Projection equipment

Abstract

The utility model discloses a projection device, comprising a projection assembly comprising a housing, a lamp body member, a light condensation member, a projection screen and a lens group; the lamp body part is accommodated in the shell; the light gathering part is arranged around the lamp body part, the light gathering part comprises an upper opening and light reflecting plates forming the upper opening, the light reflecting plates are defined as two first light reflecting plates and two second light reflecting plates, and the gradient of the light reflecting surface of each second light reflecting plate is larger than or equal to that of the light reflecting surface of the corresponding first light reflecting plate; the projection screen is located above the light condensing part, the length of the projection screen is defined as L, the distance between the projection screen and the lamp body part is defined as D, and when the included angle between the two first light reflecting plates ranges from 30 degrees to 100 degrees, D ranges from 0.27 L to 2L, and the light path area of the light condensing part is equal to or larger than the projection area of the projection screen; the projection screen projects outwards, the lighting effect of the lamp body part is fully utilized, and meanwhile the illumination uniformity and the use temperature meet the requirements of the projection screen.

Description

[Technical Field]

[0001] This utility model relates to the technical field of projection equipment, and in particular to an ambient projection device. [Background Technology]

[0002] An existing projection device includes a light source, a circular condenser lens or diffuse reflector, a backlight collimating Fresnel lens, a heat-insulating glass unit, a liquid crystal display screen, a reflective glass, an imaging lens, a cooling fan, a mounting plate, and a housing. The imaging Fresnel lens is fastened to the mounting plate, which is screwed to the bottom of the housing. The housing contains a reflective glass at an angle to the imaging Fresnel lens, and the housing also contains an imaging lens.

[0003] Because the circular lens in the above structure forms a circular light spot, but the liquid crystal display screen is square, the display screen can only utilize the light flux corresponding to its own area, while excessively losing the rest of the light flux; or the light flux and light uniformity requirements are met by using a diffuse reflection cup, a backlight collimating Fresnel lens and a heat-insulating glass unit, which results in large light loss, complex structure and high cost. In addition, the included angle of the diffuse reflection cup and the distance between the light source and the display screen are difficult to control, which makes it impossible to ensure light utilization, light uniformity and the temperature of the display screen.

[0004] Therefore, a new projection device needs to be designed to overcome the above problems. [Utility Model Content]

[0005] In response to the problems faced by the prior art, this utility model provides a black and white screen ambient projection that efficiently utilizes the lamp body.

[0006] To achieve the above objectives, the present invention employs the following technical means:

[0007] A projection device includes: a projection assembly comprising a housing, a lamp body, a focusing element, a projection screen, and a lens assembly; the housing includes a cavity; the lamp body is housed within the cavity; the focusing element is disposed around the lamp body, the focusing element including an upper opening and a plurality of reflectors constituting the upper opening, the plurality of reflectors being defined as two opposing first reflectors and two opposing second reflectors, the inclination angle of the reflective surface of the second reflectors being greater than or equal to the inclination angle of the reflective surface of the first reflectors; and the projection screen being located at... Above the light-focusing element, the length of the projection screen is defined as L, and the distance between the projection screen and the lamp body is defined as D. When the included angle between the two first reflectors is between 30° and 100°, D = 0.27L to 2L. The light path area of ​​the light-focusing element is equal to or greater than the projection area of ​​the projection screen. The lens group is located above the projection screen and installed in the housing. The light-focusing element refracts or reflects at least a portion of the light from the lamp body. The projection screen projects lyrics, patterns, or light effects onto the screen surface, wall, ceiling, or tabletop.

[0008] Furthermore, when the included angle between the two first reflectors is between 40° and 100°, the relationship between L and D satisfies D = 0.27L to 1.5L, the luminous flux utilization rate of the focusing element is 40% to 94%, and the illumination uniformity X = 1.1 to 4.3.

[0009] Furthermore, the reflective surface is configured as an arc-shaped surface, which extends obliquely from bottom to top. The angle formed by the tangent of the arc-shaped surface of the first reflector and the central axis of the light-concentrating element is greater than the angle formed by the tangent of the arc-shaped surface of the second reflector and the central axis of the light-concentrating element.

[0010] Furthermore, the angle between the tangent of the arcuate surface of the first reflector and the central axis of the light-concentrating element gradually decreases.

