Patent Publication Number: US-2023152034-A1

Title: Indication device for a refrigerator and refrigerator

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority, under 35 U.S.C. § 119, of Chinese Patent Application CN 202122812192.4, filed Nov. 17, 2021; the prior application is herewith incorporated by reference in its entirety. 
     FIELD AND BACKGROUND OF THE INVENTION 
     The invention relates to the field of household appliances, and in particular, to an indication device for a refrigerator and a corresponding refrigerator. 
     With the advancement of the intelligent technology, demands of users for refrigerators are no longer just the size of a storage space. Nowadays, people pay more attention to visual feeling of science and technology and use experience of refrigerators. 
     At present, a light source mounted in a refrigerator body is mainly used in the market to provide indicative illumination. When a user opens a door to take an item, an illumination lamp located in a storage chamber is turned on, and when the refrigerator door is closed, the illumination lamp is turned off. However, when the refrigerator door is not fully closed, the illumination light emitted from the storage chamber is generally weak and is not easily perceived from the outside, and therefore it is difficult for the user to confirm whether the refrigerator door is closed or not. In addition, when the user takes an item in a dark environment, due to the lack of corresponding illumination outside the refrigerator, it also brings inconvenience to daily operation of the user. 
     Under this background, it is proposed in the related art to respectively indicate the proximity of a human body and an open/closed state of the door through indicator lights of different colors or types. However, there are too many indicative elements on the front side of the refrigerator, which affects the overall appearance of the refrigerator; moreover, overlapping bright and dark states of multiple light sources also have higher requirements for the memory and operation familiarity of the user. Particularly, when the user completes a series of combined operations of approaching the refrigerator, opening and closing the door, and leaving the refrigerator, frequent bright and dark alternate display of lights of multiple colors easily confuse the user. 
     SUMMARY OF THE INVENTION 
     It is accordingly an object of the invention to provide an improved indication device for a refrigerator and a corresponding refrigerator, which overcome the hereinafore-mentioned disadvantages and solve at least some of the problems of the heretofore-known devices and refrigerators of this general type. 
     With the foregoing and other objects in view there is provided, in accordance with a first aspect of the invention, an indication device for a refrigerator, the indication device comprising:
         an indicator light or a plurality of indicator lights indicating synchronously; a first detection unit configured to detect an object activity situation around the refrigerator;   a second detection unit configured to detect an open/closed state of at least one door body of the refrigerator; and   a processor, the processor being communicatively connected to the first detection unit, the second detection unit, and the indicator light to be adapted to, according to detection results of the first detection unit and the second detection unit, control the indicator light to indicate in a first state or a second state, and the first state being different from the second state.       

     The invention mainly includes the following technical concept: it is proposed to comprehensively determine a final indication state of an indicator light through two detection signals, so as to avoid simultaneous appearance of different bright and dark effects of multiple light sources from confusing people. While the number of indicative elements and related indication states are simplified, user satisfaction is improved. 
     According to an optional embodiment of the invention, in a case that the first detection unit detects that an object enters a determination range around the refrigerator and the second detection unit detects that all door bodies of the refrigerator are closed, the indicator light indicates in the first state, and in a case that the second detection unit detects that the at least one door body of the refrigerator is open, the indicator light indicates in the second state. Therefore, it is fully ensured that two key states “a human body approaches the refrigerator and the refrigerator door is not closed” can be visually and reliably distinguished through one indicator light. In addition, even if the human body approaches the refrigerator in a case that the refrigerator door is open, the indicator light would not be switched from the second state back to the first state, which helps to continuously indicate, to the outside, that the refrigerator door is not yet closed, so that the user can perceive the information and perform related processing in a timely fashion. 
     According to an optional embodiment of the invention, in a case that the second detection unit detects that the at least one door body of the refrigerator is changed from an opened state to a closed state until all the door bodies are closed, the indicator light indicates in the first state. In this way, the switching of the indication states advantageously conveys, to the user, information “the refrigerator is changed from an opened state to a closed state”, so as to interact with the user. 
     According to an optional embodiment of the invention, the indicator light is always ON in the first state and the indicator light dynamically indicates in the second state, or the indicator light dynamically indicates in the first state and the indicator light is always ON in the second state. Here, the circular breathing effect is simulated through the dynamic indication state, so as to show a natural sense of life, so that visual fatigue and discomfort of directly illuminating eyes brought to the user are reduced when the user observes the indicator light. 
