Lighting device and cleaner including same

Abstract

Provided are a lighting device and a cleaner including same. The cleaner comprises: a cleaner head; and a lighting device that is positioned on one side of the cleaner head and has an optical center axis aligned at an angle in the range of 70 to 110 degrees with respect to the front direction of the cleaner head. The lighting device includes: an LED; and a lens having an inner space for accommodating the LED, wherein a light-emitting surface of the lens may be convex in a first direction and have a cross-section parallel with a second direction perpendicular to the first direction.

Description

Lighting device and vacuum cleaner including the same

[0001] The present disclosure relates to a lighting device and a cleaning device including the same.

[0002] Thanks to advancements in electronic technology, most households use various types of vacuum cleaners, such as robot vacuums and cordless vacuums. When using cordless or corded vacuums, users can clean with the vacuum head attached to the floor.

[0003] In this case, cleaning can be much easier if various foreign substances, such as dust or hair fallen on the floor surface, are visible to the naked eye. However, if the cleaning space is dark or the lights are off, it is difficult for the user to directly identify foreign substances on the floor surface with the naked eye.

[0004] To resolve these problems, a lighting device may be installed in the vacuum cleaner.

[0005] However, depending on the placement location or direction of the lighting device, there may be significant differences in the effectiveness of identifying foreign substances.

[0006] Therefore, there has been a need for technology that enables the easy identification of foreign substances when using lighting devices.

[0007] A vacuum cleaner according to at least one embodiment of the present disclosure comprises a vacuum cleaner head and a lighting device disposed on one side of the vacuum cleaner head and having a light center axis aligned at an angle ranging from 70 to 110 degrees with respect to the front of the vacuum cleaner head, wherein the lighting device comprises an LED and a lens having an internal space formed to accommodate the LED, and the light-emitting surface of the lens may be convex in a first direction and have a cross-section horizontal in a second direction perpendicular to the first direction.

[0008] A lighting device according to at least one embodiment of the present disclosure comprises an LED and a lens having an internal space formed therein for accommodating the LED, wherein the light-emitting surface of the lens is convex in a first direction and has a cross-section that is horizontal in a second direction perpendicular to the first direction, and the light-receiving surface facing the LED within the internal space of the lens may be concave in the first direction and convex in the second direction.

[0009] FIG. 1 is a drawing illustrating a vacuum cleaner according to at least one embodiment of the present disclosure.

[0010] FIG. 2 is an enlarged view of portion X of FIG. 1 according to at least one embodiment of the present disclosure.

[0011] FIG. 3 is a drawing showing the exterior of a vacuum cleaner according to at least one embodiment of the present disclosure.

[0012] FIG. 4 is a drawing showing the interior of a vacuum cleaner with some components removed according to at least one embodiment of the present disclosure.

[0013] FIG. 5 is a drawing illustrating a lighting device according to at least one embodiment of the present disclosure.

[0014] FIG. 6 is a drawing showing another side of a lighting device according to at least one embodiment of the present disclosure.

[0015] FIG. 7 is a drawing showing a state in which a part of a lighting device according to at least one embodiment of the present disclosure has been removed.

[0016] FIG. 8 is a drawing showing a state in which a part of a lighting device according to at least one embodiment of the present disclosure has been removed from another side.

[0017] FIG. 9 is a cross-sectional view taken along A-A' of the lighting device of FIG. 7 according to at least one embodiment of the present disclosure.

[0018] FIG. 10 is a cross-sectional view taken along B-B' of a lighting device according to at least one embodiment of the present disclosure.

[0019] FIG. 11 is a drawing illustrating the horizontal light irradiation state of a lighting device according to at least one embodiment of the present disclosure.

[0020] FIG. 12 is a drawing illustrating the vertical light irradiation state of a lighting device according to at least one embodiment of the present disclosure.

[0021] FIG. 13 is a cross-sectional view schematically illustrating the arrangement of a lighting device according to at least one embodiment of the present disclosure.