[0011] Furthermore, the projection device further includes a base and a projection component mounted on the base. The projection component is movably connected to the base and, with the base as a base point, swings up and / or down or left and / or right to move the light effect of the projection component to the center light effect or the peripheral light effect of the projection component.

[0012] Furthermore, the lens assembly includes a positioning ring and an imaging lens mounted on the positioning ring. The internal thread of the positioning ring engages with the external thread of the imaging lens to focus the lens assembly. The positioning ring is fixedly connected to the housing. Alternatively, the positioning ring and the imaging lens engage with a guide groove and a sliding post to achieve focusing. The positioning ring is fixedly connected to the housing.

[0013] A projection device includes: a housing including a cavity; a lamp body housed within the cavity; and a focusing element disposed around the lamp body to refract or reflect at least a portion of the light from the lamp body. The focusing element includes an upper opening and a plurality of reflectors constituting the upper opening. The plurality of reflectors are defined as two opposing first reflectors and two opposing second reflectors. The angle formed by the tangent of the arcuate surface of the first reflector and the central axis of the focusing element is greater than or equal to the angle formed by the tangent of the arcuate surface of the second reflector and the central axis of the focusing element. The included angle formed by the central axis of the focusing element; the projection screen, located above the focusing element, is defined as having a length of L and a distance of D between the projection screen and the lamp body. When the included angle α between the two first reflectors is between 30° and 100°, the light utilization rate is 35% to 94%, the illumination uniformity is X = 1.04 to 4.5, and D = 0.27L to 2L; the lens group, located above the projection screen, projects lyrics, patterns, or light effects outwards.

[0014] Furthermore, when the included angle α between the two first reflectors is 50° to 90°, the relationship between L and D satisfies D = 0.35L to 1L, the luminous flux utilization rate of the focusing element is 54% to 88%, and the illumination uniformity X = 1.04 to 4.

[0015] Furthermore, the reflective surface of the reflector is an arc-shaped surface, which extends obliquely from bottom to top, wherein the angle of inclination of the arc-shaped surface of the first reflector is greater than or equal to the angle of inclination of the arc-shaped surface of the second reflector.

[0016] Furthermore, the projection device further includes a base and a projection component mounted on the base. The projection component is mounted on the base. The projection module includes a light source and at least one optical element located above the light source. The optical element is configured as a projection mask, an interference sheet, a corrugated sheet, a pattern sheet, or a beam splitter. When the projection component projects upward, and at least part of the residual light falls onto the wall, the lyrics, patterns, or text presented by the projection component can be seen through the light effect formed by the projection component; or the projection component projects in a horizontal direction, and the strong light effect or weak light effect of the projection component is set around the light effect of the projection component.

[0017] Furthermore, the light-concentrating element includes a plurality of limiting blocks arranged around the upper opening, the plurality of limiting blocks restricting the projection screen from shifting in the horizontal direction, and the pressure block of the housing restricting the projection screen from moving upward; or the projection screen is fixed to the upper opening of the light-concentrating element or the projection screen is fixed to the housing by adhesive.

[0018] Compared with the prior art, the projection device of this utility model has the following beneficial effects:

[0019] The projection assembly includes a housing, a lamp body, a focusing element, a projection screen, and a lens assembly. The lamp body is housed within the housing. The focusing element surrounds the lamp body and includes an upper opening and multiple reflectors constituting the upper opening. The multiple reflectors are defined as two opposing first reflectors and two opposing second reflectors, with the inclination of the reflective surface of the second reflectors being greater than or equal to the inclination of the reflective surface of the first reflectors. The projection screen is located above the focusing element, with its length defined as L and the distance between the projection screen and the lamp body as D. When the angle between the two first reflectors is between 30° and 100°, D = 0.27L to 2L. The light path area of ​​the focusing element is equal to or greater than the projection area of ​​the projection screen. The focusing element refracts or reflects at least a portion of the light from the lamp body. The projection screen projects lyrics, patterns, or light effects onto a screen surface, wall, ceiling, or tabletop, fully utilizing the light effect of the lamp body while ensuring that the uniformity of illumination and operating temperature meet the requirements of the projection screen, thus extending its lifespan. [Attached Image Description]

[0020] Figure 1 This is a perspective view of the projection device of this utility model;

[0021] Figure 2 for Figure 1 3D exploded view;

[0022] Figure 3 for Figure 2 A 3D view of the projection component;

[0023] Figure 4 for Figure 3 Top view;