     According to an optional embodiment of the invention, the processor includes a timer and a delay trigger circuit, the timer is configured to be adapted to record a first duration when the indicator light indicates in the first state and/or a second duration when the indicator light indicates in the second state, the delay trigger circuit is configured to, according to the first duration and/or the second duration, control the indicator light to indicate in a third state, and the third state is different from the first state and the second state. Therefore, automatic state restoration of the indicator light is realized by monitoring the duration. On one hand, it is ensured that the indication effect is fully sensed by the user, and on the other hand, energy consumption is also saved to some extent. 
     According to an optional embodiment of the invention, the indication device further includes a switch for controlling disabling and enabling of the first detection unit. In this way, the user can flexibly select disabling and enabling of a proximity function according to requirements, so as to provide the user with the possibility of saving energy consumption. 
     According to an optional embodiment of the invention, the first detection unit is configured as a radar sensor, and the radar sensor has a fan-shaped detection range with a radiation radius of 2 m to 3 m. Due to the radiation principle characteristics of the radar sensor, the detection range of a large angle is provided, and the proximity detection sensitivity of the human body is improved. 
     According to an optional embodiment of the invention, the second detection unit includes a magneto-sensitive sensor. Thus, the proximity detection of the door body and the refrigerator body is realized in a simple manner. 
     With the objects of the invention in view, there is also provided, according to a second aspect of the invention, a refrigerator, comprising a refrigerator body, a door body, and the indication device according to the foregoing embodiment, the indication device being disposed on the refrigerator body and/or the door body. 
     According to an optional embodiment of the invention, an external decorative surface of an indicator light of the indication device is disposed obliquely outward relative to the refrigerator body of the refrigerator. This arrangement caters to the line of sight of an operator, and the indicator light can be visually observed more easily. 
     According to an optional embodiment of the invention, the door body has a handle groove structure at an edge of an opening and closing side, and at least one indicator light of the indication device is disposed in the handle groove structure of the door body and extends along a length direction of the handle groove structure. Therefore, basic illumination of an operation area near the handle of the refrigerator door is realized, which is convenient for a user to confirm a position of the handle when approaching in a dark environment. 
     According to an optional embodiment of the invention, the at least one indicator light includes an LED lamp body and at least a partially light-transmissive lamp cover, the LED lamp body is embedded in the handle groove structure of the door body, and the lamp cover covers the LED lamp body. Through the use of the embedded arrangement of the lamp body in the handle groove structure and through the sealing of the lamp cover, the overall appearance of the refrigerator is not affected. 
     According to an optional embodiment of the invention, the handle groove structure includes a first side wall, a second side wall opposite to the first side wall, and a transition portion connecting the first side wall and the second side wall, the first side wall is provided with an accommodating portion on a surface opposite to the second side wall, and the accommodating portion is configured to be adapted to fit the LED lamp body to allow the LED lamp body to be embedded in the first side wall of the handle groove structure. Through the use of the concealed design of the LED lamp body on the inner wall of the handle groove, the indicator light does not protrude from a refrigerator panel, thereby achieving a simple and beautiful overall appearance. 
     According to an optional embodiment of the invention, an indicative identifier is hollowed, for example indented or cut-out, on a position of the lamp cover covering the LED lamp body. Thus, the indicator light has a content transfer value in addition to the basic indicative function. 
     According to an optional embodiment of the invention, the indicative identifier includes text and/or a pattern representing a function of at least one operation partition of the refrigerator. Therefore, a special working state of the refrigerator can be reflected, and a main function of an operation partition where the indicator light is located can also be described, thereby realizing maximization of information acquisition in a simple manner. 
     Other features which are considered as characteristic for the invention are set forth in the appended claims. 
     Although the invention is illustrated and described herein as embodied in an indication device for a refrigerator and a refrigerator, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims. 
