Light-emitting rotary knob and electric appliance device with light-emitting rotary knob

Abstract

The utility model discloses a light-emitting knob and an electrical device with the light-emitting knob, the light-emitting knob comprises a knob body, the knob body comprises a panel part fixedly connected with an operation panel and a rotating part arranged at the upper part of the panel part, the panel part comprises a PCB (printed circuit board) and a light-emitting cover arranged outside the PCB, a control circuit is arranged on the PCB, and the light-emitting cover is connected with the control circuit. A magnetic sensing element and a plurality of LED lamps driven by the control circuit are arranged on the control circuit; the rotating part comprises a light guide cover, a positioning magnet is arranged on the light guide cover and corresponds to a magnetic induction element, the magnetic induction element inducts the rotating angle of the positioning magnet, the control circuit drives the LED lamp to emit different light rays, and the different light rays sequentially penetrate through the light emitting cover and the light guide cover to be emitted outwards. According to the utility model, the panel part and the rotating part are not electrically connected, so that the rotating part can rotate 360 degrees at will, and the danger of electric shock is avoided.

Description

Technical Field

[0001] The utility model relates to the field of electrical appliance accessories, in particular to a luminous knob and an electrical appliance device having the luminous knob. Background Art

[0002] As people's quality of life improves, users have higher and higher requirements for the operating experience of electrical products. Knobs are a type of switch and adjustment device widely used in electrical products. Traditional knobs used on electrical appliances have a single function and are only used as manual switches or manual adjustment parts. Some knobs are equipped with LED lights on the rotating part to facilitate the use of the knob in darker environments. However, these LED lights require the use of separate connecting wires, and the connecting wires are inside the rotating part of the knob and easily entangled during the rotation process, making it impossible to achieve 360° rotation. At the same time, since the rotating part of the knob is equipped with connecting wires, there is a risk of electric shock when the rotating part is manually rotated. Utility Model Content

[0003] The purpose of the present utility model is to overcome the defects of the prior art that the knob cannot be rotated 360° freely and is prone to electric shock. The utility model provides a luminous knob and an electrical device having the luminous knob. The panel part of the knob is provided with an LED light and a connecting wire. At the same time, there is no electrical connection between the panel part and the rotating part, so that the rotating part can be rotated 360° freely without the risk of electric shock.

[0004] To achieve the above-mentioned objectives, the present invention provides an luminous knob, comprising a knob body, the knob body comprising a panel portion fixedly connected to an operating panel and a rotating portion mounted on the upper portion of the panel portion, the panel portion comprising a PCB board and a luminous cover mounted outside the PCB board, the PCB board being provided with a control circuit, the control circuit being provided with a magnetic sensing element and a plurality of LED lamps driven by the control circuit; the rotating portion comprising a light guide cover, the light guide cover being provided with a positioning magnet, the positioning magnet corresponding to the magnetic sensing element, the magnetic sensing element sensing the rotation angle of the positioning magnet, so that the control circuit drives the LED lamp to emit different light rays, and the different light rays pass through the luminous cover and the light guide cover in turn and are emitted outward.

[0005] Preferably, the knob body further includes a base portion, the base portion is mounted on the inner side of the operating panel, the panel portion is mounted on the outer side of the operating panel, and the base portion, the operating panel and the panel portion are fixedly connected together.

[0006] As preferred, the middle part of the light guide cover is provided with a receiving hole, the base part is further provided with a rotating extension shaft, the rotating extension shaft is sequentially inserted through the operation plate, the panel part and the receiving hole on the light guide cover; the receiving hole is provided with an elastic sheet in contact with the rotating extension shaft, the elastic sheet is deformed to tightly press the rotating extension shaft inside the receiving hole.

[0007] As preferred, the PCB is provided with a connecting line, the connecting line is connected with the power supply through the operation plate to provide power for the control circuit, and then the LED light is lightened.

[0008] As preferred, one side of the receiving hole is provided with a positioning column, the end of the positioning column is provided with a positioning hole for receiving a positioning magnet, and the positioning magnet is tightly matched with the positioning hole.

[0009] As preferred, the panel part further comprises a bottom decorative ring, the bottom of the PCB is provided with a protective bottom plate, the protective bottom plate and the light emitting cover fix the PCB inside, and are fixed and bonded together through the three-proofing glue; the bottom decorative ring and the light emitting cover are fixed through the first buckle.