[0022] FIG. 14 is an enlarged view of a lighting device according to at least one embodiment of the present disclosure.

[0023] FIG. 15 is a graph showing the horizontal light distribution of a lighting device according to at least one embodiment of the present disclosure.

[0024] FIG. 16 is a graph illustrating the vertical light distribution of a lighting device according to at least one embodiment of the present disclosure.

[0025] The embodiments described in this specification may be modified in various ways. Specific embodiments may be depicted in the drawings and described in detail in the detailed description. However, specific embodiments disclosed in the accompanying drawings are intended only to facilitate understanding of various embodiments. Accordingly, the technical concept is not limited by specific embodiments disclosed in the accompanying drawings, and it should be understood that it includes all equivalents or substitutions that fall within the spirit and scope of the invention.

[0026] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but these components are not limited by the aforementioned terms. The aforementioned terms are used solely for the purpose of distinguishing one component from another. In this specification, terms such as “comprising” or “having” are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0027] When it is stated that one component is "connected" or "joined" to another component, it should be understood that while it may be directly connected or joined to that other component, there may also be other components in between.

[0028] On the other hand, when it is stated that one component is "directly connected" or "directly coupled" to another component, it should be understood that there are no other components in between.

[0029] In this disclosure, the term "identical" implies not only complete agreement but also a degree of difference that accounts for a range of processing errors. Furthermore, in describing this disclosure, if it is determined that a detailed description of related known functions or configurations could unnecessarily obscure the essence of this disclosure, such detailed description is abbreviated or omitted.

[0030] FIG. 1 is a drawing illustrating a vacuum cleaner (10) according to at least one embodiment of the present disclosure. Referring to FIG. 1, the vacuum cleaner (10) may include a vacuum cleaner head (100) and a lighting device (200). The vacuum cleaner head (100) is a part of the entire vacuum cleaner (10) that directly performs cleaning on the floor surface.

[0031] Depending on the type of vacuum cleaner (10), the vacuum cleaner head (100) can be implemented in various forms. For example, when implemented as a vacuum cleaner, a suction duct for sucking up foreign matter may be formed in the vacuum cleaner head (100). Alternatively, a brush may be provided along with the suction duct.

[0032] As another example, when implemented as a wet mop cleaner, the cleaner head (100) may be provided with a pad to which a mop can be attached. Alternatively, a pad to which a cleaning material such as non-woven fabric can be attached may be provided.

[0033] The main body of the vacuum cleaner (10) can also be implemented in various forms depending on the type of vacuum cleaner. For example, when implemented as a cordless vacuum cleaner, various components such as a battery, dust bin, and suction motor may be added to the vacuum cleaner (10).

[0034] The vacuum cleaner head (100) may be implemented as an integral part of the vacuum cleaner (10), or it may be implemented in a form that is detachable from the vacuum cleaner (10).

[0035] The lighting device (200) is a device for illuminating light in the direction of the floor surface to be cleaned by the vacuum cleaner (10). The lighting device (200) may be placed on one side of the vacuum cleaner head (100). FIG. 1 shows the state in which the lighting device (200) is placed at the left end when looking at the vacuum cleaner head (100) from the front.

[0036] The lighting device (200) may be positioned to have a light center axis aligned at an angle of approximately 70 to 110 degrees relative to the front of the vacuum cleaner head (100). In this disclosure, the light center axis may be a virtual axis corresponding to the center of the entire range of light irradiated by the lighting device (200). For example, the light center axis may be set relative to the front (110E) of the head part.

[0037] The lighting device (200) can irradiate light within a lighting range that covers from the front area of ​​the center of the vacuum cleaner head (100) to the front area of ​​the side of the vacuum cleaner head (100).

[0038] For example, the lighting device (200) can project light with respect to the light center axis, with a horizontal half-width of about 110 to 135 degrees. The half-width can be the width between points where the intensity of the light irradiated by the lighting device (200) is halved.

