Projection lamp

Abstract

The utility model provides a projection lamp which comprises a projection disc which is rotatably arranged, a plurality of pattern areas are sequentially arranged on the projection disc in the circumferential direction, at least two pattern areas are different in area and / or shape, projection patterns are arranged in each pattern area, and each pattern area is correspondingly provided with a detection structure; the multiple detection structures sequentially pass through the detection sensor in the rotation process of the projection disc, and under the condition that the detection structures are opposite to the detection sensor, the detection sensor detects the positions of the corresponding pattern areas; the driving part is used for driving the projection disc to rotate, the driving part is electrically connected with the detection sensor, and when the driving part receives the stop signal and the detection sensor detects the position of the corresponding pattern area, the projection disc is controlled to stop rotating. According to the scheme, when the projection pattern is switched, the projection pattern can be accurately rotated to a required position; and the projection pattern can be set into different areas and / or shapes according to different pattern regions, so that the projection effect can be enriched.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting equipment, in particular to a projection lamp. Background Art

[0002] The projection lamp's projection disc is equipped with multiple projection patterns. A laser generator illuminates the projection patterns, creating corresponding patterns on the laser receiving surface. To create different patterns, the projection disc rotates, stopping when the desired projection pattern matches the laser generator. This requires precise positioning of the disc.

[0003] Existing projection lamps often use a stepper motor to control the rotational position of the projection disc to achieve a fixed projection pattern. This solution is relatively complex and inevitably results in precision deviations when installing the projection disc. This can lead to deviations in the rotational position of the projection disc during actual use, making it difficult for the projection pattern to remain accurately in the desired position. Furthermore, existing projection lamps offer a relatively limited projection effect. Utility Model Content

[0004] The utility model provides a projection lamp to solve the problems in the prior art that the projection pattern in the projection lamp is difficult to rotate to an accurate position and the projection effect is single.

[0005] In order to solve the above problems, the utility model provides a projection lamp, comprising: a projection disk, which is rotatably arranged, and the projection disk is sequentially provided with a plurality of pattern areas along the circumferential direction, at least two pattern areas have different areas and / or shapes, each pattern area is provided with a projection pattern, and each pattern area is correspondingly provided with a detection structure; a detection sensor, during the rotation of the projection disk, the plurality of detection structures pass through the detection sensor in sequence, when the detection structure is opposite to the detection sensor, the detection sensor detects the position of the corresponding pattern area; a driving part, used to drive the projection disk to rotate, the driving part and the detection sensor are electrically connected, and the driving part is also used to stop driving the projection disk to rotate when a stop signal is received and the detection sensor detects the position of the corresponding pattern area.

[0006] Furthermore, the projection lamp also includes a laser generator, which is used to illuminate the projection pattern in the pattern area; when the projection disc stops rotating, the detection sensor and the laser generator correspond to the same pattern area.

[0007] Furthermore, the pattern area is fan-shaped, and the detection structure is located on the center line of the pattern area. When the projection disk stops rotating, on the top projection surface of the projection disk, the detection position of the detection sensor and the laser emission position of the laser generator are both located on the center line of the pattern area.

[0008] Furthermore, the projection disk includes an annular wheel and a circular diffraction optical plate, the diffraction optical plate is fixed to the annular wheel, the diffraction optical plate includes multiple pattern areas, and multiple detection structures are distributed on the annular wheel or the diffraction optical plate. The driving part drives the annular wheel to rotate.

[0009] Furthermore, the annular wheel includes an annular carrier plate and multiple positioning structures distributed around the annular carrier plate. The periphery of the diffraction optical plate is mounted on the annular carrier plate. The circumference of the diffraction optical plate has multiple positioning grooves, and the multiple positioning grooves and the multiple positioning structures are matched one-to-one.

[0010] Furthermore, the positioning structure includes two positioning ribs, which are respectively engaged with two opposite side walls of the positioning groove, and a detection structure is provided between the two positioning ribs of each positioning structure.

[0011] Furthermore, the annular wheel further includes an outer gear ring, which is arranged around the outer circumferential surface of the annular bearing plate, and the driving part is engaged with the outer gear ring.

