Abstract:
Capsule for the preparation of a beverage comprising a container and a beverage ingredient contained therein, wherein the container comprises a code ( 65 ) adapted for being identified or read by external reading means ( 62 ), wherein the code is arranged on the container to be read while the capsule is rotated around an axis of rotation traversing the capsule.

Description:
INTRODUCTION 
       [0001]    The invention relates to the preparation of a beverage by use of a capsule containing beverage ingredient in a beverage production device. The present invention in particular focuses on the detection of the capsule. 
       BACKGROUND ART 
       [0002]    The preparation of a beverage by a capsule containing beverage ingredient is known. In general, the capsule is inserted in a beverage production device, such as a coffee machine, liquid is fed in the capsule and a beverage is extracted from the capsule under pressure or by gravity. 
         [0003]    The preparation of a beverage by using the centrifugation is known. The principle mainly consists in providing beverage ingredient in a container of the capsule, feeding liquid in the receptacle and rotating the receptacle at elevated speed to ensure interaction of liquid with powder while creating a gradient of pressure of liquid in the receptacle; such pressure increasing gradually from the centre towards the periphery of the receptacle. As liquid traverses the coffee bed, extraction of the coffee compounds takes place and a liquid extract is obtained that flows out at the periphery of the receptacle. 
         [0004]    The term “capsule” refers to any flexible, rigid or semi-rigid container containing beverage ingredient. Other synonymous to a capsule are: “pod”, “pad”, “cartridge” or “sachet”. The capsule can be single use. The container can also be filled with ingredient by the user to form the capsule just before use. 
         [0005]    The term ingredient means any suitable beverage substance such as ground coffee, soluble coffee, leaf tea, soluble tea, herbal tea, dairy powder, baby food, culinary powder and combination thereof. 
         [0006]    The invention relates more particularly to the identification of the capsule by means of a code. The code may be necessary to control parameters in the beverage preparation device such as liquid or beverage flow rate, pressure, rotational speed, temperature and combinations thereof. 
         [0007]    EP0451980 relates to packages containing comestibles for the preparation of beverages. Recognition means can comprise one or more strips of a magnetic material applied to the body of the package which can be read by an appropriate magnetic sensor, one or more shaped or divided areas of metal foil applied to the package body which cause an inductive effect on movement of the package in the machine, which inductive effect can be sensed; or one or more electrically conductive areas formed on the body of the package which can be sensed electrically. 
         [0008]    WO02/28241 relates to an encoded coffee packet for use in the preparation of hot or cold beverages comprising a filter defining a cavity and a brewing ingredient within the cavity. The packet further comprises a machine-interpretable feature located on the filter such as a color, a shape, a glyph, a text string, a barcode or a digital watermark. 
         [0009]    WO02/078498 relates to a machine-readable identifier on a portion package which contains ground coffee for espresso machine. The identifier can be a concentric barcode which is read when the capsule turns around an axis which is placed outside of its perimeter such as when the capsule is stored in a carousel. 
         [0010]    WO2005044067 relates to a system for identifying a capsule having a code visible under UV light printed thereon or a magnetic code such as a ribbon or label. The code may be read by a turning magnetic reading head. However, such system is not adapted for detecting a capsule in a device using centrifugal forces for extracting the beverage. 
         [0011]    WO2009007292 relates to a method for reading barcodes in a drinks machine when the brewing chamber is being closed from an open position to a closed position. 
         [0012]    WO2010/026053 relates to a controlled beverage production device using centrifugal forces. The capsule may comprise a barcode provided on an outside face of the capsule and which enables a detection of the type of capsule and/or the nature of ingredients provided within the capsule in order to apply a predefined extraction profile for the beverage to be prepared. 
         [0013]    A problem with identifying a capsule in a beverage preparation machine is that the retrieving or reading information from the capsule is not always reliable or convenient. The present invention brings a solution to this problem. 