[0024] Figure 5 for Figure 4 A sectional view taken along line AA;

[0025] Figure 6 for Figure 3 3D exploded view;

[0026] Figure 7 for Figure 6 Exploded three-dimensional view of the central lamp body and the focusing element;

[0027] Figure 8 This is an exploded perspective view of the lamp body and focusing element according to another embodiment; Explanation of reference numerals in the accompanying drawings for specific embodiments:

[0028] 100 projection devices Base 1 Containment cavity 11 Guide groove 112 Projection hole 113 Projection component 2 Light source 21 Optical element 22 Driver Component 23 Optical devices 24 Projection Component 3 Casing 31 Containment space 311 Pivot 312 Positioning pin 313 Positioning hole 314 315 Buckle part 316 317 Press Block Damping component 318 Lamp body 32 Concentrator 33 Lower opening 331 Top opening 332 First reflector 333 Second reflector 334 Reflective surface 335 Limit block 336 Leaving slot 337 Chamfered curved surface 338 Positioning shell 399 Reflector 340 Projection screen 34 Imaging lens 35 Positioning ring 351 Lens Group 352

Detailed Implementation Methods

[0029] To facilitate a better understanding of the purpose, structure, features, and effects of this utility model, the present utility model will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0030] like Figures 1 to 8 As shown, the projection device 100 of this utility model includes a base 1, a projection component 2 and a projection assembly 3 mounted on the base 1. The projection direction of the projection component 2 forms an angle θ with the projection direction of the projection assembly 3, where 0°≤θ≤180°, preferably 0° to 120°. The projection component 2 and the projection assembly 3 can be operated simultaneously or one of them can operate independently.

[0031] like Figure 1 and Figure 2 As shown, the base 1 includes a receiving cavity 1 and a guide groove 112 and a projection hole 113 that are connected to the receiving cavity 1.

[0032] like Figure 1 , Figure 2 As shown, the projection component 2 is housed in the receiving cavity 11. The projection component 2 includes a light source 21 and at least one optical element 22 located above the light source 21. The optical element 22 is configured as at least one of the following: a projection mask or convex lens or corrugated sheet, an interference sheet or beam splitter, a grating sheet or reflector or projection sheet. The light source 21 is at least one LED or laser, selected from monochromatic or multicolor, multi-chip, standard or special LEDs or lasers. The projection component 2 also includes a driving assembly 23, which drives the light source 21 and / or the optical element 22 to rotate. The light source 21 or the optical element 22 is configured to rotate at a constant speed or variable speed or in the forward direction and / or in the reverse direction. In this embodiment, the projection component 2 further includes an optical device 24 located above the optical element 22. The optical device 24 is configured as at least one of the following: an aurora mask with an irregularly elongated lens, a condenser mask with multiple facets, or a condenser lens. The projection component 2 projects light effects toward the ceiling, wall, or floor. These projection effects include at least one of the following: aurora, luminous patterns or animals, figures, starry skies or cartoons, signs or time displays, geometric art, natural scenes, the Milky Way, water ripples, or clouds. The projection component 2 creates a gradient light effect, with the intensity of the projection optics gradually decreasing from the center to the outer edge. The projection effect created by the projection component 2 is projected onto the ceiling, wall, or floor.

