Patent Publication Number: US-2022225837-A1

Title: Blender

Description:
TECHNICAL FIELD 
     The present disclosure relates to a blender and, more particularly, to a blender including a transparent film capable of transmitting an electric signal, and thus detecting whether or not a container lid is attached. 
     BACKGROUND 
     Generally, a blender is also referred to as a mixer. The blender is used primarily to chop food accommodated in a container body into small pieces or mix the food by rotating a blade by a rotational force generated by a motor. 
     In a normal blender, a main body into which a motor operating by electricity is built is positioned below, and a container body in which the food is accommodated is seated on the top of the main body. A blade for chopping the food into small pieces or mixing the food is provided inside the container body and is rotated by a rotational force generated by the motor. 
     After the food that needs to be chopped into small pieces is put into the container body, an operational button or a knob of the main body is used to drive the motor. The blade is rotated by the rotational force generated by the motor, and thus the food inside the container body is chopped into small pieces or mixed. 
     In recent years, various blenders of this type have been developed to satisfy the user&#39;s need for food intake in their busy everyday life. For example, small-sized hand-held blenders or large-sized high-volume blenders have been developed, and blenders capable of chopping food at a high speed have also been developed. 
     In addition, vacuum blenders capable of slicing or grinding food accommodated in a container body under vacuum for foodstuff processing in a fresher state have been available on the market. 
     However, safety use, as well as the taste and nutrition of blender-chopped food, is of increasing importance for various types of blenders. That is, when a blade is rotated in a state where a container lid is not attached, the food accommodated inside a container body may be spill out to the outside. Furthermore, there is a concern in that safety-related accidents will occur. For example, a child may put their hand into the container lid. 
     Therefore, technologies for detecting whether or not the container lid is attached have been developed and disclosed. 
     For example, in U.S. Pat. Nos. 6,910,800 and 7,871,196, it is disclosed that a push pod which physically connects a container body and a main body is mounted and that a container lid, when attached on the container body, is pressed against the push rod. 
     Specifically, in U.S. Pat. No. 6,910,800, a link is formed along a flank surface of a container body in a manner that extends a long distance in the upward-downward direction. When a container lid above is attached, a protrusion thereon is pressed downward against an upper end portion of the link, and thus the lower end portion thereof is moved downward. In this manner, it is mechanically detected whether or not the container lid of the container body is attached. 
     In addition, in U.S. Pat. No. 7,871,196, instead of being provided in the flank surface of the container body, the link enabling the container lid to be attached in the upward-downward direction is provided inside a handle of the container body. That is, the push rod mounted in a manner that extends longitudinally in the upward-downward direction is mounted in a groove inside the handle. When the container lid is attached, the push rod is moved from upward to downward. Thus, a lower switch provided below is activated by the push rod and detects the container lid. 
     However, in U.S. Pat. No. 7,871,196, a separate push member, a push block, or the like needs to be mounted, and the link or the push rod that is formed in a manner that extends longitudinally in the upward-downward direction needs to be mounted according to its length. Thus, the link and the push are difficult to manufacture and mount. A detecting function may not perform because of wear and tear on or damage to the link and the push rod that results from the frequent use thereof. Furthermore, twisting, bending, or the like of the link or the push rod having a great length causes a failure to perform the detecting function. 
     The push member or a push detection unit needs to be separately mounted. Water may permeate into the push detection unit. The push detection may be contaminated with food. The push member of the container body and the push detection unit of the main body need to be mounted at positions, respectively, that correspond to each other, and thus the container body needs to be mounted in a specific direction. 
     In a related art, in a connection structure where a signal is transmitted in the upward-downward direction using a mechanical structure (or an electric wire), the container body is formed in a transparent or semi-transparent manner. In this case, at least one portion of the container body needs to be formed in an opaque manner so that a transmission mechanism or the electric wire is invisible from the outside. Thus, the degree of freedom in blender design is limited. 
     In addition, in a case where the mechanical structure (or the electric wire) is used, residues or a foreign material accumulates at a gap between a portion that the mechanical structure is attached to or detached from and the mechanical structure. Thus, contamination or leakage may occur. 
     In the related art, because a signal transmission mechanism is mounted in the handle, a structure of the handle is complex, and a structure needs to be mounted in a small space in the narrow handle. Thus, the structure is difficult to mount and to repair when malfunctioning. Furthermore, a signal transmission structure needs to be connected in the upward-downward direction through the handle. Accordingly, upper and lower end portions of the handle are always attached on the container body. Thus, the degree of freedom in blender design is limited. 
     In order to solve these problems, EPO Patent No.2548485 discloses a blender of which a main body recognizes attaching of a container lid on a container body using a wireless communication module when the container lid is attached on the container body. 
     However, in EPO Patent No.2548485, the wireless communication module needs to be provided between the container body and the main body. Furthermore, a separate power supply (a battery or a dry cell) for driving the wireless communication module needs to be provided in the container body. 
     Moreover, an error due to a communication traffic jam resulting from a plurality of communication channels may occur. That is, wireless power transfer or wireless communication also needs to be performed between the man body and an external power supply device (a cooktop or the like). In addition, a signal indicating whether or not the container lid is attached needs to be wirelessly transmitted between the container body and the main body. Thus, the communication traffic jam may occur. 
     In order to solve these problems in the related art, US Patent Application Publication No.20180020875 discloses an interlocking blending device. In the interlocking blending device, a transmission coil and a reception coil that constitute a pair is arranged in a main body, and a reception coil and a transmission coil that constitute a pair is correspondingly arranged in a container body. When a container lid is attached on the container body, electric power is transferred to the reception coil of the container body through the transmission coil of the main body. The electric power is transferred back to the reception coil of the main body through the transmission coil of the container body. Thus, the main body recognizes that a container lid is attached on the container body. 
     That is, US Patent Application Publication No.20180020875 discloses in the following structure. A push rod is mounted in the upward-downward direction along a flank surface of the container body, and a container-lid detection signal is mechanically transferred to under the container body. In addition, a circuit connected up to a lower portion of the container is open or closed according to whether a switch above a container turns on or off by the container lid. Accordingly, signal transmission is allowed or disabled. 
     However, in US Patent Application Publication No.20180020875, two coils, that is, the transmission coil and the reception coil need to be mounted in each of the main body and the container body. A device analyzing electric power received by the reception coil of the main body needs to be provided. 
     In addition, because two coils are arranged in each of the main body and the container body, in a case where electric current flows through each of the coils, a change in induced current occurs due to interference between magnetic fields developing at the coils. Thus, electric power received by the reception coil of the main body is also difficult to analyze precisely. 
     The transmission coil of the main body transfers electric power to the reception coil of the container body, and when the container lid is attached, the electric power is transferred from the transmission coil of the container body to the reception coil of the main body. Thus, in order for the reception coil of the main body to receive electric power indicating meaningful data, the transmission coil of the main body needs to transfer high electric power to the reception coil of the container body. 
     Moreover, for connection of the two switches in an upper end portion of the container body and transfer of an electric signal between the upper end portion and a lower end portion of the container body, a connection wire is mounted in such a manner as to connect a circumference edge of the upper end portion of the container body and the upper and lower end portions of the container body. 
     Therefore, since the connection wire is mounted on the circumference edge of the upper end portion of the container body or is mounted in the upward-downward direction on the flank surface of the container body, an exterior appearance of the container body made of a transparent material may be spoiled. That is, the connection wire for transmitting an electric signal is mounted to a surface of the container body and may be broken off due to interference, or the colored mounting connection wire mounted on the transparent container body may spoil a blender design. 
     In US Patent Application Publication No.20180020875, the container lid is a single component. Thus, in a case where food or the like is put into the container body, the entire container lid is inconveniently detached. A handle is formed of a single material or is made of the same material as the container body. Thus, a user gets the impression of a crude or coarse image of an upper surface of the main body. 
     In addition, the container body and the main body are separated and then are brought into contact with each other. Accordingly, a foreign material may be introduced through a gap between the container body and the main body, and thus electric power transfer or signal transmission may not be properly performed. 
     The container body is frequently detached from the main body for use, and thus components on an upper surface of the main body may be damaged due to introduction of foreign material or physical shock. 
     SUMMARY 
     An objective of the present disclosure, which is made to solve the problems in the related art as described above, is to provide a blender including a main body to which a signal indicating detection of attaching of a container lid on a container body is electrically transmitted. 
     Another objective of the present disclosure is to provide a blender capable of preventing a detection error due to a foreign material, such as water or food, or preventing contamination with the foreign material. 
     Still another objective of the present disclosure is to provide a blender including a container body in which a component for transmitting a signal or transferring electric power is blocked from contacting with the outside. 
     Still another objective of the present disclosure is to provide a blender capable of preventing an external foreign material from permeating into a main body or preventing a component from being damaged due to the external foreign material when a container body is attached or detached to and from the main body. 
     Still another objective of the present disclosure is to provide a blender including a main body and a container body between which a signal is transmitted without a communication traffic jam. 
     Technical Solution 
     According to an aspect of the present disclosure, there is provided a blender including a detection system that, with an electric signal, detects whether or not a container lid is mounted. 
     In the blender, a seating support is formed on an upper surface of a main body in a manner that protrudes upward therefrom to be stepped, a bottom surface of a container body being seated on the seating support. Therefore, the container body that is seated on the main body is prevented from being moved forward, backward, leftward, and rightward. Thus, food is easily chopped into small pieces. 
     In the blender, one or more components for transferring and receiving electric power or transmitting and receiving a signal between the main body and the container body may be mounted on an upper surface of the main body. The tops of these components are covered by covers, respectively. Therefore, the components are prevented from being damaged or malfunctioning due to an external foreign material. 
     In the blender, the cover covering the upper surface of the main body may be made of a material capable of transmitting light or a signal. Therefore, a container-lid detection signal generated in the container body is transmitted to the main body without a communication traffic jam. 
     In the blender, an exterior material may be further provided on an external surface of the seating support formed on the upper surface of the main body. Therefore, in a case where the container body is separated from the main body, a customer gets an aesthetic impression of a stylish image of the upper surface of the main body. 
     In the blender, an elastic member may be provided on the seating support protruding toward the upper surface of the main body and supporting a bottom surface of the container body. Therefore, a collision between the main body and the container body is prevented. Thus, the blender is prevented from being damaged, and noise is reduced. 
     In the blender, the seating support may include a lower rim and an upper rim. The lower rim has a diameter corresponding to a diameter of a lower end portion of the container body. The upper rim is formed in such a manner as to protrude upward from the lower rim and has a smaller diameter than the lower rim. 
     In the blender, a step surface in parallel with the upper surface of the main body may be formed between the lower rim and the upper rim. 
     In the blender, an elastic member made of an elastic material may be further provided on the step surface. 
     In the blender, the elastic member may be made of conductivity rubber. 
     In the blender, an electric power transmission unit configured to supply electric power to the container body and an optical reception module configured to receive light may be mounted on an upper surface of the upper rim. 
     In the blender, as the optical reception module, an optical sensor receiving light and converting the received light into an electric signal may be used. 
     In the blender, as the electric power transmission unit, an induction coil where an induced electromotive force is able to occur may be used. 
     In the blender, the electric power transmission unit and the optical reception module may be mounted on the upper surface of the upper rim in such a manner as to be spaced apart in opposite directions from each other. 
     In the blender, the electric power transmission unit and the optical reception module may be mounted on one portion of the upper surface of the upper rim in a manner that is in proximity to each other. 
     In the blender, an exterior ring and an upper end ring may be provided on external surfaces, respectively, of the lower rim and the upper rim. The exterior ring and an upper end ring have shapes corresponding to shapes, respectively, of the external surfaces of the lower rim and the upper rim. 