       BRIEF DESCRIPTION OF THE INVENTION 
       [0014]    The aim of the present invention is to propose an improved way to identify the capsule within a beverage production machine to ensure a more reliable and convenient retrieval or reading of information so as to adjust working parameters of the machine. 
         [0015]    This aim is achieved by a capsule for the preparation of a beverage comprising a container and a beverage ingredient contained therein, wherein the container comprises a code adapted for being identified or read by external reading means, wherein the code is arranged on the container to be read while the capsule is rotated around an axis of rotation traversing the capsule. 
         [0016]    More particularly, the capsule has a circumference wherein the code is arranged on the container along an arc-shaped or circular path of the circumference. In a particular mode, the capsule has a circumference wherein the code comprises successive segments which are individually rectilinear but extend substantially along at least a part of the circumference. More particularly, the code is arranged along at least a eighth of the circumference. This configuration provides a reliable reading or retrieval of information as well as an effective portion for information. In order to ensure a reliable reading or retrieval of information, the code is repeated along said circumference. The repetition ensures a higher probability that at least one code is readable but also may potentially reduce the reading time. 
         [0017]    Preferably, the code is an optical code. The code may be a bit code formed by a series of discrete polygonal (e.g., rectangles or squares) or dot surfaces printed on the container and/or embossed in the container. 
         [0018]    The code may printed by a visible ink by human eyes under natural light or, alternatively, an ink which is not visible by human eyes under natural light (e.g., ink visible under UV). 
         [0019]    Preferably, the code is printed or embossed to form a pattern which possesses surfaces having different reflective and/or absorbing properties to light. In particular, the pattern possesses first surfaces and second surfaces having different reflective and/or absorbing properties to light. More particularly, the pattern possesses first surfaces inclined mirroring or absorbing properties to light and second surfaces having flat mirroring or flat reflective properties to light. 
         [0020]    In a possible mode, the code is mechanically embossed or engraved on the container by laser or by other means such as a press. 
         [0021]    In an embodiment, the container comprises a body and a lid connected to the body and wherein the code is present on the lid of the container. The lid may be a closed foil and/or a filter, for example. 
         [0022]    In another embodiment, the code is present on the rim of the capsule. In the most preferred embodiment, the code is present on the bottom of the rim of the capsule which is opposed to the lid of the capsule. The bottom of the rim is sufficiently away from the liquid injection and beverage delivery areas so that there is a lower risk for the code to become unreadable such if partly or totally hidden or soiled by beverage residues or otherwise (e.g., coffee particles). As a result, the reading is made more reliable. The reading may also be carried out while the capsule is in place in the beverage production device. Therefore, the preparation of the beverage is simplified and the preparation time can be reduced. 
         [0023]    The invention further relates to a system for preparing a beverage from a capsule as aforementioned and further comprising a beverage preparation device; wherein the device comprises capsule holding means for holding the capsule and rotational drive means for driving the holding means and capsule in rotation along said axis of rotation and reading means arranged for reading the code when the capsule is rotated along said axis. 
         [0024]    In particular, the reading means may comprise a light emitter and a light sensor. In an alternative, the reading means comprises an inductive sensor. The optical reading means or inductive sensor may be arranged to detect a code on the rim of the capsule. 
         [0025]    The invention further relates to a method for preparing a beverage from a system comprising a capsule as aforementioned and a beverage preparation device; wherein the device comprises capsule holding means for holding the capsule therein and rotational drive means for driving the holding means and capsule in rotation along said axis of rotation and reading means arranged for reading the code when the capsule is rotated along said axis. 
         [0026]    The invention is further described in the appended claims and the following detailed description. 
     