[0039] The lighting device (200) may include a light-emitting element for irradiating light and a lens for shaping the light emitted from the light-emitting element. Various embodiments of the present disclosure are illustrated and described based on the case where at least one LED is used as the light-emitting element, but the light-emitting element may be implemented in various types.

[0040] FIG. 2 is an enlarged view of section X of FIG. 1. Referring to FIG. 2, the vacuum cleaner head (100) may include a head part (101) and a brush (110).

[0041] The head part (101) may be the body of a vacuum cleaner head (110) including a brush (110) or a suction duct. The head part (101) is connected to both ends of the brush (110) when viewed from the Y direction of FIG. 2. That is, both ends of the brush (110) are connected to both ends of the head part (101).

[0042] The head part (101) supports the brush (110) so that it can rotate about a longitudinal axis of rotation. The brush (110) can rotate about a Y-axis of rotation in FIG. 2. Within the head part (101), a hole (H) may be formed at a location adjacent to the bottom surface of the head part (101) at a portion connected to one of the two ends of the brush (110) (i.e., portion X in FIG. 1). The hole (H) is configured to emit light projected from the lighting device (200) to the outside.

[0043] The lighting device (200) is mounted inside the hole (H) and can emit light outside the hole. The hole (H) of the head part (101) will be described in detail later.

[0044] FIG. 3 is a drawing showing the exterior view of the vacuum cleaner (10) of FIG. 2 as viewed from the Y direction. According to FIG. 3, a brush (110) is attached to the inner side of the head part (101), and the outer side has a closed surface. A hole (H) is formed at the bottom of the front end of the side of the head part (101), and a lighting device (200) is placed inside the hole. An opening (102) is formed at the front and bottom ends of the head part (101), through which a part of the brush (110) is exposed. Through the opening (102), the brush (110) can come into contact with the bottom surface.

[0045] FIG. 4 is a drawing showing an example of the internal configuration of a vacuum cleaner head (100) with the side of the head part removed from the drawing of FIG. 3.

[0046] Referring to FIGS. 3 and 4, a board (120) may be placed inside the head part (101). A lighting device (200) may be placed on the board (120) inside the hole (H) to project light outward through the hole (H).

[0047] The board (120) is positioned in an elongated shape in the vertical direction at the rear of the hole (H). Wiring or pads that can be electrically connected to other components may be provided at the location within the board (120) where the lighting device (200) is mounted. Through the board (120), the lighting device (200) can be electrically connected to the processor (not shown) or battery of the vacuum cleaner (10). Accordingly, the lighting device (200) can project light under the control of the processor while cleaning is being performed, based on the current supplied from the battery.

[0048] The lighting device (200) may include an LED electrically coupled to a board (120), a lens (210) positioned above the LED, and a lens cover (220) connected to the board (120) and supporting the lens (210).

[0049] In FIGS. 1 and 2, the vacuum cleaner head (100) is depicted as including a brush (110), but according to another embodiment of the present disclosure, the brush (110) does not necessarily have to be provided in the head part (101). In this case, instead of an opening (102) for receiving the brush (110), a suction opening capable of sucking up foreign matter may be formed on the lower surface of the vacuum cleaner head (100). The suction opening may be in a shape that extends horizontally with respect to the front of the vacuum cleaner head (100). Even when the suction opening is formed, a hole (H) at a position as shown in FIG. 2 may be formed in the head part (101), and a lighting device (200) may be mounted inside it, so a specific illustration thereof is omitted.

[0050] The head part (101) may be provided with at least one wheel (104) on its bottom surface. The head part (101) can be moved in position and its movement path changed through this wheel (104).

[0051] FIG. 5 is a drawing illustrating a lighting device (200) according to at least one embodiment of the present disclosure. FIG. 6 is a drawing illustrating another side view of a lighting device (200) according to at least one embodiment of the present disclosure.