[0012] Furthermore, the detection sensor is an infrared pair tube, which includes a transmitting tube and a receiving tube arranged opposite to each other, and the transmitting tube and the receiving tube are respectively located on opposite sides of the projection disk; the detection structure is a through hole arranged on the projection disk, and there is a solid structure between two adjacent through holes in the circumferential direction of the projection disk. When the through hole and the receiving tube correspond to each other, the receiving tube receives the infrared ray emitted by the transmitting tube, thereby detecting the position of the pattern area corresponding to the through hole; or, the detection structure is a solid block arranged on the projection disk, and there is a cavity between two adjacent solid blocks in the circumferential direction of the projection disk. When the solid block and the receiving tube correspond to each other, the receiving tube cannot receive the infrared ray emitted by the transmitting tube, thereby detecting the position of the pattern area corresponding to the solid block.

[0013] Alternatively, the detection sensor is a Hall switch and the detection structure is a magnet.

[0014] Furthermore, the driving part includes a motor and a transmission assembly, and the motor drives the projection disk to rotate through the transmission assembly.

[0015] Furthermore, the transmission assembly includes a first gear, a second gear, a third gear and a fourth gear, the first gear is mounted on the output shaft of the motor, the second gear is meshed with the first gear, the third gear and the second gear are mounted on the same rotating shaft, the diameter of the third gear is smaller than that of the second gear, the third gear is meshed with the fourth gear, and the fourth gear is meshed with the external teeth on the projection disk.

[0016] Furthermore, the projection lamp also includes: a control board, the detection sensor and the driving unit are electrically connected to the control board, the control board is used to receive the detection results of the detection sensor and control the driving unit to stop running; a bracket, the projection disc, the detection sensor and the driving unit are all installed on the bracket.

[0017] In this solution, a detection structure is provided for each pattern area on the projection disk. A drive unit drives the projection disk to rotate. When the detection structure rotates to a position relative to a detection sensor, the detection sensor detects the position of the detection structure, thereby determining the pattern area corresponding to the detection structure and the position of the projection pattern on the pattern area. During the rotation of the projection disk, when the drive unit receives a stop signal and the detection sensor detects the position of the corresponding pattern area, the position of the projection pattern is the desired position for the projection pattern to remain. At this time, the drive unit stops and the projection disk stops rotating, thereby accurately rotating the projection pattern to the desired position, forming a static projection pattern displayed on the projection surface.

[0018] Furthermore, in this embodiment, at least two pattern areas on the projection disk have different areas or shapes, or both. This allows the projection patterns within the pattern areas to be configured to have different areas and / or shapes depending on the pattern areas. This allows users to select projection patterns of different areas and / or shapes for projection during use, enriching the projection effects, avoiding the problem of a single projection pattern, and expanding the applicability of the projection lamp. When the projection disk continuously rotates at a constant speed, different projection patterns are sequentially presented on the projection surface. Different pattern areas can remain on the projection surface for different periods of time, further enriching the projection effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 The figure shows a schematic structural diagram of a projection lamp provided in the first embodiment of the present utility model;

[0021] Figure 2 Shown Figure 1 A top view of a portion of the structure;

[0022] Figure 3 Shown Figure 1 Schematic diagram of the projection disk in;

[0023] Figure 4 Shown Figure 3 Schematic diagram of the ring wheel in;

[0024] Figure 5 Shown Figure 1 Schematic diagram of the detection sensor in;

[0025] Figure 6 The figure shows a schematic structural diagram of a projection lamp provided in the second embodiment of the present utility model;

[0026] Figure 7 Shown Figure 6 Schematic diagram of the projection disk in;

[0027] Figure 8 Shown Figure 6 Schematic diagram of the detection sensor in .