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         [0027]    The present invention will be better understood thanks to the detailed description which follows and the accompanying drawings, which are given as non-limiting examples of embodiments of the invention, namely: 
           [0028]      FIG. 1  illustrates the basic principle of the centrifugal extraction, 
           [0029]      FIG. 2  illustrates the reading method of a mark on the lid surface of the capsule, 
           [0030]      FIG. 3  illustrates the reading method of an absence of the mark, 
           [0031]      FIG. 4  illustrates an alternate position of the code on the capsule, in particular, when placed on the underside of the rim of the capsule, and the capsule fitted into a capsule holder of the extraction device, 
           [0032]      FIGS. 5 and 6  illustrate the combination of a laser source and a detector in positive and negative detection, for example, for the alternate position of the code of  FIG. 4 , 
           [0033]      FIG. 7  illustrates the detection of a color code on the capsule, for example, for the alternate position of the code of  FIG. 4 . 
       
    
    
     DETAILED DESCRIPTION 
       [0034]      FIG. 1  illustrates an example of a beverage preparation system  1  as described in WO2010/026053 for which the capsule of the invention can be used. 
         [0035]    The centrifugal unit  2  comprises a centrifugal cell  3 . The cell  3  may comprise a capsule holder and a capsule received therein. The centrifugal unit is connected to driving means  5  such as a rotary motor. The centrifugal unit comprises a collecting part and an outlet  35 . A receptacle  48  can be disposed below the outlet to collect the extracted beverage. The system further comprises liquid supply means such as a water reservoir  6  and a fluid circuit  4 . Heating means  31  may also be provided in the reservoir or along the fluid circuit. The liquid supply means may further comprise a pump  7  connected to the reservoir. A flow restriction means  19  is provided to create a restriction to the flow of the centrifuged liquid which leaves the capsule. The system may further comprise a flow meter such as a flow-metering turbine  8  for providing a control of the flow rate of water supplied in the cell  3 . The counter  11  can be connected to the flow-metering turbine  8  to enable an analysis of the generated impulse data  10 . The analysed data is then transferred to the processor  12 . Accordingly, the exact actual flow rate of the liquid within the fluid circuit  4  can be calculated in real-time. A user interface  13  may be provided to allow the user to input information that is transmitted to the control unit  9 . Further characteristics of the system can be found in WO2010/026053. 
         [0036]    In the following examples (see  FIG. 4 ), the capsule comprises a cup-shaped body  69  extending by a flange-like rim  73 . A lid such as a foil or membrane (liquid-tight or permeable to liquid)  60  is connected to the body, e.g., sealed on the rim. The capsule is filled with beverage ingredient such as ground coffee. 
         [0037]    The capsule is designed for rotating around an axis A. This axis A crosses perpendicularly the center of the membrane which has the form of a disk. This axis A exits at the center of the bottom of the body. This axis A will help to define the notion of “circumference” which is a circular path located on the capsule and having the axis A as reference axis. This circumference can be on the lid, e.g., membrane or on the body part such as on the flange-like rim. The lid may be impervious to liquid before insertion in the device or it may be pervious to liquid by means of small openings or pores provided in the center and/or periphery of the lid. The code is spread along the circumference or a part of the circumference. The code may comprise successive arch-shaped segments. The code may also comprise successive segments which are individually rectilinear but extend along at least a part of the circumference. According to one embodiment, the sensor cannot read the code without the rotation of the capsule. This is the case where the code is spread along at least a eighth, preferably at least a quarter of the circumference or even more. The fact that the code is placed along an arc-shaped line render the reading by a sweep beam very difficult. This is why the rotation of the capsule plays an important role. In case that the code is located on the body, it is then necessary to rotate the capsule to have access, for the sensor, to the entire set of marks composing the code. The code is further located close to the peripheral edge of the capsule. The peripheral edge is defined as the outermost circular line of the capsule. Preferably, the distance of the code from the peripheral edge is not more than 10 mm, more preferably not more than 8 mm. 
         [0038]    According to an embodiment, the code is printed by an ink which is not visible by human eyes under natural light (e.g., ink visible under UV). In this case, the sensor further comprises a UV-light beam source and a UV detector. 
         [0039]    The code is preferably repeated along the circumference in order to ensure a reliable reading. The code is repeated at least twice on the circumference. Preferably, the code is repeated three to six times on the circumference. Repetition of the code means that the same code is duplicated and the successive codes are positioned in series along the circumference so that upon a 360-degree rotation of the capsule, the same code can be detected or read more than one time. 
       EXAMPLES 
       [0040]    1) Optical Reading On Foil, Respectively On Top Side Rim Of Capsule ( FIGS. 2 and 3 ): 
         [0041]    A light beam is projected onto the capsule&#39;s lid, e.g., membrane or foil  60 , as illustrated on  FIG. 2 . 
         [0042]    Onto the capsule foil  60 , a plurality of bits forming the code  61  is applied along a circular or arc-shaped path. 
         [0043]    Preferably, the code is placed on a flat portion of the lid and close to the peripheral edge of the capsule. The code is preferably placed the lid that is supported by the flange-like rim of the capsule or overlaps with the rim. Hence, the code is not distorted due to mechanical constraints and can be read more reliably. 
         [0044]    The marks may consist of:
       Mirroring or absorbing surfaces for providing bit “ 0 ” and,   Diffusing and reflective surfaces for providing bit “ 1 ”       
 