[0010] As preferred, the bottom decorative ring is arranged on one side of the operation plate, the light emitting cover is provided with a bolt hole, the bolt hole is internally provided with a bolt, and the bolt fixes the panel part on the operation plate.

[0011] As preferred, the rotating part further comprises a rotary knob light shielding shell inserted outside the light guide cover; the light guide cover is provided with a plurality of insertion grooves, the rotary knob light shielding shell is internally provided with vertical protrusions matched with the insertion grooves, the rotary knob light shielding shell is externally provided with a vertical stripe for increasing rotary friction, the rotary knob light shielding shell shields the side of the light guide cover, and the bottom and the top of the light guide cover emit light outward.

[0012] As preferred, the rotating part further comprises a top cover arranged on the top of the light guide cover, the light guide cover is provided with a first receiving groove for receiving the top cover, the first receiving groove is internally provided with a plurality of insertion grooves, the top cover is inserted into the insertion grooves and is fixed and connected through the second buckle; the first receiving groove is internally provided with an indicating protrusion, the top cover is provided with a second receiving groove for receiving the indicating protrusion, the top cover shields the top of the light guide cover, the indicating protrusion emits light outward through the top cover; the upper surface of the top cover is provided with a DC pattern.

[0013] The utility model further provides an electric appliance device, the electric appliance device includes above described a kind of light-emitting rotary knob.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] 1. The utility model discloses a PCB board with LED lamp and control circuit is installed in the panel part, with operating board fixed connection, need not move and rotate, so that the internal connecting wire does not occur winding, further, the light cover is equipped with the positioning magnet, the positioning magnet corresponds with the magnetic force induction element, starts control circuit, wherein, the magnetic force induction element passes through the induction magnetic force size, thereby the rotation angle of positioning magnet is obtained, makes control circuit drive LED lamp and emit different light, still further, the LED lamp sets up in the panel part, in order to better guide light to the rotating part, the light cover and light cover are all light -transmitting material, and the light ray is in turn through light cover and light cover and emits outward, thereby making the panel part and rotating part all emit light outward, obtains the light emitting knob;

[0016] 2. The utility model discloses panel part and rotating part between adopt magnetic connection, use positioning magnet drive control circuit, make control circuit start or drive LED lamp and emit different light, the rotating part with panel part only exist spatial magnetic connection, do not carry out direct connection, thereby rotating part can rotate 360 with the heart, further, rotating part only has placed positioning magnet, does not exist electric connection, thereby will not appear the danger of electric shock. ACCURACY

[0017] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the drawing needed to use in the embodiment or prior art description simple introduction, obviously, the drawing in the following description is some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, can also obtain other drawings according to these drawings.

[0018] Figure 1 It is the front structure schematic drawing of the electric appliance device provided by the utility model;

[0019] Figure 2 It is Figure 1 The sectional view of the light emitting knob in

[0020] Figure 3 It is the structure schematic drawing of the base part of the knob body provided by the utility model;

[0021] Figure 4 It is the exploded view of the rotating part of the knob body provided by the utility model;

[0022] Figure 5 It is the bottom exploded view of the rotating part of the knob body provided by the utility model;

[0023] Figure 6 It is the exploded view of the panel part of the knob body provided by the utility model;

[0024] Figure 7 This is a front structural diagram of the knob body provided by the utility model;

[0025] Figure 8 It is a schematic diagram of the bottom structure of the knob body provided by the utility model.

[0026] Included in the diagram are:

[0027] 1. Knob body; 2. Operation panel; 11. Panel part; 12. Rotating part; 20. PCB board; 3. Light-emitting cover; 22. LED light; 4. Light guide cover; 5. Positioning magnet; 13. Base part; 41. Receiving hole; 131. Rotating extension shaft; 411. Shrapnel; 21. Connecting wire; 42. Positioning column; 43. Positioning hole; 6. Bottom decorative ring; 7. Protective bottom plate; 8. First buckle; 31. Bolt hole; 9. Knob light-shielding shell; 49. Slot; 91. Vertical protrusion; 92. Vertical stripe; 10. Top cover; 44. First receiving slot; 45. Insertion slot; 46. Second buckle; 47. Indicating protrusion; 48. Second receiving slot. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in this embodiment of the present invention to clearly and completely describe the technical solution in this embodiment of the present invention. Obviously, the embodiment described is only one embodiment of the present invention, not all embodiments of the present invention. Based on this embodiment of the present invention, all other embodiments of the present invention obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this utility model.