[0052] Referring to FIGS. 5 and 6, the lighting device (200) includes a lens (210), an LED (230), and a lens cover (220). The lens cover (220) is provided with an opening in which the lens (210) can be fitted, and the lens (210) can be physically coupled to the lens cover (220) through the opening.

[0053] The lens cover (220) may be shaped to surround the lens (210). The front surface of the lens (210) may be formed to be rounded with a certain curve.

[0054] The lens cover (220) may be formed such that at least a portion is rounded, with the front surface corresponding to the lens (210). As shown in FIG. 5, the front surface of the lens cover (220) may be implemented so as not to protrude outward beyond the front surface of the lens (210). If the front surface of the lens cover (220) is implemented to protrude beyond the front surface of the lens (210), the height of the protruding portion may be at most about 0.5 mm or less.

[0055] Referring to FIG. 6, the lens cover (220) may have a frame-shaped structure with an opening formed in the center. A lens (210) may be received in the opening of the lens cover (220).

[0056] An internal space (211h) for accommodating an LED (230) may be formed in the lens (210). The internal space (211h) may be an empty space where the lens can be positioned. Additionally, a plurality of support members (212-1 to 212-4) protruding from the rear surface may be formed around the internal space (211h) on the rear surface of the lens (210). Referring to FIG. 6, each of the plurality of support members (212-1 to 212-4) is depicted in the form of a cylinder, but the size, number, and shape of the support members may be varied.

[0057] An LED (230) may be provided in the area between the multiple support members (212-1 to 212-4).

[0058] FIG. 7 is a diagram illustrating the configuration of a lens used in the lighting device of FIG. 5 and FIG. 6. FIG. 8 is a diagram illustrating the rear view of the lens of FIG. 7.

[0059] Referring to FIG. 7, the lens (210) may have a convex light-emitting surface (212) corresponding to the front surface. Each side of the lens (210) extending from the front surface, namely, one side surface (213-3), the other side surface (213-4), the upper side surface (213-2), and the lower side surface (213-1), may be tapered at a predetermined inclination. The inclination of each side surface may be the same, but is not necessarily limited thereto, and may be manufactured to have different inclinations considering the lighting range.

[0060] Referring to FIG. 8, an internal space (211h) is formed on the rear side of the lens (210). On the rear side of the lens (210), a plurality of support members (212-1 to 212-4) may be provided on both sides with the internal space (211) in between. The plurality of support members (212-1 to 212-4) may each be provided in the form of, for example, circular panels, with a pair facing each other on the left and right sides. Here, although the plurality of support members (212-1 to 212-4) are each depicted with a circular cross-section, it is understood that they are not limited to a circular cross-section and may be provided with a cross-section such as an ellipse or a polygon.

[0061] The lens (210) may be provided with protrusions (214-1, 214-2) positioned between a plurality of support members (212-1 to 212-4). Specifically, a first protrusion (214-1) protruding toward one side (213-3) of the lens (210) and a second protrusion (214-2) protruding toward the other side (213-4) of the lens (210) may be formed.

[0062] However, it is not limited to this, and protrusions may also be formed on the upper side (213-2) and lower side (213-1) of the aforementioned lens (210).

[0063] The protrusion can be coupled to at least one groove formed in the lens cover (220). Depending on the coupling of the protrusion and the groove, the lens (210) and the lens cover (220) can be stably assembled.

[0064] According to FIG. 8, the protrusions (214-1, 214-2) may be provided in the form of rectangular bar-shaped panels facing the inner wall of the lens cover (220). The protrusions (214-1, 214-2) may basically be provided as a continuous integral form along the longitudinal direction, but they may also be provided as a segmented form in which at least a portion along the longitudinal direction is segmented into multiple parts.

[0065] FIGS. 9 and FIGS. 10 are drawings showing an example of the internal structure of a lighting device according to at least one embodiment of the present disclosure.

[0066] Specifically, FIG. 9 is a cross-sectional view of the lighting device (200) according to FIG. 7 taken along A-A'. Referring to FIG. 9, the lens (210) may be provided such that the light-emitting surface (212) has a cross-section (212-1) that is convex in the first direction.