     The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         FIG.  1    is a structural block diagram of an indication device according to an exemplary embodiment of the invention; 
         FIG.  2    is a schematic diagram of an operation principle of an indication device according to an exemplary embodiment of the invention; 
         FIGS.  3 A  to  FIG.  3 D  are schematic diagrams of different indication states of an indicator light in one exemplary operation scenario; 
         FIG.  4    is a stereoscopic view of a refrigerator according to an exemplary embodiment of the invention; 
         FIG.  5    is a stereoscopic view of a drawer-type door body equipped with an indicator light according to an exemplary embodiment of the invention; 
         FIG.  6    is a stereoscopic view of the drawer-type door body shown in  FIG.  5    having an LED lamp body embedded therein and not yet covered by a lamp cover; 
         FIG.  7    is an exploded view of a handle of the drawer-type door body shown in  FIG.  5   ; 
         FIG.  8    is a partial cross-sectional view of a portion B of  FIG.  5    taken along a section line A-A; and 
         FIG.  9    is a partial enlarged view of the drawer-type door body shown in  FIG.  5    when an indicator light is always ON. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In order to make the technical problems, technical solutions, and beneficial technical effects to be solved by the invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and a plurality of exemplary embodiments. It is to be understood that the specific embodiments described herein are only used to explain the invention, and are not intended to limit the scope of protection of the invention. 
     It is to be understood that, in this description, the expressions “first,” “second,” “third” and the like are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance, and cannot be understood as implicitly indicating the number of indicated technical features, either. 
     Referring now to the figures of the drawings in detail and first, particularly, to  FIG.  1    thereof, there is seen a structural block diagram of an indication device  10  according to an exemplary embodiment of the invention. It can be seen from  FIG.  1    that the indication device  10  includes a first detection unit  110 , a second detection unit  120 , a processor  130 , and a plurality of indicator lights  140 ,  141 ,  142 , and  143  operating synchronously. In the sense of the invention, “synchronous operation” means that the plurality of indicator lights  140 ,  141 ,  142 , and  143  have a same indication state at any time, and are switched from one state to the other state synchronously. It is also to be understood that although the indication device  10  is shown in this example as including the plurality of indicator lights  140 ,  141 ,  142 , and  143 , the indication device  10  may also only include one indicator light  140 . 
     The first detection unit  110  is configured to, for example, detect an object activity situation around a refrigerator. Here, the object activity situation around the refrigerator especially includes: an object enters a determination range around the refrigerator, and the object leaves the determination range around the refrigerator. As an example, the first detection unit  110  may be configured as a radar sensor, and the radar sensor has a fan-shaped detection range with a radiation radius of 2 m to 3 m. 
     The second detection unit  120  is configured to, for example, detect an open/closed state of at least one door body of the refrigerator. As an example, the second detection unit  120  may be configured as a magneto-sensitive sensor, and provides a detection result in the form of an electrical signal only when all the door bodies are detected to be closed. 
     As shown in  FIG.  1   , the processor  130  is connected to the first detection unit  110 , the second detection unit  120 , and the indicator lights  140 ,  141 ,  142  and  143 , respectively, so as to control, according to detection results of the first detection unit  110  and the second detection unit  120 , the indicator lights  140 ,  141 ,  142 , and  143  to synchronously indicate in a first state or a second state. The first state is different from the second state. As an example, the indicator lights  140 ,  141 ,  142 , and  143  are all, for example, always ON in the first state, the indicator lights  140 ,  141 ,  142 , and  143  dynamically indicate in the second state (e.g., a gradient bright-dark alternate change), and vice versa. Here, the breathing frequency and the luminous intensity of the indicator lights  140 ,  141 ,  142 , and  143  in the dynamically indicated state are consistent, and the luminous intensity “during breathing” may be lower than, for example, the luminous intensity in the “always-ON” state. 