     In the blender, the exterior ring and the upper end ring may be made of a stainless steel material. Therefore, an exterior appearance of the upper surface of the main body provides a sense of solidarity and a sense of improved texture. 
     In the blender, the cover may include a circular cover edge and a plurality of cover portions that are integrally formed with the cover edge and cover a plurality of components, respectively. 
     In the blender, upper surfaces of the cover portions may be formed in such a manner as to protrude upward above an upper surface of the cover edge. 
     In the blender, a circular rim protruding downward may be formed on a center portion of the bottom surface of the container body, and a circular-rim accommodation groove may be formed in a center portion of the upper rim in a manner that is cut downward. The circular rim is accommodated in the circular-rim accommodation groove. 
     In the blender, the circular rim may have the shape of a circular ring and may be open at the center. Thus, the circular rim provides a path through which a blade assembly and a motor assembly are connected to each other. 
     In the blender, a plurality of mounting protrusions that protrude radially may be further provided on an outer circumferential surface of the circular rim. One or more portions of a protrusion groove may be recessed outward, and thus one or more circular-rim accommodation grooves may be radially formed. The mounting protrusion is seated in the circular-rim accommodation groove. With this configuration, the container body is firmly mounted at its original position on the upper surface of the main body. 
     Advantageous Effects 
     A blender according to the present disclosure provides the following effects. 
     Firstly, according to the present disclosure, with a configuration where an electric circuit formed on a container body is turned on or off according to whether or not a container lid is attached, the container lid is electrically detected. Therefore, there is provided an advantage in that, when compared with mechanical detection in the related art, the container lid is prevented from being damaged due to wear and tear while in use for a long time and in that precise detection is possible. 
     Secondly, according to the present disclosure, a seating support is formed on an upper surface in a manner that protrudes upward to be stepped, a bottom of the container body is seated on the seating support. Therefore, there is provided an advantage in that, when compared with a case where the seating support is in the same plane as the main body or is a groove, handling of the container body is facilitated. 
     Thirdly, according to the present disclosure, one or more components for transferring and receiving electric power or transmitting and receiving a signal between the main body and the container body are mounted on the upper surface of the main body. The tops of these components are covered by covers, respectively. Therefore, there is provided an advantage in that the component on the upper surface of the main body is prevented from being damaged or malfunctioning due to an external foreign material in a case where the container body is separated from the main body. 
     Fourthly, according to the present disclosure, the cover covering the upper surface of the main body is made of a material capable of transmitting light or a signal. Therefore, the effect of transmitting a container-lid detection signal generated in the container body to the main body without a communication traffic jam is achieved. 
     Fifthly, according to the present disclosure, an exterior material may be further provided on an external surface of the seating support formed on the upper surface of the main body. Therefore, there is provided an advantage in that in a case where the container body is separated from the main body, a user gets an aesthetic impression of a stylish image of the upper surface of the main body. 
     Sixthly, according to the present disclosure, an elastic member is provided on the seating support protruding toward the upper surface of the main body and supporting a bottom surface of the container body. Therefore, an elastic member having elasticity that is provided between the upper surface of the main body and the container body serves to absorb shock. Thus, there is provided an advantage in that a collision between the container body and the main body is prevented, thereby preventing damage to the blender and noise. 
     Seventhly, according to the present disclosure, an electric power transmission unit configured to supply electric power to the container body and an optical reception module configured to receive light are mounted on an upper surface of an upper rim of the main body. The electric power transmission unit and optical reception module are mounted on the upper surface of the upper rim in such a manner as to be spaced apart in opposite directions from each other or are mounted on one portion of the upper surface of the upper rim in a manner that is in proximity to each other. Therefore, there is provided an advantage in that a narrow space where the container body and the main body are combined with each other is easily utilized, thereby realizing a compact blender. 
     Eighthly, according to the present disclosure, a protrusion and a groove are formed on the upper surface of the main body and in a bottom surface of the container body, respectively, in such a manner that shapes of the upper surface and the bottom surface correspond to each other. Therefore, there is provided an advantage in that the container body is precisely mounted at its original position on the man body, thereby preventing rotation and movement thereof. 
     Ninthly, according to the present disclosure, a cover rib is further formed on the cover covering the upper surface of the main body in a manner that protrudes downward therefrom. The cover is pressed against an edge of an upper end ring. Therefore, there is provided an advantage in that the cover is easily mounted and separated, thereby improving the workability. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a blender according to a desired embodiment of the present disclosure; 
         FIG. 2  is a longitudinal cross-sectional view illustrating an internal configuration of the blender according to the embodiment of the present disclosure; 
         FIG. 3  is an exploded perspective view illustrating a detailed configuration of a container body that constitutes the blender according to an embodiment of the present disclosure; 
         FIG. 4  is a perspective view illustrating a configuration of an outer container body that constitutes the blender according to an embodiment of the present disclosure; 
         FIG. 5  is a partial cross-sectional view illustrating a detailed configuration of a film guide on the outer container body that constitutes the blender according to the embodiment of the present disclosure; 
         FIG. 6  is a perspective view illustrating a detailed configuration of a reed switch that constitutes the blender according to an embodiment of the present disclosure; 
         FIG. 7  is a partial cross-sectional view illustrating a state where the reed switch that constitutes the blender according to the embodiment of the present disclosure is mounted; 
         FIG. 8  is a perspective view illustrating a configuration of a coil holder that constitutes the blender according to an embodiment of the present disclosure, when viewed from above; 
         FIG. 9  is a perspective view illustrating the configuration of the coil holder that constitutes the blender according to the embodiment of the present disclosure, when viewed from below; 
         FIG. 10  is an exploded perspective view illustrating a detailed configuration of a coil holder assembly that constitutes the blender according to the embodiment of the present disclosure, when viewed from above; 
         FIG. 11  is an exploded perspective view illustrating the detailed configuration of the coil holder assembly that constitutes the blender according to the embodiment of the present disclosure, when viewed from below; 
         FIG. 12  is a perspective view illustrating a container lid that constitutes the blender according to an embodiment of the present disclosure; 
         FIG. 13  is a cross-sectional perspective view illustrating the container lid that constitutes the blender according to the embodiment of the present disclosure; 
         FIG. 14  is an exploded perspective view illustrating the container lid that constitutes the blender according to the embodiment of the present disclosure; 
         FIG. 15  is an exploded cross-sectional perspective view illustrating the container lid that constitutes the blender according to the embodiment of the present disclosure; 
         FIG. 16  is a perspective view illustrating a container body that constitutes the blender according to an embodiment of the present disclosure, when viewed from below; 
         FIG. 17  is a perspective view illustrating a main body that constitutes the blender according to an embodiment of the present disclosure; 
         FIG. 18  is an exploded perspective view illustrating components in the upper half of the main body that constitutes the blender according to the embodiment of the present disclosure; 
         FIG. 19  is a perspective view illustrating a state where a cover is removed from the main body that constitutes the blender according to the embodiment of the present disclosure; 
         FIG. 20  is a perspective view illustrating a detailed configuration of the cover that constitutes the blender according to the embodiment of the present disclosure; 
         FIG. 21  is a perspective view illustrating a detailed configuration of a curvature piece of an upper end ring that constitutes the blender according to the embodiment of the present disclosure; 
         FIG. 22  is a perspective view illustrating an implementation example of the electric power transmission unit that constitutes the blender according to the embodiment of the present disclosure; 
         FIG. 23  is an exploded perspective view illustrating an arrangement of an electric power transmission unit and a coil holder in relation to each other; and 
         FIG. 24  is a front exploded view illustrating the arrangement of the electric power transmission unit and the coil holder in relation to each other; 
     
    
    
     DETAILED DESCRIPTION 
     A blender according to the present disclosure will be described in detail below with reference to the accompanying drawings. 
       FIG. 1  is a perspective view illustrating a blender according to an embodiment of the present disclosure.  FIG. 2  is a longitudinal cross-sectional view illustrating the blender to the embodiment of the present disclosure. 
     As illustrated in  FIGS. 1 and 2 , the blender according to the present disclosure is configured to include a container body  100 , a main body  500 , and the like. The container body  100  is positioned at a relatively great height and accommodates food. The main body  500  is provided underneath the container body  100  and supports the container body  100 . 
     The food is accommodated to the container body  100  and is chopped into pieces or mixed there. The main body  500  supports the container body  100 . A plurality of components that control food chopping and mixing in the container body  100 , supply electric power, and perform other functions is provided inside the main body  500 . 
     It is desirable that the entire container body  100  has the shape of a cylinder when viewed as a whole. The container body  100  is configured to be open at the top. Thus, the food may be inserted into and taken out of the container body  100 . 
     It is desirable that the container body  100  is made of a transparent material in such a manner that the inside thereof may be viewed from the outside. That is, the container body  100  is made of glass or transparent plastic in such a manner that a user may visually check a state of the food inside the container body  100  from the outside. 
     A blade assembly  200  is mounted on the inside bottom of the container body  100 . A plurality of blades is rotatably mounted in the blade assembly  200  and chops the food accommodated in the container body  100  into small pieces or mix the food. 
     The blade assembly  200  is configured in such a manner as to be connected to the motor assembly  600  described below and to be rotatable by a rotational force generated by the motor assembly  600 . 
     It is desirable that the wall and the bottom of the container body  100  are formed in a double-layered manner. That is, the container body  100  is configured to include an outer container body  110  that provides an exterior appearance of the container body  100  and an inner container body  120  that is positioned inward from the outer container body  110 . 
     In a case where the outer container body  110  and the inner container body  120  are configured in such a manner as to be brought into contact with each other or in such a manner as to be spaced apart from each other, it is also possible that the outer container body  110  and the inner container body  120  are mounted in such a manner as to be partly brought into contact with each other. 
     One or more inner guides  122  that have a predetermined length in an upward-downward direction are provided inside the container body  100 . The inner guide  122  serves to guide rotating of the food inside the container body  100 . It is desirable that the inner guides  122  are symmetrically arranged in each pair in the forward-backward direction or in the leftward-rightward direction. 
     A handle  300  that is to be gripped with the user&#39;s hand is formed on a right-side surface of the container body  100  in a manner that protrudes rightward. It is desirable that the handle  300  is formed in such a manner that the user holds the handle  300  with their hand. According to the present disclosure, an example is illustrated where an upper end portion of the handle  300  is formed integrally with and is configured in such a manner as to be integrally combined with an upper end portion of an external surface of the container body  100 . 
     A projection lip  210  is further formed on the upper portion of the external surface of the container body  100  in a manner that is opposite to the handle  300 . 
     The projection lip  210 , as illustrated, is formed on an upper end portion of the left side of the container body  100  and serves to guide discharging of the small pieces of the food inside the container body  100  in an easy manner to the outside. Therefore, it is desirable that the projection lip  210  is formed in such a manner that the nearer an upper end of the projection lip  210  is to the upper surface of the container body  100 , the more the upper end thereof protrudes in the leftward direction. 
     The top of the container body  100  is covered by a container lid  400 . That is, the container lid  400  is detachably mounted on the upper surface of the container body  100 , and thus closes or opens the top of the container body  100 . 
     The container lid  400  covers the top of the container body  100  in such a manner that the food does not get out of the container body  100  to the outside, and blocks an outside foreign material from being introduced into the container body  100 . 
     The container lid  400  is configured in such a manner as to be attached on the upper surface of the container body  100  by the user pressing or rotating the container lid  400 . A gasket  402  is further provided on an outer circumferential surface of the container lid  400  and bridges a gap between the container lid  400  and the container body  100 . Of course, the gasket  402  also serves to press the container lid  400  against the upper surface of the container body  100 , and thus hold the container lid  400  firmly in place. 