[0029] Example 1

[0030] Please refer to Figures 1 to 8 , the utility model provides a luminous knob.

[0031] like Figure 2 As shown, the luminous knob includes a knob body 1, and the knob body 1 includes three parts, one of which is a base part 13 fixedly connected to the operation panel 2 and installed at the lower part of the operation panel 2, another part is a panel part 11 fixedly connected to the operation panel 2 and installed at the upper part of the operation panel 2, and the last part is a rotating part 12 installed at the upper part of the panel part 11.

[0032] Furthermore, the base portion 13 , the operating panel 2 and the panel portion 11 are fixedly connected together; the rotating portion 12 is fixedly connected to the base portion 13 and is not in contact with the panel portion 11 .

[0033] Furthermore, the base part 13 can be an energy switch, which is connected to the circuit to control the shutdown of the circuit and the size of the circuit current; the base part 13 can also be a gas valve switch, which is connected to the gas circuit to control the shutdown of the gas circuit and the size of the gas circuit opening.

[0034] like Figure 2 As shown, the panel portion 11 includes a PCB 20 and a light-emitting cover 3 mounted on the exterior of the PCB 20. The PCB 20 is provided with a control circuit, which is equipped with a magnetic sensor and a plurality of LED lights 22 driven by the control circuit. The control circuit drives the LED lights 22 to emit different light patterns, including white and red light. In other embodiments, the LED lights 22 can also emit purple light or even color-changing light, achieving a gradual change from white light to red light.

[0035] like Figure 5 As shown, the rotating part 12 includes a light guide cover 4, and a positioning magnet 5 is provided on the light guide cover 4. The positioning magnet 5 is eccentrically arranged, and the positioning magnet 5 corresponds to the magnetic sensing element. At the origin, the positioning magnet 5 coincides with the magnetic sensing element. At this time, the magnetic force sensed by the magnetic sensing element is the strongest. As the rotating part 12 rotates together with the positioning magnet 5, the magnetic force sensed by the magnetic sensing element gradually weakens. In this way, the magnetic sensing element senses the rotation angle of the positioning magnet 5, so that the control circuit drives the LED lamp 22 to emit different light. For example, at the origin, the LED lamp 22 emits white light; when the positioning magnet 5 is completely separated from the magnetic sensing element, the LED lamp 22 emits red light; in this embodiment, when the positioning magnet 5 is not completely separated from the magnetic sensing element, the LED lamp 22 also emits white light; that is: in this embodiment, as long as the magnetic sensing element can sense the magnetic force, the LED lamp 22 emits white light; as long as the magnetic sensing element cannot sense the magnetic force, the LED lamp 22 emits red light.

[0036] In other embodiments, free settings can also be made, for example: at the origin, the LED lamp 22 emits white light; when the positioning magnet 5 rotates, as long as the magnetic sensing element can sense the magnetic force, the LED lamp 22 emits a gradient light, and the light changes with the change of the rotation angle of the positioning magnet 5, for example, the white light gradually becomes darker; when the positioning magnet 5 leaves the area of ​​the magnetic sensing element, the magnetic sensing element cannot sense the magnetic force, and the LED lamp 22 emits red light.

[0037] like Figure 2As shown, the LED lamp 22 is arranged on the panel part 11. In order to better guide the light to the rotating part 12, the light-emitting cover 3 and the light-guiding cover 4 are both made of light-transmitting materials. The light passes through the light-emitting cover 3 and the light-guiding cover 4 in turn and is emitted outward, so that the panel part 11 and the rotating part 12 both emit light outward, thereby obtaining a light-emitting knob.