         [0047]    The binary values “0” and “1” are arbitrary chosen and can be inversed. 
         [0048]    The code is read by rotating the capsule along a central axis A ( FIG. 1 ). 
         [0049]    The reader or sensor  62  is part of the centrifugal unit  2  and consists of
       A light source with or without focusing optic and   A light sensor with or without focusing optic.       
 
         [0052]    The light can be:
       Non polarized or   Polarized (laser) or   Spectrum: Any, but preferably infra red.       
 
         [0056]    The code can be applied on the capsule by:
       Printing (absorbing/reflecting+diffusing), visible, invisible or   Embossing (mirroring+rough reflecting+diffusing) or   Laser engraving.       
 
         [0060]    Optionally, the bit code may also consist of different color patterns combined with a color reading device. The combination of different colors and reading at a specific rotational speed results in a well defined “mixed color”. As an example, a capsule with half the circumference in blue and the other half in yellow would result in reading a green color during rotation. In the same manner, one third in blue and the remaining part in yellow will give another color. In this case, the light could be a simple light source without specific convergence means. 
         [0061]    As illustrated in  FIG. 2 , when the light beam  63 , sent by the light source of the sensor  62 , touches the mirror code pattern (small rectangles  65 ) it reflects in a reflective beam  64  which is not received by the sensor. 
         [0062]    As the capsule is rotated ( FIG. 3 ), the light beam  63  touches a diffuse reflecting surface (surface between the small rectangles) and is partially reflected to the sensor. A reflective beam  66  is received by the sensor whereas other beams  67 ,  68  are diffused or reflected outside the sensor. 
         [0063]    2) Optical Reading On Rim Bottom Side Of Capsule ( FIGS. 4 to 7 ): 
         [0064]    The capsule  7  may comprise a code  70  on the bottom side  72  of its rim  73 . The bit code is formed of a succession of small rectangular surfaces having light mirroring properties and intermediate surfaces having flat mirroring and/or diffusing properties. The surfaces are arranged in a circular pattern or an arc-shaped pattern at least along an angular portion of the rim. 
         [0065]    A light beam  74  is projected to the capsule&#39;s rim  73 . 
         [0066]    Onto the capsule rim, a bit code is applied along a circular or arc-shaped path of the rim. 
         [0067]    The bit code may consist of:
       Inclined mirroring or (flat) absorbing surfaces for bit “ 0 ” and   Flat mirroring or flat reflective (diffusing) surfaces for bit “ 1 ”       
 
         [0070]    The bit code is read by rotating the capsule along its central axis A. 
         [0071]    The reader may consist of
       A light source with/without focusing optic and,   A light sensor with/without focusing optic.       
 
         [0074]    The light can be:
       Non polarized or   Polarized (laser) or   Spectrum: Any, but preferably infra red.       
 