     A cap  450  is further provided on the container lid  400 . That is, a cover hole  401  that is a circular hole of a predetermined size is formed in a center portion of the container lid  400  in a manner that passes through the center portion thereof from top to bottom. The cap  450  is inserted into the cover hole  401  and plugs the cover hole  401 . 
     The cap  450 , as illustrated, is mounted on the center portion of the container lid  400 . The cap  450  is formed in such a manner as to have a smaller diameter than the container lid  400  when viewed as a whole. It is desirable that the cap  450  is detachably mounted on the container lid  400  by forcefully inserting the cap  450  thereinto or by rotating the cap  450 . 
     According to the present disclosure, an example is illustrated where the cap  450  is detachably mounted on the container lid  400  by rotating the cap  450 . A detailed configuration of the cap  450  is described as follows. 
     The cap  450  is detachably mounted on the container lid  400 . Thus, the user may observe the food inside the container body  100  without the need to detach the container lid  400  in a state where only the cap  450  is detached from the container lid  400 . After the cap  450  is detached, it is also possible that the food is inserted into the container body  100  or that the food inside the container body  100  is mixed using a rod or the like. 
     An upper end portion of the cap  450  is formed in such a manner as to protrude more upward than an upper end portion of the container lid  400 . Thus, the upper end portion thereof may also serve as a container lid handle that is to be gripped by the user&#39;s hand when attaching or detaching the container lid  400 . 
     As illustrated, the main body  500  is formed in such a manner as to have the shape of a parallelepiped when viewed as a whole. The main body  500  is provided underneath the container body  100  and supports the container body  100 . A plurality of components including electronic components, such as the motor assembly  600  and a printed circuit board (PCB), is mounted inside the main body  500 . Of course, the main body  500  may have an exterior appearance that can vary widely whenever necessary. 
     The motor assembly  600  is positioned inside a center portion of the main body  500 . The motor assembly  600  is supplied with electric power from the outside, and thus generates a rotational force. The blades constituting the blade assembly  200  are rotated by the generated rotational force. 
     Therefore, it is desirable that a lower end of the blade assembly  200  is connected to an upper end portion of the motor assembly  600 . 
     A knob  502  is formed on a front surface of the main body  500  in a manner that protrudes forward. The knob  502  serves to set the blender according to the present disclosure in operation. It is desirable that the knob  502  is rotatably mounted on the main body  500 . 
     The knob  502  may also be configured in such a manner as to control a rotational speed of the motor assembly  600 . That is, the knob  502  may be configured in such a manner that clockwise or counterclockwise rotation thereof changes the rotational speed of the motor assembly  600  from high to low or from low to high. 
     A touch operation unit  504  is provided on an upper surface of the main body  500 . 
     The touch operation unit  504  serves to operate the blender according to the present disclosure via contact. It is desirable that the touch operation unit  504  is configured in such a manner as to perform operations, such as starting the blender and stopping the blender. 
     Of course, the knob  502  and the touch operation unit  504  may be configured in such a manner as to selectively perform a function of setting the blender and a function of operating the blender or in such a manner as to perform these two functions individually. That is, for convenience, according to the user&#39;s selection, one of the knob  502  and the touch operation unit  504  may be configured in such a manner as to perform the function of operating the blender or the function of setting the blender. 
     A display unit  506  is further provided adjacent to the touch operation unit  504  (to the left side of the touch operation unit  504  in  FIG. 1 ). That is, the display unit  506  is further provided on the upper surface of the main body  500 . The display unit  506  serves to display an operating state of the blender in such a manner as to be viewed by the user from the outside. Therefore, it is desirable that the display unit  506  is configured as a seven-segment display. 
     A cooling fan  610  is further provided below the motor assembly  600 . 
     The cooling fan  610  is connected to a lower end portion of the motor assembly  600 , and thus is rotated by the rotational force generated by the motor assembly  600 . 
     Accordingly, outside air is forced to be introduced into the main body  500 . In this manner, the cooling fan  610  introduces the air into the main body  500  from the outside. Thus, the cooling fan  610  serves to cool components, such as a PCB, that are provided inside the main body  500 . 
     A base support  510  is further provided on a lower surface of the main body  500 . 
     The base support  510  is formed in such a manner as to protrude downward from a bottom surface of the main body  500 . A space of a predetermined size is formed inside the base support  510 . A wireless electric power module  520  is accommodated in this space. The wireless electric power module  520  is supplied with electric power from the outside in a wireless manner that uses an induced electromotive force and serves to supply the electric power to the motor assembly  600  inside the main body  500 . 
     A detection system is further provided in the main body  500 , the container body  100 , and the like. The detection system detects whether or not the container lid  400  is attached on the upper surface of the container body  100 . A detection system is further provided in the main body  500  or the container body  100 . The detection system detects whether or not the container lid  400  is attached on the upper surface of the container body  100 . 
     The detection system may be provided in at least one of the main body  500  and the container body  100 . That is, it is possible that the detection system is provided in a manner that corresponds to the main body  500  and the container body  100  or that the detection is provided in only one of the main boy  500  and the container body  100 . 
     An electric circuit (not illustrated) capable of being turned on and off is provided on the container body  100 . The electric circuit forms a closed circuit. Thus, it is desirable that the detection system is configured in such a manner as to detect whether electric current flows through the closed circuit by a voltage supplied from the main body  500 . 
     More specifically, the detection system is configured to include an electric power transmission unit  700 , an electric power reception unit  220 , an opening and closing unit  230 , a transparent electrode film  240 , a detection unit  800 , and the like. The electric power transmission unit  700  is provided in the main body  500  and supplies electric power to the container body  100 . The electric power reception unit  220  is provided in the container body  100  and receives the electric power supplied from the electric power transmission unit  700 . The opening and closing unit  230  is provided on an upper end portion of the container body  100  and opens and closes an electric circuit formed in the container body  100  according to whether or not the lid  400  covers the top of the container body  100 . The transparent electrode film  240  is made of a transparent material and is provided on one surface of the container body  100 . The transparent electrode film  240  is connected to the electric power reception unit  220  and the opening and closing unit  230  in a manner that allows electricity to flow therebetween. The detection unit  800  is provided on one side of the main body  500  or the container body  100  and detects whether or not electric current flows through a closed circuit formed by the electric circuit connected to the electric power reception unit  220  and the opening and closing unit  230 . 
     The electric power transmission unit  700  serves to transfer the electric power supplied to the main body  500  from the outside of the main body  500  or the electric power pre-stored in the main body  500  itself to the container body  100 . It is desirable that an induction coil or the like where an induced electromotive force can occur is used as the electric power transmission unit  700 . 
     The electric power reception unit  220  serves to receive the electric power transmitted from the main body  500  and has a structure corresponding to that of the electric power transmission unit  700 . That is, it is desirable that the electric power reception unit  220  is configured as a coil in such a manner that, by the induced electromotive force, the electric power is transferred between the electric power transmission unit  700  and the electric power reception unit  220 . 
     It is desirable that the electric power transmission unit  700  and the electric power reception unit  220  are positioned adjacent to each other in such a manner as to generate the induced electromotive force. Therefore, according to the present disclosure, a case is illustrated where the electric power transmission unit  700  is mounted on an upper right end portion of the container body  100  and where the electric power reception unit  220  is mounted on a lower right end portion of the container body  100 . 
     The turning-on and -off unit  230  serves to turn on and turn off the electric circuit (not illustrated) formed in the container body  100  according to whether or not the container lid  400  covers the top of the container body  100 . The turning-on and -off unit  230  is configured to include a permanent magnet  232 , and a reed switch  234  that are provided in the container lid  400  and the container body  100 , respectively, and the like. 
     As illustrated in  FIG. 2 , according to the present disclosure, a case is illustrated where the permanent magnet  232  is mounted on a right edge of the container lid  400  and where the reed switch  234  is mounted on the upper end portion (a portion of the handle  300 ) of the container body  100 . 
     More specifically, it is desirable that the reed switch  234  is mounted in such a manner as to be accommodated in a switch groove  236  formed in the upper end portion of the handle  300 . 
     The reed switch consists of a pair of ferromagnetic flexible metal contacts in a hermetically sealed glass envelope. The contacts are open when a magnetic field is applied. The configuration of the reed switch is well known in the related art. Therefore, a further detailed description of the configuration and principle of the reed switch is omitted. 
     Of course, instead of the permanent magnet  232  and the reed switch  234 , it is also possible that a different electric turning-on and -off unit or a mechanical structure is used, as the turning-on and -off unit  230 , to turn on and off the electric circuit. It is also possible that the permanent magnet  232  and the reed switch  234  are mounted on the container lid  400  and the container body  100 , respectively. 
     Various types of electric devices, various types of structures, or the like, if they have a function of being able to detect whether or not electric current flows by the turning-on and -off unit  230  through the electric circuit formed in the container body  100 , may be used as the detection unit  800 . According to the present disclosure, the detection unit  800  is described by taking, as an example, detection of light that uses a photosensor or photodetector. 
     Therefore the detection unit  800  is configured to include an optical transmission module  810 , an optical reception module  820 , and the like. The optical transmission module  810  is provided in the container body  100  and generates light. The optical reception module  820  is provided in the main body  500  and receives the light transmitted by the optical transmission module  810 . 
     It is desirable that the optical transmission module  810  and the optical reception module  820  are positioned adjacent to each other. According to the present disclosure, as illustrated, the optical transmission module  810  is positioned on a lower left end portion of the container body  100 , and the optical reception module  820  is positioned on an upper left end portion of the main body  500 . 
     It is desirable that a light emitting diode (LED) or the like that generates light using electricity is used as the optical transmission module  810 . It is desirable that a photosensor, a photodetector, or the like that receives light and converts the received light into an electric signal is used as the optical reception module  820 . 
     Then, the transparent electrode film  240  is provided between the outer container body  110  and the inner container body  120 . More specifically, it is desirable that the transparent electrode film  240  is mounted on an internal surface of the outer container body  110 . 
     The transparent electrode film  240 , as a conductive member, is made of a transparent material, such as indium-tin oxide (ITO), and is attached on a surface of the container body  100 . The turning-on and -off unit  230  provided on the upper end portion of the container body  100  is also connected to the electric power reception unit  220  and the optical transmission module  810 , which are provided on a lower end portion of the container body  100 , thereby constituting the electric circuit. 
     In this manner, the transparent electrode film  240  is attached on the surface of the container body  100  made of a transparent material in a manner that extends longitudinally in the upward-downward direction. Thus, the transparent electrode film  240  serves to guide transfer of an electric signal between upper and lower end portions of the container body  100 . 
     When the container body  100  and the transparent electrode film  240  are both made of a transparent material, the transparent electrode film  240  is not visually exposed to the outside. Thus, the transparent electrode film  240  does not spoil the exterior appearance of the container body  100 , and a design of the container body  100  is maintained as is. 
     Then, in a case where the transparent electrode film  240  is attached on the surface of the container body  100 , a hole may be formed in the transparent electrode film  240 . The hole serves to remove a bubble occurring between the transparent electrode film  240  and the surface of the container body  100  on which the transparent electrode film  240  is attached. That is, in order to prevent the bubble from occurring, it is desirable that a hole is drilled through a center portion of the transparent electrode film  240  made of ITO in such a manner that the bubble escapes therethrough. 
     A seating support  900  is formed on the upper surface of the main body  500  in such a manner as to protrude upward therefrom. 
     The seating support  900  is formed to a circular shape that corresponds to a shape of the lower end portion of the container body  100 . The lower end portion of the container body  100  is seated in the upward-downward direction on the seating support  900  in a manner that is removable therefrom. 
     The container body  100  is formed in a double-layered layer. That is, the container body  100  is configured to include the outer container body  110  and the inner container body  120 . It is desirable that the inner guide  122  is formed in such a manner as to protrude inward from an internal surface of the inner container body  120 . 