[0028] The above drawings include the following reference numerals:

[0029] 10. Projection disk;

[0030] 11. Pattern area; 12. Detection structure; 121. Through hole; 122. Magnet; 13. Ring wheel; 131. Ring carrier plate; 132. Positioning structure; 133. Outer gear ring; 14. Diffraction optical plate;

[0031] 20. Detection sensor;

[0032] 21. Transmitter tube; 22. Receiver tube; 23. Hall switch;

[0033] 30. Driving unit;

[0034] 31. Motor; 32. First gear; 33. Second gear; 34. Third gear; 35. Fourth gear;

[0035] 40. Laser generator;

[0036] 50. Bracket. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way serves as any limitation on the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] like Figure 1As shown, the first embodiment of the present invention provides a projection lamp, including a projection disk 10, a detection sensor 20, and a drive unit 30; wherein the projection disk 10 is rotatably arranged, and the projection disk 10 is sequentially provided with a plurality of pattern areas 11 along the circumference, at least two of the pattern areas 11 having different areas and / or shapes, each pattern area 11 being provided with a projection pattern, and each pattern area 11 being provided with a corresponding detection structure 12; during the rotation of the projection disk 10, the plurality of detection structures 12 sequentially pass through the detection sensor 20, and when the detection structure 12 is opposite to the detection sensor 20, the detection sensor 20 detects the position of the corresponding pattern area 11; the drive unit 30 is used to drive the projection disk 10 to rotate, and the drive unit 30 is electrically connected to the detection sensor 20. The drive unit 30 is also used to stop driving the projection disk 10 to rotate when a stop signal is received and the detection sensor 20 detects the position of the corresponding pattern area 11. wherein, each pattern area 11 being provided with a corresponding detection structure 12 means that the detection structure 12 can be located within the pattern area 11 or outside the pattern area 11.

[0039] In this embodiment, a detection structure 12 is provided corresponding to each pattern area 11 of the projection disk 10. The driving unit 30 is configured to drive the projection disk 10 to rotate upon receiving a start signal. When the detection structure 12 rotates to a position relative to the detection sensor 20, the detection sensor 20 detects the position of the detection structure 12, thereby determining the position of the pattern area 11 corresponding to the detection structure 12 and the position of the projection pattern on the pattern area 11. During the rotation of the projection disk, when the driving unit 30 receives a stop signal and the detection sensor 20 detects the position of the corresponding pattern area 11, the position of the projection pattern is the desired position for the projection pattern to remain. At this time, the driving unit 30 stops operating, and the projection disk 10 also stops rotating, thereby accurately rotating the projection pattern to the desired position, forming a static projection pattern displayed on the projection surface.

[0040] When the statically displayed projection pattern needs to be switched again, the driving unit 30 drives the projection disc 10 to rotate again, and the detection sensor 20 detects the next detection structure 12. At this time, the projection disc 10 is controlled to stop rotating, thereby switching the next projection pattern to the required position.

[0041] During the process of the driving unit 30 driving the projection disk 10 to rotate, if the projection disk 10 does not need to stop, when the detection sensor 20 detects the position of the corresponding pattern area 11, the projection disk 10 continues to rotate. In this case, the projection effects of different projection patterns can be presented in sequence on the projection surface; when the projection pattern needs to be projected statically, when the detection sensor 20 detects the position of the pattern area 11 where the nearest projection pattern is located, the driving unit 30 stops running and the projection disk 10 stops rotating.

[0042] In one exemplary embodiment, when the projection lamp is in use, the driver 30 first drives the projection disk 10 to rotate continuously. Different projection patterns on the projection disk 10 are sequentially illuminated, and the projection effects of the different projection patterns are sequentially presented on the corresponding projection surface of the projection lamp. When the projection disk 10 does not need to stop, the detection sensor 20 detects the position of the corresponding pattern area 11, and the projection disk 10 continues to rotate. When it is necessary to project the projection pattern statically, a button on the projection lamp or an app that controls the projection lamp sends an electrical signal (a first signal) to stop rotation. The electrical signal is transmitted to the detection sensor 20 or the control board in the projection lamp. Because the detection sensor 20 does not detect the position of the corresponding pattern area 11, the projection disk 10 continues to rotate. When the detection sensor 20 detects the nearest detection structure 12, that is, when it detects the projection pattern corresponding to the detection structure 12, the detection sensor 20 or the control board generates a stop signal (a second signal, different from the first signal). The driver 30 receives the stop signal and controls the driver 30 to stop, thereby stopping the projection disk 10 and projecting a static pattern on the projection surface.