[0067] The surface corresponding to the internal space (211h) of the lens (210) faces the LED (230), so it functions as the light-input surface (211) into which light is incident from the LED (230). As shown in FIG. 9, the lens (210) has a light-input surface (211) that is concave in the first direction.

[0068] The lens (210) and lens cover (220) may be provided to be positioned directly on the board (120).

[0069] The lens (210) can be mounted on the board (120) through the aforementioned plurality of support members (212-1 to 212-4). The LED (230) can be provided to be received in the internal space (211h) of the lens (210) inside the lens cover (220). The LED (230) can irradiate light onto the light-receiving surface (211) of the internal area (211h) of the lens (210). The LED (230) can be mounted on the board (120) by being located within an area (e.g., a center area, etc.) where the plurality of support members (212-1 to 212-4) face each other.

[0070] However, it is not necessarily limited to this, and the lighting device (100) may further include a separate substrate. In this case, the substrate may be equipped with an LED (230), a lens (210), a lens cover (220), etc. Wiring for applying an electrical signal to the LED (230) may be formed on the substrate, and the lighting device (100) may be mounted on the board (120) as a whole substrate.

[0071] The lens cover (220) may include at least one groove (220-1, 220-2) formed on the inner wall of the lens (210). When two protrusions (214-1, 214-2) are formed as described in FIG. 8, the groove may also be composed of a first groove (220-1) and a second groove (220-2) to correspond thereto. The first protrusion (214-1) and the second protrusion (214-2) of the lens (210) may be fastened by a hook method, such as being fitted into the first and second grooves (220-1, 220-2), respectively. Here, the first protrusion (214-1) and the second protrusion (214-2) may be provided with a triangular cross-sectional shape. The shape of the first and second grooves (220-1, 220-2) can be formed to correspond to the shape of the first protrusion (214-1) and the second protrusion (214-2).

[0072] Since the physical bonding structure between the lens (210) and the lens cover (220) according to the present disclosure does not require the use of a separate chemical bonding method (e.g., adhesive method), it is possible to prevent light interference during the light irradiation process caused by adhesive components and stains. Therefore, the light irradiation efficiency on the lens (210) can be increased relatively compared to a chemical bonding method.

[0073] FIG. 10 is a cross-sectional view of the lighting device (200) of FIG. 7 taken along B-B'. Referring to FIG. 10, the lens (210) may be formed such that the light-emitting surface (212) has a cross-section that is horizontal in a second direction perpendicular to the first direction described above. Additionally, the lens (210) may be formed such that the light-incoming surface (211) is convex in the second direction.

[0074] FIG. 11 is a drawing illustrating the light distribution in the horizontal direction of a lighting device (200) according to at least one embodiment of the present disclosure. FIG. 12 is a drawing illustrating the light distribution in the vertical direction of a lighting device (200) according to at least one embodiment of the present disclosure.

[0075] The lighting device (200) can be configured so that light is diffused in the horizontal direction as shown in FIG. 11 and concentrated in the vertical direction as shown in FIG. 12 through the structure of the aforementioned lens (210) as well as the mutual coupling relationship of the lens cover (220) and the head part (101).

[0076] According to FIG. 11, light emitted from the LED (230) strikes the light entry surface (211) of the lens (210), is slightly refracted, passes through the lens (210), and is emitted from the light exit surface (212), and is partially diffused in the lateral direction. Accordingly, the horizontal half-width can be within 110 to 135 degrees.

[0077] According to FIG. 12, as the side lights strike the convex light entry surface (211) in the vertical direction, they are greatly refracted to the left and right, and then strike the side of the lens (210) and are focused back toward the center of the lens (210). Accordingly, the light emitted from the light exit surface (212) can be focused rather than widely diffused.