     A configuration of the container body  100  will be described in detail below. 
       FIGS. 3 to 15  are views each illustrating in detail a configuration of each of the container body  100  and the container lid  400 . That is,  FIG. 3  is an exploded perspective view illustrating the container body  100 .  FIG. 4  is a perspective view illustrating a configuration of an outer container body  110  that constitutes the blender according to an embodiment of the present disclosure.  FIG. 5  is a partial cross-sectional view illustrating a detailed configuration of a film guide on the outer container body  110  that constitutes the blender according to the embodiment of the present disclosure. 
       FIG. 6  is a perspective view illustrating a detailed configuration of a reed switch  234  that constitutes the blender according to an embodiment of the present disclosure.  FIG. 7  is a partial cross-sectional view illustrating a state where the reed switch  234  is mounted.  FIG. 8  is a perspective view illustrating a configuration of a coil holder  130  when viewed from above.  FIG. 9  is a perspective view illustrating a configuration of the coil holder  130  when viewed from below. 
       FIG. 10  is an exploded perspective view illustrating a detailed configuration of a coil holder assembly that constitutes the blender according to an embodiment of the present disclosure, when viewed from above.  FIG. 11  is an exploded perspective view illustrating the detailed configuration of the coil holder assembly that constitutes the blender according to the embodiment of the present disclosure, when viewed from below.  FIG. 12  is a perspective view illustrating a container lid  400 .  FIG. 13  is a cross-sectional perspective view illustrating the container lid  400 .  FIG. 14  is an exploded perspective view illustrating the container lid  400 .  FIG. 15  is an exploded cross-sectional perspective view illustrating the container lid  400 .  FIG. 16  is a perspective view illustrating a container body  100  when viewed from below. 
     As illustrated in these figures, the container body  100  is formed to a cylindrical shape when viewed as a whole and is formed in a double-layered manner. That is, the container body  100  is configured to include the outer container body  110  that provides the exterior appearance of the container body  100  and the inner container body  120  that is positioned inward from the outer container body  110 . 
     It is desirable that the container body  100 , that is, the outer container body  110  and the inner container body  120  are made of a transparent material. That is, it is desirable that the outer container body  110  and the inner container body  120  are made of a transparent material, such as glass, polycyclohexylenedimethylene terephthalate (PCT), or transparent plastic in such a manner that the user may visually check the state of the food inside the container body  100  from the outside. 
     The outer container body  110  provides the exterior appearance of the container body  100 . It is desirable that the external container body  110  is formed to a cylindrical shape that has upper and lower portions of the same size. A main handle  302  is formed in such a manner as to protrude rightward from a right-side external surface of the outer container body  110 . The main handle is to be gripped with the user&#39;s hand. 
     The main handle  302  is formed to the shape of a symbol “¬”. An upper end portion of the main handle  302  is connected to an upper right end portion of the outer container body  110 . It is desirable that the main handle  302  is formed by injection molding in such a manner as to be integrally combined with the outer container body  110 . In this manner, the main handle  302  has relatively more improved strength and durability in terms of an advantage when formed by injection molding in such a manner as to be integrally combined with the outer container body  110  than when jointed or fixed, as a separate single component, to the outer container body  110 . 
     A mounting support  235  that has a predetermined space inside is formed on a portion of the main handle  302  that is connected to the container body  100 . The reed switch  234  is mounted in the mounting support  235 . 
     The switch groove  236  in which the reed switch  234  is accommodated is formed inside the mounting support  235 . That is, the switch groove  236  is formed in the upper end portion of the main handle  302  and provides a space in which the reed switch  234  is mounted. The switch groove  236  is open at the left side. 
     More specifically, the mounting support  235  is configured to include a bottom plate  235   a,  a sidewall  235   b,  and the like. The bottom plate  235   a  extends sideways from flank surface of the outer container body  110  in a manner that is vertical thereto. The sidewall  235   b  extends upward from a right end portion of the bottom plate  235   a  in a manner that is vertical thereto. 
     Therefore, the switch groove  236  of a predetermined size is formed over the bottom plate  235   a.  The switch groove  236  is closed with a covering container lid  124  at the top. The covering container lid  124  extends sideways from an upper end portion of the inner container body  120 . The switch groove  236  is open at the left side, and the transparent electrode film  240  is inserted into the switch groove  236 . 
     A pair of mounting ribs  238  that are spaced apart a predetermined distance are formed on the bottom plate  235   a  in a manner that protrudes upward therefrom to have a predetermined height. The reed switch  234  is fixedly mounted between the pair of mounting ribs  238 . 
     More specifically, the reed switch  234  is configured to include a switch portion  234   a,  a support piece  234   b,  and the like. A switch is provided in the switch portion  234   a.    
     As illustrated, the support piece  234   b  is formed as a flat plate having a predetermined thickness and is mounted on the switch groove  236  in the upward-downward direction, thereby fixedly supporting the switch portion  234   a.  That is, a lower end portion of the support piece  234   b  is fixedly inserted between the pair of mounting ribs  238 . Therefore, it is desirable that a thickness of the lower end portion of the support piece  234   b  is formed in such a manner as to have a size corresponding to a gap between the pair of mounting ribs  238 . 
     It is more desirable that the lower end portion of the support piece  234   b  is forcefully inserted between the gap between the pair of mounting ribs  238  for being mounted therebetween. 
     As illustrated, the switch portion  234   a  is mounted on the support piece  234   b  in a manner that protrudes leftward therefrom. An upper end portion of the transparent electrode film  240  is connected to a left end portion of the switch portion  234   a.    
     A support protrusion  234   c  may be further formed on one end portion of the support piece  234   b.  As illustrated, the support protrusion  234   c  is formed on a left end portion or a right end portion of the support piece  234   b  in a manner that protrudes therefrom to have a predetermined height. Thus, the reed switch  234  is easily mounted on the mounting support  235 , the covering container lid  124  of the inner container body  120 , or the like. 
     An exterior handle  304  and an internal handle  306  are further provided in such a manner as to extend outward from the main handle  302 . That is, as illustrated, the exterior handle  304  is provided to the right side of the main handle  302 , and the internal handle  306  is provided to the left side thereof. 
     More specifically, like the main handle  302 , the exterior handle  304  is also formed to the shape of the symbol “¬” when viewed as a whole. The exterior handle  304  is formed in such a manner as to enclose an upper surface, a right-side surface, and front and rear surfaces of the main handle  302 . It is desirable that the exterior handle  304  is made of a less-unbreakable antirust material having a smooth surface, such as a stainless steel material. This formation of the exterior handle  304  provides a visually aesthetic impression to a consumer. 
     The internal handle  306  encloses a left-side surface and a bottom surface of the main handle  302 . The internal handle  306  is formed to the shape of the symbol “¬” that corresponds to a shape of the bottom surface of the main handle  302 . It is desirable that at least one portion of the internal handle  306  is made of an elastic material. 
     Specifically, the internal handle  306  is configured to include a connection portion  306   a,  a grip portion  306   b,  and the like. The connection portion  306   a  encloses a lower part of the upper end portion of the main handle  302 . The grip portion  306   b  is formed in such a manner as to extend downward from the connection portion  306   a  and encloses the left-side surface of the main handle  302 . 
     It is desirable that, like the external handle  304 , the connection portion  306   a  is made of a less-breakable material having a smooth surface. The grip portion  306   b  is covered by the user&#39;s fingers. Thus, it is desirable that the grip portion  306   b  is made of an elastic material. That is, it is desirable that the connection portion  306   a  is made of a stainless material. The grip portion  306   b  is covered by the user&#39;s four fingers (other than the thumb). Thus, it is desirable that grip portion  306   b  is made of an elastic material, such as rubber, that provides a sense of smooth touch to the user. 
     The inner container body  120  is formed in such a manner as to have a smaller size (diameter) than the outer container body  110  and is seated inside the outer container body  110 . 
     The inner container body  120  is formed to a cylindrical shape that is open at the top. More specifically, as illustrated, the nearer a cross section of the inner container body  120  is to the bottom, the more decreased a diameter thereof. That is, the inner container body  120  is formed in such a manner as to be tapered to the bottom. 
     A plurality of inner guides  122  as described above is formed in the upward-downward direction in an external surface of the inner container body  120 . The blade assembly  200  and the like are mounted on a lower end portion of the inner container body  120 . 
     The projection lip  210  is formed on an upper left end portion of the inner container body  120  in a manner that protrudes leftward. A covering container lid  124  is formed on an upper right end portion of the inner container body  120  in a manner that extends rightward. 
     The covering container lid  124  serves to cover the top of the switch groove  236  in the outer container body  110 . The covering container lid  124  is formed to a plate that has a predetermined thickness. In order to correspond to a size of an upper end portion of the switch groove  236 , the covering container lid  124  is formed in such a manner that the more a right end thereof protrudes rightward, the smaller a width thereof. 
     The blade assembly  200  is mounted on the lower end portion of the inner container body  120 . 
     The blade assembly  200  chops food into small pieces or mix the food using a blade. The blade assembly  200  is configured to include a blade shaft  202 , a blade body  204 , one or more blades, and the like. The blade shaft  202  is supplied with the rotational force from the motor assembly  600 , and thus is rotated. The blade body  204  is provided around the blade shaft  202  and supports the blade shaft  202 . The one or more blades are connected to the blade shaft  202  to be rotated and chop the food into small pieces. 
     The coil holder assembly is further provided between the outer container body  110  and the inner container body  120 . 
     The coil holder assembly is configured to include a coil holder  130 , an upper cover  140 , a lower cover  150 , and the like. An induction coil is provided on the coil holder  130 . The upper cover  140  and the lower cover  150  enclose upper and lower portions, respectively, of the coil holder  130 . 
     Specifically, the coil holder  130  is provided between a bottom surface of the outer container body  110  and a bottom surface of the inner container body  120 . The electric power reception unit  220  and the optical transmission module  810  are mounted on the coil holder  130 . 
     The coil holder  130  has the shape of a circular ring of a predetermined width when viewed as a whole. The electric power reception unit  220  is provided on a right end portion of the coil holder  130  in the shape of the circular ring. That is, although not illustrated in detail, the induction coil receiving electric power is provided on the right end portion of the coil holder  130  and constitutes the electric power reception unit  220 . 
     The electric power reception unit  220  provided on the coil holder  130  may be realized as a reception induction coil  222  patterned in the same plane on a PCB. That is, as illustrated (refer to  FIG. 9 ), in an implementation example of the electric power reception unit  220 , the reception induction coil  222  is wound a number of times in helical form on a reception core  224  on the PCB on the bottom surface of the coil holder  130 . 
     The optical transmission module  810  is provided on the bottom surface of the coil holder  130 . 
     The optical transmission module  810  emits light by electricity supplied from the electric power reception unit  220  and constitutes the detection unit  800 . As described above, it is desirable that an LED or the like is used as the optical transmission module  810 . 
     The electric power reception unit  220  and the optical transmission module  810  are electrically connected to each other. That is, the electric power reception unit  220  and the optical transmission module  810  are formed in such a manner as to form a closed circuit along with the turning-on and -off unit  230  and the like. Therefore, it is desirable that the electric power reception unit  220 , the optical transmission module  810 , the turning-on and -off unit  230 , and the like are configured in such a manner as to be electrically connected to each other by a printed circuit board or the like on the coil holder  130 . 
     As illustrated, the electric power reception unit  220  and the optical transmission module  810  are mounted on a left end portion and a right end portion, respectively, of the coil holder  130  in such a manner to be spaced apart from each other and are configured in such a manner as to be electrically connected to each other by a printed circuit board or the like. In addition, it is also possible that the electric power reception unit  220  and the optical transmission module  810  are both mounted on one of the left end portion and the right end portion of the coil holder  130 , and thus are configured in such a manner as to be in proximity to each other. 