[0043] Furthermore, in this embodiment, at least two pattern areas 11 on the projection disk 10 have different areas or shapes, or both areas and shapes. For example, the pattern areas 11 can be configured in a sector, circle, rectangle, or other shape. Thus, the projection pattern within the pattern areas 11 can be configured to have different areas and / or shapes depending on the different pattern areas 11. This allows users to select projection patterns of different areas and / or shapes for projection during use, enriching the projection effect, avoiding the problem of a single projection pattern, and increasing the applicability of the projection lamp. When the projection disk 10 rotates continuously at a certain speed, different projection patterns are sequentially presented on the projection surface. Different pattern areas 11 can remain on the projection surface for different periods of time. For example, the projection of a larger pattern area 11 can remain on the projection surface longer than a smaller pattern area 11, further enriching the projection effect.

[0044] like Figure 2 As shown, the projection lamp also includes a laser generator 40, which is used to illuminate the projection pattern within the pattern area 11. When the projection disc 10 is stopped, the detection sensor 20 and the laser generator 40 correspond to the same pattern area 11. Different pattern areas 11 occupy different circumferential areas of the projection disc 10. Switching between pattern areas 11 corresponding to the laser generator 40 requires different rotation angles of the projection disc 10. This arrangement prevents the projection pattern in the pattern area 11 from misaligning with the laser generator 40 after switching between different pattern areas 11, thereby affecting the projection effect.

[0045] In an illustrative embodiment, the pattern area 11 is fan-shaped, and the areas of at least two pattern areas 11 are not equal, and the central angles of the pattern areas 11 are not equal. For two adjacent pattern areas 11 with unequal central angles, if it is necessary to switch the pattern area 11 corresponding to the laser generator 40, the angles required to be rotated are unequal. When the projection disc 10 stops rotating, if the detection sensor 20 and the laser generator 40 correspond to different pattern areas 11, when the projection disc 10 rotates the angle of one pattern area 11 again, the laser generator 40 will not be able to accurately correspond to the projection pattern in the next pattern area 11, and the position will deviate. Therefore, through the above-mentioned setting, when the projection disc 10 rotates, when the detection sensor 20 detects different detection structures 12, the projection patterns on the corresponding pattern areas 11 can all correspond to the laser generator 40.

[0046] Furthermore, the detection structure 12 is located on the centerline of the sector-shaped pattern area 11. When the projection disc 10 stops rotating, the detection position of the detection sensor 20 and the laser emission position of the laser generator 40 are both located on the centerline of the pattern area 11 on the top projection surface of the projection disc 10. The centerline of the pattern area 11 is also the centerline of the sector. The centerline of the sector refers to the angle bisector of the circular angle of the sector, and can also be understood as the line connecting the midpoint of the arc of the sector and the center of the circle in which the sector is located.

[0047] Since the detection sensor 20 controls the projection disk 10 to stop rotating when it detects the detection structure 12, the above arrangement ensures that when the projection disk 10 stops rotating, the detection structure 12, the detection position of the detection sensor 20, and the laser emission position of the laser generator 40 are all located at the center line of the pattern area 11. In other words, the projected pattern on the pattern area 11 and the laser generator 40 are always accurately positioned relative to each other, ensuring accurate positioning of the projected pattern, thereby avoiding deviation and maintaining the projection effect of the pattern. Through the above arrangement, even if the area of ​​the pattern area 11 is different, it does not affect the accurate correspondence between the projected pattern and the laser generator 40 after rotation.

[0048] The laser generator 40 generates considerable heat during operation. To improve heat dissipation, multiple cooling fins are provided around the laser generator 40 to dissipate the heat and prevent damage to the device due to high temperatures. A cooling fan may also be provided within the projection lamp to dissipate heat from the laser generator 40.

[0049] like Figure 3 and Figure 4As shown, the projection disk 10 includes an annular wheel 13 and a circular diffractive optical plate 14. The diffractive optical plate 14 is mounted and fixed to the annular wheel 13. The diffractive optical plate 14 includes multiple pattern areas 11. Multiple detection structures 12 are distributed on the annular wheel 13 or the diffractive optical plate 14. The driving unit 30 drives the annular wheel 13 to rotate. The annular wheel 13 serves to mount and protect the diffractive optical plate 14 and drives the diffractive optical plate 14 during rotation. The annular wheel 13 can be a gear, a pulley, or a synchronous wheel.