[0033] like Figure 5 , Figure 6 and Figure 7As shown, the projection component 3 is movably connected to the base 1, and swings up and down and / or left and right along the guide groove 112 with the base 1 as the base point. The overlapping position of the lyrics, font, or pattern projection formed by the projection component 3 with the light effect of the projection member 2 changes, or the lyrics, font, or pattern projection formed by the projection component 3 overlaps with different forms of light effect formed by the projection member 2. The connection structure between the projection component and the base 1 is set as a pin connection, magnetic connection, clamp connection, ball joint connection, magnetic connection, damping hinge connection, hinge connection, gear connection, universal joint connection, or connecting rod connection. The horizontal direction is defined as the starting point of the swing of the projection component 3. The projection component rotates 0° to 90° upward and / or downward and / or 0° to 90° to the left and / or right, and the projection component 3 is set to fixed focus, manual focus, or automatic focus. The base 1 is defined as a seat, or the housing of the projection component 2 is defined as a seat, or an additional connector fixedly connected to the base 1 can also be defined as a seat. The projection component 3 includes a housing 31, a lamp body 32, a focusing element 33, a projection screen 34, and an imaging lens 35 mounted on the housing 31. The lamp body 32, the focusing element 33, the projection screen 34, and the imaging lens 35 are arranged sequentially from bottom to top. The focal length of the imaging lens 35 is defined as F, and the distance between the projection screen 34 and the imaging lens 35 is between 1F and 2F. The projection component 3 includes a housing 31 and a receiving space 311 formed in the housing 31. The housing 31 includes a first shell and a second shell that are interlocked. The first shell is provided with a positioning pin 313 and a hook 315, and the second shell is provided with a positioning hole 314 and a fastening part 316. The positioning pin 313 cooperates with the positioning hole 314, and the hook 315 is fastened to the fastening part 316. Alternatively, the first housing 31 and the second housing 31 can be fixed by the hook 315 and / or positioning pin 313 or screw. The first housing or the second housing also includes an outwardly extending pivot portion 312 and a damping member 318, the damping member 318 enhancing the friction between the pivot portion 312 and the base 1. The pivot portion 312 and the damping member 318 together engage with the hole in the base 1, forming a pin-connection structure. The projection assembly 3 includes only the lamp body 32, the focusing member 33, the projection screen 34, and the imaging lens 35. The lamp body 32 dissipates heat through an aluminum substrate and / or heat dissipation holes; or the projection assembly 3 includes only the lamp body 32, the focusing member 33, a heat-insulating and light-transmitting plate, the projection screen 34, and the imaging lens 35. The lamp body 32 dissipates heat through an aluminum reflector and / or heat dissipation holes. The heat dissipation substrate is housed in the housing 31 and adheres to the lamp body 32.The focusing element 33 includes a lower opening 331 and an upper opening 332 that are interconnected, the upper opening 332 being larger than the lower opening 331, and the lower opening 331 surrounding the lamp body 32. The focusing element 33 includes at least one reflector constituting the upper opening 332 and the lower opening 331, the inner surface of which forms a reflective surface 335, which is composed of a reflective film or reflective sheet. Alternatively, the focusing element 33 includes a positioning shell 3398 and a reflector 340 mounted on the positioning shell 3398, with multiple reflectors facing the lamp body (see [reference]). Figure 8The positioning shell 3398 and the reflector 340 are formed independently or integrally. When integrally formed, the reflective film is formed. In this embodiment, the light-concentrating element 33 includes two first reflectors 333 and two second reflectors 334 that are arranged opposite to each other, constituting the upper opening 332 and the lower opening 331. The surfaces of the first reflectors 333 and the second reflectors 334 are provided with reflective films or reflective sheets, forming the reflective surface 335. The reflective surface 335 is an arc-shaped surface with a gradually changing inclination curvature. The arc-shaped surface extends obliquely from bottom to top, that is, the reflectors gradually move away from the central axis of the light-concentrating element 33 from bottom to top. The inclination of the arcuate surface of the second reflector 334 is greater than or equal to the inclination of the arcuate surface of the first reflector 333, or the angle formed by the tangent of the arcuate surface of the first reflector 333 and the central axis of the focusing element 33 is greater than or equal to the angle formed by the tangent of the arcuate surface of the second reflector 334 and the central axis of the focusing element 33. The arcuate surfaces of the first reflector 333 and the second reflector 334 are connected by a chamfered arcuate surface 338. The angle formed by the tangent of the arcuate surface of the first reflector 333 and / or the second reflector 334 and the central axis of the focusing element gradually decreases. At least part of the light beam emitted by the lamp body 32 passes through the projection screen 34 and the imaging lens 35 after its optical path is changed by the reflective film, the reflector sheet, or the reflector cover 340. The light-emitting area of ​​the lamp body 32 is greater than or equal to the projection area of ​​the projection screen 34. The focusing element also includes multiple limiting blocks 336 and clearance grooves 337 arranged around the opening. The multiple limiting blocks 336 restrict the projection screen 34 from shifting horizontally, and the pressing block 317 of the housing 31 restricts the projection screen 34 from moving upward; or the upper opening 332 of the projection screen 34 is fixed to the focusing element or the projection screen 34 is fixed to the housing 31 by adhesive. The limiting groove 337 is located on one side of the limiting block 336, facilitating the electrical connection between the conductive wire and the projection screen 34. The imaging lens group 36 includes a positioning ring 351 and a lens group 352. The internal thread of the positioning ring 351 engages with the external thread of the lens group 352 for focusing the imaging lens 35. Alternatively, the positioning ring 351 and the lens group 352 engage through a guide groove and a sliding post to achieve focusing. The positioning ring 351 is fixedly connected to the housing 31.