     Although not illustrated, a conversion module that converts alternating current (AC) into direct current (DC) may be further provided on the coil holder  130 . 
     A holder terminal  132  is provided on an upper surface of a right end portion of the coil holder  130 . 
     A lower end portion of the transparent electrode film  240  is inserted into the holder terminal  132  for being connected thereto. 
     As illustrated, the coil holder  130  is formed to the shape of a ring when viewed as a whole. As illustrated, it is desirable that the coil holder  130  is formed in such a manner that the right end portion thereof has a relatively wide so that the electric power reception unit  220  and the like are formed on the right end portion thereof. 
     In this manner, when the coil holder  130  is formed to the shape of a ring, a hole is formed in a center portion of the coil holder  130  in a manner that passes through the center portion thereof. This hole provides a path through the blade assembly  200  and the motor assembly  600  can be connected to each other. That is, it is possible that the rotational force generated by the motor assembly  600  is transferred to the blade assembly  200  without interfering with the coil holder  130 . 
     A plurality of grooves is formed in an inner circumferential surface and an outer circumferential surface of the coil holder  130 . More specifically, a fixation groove  130   a  is formed in each of the front and rear end portions of the coil holder  130  in a manner that is cut inward. A hook through-hole  130   b  is formed in each of the front and rear sides of the right end portion of the coil holder  130  and is formed in the inner side of the left end portion thereof. 
     A fixation guidance piece  148  described below is accommodated in the fixation groove  130   a  in a manner that passes therethrough. An upper or lower hook  140   a  or  150   a  described below is accommodated in the hook through-hole  130   b  or passes therethrough. 
     The coil holder  130  is protected by the upper and lower covers  140  and  150 . The upper cover  140  and the lower cover  150  that correspond to upper and lower surfaces, respectively, of the coil holder  130  are provided over and under the coil holder  130 , respectively and enclose upper and lower portions, respectively, of the coil holder  130 . 
     A terminal holder  142  is formed on a right end portion of the upper cover  140  in a manner that protrudes upward. The holder terminal  132  of the coil holder  130  is accommodated in the terminal holder  142 . Therefore, the holder terminal  132  is inserted, from below, into the terminal holder  142  for being accommodated therein. An upper portion of the terminal holder  142  is formed in such a manner as to be open at the part thereof. A film hole  142   a  is formed in the upper portion of the terminal holder  142  in a manner that passes therethrough from top to bottom. The lower end portion of the transparent electrode film  240  passes through the film hole  142   a.    
     The upper cover  140  is formed in such a manner as to enclose the coil holder  130 . Therefore, an upper edge  144  is formed on an outer circumferential surface of the upper cover  140  in a manner that vertically extends downward therefrom. The upper edge  144  is formed in a manner that has a predetermined height to enclose a flank surface of the coil holder  130 . 
     Like the coil holder  130 , the upper cover  140  is formed to the shape of a ring. An upper hole edge  146  corresponding to the upper edge  144  is formed on a hole in a center portion of the upper cover  140  in a manner that extends downward therefrom. 
     Each of the upper edge  144  and the upper hole edge  146  is formed in such a manner as to be stepped. That is, as illustrated, an edge stepped portion  144   a  is formed on an internal surface of the upper edge  144 , and a hole stepped portion  146   a  is formed on an outer circumferential surface of the upper hole edge  146 . A lower edge  152  and a lower hole edge  154  of the lower cover  150  described below are seated on the edge stepped portion  144   a  and the hole stepped portion  146   a,  respectively. 
     A pair of rib grooves  142   b  are formed in a left-side surface of the terminal holder  142  in a manner that is cut leftward. That is, as illustrated, the pair of rib grooves  142   b  are formed on a right-side surface of the terminal holder  142  and a right-side surface of the upper edge  144 , and a pair of guide ribs  162  described below are accommodated in the pair of rib grooves  142   b.    
     The fixation guidance piece  148  is further formed on a bottom surface of the upper cover  140  in a manner that protrudes downward therefrom. That is, the fixation guidance pieces  148  constituting a pair are formed in front and rear sides, respectively, of the bottom surface of the upper cover  140  in a manner that protrude downward to having a predetermined height. The fixation guidance pieces  148  serve to support the coil holder  130  in a firmly fixed manner. 
     Of course, the fixation guidance pieces  148  may be formed on the lower cover  150  instead of on the upper cover  140 . It is also possible that the fixation guidance pieces  148  are formed on left and right sides, respectively, of the upper cover  140  instead of in the front and rear sides of the bottom surface of the upper cover  140  or that only one fixation guidance piece  148  is formed. It is also possible that the fixation guidance piece  148  is formed to various shapes, such as a circular shape, instead of to a rectangular shape. 
     A hook for combination with the lower cover  150  may be formed on the upper cover  140 . That is, as illustrated, one or more upper hooks  140   a  are formed on each of the upper edge  144  and the upper hole edge  146 . Specifically, a case is illustrated where three upper hooks  140   a  are formed: one on a left end portion of the upper hole edge  146  and one on each of the front and rear sides of a right end portion of the upper edge  144 . 
     Like the upper cover  140 , the lower cover  150  is formed to the shape of a ring when viewed as a whole. An outer edge that is formed in a manner that vertically extends upward is the lower edge  152 . An inner edge that is formed in a manner that extends upward is the lower hole edge  154 . 
     The lower edge  152  and the lower hole edge  154  are formed in such a manner as to have a smaller height than the upper edge  144  and the upper hole edge  146 . The lower edge  152  and the lower hole edge  154  are brought into contact with the edge stepped portion  144   a  and the hole stepped portion  146   a,  respectively, for being combined therewith. The edge stepped portion  144   a  and the hole stepped portion  146   a  are formed on the upper cover  140 . 
     Three lower hooks  150   a  are on the lower cover  150  in a manner that protrudes upward therefrom. The lower hook  150   a  is combined with the upper hook  140   a,  and thus the upper cover  140  and the lower cover  150  are firmly combined with each other. Therefore, the upper hook  140   a  and the lower hook  150   a  have shapes, respectively, that correspond to each other and are formed at positions, respectively, that correspond to each other in the upward-downward direction. 
     As described above, the transparent electrode film  240  is made of a transparent material, such as indium-tin oxide (ITO). The transparent electrode film  240  is configured in such a manner as to have a size corresponding to a length in the upward-downward direction of the container body  100 . 
     The transparent electrode film  240  is provided between the outer container body  110  and the inner container body  120 . In this manner, the presence of the transparent electrode film  240  between the outer container body  110  and the inner container body  120  prevents a contact with the food inside the inner container body  120  and blocks an outside foreign material from coming into contact with the outer container body  110  as well. 
     The transparent electrode film  240  may be attached on a surface of the outer container body  110  or may be attached on a surface of the inner container body  120 . That is, the transparent electrode film  240  may be attached on the internal surface of the outer container body  110  or may be attached on an external surface (outer circumferential surface) of the inner container body  120 . 
     A case where the transparent electrode film  240  is attached on the internal surface of the outer container body  110  in a manner that extends longitudinally in the upward-downward direction is described hereinafter as an example. 
     The transparent electrode film  240 , as illustrated, is bent one or more times. A lower end portion thereof passes through the terminal holder  142  of the upper cover  140  and is connected to the holder terminal  132  of the coil holder  130 , and an upper end portion thereof is connected to the reed switch  234 . 
     A film guide  160  on which the transparent electrode film  240  is attached is formed on the internal surface of the outer container body  110  in a manner that extends longitudinally in the upward-downward direction. That, as illustrated, the film guide  160  is formed on an internal right-side surface of the outer container body  110  in a manner that extends longitudinally in the upward-downward direction, and thus guides attaching of the transparent electrode film  240 . 
     The film guide  160  is configured to include the pair of guide ribs  162 , a guide layer  164 , and the like. The pair of guide ribs  162  is formed on a surface (internal surface) of the outer container body  110  in a manner that protrudes in one direction (inward) therefrom. The guide layer  164  is formed between the pair of guide ribs  162 . 
     As illustrated, the guide ribs  162  are formed in a pair in such a manner as to have a predetermined height. The guide ribs  162  extend in parallel with each other in the upward-downward direction with a predetermined distance therebetween. 
     The guide layer  164  is formed between the pair of guide ribs  162 . It is desirable that the guide layer  164  is formed in such a manner as to have a flat surface. That is, the inner container body  120  and the outer container body  110  have a circular cross section, and thus the flank surface of the outer container body  110  has a predetermined radius of curvature. In contrast, the guide layer  164  is formed in such a manner as to have a flat surface. 
     The flat surface of the guide layer  164  serves to easily attach the transparent electrode film  240  to the guide layer  164 . That is, in order to easily attach the transparent electrode film  240  having a flat surface, it is desirable that the guide layer  164  is formed in such a manner as to have a flat surface. 
     The guide layer  164  may be formed on the surface (internal surface) of the outer container body  110  in a manner that protrudes in one direction (inward) therefrom. Alternative, the guide layer  164  may be formed by recessing the surface (internal surface) of the outer container body  110 . That is, the guide layer  164  to be formed on an internal flank surface of the outer container body  110  may be formed in such a manner as to have the same plane as the internal flank surface of the outer container body  110 . However, the guide layer  164  may be formed on the internal surface of the outer container body  110  in a manner that protrudes inward therefrom. Alternatively, the guide layer  164  may be formed in the internal surface of the outer container body  110  in a manner that is cut inward from the internal surface. 
     It is desirable that the guide layer  164  is formed in such a manner as to have a width corresponding to a width of the transparent electrode film  240 . That is, because the transparent electrode film  240  is attached on the guide layer  164 , it is desirable that the guide layer  164  is formed in such a manner as to have the same width as the transparent electrode film  240  or have a width at least somewhat greater than a width of the transparent electrode film  240 . 
     As described above, the transparent electrode film  240  is mounted on the film guide  160  formed on the internal surface of the outer container body  110  in a manner that extends longitudinally in the upward-downward direction. 
     The transparent electrode film  240  vertically extends sideways from an upper end portion of the outer container body  110  and a connection portion A of the main handle  302 . In this case, in order to prevent the transparent electrode film  240  from breaking off, it is desirable that the connection portion A has a shape of a circular arc having a predetermined radius R. That is, the connection portion A where an upper end portion of the right side of the outer container body  110  and the bottom plate  235   a  of the mounting support  235  are connected to each other is formed in such a manner as to be rounded with a radius of curvature. It is desirable that the connection portion A is formed in such a manner that the transparent electrode film  240  is seamlessly attached for being mounted. 
     The magnet groove  126  in which the permanent magnet  232  is accommodated is formed in the upper end portion of the inner container body  120  in a manner that is cut outward. That is, as illustrated (refer to  FIG. 7 ), the right side of the inner container body  120  is partly cut off rightward in such a manner as to be stepped, and thus the magnet groove  126  is formed. The permanent magnet  232  and a magnet holder  404  described below are positioned in the magnet groove  126 . 
     It is desirable that the magnet groove  126  is formed in one side of the switch groove  236 . That is, as illustrated (refer to  FIG. 7 ), the magnet groove  126  is formed in the left side of the switch groove  236  in which the reed switch  234  is accommodated. Therefore, the reed switch  234  accommodated in the switch groove  236  and the permanent magnet  232  are in proximity to each other, and thus the reed switch  234  operates by the permanent magnet  232 . 
