. Jauge destinee a mesurer le niveau d'un liquide
WO1998027851A1 (fr) * 1996-12-23 1998-07-02 Strix Limited Recipients de chauffage de liquide
DE10230951A1 (de) * 2002-07-09 2004-01-22 BSH Bosch und Siemens Hausgeräte GmbH Füllstandsanzeige für Flüssigkeiten in einem Behälter

Also Published As

Publication number Publication date
WO2009081308A3 (fr) 2009-08-13
DE202008016449U1 (de) 2009-02-26

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