[0034] like Figure 5As shown, the length of the projection screen 34 is defined as L, the distance between the projection screen 34 and the lamp body is defined as D, and the included angle α between the two first reflectors 333 is greater than or equal to the included angle β between the two first reflectors 333. In the existing structure, the closer the lamp body 32 is to the projection screen 34, the higher the light utilization rate and the worse the illumination uniformity X. However, after adding the focusing element 33 between the light source 21 and the projection screen 34, the following data was obtained through multiple research and development experiments: as the lamp body 32 gets closer to the projection screen 34, the illumination uniformity gradually becomes more uniform. In addition, because the larger the included angle α is, the higher the lamp body lumen value and the higher the light utilization rate, but the more heat the lamp body 32 generates, it is easy for the temperature to exceed the temperature that the projection screen 34 can withstand, causing the projection screen 34 to turn blue or its non-projection area to have higher light transmittance, thus affecting the projection effect. Therefore, it is necessary to determine the range of values ​​for the included angle α through multiple research and development experiments. According to the test data, an illumination uniformity X less than 3 is considered uniform, and the closer it is to 1, the more uniform it is. When α = 20°, the light utilization rate is 25%–35%, the illumination uniformity X = 1.05–1.35, and D = 2L–3L; when α = 30°, the light utilization rate is 35%–44%, the illumination uniformity X = 3.5–4.5, and D = 1.2L–2L; when α = 40°, the light utilization rate is 45%–53%, the illumination uniformity X = 3.2–4.3, and D = 1L–1.5L; when α = 50°, the light utilization rate is 54%–60%, the illumination uniformity X = 2.6–4, and D = 0.8L–1L; when α = 60°, the light utilization rate is 61%–71%, the illumination uniformity X = 1.5–3, and D = 0.6L–0.8L; when α = 70°, the light utilization rate is… The light utilization rate is 66%–73%, the light uniformity X = 1.4–2.8, and D = 0.5L–0.65L; when α = 80°, the light utilization rate is 70%–77%, the light uniformity X = 1.2–1.6, and D = 0.43L–0.5L; when α = 90°, the light utilization rate is 80%–88%, the light uniformity X = 1.04–1.3, and D = 0.35L–0.43L; when α = 100°, the light utilization rate is 83%–94%, the light uniformity X = 1.1–1.5, and D = 0.29L–0.35L; when α = 110°, the light utilization rate is 88%–96%, the light uniformity X = 2–3, and D = 0.23L–0.3L. When the included angle α between the two first reflectors 333 is between 30° and 100°, the light utilization rate is 35% to 94%, X = 1.04 to 4.5, and D = 0.27L to 2L. When the included angle α between the two oppositely arranged first reflectors is between 40° and 90°, the relationship between L and D satisfies D = 0.35L to 1.5L, the light flux utilization rate of the focusing element is 45% to 88%, and the illumination uniformity X = 1.04 to 4.3.When the included angle α between the two first reflectors 333 is between 40° and 100°, the relationship between L and D satisfies D = 0.27L to 1.5L, the luminous flux utilization rate of the focusing element is 40% to 94%, and the illumination uniformity X = 1.1 to 4.3. When the included angle α between the two first reflectors 333 is between 50° and 90°, the relationship between L and D satisfies D = 0.35L to 1L, the luminous flux utilization rate of the focusing element is 54% to 88%, and the illumination uniformity X = 1.04 to 4. The projection light effect of the projection component 2 constitutes the atmospheric effect of the projection assembly 3. The projection assembly 3 at least forms lyrics, fonts, or pattern projections. The projection screen 34 is a black and white screen that projects lyrics onto a wall, floor, film, or tabletop. When the projection screen 34 receives the lyrics information transmitted from the motherboard, it illuminates the corresponding liquid crystal to form the lyrics projection. As the lyrics projection of the projection component 3 changes, the projection member 2 automatically or manually projects red, blue, green, or any combination of these three colors, or a rhythmic light effect, or a changing projection pattern. A speaker mounted on the base 1 receives audio files transmitted from the motherboard and plays sound. When a song is at a high pitch, the rotation speed of the first projection member 2 gradually increases or displays a rhythmic light effect; when a song progresses to a low pitch, the rotation speed of the first projection member gradually decreases or remains constant. The lyrics projected by the projection component 3 fall onto a wall, screen, or floor. The projection light effect of the projection member 2 surrounds the lyrics or allows the lyrics to be observed through the light effect formed by the projection member 2. When the projection device 100 is connected to a microphone, karaoke can be performed. The projection member 2 includes a central strong light effect and a weak light effect surrounding the strong light effect. The lyrics, fonts, or pattern projection can be observed through the central optics and / or outer edge optics of the projection member 2. When the projection component 2 projects upwards, and the projection assembly 3 projects horizontally, the light effect projected by the projection assembly 3 can be seen through the weak light effect formed by the projection component 2; or when the projection component 2 projects horizontally, the strong light effect or weak light effect of the projection assembly 3 is set around the light effect of the projection assembly 3.