[0078] By using a lighting device (200) having such light distribution characteristics, the vacuum cleaner (10) can illuminate not only the front of the vacuum cleaner head (200) but also the side front portion, even if the lighting device (200) is placed only on one side of the vacuum cleaner head (200). In addition, since the light is projected while the lighting device (200) is placed in a position almost adjacent to the floor surface where the brush contacts, that is, the cleaning surface, dust and other debris on the floor surface can be identified better than when shining from an upward direction downward.

[0079] In the case of a vacuum cleaner (10) without a brush (110), a lighting device (200) can be arranged in a similar or identical shape based on the suction opening to enable improved identification.

[0080] FIG. 13 is a cross-sectional view schematically illustrating the arrangement of a lighting device (200) in a vacuum cleaner according to at least one embodiment of the present disclosure. Referring to FIG. 13, as described above, the lighting device (200) is arranged in a tilted shape toward the center of the vacuum cleaner head (200) with respect to the front of the vacuum cleaner head (200). Specifically, the light center axis of the lens (210) can be arranged at an appropriate angle within the vacuum cleaner head (200) so that it can be aligned at an angle ranging from 70 to 110 degrees with respect to the front of the vacuum cleaner head (100).

[0081] Based on FIG. 13, the lighting device (200) may be positioned at the right end of the head part (101) and may be provided facing left relative to the front of the vacuum cleaner head (100). Of course, it is not limited to this and may be positioned on the opposite side.

[0082] FIG. 14 is an enlarged view of a lighting device (200) according to at least one embodiment of the present disclosure. Referring to FIG. 14, the head part (101) may further include at least one partition (130) disposed in the edge area of ​​the hole (H). The partition (130) is configured to limit the light projection area of ​​the lighting device (200) to a preset range.

[0083] More specifically, a recessed area (140) that is recessed in the rearward direction may be formed on the front of the head part (101). A lighting device (200) may be provided to be located within this recessed area (140). The recessed area (140) may be the hole (H) described above.

[0084] The recessed area (140) can be divided into a first area (141) that is recessed diagonally on one side relative to the lighting device (200) and a second area (142) that is recessed on the other side.

[0085] The partition wall (130) may be formed in the first area (141) located on the outer side. On the other hand, the second area (142), unlike the first area (141), may not have a separate partition wall and may be formed to be open to the other side of the lighting device (200). Accordingly, light emitted from the lighting device (200) is restricted as it strikes the partition wall (130) while spreading in a lateral direction relative to the front of the vacuum cleaner head (200). Depending on the size, shape, and distance from the hole (H) of the partition wall (130), the lighting range may be varied.

[0086] The partition wall (130), the first region (141), and the second region (142) may correspond to at least part of the structure for light forming that enables the light center axis of the aforementioned lighting device (200) to be realized.

[0087] The lighting device (200) may be positioned such that its front portion is located relatively rearward relative to the front portion of the head part (101), thereby being positioned further inward within the recessed area (140). In this case, a third area (143) corresponding to the upper portion of the lighting device (200) may be exposed within the recessed area (140), and a fourth area (144) corresponding to the lower portion of the lighting device (200) may be exposed. At least one of the first to fourth areas (141 to 144) may be tapered, but is not necessarily limited thereto.

[0088] FIG. 15 is a graph showing the horizontal light distribution of a lighting device (200) according to at least one embodiment of the present disclosure. FIG. 16 is a graph showing the vertical light distribution of a lighting device (200) according to at least one embodiment of the present disclosure.

[0089] Referring to FIG. 15, it can be seen that compared to the light distribution graph (1401) when there is no partition (130), the light distribution graph (1402) when there is a partition is concentrated at the end part (Z region) of the entire light distribution area. That is, compared to the distribution (1401) when there is no partition (130), it can be seen that the boundary of the light irradiation area has become clearer.

[0090] On the other hand, referring to FIG. 16, it can be seen that the light does not spread widely in the vertical direction but is focused on the central axis. In the case of the vacuum cleaner (10), since it is easy to detect foreign substances when light is irradiated near the bottom surface, the light can be focused in the vertical direction as in FIG. 16 so that the bottom surface can be seen more clearly.