[0038] like Figure 4 As shown, the middle portion of the light guide cover 4 is provided with a receiving hole 41; Figure 3 As shown, the base portion 13 is also provided with a rotating protruding shaft 131, and the rotating protruding shaft 131 passes through the operation panel 2 and the panel portion 11 in sequence and is plugged into the accommodating hole 41 on the light guide cover 4; in this embodiment, the light guide cover 4 controls the base portion 13 through shaft linkage (mechanical linkage); further, the accommodating hole 41 is provided with a spring piece 411 in contact with the rotating protruding shaft 131, and the spring piece 411 is deformed to press the rotating protruding shaft 131 tightly against the inside of the accommodating hole 41, thereby fixing the base portion 13 and the light guide cover 4 together to achieve synchronous movement.

[0039] In other embodiments, the magnetic sensing element is electrically connected to the base portion 13 to achieve magnetic linkage (electrical linkage). The rotation of the positioning magnet 5 is fed back by the magnetic sensing element, and the rotation of the light guide cover 4 is indirectly obtained, which can also achieve synchronous movement.

[0040] like Figure 6 As shown, the PCB 20 is provided with a connecting wire 21. The connecting wire 21 passes through the operating panel 2 and is connected to the power supply, providing power to the control circuit, thereby illuminating the LED 22. Furthermore, the connecting wire 21 passes through the central hole of the PCB 20 and is connected to the power supply or the base portion 13, and does not have any connection or contact with the rotating portion 12, thereby eliminating the risk of electric shock.

[0041] like Figure 5 As shown, a positioning post 42 is provided on one side of the receiving hole 41. The positioning post 42 is preferably eccentrically arranged. A positioning hole 43 is provided at the end of the positioning post 42 to accommodate the positioning magnet 5. The positioning magnet 5 is tightly fitted into the positioning hole 43. In other embodiments, glue may be applied between the positioning magnet 5 and the positioning hole 43 to ensure more stable installation of the positioning magnet 5.

[0042] like Figure 6 and Figure 8As shown, the panel part 11 further comprises a bottom decorative ring 6, which can play a decorative role for the light-emitting knob mounting position, so that the light-emitting knob is more beautiful, and the internal connecting wire 21 and hole position can be shielded; the PCB board 20 is fixed inside by the protective bottom plate 7 and the light-emitting cover 3, and is fixed and bonded together by the three-proofing glue; the bottom decorative ring 6 and the light-emitting cover 3 are fixed by the first buckle 8, so as to be assembled into an integral whole, and form a complete panel part 11.

[0043] As shown in the figure, Figure 6 The bottom decorative ring 6 is arranged on one side of the operation plate 2, the light-emitting cover 3 is provided with a bolt hole 31, the bolt hole 31 is internally provided with a bolt, and the panel part 11 is fixed on the operation plate 2 by the bolt; during assembly, the assembly is segmented, and the panel part 11 can be fixed on the operation plate 2 by only tightening the bolt.

[0044] As shown in the figure, Figure 4 The rotating part 12 further comprises a knob light-shielding shell 9 inserted outside the light guide cover 4; the light guide cover 4 is provided with a plurality of insertion grooves 49, the knob light-shielding shell 9 is internally provided with a vertical protrusion 91 matched with the insertion grooves 49, and the knob light-shielding shell 9 is externally provided with a vertical stripe 92 for increasing the rotating friction; the knob light-shielding shell 9 is made of light-shielding material, and the side surface of the light guide cover 4 is light-shielded, and the bottom and top of the light guide cover 4 emit light outward.

[0045] As shown in the figure, Figure 4 The rotating part 12 further comprises a top cover 10 arranged at the top of the light guide cover 4, the light guide cover 4 is provided with a first containing groove 44 for containing the top cover 10, the first containing groove 44 is internally provided with a plurality of insertion grooves 45, the top cover 10 is inserted into the insertion grooves 45, and is fixedly connected by a second buckle 46.

[0046] As shown in the figure, Figure 4 The first containing groove 44 is internally provided with an indicating protrusion 47, and the top cover 10 is provided with a second containing groove 48 for containing the indicating protrusion 47, as shown in the figure, Figure 7 The top cover 10 is made of light-shielding material, and the top of the light guide cover 4 is light-shielded, and the indicating protrusion 47 emits light outward through the top cover 10; the upper surface of the top cover 10 is provided with a DC pattern.

[0047] Further, the upper surface of the top cover 10 can also be provided with decorative graphics; the side surface of the knob light-shielding shell 9 is provided with gear mark symbols.