         [0078]    The code can be applied on the capsule by:
       Printing (absorbing/reflecting+diffusing), visible, invisible or,   Laser engraving (e.g. for absorbing/reflecting−diffusing) surfaces or,   Embossing: Flat and inclined mirroring surfaces.       
 
         [0082]    In the embodiment of the  FIG. 4 , the light source is placed at the bottom of the centrifugal cell  3 . This cell is light conductive allowing the beam to reach the bottom side  72  of its rim  73 . The reflected light is conducted by the transparent (or light conductive) centrifugal cell  3  to reach the sensor  62 . In case that the sensor  62  cannot be aligned with the transparent part of the centrifugal cell  3 , a mirror can be placed as illustrated in the  FIG. 4  to deflect the forward and backward beams. 
         [0083]    On  FIG. 5 , the light beam  74  from the light source “L” touches the mirror surface of the code (small rectangle  81 ) and is reflected into a reflective beam  76  to the sensor “S” with high intensity. A bit such as “ 0 ” or “ 1 ” is thereby provided to the control unit. 
         [0084]    On  FIG. 6 , the light beam  74  from the light source “L” touches diffusing or absorbing surfaces (surface  82  between two small rectangles). The light beam  77  that reaches the sensor S is of small intensity. Other beams such as beam  78  are diffused outside the sensor S due to the diffusing properties of the surface. 
         [0085]    In each configuration (e.g.,  FIGS. 5-6 ), a bit such as “ 1 ” or “ 0 ” is provided to the control unit. 
         [0086]    Therefore, the number of bits and their bit code depend on the number and specific arrangement of mirror surfaces (e.g. rectangles) and diffusing or absorbing surfaces (e.g., zones between the rectangles). The same sequence of bits forming a “code” can be repeated several times on the circumference of the rim. This repetition provides redundancy and more reliability to the reading. 
         [0087]    Optionally ( FIG. 7 ), the code comprises different color patterns combined with a color reading device. The combination of different colors and reading at a specific rotational speed results in a well defined “mixed color”. As an example, a capsule with half the “dots” in blue and the other half in yellow would result in reading a green color during rotation. 
         [0088]    3) Application Modes Of Codes Onto A Capsule 
         [0089]    The codes described in the previous examples can be applied by different methods onto a capsule such as by:
       Printing or mechanical deforming on a formed capsule or,   Printing or mechanical deforming on the capsule raw material (foil) before container forming or,   Printing on outer surface of a capsule container or,   Printing on the inner surface of a capsule container, using the curl as information support (Aluminum capsule technology).       
 
         [0094]    4) Inductive Code Reading: 
         [0095]    Another mode consists in sensing a code provided on a metallic surface of the capsule using an inductive sensor. The code is formed by reliefs or recesses in the metallic surface. For instance, the capsule comprises a circumferential metal rim which comprises a succession of discrete slots and/or bumps. When the capsule is rotated about its central axis, the rim is moved relative to the sensor such that the slots and/or bumps are detected. The code can be read on a time base of a CPU of the beverage preparation device. The maximum rotational speed to read the code depends on the used sensor and the internal CPU of the device. 
         [0096]    5) Other General Characteristics To All Embodiments: 
         [0097]    The speed for reading can, for instance, be comprised between 0.1 and 1000 rpm. 
         [0098]    When reading the code, liquid can already be fed in the capsule for providing a pre-wetting of the beverage ingredients. 
         [0099]    The code preferably comprises three sections, the synchronization section, the payload section and the verification section. The synchronization section serves for the synchronization purpose i.e. to inform the sensor when the code begins. Since the speed of the rotation of the capsule can vary, the synchronization is achieved through a known sequence of bits such as  0 , 1 , 0 , 1 . Then the payload of the code identifying the capsule can be read. In order to avoid misinterpretation of the code, the payload can be followed by verification bits. These bits can be a checksum on the payload or a similar verification function. 
         [0100]    The code can be replicated along the code path so that if one code gives a wrong verification value, the other code(s) can be taken into account.