[0050] Specifically, the annular wheel 13 includes an annular carrier plate 131 and multiple positioning structures 132 distributed around the circumference of the annular carrier plate 131. The periphery of the diffractive optical plate 14 is mounted on the annular carrier plate 131. The diffractive optical plate 14 has multiple positioning grooves along its circumference, and these grooves and the positioning structures 132 correspond one-to-one. The annular carrier plate 131 enables axial and circumferential positioning and mounting of the diffractive optical plate 14. Furthermore, the hollow area surrounded by the annular carrier plate 131 avoids obstruction of the projected pattern and light.

[0051] like Figure 4 As shown, the positioning structure 132 includes two positioning ribs, which are respectively engaged with the two opposite side walls of the positioning groove to limit the relative positions of the annular wheel 13 and the diffraction optical plate 14 in the circumferential direction. A detection structure 12 is arranged between the two positioning ribs of each positioning structure 132, thereby making full use of the area between the two positioning ribs.

[0052] The annular wheel 13 also includes an outer ring gear 133, which is disposed around the outer circumference of the annular carrier plate 131. The driving unit 30 meshes with the outer ring gear 133. The rotation of the outer ring gear 133 drives the diffractive optical plate 14 to rotate. Furthermore, the outer ring gear 133 surrounds the diffractive optical plate 14, providing protection for the plate.

[0053] like Figure 5 As shown, the detection sensor 20 can be an infrared pair tube, which includes a transmitting tube 21 and a receiving tube 22 arranged opposite to each other. The transmitting tube 21 and the receiving tube 22 are respectively located on two opposite sides of the projection disk 10. The transmitting tube 21 is used to transmit infrared rays, and the receiving tube 22 is used to receive the infrared rays emitted by the transmitting tube 21.

[0054] like Figure 3 and Figure 4As shown, in a specific embodiment, the detection structure 12 is a through hole 121 provided on the projection disk 10. A solid structure is provided between two adjacent through holes 121 along the circumference of the projection disk 10. When the projection disk 10 rotates, if the solid structure between two adjacent through holes 121 blocks the transmitting tube 21, the receiving tube 22 cannot receive infrared rays. However, if the through holes 121 and the receiving tube 22 correspond to each other, the receiving tube 22 receives the infrared rays emitted by the transmitting tube 21, thereby detecting the position of the pattern area 11 corresponding to the through hole 121. When the projection disk 10 does not need to stop, the projection disk 10 keeps rotating. When the projection disk 10 needs to stop, an electrical signal to stop the rotation is sent through a button on the projection lamp or an APP that controls the projection lamp. The electrical signal is transmitted to the infrared pair tube or the control board in the projection lamp, and the projection disk 10 continues to rotate. When the infrared pair tube detects the nearest through hole 121, that is, the projection pattern corresponding to the through hole 121 is detected, the infrared pair tube or the control board generates a stop signal, and the drive unit 30 receives the stop signal and controls the drive unit 30 to stop running, so that the projection disk 10 stops rotating and a static pattern is projected on the projection surface.

[0055] Alternatively, in an embodiment not shown, the detection structure 12 is a solid block disposed on the projection disk 10. A cavity is formed between adjacent solid blocks along the circumference of the projection disk 10. During the rotation of the projection disk 10, if the cavity between adjacent solid blocks avoids the transmitting tube 21, the receiving tube 22 receives infrared light. If the solid blocks correspond to the receiving tube 22, the receiving tube 22 cannot receive the infrared light emitted by the transmitting tube 21, thereby detecting the position of the pattern area 11 corresponding to the solid block. When the projection disk 10 does not need to stop, the projection disk 10 continues to rotate. If it does need to stop, an electrical signal to stop rotation is sent via a button on the projection lamp or an app that controls the projection lamp. This signal is transmitted to the infrared pair or the control board in the projection lamp, causing the projection disk 10 to continue rotating. When the infrared pair detects the nearest solid block, i.e., it has detected the projection pattern corresponding to the solid block, the infrared pair or the control board generates a stop signal. The driver 30 receives the stop signal and controls the driver 30 to stop, thereby stopping the rotation of the projection disk 10 and projecting a static pattern on the projection surface.