[0048] In the embodiment, the light emitted by the LED lamp 22 passes through the light-emitting cover 3 and the light guide cover 4 in sequence and is emitted outward, and the bottom of the light guide cover 4 emits light outward; the light guide cover 4 is arranged between the light-emitting cover 3 and the bottom decorative ring 6, so that the light-emitting cover 3 and the bottom decorative ring 6 emit light outward and form a circular ring of light; the top of the light guide cover 4 also emits light outward; the top cover 10 blocks light from the top of the light guide cover 4, so that the top cover 10 and the rotary knob light-shielding shell 9 emit light outward and form a circular ring of light; the indicating protrusion 47 passes through the top cover 10 and emits light outward, serving as rotary indicating light.

[0049] The assembling steps of the light-emitting rotary knob;

[0050] Step S1: Assemble the panel part 11, and arrange the protective bottom plate 7 、 The PCB board 20 and the light-emitting cover 3 are sequentially bonded together; the bottom decorative ring 6 and the light-emitting cover 3 are fixed by the first buckle 8, so as to form a complete panel part 11;

[0051] Step S2: The panel part 11 is fixedly connected with the operation plate 2, a bolt is arranged in the bolt hole 31, and the panel part 11 is fixed on the operation plate 2 by screwing the bolt;

[0052] Step S3: The base part 13 is fixedly connected with the operation plate 2, the base part 13 is arranged at the bottom of the operation plate 2 and is fixedly connected with the operation plate 2 by a bolt, and the base part 13 is also provided with a rotary extension shaft 131, which passes through the operation plate 2 and the panel part 11 in sequence and extends outward;

[0053] Step S4: Assemble the rotary part 12, bond the positioning magnet 5 in the positioning hole 43, insert the rotary knob light-shielding shell 9 outside the light guide cover 4, the vertical protrusion 91 is matched with the insertion slot 49, insert the top cover 10 into the insertion slot 45 and fix the same by the second buckle 46, and meanwhile, the indicating protrusion 47 is placed in the second accommodating slot 48;

[0054] Step S5: The accommodating hole 41 on the light guide cover 4 is inserted on the rotary extension shaft 131, the accommodating hole 41 is provided with an elastic sheet 411 in contact with the rotary extension shaft 131, the elastic sheet 411 is deformed to tightly press the rotary extension shaft 131 in the accommodating hole 41, so as to fixedly connect the base part 13 and the light guide cover 4 and realize synchronous movement.

[0055] The operation steps of the light-emitting knob are as follows: rotating the knob light-shielded shell 9, when the positioning magnet 5 corresponds to the magnetic force sensing element, the LED lamp 22 emits white light; when the positioning magnet 5 does not completely separate from the magnetic force sensing element, the LED lamp 22 also emits white light; when the positioning magnet 5 completely separates from the magnetic force sensing element, the LED lamp 22 emits red light.

[0056] Embodiment two

[0057] Please refer to Figures 1 to 8 The utility model provides a kind of electric appliance device.

[0058] As Figure 1 Indicated, the electric appliance device includes the light-emitting knob described in embodiment one.

[0059] The electric appliance device includes but is not limited to: gas oven, gas stove, gas appliance such as water heater, kitchen appliance, electric oven, electric oven, washing machine and other electric appliances. The knob of the existing electric appliance device only has switching or adjusting function. The user needs to approach the electric appliance body to check the working state of the electric appliance, and cannot obtain the working state of the electric appliance through the knob. The knob does not have a prompt warning function for the user. The working state of the electric appliance device of the embodiment can be directly obtained by the user through the indicating protrusion 47 of the light-emitting knob. When the surrounding use environment is relatively dark, or the user is away from the electric appliance, the user can directly obtain the working state of the electric appliance device through the light-emitting state of the light-emitting knob.

[0060] The above embodiment is the preferred implementation manner of the utility model, but the implementation manner of the utility model is not limited by the above embodiment. Any change, modification, substitution, combination, simplification made without departing from the spirit and principle of the utility model should be an equivalent replacement manner, which is included in the protection scope of the utility model.