     In the embodiment shown in  FIG.  1   , the processor  130  may further include, for example, a timer  131  and a delay trigger circuit  132  connected to each other. The timer  131  is configured to record a first duration when the indicator lights  140 ,  141 ,  142 , and  143  indicate in the first state and/or a second duration when the indicator lights  140 ,  141 ,  142 , and  143  indicate in the second state. The delay trigger circuit  132  is configured to, for example, compare the first duration or the second duration with a predefined time threshold, and control, according to a comparison result, the indicator lights  140 ,  141 ,  142 ,  143  to be switched to a third state. Here, in the third state, the indicator lights  140 ,  141 ,  142 , and  143  are all turned off, for example. As another example, the timer  131  is further configured to, for example, record a third time period related to a detection result of the first detection unit  110  and/or a fourth time period related to a detection result of the second detection unit  120 . In this example, the delay trigger circuit  132  is further configured to, for example, delay triggering the control of the indicator lights  140 ,  141 ,  142 ,  143  according to the third time period and/or the fourth time period. Therefore, a duration of each operation action of a user can be taken into account, so that misoperation or false triggering is advantageously eliminated, and moreover, energy waste caused by frequent triggering is also avoided. For example, the timer  131  records the third time period from a time of entering a determination range around the refrigerator by the user to a time of leaving the determination range and sends the third time period to the delay trigger circuit  132 . The delay trigger circuit  132  determines, according to a corresponding comparison mechanism, that the third time period is less than a predefined third time threshold, which indicates that the user is likely to simply pass by the refrigerator without the intention of using the refrigerator. In this case, the delay trigger circuit  132  does not immediately trigger the indicator lights  140 ,  141 ,  142 , and  143  to indicate in the first state, but delays the trigger of the first state of the indicator lights  140 ,  141 ,  142 ,  143  a time period. 
     In addition, the indication device  10 , for example, further includes a switch  111  for controlling enabling and disabling of the first detection unit  110 , so that the indicator lights  140 ,  141 ,  142 , and  143  can be temporarily not turned on due to the proximity of a human body according to user requirements, thereby saving energy consumption. 
       FIG.  2    is a schematic diagram of an operation principle of an indication device according to an exemplary embodiment of the invention. 
     Here, three indication states  1001 ,  1002 , and  1003  and related switching operations of the indicator lights  140 ,  141 ,  142 , and  143  of the indication device  10  in  FIG.  1    are exemplarily shown. It can be seen that, in a case that the first detection unit  110  detects that an object enters a determination range around the refrigerator and the second detection unit  120  detects that all door bodies of the refrigerator are closed, the indicator lights  140 ,  141 ,  142 , and  143  indicate, for example, in the first state (e.g., always-ON). Here, in a case that the timer  131  of the processor  130  records that the first duration of the first state  1001  exceeds a predefined time threshold (e.g., 30 seconds), the delay trigger circuit  132  controls the indicator lights  140 ,  141 ,  142 , and  143  to be switched from the first state  1001  to the third state  1003  (e.g., turn-off). In a case that the second detection unit  120  detects that the at least one door body of the refrigerator is open, whether the indicator lights  140 ,  141 ,  142 , and  143  are in the first state  1001  or the third state  1003 , the indicator lights  140 ,  141 ,  142 , and  143  are all switched to the second state  1002  (here, for example, a breathing-type bright-dark alternate change). In addition, in a case that the second detection unit  120  detects that the refrigerator is changed from a state in which the at least one door body is open to a state in which all door bodies are closed, the indicator lights  140 ,  141 ,  142 , and  143  are switched from the second state  1002  back to the first state  1001 . 
     Herein, although it is shown in conjunction with this example that the indicator lights  140 ,  141 ,  142 , and  143  are always ON in the first state  1001  and dynamically indicate in the second state  1002 , the indicator lights  140 ,  141 ,  142 , and  143  may also dynamically indicate in the first state  1001  and be always ON in the second state  1002 . 
       FIG.  3   a    to  FIG.  3   d    are schematic diagrams of different indication states of an indicator light in one exemplary operation scenario. Exemplarily, one indicator light  140  of the indication device  10  in  FIG.  1    is exemplarily mounted on one of the door bodies  20  of the refrigerator. Here,  FIG.  3   a    to  FIG.  3   d    respectively show the indication state change of the indicator light  140  caused by the operation of the user and the opening and closing of the refrigerator door. 
       FIG.  3   a    shows a default turn-off state of the indicator light  140 . This default turn-off state is defined, for example, as a third state. For example, in a case that no user activity is detected around the refrigerator and the refrigerator doors are all closed, the indicator light  140  presents such an indication state. 
     Next, in  FIG.  3   b   , a user H, for example, approaches the refrigerator and desires to take an item from the refrigerator. In a case that the user H enters a determination range around the refrigerator, all the door bodies of the refrigerator are all in a closed state. Therefore, the first detection unit and the second detection unit respectively provide corresponding detection signals to the processor (not specifically shown), and the processor causes the first state “always-ON” of the indicator light  140  to be valid. As shown in  FIG.  3   b   , the indicator light  140  is changed from a turn-off state to an always-ON state. 