[0056] In this embodiment, the projection lamp further includes a control board, to which both the detection sensor 20 and the drive unit 30 are electrically connected. The control board is configured to receive detection results from the detection sensor 20 and control the drive unit 30 to stop. Specifically, when the detection sensor 20 corresponds to the detection structure 12, the detection sensor 20 detects the position of the detection structure 12 and transmits the detection result to the control board. The detection result indicates that the detection sensor 20 has detected the position of the detection structure 12, that is, the position of the pattern area 11 corresponding to the detection structure 12. If the drive unit 30 needs to stop, the control board generates a stop signal when the detection sensor 20 detects the nearest position of the detection structure 12. The drive unit 30 receives the stop signal, thereby controlling the drive unit 30 to stop, and the projection disk 10 stops rotating.

[0057] The projection lamp further includes a bracket 50 , on which the projection disc 10 , the detection sensor 20 and the driving unit 30 are all mounted.

[0058] In this embodiment, the drive unit 30 includes a motor 31 and a transmission assembly. The motor 31 drives the projection disk 10 to rotate through the transmission assembly. The transmission assembly can act as a decelerator. The transmission assembly can adopt a worm gear structure, a belt drive structure, a chain drive structure, etc.

[0059] Specifically, if Figure 1 and Figure 2 As shown, the transmission assembly includes a first gear 32, a second gear 33, a third gear 34, and a fourth gear 35. The first gear 32 is mounted on the output shaft of the motor 31, the second gear 33 meshes with the first gear 32, and the third gear 34 and the second gear 33 are mounted on the same rotating shaft. The diameter of the third gear 34 is smaller than that of the second gear 33. The third gear 34 meshes with the fourth gear 35, and the fourth gear 35 meshes with the external teeth on the projection disk 10. This multi-stage gear transmission can reduce the rotational speed, preventing the projection disk 10 from rotating at too high a speed and making it difficult to accurately control its position.

[0060] like Figures 6 to 8 As shown, the second embodiment of the present invention provides another projection lamp, which differs from the above embodiments in that the detection sensor 20 is a Hall switch 23, and the detection structure 12 is a magnet 122. When the Hall switch 23 corresponds to the magnet 122, the magnetic field changes, and the Hall switch 23 senses the position of the magnet 122, thereby determining the position of the pattern area 11 corresponding to the magnet 122. When it is necessary to stop the projection disk 10, the drive unit 30 is controlled to stop when the Hall switch 23 senses the position of the magnet 122, thereby stopping the projection disk 10. This allows the projection disk 10 to be stopped at the desired position, so that the projected pattern stops at the desired position, avoiding position deviation.

[0061] When the projection disk 10 does not need to stop, the projection disk 10 continues to rotate after the Hall switch 23 senses the position of the magnet 122; when the projection disk 10 needs to stop, an electrical signal to stop rotation is sent through the button on the projection lamp or the APP that controls the projection lamp. The electrical signal is transmitted to the Hall switch 23 or the control board in the projection lamp, and the projection disk 10 continues to rotate. When the Hall switch 23 detects the nearest magnet 122, that is, the projection pattern corresponding to the magnet 122 is detected, the Hall switch 23 or the control board generates a stop signal, and the drive unit 30 receives the stop signal and controls the drive unit 30 to stop running, so that the projection disk 10 stops rotating and a static pattern is projected on the projection surface.

[0062] The above description is merely an optional embodiment of the present invention and is not intended to limit the present invention. Persons skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0064] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of this solution. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the techniques, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary, rather than limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0065] In the description of this scheme, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this scheme and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this scheme; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0066] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0067] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this solution.