[0035] In summary, the projection device of this utility model has the following beneficial effects:

[0036] (1) The projection assembly 3 includes a housing 31, a lamp body 32, a focusing element 33, a projection screen 34, and a lens assembly 35; the lamp body 32 is housed in the housing 31; the focusing element 33 is arranged around the lamp body 32, and the focusing element 33 includes a lower opening 333 and multiple reflectors constituting the upper opening 332, the multiple reflectors being defined as two first reflectors 333 and two second reflectors 334 arranged opposite each other, the inclination of the reflective surface of the second reflector 334 being greater than or equal to the inclination of the reflective surface 335 of the first reflector 333; the projection screen is located on the focusing element 33. Above, the length of the projection screen 35 is defined as L, and the distance between the projection screen 35 and the lamp body is defined as D. When the included angle between the two first reflectors 333 is between 30° and 100°, D = 0.27L to 2L. The light path area of ​​the focusing element 33 is equal to or greater than the projection area of ​​the projection screen 33. The focusing element 33 refracts or reflects at least part of the light from the lamp body 32. The projection screen 33 projects lyrics, patterns, or light effects onto the screen surface, wall, ceiling, or tabletop, making full use of the light effect of the lamp body. At the same time, the uniformity of illumination and the operating temperature meet the requirements of the projection screen, thereby improving the lifespan of the projection screen.

[0037] (2) The projection light effect of the projection component 2 surrounds the lyrics or the lyrics subtitles can be observed through the light effect formed by the projection component 2. When the projection device 100 is connected to a microphone, karaoke can be performed. The atmosphere is very strong and the implementation cost is low.

[0038] (3) Define the horizontal direction as the starting point for the swing of the projection component 3. The projection component rotates 0° to 90° upward and / or downward and / or rotates 0° to 90° to the left and / or right. The projection component 3 is set to fixed focus, manual focus or automatic focus. The projection position of the lyrics can be changed at any time according to the needs. The product is not limited by the projection position.

[0039] (4) The lamp body 32, the focusing element 33, the projection screen 34, and the imaging lens 35, wherein the lamp body 32 dissipates heat through an aluminum reflector and / or heat dissipation holes; or the projection assembly 3 includes only the lamp body 32, the focusing element 33, the heat-insulating and light-transmitting plate, the projection screen 34, and the imaging lens 35, wherein the lamp body 32 dissipates heat through an aluminum substrate and / or heat dissipation holes.

[0040] The above detailed description is only a description of the preferred embodiment of this utility model and is not intended to limit the patent scope of this utility model. Therefore, all equivalent technical changes made using the content of this invention's specification and illustrations are included within the patent scope of this invention.

Claims

1. A projection device, characterized in that, include: Projection components, including housing, lamp body, focusing element, projection screen, and lens assembly; The housing includes a cavity; The lamp body is housed within the cavity; The focusing element is arranged around the lamp body. The focusing element includes an upper opening and a plurality of reflectors constituting the upper opening. The plurality of reflectors are defined as two first reflectors and two second reflectors arranged opposite each other. The inclination of the reflective surface of the second reflector is greater than or equal to the inclination of the reflective surface of the first reflector. The projection screen is located above the light-concentrating element. The length of the projection screen is defined as L, and the distance between the projection screen and the lamp body is defined as D. When the included angle between the two first reflectors is between 30° and 100°, D = 0.27L to 2L. The optical path area of ​​the light-concentrating element is equal to or greater than the projection area of ​​the projection screen. The lens assembly is located above the projection screen and mounted on the housing, and the light-concentrating element refracts or reflects at least a portion of the light from the lamp body: The projection screen projects lyrics, patterns, or light effects onto the screen surface, wall, ceiling, or desktop.