     Subsequently, in  FIG.  3   c   , the user operates the door body  20  of the refrigerator and opens same. In this case, the second detection unit, which is not shown, identifies the state change of the door body  20 , and then provides, to the processor, a detection signal indicating that the door body is open, so that the processor causes the indicator light  140  to “dynamically indicate” in the second state. Here, the indicator light  140  presents, for example, a gradient bright-dark alternate change, to yield a breathing effect. As an example, the brightness of the indicator light  140  when turned on is, for example, lower than the brightness in the first state. 
     In  FIG.  3   d   , the user closes the door body  20  of the refrigerator after use. The second detection unit detects that the operation of the user causes the refrigerator door bodies to be changed from an opened state to a closed state, and thus, the second detection unit sends the signal to the processor. The processor restores the indicator light  140  to the first state “always-ON” as shown in  FIG.  3   d   . However, such an always-ON state lasts, for example, only for a predefined time period (e.g., 30 seconds). After the predefined time period runs out, the indicator light  140  reenters the third state (i.e., turn-off). 
       FIG.  4    is a stereoscopic view of a refrigerator according to an exemplary embodiment of the invention. 
     As shown in  FIG.  4   , the refrigerator is a side-by-side refrigerator. 
     Before detailed description is started, the directional terminologies used in the description is for a conventional use state of the refrigerator and is for ease of description and cannot be understood as an absolute definition of the corresponding features. 
     It can be seen from  FIG.  4    that the refrigerator  1  includes a refrigerator body  30 , two side-hung type door bodies  21  mounted on the refrigerator body  30 , and two drawer-type door bodies  20 . The two side-hung type door bodies  21  are pivotally connected to opposite sides of the refrigerator body  30 , so that an operation space therein may be opened or closed in a left-right pivoting manner. The two drawer-type door bodies  20  are disposed side by side below the side-hung type door bodies  21  along a height direction of the refrigerator, and may be pushed back and forth along a depth direction of the refrigerator  1  to open or close a corresponding operation space. Here, the operation spaces defined by the door bodies  20  and  21  and the refrigerator body  30  may be configured as a refrigerating chamber, a freezing chamber, and a variable temperature chamber according to the specific type of the refrigerator. A person skilled in the art will appreciate that the invention is also applicable to other types of refrigerators, such as a separate refrigerating machine or freezer. In addition, according to needs, the invention may also be applied to other household refrigeration appliances other than refrigerators, such as wine cabinets. 
     Here, the refrigerator  1  further includes the indication device  10  shown in  FIG.  1   , and the indication device  10  is disposed on the refrigerator body  30  and/or the door bodies  20  and  21 . One possible arrangement mode of components of the indication device  10  on the refrigerator  1  is exemplarily illustrated by dashed boxes in  FIG.  4   . In the exemplary embodiment, the first detection unit  110  is disposed on a front surface of one door body  21  of the refrigerator  1  to detect an object activity situation within a determination range (for example, 2-3 meters) around the refrigerator  1 . The second detection unit  120  includes, for example, sensing portions and trigger portions. The sensing portions are, for example, disposed at left and right edges of an opening and closing side of the drawer-type door body  20  of the refrigerator  1 , and the trigger portions are, for example, disposed at corresponding positions of the refrigerator body  30  of the refrigerator  1 , and vice versa. When the drawer-type door bodies  20  of the refrigerator  1  are closed, the trigger portions of the second detection unit  120  are closely opposite to the associated sensing portions, respectively. The indicator light  140  of the indication device  10  is, for example, disposed in a handle groove structure  210  of the drawer-type door body  20  and exposed from the front surface of the refrigerator  1 , so as to be able to be observed by a user standing in front of the refrigerator  1  when the indicator light  140  is turned on. In this example, one indicator light  140  is provided in the handle groove structure  210  of each drawer-type door body  20 , respectively. Here, the first detection unit  110 , the second detection unit  120 , and the indicator lights  140  are all, through wiring harnesses (not shown), connected to the processor  130  disposed at the top of the refrigerator body  30 . 
       FIG.  5    is a stereoscopic view of a drawer-type door body equipped with an indicator light according to an exemplary embodiment of the invention. 