Claims

1. A luminous knob, characterized in that: The invention comprises a knob body (1), wherein the knob body (1) comprises a panel part (11) fixedly connected to an operating panel (2) and a rotating part (12) mounted on the upper part of the panel part (11), wherein the panel part (11) comprises a PCB board (20) and a light-emitting cover (3) mounted outside the PCB board (20), wherein the PCB board (20) is provided with a control circuit, wherein the control circuit is provided with a magnetic sensing element and a plurality of LED lights (22) driven by the control circuit; wherein the rotating part (12) comprises a light guide cover (4), wherein the light guide cover (4) is provided with a positioning magnet (5), wherein the positioning magnet (5) corresponds to the magnetic sensing element, wherein the magnetic sensing element senses the rotation angle of the positioning magnet (5), so that the control circuit drives the LED light (22) to emit different light rays, and the different light rays sequentially pass through the light-emitting cover (3) and the light guide cover (4) and are emitted outward.

2. The luminous knob according to claim 1, characterized in that: The knob body (1) further comprises a base portion (13), wherein the base portion (13) is mounted on the inner side of the operating panel (2), and the panel portion (11) is mounted on the outer side of the operating panel (2), wherein the base portion (13), the operating panel (2) and the panel portion (11) are fixedly connected together.

3. The luminous knob according to claim 2, characterized in that: The light guide cover (4) is provided with a receiving hole (41) in the middle thereof, and the base portion (13) is further provided with a rotating extension shaft (131). The rotating extension shaft (131) passes through the operation panel (2) and the panel portion (11) in sequence and is plugged into the receiving hole (41) on the light guide cover (4); the receiving hole (41) is provided with a spring piece (411) in contact with the rotating extension shaft (131), and the spring piece (411) is deformed to press the rotating extension shaft (131) tightly against the inside of the receiving hole (41).

4. The luminous knob according to claim 1, characterized in that: The PCB board (20) is provided with a connecting line (21), and the connecting line (21) passes through the operating panel (2) and is connected to the power supply to provide power to the control circuit, thereby lighting the LED lamp (22).

5. The luminous knob according to claim 3, characterized in that: A positioning column (42) is provided on one side of the accommodating hole (41), and a positioning hole (43) for accommodating a positioning magnet (5) is provided at the end of the positioning column (42), and the positioning magnet (5) is tightly matched with the positioning hole (43).

6. The luminous knob according to claim 1, characterized in that: The panel portion (11) further comprises a bottom decorative ring (6); a protective bottom plate (7) is mounted on the bottom of the PCB board (20); the protective bottom plate (7) and the luminous cover (3) fix the PCB board (20) inside and are fixed together by three-proof adhesive; the bottom decorative ring (6) and the luminous cover (3) are fixed by a first buckle (8).

7. The luminous knob according to claim 6, characterized in that: The bottom decorative ring (6) is installed on one side of the operating panel (2). The luminous cover (3) is provided with a bolt hole (31). Bolts are installed inside the bolt holes (31). The bolts fix the panel part (11) on the operating panel (2).

8. The luminous knob according to claim 1, characterized in that: The rotating part (12) further comprises a knob light-shielding housing (9) plugged into the outside of the light guide cover (4); a plurality of slots (49) are provided on the light guide cover (4); a vertical protrusion (91) matching the slots (49) is provided inside the knob light-shielding housing (9); a circle of vertical stripes (92) for increasing rotational friction is provided outside the knob light-shielding housing (9); the knob light-shielding housing (9) shields the side of the light guide cover (4); and light is emitted outward from the bottom and top of the light guide cover (4).

9. The luminous knob according to claim 1, characterized in that: The rotating part (12) further comprises a top cover (10) mounted on the top of the light guide cover (4); the light guide cover (4) is provided with a first receiving groove (44) for receiving the top cover (10); a plurality of insertion grooves (45) are provided inside the first receiving groove (44); the top cover (10) is inserted into the insertion grooves (45) and fixedly connected by a second buckle (46); an indication protrusion (47) is provided inside the first receiving groove (44); a second receiving groove (48) for receiving the indication protrusion (47) is provided on the top cover (10); the top cover (10) shields the top of the light guide cover (4); the indication protrusion (47) passes through the top cover (10) and emits light outward; and a DC pattern is provided on the upper surface of the top cover (10).

10. An electrical device, characterized in that: The electrical device comprises a luminous knob according to any one of claims 1 to 9.

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