     The container lid  400  is configured to include an outer wall  410 , an inner wall  420 , an upper circular plate  430 , and the like. The outer wall  410  is formed in such a manner as to have the shape of a circular ring and provides an exterior appearance of the cover casing  420 . The inner wall  420  is formed in such a manner as to have a smaller diameter than the outer wall  410  and to have the cover hole  401  in the center thereof. The upper circular plate  430  connects respective upper ends of the outer wall  422  and the inner wall  424  to each other. 
     Specifically, the container lid  400  is formed to a shape of a circular ring of a predetermined width that is closed at the top, when viewed as a whole. That is, the cover hole  401  described below is formed in a center portion of the container lid  400  in a manner that passes through the center portion thereof from top to bottom. The contain lid  400  has a circular-ring structure that has a longitudinal cross-sectional area in the shape of “∩”. 
     The container lid  400  serves to cover the top of the container body  100 . The cover hole  401  is formed in the center portion of the container lid  400  in a manner that passes through the center portion thereof from top to bottom. 
     The cap  450  is detachably mounted in the cover hole  401 . That is, as illustrated, the cover hole  401  is formed in the center portion of the container lid  400  in a manner that passes through the center portion thereof from top to bottom. The cover hole  401  is opened and closed by the cap  450 . 
     The cap  450  is configured to include an upper surface plate  460 , a cap body  470 , and the like. The upper surface plate  460  is exposed to the outside at an upper surface of the container lid  400 . The cap body  470  is accommodated in the cover hole  401 . 
     The cap body  470 , as illustrated, is formed to a shape of a truncated cone that has an empty space inside when viewed as a whole. That is, the cap body  470  is formed to a shape of a truncated cone of which a cross-sectional diameter gradually decreases toward an upper side thereof. 
     The upper surface plate  460  opens and closes the tip of the cap body  470 . As illustrated, the upper surface plate  452  is formed in such a manner as to have a greater diameter than an end portion of the cap body  470 . 
     An intermediate ring  472 , a lower ring  474 , and the like are provided on the cap body  470 . The intermediate ring  472  is formed in a manner that protrudes outward, and thus is brought into contact with an internal surface of an upper end portion of the cover hole  401 . The lower ring  474  is formed on an outer circumferential surface of a lower end portion of the cap body  470  in a manner that protrudes outward therefrom, and thus is brought into contact with an internal surface of a lower end portion of the cover hole  401 . 
     Specifically, the intermediate ring  472  is formed on a center portion of the cap body  470  in a manner that protrudes outward therefrom. When the cap  450  is mounted on the container lid  400 , the intermediate ring  472  lies in the same plane with the upper circular plate  430  of the container lid  400 . Therefore, an upper portion of the intermediate ring  472  is exposed to the outside at the top of the container lid  400 . 
     An air groove  476  is further formed in the intermediate ring  472 . 
     The air groove  476  serves to allow air to flow through the intermediate ring  472  on the cap  450  in the upward-downward direction. As illustrated, the air groove  476  is formed in a manner that is cut inward from an outer circumferential surface of the intermediate ring  472 . 
     As illustrated, the lower ring  474  is formed on the outer circumferential surface of the lower end portion of the cap body  470  in a manner that extends outward therefrom. An outer circumferential surface of the lower ring  474  is brought into contact with an inner circumferential surface of a lower end portion of the inner wall  420  of the container lid  400 . 
     As illustrated, it is desirable that the outer wall  410  is formed in such a manner as to have a height corresponding to a height of the inner wall  420  or is formed in such a manner as to have a greater height than the inner wall  420 . 
     The gasket  402  described above is provided on an outer circumferential surface of a lower end portion of the outer wall  410 . It is desirable that the gasket  402  is made of an elastic material, such as rubber. 
     An intermediate jaw  422  and a lower jaw  424  are formed on an internal surface of the inner wall  420  in a manner that protrudes inward. The intermediate jaw  422  supports a lower end portion of the intermediate ring  472  of the cap  450 . The lower jaw  424  is brought into contact with an external surface of the lower ring  474 . 
     As illustrated, the intermediate jaw  422  is formed on the internal surface of the inner wall  420  in a manner that protrudes inward therefrom to have a predetermined thickness. It is desirable that a plurality of intermediate jaws  422  is formed in such a manner as to be spaced apart. Therefore, it is possible that the air flows through a space between the plurality of intermediate jaws  422  in the upward-downward direction. 
     The lower jaw  424  is formed on an internal surface of the lower end portion of the inner wall  420  in a manner that protrudes inward therefrom. As illustrated, it is desirable that the lower jaw  424  is formed in a manner that protrudes more inward than the intermediate jaw  422 . 
     A fastening protrusion  478  is further formed on the lower end portion of the cap  450  in a manner that protrudes outward therefrom. A locking path  440  is formed on a lower end portion of the inner wall  420 . The locking path  400  serves to accommodate the fastening protrusion  478  and to prevent the accommodated fastening protrusion  478  from deviating therefrom. 
     More specifically, the fastening protrusion  478  is formed on the outer circumferential surface of the lower ring  474  of the cap  450  in a manner that protrudes outward therefrom. The fastening protrusion  478  serves to prevent the cap  450  mounted on the container lid  400  from deviating from the container lid  400 . 
     The locking path  440  serves to accommodate the fastening protrusion  478 , and thus to prevent the accommodated fastening protrusion  478  from deviating therefrom. The locking path  440  is configured to include an access groove  442 , a locking groove  444 , and the like. The access groove  442  is formed in a manner that is cut inward from an inner circumferential surface of the lower jaw  424  of the inner wall  420 , and guides moving of the fastening protrusion  478  in the upward-downward direction. The locking groove  444  is formed in a lower end portion of the access groove  442  in a manner that extends sideways therefrom, and prevents the fastening protrusion  478  from deviating upward. 
     That is, as illustrated, one portion of the lower jaw  424  is cut off, and thus the access groove  442  is formed. The access groove  442  extends a predetermined distance downward and then vertically extends sideways. Then, the access groove  442  communicates with the locking groove  444  that further extends a predetermined distance sideways. 
     Therefore, the fastening protrusion  478  moves downward along the access groove  442 , moves sideways, and is accommodated in the locking groove  444 . When accommodated, the fastening protrusion  478  is prevented from deviating from the locking groove  444 . 
     Of course, the access groove  442  and the locking groove  444  also serve to create a gap between the cap  450  and the container lid  400  and further serves as a path along which the air flows through the container lid  400  from top to bottom. That is, it is possible that the air flows into and out of the container body  100  through the locking path  440 , the air groove  476 , and the like. 
     The reason why the air is enabled to flow into and out of the container body  100  along the locking path  440  and the air groove  476  that are not positioned in a straight line in the upward-downward direction is that, when food is chopped into small pieces and mixed inside the container body  100 , there is a need to prevent a pressure difference from occurring between the inside and the outside of the container body  100  and to prevent the food inside the container body  100  from being discharged to the outside. 
     A magnet holder  404  is further provided on the outer circumferential surface of the container lid  400 . That is, as illustrated, the magnet holder  404  is formed in the outer circumferential surface of the container lid  400  in a manner that protrudes outward. The permanent magnet  232  is inserted into the magnet holder  404 . 
     When the container lid  400  is attached on the upper surface of the container body  100  or detached therefrom, the permanent magnet  232  serves to perform control to turn on and off the reed switch  234 . 
     The container body  100  is formed in such a manner that a bottom surface thereof has a shape corresponding to a shape of the upper surface of the main body  500 . With this configuration, the container body  100  is easily attached and detached on and from the upper surface of the main body  500 . 
     More specifically, the container body  100  is seated on the seating support  900  of the main body  500  described below. 
     The container body  100  is formed in such a manner that the bottom surface thereof has a shape corresponding to a shape of an upper end portion of the main body  500 . Thus, the container body  100  is seated on the main body  500  and is easily removed therefrom. 
     An edge rim  170  of a predetermined width is formed on the bottom surface of the container body  100  in a manner that protrudes downward. The edge rim  170  is brought into contact with an upper surface of a lower rim  910  of the seating support  900  on the main body  500 . The edge rim  170  is formed to a shape corresponding to a shape of an upper surface of the lower rim  910 . The lower rim  910  will be described below. 
     One part of a center portion of the bottom surface of the container body  100  is recessed in the upward direction, and thus an upper-rim accommodation groove  172  is formed. That is, the one part of the center portion of the bottom surface of the container body  100  is recessed in the upward direction inward from the edge rim  170  of the container body  100 , and thus the upper-rim accommodation groove  172  is formed. When the container body  100  is seated on the main body  500 , an upper rim  920  of the seating support  900  on the main body  500  is accommodated in the upper-rim accommodation groove  172 . The upper rim  920  will be described below. 
     The edge rim  170  is formed to a shape of a circular ring that has an opening at one portion thereof. A coil seating part  940  described below is accommodated in this opening. That is, the edge rim  170  is open at the right ends, and thus a coil seating groove  170   a  is formed. The coil seating part  940  described below is accommodated in the coil seating groove  170   a.    
     One part of the center portion of the bottom surface of the container body  100  protrudes downward, and thus a circular rim  174  is formed. That is, the center portion of the upper-rim accommodation groove  172  includes the circular rim  174  protruding downward. 
     As illustrated, the circular rim  174  has the shape of a circular ring. The circular rim  174  is open at the center. The circular rim  174  provides a path along which the blade assembly  200  and the motor assembly  600  may be connected to each other. 
     The circular rim  174  is accommodated in a circular-rim accommodation groove  980  formed in the main body  500 . The circular-rim accommodation groove  980  will be described below. 
     A plurality of mounting protrusions  174   a  that protrude radially is further provided on an outer circumferential surface of the circular rim  174 . The mounting protrusion  174   a  serves to hold the container body  100  firmly at its home position on the main body  500  and to keep the container body  100  stationary without being rotated. One or more mounting protrusions  174   a  are provided. 
     According to the present disclosure, an example is illustrated where four mounting protrusions  174   a  are provided. It is desirable that the mounting protrusion  174   a  is formed in such a manner that the farther an end thereof extends outward from the outer circumferential surface of the circular rim  174 , the more decreased a diameter thereof. The reason for this is to easily accommodate the mounting protrusion  174   a  in the protrusion groove  982  described below. 
       FIGS. 17 to 19  are views each illustrating in detail components in an upper half of the main body  500 .  FIG. 17  is a perspective view illustrating the main body  500 .  FIG. 18  is an exploded perspective view illustrating the components in the upper half of the main body  500 .  FIG. 19  is a perspective view illustrating a state where a cover is removed from the main body  500 . 
     As illustrated in  FIGS. 17 to 19 , the seating support  900  is provided on the upper surface of the main body  500  in a manner that protrudes upward to be stepped. The bottom of the container body  100  is seated on the seating support  900 . 
     The lower end portion of the container body  100  is seated on the seating support  900  and is supported thereon. Therefore, it is desirable that the seating support  900  is formed in such a manner as to have a shape corresponding to a shape of the lower end portion of the container body  100 . 
     Specifically, the seating support  900  is configured to include the lower rim  910 , the upper rim  920 , and the like. The lower rim  910  is formed in such a manner as to be stepped and has a diameter corresponding to a diameter of the lower end portion of the container body  100 . The upper rim  920  is formed in such a manner as to protrude upward from the lower rim  910  and has a smaller diameter than the lower rim  910 . 
     As illustrated, the lower rim  910  is formed in such a manner as to have a circular shape and a predetermined height. The upper rim  920  having a smaller diameter than the lower rim  910  is formed on the upper surface of the lower rim  910  in such a manner as to protrude upward therefrom to a predetermined height. 
     Therefore, it is desirable that a step surface  902 , like the upper surface of the main body  500 , is in the horizontal plane formed between the lower rim  910  having a relatively great diameter and the upper rim  920  having a relatively small diameter. That is, it is desirable that the step surface  902  is formed in such a manner as to be in parallel with the upper surface of the main body  500 . 