       FIG.  6    is a stereoscopic view of the drawer-type door body shown in  FIG.  5    having an LED lamp body embedded therein and not yet covered by a lamp cover. 
     It can be seen from  FIG.  5    to  FIG.  6    that the drawer-type door body  20  of the refrigerator  1  has an embedded handle groove structure  210  at an edge of an opening and closing side (or a top). In  FIG.  5   , the indicator light  140  has been disposed in the handle groove structure  210  and disposed to extend along a length direction of the handle groove structure  210 . Since the LED lamp body has been covered by the lamp cover of the indicator light  140 , the LED lamp body cannot be directly observed from the outside through the lamp cover. The LED lamp body  1410  exposed from the handle groove structure  210  can be seen in  FIG.  6   . 
       FIG.  7    is an exploded view of a handle of the drawer-type door body shown in  FIG.  5   . As shown in  FIG.  7   , the handle groove structure  210  includes a first side wall  2101 , a second side wall  2102  opposite to the first side wall  2101 , and a transition portion  2103  connecting the first side wall  2101  and the second side wall  2102 . In a case that the drawer-type door body  20  is closed, the first side wall  2101  is, for example, closer to the refrigerator body of the refrigerator than the second side wall  2102 . In addition, the handle groove structure  210  further includes an end surface  2104 , and the end surface  2104  is connected to the transition portion  2103  through the first side wall  2101  in the form of an inclined surface. 
     Here, an upper edge of the second side wall  2102  is lower than the first side wall  2101  as viewed from the front surface of the refrigerator  1  toward the operation space, so that the first side wall  2101  is partially exposed from the handle groove structure  210 . Also, the first side wall  2101  is provided with an accommodating portion  2110  in the form of an opening on a surface opposite to the second side wall  2102  and is therefore adapted to fit the LED lamp body  1410  to allow the LED lamp body  1410  to be embedded in the first side wall  2101 . In the embedded state, an outer surface of the LED lamp body  1410  is flush with, for example, a surface of the first side wall  2101  facing the second side wall  2102 . Here, it can also be seen that a housing of the LED lamp body  1410  has a protrusion at a bottom, and the function of the protrusion is pre-positioning the LED lamp body  1410  in the handle groove structure  210  prior to sealing of the lamp cover  1411 . In order to make the LED lamp body  1410  and the associated wiring harness not directly exposed from the surface of the first side wall  2101  and be observed by the user, they are covered by the lamp cover  1411 . As an example, the lamp cover  1411  is formed in a plate shape and is adapted to a length and a width of the first side wall  2101  of the handle groove structure  210  along a length and width direction. 
       FIG.  8    is a partial cross-sectional view of a portion B of  FIG.  5    taken along a section line A-A. 
     It can be seen that the first side wall  2101  and the second side wall  2102  of the handle groove structure  210  are connected to each other through the transition portion  2103 , and the first side wall  2101  and the second side wall  2102  are respectively engaged into corresponding recesses of the remainder of the door body  20  through bottom protruding structures for fixing. In addition, since the LED lamp body  1410  is positioned according to an inclination angle of the first side wall  2101 , after the lamp cover  1411  covers the LED lamp body  1410 , an external decorative surface of the lamp cover  1411  is also disposed obliquely outward relative to the refrigerator body  30  of the refrigerator  1 , thereby catering to the line of sight of the user, and facilitating being observed more easily. 
       FIG.  9    is a partial enlarged view of the drawer-type door body shown in  FIG.  5    when an indicator light indicates in an always-ON state. In the first state, since an indicative identifier  1413  is hollowed, for example indented or cut-out, on a position of the lamp cover  1411  covering the LED lamp body (the indicator identifier is, for example, text or a pattern representing a function of an operation space), when the LED lamp body is turned on, light will be transmitted through a hollow portion to present a text effect. 
     Although the specific embodiments have been described above, these embodiments are not intended to limit the scope of the invention, even if only a single embodiment is described with respect to a particular feature. Examples of features provided in the invention are intended to be illustrative and not restrictive, unless different statements are made. In particular implementations, multiple features may be combined with each other in a technically feasible case, depending on actual requirements. Various substitutions, alterations, and modifications may also be conceived without departing from the spirit and scope of the invention.