2. The projection device as described in claim 1, characterized in that: When the angle between the two first reflectors is between 40° and 100°, the relationship between L and D satisfies D = 0.27L to 1.5L, the luminous flux utilization rate of the focusing element is 40% to 94%, and the illumination uniformity X = 1.1 to 4.

3.

3. The projection device as described in claim 2, characterized in that: The reflective surface is configured as an arc-shaped surface, which extends obliquely from bottom to top. The angle formed by the tangent of the arc-shaped surface of the first reflector and the central axis of the light-concentrating element is greater than the angle formed by the tangent of the arc-shaped surface of the second reflector and the central axis of the light-concentrating element.

4. The projection device as described in claim 3, characterized in that: The angle between the tangent of the arc-shaped surface of the first reflector and the central axis of the light-concentrating element gradually decreases.

5. The projection device as described in any one of claims 1-4, characterized in that: The projection device further includes a base and a projection component mounted on the base. The projection component is movably connected to the base and, with the base as a base, swings up and / or down or left and / or right to move the light effect of the projection component to the center light effect or the peripheral light effect of the projection component.

6. The projection device as described in any one of claims 1-4, characterized in that: The lens assembly includes a positioning ring and an imaging lens mounted on the positioning ring. The internal thread of the positioning ring engages with the external thread of the imaging lens to focus the lens assembly. The positioning ring is fixedly connected to the housing. Alternatively, the positioning ring and the imaging lens engage with a guide groove and a sliding post to achieve focusing. The positioning ring is fixedly connected to the housing.

7. A projection device, characterized in that, include: The housing, including the cavity; The lamp body is housed within the cavity; A focusing element, arranged around the lamp body, refracts or reflects at least a portion of the light from the lamp body. The focusing element includes an upper opening and a plurality of reflectors constituting the upper opening. The plurality of reflectors are defined as two first reflectors and two second reflectors arranged opposite each other. The angle formed by the tangent of the arcuate surface of the first reflector and the central axis of the focusing element is greater than or equal to the angle formed by the tangent of the arcuate surface of the second reflector and the central axis of the focusing element. A projection screen is located above the light-concentrating element. The length of the projection screen is defined as L, and the distance between the projection screen and the lamp body is defined as D. When the included angle α between the two first reflectors is between 30° and 100°, the light utilization rate is 35% to 94%, the light uniformity is X = 1.04 to 4.5, and D = 0.27L to 2L. The lens assembly is located above the projection screen: The projection screen projects lyrics, patterns, or light effects outwards.

8. The projection device as described in claim 7, characterized in that: When the included angle α between the two first reflectors is 50° to 90°, the relationship between L and D satisfies D = 0.35L to 1L, the luminous flux utilization rate of the focusing element is 54% to 88%, and the illumination uniformity X = 1.04 to 4.

9. The projection device as described in claim 7 or 8, characterized in that: The reflective surface of the reflector is an arc-shaped surface that extends obliquely from bottom to top. The angle of inclination of the arc-shaped surface of the first reflector is greater than or equal to the angle of inclination of the arc-shaped surface of the second reflector.

10. The projection device as described in claim 7 or 8, characterized in that: The projection device further includes a base, a projection component and a projection assembly mounted on the base. The projection component includes a light source and at least one optical element located above the light source. The optical element is configured as a projection mask, an interference sheet, a corrugated sheet, a pattern sheet, or a beam splitter. When the projection component projects upwards, and at least part of the residual light falls onto the wall, the lyrics, patterns, or text presented by the projection assembly can be seen through the light effect formed by the projection component; or the projection component projects in a horizontal direction, and the strong light effect or weak light effect of the projection component is set around the light effect of the projection assembly.

11. The projection device as described in claim 7 or 8, characterized in that: The light-concentrating element includes a plurality of limiting blocks arranged around the upper opening, the plurality of limiting blocks restricting the projection screen from shifting in the horizontal direction, and the pressure block of the housing restricting the projection screen from moving upward; or the projection screen is fixed to the upper opening of the light-concentrating element or the projection screen is fixed to the housing by adhesive.

Images