     An exterior ring  912  and an upper end ring  914  are provided on external surfaces, respectively, of the lower rim  910  and the upper rim  920 . The exterior ring  912  and an upper end ring  914  have shapes corresponding to shapes, respectively, of the external surfaces of the lower rim  910  and the upper rim  920 . The exterior ring  912  and the upper end ring  914  are provided on outer circumferential surfaces, respectively, of the lower rim  910  and the upper rim  920  that have a circular external surface, and thus enclose external surfaces (flank surfaces), respectively, of the lower rim  910  and the upper rim  920 . 
     The exterior ring  912  and the upper end ring  914  serve to protect components inside and serve as an exterior material. Therefore, it is desirable that like the exterior handle  304 , the exterior ring  912  and the upper end ring  914  are made of an antirust material having a smooth surface, such as a stainless steel material. 
     An elastic member  930  made of an elastic material is further provided on the step surface  902  between the upper rim  920  and the lower rim  910 . It is desirable that as illustrated, the elastic member  930  is formed in such a manner as to cover the step surface  902  formed on the upper surface of the lower rim  910  and to enclose a lower portion of the upper rim  920 . 
     The elastic member  930  is made of an elastic material, and thus serves as a cushion that absorbs shock when the container body  100  is placed on the main body  500 . 
     That is, when the bottom surface of the container body  100  is brought into contact with the upper rim  920 , the elastic member  930  also serves to prevent the upper rim  920  and the lower rim  910  on the main body  500 , which are made of a solid material, and the bottom surface of the container body  100  from being damaged or from generating noise due to collision with each other. 
     In this manner, the elastic member  930 , made of a material, such as rubber, is used to smoothly seat the container body  100  on the main body  500  without any shock. In addition, conductivity rubber may be used whenever necessary. In this case, conductivity rubber may also be provided on the bottom of the container body  100 . 
     The electric power transmission unit  700  and the optical reception module  820  are mounted on an upper surface of the upper rim  920 . 
     More specifically, a right-side surface of the upper rim  920  further protrudes rightward, and the coil seating part  940  is formed on the right-side surface thereof. The electric power transmission unit  700  is mounted on an upper surface of the coil seating part  940 . 
     The electric power transmission unit  700  is positioned adjacent to the electric power reception unit  220  provided on the container body  100  and serves to supply electric power to the electric power reception unit  220 . Therefore, it is desirable that the electric power transmission unit  700  is configured as an induction coil. That is, like the electric power reception unit  220 , the electric power transmission unit  700  may be configured as an induction coil wound a number of times in helical form on a core (not illustrated) on the same surface and may be mounted on a PCB. 
     In addition, although not illustrated in detail, an oscillation circuit unit may be provided inside the main body  500 . The oscillation circuit unit may generate electric power and may apply electric current to the electric power transmission unit  700 . A magnetic field may be produced by the electric current applied to the electric power transmission unit  700 . Then, the oscillation circuit unit may change strength of the electric current that is applied to the electric power transmission unit  700 , and the change in the strength of the electric current changes the magnetic field in the electric power transmission unit  700 . 
     Therefore, according to the present disclosure, when the electric power reception unit  220  and the electric power transmission unit  700  are mounted in such a manner as to correspond to each other in the upward-downward direction, the strength of the electric current that is applied to the electric power transmission unit  700  is changed, and the magnetic field in the electric power transmission unit  700  is accordingly changed. Thus, inductive coupling between the electric power transmission unit  700  and the electric power reception unit  220  changes magnetic flux passing through the electric power reception unit  220 . Consequently, an induced electromotive force develops in the electric power reception unit  220 . This induced electromotive force may also be supplied to the optical transmission module  810 . 
     The optical reception module  820  is provided in a direction opposite to a direction of the electric power transmission unit  700 . That is, it is desirable that the optical reception module  820  is provided in a reception groove  822  formed in an upper surface of a left end portion of the upper rim  920 . The reception groove  822  is positioned in a manner that corresponds in the upward-downward direction to the optical transmission module  810  mounted on the container body  100 . 
     More specifically, the reception groove  822  of a predetermined size is formed in the upper surface of the left end portion of the upper rim  920  in a manner that is cut downward. The optical reception module  820  is fixedly mounted in the reception groove  822 . 
     It is desirable that the optical reception module  820 , as described above, includes a photosensor or photodetector. The optical reception module  820  may receive light transmitted by the optical transmission module  810  and may transmit this received optical signal. 
     Of course, the optical reception module  820  and the electric power transmission unit  700  may be mounted on one portion of an upper surface of the seating support  900  in such a manner as to be in proximity to each other. 
     That is, as illustrated, the electric power reception unit  220  and the optical transmission module  810  are configured to be mounted on the right end portion and left end portion, respectively, of the coil holder  130  in such a manner as to be spaced apart from each other. In addition to this configuration, in a case where the electric power reception unit  220  and the optical transmission module  810  are both configured to be mounted on one of the right end portion and the left end portion of the coil holder  130  in such a manner as to be in proximity to each other, it is desirable that the electric power reception unit  220  and the optical transmission module  810  are both mounted on the left side of the seating support  900  or on the right thereof in such a manner as to correspond to each other in the upward-downward direction and in such a manner as to be in proximity to each other. 
     In this manner, at least a part of the detection system may be provided on the seating support  900 . That is, the electric power reception unit  220 , the optical transmission module  810 , and the like that constitute the detection system may be mounted on the seating support  900 . 
     A Hall sensor  950  and a container body detection switch  960  may be further provided on the upper surface of the upper rim  920 . That is, a container body switch groove  962  and a sensor groove  952  are formed in upper surfaces, respectively, of leading and rear end portions of the upper rim  920  in a manner that is cut downward. The container body detection switch  960  and the Hall sensor  950  are fixedly mounted in the container body switch groove  962  and the sensor groove  952 , respectively. 
     The container body detection switch  960  is configured as a reed switch and serves to detect whether or not the container body  100  is seated on the upper surface of the main body  500 . In a case where the container body detection switch  960  is mounted, a magnet (not illustrated) corresponding to the container body detection switch  960  is also further provided on the lower end portion of the container body  100 . 
     The Hall sensor  950  serves to determine a type of the container body  100  seated on the main body  500 . In this case, a signal transfer unit that corresponds to the bottom surface of the container body  100  may also be necessary. 
     The upper end ring  914  is mounted an edge of the upper rim  920 . It is desirable that the upper end ring  914  is configured in such a manner as to be separated into two pieces. That is, as illustrated, the right-side surface of the upper rim  920  protrudes rightward, and thus the coil seating part  940  is formed. Therefore, the upper end ring  914  is configured to include a protrusion piece  916  and a curvature piece  918 . The protrusion piece  916  encloses an external surface of the coil seating part  940 . The curvature piece  918  encloses portions other than the external surface thereof. 
     An upper portion of the upper rim  920  is covered by a cover  970 . Therefore, the electric power transmission unit  700 , the optical reception module  820 , the container body detection switch  960 , the Hall sensor  950 , and the like that are mounted on the upper rim  920  are covered by the cover  970  for being protected. 
     In this manner, the cover  970  serves to fix the electric power transmission unit  700 , the optical reception module  820 , the container body detection switch  960 , the Hall sensor  950 , and the like, which are mounted on the upper rim  920 , at their original positions, respectively, and serves to separate these components from the outside for protection. 
     It is desirable that the cover  970  is made of a material capable of transmitting light and a signal. That is, the electric power transmission unit  700 , the optical reception module  820 , the container body detection switch  960 , the Hall sensor  950 , and the like that are mounted below the cover  970  need to receive a signal, light, and the like that are transmitted from the container body  100 . Thus, it is desirable that the cover  970  is made of a material capable of transmitting light and a signal. 
     A center portion of the seating support  900  is open at the top and bottom. Thus, the blade assembly  200  of the container body  100  and the motor assembly  600  built into the main body  500  are connected to each other. 
     More specifically, the circular-rim accommodation groove  980  is formed in a center portion of the upper rim  920  in a manner that is cut downward. The above-described circular rim  174  on a lower end of the container body  100  is accommodated in the circular-rim accommodation groove  980 . That is, the upper rim  920  has the shape of a circular ring when viewed as a whole. The circular-rim accommodation groove  980  in the shape of a circle is formed in the center portion of the upper rim  920 . 
     One or more protrusion grooves  982  are formed in an internal surface of the upper rim  920 . One or more portions of the protrusion groove  982  are recessed outward, and thus one or more circular-rim accommodation grooves  980  are radially formed. The mounting protrusion  174   a  of the container body  100  is seated in the circular-rim accommodation groove  982 . 
     Therefore, it is desirable that the protrusion grooves  982  are formed in such a manner that the number or sizes thereof correspond to the number or sizes of the mounting protrusions  174   a  and that the protrusion groove  982  is formed in such a manner that a size thereof corresponds to a size of the mounting protrusion  174   a.  It is desirable that the protrusion groove  982  is formed in such a manner as to have the same width as or a greater width than the mounting protrusions  174   a.    
       FIG. 20  is a perspective view illustrating a detailed configuration of the cover  970 .  FIG. 21  is a perspective view illustrating a detailed configuration of the curvature piece  918  of the upper end ring  914 . 
     As illustrated in  FIGS. 20 and 21 , the curvature piece  918  is mounted in such a manner as to enclose a flank surface of the upper rim  920 . An upper-end rim  918   a  is further formed on an upper end portion of the curvature piece  918  in a manner that vertically extends inward therefrom. The upper-end rim  918   a  encloses a cover edge  972  of the cover  970  described below. 
     The cover  970  is configured to include the cover edge  972  in the shape of a circle and cover portions  970   a,    970   b,    970   c , and  970   d,  and the like. The cover portions  970   a,    970   b,    970   c , and  970   d  are integrally formed with the cover edge  972  and cover components, respectively, that are provided thereunder. 
     Specifically, the cover edge  972  of a circular ring of the cover  970  is formed to a shape of a circular ring. The cover portions  970   a,    970   b,    970   c,  and  970   d  are formed on front, rear, left, and right sides, respectively, of the cover edge  972 . 
     The cover portions  970   a,    970   b,    970   c,  and  970   d  are referred to as a coil cover portion  970   a,  a reception cover portion  970   b,  a sensor cover portion  970   c,  and a container body cover portion  970   d,  respectively. 
     The coil cover portion  970   a,  as illustrated, is formed on a right end portion of the cover edge  972  and covers the upper surface of the coil seating part  940 . The reception cover portion  970   b  is formed on a left end portion of the cover edge  972 , which is opposite in direction to the coil cover portion  970   a,  and covers an upper surface of the reception groove  822  in which the optical reception module  820  is fixedly mounted. 
     The container body cover portion  970   d  and the sensor cover portion  970   c  are formed on a front end portion and a rear end portion, respectively, of the cover edge  972 . 
     The container body cover portion  970   d  and the sensor cover portion  970   c  covers upper surfaces, respectively, of the container body detection switch  960  and the Hall sensor  950  that are fixedly mounted in the container body switch groove  962  and the sensor groove  952 , respectively, in the upper surface of the upper rim  920 . 
     It is desirable that upper surfaces of the cover portions  970   a,    970   b,    970   c,  and  970   d  are formed in such a manner as to protrude upward above an upper surface of the cover edge  972 . That is, as illustrated, the upper surfaces of cover portions  970   a,    970   b,    970   c,  and  970   d  protrude upward above the cover edge  972 . 
     The cover edge  972  is formed in such a manner that the upper surface thereof corresponds to the upper-end rim  918   a  of the curvature piece  918 . Therefore, when the cover  970  and the curvature piece  918  are mounted on the upper rim  920 , the upper-end rim  918   a  of the curvature piece  918  pushes the cover edge  972  of the cover  970  from above to fix the cover edge  972 . 