Claims

1. A projection lamp, characterized in that: include: A projection disk (10) is rotatably arranged, wherein the projection disk (10) is sequentially provided with a plurality of pattern areas (11) along a circumferential direction, at least two of the pattern areas (11) have different areas and / or shapes, each of the pattern areas (11) is provided with a projection pattern, and each of the pattern areas (11) is correspondingly provided with a detection structure (12); a detection sensor (20), wherein the plurality of detection structures (12) sequentially pass through the detection sensor (20) during the rotation of the projection disk (10), and when the detection structures (12) are opposite to the detection sensor (20), the detection sensor (20) detects the position of the corresponding pattern area (11); A driving unit (30) is used to drive the projection disc (10) to rotate. The driving unit (30) is electrically connected to the detection sensor (20). The driving unit (30) is also used to stop driving the projection disc (10) to rotate when a stop signal is received and the detection sensor (20) detects the position of the corresponding pattern area (11).

2. The projection lamp according to claim 1, wherein The projection lamp further comprises a laser generator (40), and the laser generator (40) is used to illuminate the projection pattern in the pattern area (11); when the projection disc (10) stops rotating, the detection sensor (20) and the laser generator (40) correspond to the same pattern area (11).

3. The projection lamp according to claim 2, wherein: The pattern area (11) is fan-shaped, the detection structure (12) is located on the center line of the pattern area (11), and when the projection disc (10) stops rotating, on the top projection surface of the projection disc (10), the detection position of the detection sensor (20) and the laser emission position of the laser generator (40) are both located on the center line of the pattern area (11).

4. The projection lamp according to claim 1, wherein The projection disk (10) comprises an annular wheel (13) and a circular diffraction optical plate (14); the diffraction optical plate (14) is fixedly mounted on the annular wheel (13); the diffraction optical plate (14) comprises a plurality of pattern areas (11); a plurality of detection structures (12) are distributed on the annular wheel (13) or the diffraction optical plate (14); and the driving unit (30) drives the annular wheel (13) to rotate.

5. The projection lamp according to claim 4, wherein: The annular wheel (13) includes an annular carrier plate (131) and a plurality of positioning structures (132) distributed around the annular carrier plate (131). The periphery of the diffraction optical plate (14) is mounted on the annular carrier plate (131). The circumference of the diffraction optical plate (14) has a plurality of positioning grooves, and the plurality of positioning grooves and the plurality of positioning structures (132) are matched in a one-to-one correspondence.

6. The projection lamp according to claim 5, wherein: The positioning structure (132) includes two positioning ribs, and the two positioning ribs are respectively limitedly engaged with two opposite side walls of the positioning groove. A detection structure (12) is provided between the two positioning ribs of each positioning structure (132).

7. The projection lamp according to claim 5, wherein The annular wheel (13) further comprises an outer gear ring (133), the outer gear ring (133) being arranged around the outer circumference of the annular bearing plate (131), and the driving portion (30) being engaged with the outer gear ring (133).

8. The projection lamp according to claim 1, wherein The detection sensor (20) is an infrared pair tube, comprising a transmitting tube (21) and a receiving tube (22) arranged opposite to each other, wherein the transmitting tube (21) and the receiving tube (22) are respectively located on opposite sides of the projection disk (10); The detection structure (12) is a through hole (121) provided on the projection disk (10); in the circumferential direction of the projection disk (10), a solid structure is provided between two adjacent through holes (121); when the through holes (121) correspond to the receiving tube (22), the receiving tube (22) receives the infrared rays emitted by the transmitting tube (21), thereby detecting the position of the pattern area (11) corresponding to the through hole (121); Alternatively, the detection structure (12) is a solid block arranged on the projection disk (10), and a cavity is formed between two adjacent solid blocks in the circumferential direction of the projection disk (10). When the solid block corresponds to the receiving tube (22), the receiving tube (22) cannot receive the infrared rays emitted by the transmitting tube (21), thereby detecting the position of the pattern area (11) corresponding to the solid block.

9. The projection lamp according to claim 1, wherein The detection sensor (20) is a Hall switch (23), and the detection structure (12) is a magnet (122).

10. The projection lamp according to any one of claims 1 to 9, characterized in that: The projection lamp further comprises: a control board, the detection sensor (20) and the driving unit (30) are both electrically connected to the control board, and the control board is used to receive the detection result of the detection sensor (20) and control the driving unit (30) to stop running; A bracket (50) is provided, and the projection disc (10), the detection sensor (20) and the driving unit (30) are all installed on the bracket (50).

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