[0091] Although the above various embodiments have been illustrated and described based on a vacuum cleaner (10) equipped with a vacuum cleaner head, the embodiments of the present disclosure may also be applied to robot vacuum cleaners that do not have a vacuum cleaner head. Alternatively, they may be applied to mobile robot devices that do not have a vacuum cleaner function (e.g., mobile projectors, serving robots, etc.). In the case of a robot vacuum cleaner that does not have a vacuum cleaner head, the lighting device (200) may be positioned at the lower front of the main body of the robot vacuum cleaner. In this case, the light center axis of the lighting device (200) may be aligned with the center axis of the front of the main body.

[0092] Although various embodiments of the present disclosure have been described individually above, each embodiment is not required to be implemented alone, and the configuration and operation of each embodiment may be implemented in combination with at least one other embodiment.

[0093] In addition, although preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications can be made by those skilled in the art without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical spirit or perspective of the present disclosure.

Claims

1. Vacuum cleaner head; and A lighting device having a light center axis disposed on one side of the vacuum cleaner head and aligned at an angle ranging from 70 to 110 degrees relative to the front of the vacuum cleaner head; comprising The above lighting device is, LED; and A lens having an internal space formed to accommodate the above LED; comprising, A vacuum cleaner having a light-emitting surface of the lens that is convex in a first direction and has a cross-section that is horizontal in a second direction perpendicular to the first direction.

2. In Paragraph 1, The above lighting device is a vacuum cleaner that projects light with a horizontal half-width of 110 to 135 degrees based on the light center axis.

3. In Paragraph 2, A vacuum cleaner in which the light-receiving surface facing the LED within the internal space of the lens is concave in the first direction and convex in the second direction.

4. In Paragraph 2, The above vacuum cleaner head is, Brush; and A head part connected to both ends of the brush and supporting the brush so that it can rotate about a longitudinal axis of rotation; comprising The head part above is, A hole formed at a position adjacent to the bottom surface of the head part in a portion connected to one of the two ends of the brush within the head part; A vacuum cleaner in which the lighting device is placed on a board within the hole and projects light outward through the hole.

5. In Paragraph 4, The above vacuum cleaner head is, A head part having a suction opening formed horizontally relative to the front of the vacuum cleaner head; comprising The above head part is In the head part, a hole is formed at a position adjacent to the bottom surface of the head part in a portion connected to one end of the suction opening, and A vacuum cleaner in which the lighting device is placed on a board within the hole and projects light outward through the hole.

6. In Paragraph 4, The above lighting device is, It further includes a lens cover connected to the board and supporting the lens, The above lens includes at least one protrusion protruding in a lateral direction, and A vacuum cleaner, wherein the lens cover comprises at least one groove capable of being coupled with the at least one protrusion.

7. In Paragraph 4, The head part above is, It further includes at least one partition wall disposed in the edge region of the above hole, and The above at least one bulkhead is, A vacuum cleaner tilted to limit the projection area of ​​the light projected from the lighting device to a preset range.

8. In lighting devices, LED; and A lens having an internal space formed to accommodate the above LED; comprising, The light-emitting surface of the lens is convex in a first direction and has a horizontal cross-section in a second direction perpendicular to the first direction. A lighting device in which the light-receiving surface facing the LED within the internal space of the lens is concave in the first direction and convex in the second direction.

9. In Paragraph 8, The above lens is, A lighting device that shapes light emitted from the above LED into light with a horizontal half-width within a range of 110 to 135 degrees with respect to the light center axis.

10. In Paragraph 9, It further includes a lens cover connected to a board on which the above LED is mounted and supporting the above lens, and The above lens includes at least one protrusion protruding in a lateral direction, and A lighting device comprising at least one groove that can be coupled with the at least one protrusion, wherein the lens cover described above comprises at least one groove.

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