     A cover groove  974  is formed between each of the cover portions  970   a,    970   b,    970   c,  and  970   d.  The cover groove  974  is formed at a position that corresponds to a position of the protrusion groove  982  in the upward-downward direction. When the container body  100  is mounted on the main body  500 , the mounting protrusion  174   a  of the container body  100  is seated in or passes through the cover groove  974 . 
     A cover rib  976  may be further formed on the cover portions  970   a,    970   b,    970   c,  and  970   d  or the cover edge  972  in a manner that protrudes downward therefrom. The cover rib  976  serves to easily combine the cover  970  with the upper surface of the upper rim  920 . 
       FIG. 22  illustrates an example of a configuration of the electric power transmission unit  700 .  FIGS. 23 and 24  illustrate an example of an arrangement of the electric power transmission unit  700  and the coil holder  130 . FIG . 22  is a perspective view illustrating an implementation example of the electric power transmission unit  700  that constitutes the blender according to the embodiment of the present disclosure.  FIG. 23  is an exploded perspective view illustrating the arrangement of the electric power transmission unit  700  and the coil holder  130  in relation to each other.  FIG. 24  is a front exploded view illustrating the arrangement of the electric power transmission unit  700  and the coil holder  130  in relation to each other. 
     As described above, the electric power transmission unit  700  may be mounted at one position in an upper portion of the main body  500 . 
     The electric power transmission unit  700  may be realized as a transmission induction coil  702  patterned in the same plane on a PCB. The transmission induction coil  702  may be configured as an induction coil wound a number of times in helical form on a transmission core  704  on a PCB. 
     The main body  500  may have an oscillation circuit unit (not illustrated) inside. The oscillation circuit unit (not illustrated) may apply electric current to the transmission induction coil  702 . When the electric current is applied to the transmission induction coil  702 , a magnetic field may be produced at the transmission induction coil  702 . 
     The oscillation circuit unit (not illustrated) may be mounted on the electric power transmission unit  700 . The oscillation circuit unit (not illustrated) may change the strength of electric current applied to the transmission induction coil  702 . The change in the strength of electric current may change the magnetic field at the transmission induction coil  702 . 
     It is desirable that the optical transmission module  810  and the optical reception module  820  are positioned in such a manner as to be in proximity to each other. As illustrated, when the container body  100  is mounted on the main body  500 , the optical transmission module  810  and the optical reception module  820  are positioned in proximity to each other in the upward-downward direction. 
     When the optical reception module  820  receives a signal of the optical transmission module  810 , the motor assembly  600  may be driven. 
     As in the implementation example illustrated, it is desirable that when the container body  100  is seated on the main body  500 , the transmission induction coil  702  of the main body  500  and the reception induction coil  222  of the container body  100  are arranged at positions, respectively, that correspond to each other, in such a manner as to be spaced apart. 
     Specifically, when the container body  100  is seated on the main body  500 , it is desirable that the transmission induction coil  702  constituting the electric power transmission unit  700  and the reception induction coil  222  constituting the electric power reception unit  220  are arranged in such a manner that the transmission and reception cores  704  and  224  and the transmission induction coil  702  and the reception induction coil  222  face each other in parallel with each other. 
     Under a specific condition, inductive coupling may be selectively performed between the transmission induction coil  702  constituting the electric power transmission unit  700  and the reception induction coil  222  constituting the electric power reception unit  220 . 
     The change in the strength of the electric current applied to the transmission induction coil  702  changes the magnetic field at the transmission induction coil  702 . The inductive coupling between the transmission induction coil  702  and the reception induction coil  222  changes magnetic flux passing through the reception induction coil  222 . Thus, an induced electromotive force develops in the reception induction coil  222 . 
     Therefore, it is desirable that the positions of the transmission induction coil  702  and the reception induction coil  222  and the arrangement thereof are determined in such a manner that the inductive coupling therebetween is successfully performed. 
     In addition, as described above, the optical transmission module  810  transmitting a signal to the outside is provided in a lower portion of the container body  100 . According to the present embodiment, a case is illustrated where the optical transmission module  810  is mounted on a lower surface of the left end portion of the coil holder  130 . 
     It is desirable that the reception induction coil  222  of the coil holder  130  and the optical transmission module  810  are electrically connected to each other. The optical transmission module  810  is supplied with electric power from the reception induction coil  222 , and thus may transmit a signal. 
     The optical transmission module  810  may transmit a signal to the optical reception module  820  provided in the main body  500 . That is, the optical reception module  820  may receive the signal transmitted by the optical transmission module  810 . 
     Therefore, it is desirable that the optical transmission module  810  and the optical reception module  820  are arranged at positions, respectively, that face each other, in such a manner that transmission and reception of the signal therebetween are smoothly performed. According to the present embodiment, the container body  100 , when combined with the main body  500 , is positioned in such a manner as to be spaced apart in the upward-downward direction from the main body  500 . 
     As described above, according to the embodiment of the present disclosure, the optical transmission module  810 , for example, may include a light source that emits light, and the optical reception module  820  may include an optical sensor that detects the emitted light. The light sources may include a LED, and the optical sensor may be realized as a semiconductor element, a photodiode, a phototransistor, or the like. 
     Operation of the blender according to the present disclosure that has the configuration as described above will be described below with reference to the accompanying drawings. 
     The container body  100  is seated on the main body  500  as illustrated in  FIG. 1 . In this state, the blender according to the present disclosure is ready for use. 
     First, electric power needs to be supplied from the outside in order to use the blender. It is possible that the wireless electric power module  520  supplies the electric power in a wireless manner. That is, it is possible that the electric power is supplied from the outside using an induced electromotive force. Of course, it is also possible that the electric power is supplied in a wired manner. 
     The wireless electric power module  520  supplies the electric power to components, such as the motor assembly  600 , the touch operation unit  504 , and the electric power transmission unit  700 , that need the electric power for operating. The user may operate the blender or may stop the blender by operating the touch operation unit  504  or the knob  502 . 
     For example, when the user operates the touch operation unit  504  or the knob  502 , the motor assembly  600  operates, the blades of the blade assembly  200  are rotated, and then food is chopped into small pieces. 
     At this time, the detection system determines whether or not the container lid  400  is attached. In this case where the container lid  400  is not attached, the motor assembly  600  and the blade assembly  200  do not operate. 
     Specifically, the reed switch  234  is turned off when the blender is not in use. Therefore, the electric power reception unit  220 , the reed switch  234 , the optical transmission module  810 , and the like do not form a closed circuit within the container body  100 , and thus light reception does not occur in the optical reception module  820 . 
     In this manner, when the light reception does not occur in the optical reception module  820 , with no signal representing the non-occurrence of the light reception, the motor assembly  600  is blocked from receiving electric power. 
     When the container lid  400  is attached in this state, the permanent magnet  232  of the container lid  400  is positioned in proximity to the reed switch  234 , and thus the reed switch  234  is turned on. In return, the electric power reception unit  220 , the reed switch  234 , the optical transmission module  810 , and the like form the closed circuit. Accordingly, the optical reception module  820  receives light that occurs in the optical transmission module  810 . 
     Thus, when it is detected that the container lid  400  is attached, the motor assembly  600  starts to operate according to the user&#39;s operation. The food inside the container body  100  is chopped into small pieces. Of course, at this time, it is desirable that the container body detection switch  960  or the like also detects whether or not the container body  100  is mounted on the main body  500 , and thus that the motor assembly  600  starts to operate. 
     At this time, an operating state of the blender according to the present disclosure is displayed on the display unit  506  or the like for being viewed from the outside. Thus, the user may visually recognize the operating state, operation time, and the like of the blender. 
     When attaching or detaching the container lid  400  on and from the container body  100 , the user attaches or detaches the container lid  400  while holding an upper portion of the cap  450  with their hand. The user presses the container lid  400  in a direction of motion from upward to downward, and thus the container lid  400  is brought into contact with the upper surface of the container body  100  and thus is fixed thereto. At this time, the gasket  402  provided on an external surface of the container lid  400  bridges a gap between the container lid  400  and the container body  100 . 
     In addition, the user may separate the cap  450  mounted on the center portion of the container lid  400  from the center portion thereof. As described above, the user may perform this separation operation by rotating the cap  450  while holding the upper end portion thereof with their hand. 
     For example, in order to mount the cap  450  on the container lid  400 , while holding the upper end portion of the cap  450  with their hand, the user enables the fastening protrusion  478  of the cap  450  to pass through the access groove  442  in the container lid  400  from top to bottom, and thus rotates the fastening protrusion  478  clockwise. When this operation is performed, the fastening protrusion  478  is accommodated in the locking groove  444 . Thus, the cap  450  is completely mounted. At the same time, the cap  450  is prevented from deviating upward. 
     In this state, when the user rotates the cap  450  counterclockwise while holding the upper end portion of the cap  450 , the fastening protrusion  478  moves from the locking groove  444  and is positioned under the access groove  442 . In this state, when the user pulls up the cap  450 , the fastening protrusion  478  passes through the access groove  442  from bottom to top. Thus, the cap  450  is separated from the container lid  400 . 
     In a state where the cap  450  is mounted on the container lid  400 , it is possible that air flows through the container lid  400  in the upward-downward direction through the air groove  476 . Thus, the container body  100  does not become a vacuum. Accordingly, a pressure difference is prevented from occurring between the inside and the outside of the container body  100 . 
     When the cap  450 , as described above, is separated from the container lid  400 , the user may place the food into the container body  100  through the cover hole  401  or may stir food inside the container body  100  using a rod or the like. 
     When with the operation of each of the motor assembly  600  and the blade assembly  200 , an operation of chopping food inside the container body  100  into small pieces or an operation of mixing food inside the container body  100  is finished according to the user&#39;s intention, the user may lift the container body  100  upward from the main body  500  for being separated therefrom and then may detach the container lid  400  to take the food out of the container body  100 . 
     The present disclosure is not limited to the embodiments described above. It would be apparent to a person of ordinary skill in the art that various modifications will be made to the embodiments of the present disclosure without departing the scope of the present disclosure. 
     For example, according to the embodiment, the case where the optical transmission module  810  and the optical reception module  820  are mounted on the respective left end portions, respectively, of the container body  100  and the main body  500 , is described as an example. However, it is also possible that the optical transmission module  810  and the optical reception module  820  are mounted on respective right end portions, respectively, of the container body  100  and the main body  500 , or on respective front or rear end portions, respectively, of the container body  100  and the main body  500 . 
     In addition, according to the present embodiment, the case where only one optical reception module  820  is mounted in the main body  500  is described. However, it is also possible that two or more optical reception modules  820  are mounted in the main body  500 . It is also possible that the optical reception module  820  in the shape of a ring is formed on the upper surface of the upper rim  920 . In this case, regardless of a direction in which the container body  100  is mounted, it can be detected whether or not the container lid  400  is mounted. 
     It is also possible that two or more transmission coils, each constituting the electric power transmission unit  700 , are mounted. Furthermore, it is also possible that the transmission coil in the shape of a ring is formed on the upper surface of the upper rim  920 . In this case, transmission of electric power is possible regardless of a position where the container body  100  is mounted. In addition, the detection system may be configured in various forms. That is, instead of the optical transmission module  810 , the optical reception module  820 , the electric power transmission unit  700 , and the electric power reception unit  220 , an electrode plate (not illustrated) may be mounted on each of the container body  100  and the main body  500  and then may be configured in such a manner as to determine whether or not a capacitor is charged and whether or not a capacitance is detected. Various methods including a method in which whether or not a change in a magnetic field occurs at the electric power reception unit  220  is detected using a Hall IC or a reed switch may be also possible.